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Sierra Oncology, Inc.

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FY2020 Annual Report · Sierra Oncology, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

☒

☐

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2020

OR

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM                      TO                     
Commission File Number: 001-37490

Sierra Oncology, Inc.

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of
incorporation or organization)
1820 Gateway Drive, Suite 110
San Mateo, California
(Address of principal executive offices)

20-0138994
(I.R.S. Employer
Identification Number)

94404
(Zip Code)

(650) 376-8679
(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, $0.001 par value

Trading Symbol(s)
SRRA
Securities registered pursuant to Section 12(g) of the Act: None

Name of each exchange on which registered
The Nasdaq Global Market

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    YES  ☐    NO   ☒
Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.     YES  ☐    NO  ☒
Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for
such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  ☒   NO  ☐ 
Indicate by check mark whether the Registrant has submitted electronically, if any, every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this
chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files).    YES  ☒    NO  ☐ 
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the
definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer

Non-accelerated filer

☐
☒  

Accelerated filer

Smaller reporting company

Emerging growth company

☐

☒

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting
standards provided pursuant to Section 13(a) of the Exchange Act.   ☐
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section
404(b) of the Sarbanes-Oxley Act (15 U.S.C.  7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐
Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    YES  ☐    NO  ☒
The aggregate market value of common stock held by non-affiliates of the registrant calculated based on the closing price of $12.10 of the registrant’s common stock as reported on The Nasdaq
Global Market on June 30, 2020, the last business day of the registrant’s most recently completed second quarter, was $56.1 million.
The number of shares of Registrant’s Common Stock outstanding as of March 8, 2021 was 11,628,479.

DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s Definitive Proxy Statement (“Proxy Statement”) relating to the 2021 Annual Meeting of Stockholders will be filed with the Commission within 120 days after the end
of the Registrant’s 2020 fiscal year and is incorporated by reference into Part III of this Report.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TABLE OF CONTENTS

Business
Risk Factors
Unresolved Staff Comments
Properties
Legal Proceedings
Mine Safety Disclosures

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Selected Consolidated Financial Data
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures About Market Risk
Consolidated Financial Statements and Supplementary Data
Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accounting Fees and Services

Exhibits, Consolidated Financial Statement Schedules
Form 10-K Summary
Signatures

PART I

Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.

PART II
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.

PART III

Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

PART IV

Item 15.
Item 16.

Page

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31
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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K (Annual Report) contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act
of 1934, as amended (Exchange Act), and section 27A of the Securities Act of 1933, as amended (Securities Act). All statements contained in this Annual
Report other than statements of historical fact, including statements regarding our future clinical development activities, expected timing and results of
clinical trials, future results of operations and financial position, our business strategy and plans and our objectives for future operations, are forward-
looking statements. The words “believe,” “may,” “will,” “potentially,” “estimate,” “continue,” “anticipate,” “intend,” “could,” “would,” “project,” “plan,”
“expect,” and similar expressions that convey uncertainty of future events or outcomes are intended to identify forward-looking statements.

We have based these forward-looking statements largely on our current expectations and projections about future events and trends that we believe may
affect our financial condition, results of operations, business strategy, short-term and long-term business operations and objectives and financial needs.
These forward-looking statements are subject to a number of risks, uncertainties and assumptions, including those described in Item 1A, “Risk Factors” and
elsewhere in this Annual Report. Moreover, we operate in a very competitive and rapidly changing environment, and new risks emerge from time to time. It
is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or
combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. In light of these
risks, uncertainties, and assumptions, the forward-looking events and circumstances discussed in this Annual Report may not occur and actual results could
differ materially and adversely from those anticipated or implied in the forward-looking statements.

You should not rely upon forward-looking statements as predictions of future events. Although we believe that the expectations reflected in the forward-
looking statements are reasonable, we cannot guarantee that the future results, levels of activity, performance or events and circumstances reflected in the
forward-looking statements will be achieved or occur. We undertake no obligation to update publicly any forward-looking statements to conform these
statements to actual results or to changes in our expectations, except as required by law. You should read this Annual Report with the understanding that
our actual future results, levels of activity, performance and events and circumstances may be materially different from what we expect.

Unless the context indicates otherwise, as used in this Annual Report, the terms “Sierra Oncology,” “the Company,” “we,” “us” and “our” refer to Sierra
Oncology, Inc., a Delaware corporation, and its subsidiaries taken as a whole, unless otherwise noted. Sierra Oncology is our registered trademark. The
“Sierra Oncology” logo and all product names are our common law trademarks. This Annual Report contains additional trade names, trademarks and
service marks of other companies, which are the property of their respective owners. We do not intend our use or display of other companies’ trade names,
trademarks or service marks to imply a relationship with, or endorsement or sponsorship of us by, these other companies.

2

 
 
Item  1.

Business.

Overview

PART I

We are a late-stage biopharmaceutical company on a quest to deliver targeted therapies that treat rare forms of cancer. Our main focus is the development
of momelotinib, an investigational agent for the treatment of myelofibrosis. Currently, momelotinib is in a global Phase 3 clinical trial for patients with
myelofibrosis, called the MOMENTUM study, that if successful will be registration enabling. At its completion, approximately 1,000 myelofibrosis
patients will have received momelotinib, and several of our clinical trial patients remain on treatment more than 10 years later.

In the third quarter of 2018, we acquired momelotinib from Gilead Sciences, Inc. (Gilead), which had completed several late-stage trials of the drug
candidate in patients with myelofibrosis. Myelofibrosis is characterized by progressive anemia and thrombocytopenia and currently approved JAK inhibitor
therapies, ruxolitinib and fedratinib, can induce or further exacerbate this myelosuppression, limiting their use in first line treatment and resulting in a
population of second line patients who are no longer able to benefit from such therapies. Momelotinib is a novel, orally-bioavailable JAK1 (Janus kinase
1), JAK2 (Janus kinase 2) and ACVR1 (Activin A receptor type 1) inhibitor with a differentiated mechanism of action, enabling it to potentially address all
three hallmarks of disease in myelofibrosis: anemia of inflammation, constitutional symptoms and enlarged spleen.

In December 2018, we reported new data for momelotinib collated from the two completed SIMPLIFY Phase 3 clinical trials and a translational biology
study in transfusion dependent patients with myelofibrosis. Data from the latter study were also concurrently presented in a poster at the 60th American
Society of Hematology Annual Meeting & Exposition in San Diego, California. We reported aggregated transfusion independence responses from more
than 150 intermediate and high-risk transfusion dependent myelofibrosis patients demonstrating robust and consistent response rates within and across the
clinical studies. More than 44% of these patients became transfusion free for at least 12 weeks and nearly 50% were transfusion independent for at least 8
weeks.

In the second quarter of 2019, we announced that we had obtained regulatory clarity with the U.S. Food and Drug Administration (FDA) concerning the
design of a Phase 3 clinical trial intended to support potential registration of momelotinib. We also announced that the FDA had granted Fast Track
designation to momelotinib for the treatment of patients with intermediate/high-risk myelofibrosis who have previously received a JAK inhibitor.

Following receipt of this clarity, we announced the design of the MOMENTUM Phase 3 clinical trial in myelofibrosis, which we subsequently launched in
the fourth quarter of 2019. MOMENTUM is a randomized double-blind trial designed to enroll 180 myelofibrosis patients who are symptomatic and
anemic and have been treated previously with a JAK inhibitor. The Primary Endpoint of the trial is the Total Symptom Score (TSS) response rate of
momelotinib compared to danazol at Week 24 (99% power; p-value < 0.05). Danazol has been selected as an appropriate treatment comparator given its
use to ameliorate anemia in myelofibrosis patients, as recommended by National Comprehensive Cancer Network (NCCN) and European Society for
Medical Oncology (ESMO) guidelines. Patients are being randomized 2:1 to receive either momelotinib or danazol. After 24 weeks of treatment, patients
on danazol are being allowed to crossover to receive momelotinib.

During the fourth quarter of 2019, we reported new analyses of red blood cell (RBC) transfusion data from SIMPLIFY-1, a double-blind Phase 3 trial of
momelotinib head-to-head versus ruxolitinib in JAK inhibitor-naïve patients, which were presented in a poster by Dr. Ruben Mesa, Director of the Mays
Cancer Center, home to UT Health San Antonio MD Anderson Cancer Center, at the 61st American Society of Hematology (ASH) Annual Meeting in
Orlando, Florida. These analyses demonstrated that patients who received momelotinib had significantly decreased transfusion requirements compared to
those treated with ruxolitinib, including an odds ratio of nearly 10 for receiving no transfusions during the 24-week study period. Transfusion dependency
and moderate to severe anemia are critical negative prognostic factors for overall survival in myelofibrosis.

3

During the second quarter of 2020, at the 25th European Hematology Association (EHA) Virtual Congress, we reported favorable Long-Term Safety and
Dose Intensity data for momelotinib from more than 550 patients across the two previously conducted SIMPLIFY Phase 3 studies and their subsequent
ongoing extended treatment periods. More than 90 SIMPLIFY-1 and SIMPLIFY-2 patients continued to receive momelotinib for 3.5 years or longer. These
data were presented in posters by Professor Claire Harrison, Guy's and St. Thomas' NHS Foundation Trust, London, United Kingdom, and Dr. Vikas Gupta,
Princess Margaret Cancer Centre, Toronto, Canada. The key findings were:

•

•

•

Consistent with prior data, and reflecting momelotinib's differentiated pharmacological profile, our new long-term safety analyses continue to
show a rapid and sustained increase in hemoglobin levels during momelotinib therapy, in contrast to the significant decrease in hemoglobin for
patients receiving ruxolitinib. Patients treated with momelotinib also experienced significantly higher mean platelet counts compared to those
receiving ruxolitinib. Importantly, patients who switched from ruxolitinib to momelotinib also achieved a sustained improvement in
hemoglobin in both studies, and platelets in SIMPLIFY-1. In addition to an absence of significant rates of high-grade hematological toxicities,
long-term tolerability was favorable with no new safety signals or evidence of cumulative toxicity.

Momelotinib's safety profile and durable benefits facilitated sustained dose intensity across the continuum of JAK inhibitor-naïve and
previously JAK inhibitor treated myelofibrosis patients. While the starting doses for ruxolitinib were often attenuated due to low platelets,
further reductions in dose intensity were also commonly required for ruxolitinib. In contrast, momelotinib was initiated at full dose for all
subjects enrolled to the SIMPLIFY studies and high dose intensity was maintained in the majority over extended durations. Patients who
switched from ruxolitinib to momelotinib saw an immediate and sustained improvement in dose intensity.

The data from the two interrelated presentations suggest that the favorable effect on hemoglobin and platelets allows momelotinib to be
initiated at full dose intensity and maintained for the majority of patients at full dose intensity over extended durations while retaining a
favorable long-term safety profile. Notably, some patients continued to receive momelotinib 10 years after enrolling in the initial momelotinib
Phase 2 trials while 90 Phase 3 SIMPLIFY patients who enrolled into those trials 4 to 6 years ago continued to receive momelotinib. We
believe the dosing and safety profile may contribute to momelotinib’s potential ability to provide sustained benefits over extended durations.

Most recently, we released updated analyses from the previously completed Phase 3 SIMPLIFY studies of momelotinib at the American Society of
Hematology Annual Meeting in December 2020, including overall survival data as well as efficacy data for momelotinib compared to ruxolitinib in patients
with low platelet levels. The overall survival data received an oral presentation by Dr. Srdan Verstovsek of the University of Texas MD Anderson Cancer
Center in Houston, Texas, USA; efficacy data by platelet strata were presented in a poster by Dr. Jean-Jacques Kiladjian, Saint Louis Hospital, Paris,
France. Key findings were:

•

•

Robust overall survival was observed in both JAK inhibitor-naïve and previously ruxolitinib treated patients. Sustained transfusion
independence was observed with extended momelotinib treatment, and the median duration of TI in the momelotinib arm has not been reached
after more than three years of follow up. We believe these data, in combination with previously reported safety data, further highlight where
momelotinib may be a viable treatment option for myelofibrosis patients, including those who are not ideal candidates for currently approved
therapies.

The retrospective analysis of the two Phase 3 SIMPLIFY studies demonstrate that the relative benefit-risk profile of momelotinib and
ruxolitinib is influenced by baseline platelet count. In SIMPLIFY-1, momelotinib achieved substantially higher Transfusion Independence (TI)
and splenic response rates and had a similar symptomatic response relative to ruxolitinib in patients whose platelet count at baseline was <150
x 109/L. For patients whose platelet count was 150 – 300 x 109/L, momelotinib achieved a higher TI response rate and generally similar splenic
and symptom response rates. In patients with platelet counts >300 x 109/L, ruxolitinib achieved higher splenic and symptom response rates
than momelotinib, and the TI rate remained higher with momelotinib. These updated analyses complement previous findings that demonstrate
the ability to initiate and maintain near-maximal momelotinib dose intensity regardless of baseline platelet count, suggesting that this durable
dosing contributes to its efficacy profile.

4

 
 
 
 
 
During 2020, we continued to operationalize the MOMENTUM trial on a global basis, and we anticipate closing screening in the first half of 2021 and
remain on track to complete enrollment in mid-2021. Top-line data are currently anticipated in the first half of 2022 and, if the data are positive, we
anticipate filing for regulatory approval of momelotinib in the second half of 2022. Due to the recent global outbreak of COVID-19, our clinical trials have
been and may continue to be affected, and we are likely to experience delays in anticipated timelines and milestones, which will be difficult to predict until
we have more visibility on the duration and impact of the COVID-19 pandemic and the potential institution of additional public health orders. We have
experienced and may continue to experience some delays in planned site initiations and activations and may experience future delays in overall enrollment.

We believe that our current resources will be sufficient to execute on our development strategy for momelotinib into the second half of 2022, subject to the
potential impact of COVID-19. We are also starting to explore non-dilutive options that could provide additional capital to support our North American
commercialization strategy.

Our portfolio also includes SRA737, a selective, orally bioavailable small molecule inhibitor of Checkpoint kinase 1 (Chk1), an emerging target for the
treatment of cancer which has a key role in the DNA Damage Response (DDR). In November 2020, we entered into an amendment to the License
Agreement with CRT Pioneer Fund (CPF) to allow for the potential future clinical development of SRA737.

We wholly own momelotinib, subject to future milestone payments and royalties, and retain the global commercialization rights to SRA737.

Our Lead Product Candidate – Momelotinib

Myelofibrosis

Myelofibrosis is a disorder involving the stem-cells that give rise to blood cells, and is driven by molecular abnormalities that activate the JAK-signal
transducers and activators of transcription (JAK-STAT) pathway. The Janus kinases (JAKs) play a central role in the regulation of blood cell production,
controlling survival, proliferation, and differentiation of progenitor cells as well as the function of mature cells. Abnormal activation of the JAK‑STAT
pathway is central to the development of myelofibrosis by driving proliferation, inflammation, fibrosis, and progression of disease.

The three cardinal disease manifestations of myelofibrosis are (1) progressive anemia, often in association with thrombocytopenia (deficiency of platelets
in the blood) or other cytopenias (blood cell deficiencies); (2) constitutional symptoms such as fatigue, night sweats, fever, cachexia (wasting), bone pain,
pruritus (itching), and weight loss; and (3) organ enlargement, principally of the spleen and less often the liver, due to these organs attempting to produce
blood cells, which can cause commonly associated symptoms such as abdominal distension and pain, early satiety, dyspnea (labored breathing), and
diarrhea. The median survival for all patients with myelofibrosis is about six years but is considerably worse for intermediate 2- and high-risk patients at 4
years and 2.25 years, respectively. Besides causing disease-related morbidity, myelofibrosis may result in early death from leukemic progression, which can
occur in about 20% of patients, and complications arising from progressive bone marrow failure, portal or pulmonary hypertension, infections, clotting,
bleeding, and cardiovascular complications.

Myelofibrosis is a relatively rare condition with an incidence of 0.1 to 1 per 100,000 individuals per year, and a prevalence of 6 per 100,000 person-years
because of its chronic nature and disabling course. It is estimated that 18,000 patients are living with myelofibrosis in the United States, and there are up to
40,000 patients globally. Median age at diagnosis is 67 years. Myelofibrosis may occur de novo as primary myelofibrosis (PMF) or may arise from a
preexisting myeloproliferative neoplasm (MPN), including primarily polycythemia vera (PV) or essential thrombocytosis (ET).

5

 
Importance of Anemia in Myelofibrosis

Anemia is a cardinal feature of myelofibrosis, and RBC transfusion dependence is a hallmark of the late-stage disease. Within a year of diagnosis, 45% of
patients with myelofibrosis are already RBC transfusion dependent and eventually, nearly all will develop transfusion dependence.

Transfusion dependence is a critical negative prognostic factor for survival for patients with myelofibrosis. Transfusions are associated with both acute and
chronic health risks, and they place a significant burden on both the patient and the health care system. Severe anemia and transfusion dependence are
independent predictors of poor prognosis and are inversely correlated with quality of life. Conversely, response to anemia-targeted therapies has been
associated with improvement in quality of life. The prognostic effect of anemia was recently demonstrated in 1,109 consecutive PMF patients at the Mayo
Clinic, 86% of whom presented with some degree of anemia. Even mild anemia impaired survival, while severe anemia (defined as Hgb level of < 8 g/dL
or transfusion dependence) was associated with > 1.5-fold increase in risk of death compared with moderate anemia (Hgb level of 8-10 g/dL).

Existing approaches for the management of myelofibrosis associated anemia include transfusion, erythropoiesis-stimulating agents in patients with low
erythropoietin levels, corticosteroids, androgens (including danazol), immunomodulators, and splenectomy. Each of these treatments is described by the
National Comprehensive Cancer Network (NCCN) as minimally effective.

Momelotinib – A Potent and Selective JAK1, JAK2 and ACVR1 Inhibitor

Momelotinib is a potent, selective, small-molecule inhibitor of JAK1, JAK2 and ACVR1, under development for treatment of patients with myelofibrosis.
Momelotinib was discovered by Cytopia Research, which commenced an initial Phase 1/2 clinical trial in the United States in 2009. Cytopia was acquired
by YM BioSciences, Inc. in 2010, which continued clinical development of the compound, before its own acquisition by Gilead in 2013. Amongst other
clinical studies, Gilead conducted two registration-track Phase 3 trials in subjects with myelofibrosis, GS-US-352-0101 (SIMPLIFY-1) and GS-US-352-
1214 (SIMPLIFY-2). In August 2018, we acquired the momelotinib program from Gilead and assumed the role of IND sponsor in September 2018 with the
intent to continue development of momelotinib for the treatment of myelofibrosis. Several members of our senior management team were previously
executives at Cytopia and/or YM BioSciences and led the early development of momelotinib.

Following our acquisition of the program, we conducted a comprehensive review of data from the two Phase 3 trials of momelotinib, versus ruxolitinib
(SIMPLIFY-1) and best available therapy (BAT) (SIMPLIFY-2), as well as GS-US-352-1672, a Phase 2, open-label, translational biology trial of
momelotinib in transfusion-dependent subjects with myelofibrosis. In aggregate, our analyses across a variety of datasets show consistent benefit in the
three cardinal disease manifestations of myelofibrosis across a spectrum of intermediate-high risk patients with myelofibrosis, both JAK inhibitor-naïve
and previously JAK inhibitor-exposed: namely, (1) anemia and transfusion dependency, (2) constitutional symptoms, and (3) enlarged spleen, consistent
with the compound’s differentiated inhibition of JAK1, JAK2 and ACVR1. Although SIMPLIFY-1 met its primary efficacy endpoint of non-inferior spleen
volume reduction, it did not meet its key secondary efficacy endpoint of non-inferior reduction in total symptom score; and although SIMPLIFY-2 did not
meet its primary efficacy endpoint of superior reduction in spleen volume, it did meet its key secondary efficacy endpoint of superior reduction in total
symptom score. In both SIMPLIFY studies, additional secondary endpoints related to transfusion independence rate, transfusion dependence rate, and rate
of red blood cell transfusions all favored momelotinib over control and supported the potential for momelotinib to provide meaningful anemia benefits. As
such, we have determined that there is substantial clinical justification for further development of momelotinib.

Among the JAK-inhibitor class, momelotinib uniquely inhibits JAK1, JAK2 and ACVR1. All three targets contribute to disease manifestations of
myelofibrosis in complex and overlapping ways. The dominant roles for each in driving the various disease manifestations include: JAK1, abnormal
cytokine production and immune dysregulation; JAK2, clonal myeloid proliferation; and ACVR1, anemia. Evidence suggests that momelotinib can provide
an array of differentiated and compelling anemia-related clinical benefits, while also providing symptomatic and splenic benefits clinically comparable to
the approved standard-of-care, ruxolitinib. Specifically, via inhibition of JAK1 and JAK2, momelotinib is uniquely positioned as the only JAK-inhibitor
demonstrated to provide comparable splenic benefit when compared directly to ruxolitinib in the JAK inhibitor treatment-naïve setting, while Phase 3 data
strongly suggest the potential for momelotinib to provide substantial symptom benefit for both JAK-inhibitor treatment-naïve and exposed patients with
myelofibrosis. In addition, momelotinib induces robust, clinically meaningful and consistent anemia benefits, likely via inhibition of ACVR1 and JAK1, as
demonstrated in the two momelotinib Phase 3 trials and in the Phase 2 translational biology trial (GS-US-352-1672) in transfusion-dependent patients.

6

Myelofibrosis-associated anemia is dependent on a number of factors and involves the hyperactivation of two parallel signal transduction pathways that
drive production of the peptide hormone hepcidin. Hepcidin is the master regulator of iron metabolism, and elevated levels in myelofibrosis perturbs iron
homeostasis and exacerbates anemia. The principle pathway directing hepcidin expression involves activation of ACVR1, whereas a secondary pathway
increases hepcidin in response to inflammation and JAK-STAT signaling. Momelotinib directly inhibits ACVR1, JAK1 and JAK2 to effectively limit
hepcidin production. This unique profile induces a dose-dependent decrease in serum hepcidin, restoring iron homeostasis and alleviating anemia.

In a nonclinical anemia model, momelotinib treatment increased circulating plasma iron, RBC production, and Hgb levels consistent with the observed
reduction in inflammatory cytokine and hepcidin levels associated with inhibition of JAK1, JAK2 and ACVR1.This effect of momelotinib was further
validated by data from trial GS-US-352-1672 in an advanced, transfusion-dependent myelofibrosis population in which 34% and 39% of patients achieved
transfusion independence for at least 12 and 8 weeks, respectively. Median plasma hepcidin levels declined acutely after momelotinib dosing and
chronically over the entire 24-week dosing period, suggesting momelotinib induced a sustained reduction of both predose (basal) and postdose levels of
hepcidin. In an exploratory post-hoc analysis, a substantial reduction in transfusion frequency was also observed in subjects who did not achieve complete
transfusion independence.

Similarly, substantially higher rates of transfusion independence and lower rates of transfusion dependency were observed in momelotinib-treated subjects
compared with ruxolitinib or BAT-treated subjects in the SIMPLIFY-1 and SIMPLIFY-2 pivotal trials.  In an exploratory aggregate analysis including 152
transfusion dependent patients treated with momelotinib across the SIMPLIFY-1, SIMPLIFY-2, and GS-US-352-1672 trials, the combined 8- and 12-week
transfusion independence response rates across this continuum of JAK-inhibitor-naïve and exposed, intermediate- and high-risk myelofibrosis patients,
were 48.7% and 44.1%, respectively. The rate of transfusion independence in transfusion-dependent subjects, along with other anemia benefits, were
broadly consistent across these trials, and are consistent with the empirical findings of a pronounced anemia benefit observed in initial Phase 1/2
momelotinib clinical studies.

In addition, there is extensive evidence of momelotinib’s sustained positive effects on hemoglobin (Hgb) and other anemia endpoints. A robust and long-
lasting increase in Hgb was observed in the GS-US-352-1672 trial, which enrolled only transfusion-dependent subjects. A similar observation was noted in
the JAK inhibitor-naïve SIMPLIFY-1 trial, where a rapid and sustained increase in Hgb was observed in subjects randomized to momelotinib, which
contrasted with the acute and profound reduction in Hgb by treatment with the standard-of-care, ruxolitinib. Notably, subjects who crossed over to
momelotinib treatment following 24 weeks of ruxolitinib therapy experienced a rapid and substantive increase in Hgb, ultimately achieving sustained Hgb
levels that exceeded those observed in the pretreatment baseline period.

In totality, over 1,200 subjects have been treated with momelotinib across more than 20 clinical studies, with over 820 myelofibrosis patients treated to
date. Uniquely among the JAK inhibitor class, this substantive body of clinical data has demonstrated consistent and reproducible therapeutic benefits for
momelotinib across all three hallmarks of myelofibrosis, anemia, enlarged spleen and symptoms. In general, momelotinib has proven to be generally well
tolerated, with certain patients having received continuous daily dosing of momelotinib for more than 10 years, indicative of momelotinib’s potential to
provide long-term tolerability and sustained benefit. In the randomized phases of SIMPLIFY-1 and SIMPLIFY-2, the most commonly reported treatment
emergent adverse events for subjects treated with momelotinib were thrombocytopenia, diarrhea, headache, asthenia and nausea. The most commonly
reported Serious Adverse Events (SAEs) were anemia, atrial fibrillation, diarrhea, pneumonia and cardiac failure. These SAEs include events assessed as
both related and unrelated to momelotinib and each occurred in < 4% of subjects.

Momelotinib – Next Steps

During the fourth quarter of 2019, we launched the MOMENTUM clinical trial for patients with myelofibrosis. The randomized double-blind global Phase
3 trial is designed to confirm the efficacy of momelotinib on myelofibrosis symptoms, transfusion independence and splenomegaly, as compared to
danazol. The trial is targeting enrollment of 180 myelofibrosis patients who are symptomatic, anemic and have been treated previously with a JAK
inhibitor. We anticipate reporting top-line data from the trial in the first half of 2022. Data from MOMENTUM, along with data from more than 820
myelofibrosis patients previously treated with momelotinib, will form the basis of the global registration strategy for momelotinib.

7

Our DDR Candidate – SRA737

SRA737, a Potent, Highly Selective, Orally Bioavailable Chk1 Inhibitor

SRA737 is a potent, highly selective, orally bioavailable small molecule inhibitor of Checkpoint kinase 1, an emerging target for the treatment of cancer
which has a key role in the DNA Damage Response. SRA737 was investigated in two Phase 1/2 clinical trials that were initiated in the third quarter of
2016 in the United Kingdom under a Clinical Trial Authorization (CTA). SRA737 was licensed to us in September 2016 and in January 2017, we
successfully transferred sponsorship of the trials to Sierra.

Checkpoint kinase 1 (Chk1) is a serine-threonine kinase and master regulator of cell cycle progression and the DNA Damage Response (DDR) replication
stress response. One of the hallmarks of cancer is genomic instability.  A major source of genomic instability in certain tumors arises as a consequence of
dysregulated cell cycle checkpoints and aberrant DNA replication, resulting in high replication stress (RS), which is manifested by stalled replication forks
and associated DNA damage. Chk1 regulates multiple cell-cycle phases, temporarily inhibiting the progression of cell replication and division in order to
ensure proper replication of the genome and repair of collapsed or damaged replication forks.  Chk1 stabilizes stalled replication forks, manages origin
firing to avoid further replication stress, and mediates DNA repair via homologous recombination in the event of fork collapse.  Tumors with high RS
become reliant on Chk1 to mitigate the potentially catastrophic consequences of excess genomic instability. As such, Chk1 represents a promising
therapeutic target in cancers with high RS, as inhibiting Chk1 drives excessive genomic instability which can result in replication catastrophe and tumor
cell death.

During the second quarter of 2019, we reported preliminary efficacy and safety data from these two trials at the 2019 ASCO Annual meeting. We also
announced plans to prioritize our resources on the development of momelotinib and that we would be launching a campaign exploring non-dilutive
strategic options to support any future continued development of SRA737. In the fourth quarter of 2020, we announced an amendment to the license
agreement with CPF to allow for the potential future clinical development of SRA737.

SRA737-01 Phase 1/2 Monotherapy Trial

This signal-seeking Phase 1/2 study (NCT02797964) was designed to investigate the safety and tolerability of continuous, oral daily dosing of SRA737, as
well as to survey a broad range of cancer indications and genetic contexts in the expansion phase, in order to evaluate preliminary anti-tumor activity and
delineate potential genetic signatures and/or tumor indications that might warrant additional therapeutic investigation.

At the 2019 ASCO Annual meeting, we reported preliminary efficacy and safety data from this trial. Evidence of anti-tumor activity was observed in
subjects with high grade serous ovarian carcinomas, colorectal, prostate and non-small cell lung cancers; no RECIST partial responses or complete
responses were confirmed, but several noteworthy tumor reductions were recorded.

SRA737-02 Phase 1/2 Low-Dose Gemcitabine Combination Trial

Extensive preclinical data, as well as emerging clinical data, support the synergistic interaction between Chk1 inhibition and gemcitabine.  Gemcitabine
profoundly depletes DNA replication building blocks, and targets proliferating cells by inducing replication stress through induction of stalled replication
forks and double-strand breaks.  Low concentrations of gemcitabine cause a prolonged cell cycle S-phase and induce hallmarks of replication stress without
inducing overt cytotoxicity. The critical role of Chk1 in mediating cellular responses to replication stress affords the opportunity to combine SRA737 with
sub-therapeutic concentrations of the replication stress-inducing agent gemcitabine.  

This signal-seeking Phase 1/2 study (NCT02797977) was designed to investigate the safety and tolerability of SRA737 in combination with sub-
therapeutic, low dose gemcitabine (LDG), as well as to evaluate preliminary anti-tumor activity of SRA737 potentiated by LDG in tumors with genetic
alterations predicted to confer increased intrinsic RS and Chk1i sensitivity. Relative to standard-of-care, gemcitabine doses tested were approximately 10-
25% of a standard chemotherapeutic dose.

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At the 2019 ASCO Annual meeting, we reported preliminary efficacy and safety data from this trial. Overall, Partial Responses were observed in six
subjects and 41 subjects had a best response of Stable Disease (SD); durable SD lasting ≥ 4 months was recorded in 32 subjects and was observed in all
expansion cohorts. The combination of SRA737+LDG was generally well tolerated. Following ASCO 2019, we announced plans to prioritize our resources
on the development of momelotinib and that we would be launching a campaign exploring non-dilutive strategic options to support any future continued
development of SRA737. In the fourth quarter of 2020, we announced an amendment to the license agreement with CPF to allow for the potential future
clinical development of SRA737.

Asset Purchase Agreement

In August 2018, we entered into an Asset Purchase Agreement with Gilead whereby we acquired worldwide rights to the pharmaceutical product
momelotinib, an investigational orally-bioavailable JAK1, JAK2 and ACVR1 inhibitor together with all related intellectual property rights and certain
other related assets. Pursuant to the agreement, we made a one-time upfront payment of $3.0 million in August 2018. In October 2019, we entered into an
amendment to the Asset Purchase Agreement in which we agreed to issue, subject to certain conditions, shares of common stock and a warrant to purchase
common stock to Gilead in consideration for meaningfully reduced royalty rates and elimination of a near term milestone payment in the Asset Purchase
Agreement. Pursuant to the amended agreement, milestone payments of up to an aggregate of $190.0 million may become payable to Gilead upon the
achievement of certain regulatory and commercial milestone events and we are now required to pay Gilead low double-digit to high-teens percent tiered
combined royalties based upon net sales. In January 2020, we entered into a securities purchase agreement with Gilead, pursuant to which we issued to
Gilead 725,283 shares of our common stock and a warrant to purchase 725,283 shares of common stock at a price per share of $13.20. 

License Agreements

CRT Pioneer Fund LP License Agreement

In September 2016, we entered into an exclusive license agreement with CRT Pioneer Fund LP (CPF) for worldwide rights, know-how and materials to
develop SRA737, a small molecule inhibitor targeting Checkpoint kinase 1, an emerging target to treat cancer which has a key role in the DNA Damage
Response. Pursuant to the agreement, we made a one-time upfront payment of $7.0 million to CPF in October 2016 and paid $2.0 million to CPF in
January 2017 for the successful transfer of two ongoing Phase I clinical trials. Pursuant to the original license agreement, additional milestone payments of
up to an aggregate of $319.5 million may have become payable to CPF upon the achievement of certain milestones. In November 2020, we entered into an
amendment to the license agreement with CPF, which amended the terms and reduced the amounts of certain future milestones. Pursuant to the amended
agreement, future milestone payments of up to an aggregate of $290.0 million may become payable to CPF upon the achievement of certain developmental,
regulatory and commercial milestones, including a milestone payment of $2.0 million upon the dosing of the first patient of the first trial of SRA737
following the effective date of the amendment. In addition, we are required to pay CPF, on a product-by-product and country-by-country basis, tiered high
single-digit to low double-digit royalties on the net sales of any product successfully developed until the later of (i) the date when such licensed product is
no longer covered by a valid patent claim within the licensed intellectual property, (ii) the expiration of any data, marketing or other statutory exclusivity
rights covering the licensed product, or (iii) a specified period after the first commercial sale of the licensed product. Such royalties will be reduced on a
product-by-product and country-by-country basis under certain conditions, including if certain generic competition exists in such country, or if we are
required to pay royalties to third parties in order to develop or commercialize the licensed product.

The license agreement will expire on the date of expiration of our obligation to pay royalties to CPF. Either party may terminate the license agreement if
the other party materially breaches the license agreement, subject to certain cure provisions, and CPF may terminate the license agreement in certain
limited circumstances as described in the license agreement. The license agreement may also be terminated at any time by us upon 90 days’ prior written
notice to CPF.

9

Carna Biosciences, Inc. Collaboration Agreement

In May 2016, we entered into an exclusive license agreement with Carna Biosciences, Inc. (Carna) for worldwide rights to develop and commercialize
SRA141, a small molecule kinase inhibitor targeting Cdc7. In exchange for this exclusive right, we paid Carna an upfront payment of $0.9 million in June
2016. In June 2020, we entered into a collaboration agreement with Carna effectively terminating the license agreement. Pursuant to the collaboration
agreement, Carna paid an upfront fee of $0.3 million for the exclusive worldwide rights for SRA141 and other transition services. In addition, we may be
entitled to single-digit royalties on product sales, on a product-by-product basis, and low to mid-teen profit share on royalty and non-royalty income.

The collaboration agreement will expire on the date of expiration of Carna’s obligation to pay royalties to us. We may terminate the collaboration
agreement if Carna materially breaches the agreement, subject to certain cure provisions. The collaboration agreement may also be terminated at any time
by Carna upon 30 days’ prior written notice to us.

Intellectual Property

Our commercial success depends in part on our ability to obtain and maintain proprietary or intellectual property protection for momelotinib and SRA737
and future product candidates, to operate without infringing on the proprietary rights of others and to prevent others from infringing our proprietary or
intellectual property rights. Our strategy is to seek to protect our proprietary position and intellectual property position by, among other methods, filing
patent applications related to our proprietary technology and product candidates in the United States and in foreign jurisdictions. We also rely on trade
secrets, know-how and continuing technological innovation to develop and maintain our proprietary and intellectual property position.

We have acquired all rights to patent portfolios directed to compositions of matter and methods of use related to momelotinib and other JAK 1/2 and
ACVR1 inhibitors. As of December 31, 2020, these rights included three issued U.S. patents comprising claims directed to compositions and analogs of
momelotinib and methods of using momelotinib for the treatment of myelofibrotic indications as a single agent. Two of these patents will expire in 2028
while the third patent will expire in 2030, absent any extensions. As of December 31, 2020, these rights also include 53 issued foreign patents and one
pending foreign patent application in 48 jurisdictions, including Australia, Canada, China, several countries in Europe, Japan, Korea, Mexico, Russia and
others comprising claims directed to compositions of momelotinib for the treatment of myelofibrotic indications as a single agent. These foreign patents,
and any patent issuing from the pending foreign patent application, are expected to expire in 2028, absent any extension. As of December 31, 2020, these
rights also included one issued U.S. utility patent and one reissued U.S. utility patent, and one pending reissue application comprising claims directed to
different polymorph and salt forms of momelotinib, and methods of their use for the treatment of myelofibrotic indications. These patents will expire in
2035, absent any extension. Note that for issued U.S. patents, up to five years of patent term extension is available for a single patent directed to the
composition of momelotinib, bringing the possible patent exclusivity in the U.S. out to 2040. As of December 31, 2020, these rights also included 46 issued
foreign patents, and 14 pending foreign patent applications in 52 jurisdictions, including Australia, Brazil, Canada, China, several countries in Europe,
Hong-Kong, India, Israel, New Zealand, Mexico, Japan, Korea, Singapore and Taiwan comprising claims directed to different polymorph and salt forms of
momelotinib. These foreign patents, and any patent issuing from these pending foreign patent applications, are expected to expire in 2035, absent any
extension. Note that for issued European patents, up to five years of term extension is available via a Supplementary Protection Certificate (SPC) for a
single patent directed to the composition of momelotinib, bringing the possible patent exclusivity in Europe out to 2040. As of December 31, 2020, these
rights also included four issued foreign patents in four jurisdictions, including Australia, New Zealand, Singapore and South Africa comprising claims
directed to methods of using momelotinib for the treatment of anemia. As of December 31, 2020, these rights also included one issued U.S. patent
comprising claims directed to methods of using momelotinib for the treatment of ACVR1-mediated diseases. This U.S. patent will expire in 2037, absent
any extensions. Additionally, as of December 31, 2020, these rights also included one pending Patent Cooperation Treaty application, and two foreign
pending application comprising claims directed to platelet count-agnostic methods of using momelotinib for the treatment of myelofibrosis. We have filed
and will continue to file patent applications directed to the composition of matter and methods of use related to various aspects of momelotinib as they
develop.

10

We have exclusively licensed CPF’s rights to patents owned by Cancer Research Technology (CPF), a subsidiary of Cancer Research UK (CRUK), directed
to compositions of matter and methods of use related to SRA737 and other Chk1 inhibitors. As of December 31, 2020, these rights included two issued
U.S. patents and two pending U.S. patent application comprising claims directed to compositions of SRA737 and methods of using SRA737 for the
treatment of cancer indications as a single agent, or in combination with a DNA damaging agent. The two issued U.S. patents and any patents issuing from
the pending U.S. utility application are expected to expire in 2033, absent any adjustments or extensions. As of December 31, 2020, these rights also
included 27 issued foreign patents and 6 pending foreign patent applications in 27 foreign jurisdictions, including Australia, Canada, China, Europe and
Japan comprising claims directed to compositions of SRA737 and methods of using SRA737 for the treatment of cancer indications as a single agent, or in
combination with a DNA damaging agent. These foreign patents, and any patents issuing from these pending foreign patent applications, are expected to
expire in 2033, absent any extensions. As of December 31, 2020, these rights also included, one pending U.S. application and 4 pending foreign
applications comprising claims directed to biomarkers and patient selection when using SRA737 to treat cancer indications. Any patents issuing from these
pending patent applications are expected to expire in 2038, absent any adjustments or extensions. As of December 31, 2020, these rights also included one
pending U.S. application and 8 pending foreign applications comprising claims directed to methods of using SRA737 in combination with PARP inhibitors
for inhibiting tumor reduction. Any patents issuing from these pending patent applications are expected to expire in 2038, absent any adjustments or
extensions. As of December 31, 2020, these rights also included one pending U.S. application and 7 pending foreign applications comprising claims
directed to methods of using SRA737 as a monotherapy or in combination therapy to treat cancer indications. Any patents issuing from these pending
patent applications are expected to expire in 2039, absent any adjustments or extensions. As of December 31, 2020, these rights also included one pending
Patent Cooperation Treaty application filed by the Company and The University of Texas M.D. Anderson Cancer Center comprising claims directed to
methods of using SRA737 to treat cancer indications. Additionally, as of December 31, 2020, these rights also included one pending Patent Cooperation
Treaty application comprising claims directed to methods of using SRA737 in the treatment of cancer associated with an intermediate mutational burden
(TMB), or genetic abnormality in one or more particular genes associated with replicative stress. We have filed and will continue to file patent applications
directed to the composition of matter and methods of use related to various aspects of SRA737 as they develop.

The term of individual patents depends upon the legal term for patents in the countries in which they are obtained. In most countries, including the United
States, the patent term is 20 years from the earliest filing date of a non-provisional patent application. In the United States, a patent’s term may be
lengthened by patent term adjustment, which compensates a patentee for administrative delays by the USPTO in examining and granting a patent, or may
be shortened if a patent is terminally disclaimed over an earlier filed patent. The term of a patent that covers a drug may also be eligible for patent term
extension when FDA approval is granted, provided statutory and regulatory requirements are met. In the future, if and when our product candidates receive
approval by the FDA, the European Medicines Agency (EMA) or other foreign regulatory authorities, we expect to apply for patent term extensions on
issued patents covering those drugs, depending upon the length of the clinical trials for each product candidate and other factors. There can be no assurance
that any of our pending patent applications will issue or that we will benefit from any patent term extension or favorable adjustment to the term of any of
our patents.

As with other oncology companies, our ability to maintain and solidify our proprietary and intellectual property position for our product candidates and
technologies will depend on our success in obtaining effective patent claims and enforcing those claims if granted. However, patent applications that we
may file or license from third parties may not result in the issuance of patents. We also cannot predict the breadth of claims that may be allowed or enforced
in our patents. Our issued patents and any issued patents that we may receive in the future may be challenged, invalidated or circumvented. For example,
we cannot be certain of the priority of inventions covered by pending third-party patent applications. If third parties prepare and file patent applications that
also claim technology or therapeutics to which we have rights, we may have to participate in interference proceedings to determine priority of invention,
which could result in substantial costs to us, even if the eventual outcome is favorable to us. In addition, because of the extensive time required for clinical
development and regulatory review of a product candidate we may develop, it is possible that, before momelotinib and SRA737 or any of our product
candidates can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby reducing
any advantage of any such patent.

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In addition to patents, we rely upon unpatented trade secrets and know-how and continuing technological innovation to develop and maintain our
competitive position. We seek to protect our proprietary information, in part, using confidentiality agreements with our scientific advisors and consultants,
and invention assignment agreements with our employees. The confidentiality agreements are designed to protect our proprietary information and, in the
case of agreements or clauses requiring invention assignment, to grant us ownership of technologies that are developed through our relationship with a third
party.

Competition

The hematology and oncology industries are characterized by rapidly advancing technologies, intense competition and a strong emphasis on proprietary
products. The key competitive factors affecting the success of all of our product candidates, if approved, are likely to be their efficacy, safety, convenience,
price, the level of generic competition and the availability of reimbursement from government and other third-party payors. While we believe that our
technology, knowledge, experience and scientific resources provide us with competitive advantages, we face potential competition from many different
sources, including major pharmaceutical, specialty pharmaceutical and biotechnology companies, academic institutions and governmental agencies and
public and private research institutions. Any product candidates that we successfully develop and commercialize will compete with existing therapies that
are available for the indication or indications for which they are approved and new therapies that may become available in the future.

To our knowledge, there are currently two approved myelofibrosis drugs that specifically rely on JAK inhibition, ruxolitinib, marketed by Incyte
Corporation as Jakafi® in the United States and by Novartis as Jakavi in the rest of the world and fedratinib, marketed by Celgene Corporation as Inrebic®
in the United States. Fedratinib was also recently approved in Europe. In addition, there is one additional JAK inhibitor competitor in clinical development,
at a similar state of development or more advanced than us. CTI Biopharma Corporation is developing pacritinib, for a subset of myelofibrosis patients
with platelet counts less than 50,000/uL commenced its rolling NDA submission in October 2020. However, to our knowledge, there are no drugs that
target JAK1, JAK2 and ACVR1 on the market, nor in development. Other competitors developing myelofibrosis therapeutics include Acceleron,
Constellation Pharma, AbbVie, Kartos and Incyte. Celgene and Acceleron are developing luspatercept in a Phase 3 clinical trial for myelofibrosis.
Constellation Pharma is developing pelabresib (CPI-0610), a BET inhibitor in Phase 3 clinical trial in combiniation with ruxolitinib. AbbVie announced
two Phase 3 clinical trials in combination with ruxolitinib for JAKi naïve and previously JAKi treated patients. Kartos announced clinical trial plans for
KRT-232, a MDM2 inhibitor for JAKi relapsed or refractory MF patients. Incyte launched Phase 3 clinical trials to evaluate parsaclisib, in combination
with ruxolitinib. In addition, there are several Phase 1 and Phase 2 clinical trials being conducted in myelofibrosis by various companies, including a Phase
2 study of a deuterated form of momelotinib being run by Zelgen Biopharmaceuticals in China. Several additional companies are advancing assets in the
early stages of development potentially for the myelofibrosis market. If momelotinib is approved, it will compete with existing therapies for the indication
or indications for which it is approved. While we believe that momelotinib may have the ability to provide an anemia benefit in addition to treating the
other manifestations of myelofibrosis, which we believe is unique within the JAK inhibitor class of agents, the market for momelotinib is competitive, and
physicians and other prescribers may not recommend or prescribe momelotinib over other competing products.

To our knowledge, there are no approved drugs that specifically target Chk1 on the market, but there are a number of competitors in clinical development,
at a similar stage of development or more advanced than us. To our knowledge, Esperas Pharma is conducting a Phase 1/2 clinical trial of an oral Chk1
inhibitor as monotherapy and in combination with gemcitabine in patients with advanced or metastatic cancer. There are also preclinical programs focused
on developing Chk1 inhibitors. If SRA737 is approved, it will compete with existing therapies and currently marketed drugs for the indication or
indications for which it is approved.

Many of the companies against which we may compete have significantly greater financial and other resources and expertise in research and development,
manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and marketing approved products than we do. Mergers and
acquisitions in the hematology and oncology industries may result in even more resources being concentrated among a smaller number of our competitors.
Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established
companies. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial
sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or that may be necessary for, our programs.

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Our commercial opportunity could be reduced or eliminated if our competitors develop and commercialize products that are safer, more effective, have
fewer or less severe side effects, are more convenient or are less expensive than any drugs that we may develop. Our competitors also may obtain FDA or
foreign regulatory approval for their product candidates more rapidly than we may obtain approval for ours, which could result in our competitors
establishing a strong market position before we are able to enter the market. In addition, our ability to compete may be affected in many cases by insurers
or other third-party payors seeking to encourage the use of generic drugs.

Manufacturing

We do not have any manufacturing facilities or personnel. We currently rely, and expect to continue to rely, on third parties for the manufacture and supply
of preclinical study and clinical trial materials in relation to our lead product candidate, momelotinib, including materials for any combination trials that we
may undertake, and any future potential product candidates that we may develop for preclinical and clinical testing, as well as for commercial manufacture
if momelotinib receives marketing approval.

We do not currently have arrangements in place for redundant supply. We believe that our manufacturers have sufficient capacity to meet our current
demand and, in the event that they fail to meet our demand, adequate alternative sources for such materials exist. However, there is a risk that if supplies
are interrupted or result in poor yield or quality, it would materially harm our business. We will continue to evaluate product demand requirements and
qualify alternate sources for momelotinib, and our other product candidates on an as-needed basis.

Manufacturing is subject to extensive regulations that impose various procedural and documentation requirements, which govern recordkeeping,
manufacturing processes and controls, personnel, quality control and quality assurance, among others. Our contract manufacturing organizations are
required to comply with current good manufacturing practice (cGMP) regulations, which are regulatory requirements for the production of pharmaceuticals
that will be used in humans.

Government Regulation

FDA Approval Process

In the United States, pharmaceutical products are subject to extensive regulation by the FDA. The Federal Food, Drug, and Cosmetic Act, or FDCA, and
other federal and state statutes and regulations, govern, among other things, the research, development, testing, manufacture, storage, recordkeeping,
approval, labeling, promotion and marketing, distribution, post-approval monitoring and reporting, sampling, and import and export of pharmaceutical
products. Failure to comply with applicable U.S. requirements may subject a company to a variety of administrative or judicial sanctions, such as FDA
refusal to approve pending NDAs, withdrawal of an approval, clinical hold, warning or untitled letters, product recalls, product seizures, total or partial
suspension of production or distribution, injunctions, consent decrees, fines, refusal of government contracts, restitution, disgorgement, civil or criminal
penalties, and criminal prosecution. Any agency or judicial enforcement action could have a material adverse effect on us.

Pharmaceutical product development for a new product or certain changes to an approved product in the United States typically involves preclinical
laboratory and animal tests, the submission to the FDA of an IND, which must become effective before clinical testing may commence, and adequate and
well-controlled clinical trials to establish the safety and effectiveness of the product candidate for each indication for which FDA approval is sought.
Satisfaction of FDA pre-market approval requirements typically takes many years and the actual time required may vary substantially based upon the type,
complexity and novelty of the product or disease.

The process required by the FDA before a drug may be marketed in the United States generally involves the following:

•

•

completion of nonclinical laboratory tests, animal studies, and formulation studies in accordance with FDA’s good laboratory practice
requirements and other applicable regulations;

submission to the FDA of an IND, which must become effective before human clinical trials may begin;

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•

•

•

•

•

•

•

approval by an independent IRB ethics committee, either centralized or with respect to each clinical site, before each clinical trial may be
initiated;

performance of adequate and well-controlled human clinical trials in accordance with GCP requirements to establish the safety and
efficacy of the proposed drug for its intended use;

submission to the FDA of an NDA after completion of all pivotal trials;

determination by the FDA within 60 days of its receipt of an NDA to accept the filing for substantive review;

satisfactory completion of an FDA advisory committee review, if applicable;

satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the drug is produced to assess
compliance with cGMP requirements to ensure that the facilities, methods and controls are adequate to preserve the drug’s identity,
strength, quality, and purity, and of selected clinical investigation sites to assess compliance with GCPs; and

FDA review and approval of the NDA to permit commercial marketing of the product for particular indications for use in the United
States.

Prior to beginning the first clinical trial with a product candidate in the United States, we must submit an IND to the FDA. An IND is a request for
authorization from the FDA to administer an investigational new drug product to humans. The central focus of an IND submission is on the general
investigational plan and the protocol(s) for clinical studies. The IND also includes results of animal and in vitro studies assessing the toxicology,
pharmacokinetics, pharmacology, and pharmacodynamic characteristics of the product; chemistry, manufacturing, and controls information; and any
available human data or literature to support the use of the investigational product. Preclinical tests include laboratory evaluation of product chemistry,
formulation and toxicity, as well as animal trials to assess the characteristics and potential safety and efficacy of the product. The conduct of the preclinical
tests must comply with federal regulations and requirements, including good laboratory practices (GLPs). The results of preclinical testing are submitted to
the FDA as part of an IND along with other information, including information about product chemistry, manufacturing and controls, and a proposed
clinical trial protocol. Long-term preclinical tests, such as animal tests of reproductive toxicity and carcinogenicity, may continue after the IND is
submitted.

A 30-day waiting period after the submission of each IND is required prior to the commencement of clinical testing in humans. The IND automatically
becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, raises safety concerns or questions about the proposed
clinical trial. In such a case, the IND may be placed on clinical hold and the IND sponsor and the FDA must resolve any outstanding concerns or questions
before the clinical trial can begin. Submission of an IND therefore may or may not result in FDA authorization to begin a clinical trial.

Clinical trials involve the administration of the investigational new drug to eligible human subjects under the supervision of a qualified investigator.
Clinical trials must be conducted (i) in compliance with federal regulations; (ii) in compliance with good clinical practice (GCP), an international standard
meant to protect the rights and health of patients and to define the roles of clinical trial sponsors, administrators and monitors, and which includes the
requirement that all research subjects provide their informed consent for their participation in any clinical study; and (iii) under protocols detailing the
objectives of the trial, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated. Each protocol involving testing on U.S.
patients and subsequent protocol amendments must be submitted to the FDA as part of the IND.

 The FDA may order the temporary or permanent discontinuation of a clinical trial at any time, or impose other sanctions, if it believes that the clinical trial
either is not being conducted in accordance with FDA requirements or presents an unacceptable risk to the clinical trial patients. The trial protocol and
informed consent information for patients in clinical trials must also be submitted to an institutional review board (IRB) for approval. An IRB is an
appropriately constituted group that has been formally designated to review and monitor biomedical research involving human subjects and has the
authority to approve, require modifications in (to secure approval), or disapprove research. IRB review serves an important role in the protection of the
rights and welfare of human

14

 
 
 
 
 
 
 
research subjects. Regulatory authorities, the IRB, or the sponsor may suspend a clinical trial at any time on various grounds, including a finding that the
subjects are being exposed to an unacceptable health risk or that the clinical trial is unlikely to meet its stated objectives. Some studies also include
oversight by an independent group of qualified experts organized by the clinical study sponsor, known as a data safety monitoring board, which may review
data and endpoints at designated check points, make recommendations and/or halt the clinical trial if it determines that there is an unacceptable safety risk
for subjects or other grounds, such as no demonstration of efficacy. There are also requirements governing the reporting of ongoing clinical studies and
clinical study results to public registries.

Human clinical trials are typically conducted in three sequential phases that may overlap or be combined:

•

•

•

Phase 1: The product candidate is initially introduced into healthy human subjects or patients with the target disease or condition. These
studies are designed to test the safety, dosage tolerance, absorption, metabolism, and distribution of the investigational product in humans,
the side effects associated with increasing doses, and, if possible, to gain early evidence on effectiveness. In the case of some products for
severe or life-threatening diseases, especially when the product may be too inherently toxic to ethically administer to healthy volunteers,
the initial human testing is often conducted in patients.

Phase 2: The product candidate is administered to a limited patient population with a specified disease or condition to evaluate the
preliminary efficacy, optimal dosages, and dosing schedule and to identify possible adverse side effects and safety risks. Multiple Phase 2
clinical trials may be conducted to obtain information prior to beginning larger and more expensive Phase 3 clinical trials.

Phase 3: The product candidate is administered to an expanded patient population to further evaluate dosage, to provide statistically
significant evidence of clinical efficacy and to further test for safety, generally at multiple geographically dispersed clinical trial sites.
These clinical trials are intended to establish the overall risk/benefit ratio of the investigational product and to provide an adequate basis
for product approval.

Post-approval clinical trials, sometimes referred to as Phase 4 studies, may be conducted after initial marketing approval. These clinical trials are used to
gain additional experience from the treatment of patients in the intended therapeutic indication. In certain instances, the FDA may mandate the performance
of Phase 4 clinical trials as a condition of approval of an NDA. Concurrent with clinical trials, companies usually complete additional animal studies and
must also develop additional information about the chemistry and physical characteristics of the drug and finalize a process for manufacturing the product
in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of
the product candidate and, among other things, the manufacturer must develop methods for testing the identity, strength, quality, and purity of the final
drug. In addition, appropriate packaging must be selected and tested, and stability studies must be conducted to demonstrate that the product candidate does
not undergo unacceptable deterioration over its shelf life.

While the IND is active and before approval, progress reports summarizing the results of the clinical trials and nonclinical studies performed since the last
progress report must be submitted at least annually to the FDA, and written IND safety reports must be submitted to the FDA and investigators for serious
and unexpected suspected adverse events, findings from other studies suggesting a significant risk to humans exposed to the same or similar drugs, findings
from animal or in vitro testing suggesting a significant risk to humans, and any clinically important increased incidence of a serious suspected adverse
reaction compared to that listed in the protocol or investigator brochure.

Further, as a result of the COVID-19 pandemic, we may be required to develop and implement additional clinical trial policies and procedures designed to
help protect subjects from the COVID-19 virus. For example, the FDA has issued guidance on conducting clinical trials during the pandemic, which
describes a number of considerations for sponsors of clinical trials impacted by the pandemic, including certain reporting requirements, and additional
guidance on the good manufacturing practice considerations for responding to COVID-19 infection and other topics. We may be required to make further
adjustments to our clinical trials or business operations based on current or future guidance and regulatory requirements as a result of the COVID-19
pandemic.

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Assuming successful completion of all required testing in accordance with all applicable regulatory requirements, the results of product development
nonclinical and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the chemistry of the drug, proposed
labeling and other relevant information are submitted to the FDA as part of an NDA requesting approval to market the product. The submission of an NDA
is subject to the payment of substantial user fees; a waiver of such fees may be obtained under certain limited circumstances. Additionally, no user fees are
assessed on NDAs for products designated as orphan drugs, unless the product also includes a non-orphan indication.

The FDA has 60 days from its receipt of an NDA to determine whether the application will be accepted for filing based on the agency’s threshold
determination that it is sufficiently complete to permit substantive review. Once the submission is accepted for filing, the FDA begins a substantive review.
The FDA may request additional information rather than accept an NDA for filing. In this event, the NDA must be resubmitted with the additional
information. The resubmitted application is also subject to review before the FDA accepts it for filing.

The FDA has agreed to certain performance goals in the review of NDAs. Most such applications for standard review drug products are reviewed within
ten to twelve months; most applications for priority review drugs are reviewed in six to eight months. Priority review can be applied to drugs that the FDA
determines offer major advances in treatment or provide a treatment where no adequate therapy exists. For biologics, priority review is further limited only
for drugs intended to treat a serious or life-threatening disease relative to the currently approved products. The review process for both standard and priority
review may be extended by FDA for three additional months to consider certain late-submitted information, or information intended to clarify information
already provided in the submission.

The FDA may also refer applications for novel drug products, or drug products that present difficult questions of safety or efficacy, to an advisory
committee—typically a panel that includes clinicians and other experts—for review, evaluation and a recommendation as to whether the application should
be approved. The FDA is not bound by the recommendation of an advisory committee, but it generally follows such recommendations. Before approving
an NDA, the FDA will typically inspect one or more clinical sites to assure compliance with GCP. Additionally, the FDA will inspect the facility or the
facilities at which the drug is manufactured. FDA will not approve the product unless compliance with current good manufacturing practices (cGMPs) is
satisfactory and the NDA contains data that provide evidence that the drug is safe and effective in the indication studied. If the FDA determines that the
application, manufacturing process, or manufacturing facilities are not acceptable, it will outline the deficiencies in a Complete Response Letter and often
will request additional testing or information. Notwithstanding the submission of any requested additional information, the FDA ultimately may decide that
the application does not satisfy the regulatory criteria for approval.

After FDA evaluates the NDA and the manufacturing facilities, it issues either an approval letter or a Complete Response Letter. A Complete Response
Letter indicates that the review cycle of the application is complete, and the application will not be approved in its present form. A Complete Response
Letter usually describes the specific deficiencies in the NDA identified by the FDA and may require additional clinical data, such as an additional pivotal
Phase 3 clinical trial or other significant and time-consuming requirements related to clinical trials, nonclinical studies, or manufacturing. If a Complete
Response Letter is issued, the sponsor must resubmit the NDA, addressing all of the deficiencies identified in the letter to the FDA satisfaction, or
withdraw the application. Even if such data and information are submitted, the FDA may decide that the NDA does not satisfy the criteria for approval. If,
or when, those deficiencies have been addressed to the FDA’s satisfaction in a resubmission of the NDA, the FDA will issue an approval letter. FDA has
committed to reviewing such resubmissions in two or six months depending on the type of information included.

If regulatory approval of a product is granted, such approval will be granted for particular indications and may entail limitations on the indicated uses for
which such product may be marketed. As a condition of NDA approval, the FDA may require Risk Evaluation and Mitigation Strategies (REMS) to help
ensure that the benefits of the drug outweigh the potential risks. REMS can include medication guides, communication plans for healthcare professionals
and elements to assure safe use (ETASU). ETASU can include, but are not limited to, special training or certification for prescribing or dispensing,
dispensing only under certain circumstances, special monitoring and the use of patient registries. The requirement for REMS can materially affect the
potential market and profitability of the drug, and typically require substantial documentation and communication with the FDA.

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Once approved, the FDA may withdraw the product approval if compliance with pre- and post-marketing requirements is not maintained or if problems
occur after the product reaches the marketplace. The FDA may also require one or more Phase 4 post-market studies and surveillance to further assess and
monitor the product’s safety and effectiveness after commercialization, and may limit further marketing of the product based on the results of these post-
marketing studies. In addition, new government requirements, including those resulting from new legislation, may be established, or the FDA’s policies
may change, which could impact the timeline for regulatory approval or otherwise impact ongoing development programs.

Changes to some of the conditions established in an approved application, including changes in indications, labeling or manufacturing processes or
facilities, require submission and FDA approval of a new NDA or NDA supplement before the change can be implemented. An NDA supplement for a new
indication typically requires clinical data similar to that in the original application, and the FDA uses the same procedures and actions in reviewing NDA
supplements as it does in reviewing NDAs.

Pediatric Information

Under the Pediatric Research Equity Act (PREA), NDAs or supplements to NDAs must contain data to assess the safety and effectiveness of the drug for
the claimed indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the
drug is safe and effective. The FDA may grant full or partial waivers, or deferrals, for submission of data. Unless otherwise required by regulation, PREA
generally does not apply to a drug for an indication for which orphan designation has been granted; however, beginning in 2020, PREA will apply to NDAs
for orphan-designated drugs if the drug is molecularly targeted cancer product intended for the treatment of an adult cancer and is directed at a molecular
target that FDA has determined is substantially relevant to the growth or progression of a pediatric cancer. The Best Pharmaceuticals for Children Act
(BPCA) provides NDA holders a six-month extension of any exclusivity—patent or non-patent—for a drug if certain conditions are met. Conditions for
exclusivity include the FDA’s determination that information relating to the use of a new drug in the pediatric population may produce health benefits in
that population, FDA making a written request for pediatric studies, and the applicant agreeing to perform, and reporting on, the requested studies within
the statutory timeframe. Applications under the BPCA are treated as priority applications, with all of the benefits that designation confers.

Expedited Development and Review Programs

The FDA has a Fast Track designation program that is intended to expedite or facilitate the process for reviewing new drug products that meet certain
criteria. Specifically, new drugs are eligible for Fast Track designation if they are intended to treat a serious or life-threatening disease or condition and
demonstrate the potential to address unmet medical needs for the disease or condition. With regard to a Fast Track product, the FDA may consider for
review sections of the NDA on a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the
sections of the NDA, the FDA agrees to accept sections of the NDA and determines that the schedule is acceptable, and the sponsor pays any required user
fees upon submission of the first section of the NDA.

Any product submitted to the FDA for approval, including a product with a Fast Track designation, may also be eligible for other types of FDA programs
intended to expedite development and review, such as priority review and accelerated approval. A product is eligible for priority review if it has the
potential to provide safe and effective therapy where no satisfactory alternative therapy exists or a significant improvement in the treatment, diagnosis, or
prevention of a disease compared to marketed products. The FDA will attempt to direct additional resources to the evaluation of an application for a new
drug designated for priority review in an effort to facilitate the review. The FDA endeavors to review applications with priority review designations within
six months of the filing date as compared to ten months for review of new molecular entity NDAs under its current PDUFA review goals.

In addition, a product may be eligible for accelerated approval. Drug products intended to treat serious or life-threatening diseases or conditions may be
eligible for accelerated approval upon a determination that the product has an effect on a surrogate endpoint that is reasonably likely to predict clinical
benefit, or on a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, that is reasonably likely to predict an effect on
irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity, or prevalence of the condition and the availability or lack
of alternative treatments. As a condition of approval, the FDA may require that a sponsor of a drug receiving accelerated approval perform adequate and
well-controlled post-marketing clinical trials. In addition, the FDA currently requires pre-approval of promotional materials as a condition for accelerated
approval, which could adversely impact the timing of the commercial launch of the product.  Accelerated approval or Fast Track programs do not reduce
the amount of clinical data necessary to establish the drug is both safe and effective or the standards for approval.

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The Food and Drug Administration Safety and Innovation Act established a category of drugs referred to as “breakthrough therapies” that may be eligible
to receive breakthrough therapy designation. A sponsor may seek FDA designation of a product candidate as a “breakthrough therapy” if the product is
intended, alone or in combination with one or more other products, to treat a serious or life-threatening disease or condition and preliminary clinical
evidence indicates that the product may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such
as substantial treatment effects observed early in clinical development. The designation includes all of the Fast Track program features, as well as more
intensive FDA interaction and guidance. The breakthrough therapy designation is a distinct status from both accelerated approval and priority review,
which can also be granted to the same drug if relevant criteria are met. If a product is designated as breakthrough therapy, the FDA will work to expedite
the development and review of such drug.

Fast Track designation, priority review, accelerated approval, and breakthrough therapy designation do not change the standards for approval, but may
expedite the development or approval process. We previously announced that the FDA has granted Fast Track designation to momelotinib for the treatment
of patients with intermediate/high-risk myelofibrosis who have previously received a JAK inhibitor. Even if a product qualifies for Fast Track designation
or any of these other programs, the FDA may later decide that the product no longer meets the conditions for qualification or decide that the time period for
FDA review or approval will not be shortened. We may continue to explore some of these opportunities for our product candidates as appropriate.

Disclosure of Clinical Trial Information

Sponsors of clinical trials of FDA-regulated products, including drugs, are required to register and disclose certain clinical trial information. Information
related to the product, patient population, phase of investigation, trial sites and investigators, and other aspects of the clinical trial is then made public as
part of the registration. Sponsors are also obligated to discuss the results of their clinical trials after completion. Disclosure of the results of these trials can
be delayed in certain circumstances for up to two years after the date of completion of the trial. Competitors may use this publicly-available information to
gain knowledge regarding the progress of development programs.

Post-Approval Requirements

Any products manufactured or distributed by us pursuant to FDA approvals are subject to pervasive and continuing regulation by the FDA, including,
among other things, requirements relating to record-keeping, reporting of adverse experiences, periodic reporting, product sampling and distribution, and
advertising and promotion of the product. After approval, most changes to the approved product, such as adding new indications or other labeling changes,
are subject to prior FDA review and approval. There are continuing, annual program fees for any marketed products. Drug manufacturers and their
subcontractors are required to register their establishments with the FDA and certain state agencies, and are subject to periodic unannounced inspections by
the FDA and certain state agencies for compliance with cGMP, which impose certain procedural and documentation requirements upon us and our third-
party manufacturers. Changes to the manufacturing process are strictly regulated, and, depending on the significance of the change, may require prior FDA
approval before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting
requirements upon us and any third-party manufacturers that we may decide to use. Accordingly, manufacturers must continue to expend time, money, and
effort in the area of production and quality control to maintain compliance with cGMP and other aspects of regulatory compliance.

The FDA may withdraw approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product
reaches the market. Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or
with manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety
information; imposition of post-market studies or clinical studies to assess new safety risks; or imposition of distribution restrictions or other restrictions
under a REMS program. Other potential consequences include, among other things:

•

•

restrictions on the marketing or manufacturing of the product, complete withdrawal of the product from the market or product recalls;

fines, warning letters, or untitled letters;

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•

•

•

•

•

•

•

clinical holds on post-approval or Phase IV clinical studies, if applicable;

refusal of the FDA to approve pending applications or supplements to approved applications, or suspension or revocation of product
license approvals;

product seizure or detention, or refusal to permit the import or export of products;

consent decrees, corporate integrity agreements, debarment, or exclusion from federal healthcare programs;

mandated modification of promotional materials and labeling and the issuance of corrective information;

the issuance of safety alerts, Dear Healthcare Provider letters, press releases, and other communications containing warnings or other
safety information about the product; or

injunctions or the imposition of civil or criminal penalties.

The FDA closely regulates the marketing, labeling, advertising, and promotion of drug products. A company can only promote the indications that are
approved by the FDA and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and regulations
prohibiting the promotion of off-label uses. Failure to comply with these requirements can result in, among other things, adverse publicity, warning letters,
corrective advertising, and potential civil and criminal penalties. Physicians may prescribe, in their independent professional medical judgment, legally
available products for uses that are not described in the product’s labeling and that differ from those tested by us and approved by the FDA. In many cases,
physicians view such off-label uses are the best treatment for many patients in varied circumstances. The FDA does not regulate the behavior of physicians
in their choice of treatments. The FDA does, however, restrict manufacturer’s communications on the subject of off-label use of their products. The federal
government has levied large civil and criminal fines against companies for alleged improper promotion of off-label use and has enjoined companies from
engaging in off-label promotion. The FDA and other regulatory agencies have also required that companies enter into consent decrees or permanent
injunctions under which specified promotional conduct is changed or curtailed. However, companies may share truthful and not misleading information
that is otherwise consistent with a product’s FDA-approved labelling.

The Hatch-Waxman Act

Orange Book Listing

In seeking approval for a drug through an NDA, applicants are required to list with the FDA each patent whose claims cover the applicant’s product. Upon
approval of a drug, each of the patents listed in the application for the drug is then published in the FDA’s Approved Drug Products with Therapeutic
Equivalence Evaluations, commonly known as the Orange Book. Drugs listed in the Orange Book can, in turn, be cited by potential generic competitors in
support of approval of an abbreviated new drug application (ANDA). An ANDA provides for marketing of a drug product that has the same active
ingredients in the same strengths and dosage form as the listed drug and has been shown through bioequivalence testing to be therapeutically equivalent to
the listed drug. Other than the requirement for bioequivalence testing, ANDA applicants are not required to conduct, or submit results of, pre-clinical or
clinical tests to prove the safety or effectiveness of their drug product. Drugs approved in this way are commonly referred to as “generic equivalents” to the
listed drug and can often be substituted by pharmacists under prescriptions written for the original listed drug.

The ANDA applicant is required to certify to the FDA concerning any patents listed for the approved product in the FDA’s Orange Book. Specifically, the
applicant must certify that (i) the required patent information has not been filed; (ii) the listed patent has expired; (iii) the listed patent has not expired but
will expire on a particular date and approval is sought after patent expiration; or (iv) the listed patent is invalid or will not be infringed by the new product.
The ANDA applicant may also elect to submit a section viii statement certifying that its proposed ANDA label does not contain (or carve out) any language
regarding the patented method-of-use rather than certify to a listed method-of-use patent. If the applicant does not challenge the listed patents, the ANDA
application will not be approved until all the listed patents claiming the referenced product have expired. A certification that the new product will not
infringe the already approved product’s listed patents, or that such patents are invalid, is called a Paragraph IV certification. If the ANDA applicant has
provided a Paragraph IV certification to the FDA, the

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applicant must also send notice of the Paragraph IV certification to the NDA and patent holders once the ANDA has been accepted for filing by the FDA.
The NDA and patent holders may then initiate a patent infringement lawsuit in response to the notice of the Paragraph IV certification. The filing of a
patent infringement lawsuit within 45 days of the receipt of a Paragraph IV certification automatically prevents the FDA from approving the ANDA until
the earlier of 30 months, expiration of the patent, settlement of the lawsuit, or a decision in the infringement case that is favorable to the ANDA applicant.

The ANDA application also will not be approved until any applicable non-patent exclusivity listed in the Orange Book for the referenced product has
expired.

Marketing Exclusivity and Patent Term Extension

Market exclusivity provisions authorized under the FDCA can delay the submission and approval of certain marketing applications for products containing
the same active ingredient. Upon NDA approval of a new chemical entity (NCE), which is a drug that contains no active moiety that has been approved by
FDA in any other NDA, that drug receives five years of marketing exclusivity during which FDA cannot receive any ANDA seeking approval of a generic
version of that drug. Certain changes to a drug, such as the addition of a new indication to the package insert, are associated with a three-year period of
exclusivity during which FDA cannot approval an ANDA for a generic drug that includes the change. An ANDA may be submitted one year before NCE
exclusivity expires if a Paragraph IV certification is filed. If there is no listed patent in the Orange Book, there may not be a Paragraph IV certification, and,
thus, no ANDA may be filed before the expiration of the exclusivity period.

After NDA approval, owners of relevant drug patents may apply for up to a five-year patent term extension. The allowable patent term extension is
calculated as half of the drug’s testing phase (the time between IND application and NDA submission) and all of the review phase (the time between NDA
submission and approval). The time can be shortened if FDA determines that the applicant did not pursue testing and review with due diligence. The total
patent term after the extension may not exceed 14 years from NDA approval. For patents that might expire during the review phase, the patent owner may
request an interim patent extension. An interim patent extension increases the patent term by one year and may be renewed up to four times. For each
interim patent extension granted, the post-approval patent extension is reduced by one year. The Director of the United States Patent and Trademark Office
must determine that approval of the drug covered by the patent for which a patent extension is being sought is likely. Interim patent extensions are not
available for a drug for which an NDA has not been submitted. Up to five years of patent term extension is potentially available for a single US issued
patent directed to the momelotinib composition of matter upon NDA approval. We have acquired patent rights including two issued U.S. utility patents and
one pending reissue application comprising claims directed to a polymorph and salt form of momelotinib. These patents will expire in 2035, absent any
extension. If five years of patent term extension is applied to one of these patents, the patent exclusivity for momelotinib in the U.S. would extend to either
2040 or the maximum allowable 14-year limit from NDA approval, whichever is sooner.

During the exclusivity period, the FDA may not approve or even accept for review an abbreviated new drug application (ANDA) or an NDA submitted
under Section 505(b)(2) (505(b)(2) NDA), submitted by another company for another drug based on the same active moiety, regardless of whether the drug
is intended for the same indication as the original innovative drug or for another indication, where the applicant does not own or have a legal right of
reference to all the data required for approval. However, an application may be submitted after four years if it contains a certification of patent invalidity or
non-infringement to one of the patents listed with the FDA by the innovator NDA holder.

The FDCA alternatively provides three years of marketing exclusivity for an NDA, or supplement to an existing NDA if new clinical investigations, other
than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for
example new indications, dosages, or strengths of an existing drug. This three-year exclusivity covers only the modification for which the drug received
approval on the basis of the new clinical investigations and does not prohibit the FDA from approving ANDAs or 505(b)(2) NDAs for drugs containing the
active agent for the original indication or condition of use. Five-year and three-year exclusivity will not delay the submission or approval of a full NDA.
However, an applicant submitting a full NDA would be required to conduct or obtain a right of reference to any nonclinical studies and adequate and well-
controlled clinical trials necessary to demonstrate safety and effectiveness.

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Pediatric exclusivity is another type of marketing exclusivity available in the United States. Pediatric exclusivity provides for an additional six months of
marketing exclusivity attached to another period of exclusivity if a sponsor conducts clinical trials in children in response to a written request from the
FDA. The issuance of a written request does not require the sponsor to undertake the described clinical trials. In addition, orphan drug exclusivity, as
described above, may offer a seven-year period of marketing exclusivity, except in certain circumstances.

Other Healthcare Laws

In the U.S., the research, manufacturing, distribution, sale and promotion of drug products that we are developing are subject to regulation by various
federal, state and local authorities in addition to the FDA, including the Centers for Medicare & Medicaid Services, other divisions of the U.S. Department
of Health and Human Services (e.g., the Office of Inspector General), the U.S. Department of Justice, state Attorneys General, and other state and local
government agencies. For example, sales, marketing and scientific/educational grant programs must comply with applicable health care fraud and abuse
laws, such as the federal Anti-Kickback Statute, the federal False Claims Act, Stark law, and implementing regulations, and similar state laws. Pricing and
rebate programs must comply with the Medicaid Drug Rebate Program requirements of the Omnibus Budget Reconciliation Act of 1990, as amended, and
the Veterans Health Care Act of 1992, as amended. If products are made available to authorized users of the Federal Supply Schedule of the General
Services Administration, additional laws and requirements apply. Other laws and regulations that may apply to prescription drug manufacturers include the
Sunshine Act, prescription drug price reporting requirements, and various state transparency and reporting laws. All business activities of prescription drug
manufacturers are also potentially subject to federal and state consumer protection and unfair competition laws.

The federal Anti-Kickback Statute prohibits, among other things, knowingly and willfully offering, paying, soliciting or receiving remuneration to induce,
or in return for, purchasing, leasing, ordering or arranging for the purchase, lease or order of any healthcare item or service reimbursable under Medicare,
Medicaid, or other federally financed healthcare programs. The Patient Protection and Affordable Care Act as amended by the Health Care and Education
Reconciliation Act (PPACA) amended the intent element of the federal statute so that a person or entity no longer needs to have actual knowledge of the
statute or specific intent to violate it in order to commit a violation. This statute has been interpreted broadly to apply to arrangements between
pharmaceutical manufacturers on the one hand and any referral source on the other, including prescribers, purchasers and formulary managers. The term
“remuneration” has been broadly interpreted to include anything of value, including, for example, gifts, discounts, the furnishing of supplies or equipment,
credit arrangements, payments of cash, waivers of payments, ownership interests, and service fees, unless expressly exempted or protected by a safe harbor.
Further, the statute has been interpreted to cover any arrangement where one purpose of the remuneration was to obtain remuneration in exchange for
referral or to induce further referrals for an item or service. Violations of the anti-kickback statute are punishable by imprisonment, criminal fines, civil
monetary penalties and exclusion from participation in federal healthcare programs. Although there are a number of statutory exemptions and regulatory
safe harbors protecting certain common activities from prosecution or other regulatory sanctions, the exemptions and safe harbors are drawn narrowly, and
practices that involve remuneration intended to induce prescribing, purchases or recommendations may be subject to scrutiny if they do not qualify for an
exemption or safe harbor. Our practices may not in all cases meet all of the criteria of an applicable safe harbor for protection from liability under the
federal Anti-Kickback Statute. The reach of the Anti-Kickback Statute was broadened by PPACA, which, among other things, amends the intent
requirement of the federal Anti-Kickback Statute such that the government does not need to prove that a person had the intent to specifically violate the
statute in order to find a violation. In addition, the PPACA provides that the government may assert that a claim including items or services resulting from a
violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the federal False Claims Act (discussed below) or the
civil monetary penalties statute, which imposes fines against any person who is determined to have presented or caused to be presented claims to a federal
healthcare program that the person knows or should know is for an item or service that was not provided as claimed or is false or fraudulent. Additionally,
many states have adopted laws similar to the federal Anti-Kickback Statute, and some of these state prohibitions apply to referral of patients for healthcare
items or services reimbursed by any third-party payer, not only the Medicare and Medicaid programs in at least some cases, and do not expressly provide
for certain safe harbors or impose different requirements for safe harbor protection under applicable state laws.

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The federal False Claims Act imposes liability on any person or entity that, among other things, knowingly presents, or causes to be presented, a false or
fraudulent claim for payment by a federal healthcare program. The qui tam provisions of the False Claims Act allow a private individual to bring civil
actions on behalf of the federal government alleging that the defendant has submitted or cause to be submitted a false claim to the federal government, and
to share in any monetary recovery. In recent years, the number of suits brought by private individuals has increased dramatically. In addition, various states
have enacted false claims laws analogous to the False Claims Act. Many of these state laws apply where a claim is submitted to any third-party payer and
not merely a federal healthcare program. There are many potential bases for liability under the False Claims Act. Liability arises, primarily, when an entity
knowingly submits, or causes another to submit, a false claim for reimbursement to the federal government. The False Claims Act has been used to assert
liability on the basis of inadequate care, kickbacks and other improper referrals, improperly reported government pricing metrics such as Best Price or
Average Manufacturer Price, improper use of Medicare billing numbers when detailing the provider of services, improper promotion of off-label uses (i.e.,
uses not expressly approved by FDA in a drug’s label), and allegations as to misrepresentations with respect to the services rendered. Our future activities
relating to the reporting of discount and rebate information and other information affecting federal, provincial, state and third party reimbursement of our
products, and the sale and marketing of our products and our service arrangements or data purchases, among other activities, may be subject to scrutiny
under these laws. We are unable to predict whether we would be subject to actions under the False Claims Act or a similar state law, or the impact of such
actions. However, the cost of defending such claims, as well as any sanctions imposed, could adversely affect our financial performance. Also, the Health
Insurance Portability and Accountability Act of 1996, or HIPAA, created several new federal crimes, including healthcare fraud, and false statements
relating to healthcare matters. The healthcare fraud statute prohibits knowingly and willfully executing a scheme to defraud any healthcare benefit program,
including private third-party payers. The false statements statute prohibits knowingly and willfully falsifying, concealing or covering up a material fact or
making any materially false, fictitious or fraudulent statement in connection with the delivery of or payment for healthcare benefits, items or services.

In addition, we may be subject to, or our marketing activities may be limited by, data privacy and security regulation in the U.S. and foreign jurisdictions in
which we conduct our business, including jurisdictions in which we conduct our clinical trials. For example, HIPAA and its implementing regulations
established uniform federal standards for certain “covered entities” (healthcare providers, health plans and healthcare clearinghouses) governing the
conduct of certain electronic healthcare transactions and protecting the security and privacy of protected health information. The American Recovery and
Reinvestment Act of 2009 included expansion of HIPAA’s privacy and security standards called the Health Information Technology for Economic and
Clinical Health Act, or HITECH. Among other things, HITECH makes HIPAA’s privacy and security standards directly applicable to “business
associates”—independent contractors, service providers or agents of covered entities that create, receive, maintain, or transmit protected health information
in connection with providing a service for or on behalf of a covered entity. HITECH also increased the civil and criminal penalties that may be imposed
against covered entities, business associates and possibly other persons, and gave state attorneys general new authority to file civil actions for damages or
injunctions in federal courts to enforce the federal HIPAA laws and seek attorney’s fees and costs associated with pursuing federal civil actions.

The Physician Payment Sunshine Act, or the Sunshine Act, requires applicable manufacturers and certain distributors of prescription drugs, among other
products, that are available for coverage by Medicare, Medicaid or the Children’s Health Insurance Program to report annually to the Secretary of HHS: (i)
payments or other transfers of value made by that entity, or by a third-party as directed by that entity, to covered recipients, such as physicians and teaching
hospitals, or to third parties on behalf of physicians or teaching hospitals; and (ii) physician ownership (including immediate family ownership) and
investment interests in the entity. Effective January 1, 2022, these reporting and transparency requirements will extend to include payments and transfers of
value made during the previous year to certain non-physician covered recipients, including physician assistants, nurse practitioners, and other mid-level
practitioners. There are also an increasing number of state and local “sunshine” or transparency and reporting laws that require applicable manufacturers to
make reports to states on pricing and marketing information. The U.S. federal government discloses the reported information on a publicly available
website. Several states have enacted legislation requiring pharmaceutical companies to, among other things, establish marketing compliance programs, file
periodic reports with the state, make periodic public disclosures on sales, marketing, pricing, clinical trials and other activities, and/or register their sales
representatives, as well as to prohibit pharmacies and other healthcare entities from providing certain physician prescribing data to pharmaceutical
companies for use in sales and marketing, and to prohibit certain other sales and marketing practices. These federal, state, and local laws may affect our
sales, marketing, and other promotional activities by imposing administrative and compliance burdens on us. If we fail to track and report as required by
these laws or otherwise comply with these laws, we could be subject to the penalty provisions of the pertinent state and federal authorities.

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Because of the breadth of these health care laws and the narrowness of available statutory and regulatory exemptions, it is possible that some of our
business activities could be subject to challenge under one or more of such laws. If our operations are found to be in violation of any of the federal and state
laws described above or any other governmental regulations that apply to us, we may be subject to penalties, including criminal and significant civil
monetary penalties, damages, fines, imprisonment, exclusion from participation in government healthcare programs, injunctions, recall or seizure of
products, total or partial suspension of production, denial or withdrawal of pre-marketing product approvals, private qui tam actions brought by individual
whistleblowers in the name of the government or refusal to allow us to enter into supply contracts, including government contracts, the curtailment or
restructuring of our operations, and corporate integrity agreement, which impose certain compliance, certification and reporting obligations, any of which
could adversely affect our ability to operate our business and our results of operations. To the extent that any of our products are sold in a foreign country or
if we contract with vendors or independent contractors outside of the U.S., we may be subject to similar foreign laws and regulations, which may include,
for instance, applicable post-approval requirements, including safety surveillance, anti-corruption/anti-bribery laws, anti-kickback laws, healthcare fraud
and abuse laws, and implementation of corporate compliance programs and reporting of payments or transfers of value to healthcare professionals. While
we are not aware of any current issues, we are unable to predict whether we will be subject to actions under applicable healthcare laws, or the impact of
such actions on our business. However, the costs of defending such actions or claims, as well as any sanctions imposed, could result in a material adverse
effect on our business or financial condition.

Coverage and Reimbursement

Significant uncertainty exists as to the coverage and reimbursement status of any product candidates for which we obtain regulatory approval. Sales of
pharmaceutical products for which we receive regulatory approval for commercial sale will depend, in part, on the availability of third-party coverage and
adequate reimbursement from third-party payors. Third-party payors include government health administrative authorities, managed care providers, private
health insurers and other organizations. These third-party payers may deny coverage or reimbursement for a product or therapy in whole or in part if they
determine that the product or therapy was not medically appropriate or necessary. Third-party payers may attempt to control costs by limiting coverage to
specific drug products on an approved list, or formulary, which might not include all of the FDA-approved drug products for a particular indication, and by
limiting the amount of reimbursement for particular procedures or drug treatments.

The cost of pharmaceuticals continues to generate substantial governmental and third-party payer interest. We expect that the pharmaceutical industry will
experience pricing pressures due to the trend toward managed healthcare, the increasing influence of managed care organizations and additional legislative
proposals. Third-party payers are increasingly challenging the price and examining the medical necessity and cost-effectiveness of medical products and
services, in addition to their safety and efficacy. We may need to conduct expensive pharmacoeconomic studies in order to demonstrate the medical
necessity and cost-effectiveness of our products, in addition to the costs required to obtain the FDA approvals. The product candidates that we develop may
not be considered medically necessary or cost-effective. A payer’s decision to provide coverage for a drug product does not imply that an adequate
reimbursement rate will be approved. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an
appropriate return on our investment in product development. Some third-party payers also require pre-approval or prior authorization of coverage for new
or innovative drug therapies before they will reimburse healthcare providers who prescribe such therapies or patients who use such prescription drugs.
While we cannot predict whether any proposed cost-containment measures will be adopted or otherwise implemented in the future, these requirements or
any announcement or adoption of such proposals could have a material adverse effect on our ability to obtain adequate prices for our product candidates
and to operate profitably.

The marketability of any product candidates for which we or our collaborators receive regulatory approval for commercial sale may suffer if the
government and third-party payors fail to provide adequate coverage and reimbursement. In addition, emphasis on managed care in the United States has
increased and we expect will continue to increase the pressure on pharmaceutical pricing. Coverage policies and third-party reimbursement rates may
change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which we or our collaborators receive
regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.

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In international markets, reimbursement and healthcare payment systems vary significantly by country, and many countries have instituted price ceilings on
specific products and therapies. There can be no assurance that our products will be considered medically reasonable and necessary for a specific
indication, that our products will be considered cost-effective by third-party payers, that coverage or an adequate level of reimbursement will be available
or that the third-party payers’ reimbursement policies will not adversely affect our ability to sell our products profitably.

In addition, in many foreign countries, the proposed pricing for a drug must be approved before it may be lawfully marketed. The requirements governing
drug pricing and reimbursement vary widely from country to country. For example, the EU provides options for its member states to restrict the range of
medicinal products for which their national health insurance systems provide reimbursement and to control the prices of medicinal products for human use.
A member state may approve a specific price for the medicinal product or it may instead adopt a system of direct or indirect controls on the profitability of
the company placing the medicinal product on the market. There can be no assurance that any country that has price controls or reimbursement limitations
for pharmaceutical products will allow favorable reimbursement and pricing arrangements for any of our products. Historically, products launched in the
EU do not follow price structures of the United States and generally prices tend to be significantly lower.

Healthcare Reform

In the U.S. and foreign jurisdictions, there have been a number of legislative and regulatory changes to the healthcare system that could affect our future
results of operations. In particular, there have been and continue to be a number of initiatives at the U.S. federal and state levels that seek to reduce
healthcare costs.

Enacted in March 2010, the Patient Protection and Affordable Care Act, as amended, or PPACA, is a sweeping law intended to broaden access to health
insurance, reduce or constrain the growth of healthcare spending, enhance remedies against healthcare fraud and abuse, add new transparency requirements
for healthcare and health insurance industries, impose new taxes and fees on pharmaceutical and medical device manufacturers and impose additional
health policy reforms. Among other things, PPACA revises the definition of “average manufacturer price” for reporting purposes, which could increase the
amount of Medicaid drug rebates to states. Further, the new law imposes a significant annual fee on companies that manufacture or import branded
prescription drug products. Substantial new provisions affecting compliance have also been enacted, which may affect our business practices with
healthcare practitioners and a significant number of provisions are not yet, or have only recently become, effective. For example, in November 2020, HHS
finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly
or through pharmacy benefit managers, unless the price reduction is required by law. The rule also creates a new safe harbor for price reductions reflected
at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit managers and manufacturers. In December 2020,
CMS issued a final rule implementing significant manufacturer price reporting changes under the Medicaid Drug Rebate Program, including regulations
that affect manufacturer-sponsored patient assistance programs subject to pharmacy benefit manager accumulator programs and Best Price reporting related
to certain value-based purchasing arrangements. PPACA, as well as other legislation and regulations, may continue to place downward pressure on
pharmaceutical pricing, especially under the Medicare program, and may also increase our regulatory burdens and operating costs. In addition, other
legislative changes have been proposed and adopted since PPACA was enacted. These new laws may result in reductions in Medicare and other healthcare
funding, which could have a material adverse effect on our customers and accordingly, our financial operations.

There have been judicial and Congressional challenges and amendments to certain aspects of the PPACA, and we expect there will be additional challenges
and amendments to the PPACA in the future, including the potential repeal of all or part of PPACA. In addition, other legislative changes have been
proposed and adopted since the PPACA was enacted. These changes include aggregate reductions to Medicare payments to providers of up to 2% per fiscal
year, starting in 2013, which will remain in effect through 2030, with the exception of a temporary suspension implemented under various COVID-19 relief
legislation from May 1, 2020 through March 31, 2021, unless additional Congressional action is taken. In January 2013, the American Taxpayer Relief Act
of 2012, which, among other things, further reduced Medicare payments to several providers, including hospitals and cancer treatment centers, and
increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These new laws may result in
additional reductions in Medicare and other healthcare funding, which could have a material adverse effect on customers for our product candidates, if
approved, and, accordingly, our financial operations.

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There have been legislative and judicial efforts to repeal, replace, or change some or all of the ACA, including measures taken during the Trump
administration. The Tax Reform Act, among other things, included a provision that repealed, effective January 1, 2019, the tax-based shared responsibility
payment imposed by the ACA on certain individuals who fail to maintain qualifying health coverage for all or part of a year that is commonly referred to as
the “individual mandate.” In November 2020, the United States Supreme Court held oral arguments on the Fifth Circuit U.S. Court of Appeals decision that
held that the individual mandate is unconstitutional. It is uncertain how the United States Supreme Court will rule on this case or how healthcare measures
of the Biden administration will impact the PPACA and our business. Additionally, the 2020 federal spending package permanently eliminated, effective
January 1, 2020, the PPACA-mandated “Cadillac” tax on certain high-cost employer-sponsored insurance plans and the medical device excise tax, and
effective January 1, 2021, also eliminates the health insurer tax. The Bipartisan Budget Act of 2018, or the BBA, among other things, also amended the
PPACA, effective January 1, 2019, by increasing from 50% to 70% the point-of-sale discount that is owed by pharmaceutical manufacturers who
participate in Medicare Part D and closing the coverage gap in most Medicare drug plans, commonly referred to as the “donut hole.” In addition, CMS
published a final rule that would give states greater flexibility, effective January 1, 2020, in setting benchmarks for insurers in the individual and small
group marketplaces, which may have the effect of relaxing the essential health benefits required under the PPACA for plans sold through such
marketplaces.  

Further, there have been several Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more
transparency to product pricing, review the relationship between pricing and manufacturer patient programs, reduce the costs of drugs under Medicare and
reform government program reimbursement methodologies for drug products. At the federal level, the Trump administration’s budget proposal for fiscal
year 2021 included a $135 billion allowance to support legislative proposals seeking to reduce drug prices, increase competition, lower out-of-pocket drug
costs for patients, and increased patient access to lower cost generic and biosimilar drugs. In particular, on July 24, 2020 and September 13, 2020, the
Trump administration announced several executive orders related to prescription drug pricing that seek to implement several of the administration's
proposals. The FDA also released a final rule in September 2020 providing guidance for states to build and submit importation plans for drugs from
Canada. Further, in November 2020, HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to
plan sponsors under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The rule also creates a new
safe harbor for price reductions reflected at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit
managers and manufacturers. The CMS also issued an interim final rule implementing President Trump’s Most Favored Nation executive order, which
would tie Medicare Part B payments for certain physician-administered drugs to the lowest price paid in other economically advanced countries, effective
January 1, 2021. On December 28, 2020, the United States District Court in Northern California issued a nationwide preliminary injunction against
implementation of the interim final rule. In December 2020, CMS issued a final rule implementing significant manufacturer price reporting changes under
the Medicaid Drug Rebate Program, including regulations that affect manufacturer-sponsored patient assistance programs subject to pharmacy benefit
manager accumulator programs and Best Price reporting related to certain value-based purchasing arrangements. It is unclear to what extent these new
regulations will be implemented and to what extent these or any future legislation or regulation by the Biden administration will have on our business,
including our ability to generate revenue and achieve profitability. We expect additional state and federal healthcare reform measures will be adopted in the
future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced
demand for our product candidates or additional pricing pressures. The implementation of cost containment measures or other healthcare reforms may
prevent us from being able to generate revenue, attain profitability, or commercialize our product candidates if approved.

Our business activities may be subject to the Foreign Corrupt Practices Act of 1977, as amended, or FCPA, and similar anti-bribery or anti-corruption laws,
regulations or rules of other countries in which we operate, including the U.K. Bribery Act. The FCPA generally prohibits offering, promising, giving, or
authorizing others to give anything of value, either directly or indirectly, to a non-U.S. government official in order to influence official action, or otherwise
obtain or retain business. The FCPA also requires public companies to make and keep books and records that accurately and fairly reflect the transactions
of the corporation and to devise and maintain an adequate system of internal accounting controls. Our business is heavily regulated and therefore involves
significant interaction with public officials, including officials of non-U.S. governments. Additionally, in many other countries, the health care providers
who prescribe pharmaceuticals are employed by their government, and the purchasers of pharmaceuticals

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are government entities; therefore, our dealings with these prescribers and purchasers are subject to regulation under the FCPA. Recently the SEC and the
Department of Justice have increased their FCPA enforcement activities with respect to biotechnology and pharmaceutical companies. There is no certainty
that all of our employees, agents, contractors, or collaborators, or those of our affiliates, will comply with all applicable laws and regulations, particularly
given the high level of complexity of these laws. Violations of these laws and regulations could result in fines, criminal sanctions against us, our officers, or
our employees, the closing down of our facilities, requirements to obtain export licenses, cessation of business activities in sanctioned countries,
implementation of compliance programs, and prohibitions on the conduct of our business. Any such violations could include prohibitions on our ability to
offer our products in one or more countries and could materially damage our reputation, our brand, our international expansion efforts, our ability to attract
and retain employees, and our business, prospects, operating results, and financial condition.

Foreign Regulation

In addition to regulations in the United States, we will be subject to a variety of foreign regulations governing, among other things, research, development,
testing, manufacture, quality control, approval, labeling, packaging, storage, record-keeping, promotion, advertising, distribution, post-approval monitoring
and reporting, marketing and export and import of drugs, and reimbursement requirements. Generally, before a new drug can be marketed, considerable
data demonstrating its quality, safety and efficacy must be obtained, organized into a format specific for each regulatory authority, submitted for review and
approved by the regulatory authority. Whether or not we obtain FDA approval for a product, we must obtain the requisite approvals from regulatory
authorities in foreign countries prior to the commencement of clinical studies or marketing of the product in those countries. Certain countries outside of
the U.S. have a similar process that requires the submission of a clinical study application much like the IND prior to the commencement of human clinical
studies. The approval process varies from country to country and the time may be longer or shorter than that required to obtain FDA approval. The
requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary greatly from country to country and may require us
to perform additional pre-clinical or clinical testing.

In the European Union, Member States require both regulatory clearances by the national competent authority and a favorable ethics committee opinion
prior to the commencement of a clinical trial. Under the European Union regulatory systems, marketing authorization applications may be submitted under
either a centralized or decentralized procedure or national procedure. An additional route (mutual recognition procedure) is based on the recognition of
granted marketing authorizations by one or more EU countries. The centralized procedure is compulsory for certain types of medicines, including human
medicines containing new active substances to treat cancer.

We would be subject to the centralized authorization procedure, which provides for the grant of a single marketing authorization by the European
Commission that is valid for all 27 European Union Member States, as well as Iceland, Liechtenstein and Norway (who, together with the European Union
Member States) are members of the European Economic Area (EEA). Under the centralized procedure, pharmaceutical companies submit a single
marketing authorization application to the EMA. By law, a company can only start to market a medicine once it has received a marketing authorization.

The UK is no longer a member of the EU, but EU law remains applicable in Northern Ireland.  There are a number of new marketing authorization routes
available in the UK, Great Britain (England, Scotland and Wales) or Northern Ireland, in addition to the national procedure. As with the EU position, a
company can only start to market a medicine in the UK once it has received a marketing authorization.

European Regulation of Clinical Trials and Grant of Marketing Authorization

Pharmaceutical products in the European Union are subject to regulation under comprehensive legislation enacted by the European Commission in the
European Medicinal Products Directive (Directive 2001/83/EC), as amended. Centrally authorized products are also regulated by Regulation (EC) No.
726/2004. This legislation is binding on all Member States together with ancillary legislation governing research. In the UK, the main legislative texts
relating to human medicines is the Medicines Act 1968 and the Human Medicines Regulation 2012.

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Clinical Trial Authorization

Clinical trials in the European Union are regulated under European Council Directive 2001/20/EC (Clinical Trials Directive) on the implementation of GCP
in the conduct of clinical trials of medicinal products for human use. The Clinical Trials Directive requires the sponsor of an investigational medicinal
product to obtain a CTA, much like an IND in the United States, from the national competent authority of a European Union Member State in which the
clinical trial is to be conducted. The application for CTA must satisfy detailed requirements for the protection of trial subjects including requirements
relating to consent and specific rules for minors and adults unable to consent by reason of incapacity. The CTA application must be accompanied by an
investigational medicinal product dossier with supporting information prescribed by the Council Directive and corresponding national laws of the Member
States and further detailed in applicable guidance, including the European Commission Communication 2010/C 82/01. A clinical trial may only be
commenced after an Ethics Committee has given its approval.

A sponsor of a clinical trial must also follow certain procedures, including obtaining a unique EudraCT number by entering specified relevant information
in the EudraCT Community Clinical Trial System. In addition, Member States require that the manufacture and/or importation of investigational medicinal
products be authorized. Sponsors of investigational medicinal products must ensure compliance with, among other things, GCP and good manufacturing
practice (GMP) as well as requirements pertaining to safety reporting.

In April 2014, Regulation EU No 536/2014 (Clinical Trials Regulation) was adopted to replace the Clinical Trials Directive. The Clinical Trials Regulation
is intended to simplify the current rules for clinical trial authorization and standards of performance. For instance, there will be a streamlined application
procedure via a single-entry point, a European Union portal and database. The implementation of the Clinical Trials Regulation depends on confirmation of
full functionality of the Clinical Trials Information System (CTIS) through an independent audit, which commenced in September 2020. The system is
currently planned to go live in December 2021. The new clinical trial portal and database will be maintained by the EMA in collaboration with the
European Commission and the European Union Member States. The objectives of the new Regulation include consistent rules for conducting trials
throughout the European Union, consistent data standards and adverse events listing, and consistent information on the authorization status. Additionally,
information on the conduct and results of each clinical trial carried out in the European Union will be made publicly available.

The main legislation that applies to clinical trials in the UK is the UK Medicines for Human Use (Clinical Trials) Regulations 2004, which transposes the
Clinical Trials Directive into domestic law.  Consequently, the requirements and obligations that relate to the conduct of clinical trials in the UK currently
remain largely aligned with the EU position.  A CTA will be required to conduct a clinical trial in the UK, together with Ethics Committee
approval.  However, the sponsor of a clinical trial in the UK must be established in the UK or a country on an approved list (currently limited to the EU
Member States plus Iceland, Liechtenstein and Norway) or appoint a legal representative who is established on one of the aforementioned countries.
Clinical trials should also be registered on an established international register such as ISRCTN registry or ClinicalTrials.gov.  The UK also requires the
manufacture and/or importation of investigational medicinal products to be authorised.  There is no mutual recognition agreement between the UK and EU
on GMP, so medicines manufactured in the UK would be subject to GMP release in the EU.

Procedural Routes for Marketing Authorization in the European Union and UK

The European Union system for authorization of medicinal products for human use offers several routes: the centralized procedure, the decentralized
procedure, and the mutual recognition procedure, as well as domestic national routes. The centralized procedure provides for the grant of a single
marketing authorization that is valid for all European Union Member States as well as the EEA countries of Iceland, Liechtenstein and Norway. The
centralized procedure is mandatory for certain categories of investigational products, including human products containing a new active substance indicated
for the treatment of certain diseases, including cancer, AIDS, diabetes and neurodegenerative illness; orphan medicinal products; and medicinal products
manufactured using biotechnological processes. Applications for marketing authorization for such medicines must be submitted to the EMA, in which the
Committee for Medicinal Products for Human Use (CHMP) is generally responsible for conducting the initial assessment of a product.

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The decentralized and mutual recognition procedures are applicable to the majority of conventional medicinal products and are both based on the principle
of recognition of a marketing authorization by one or more Member States. The decentralized procedure is available for applicants who wish to market a
product in various European Union Member States where such product has not received marketing approval in any European Union Member State before.
In this procedure, an application for marketing authorization is submitted simultaneously in several Member States, one of them being chosen as the
“Reference Member State.” At the end of the procedure, national marketing authorizations are granted in the Reference and in the concerned Member
States. The mutual recognition procedure is compulsory when a medicinal product has already received a marketing authorization in one Member State and
is to be marketed in a Member State other than that in which it was first authorized. Any national marketing authorization granted by a European Union
Member State's national authority can be used to support an application for its mutual recognition by other Member States. Marketing authorization
applications can also be submitted directly to the Member State's national competent authority under the national route (if the centralized route is not
compulsory).  There are now multiple routes to obtain a marketing authorization in the UK, Great Britain or Northern Ireland, which are broadly
categorized as either (1) national routes (i.e.  the innovative licensing and access procedure (ILAP), the national procedure, rolling review, EC Decision
Procedure (ECDP), the MR/DC reliance procedure and unfettered access from Northern Ireland); or (2) international routes (i.e. Access Consortium to
market a medicine in the UK, Australia, Canada, Singapore and/or Switzerland; or the Project Orbis program for cancer treatments). The application
procedure will depend on the relevant procedure chosen.

All granted centrally authorized marketing authorizations automatically became Great Britain (GB) marketing authorizations on 1 January 2021. Though
there are several ways to obtain a marketing authorization for GB (and Northern Ireland) discussed above, the EDRCP is available for marketing
authorizations approved under the centralized procedure. Under this procedure the UK's regulator, the MHRA, can rely on the decision of the European
Commission on the approval of a new marketing authorization under centralized procedure for a period of two years from 1 January 2021 when
determining an application for a GB marketing authorization. Applicants submit a letter of intent to submit an EDRCP to the MHRA at least 4 weeks
before the submission of the application for the EDRCP marketing authorization application.  The marketing authorization application is submitted after
receipt of the positive opinion from the CHMP.

Standard for Approval of a Marketing Authorization in the European Union and UK

The objective of the EMA is the comprehensive evaluation of benefit/risk profile of a new medicinal product going through the centralized procedure. This
evaluation involves showing that the product has significant efficacy and safety, together with a satisfactory plan for risk management post-marketing. The
CHMP is the EMA’s expert committee responsible for human medicinal products. The CHMP is responsible for conducting the initial review of centrally
authorized marketing authorization applications and for assessing modifications or extensions (variations) to an existing marketing authorization. It also
considers the recommendations of the Pharmacovigilance Risk Assessment Committee on the safety of medicines on the market and when necessary,
recommends to the European Commission changes to a medicine’s marketing authorization, or its suspension or withdrawal from the market. The
marketing authorization application is similar to the NDA in the United States. All application procedures require an application in the common technical
document (CTD), which includes the submission of detailed information about the manufacturing and quality of the product, and non-clinical and clinical
trial information. The main scientific principle used by the CHMP in the evaluation of medicinal products is the benefit/risk ratio based on quality, efficacy,
safety, and risk management considerations. The CHMP assesses whether the data it reviews comply with the ICH-harmonized Good Practices published
for GCP, GMP and good laboratory practice (GLP). The CHMP also considers whether studies concluding efficacy and safety of products have sufficient
statistical power.

Marketing authorizations for the UK are submitted to the MHRA.  As the Medicinal Products Directive is transposed into domestic law, the standards of
clinical efficacy, safety, chemical control and manufacture as at 31 December 2020 (the end of the transition period for the UK’s exit from the EU) are
retained.  As Northern Ireland continues to apply EU law, medicines regulation for Great Britain is likely to be closely aligned with the EU for some time.

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Other Regulatory Issues

An exemption to the rule requiring marketing authorization permits Member States of the European Union (and the UK) to make a product available for
compassionate use to patients with a chronically or seriously debilitating disease or whose disease is considered life threatening, and who cannot be treated
satisfactorily by an authorized medicinal product. The medicinal product concerned must be undergoing clinical trials or the subject of application for
marketing authorization.

Quality of the medicinal products in question is governed by the GMP Directives. These lay down the legal framework for GMP for both marketed
medicinal products and investigational products in clinical trials. The Directive obliges manufacturers to comply with GMP for an effective pharmaceutical
quality assurance, quality control, systems for recording and reviewing complaints and a system for prompt recall of products in the distribution network.
With regards to post–marketing safety of newly authorized products, the EMA monitors and supervises the safety of medicines that have been authorized in
the EU to ensure their benefits outweigh their risks. Volume 4 of EudraLex published by the European Commission provides GMP guidelines used to
interpret the principles of GMP laid down in the GMP Directives..  

The pharmacovigilance legislation imposes a duty on Member States to collect information on the risks of products with regards to patients’ or public
health. That information must refer to adverse events arising from the use of the medicinal product within the terms of the marketing authorization as well
as use outside the authorized indication and use associated with occupational exposure.

There is a similar obligation on the marketing authorization holder (MAH) to operate a robust pharmacovigilance system equivalent to that of the relevant
Member State. The MAH must evaluate all safety and effectiveness information scientifically, consider the options for risk minimization and take
appropriate measures as necessary. As part of the pharmacovigilance system, the MAH must have permanently and continuously an appropriately qualified
person responsible for pharmacovigilance, maintain a pharmacovigilance master file, operate a risk management system for each medicinal product,
monitor the outcome of risk minimization measures contained in the risk management program and continually update the risk management system and
monitor the pharmacovigilance system to determine whether there are new risks or changes to the risk-benefit profile of the product(s).

Two recent developments have been introduced which further expand the European regulatory framework: the Falsified Medicines Directive and the
Pharmacovigilance Directive. The Falsified Medicines Directive obliges manufacturers of medicinal products to audit their suppliers of active substances to
ensure compliance with GMP. It also introduces a new obligation on product manufacturers to inform the competent authority (e.g., ANSM) and the
marketing authorization holder if they become aware that these products may be falsified, whether they are being distributed through the legitimate supply
chain or by illegal means. The Pharmacovigilance Directive obliges marketing authorization holders to monitor the safety of authorized products and detect
any change in their risk-benefit profile. A new pan-European clinical trial data information database has been created that will be complementary to the
database established for pharmacovigilance (Regulation (EC) No 726/2004 with respect to centrally authorized medicinal products).  In addition,
Commission Implementing Regulation (EU) No 520/2012 outlines the practical implications for marketing authorization holders, national competent
authorities, and the EMA. Also, Commission Delegated Regulation (EU) No 357/2014 on post-authorization efficacy studies specifies the situations in
which such studies may be required. Post-authorization efficacy studies may be required where concerns relating to some aspects of efficacy of the
medicinal product are identified and can be resolved only after the medicinal product has been marketed, or where the understanding of the disease, the
clinical methodology or the use of the medicinal product under real-life conditions indicate that previous efficacy evaluations might have to be revised
significantly. Brexit will disrupt the operation of pre- and post-authorization clinical trial infrastructure. The rules around GMP and pharmacovigilance in
the UK currently remain similar to the EU requirements.  However, the Falsified Medicines Directive will not apply in Great Britain though it is likely that
the UK will implement a procedure to minimise the risk of falsified medicines.  

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In addition, in May 2016, the EU formally adopted the General Data Protection Regulation, or GDPR, which applies to all EU member states from May 25,
2018 and replaced the European Union Data Protection Directive. The GDPR has imposed many new or additional requirements including, but not limited
to, obtaining consent of the individuals to whom the personal data relates, the nature and scope of notifications provided to the individuals, the security and
confidentiality of the personal data, data breach notification and using third party processors in connection with the processing of the personal data. Failure
to comply with the GDPR could subject us to regulatory sanctions, delays in clinical trials, criminal prosecution and/or civil fines or penalties. Additionally,
GDPR creates a direct cause of action by individual data subjects. The GDPR is a complex law and the regulatory guidance is still evolving, including with
respect to how the GDPR should be applied in the context of clinical trials or other transactions from that we may gain access to personal data. Beginning
in 2021, the UK will be a “third country” under the GDPR. These changes in the law will increase our costs of compliance and result in greater legal risks.
Other countries maintain different privacy laws that we are subject to.

Approval Outside the United States/European Union

For marketing outside the United States and the European Union, we are subject to foreign regulatory requirements governing human clinical testing and
marketing approval for our products. Whether or not FDA or European Commission approval has been obtained for a product, approval of the product by
comparable regulatory authorities of countries outside of the United States or the European Union, as the case may be, must be obtained prior to marketing
the product in those countries. Approval in one country does not assure that a product will be approved in another country. In certain countries, regulatory
requirements and approval processes are similar to those in the United States and the European Union, where approval decisions by regulators are based on
the regulators’ review of the results of clinical trials performed for specific indications. Other countries may have a less comprehensive review process in
terms of data requirements and may rely on prior marketing approval from a foreign regulatory authority in other countries such as the United States or the
European Union. In many countries outside of the United States, approvals for pricing, coverage and reimbursement offered by third-party payers,
including government payers and private insurance plans, are also required.

Employees and Human Capital Resources

As of December 31, 2020, we had 69 active employees, of which 14 had M.D. or Ph.D. degrees and 46 were engaged in research and development
activities. None of our employees are represented by a labor union or covered by a collective bargaining agreement. We consider our relationship with our
employees to be good.

Our human capital resources objectives include, as applicable, identifying, recruiting, retaining, incentivizing and integrating our existing and new
employees, advisors and consultants. The principal purposes of our equity and cash incentive plans are to attract, retain and reward personnel through the
granting of stock-based and cash-based compensation awards, in order to increase stockholder value and the success of our company by motivating such
individuals to perform to the best of their abilities and achieve our objectives.

Corporate Information

We were incorporated in Delaware in May 2003 as Phenome Systems, Inc. and changed our name to ProNAi Therapeutics, Inc. in April 2004. Shortly
thereafter, we merged with SenseGene Therapeutics Inc., a Michigan corporation, with ProNAi Therapeutics, Inc. being the surviving corporation. We
changed our name to Sierra Oncology, Inc. in January 2017. Our principal executive offices are located at 1820 Gateway Drive, Suite 110, San Mateo,
California 94404, and our telephone number is (650) 376-8679. Our website address is www.sierraoncology.com. Information contained on, or that can be
accessed through, our website is not incorporated by reference into this Annual Report, and you should not consider information on our website to be part
of this Annual Report.

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Available Information

We file Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and other information with the Securities and
Exchange Commission (SEC). Our filings with the SEC are available free of charge on the SEC’s website at www.sec.gov and on our website under the
“Investors” tab as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC.

Item  1A. Risk Factors.

Investing in our common stock involves a high degree of risk. You should carefully consider the risks described below, as well as the other information in
this report, including our consolidated financial statements and the related notes and “Management’s Discussion and Analysis of Financial Condition and
Results of Operations,” before deciding whether to invest in our common stock. The occurrence of any of the events or developments described below could
harm our business, financial condition, results of operations and growth prospects. In such an event, the market price of our common stock could decline,
and you may lose all or part of your investment.

Summary Risk Factors

The below summary of risk factors provides an overview of many of the risks we are exposed to in the normal course of our business activities. As a result,
the below summary risks do not contain all of the information that may be important to you, and you should read the summary risks together with the more
detailed discussion of risks set forth following this section under the heading "Risk Factors," as well as elsewhere in this Annual Report on Form 10-K.
Additional risks, beyond those summarized below or discussed elsewhere in this Annual Report on Form 10-K, may apply to our activities or operations as
currently conducted or as we may conduct them in the future or in the markets in which we operate or may in the future operate. Consistent with the
foregoing, we are exposed to a variety of risks, including risks associated with the following:

•

•

•

•

•

•

•

•

We have incurred net losses in every year since our inception and anticipate that we will continue to incur net losses for the foreseeable future.

Our business is highly dependent on the success of momelotinib. If we are unable to successfully develop, obtain regulatory approval for and
commercialize momelotinib, or experience significant delays in doing so, our business will be materially harmed.

If further preclinical development or clinical trials of momelotinib, or any other future product candidates that we may develop or acquire fail
to demonstrate acceptable safety and efficacy or do not otherwise produce positive results, we may incur additional costs or experience delays
in completing, or ultimately be unable to complete, the development and commercialization of current or future product candidates.

Our business, results of operations and financial condition have been adversely affected and may be materially adversely affected by the
COVID-19 pandemic.

We will need to acquire additional capital to complete the development and commercialization of momelotinib and any future product
candidates.

The manufacture of momelotinib and the comparator, danazol, requires outsourced, custom manufacturing and we may encounter difficulties in
production, particularly with respect to formulation, process development or scaling up of our manufacturing capabilities. If our third-party
manufacturers or suppliers encounter such difficulties, our ability to provide supply of momelotinib for preclinical studies, clinical trials or our
products for patients, if approved, or danazol for the MOMENTUM trial could be delayed or stopped, or we may be unable to maintain a
commercially viable cost structure.

Our reliance on third-party manufacturing partners or suppliers may cause our supply of research and development, preclinical and clinical
development materials to become limited or interrupted or fail to be of satisfactory quantity or quality.

We face significant competition from other hematology and oncology companies, and our operating results will suffer if we fail to compete
effectively.

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If we are unable to adequately prepare the market for the potential future commercialization of a product, we may not be able to generate
product revenue once marketing authorization is obtained. We currently have no marketing and sales organization and have no experience in
marketing products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell
momelotinib or any future product candidates, we may not be able to generate product revenue.

We may be unable to obtain U.S. or foreign regulatory approval of momelotinib, and, as a result, we may be unable to commercialize
momelotinib.

Our internal information technology systems, or those used by our CROs or other contractors or consultants, may fail or suffer security
breaches.

If we or any of our independent contractors, consultants, collaborators, manufacturers, vendors or service providers fail to comply with
healthcare and data privacy laws and regulations, we or they could be subject to enforcement actions, which could result in penalties and affect
our ability to develop, market and sell momelotinib or any future product candidates and may harm our reputation.

If we are not able to obtain and enforce patent protection for our technologies or momelotinib, development and commercialization of our
product candidates may be adversely affected.

Risks Related to Our Business and Industry

We have incurred net losses in every year since our inception and anticipate that we will continue to incur net losses for the foreseeable future.

We are a clinical stage hematology and oncology company with a limited operating history. Since inception, we have incurred significant operating losses.
Our net losses were $80.9 million, $88.3 million and $53.3 million for the years ended December 31, 2020, 2019 and 2018, respectively. As of
December 31, 2020, we had an accumulated deficit of $846.6 million. Investment in hematology and oncology product development is highly speculative
because it entails substantial upfront capital expenditures and significant risk that any potential product candidate will fail to demonstrate adequate efficacy
or an acceptable safety profile, gain regulatory approval and become commercially viable. For example, in June 2016, we decided to suspend the
development of our former lead product candidate PNT2258 after an interim analysis of data from a Phase 2 clinical trial of PNT2258 indicated only
modest efficacy. We have also decided to suspend the continued development of SRA141, which was licensed to Carna Biosciences in June 2020, to focus
our resources on the development of momelotinib and potentially SRA737. We have no products approved for commercial sale and have not generated any
revenue to date, and we continue to incur significant research and development and other expenses related to our ongoing operations. We expect to continue
to incur significant losses for the foreseeable future, and we expect these losses to increase as we continue the development of momelotinib, fund research
and preclinical studies and clinical trials, seek to identify additional product candidates, in-license additional products or technologies, seek regulatory
approval, prepare for potential commercialization which will require a significant investment in areas related to contract manufacturing and inventory
buildup and continue to operate as a public company.

Even if we succeed in commercializing momelotinib, or any future product candidates we may acquire or develop, we will continue to incur substantial
research and development and other expenditures to develop and market these and other product candidates. We may encounter unforeseen expenses,
difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net losses will depend, in part,
on the rate of future growth of our expenses and our ability to generate revenue. Our prior losses and expected future losses have had and will continue to
have an adverse effect on our stockholders’ equity and working capital.

Our business is highly dependent on the success of momelotinib. If we are unable to successfully develop, obtain regulatory approval for and
commercialize momelotinib, or experience significant delays in doing so, our business will be materially harmed.

Our business and future success depends on our ability to successfully develop, obtain regulatory approval for and commercialize momelotinib, a potent,
selective and orally-bioavailable JAK1, JAK2 and ACVR1 inhibitor. Momelotinib has been investigated in two completed Phase 3 trials for the treatment
of myelofibrosis, and we launched our MOMENTUM Phase 3 clinical trial for momelotinib in the fourth quarter of 2019 after receiving regulatory
feedback concerning the design of the trial.

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While momelotinib is a late-stage product candidate for which previous Phase 3 clinical trial data suggest the potential to provide promising safety and
efficacy in patients who are JAK inhibitor-naïve and in patients who have previously received a JAK inhibitor such as ruxolitinib, it will require additional
clinical testing, including at least one additional adequate and well-controlled Phase 3 clinical trial, before we can seek regulatory approval and begin
commercialization, if it all. While the FDA has provided regulatory clarity concerning the design of MOMENTUM, our Phase 3 clinical trial for
momelotinib, there is no guarantee that we will obtain regulatory approval and be able to begin commercialization. Before we can generate any revenue
from sales of momelotinib, we must complete additional development activities, including the submission of marketing applications such as New Drug
Applications (NDAs) or foreign equivalents, for regulatory review and approval in at least one jurisdiction, make substantial investments, obtain access to
sufficient commercial manufacturing capacity and engage in significant marketing and commercial access efforts.

We cannot commercialize momelotinib in the United States without first obtaining regulatory approval from the FDA. Similarly, we cannot commercialize
momelotinib outside of the United States without obtaining regulatory approval from similar regulatory authorities outside of the United States, such as the
EMA in Europe and the Medicines and Healthcare products Regulatory Agency (MHRA) in the United Kingdom. Applications for regulatory approval and
regulatory approval of momelotinib could be delayed or be denied for many reasons, including but not limited to the following:

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the FDA or foreign regulatory authorities may disagree with the number, design or implementation of our clinical trials;

the population studied in the clinical trial may not be considered sufficiently broad or representative to assure safety in the full population for
which we seek approval;

the FDA or foreign regulatory authorities may disagree with our interpretation of data from preclinical studies or clinical trials;

the data collected from clinical trials of momelotinib may not meet the level of statistical or clinical significance required by the FDA or
foreign regulatory authorities or may otherwise not be sufficient to support the submission of an NDA, marketing authorization application or
other submission or to obtain regulatory approval in the United States, the European Union or elsewhere;

the FDA or foreign regulatory authorities may require us to conduct additional preclinical studies and clinical trials;

we may be unable to demonstrate to the FDA or foreign regulatory authorities that our product candidate’s response rate, duration of response
or risk-benefit ratio for its proposed indication is acceptable;

the FDA or foreign regulatory authorities may fail to approve the manufacturing processes, test procedures and specifications applicable to the
manufacture of momelotinib, the facilities of third-party manufacturers with which we contract for clinical and commercial supplies may fail to
maintain a compliance status acceptable to the FDA or foreign regulatory authorities or foreign regulatory authorities may fail to approve
facilities of third-party manufacturers with which we contract for clinical and commercial supplies;

we or any third-party service providers may be unable to demonstrate compliance with current good manufacturing practices (cGMPs) and/or
good clinical practices (GCPs) to the satisfaction of the FDA or foreign regulatory authorities, which could result in delays in regulatory
approval;

the regulations or policies of the FDA or foreign regulatory authorities may change in a manner rendering our clinical data insufficient for
approval;

political factors surrounding the approval process, such as government shutdowns, political instability or global pandemics such as the outbreak
of the novel strain of coronavirus, COVID-19; or

we may be unable to fully enroll or otherwise complete our MOMENTUM Phase 3 clinical trial due to the COVID-19 pandemic.

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Even if momelotinib were to be approved by the FDA or foreign regulatory authorities, any approval might contain significant limitations related to use
restrictions for specified patient populations, age groups, warnings, precautions or contraindications, or may be subject to burdensome post-approval study
or risk management requirements. If we are unable to obtain regulatory approval for momelotinib or any future product candidate in one or more
jurisdictions, or if any approval contains significant limitations, we may not be able to obtain sufficient funding or generate sufficient revenue to continue
the development, marketing or commercialization of momelotinib or any future product candidate. If competitive products developed by third parties show
significant benefit in the indications in which we are developing momelotinib, any planned supportive or primary registration trials may be delayed, altered,
terminated or not initiated and any future product candidates may never receive regulatory approval. Our clinical development programs for momelotinib
or any future product candidates may also not receive regulatory approval if we have inadequate financial or other resources to advance these product
candidates through the clinical trial process. Furthermore, even if we obtain regulatory approval for momelotinib or any future product candidates, we will
still need to develop sales, marketing and commercialization infrastructure, or collaborate with a third party for the commercialization of such product
candidates, establish commercially viable pricing and obtain approval for coverage and adequate reimbursement from third parties, including government
payors. If we are unable to successfully commercialize momelotinib or any future product candidate, we may not be able to generate sufficient revenues to
continue our business.

If further preclinical development or clinical trials of momelotinib, or any other future product candidates that we may develop or acquire fail to
demonstrate acceptable safety and efficacy or do not otherwise produce positive results, we may incur additional costs or experience delays in
completing, or ultimately be unable to complete, the development and commercialization of current or future product candidates.

Before obtaining marketing approval from regulatory authorities, including the FDA, for the sale of momelotinib or any future product candidates, we must
complete preclinical development and conduct extensive clinical trials to demonstrate the safety and efficacy of such product candidates in humans.

The outcome of preclinical testing and early clinical trials may not be predictive of the success of later preclinical testing and clinical trials, and interim
results of a clinical trial do not necessarily predict final results. Many companies in the biotechnology industry have suffered significant setbacks in later-
stage clinical trials after achieving positive results in early-stage development, and there is a high failure rate for product candidates proceeding through
clinical trials. Product candidates in later stages of clinical trials may fail to show the desired safety and efficacy traits despite having progressed through
preclinical studies and initial clinical trials. For example, in June 2016, we announced that we decided to suspend the development of our former lead
product candidate PNT2258 after an interim analysis of data from a Phase 2 clinical trial of PNT2258 indicated only modest efficacy. We cannot guarantee
that we will be successful in obtaining the required efficacy and safety profile from momelotinib, or any future product candidate. A failure of one or more
preclinical studies or clinical trials can occur at any stage of testing.

We previously acquired from Gilead momelotinib, a potent, selective and orally-bioavailable JAK1, JAK2 and ACVR1 inhibitor. Momelotinib has been
investigated in two completed Phase 3 trials for the treatment of myelofibrosis, SIMPLIFY-1 and SIMPLIFY-2. Based on the results of the prespecified
analyses, neither trial was considered sufficiently compelling to justify the submission of an application for regulatory approval. Although SIMPLIFY-1
met its primary efficacy endpoint of non-inferior spleen volume reduction, it did not meet its key secondary efficacy endpoint of non-inferior reduction in
total symptom score; and although SIMPLIFY-2 did not meet its primary efficacy endpoint of superior reduction in spleen volume, it did meet its key
secondary efficacy endpoint of superior reduction in total symptom score. In both SIMPLIFY studies, additional secondary endpoints related to transfusion
independence rate, transfusion dependence rate, and rate of red blood cell transfusions all favored momelotinib over control and supported the potential for
momelotinib to provide meaningful anemia benefits. Based on post hoc analyses of the data for these trials that we subsequently conducted, we believe the
trials showed promising substantive spleen and constitutional symptom control. In addition, we believe momelotinib has the potential to provide a
differentiated therapeutic profile encompassing anemia-related benefits. As such, we have determined that there is substantial clinical justification for
further development of momelotinib. However, while we believe the safety and efficacy profile of momelotinib in patients with myelofibrosis appears
promising based on the prior Phase 3 trial results, the MOMENTUM Phase 3 trial we recently commenced in those patients may not be successful. This
could occur for a variety of reasons related to efficacy or safety outcomes observed in the trial or to issues related to study conduct or study feasibility,
including, but not limited to the following:

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failure to identify sufficient countries willing to import and sites equipped to handle the active comparator danazol, a controlled substance in
some countries;

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delays in initiation and execution of the study in certain countries due to momelotinib and/or controlled substance danazol manufacturing,
labeling, shipping and distribution logistical challenges;

failure to enroll or retain sufficient numbers of subjects because of competing studies, complexity of study design and/or the potential for
patients to be randomized to the danazol-comparator arm;

delays in initiation of trial sites due to implementation of privacy and data protection legislation;

delays in initiation of trial sites or enrollment of patients due to the COVID-19 pandemic;

issues with data retention due to lack of adherence to privacy and data protection legislation;

delays in study initiation due to the collection of the primary endpoint data via patient reported outcomes on an electronic device, which
requires questionnaire licensing, language translation and programming to support the global study;

failure to collect sufficient primary endpoint data for the study given its source of patient reported outcomes, including due to patients not
accurately or consistently reporting their primary endpoint data or the device itself experiencing technical issues that result in inadequate
primary data collection;

failure to demonstrate sufficiently improved efficacy over the comparator arm of danazol either because momelotinib’s efficacy in the trial is
less robust than expected or because danazol performs better than expected, given danazol’s limited data availability, on the efficacy endpoints;
the SIMPLIFY-1 Phase 3 trial, for example, conducted by Gilead in ruxolitinib-naive patients did not demonstrate non-inferiority to its
comparator arm of ruxolitinib for the key secondary endpoint of total symptom score; and

failure to observe meaningful anemia benefits in our planned Phase 3 trial, which could reduce the potential future value of momelotinib as we
believe an anemia benefit could potentially provide a competitive advantage over existing therapies.  

Additionally, the results of MOMENTUM could be altered, or the trial results could be difficult to interpret, if there is inadvertent unblinding of the
treatment assignment of subjects prior to the subject being evaluable for the primary efficacy endpoint or if too many subjects drop out of the study or
discontinue the randomized study treatment prior to the subject being evaluable for the primary endpoint. Although danazol, the comparator selected for
use in this trial, is not approved for the treatment of myelofibrosis, it is recommended by myelofibrosis guidelines as a treatment option for myelofibrosis
associated anemia. Danazol’s ability to control myelofibrosis disease manifestations may not be sufficient, and thus subjects randomized to the danazol arm
may experience symptomatic deterioration which may increase the risk of inadvertent unblinding, early study discontinuation and/or early discontinuation
of randomized treatment. Similarly, momelotinib may also not sufficiently control myelofibrosis disease manifestations in all subjects randomized to the
momelotinib arm, and thus subjects in either treatment arm may also be at risk for early discontinuation.  

Moreover, preclinical and clinical data are often susceptible to varying interpretations and analyses, and even if the trials are successfully completed, we
cannot guarantee that the FDA or foreign regulatory authorities will interpret the results as we do, and more trials could be required before we submit
momelotinib for approval. Many companies that have believed their product candidates performed satisfactorily in preclinical studies and clinical trials
have nonetheless failed to obtain marketing approval of their products. To the extent that the results of our studies and trials are not satisfactory to the FDA
or foreign regulatory authorities for support of a marketing application, approval of momelotinib may be significantly delayed, or we may be required to
expend significant additional resources, which may not be available to us, to conduct additional trials in support of potential approval of momelotinib.

We may experience numerous unforeseen events during, or as a result of, preclinical studies and clinical trials that could delay or prevent our ability to
receive marketing approval or commercialize momelotinib, including, but not limited to:

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undesirable side effects or other unexpected characteristics of momelotinib, causing us or our investigators, regulators or IRBs to suspend or
terminate the trials;

regulators or IRBs may not authorize us or our investigators to initiate a clinical trial, conduct a clinical trial at a prospective trial site, or amend
a clinical trial;

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government or regulatory delays and changes in regulatory requirements, policy and guidelines, including as a result of the COVID-19
pandemic;

delays in reaching or failure to reach agreement on acceptable clinical trial contracts or clinical trial protocols with prospective trial sites and
contract research organizations (CROs), or failure by such CROs or trials sites to carry out the clinical trial in accordance with the terms of our
agreements with them;

negative or inconclusive results of preclinical studies or clinical trials;

decision by us to conduct additional preclinical studies or clinical trials or abandon product development programs;

a higher number of patients being required for clinical trials, slower than expected enrollment, greater than expected competition for patients or
higher than expected drop out rates;

clinical sites electing to terminate their participation in one of our clinical trials, which would likely have a detrimental effect on subject
enrollment;

delays or difficulties with respect to our clinical trials as a result of the COVID-19 pandemic, such as delays in clinical site initiations and the
enrollment of patients in our clinical trials, including difficulties in recruiting clinical site investigators and clinical site staff, as well as delays
or difficulties in the distribution of clinical trial materials, study monitoring and data analysis;

failure of third-party contractors to comply with regulatory requirements or meet their contractual obligations to us in a timely manner, or at all;

inability or unwillingness of patients or medical investigators to follow our clinical trial protocols;

suspension or termination of clinical trials for various reasons, including unacceptable health risks;

imposition of a clinical hold for safety reasons or following an inspection of our clinical trial operations or site by the FDA or foreign
regulatory authorities;

greater than expected cost of clinical trials;

insufficient supply or quality of momelotinib or other materials, necessary to conduct clinical trials;

failure to obtain sufficient quantities of the comparator drug danazol, in view of its current global shortage to complete the trial as planned;

FDA rejecting or disagreeing with our statistical plan;

FDA disagreeing with the interpretation of our clinical data;

delays or additional costs as a result of the United Kingdom’s decision to leave the European Union and resulting need to decouple the United
Kingdom’s regulatory system from that of the European Union; and

revision of legal or regulatory requirements for approving momelotinib.

If we are required to conduct additional preclinical studies or clinical trials or other testing of momelotinib beyond those that we currently contemplate, if
we are unable to successfully complete preclinical studies and clinical trials of momelotinib or other testing, or if the results of these studies, trials or tests
do not reflect an acceptable safety or efficacy profile, we may:

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be delayed or unable to submit additional CTAs or equivalents in one or more countries;

not have the permission of the FDA or other health authorities to commence clinical trials, or may have a clinical hold placed on one or more of
our clinical trials;

be delayed in obtaining marketing approval;

not obtain marketing approval at all;

obtain marketing approval in some countries and not in others;

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obtain approval for indications or patient populations that are not as broad as intended or desired;

obtain approval with labeling that includes significant use or distribution restrictions or safety warnings, including boxed warnings;

be subject to additional post-marketing testing requirements; or

have the product removed from the market after obtaining marketing approval.

Product development costs will also increase if we experience delays in testing or marketing approvals. We do not know whether any preclinical studies or
clinical trials will continue as planned, will need to be restructured or will be completed on schedule, or at all. Significant preclinical studies and clinical
trial delays also could allow our competitors to bring products to market before we do and could impair our ability to successfully commercialize
momelotinib, any of which may harm our business and results of operations.

The outbreak of COVID-19, or similar public health crises, could have a material adverse impact on our business, financial condition and results of
operations, including the execution of our clinical trials and the use and sufficiency of our existing cash.

The extent to which COVID-19 impacts our business and operating results will depend on future developments that are highly uncertain and cannot be
accurately predicted, including new information that may emerge concerning COVID-19 and the actions to contain the virus or treat its impact.

For instance, our MOMENTUM Phase 3 clinical trial for momelotinib has been and may continue to be affected by the pandemic. We launched
MOMENTUM in the fourth quarter of 2019 and site initiation, participant recruitment and enrollment, participant dosing, distribution of clinical trial
materials, study monitoring and data analysis have been and may be delayed due to changes in hospital or university policies, federal, state or local
regulations, prioritization of hospital resources toward pandemic efforts, or other reasons related to the pandemic. Additionally, some participants and
clinical investigators may not be able to comply with clinical trial protocols. For example, quarantines or other travel limitations (whether voluntary or
required) may impede participant movement, affect sponsor access to study sites, or interrupt healthcare services, and we may be unable to conduct our
clinical trial. We have adopted mitigation strategies, but if the global effort to control the spread of COVID-19 and treat COVID-19 patients continues on
the current trajectory for an extended period of time, we risk a delay in activating sites and enrolling subjects as previously projected. Any such delays to
our planned MOMENTUM timeline could also impact the use and sufficiency of our existing cash reserves, and we may be required to raise additional
capital earlier than we had previously planned. We may be unable to raise additional capital if and when needed, which may result in further delays or
suspension of our development plans. Challenging and uncertain economic conditions can make capital raising costly and dilutive.  

We currently utilize third parties to, among other things, manufacture raw materials, momelotinib and danazol (the comparator in the MOMENTUM trial),
components, parts, and consumables, perform quality testing and distribute drug product. If either we or any third-party in the supply chain for materials
used in the production of momelotinib or danazol, are adversely impacted by restrictions resulting from the COVID-19 pandemic, our supply chain may be
disrupted, limiting our ability to source drug substance and drug product for our clinical trials.

Further, infections and deaths related to COVID-19 are disrupting certain healthcare and healthcare regulatory systems globally. Such disruptions could
divert healthcare resources away from, or materially delay review by, the FDA and comparable foreign regulatory agencies. As a result of the FDA’s
updated industry guidance for conducting clinical trials issued on March 18, 2020, we may experience delays in or temporary suspension of the enrollment
of patients in our ongoing clinical trials. Based on these and new regulatory guidance, we may be required to make certain adjustments to our clinical trials,
which could delay the submission of our NDA and regulatory approval and increase our costs. It is unknown how long these disruptions could continue,
were they to occur. Any elongation or de-prioritization of our clinical trial or delay in regulatory review resulting from such disruptions could materially
adversely affect the development and study of momelotinib. COVID-19 may also impact the resources and the availability of FDA to provide feedback and
regulatory review or to conduct pre-approval inspections on a timely basis, which will delay our regulatory approval and increase our costs.

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In response to the COVID-19 pandemic, we have closed our office with our employees continuing their work outside of our office. In the event of a shelter-
in-place order or other mandated local travel restrictions, third parties conducting clinical or manufacturing activities may not be able to access laboratory
or manufacturing space, and our core activities may be significantly limited or curtailed, possibly for an extended period of time.

The spread of COVID-19, which has caused a broad impact globally, including restrictions on travel and quarantine policies put into place by businesses
and governments, may have a material adverse effect on our business. While the potential economic impact brought by and the duration of the pandemic
may be difficult to assess or predict, it has already caused, and is likely to result in further, significant disruption of global financial markets and the trading
prices for our common stock and other biopharmaceutical companies have been highly volatile as a result of the COVID-19 pandemic, which may reduce
our ability to access capital either at all or on favorable terms. In addition, a recession, depression or other sustained adverse market event resulting from
the global effort to control COVID-19 infections could materially and adversely affect our business and the value of our common stock.

The ultimate impact of the current pandemic, or any other health epidemic, is highly uncertain and subject to change. We do not yet know the full extent of
potential delays or impacts on our business, our clinical trials, healthcare systems or the global economy as a whole. However, these effects could have a
material adverse impact on our operations, and we will continue to monitor the situation closely. To the extent the COVID-19 pandemic adversely affects
our business and financial results, it may also have the effect of heightening many of the other risks described in this “Risk Factors” section.

If we encounter difficulties enrolling patients in our clinical trials, our clinical development activities could be delayed or otherwise adversely affected.

We may experience difficulties in patient enrollment in our clinical trials for a variety of reasons. The Phase 3 MOMENTUM trial may be especially
difficult to enroll because the trial is blinded and because the comparator arm does not contain a JAK inhibitor. The timely completion of clinical trials in
accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the trial until its
conclusion. The enrollment of patients depends on many factors, including, but not limited to:

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the number and size of clinical trials for other product candidates in the same therapeutic area that are currently in clinical development, and
our ability to compete with such trials for patients and clinical trial sites;

the patient eligibility criteria defined in the protocols;

the size of the specific patient populations such as those whose tumors harbor the applicable genetic mutations, if required or other defined
subsets of a larger patient population;

the risk that disease progression will result in death or clinical deterioration before the patient can enroll in clinical trials or before sufficient
data has been collected such that the patient contributes no meaningful information for the clinical trial in which the patient is enrolled;

the proximity and availability of clinical trial sites for prospective patients;

the design of the trials, including the inclusion of a placebo or comparator arm in a trial;

our ability to recruit clinical trial investigators with the appropriate competencies and experience;

our ability to obtain and maintain patient consents;

the risk that patients enrolled in clinical trials will drop out of the trials before completion; and

delays and difficulties in enrollment or patient retention in the trial due to the COVID-19 pandemic.

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Our clinical trials compete with other clinical trials for product candidates that are in the same therapeutic areas as momelotinib. This competition reduces
the number and types of patients and qualified clinical investigators available to us, because some patients who might have opted to enroll in our trials may
instead opt to enroll in a trial being conducted by one of our competitors or clinical trial sites may not allow us to conduct our clinical trial at such site if
competing trials are already being conducted there. Since the number of qualified clinical investigators is limited, we expect to conduct some of our clinical
trials at the same clinical trial sites that some of our competitors use, which will reduce the number of patients who are available for our clinical trials in
such clinical trial site. We may also encounter difficulties finding a clinical trial site at which to conduct our trials. Moreover, because momelotinib is
experimental, potential patients and their doctors may be inclined to use conventional therapies, such as chemotherapy, radiation and other approved
therapies, rather than enroll patients in any one of our clinical trials. Global pandemics, such as COVID-19, have negatively affected site initiation, as well
as recruitment and retention, at sites in regions or cities whose health care system have become overwhelmed due to the pandemic. For example, as a result
of COVID-19, several of our clinical trial sites have paused enrollment or are not prioritizing clinical trial activities or allowing enrollment, and of those
sites still conducting clinical trial activities, the availability for patients to visit sites and have screening conducted may be limited. We may also experience
delays or pauses in the delivery of required site activity equipment.  

Delays in patient enrollment may result in increased costs or may affect the timing or outcome of our planned clinical trials, which could prevent
completion of these clinical trials and adversely affect our ability to advance the development of momelotinib or any future product candidates we may
develop.

We will need to acquire additional capital to complete the development and commercialization of momelotinib and any future product candidates.

We expect to spend substantial capital to advance momelotinib or any future product candidates, in preclinical and clinical development, seek regulatory
approvals for such product candidates, establish a commercial sales force to market and manufacture products, if any, that are approved for commercial
sale. We also incur significant compliance and administrative costs as a result of operating as a public company.

Our future capital requirements will depend on many factors, including, but not limited to:

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the progress and results of our MOMENTUM Phase 3 trial and our other planned preclinical studies and clinical trials;

the scope, progress, results and costs of product candidate discovery, preclinical development, laboratory testing and clinical trials for our
current and future product candidates;

the costs, timing and outcome of regulatory review of momelotinib and any other future product candidates;

the costs of medical affairs and pre-commercialization activities, including regulatory and reimbursement analysis and market research;

the costs of future commercialization activities, including drug sales, marketing, manufacturing and distribution, for momelotinib or any future
product candidates for which we receive marketing approval, to the extent that such sales, marketing, manufacturing and distribution are not the
responsibility of any collaborator;

the extent to which we acquire or in-license other drugs and technologies, or to which we out-license our own products and technologies;

the extent to which we acquire or invest in business, products or technologies, although we currently have no commitments or agreements
relating to any of these types of transactions;

the extent to which we are able to enter into strategic partnerships and alliances or licensing arrangements with third parties for the
commercialization of momelotinib in certain global regions;

our ability to establish and maintain collaborations on favorable terms, if at all;

the success of any collaborations that we may enter into with third parties;

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the timing and amount of milestone and royalty payments;

the amount of revenue, if any, received from commercial sales of momelotinib or any future product candidates, should any such product
candidates receive marketing approval;

the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending
intellectual property-related claims; and

the compliance and administrative costs associated with being a public company.

Identifying potential product candidates and conducting preclinical studies and clinical trials is a time-consuming, expensive and uncertain process that
takes years to complete, and we may never generate the necessary data or results required to obtain marketing approval and achieve drug sales. In addition,
momelotinib, if approved, may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of momelotinib, if approved,
which we do not expect to be commercially available for many years, if at all. Accordingly, we will need to continue to rely on additional financing to
achieve our business objectives.  

We cannot be certain that additional funding will be available on acceptable terms, or at all. We have no committed source of additional capital, other than
our outstanding warrants, and it may be difficult to raise the amount of capital needed to support planned development of momelotinib. If we are unable to
raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back or discontinue the development or
commercialization of momelotinib or other research and development initiatives. In particular, we do not have sufficient funds on hand to adequately
prepare for future momelotinib commercialization, if approved. We could also be required to seek collaborators for momelotinib, at an earlier stage than
otherwise would be desirable or on terms that are less favorable than might otherwise be available or relinquish or license on unfavorable terms our rights
to such product candidates in markets where we otherwise would seek to pursue development or commercialization ourselves. We also may be unable to
acquire additional promising product candidates.

We have acquired momelotinib from a third party that had already conducted or was in the process of conducting clinical trials. Our acquisition of
momelotinib has resulted in us being required to take over responsibility for conducting ongoing momelotinib trials. We may discover that development
efforts of the third parties, including but not limited to historical studies and trials conducted by third parties, did not comply with all applicable rules
and regulations. Further development and commercialization of momelotinib will require significant financial and operational resources from us.

Prior to our acquisition of momelotinib, third parties had been responsible for all development activities including, drug process, preclinical and clinical
development activities, submission of CTAs and INDs, development of the trial protocols, establishment and management of clinical and safety databases,
submission of a pediatric investigation plan (PIP), and other activities. Although we believe the historical development activities were conducted in
accordance with applicable rules and regulations in material respects, we cannot assure you that we will not discover inaccuracies or noncompliance in
prior development activities that have an adverse effect on the future development of momelotinib. For example, a regulatory authority may choose to
inspect an investigational site and/or vendor such as a CRO for a momelotinib study that was previously conducted by Gilead such as the SIMPLIFY-1 or
SIMPLIFY-2 studies. Findings from such inspections could have an impact on the review of any future marketing applications by the FDA or foreign
regulatory authorities.

In connection with our acquisition of momelotinib, we have assumed the responsibility for ongoing clinical studies with momelotinib, including related
expenses and manufacturing and regulatory activities, which were previously managed and funded by Gilead. This includes responsibility for the ongoing
extended access study, which provides extended access of momelotinib to certain patients previously enrolled in Gilead-sponsored studies, who are
currently receiving treatment with momelotinib and have not experienced progression of disease. Further, extended access programs provide supportive
safety information for regulatory review. Any adverse events or reactions experienced by subjects in the extended access program may be attributed to
momelotinib and may limit our ability to obtain regulatory approval with labeling that we consider desirable, or at all.

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From time to time we may amend the clinical protocols for momelotinib to include additional objectives that could yield important scientific
information critical to our overall development strategy. The protocol amendment process requires review and approval by several review bodies,
including regulatory agencies and scientific, regulatory and ethics boards. These protocol amendments may not be accepted by the review bodies in the
form submitted, or at all, which may delay our planned enhancements to the clinical development program and/or limit or change the type of
information we may gather from those studies.

While regulatory feedback was obtained concerning the design of our Phase 3 clinical trial for momelotinib from both the United States and European
Union regulatory authorities, additional regulatory, scientific, ethics committee, and possibly other reviews will be required during the activation process
for the MOMENTUM Phase 3 trial before the protocol is active at any particular site. It is possible that these reviews could require changes to the design of
the study. If the FDA, EMA, MHRA, an ethics committee or scientific review board, or another regulatory authority objects to or otherwise does not accept
or approve any future protocols or protocol amendments or requires us to further modify trial protocols, our related planned clinical development program
may be delayed or suspended and/or we may not be able to gather information we think would be useful to advance development of momelotinib, and our
development program may be adversely affected.

Raising additional capital may cause dilution to our existing stockholders, restrict our operations or require us to relinquish rights to our technologies
or momelotinib.

We may seek additional capital through a combination of public and private equity offerings, debt financings, strategic partnerships and alliances and
licensing arrangements. In November 2019 we conducted a public equity offering where we raised net proceeds of approximately $97.7 million in a
substantially dilutive transaction to our pre-existing investors. In August 2020, we filed a prospectus supplement pursuant to which we can issue and sell an
aggregate of up to $20.0 million of our common stock from time to time in ATM offerings. During the year ended December 31, 2020, we sold 732,752
shares under the ATM program for net proceeds of $8.9 million, net of commissions and offering expenses. In January 2021, we sold an additional 450,000
shares under the ATM program for proceeds of $7.1 million, net of commissions. In addition, in February 2021, we filed a prospectus supplement pursuant
to which we can issue and sell an aggregate of up to $30.0 million of our common stock from time to time in ATM offerings. To the extent that we raise
additional capital through the sale of equity or convertible debt securities, the ownership interests of our stockholders will be further diluted, and the terms
may include liquidation or other preferences that adversely affect the rights of our stockholders. The incurrence of indebtedness would result in increased
fixed payment obligations and could involve certain restrictive covenants, such as limitations on our ability to incur additional debt, limitations on our
ability to acquire or license intellectual property rights and other operating restrictions that could adversely impact our ability to conduct our business. If we
raise additional funds through strategic partnerships and alliances and licensing arrangements with third parties, we may have to relinquish valuable rights
to our technologies or momelotinib or grant licenses on terms unfavorable to us.

We may expend our limited resources to pursue a particular product candidate, such as momelotinib, and fail to capitalize on product candidates that
may later prove to be more profitable or for which there is a greater likelihood of success. In addition, we may intentionally halt or terminate programs
in order to conserve capital and focus on our remaining program or programs, which may increase our reliance on those programs to be successful.  

Because we have limited financial and managerial resources, we focus our research and development efforts on our product candidate, momelotinib. As a
result, we may advertently or inadvertently forgo or delay pursuit of opportunities with other product candidates, including SRA737, that later prove to
have greater commercial potential. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market
opportunities. Our spending on current and future research and development programs and product candidates for specific indications may not yield any
commercially viable product candidates. In addition, if we halt or terminate programs in order to conserve capital and focus on our remaining program or
programs, it may increase our reliance on the success of such programs and raise our exposure to the risk of failure among any of our programs.

41

While we have currently deprioritized development of SRA737, we are exploring options for future development of this product candidate, if any.
However, there can be no assurance that we will successfully obtain development support or the funding necessary to advance SRA737 on commercially
reasonable terms, or at all. If we are unable to obtain such support or funding, we may need to permanently cease development of SRA737.

If we do not achieve our projected development goals in the timeframes we announce and expect, our stock price may decline.

From time to time, we estimate the timing of the anticipated accomplishment of various scientific, clinical, regulatory and other product development goals,
which we sometimes refer to as milestones. These milestones may include the commencement or completion of scientific studies and clinical trials and the
submission of regulatory filings. From time to time, we may publicly announce the expected timing of some of these milestones. All of these milestones are
and will be based on numerous assumptions. The actual timing of these milestones can vary dramatically compared to our estimates, in some cases for
reasons beyond our control. If we do not meet these milestones as publicly announced, our stock price may decline.

The manufacture of momelotinib and the comparator, danazol requires outsourced, custom manufacturing and we may encounter difficulties in
production, particularly with respect to formulation, process development or scaling up of our manufacturing capabilities. If our third-party
manufacturers or suppliers encounter such difficulties, our ability to provide supply of momelotinib for preclinical studies, clinical trials or our
products for patients, if approved, or danazol for the MOMENTUM trial could be delayed or stopped, or we may be unable to maintain a commercially
viable cost structure.

As product candidates are developed, it is common that various aspects of the development program, such as manufacturing methods, are altered along the
way in an effort to optimize processes and results. Such changes carry the risk that they will not achieve these intended objectives, and any of these changes
could cause momelotinib to perform differently and affect the results of planned preclinical studies or future clinical trials.

Currently, momelotinib is manufactured using an optimized drug substance process by third-party manufacturers. If either we or any third-party in the
supply chain for materials used in the production of momelotinib are adversely impacted by restrictions resulting from the COVID-19 outbreak, our supply
chain may be disrupted, limiting the ability of our third-party manufacturers to manufacture momelotinib for our clinical trials.

Supply chain logistics are complex for the MOMENTUM Phase 3 clinical trial of momelotinib, as it requires the administration of both an active drug
(momelotinib) and a comparator (danazol) and there are risks associated with this process throughout the supply chain, from manufacturing, labeling, to
distribution, dispensing, and administration. Although we have secured sufficient quantities of drug substance and drug product to supply our current
momelotinib program, starting with the MOMENTUM Phase 3 clinical trial of momelotinib, we will need to obtain additional supplies from third-party
manufacturers that we have engaged, or expect to engage. We have also secured sufficient quantities of danazol drug product to supply the comparator for
the initial subjects who will enroll in the study. However, additional sourcing of danazol will be necessary in the future in order to complete the
MOMENTUM Phase 3 clinical trial. Currently, there is a global shortage of danazol. We will need to obtain additional supplies from third-party
manufacturers that we have engaged or expect to engage. We are also working with regulatory agencies to extend the shelf life of our current supply of
danazol to ensure that our current supply will not expire before we complete our Phase 3 clinical trial. Simultaneously, we are also working with our
current supplier to manufacture more danazol. While we are taking multiple measures to ensure sufficient supply of danazol required to complete the Phase
3 trial, we could nevertheless face challenges that potentially impact the ability to execute and complete the MOMENTUM trial as we anticipate. Any
shortage in the clinical supplies could delay our clinical trial plan.

Furthermore, if third-party manufacturers of danazol, or any third-party in the supply chain, are adversely impacted by restrictions resulting from the
COVID-19 outbreak, we may be unable to secure the supply required for our MOMENTUM study. Any potential limitation in supply of either
momelotinib or danazol during the conduct of the MOMENTUM trial could be exacerbated due to the use of several regional depots and the number of
sites that are participating in the study. Drug is shipped to sites as they enter a patient into screening. If the rate of screening exceeds expectations, there
could be logistic challenges in refilling the supply at the depot. Although additional drug

42

product could be shipped from another regional depot, logistic challenges could delay this as well. If the supply in a regional depot becomes depleted,
screening in that region might need to be temporarily suspended until the supply is replenished. Although we are working to develop commercially viable
manufacturing processes, doing so is a difficult and uncertain task, and there are risks associated with scaling to the level required for advanced clinical
trials or commercialization, including, among others, cost overruns, potential problems with process scale up or formulation, process reproducibility,
stability issues, lot consistency and timely availability of reagents or raw materials.

Any of these challenges could delay completion of preclinical studies or clinical trials, require bridging studies or trials, or the repetition of one or more
studies or trials, increase development costs, delay approval of momelotinib, impair commercialization efforts, increase our cost of goods and have an
adverse effect on our business, financial condition, results of operations and growth prospects.

Our reliance on third-party manufacturing partners or suppliers may cause our supply of research and development, preclinical and clinical
development materials to become limited or interrupted or fail to be of satisfactory quantity or quality.

We do not have any manufacturing facilities or personnel. We currently rely, and expect to continue to rely, on third parties for the manufacture and supply
of preclinical study and clinical trial materials in relation to momelotinib, including materials for any combination trials that we may undertake, and any
future potential product candidates that we may develop for preclinical and clinical testing, as well as for commercial manufacture if momelotinib receives
marketing approval. We have engaged, or expect to engage, third-party manufacturers to obtain materials and consumables necessary for the manufacture
of momelotinib.

We may be unable to establish further agreements with third-party manufacturers and suppliers or to do so on acceptable terms. Even if we are able to
establish agreements with third-party manufacturers, reliance on third-party manufacturers and suppliers entails additional risks, including, but not limited
to:

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reliance on the third party for sufficient quantity and quality;

the possible breach of the manufacturing or supply agreement by the third party;

failure to manufacture or supply the product according to our specifications;

failure to manufacture or supply the product according to our schedule or at all;

the possible mislabeling of clinical supplies, potentially resulting in the wrong dose amounts being supplied or active drug or comparator not
being properly identified;

misappropriation of our proprietary information, including our trade secrets and know-how;

the possible termination or nonrenewal of the agreement by the third party at a time that is costly or inconvenient for us;

the possibility of clinical supplies not being delivered to clinical sites on time, leading to clinical trial interruptions; and

the reliance on the third party for regulatory compliance, quality assurance and safety reporting.

While we require our third-party manufacturers and suppliers to comply with cGMPs in the manufacture of clinical trial materials and commercial supply,
should we obtain approval of momelotinib, these third-party manufacturers and suppliers may cease to continue to comply with cGMPs—which are FDA
requirements for ensuring product quality control—or similar regulatory requirements outside the United States. Our contract manufacturers and suppliers
are subject to continual review and periodic inspections to assess compliance with cGMPs. Accordingly, although we are not involved in the day-to-day
operations of our contract manufacturers or suppliers, we are ultimately responsible for ensuring that our products and product candidates, and any other
materials that may be used in our preclinical or clinical studies or trials, are manufactured or supplied in accordance with cGMPs. Therefore, we and others
with whom we work must continue to expend time, money and effort in all areas of regulatory compliance, including manufacturing, production, quality
control and quality assurance. Our failure, or the failure of our third-party manufacturers or suppliers, to comply with applicable regulations could result in
momelotinib not being approved or sanctions being imposed on us, including fines, injunctions, civil penalties, delays, suspension or withdrawal of
approvals, license revocation, seizures or recalls of momelotinib or approved products, operating restrictions and criminal prosecutions, any of which could
significantly and adversely affect supplies of our medicines and harm our business and results of operations.

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Additionally, our third-party manufacturers may experience manufacturing difficulties due to resource constraints or as a result of labor disputes, or
unstable political environments, or medical pandemics such as the COVID-19 outbreak. For example, many of our raw materials for manufacture of
momelotinib are produced in Asia which could impact our ability to manufacture and supply material for clinical and commercial supply. If our contract
manufacturers were to encounter any manufacturing difficulties or delays due to these factors, our ability to provide momelotinib to patients in clinical
trials, or to provide product for treatment of patients once approved, would be jeopardized.

We rely on third-party suppliers for the supply of the raw materials required for the production of our product candidates, and we expect to some extent
continue to rely on third-party manufacturers for the commercial supply of any of our product candidates for which we obtain marketing approval. Our
dependence on these third-party suppliers and the challenges we may face in obtaining adequate supplies of raw materials involve several risks, including
limited control over pricing, availability, quality, and delivery schedules and non-exclusivity. As a small company, our negotiation leverage is limited, and
we are likely to get lower priority than our competitors who are larger than we are. We do not have long-term supply agreements, and we purchase our
required supplies on a development manufacturing services agreement or purchase order basis. We cannot be certain that our suppliers will continue to
provide us with the quantities of these raw materials that we require to satisfy our anticipated specifications and quality requirements. Any supply
interruption in limited or sole sourced raw materials could materially harm our ability to manufacture our product candidates until a new source of supply,
if any, could be identified and qualified. We may be unable to find a sufficient alternative supply channel in a reasonable time or on commercially
reasonable terms. Any performance failure on the part of our suppliers could delay the development and potential commercialization of our product
candidates, including limiting supplies necessary for clinical trials and regulatory approvals, which would have a material adverse effect on our business.

Any performance failure on the part of our existing or future manufacturers or suppliers, any interruption or poor yield or quality of manufactured or
supplied materials, or any interruption or delay caused by a third party being subject to governmental regulations or moratoriums could result in additional
costs, not having sufficient quantities or sufficient quality and may delay, prevent or impair our development, commercialization or marketing efforts. We
do not currently have arrangements in place for redundant supply. If any one of our current contract manufacturers or suppliers cannot perform as agreed,
we may be required to replace that manufacturer or supplier. Although we believe that there are several potential alternative manufacturers or suppliers who
could manufacture or supply momelotinib or the materials for trials relating to momelotinib, we may incur added costs and delays in identifying and
qualifying any such replacement.

If our third-party manufacturers or suppliers use hazardous and biological materials in a manner that causes injury or violates applicable law, we may be
liable for damages. Our research and development activities involve the controlled use of potentially hazardous substances, including chemical and
biological materials, by our third-party manufacturers or suppliers. Our manufacturers and suppliers are subject to federal, state and local laws and
regulations in the United States governing the use, manufacture, storage, handling and disposal of medical and hazardous materials. Although we believe
that our manufacturers’ and our suppliers’ procedures for using, handling, storing and disposing of these materials comply with legally prescribed
standards, we cannot completely eliminate the risk of contamination or injury resulting from medical or hazardous materials. As a result of any such
contamination or injury, we may incur liability or local, city, state or federal authorities may curtail the use of these materials and interrupt our business
operations. In the event of an accident, we could be held liable for damages or penalized with fines, and the liability could exceed our resources. We do not
have any insurance for liabilities arising from medical or hazardous materials. Compliance with applicable environmental laws and regulations is
expensive, and current or future environmental regulations may impair our research, development and production efforts, which could harm our business,
prospects, financial condition or results of operations.

Thus, our current and anticipated future dependence upon others for the manufacture or supply of momelotinib or related medicines and materials may
adversely affect our development timeline, our future profit margins or our ability to commercialize momelotinib or any future product candidates that
receive marketing approval on a timely and competitive basis.

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Our product candidates including momelotinib may cause undesirable side effects or have other properties that could halt their development, prevent
their regulatory approval, limit their commercial potential or result in significant negative consequences.

It is possible that the FDA or foreign regulatory authorities may not agree with any assessment of the safety profile of momelotinib. Undesirable side
effects caused by momelotinib could cause us, IRBs, our CROs, the FDA or foreign regulatory authorities to interrupt, delay or discontinue development
and could result in a clinical hold on any clinical trial, or the denial of regulatory approval by the FDA or foreign regulatory authorities for any or all
targeted indications. This, in turn, could prevent us from commercializing momelotinib and generating revenues from their sale. In addition, if any of our
products cause serious or unexpected side effects or are associated with other safety risks after receiving marketing approval, a number of potential
significant negative consequences could result, including, but not limited to:

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regulatory authorities may withdraw their approval of this product;

we may be required to recall the product, change the way it is administered, conduct additional clinical trials or change the labeling of the
product;

the product may be rendered less competitive and sales may decrease;

our reputation may suffer generally both among clinicians and patients;

we may be exposed to potential lawsuits and associated legal expenses, including costs of resolving claims;

regulatory authorities may require certain labeling statements, such as warnings or contraindications or limitations on the indications for use, or
impose restrictions on distribution in the form of a Risk Evaluation and Mitigation Strategy (REMS) in connection with approval, if any;  

we may be required to change the way the product is administered or conduct additional preclinical studies or clinical trials; or

we may be required to change or stop other ongoing clinical studies that may negatively impact the development of the agent for other
indications.

If preliminary data demonstrate that momelotinib has an unfavorable safety profile and is unlikely to receive regulatory approval or be successfully
commercialized, we may voluntarily suspend or terminate future development of momelotinib.

Any one or a combination of these events could prevent us from obtaining approval and achieving or maintaining market acceptance of the affected product
or could substantially increase the costs and expenses of commercializing momelotinib, which in turn could delay or prevent us from generating significant
revenues from the sale of the product.  

We do not have our own laboratory facilities. We rely on third parties to conduct our preclinical studies and clinical trials. If these third parties do not
successfully carry out their contractual duties or meet expected deadlines, we may not be able to obtain regulatory approval of or commercialize
momelotinib.

We do not have our own laboratory facilities. We depend upon independent investigators and collaborators, such as universities, medical institutions, CROs
and strategic partners to conduct our preclinical studies and clinical trials. We expect to have to negotiate budgets and contracts with CROs and trial sites,
which may result in delays to our development timelines and increased costs. We will rely heavily on these third parties over the course of our preclinical
studies and clinical trials, and we control only certain aspects of their activities. Nevertheless, we are responsible for ensuring that each of our studies is
conducted in accordance with applicable protocol, legal, regulatory and scientific standards, and our reliance on third parties does not relieve us of our
regulatory responsibilities. We and these third parties are required to comply with GCPs and GLPs, which are regulations and guidelines enforced by the
FDA and comparable foreign regulatory authorities for clinical and non-clinical research intended to support a submission or application to FDA or the
comparable foreign authority. Regulatory authorities enforce these requirements through periodic inspections of trial sponsors, principal investigators and
trial sites. If we or any of these third parties fail to comply with applicable requirements, the data generated in our studies and trials

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may be deemed unreliable and the FDA or foreign regulatory authorities may require us to perform additional studies or trials before approving our
marketing applications. We cannot assure you that, upon inspection, such regulatory authorities will determine that any of our studies or trials comply with
the GCP or GLP requirements. In addition, our studies and trials must be conducted with drug product produced under cGMPs. Our failure or any failure
by these third parties to comply with these regulations or to recruit a sufficient number of patients may require us to repeat studies or trials, which would
delay the regulatory approval process. Moreover, our business may be implicated if any of these third parties violates federal or state fraud and abuse or
false claims laws and regulations or healthcare privacy and security laws.

Any third parties conducting our preclinical studies and clinical trials will not be our employees and, except for remedies available to us under our
agreements with such third parties, we cannot control whether or not they devote sufficient time and resources to our ongoing preclinical, clinical and
nonclinical programs. These third parties may also have relationships with other commercial entities, including our competitors, for whom they may also
be conducting clinical studies or other drug development activities, which could affect their performance on our behalf. If these third parties do not
successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the data
they obtain is compromised due to the failure to adhere to our protocols or regulatory requirements or for other reasons, our studies and trials may be
extended, delayed or terminated and we may not be able to complete development of, obtain regulatory approval of or successfully commercialize
momelotinib. As a result, our financial results and the commercial prospects for momelotinib would be harmed, our costs could increase and our ability to
generate revenue could be delayed.

We may be required to suspend, repeat or terminate our clinical trials if they are not conducted in accordance with regulatory requirements, the results
are negative or inconclusive, or the trials are not well-designed.

Regulatory agencies, IRBs or data safety monitoring boards may at any time recommend the temporary or permanent discontinuation of our clinical trials
or request that we cease using investigators in the clinical trials if they believe that the clinical trials are not being conducted in accordance with applicable
regulatory requirements, or that they present an unacceptable safety risk to participants. Clinical trials must be conducted in accordance with GCPs, or
other applicable foreign regulatory authority guidelines. Clinical trials are subject to oversight by the FDA, foreign regulatory authorities and IRBs at the
study sites where the clinical trials are conducted. In addition, clinical trials must be conducted with product candidates produced in accordance with
applicable cGMPs. Clinical trial data may be rejected by the FDA or foreign regulatory authorities or clinical trials may be suspended by the FDA, foreign
regulatory authorities, or us for various reasons, including, but not limited to:

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deficiencies in the conduct of the clinical trials, including failure to conduct the clinical trial in accordance with regulatory requirements or
clinical protocols or to obtain or maintain clinical trial data in accordance with applicable regulatory requirements;

deficiencies in the clinical trial operations or trial sites;

the product candidate may have unforeseen adverse side effects;

deficiencies in the trial designs necessary to demonstrate efficacy;

fatalities or other adverse events (AEs) arising during a clinical trial due to medical problems that may or may not be related to clinical trial
treatments;

the product candidates may not appear to be more effective than current therapies;

the quality or stability of the product candidates may fall below acceptable standards; or

failure to adequately demonstrate study conduct oversight, ensure data integrity, and that clinical study sites complied with the principles of
GCPs.

Although we have never been asked by a regulatory agency, IRB or data safety monitoring board to temporarily or permanently discontinue a clinical trial,
if we elect or are forced to suspend or terminate a clinical trial of momelotinib or any future product candidates, the commercial prospects for that product
will be harmed and our ability to generate product revenue from that product may be delayed or eliminated. For example, in June 2016, we decided to
suspend the development of our former lead product candidate PNT2258 after an interim analysis of data from a Phase 2 clinical trial on PNT2258
indicated only modest efficacy. Furthermore, any of these events could prevent us or our partners from achieving or maintaining market acceptance of the
affected product and could substantially increase the costs of commercializing momelotinib and impair our ability to generate revenue from the
commercialization of these products either by us or by our collaboration partners.

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Even if we receive regulatory approval to market momelotinib, the market may not be receptive to our product.

Even if we obtain regulatory approval for momelotinib, it may not gain market acceptance among physicians, patients, healthcare payors and/or the medical
community. We believe that the degree of market acceptance will depend on a number of factors, including, but not limited to:

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timing of market introduction of momelotinib and competitive product;

safety and efficacy of our product;

prevalence and severity of any side effects;

potential advantages or disadvantages over alternative treatments;

strength of marketing and distribution support;

price of our products, both in absolute terms and relative to alternative treatments;

availability of coverage and reimbursement from government and other third-party payors; and

sequencing of available products.

If momelotinib is approved for commercial sale and fails to achieve market acceptance, we may not be able to generate significant revenue or achieve or
sustain profitability.

We may be subject to requests for access to momelotinib. Demand for compassionate use of our unapproved therapies could strain our resources, delay
our drug development activities, negatively impact our regulatory approval or commercial activities, and result in losses.

We are developing momelotinib to treat a life-threatening illness for which there are currently limited therapeutic options. Other companies in our field
have been the target of campaigns requesting access to unapproved drugs. If we experience similar request for access campaigns, we may experience
significant disruption to our business which could result in losses. We are a small company with limited resources, and any unanticipated trials or access
programs resulting from requests for access could deplete our drug supply, increase our capital expenditures, reduce the availability of potentially eligible
clinical trial participants, and otherwise divert our resources from our primary goals.

In addition, legislation referred to as "Right to Try" laws have been introduced at the local and national levels, which are intended to give patients access to
unapproved therapies. New and emerging legislation regarding expanded access to unapproved drugs for life-threatening illnesses could negatively impact
our business in the future. Either activism or legislation related to requests for access may require us to initiate an unanticipated expanded access program
or to make momelotinib more widely available sooner than anticipated.

Patients who receive access to unapproved drugs through compassionate use or expanded access programs have life-threatening illnesses and generally
have exhausted all other available therapies. The risk for serious adverse events, including those which may be unrelated to momelotinib, in this patient
population is high and could have a negative impact on the safety profile of momelotinib, which could cause significant delays or an inability to
successfully commercialize momelotinib and could materially harm our business. In addition, in order to perform the controlled clinical trials required for
regulatory approval and successful commercialization of momelotinib, we may receive adverse publicity or experience other disruptions if we do not
provide compassionate use access or expanded access programs in response to requests for access from patients in the US or elsewhere in the world.
Should we agree to provide compassionate use access or decide to initiate an expanded access program, we could experience adverse publicity or other
disruptions related to current or potential participants in such programs. Similarly, we could experience adverse publicity or other disruptions if we were to
restructure or pause any compassionate use and/or expanded access program after initiating such a program or after the provision of our product through
compassionate access to an individual patient or patients.  

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We do not have our own laboratory facilities or the ability to discover product candidates. We rely on licensing, acquisition and other forms of strategic
relationship to grow our pipeline. Our efforts to acquire additional product candidates and grow our pipeline may be unsuccessful.

We do not have our own laboratory facilities or the ability to discover product candidates. We rely on licensing, acquisition and other forms of strategic
relationship to grow our pipeline. We may acquire, or enter into strategic relationships to identify, license and develop, one or more additional product
candidates to grow our pipeline. In addition, we may desire to renegotiate our currently existing licensing or asset purchase agreements for any of our
product candidates. The identification, evaluation, development and potential acquisition or licensing of additional product candidates is expensive and
time-consuming, and our efforts may not lead to the acquisition or licensing of any additional product candidates, that can be successfully developed and
commercialized. Competition for viable product candidates is intense, and the acquisition or licensing of product candidates may be more expensive than
we are able to afford or may require us to seek additional financing. If our efforts do not lead to the acquisition or successful identification, development
and licensing of suitable product candidates, we may be unable to grow our pipeline. In addition, if our efforts to grow our pipeline require us to pursue
additional dilutive capital or debt financing strategies, we may experience harm to our financial position and stability.

Even if we are successful in continuing to build our pipeline, the potential product candidates that we identify may not be suitable for clinical development.
For example, they may be shown to have harmful side effects or other characteristics that indicate that they are unlikely to be drugs that will receive
marketing approval and achieve market acceptance. If we do not successfully develop and commercialize product candidates based upon our approach, we
will not be able to obtain product revenue in future periods, which likely would result in significant harm to our financial position and adversely affect our
stock price.

We face significant competition from other hematology and oncology companies, and our operating results will suffer if we fail to compete effectively.

The hematology and oncology industries are characterized by rapidly advancing technologies, intense competition and a strong emphasis on proprietary
products. We may face potential competition from many different sources, including major pharmaceutical, specialty pharmaceutical and biotechnology
companies, academic institutions and governmental agencies and public and private research institutions. Any product candidates that we successfully
develop and commercialize will compete with existing therapies that are available for the indication or indications for which they are approved and new
therapies that may become available in the future.

To our knowledge, there are currently two approved myelofibrosis drugs that specifically rely on JAK inhibition, ruxolitinib, marketed by Incyte
Corporation as Jakafi® in the United States and by Novartis as Jakavi in the rest of the world and fedratinib, marketed by Celgene Corporation as Inrebic®
in the United States. Fedratinib was also recently approved in Europe. In addition, there is one additional JAK inhibitor competitor in clinical development,
at a similar state of development or more advanced than us. CTI Biopharma Corporation is developing pacritinib, for a subset of myelofibrosis patients
with platelet counts less than 50,000/uL and commenced its rolling NDA submission in October 2020. However, to our knowledge, there are no drugs that
target JAK1, JAK2 and ACVR1 on the market, nor in development. Other competitors developing myelofibrosis therapeutics include Acceleron,
Constellation Pharma, AbbVie, Kartos and Incyte. Celgene and Acceleron are developing luspatercept in a Phase 3 clinical trial for myelofibrosis.
Constellation Pharma is developing pelabresib (CPI-0610), a BET inhibitor in Phase 3 clinical trial in combination with ruxolitinib. AbbVie announced two
Phase 3 clinical trials in combination with ruxolitinib for JAKi naïve and previously JAKi treated patients. Kartos announced clinical trial plans for KRT-
232, a MDM2 inhibitor for JAKi relapsed or refractory MF patients. Incyte launched Phase 3 clinical trials to evaluate parsaclisib, in combination with
ruxolitinib. In addition, there are several Phase 1 and Phase 2 clinical trials being conducted in myelofibrosis by various companies, including a Phase 2
study of a deuterated form of momelotinib being run by Zelgen Biopharmaceuticals in China. Several additional companies are advancing assets in the
early stages of development potentially for the myelofibrosis market. If momelotinib is approved, it will compete with existing therapies for the indication
or indications for which it is approved. While we believe that momelotinib may have the ability to provide an anemia benefit in addition to treating the
other manifestations of myelofibrosis, which we believe is unique within the JAK inhibitor class of agents, the market for momelotinib is competitive, and
physicians and other prescribers may not recommend or prescribe momelotinib over other competing products.

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Many of the companies against which we may compete have significantly greater financial and other resources and expertise in research and development,
manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and marketing approved products than we do. Mergers and
acquisitions in the hematology and oncology industries may result in even more resources being concentrated among a smaller number of our competitors.
Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established
companies. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial
sites and patient registration for clinical trials, as well as in acquiring technologies complementary to, or that may be necessary for, our momelotinib
program. Development efforts and clinical results of other companies may be unsuccessful or terminated, which could result in a negative perception of
momelotinib, decreases in our stock price and adverse regulatory impacts, which could have a material and adverse effect on our ongoing development
programs and our business.

Our commercial opportunity could be reduced or eliminated if any competitors develop and commercialize products that are safer, more effective, have
fewer or less severe side effects, are more convenient or are less expensive than any drugs that we may develop. Our competitors also may obtain FDA or
foreign regulatory approval for their product candidates more rapidly than we may obtain approval for ours, which could result in our competitors
establishing a strong market position before we are able to enter the market. In addition, our ability to compete may be affected in many cases by insurers
or other third-party payors who may place restrictions on patient access to our drugs in seeking to encourage the use of generic or cheaper drugs. If we fail
to complete effectively, our business and operating results would be harmed.

We are dependent on our key personnel, and if we are not successful in attracting and retaining highly qualified personnel, we may not be able to
successfully implement our business strategy.

Our ability to compete in the highly competitive oncology industry depends upon our ability to attract and retain highly qualified managerial, scientific and
medical personnel. We have in the past and may in the future continue to experience changes in our executive management team resulting from the
departure of executives or subsequent hiring of new executives, which may be disruptive to our business. Any changes in business strategies can create
uncertainty, may negatively impact our ability to execute our business strategy and advance development, and may ultimately be unsuccessful. The impact
of hiring new executives may not be immediately realized. We are substantially dependent on the continued service of our existing management, scientific
and medical personnel, including Dr. Stephen Dilly, our President and Chief Executive Officer, Dr. Barbara Klencke, our Chief Development Officer, and
Dr. Mark Kowalski, our Chief Medical Officer, because of their familiarity with momelotinib and our development efforts. The loss of the services of any
of our executive officers, other key employees and other scientific and medical advisors, including due to illness resulting from COVID-19, and our
inability to find suitable replacements, could result in delays in product development and harm our business.

Our operations are conducted in regions where significant competition exists for key personnel and employees. Many other oncology companies and
academic and research institutions are located in these regions. Competition for skilled personnel in these markets is intense and may limit our ability to
hire and retain highly qualified personnel on acceptable terms or at all.

To induce valuable employees to remain at our company, in addition to salary and cash incentives, we have provided stock options that vest over time. The
value to employees of stock options that vest over time may be significantly affected by movements in our stock price that are beyond our control and may
at any time be insufficient to counteract more lucrative offers from other companies. Despite our efforts to retain valuable employees, members of our
management, scientific and development teams may terminate their employment with us on short notice. Although we have employment agreements with
our key employees, these employment agreements provide for at-will employment, which means that any of our employees could leave our employment at
any time, with or without notice. We do not maintain “key man” insurance policies on the lives of these individuals or the lives of any of our other
employees.

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Should momelotinib receive marketing approval in the United States, Canada, or elsewhere in the world, we would need to hire a substantial number of
specialized personnel, including field-based personnel, unless we were to collaborate with a third party to commercialize momelotinib. If we are
responsible for commercializing momelotinib, we would need to increase our administrative headcount to support such expanded development and
commercialization operations with respect to momelotinib. Our ability to attract and retain qualified personnel in the future is subject to intense
competition for qualified personnel among biotechnology, pharmaceutical and other businesses and our current financial position. The loss of the services
of any of our senior management could delay or prevent the development and commercialization of momelotinib or have other adverse effects on our
business for an indefinite term. In particular, if we lose any members of our current senior management team, we may not be able to find suitable
replacements in a timely fashion, if at all, and our business may be harmed as a result.

We may encounter difficulties in managing our expected growth and in expanding our operations successfully.

Prior to acquiring momelotinib, our most advanced product candidate was in Phase 1/2 development. Advancing momelotinib through Phase 3
development, will require us to develop or expand our development, regulatory, manufacturing, medical affairs, marketing and sales capabilities or contract
with third parties to provide these capabilities for us. We must also successfully integrate the employees and operations related to the development of
momelotinib. Maintaining additional relationships and managing our future growth will impose significant added responsibilities on members of our
management. We must be able to manage our development efforts effectively, manage our clinical trials effectively, hire, train and integrate additional
management, development, medical affairs, administrative and sales and marketing personnel, improve our managerial, development, operational and
finance systems, and expand our facilities, all of which may impose a strain on our administrative and operational infrastructure. Our future financial
performance will depend, in part, on our ability to manage this growth effectively. We may not be able to accomplish these tasks, failure of which could
prevent us from successfully developing and potentially commercializing momelotinib.

We may form or seek strategic alliances, licensing arrangements or other collaborations in the future. We may be unable to form or enter into such
alliances or arrangements, and we may not realize the expected benefits of any such transaction.

We may form or seek strategic alliances or licensing arrangements, or create joint ventures or collaborations with third parties that we believe will
complement or augment our development and commercialization efforts with respect to momelotinib and any future product candidates that we may
acquire or develop, or that may provide for other economic value. For example, in June 2020, we licensed SRA141 back to Carna Biosciences, the original
licensor. We may be entitled to certain profit share on royalty and non-royalty income and royalties on product sales. If Carna Biosciences or its
collaborators fail to successfully develop and commercialize SRA141, we will receive limited to no value from this transaction. This or any future strategic
transactions and relationships may require us to incur non-recurring and other charges, increase our near and long-term expenditures, issue securities that
dilute our existing stockholders, disrupt our management and business, forego potential future economic value or result in the loss of strategic value. These
transactions and relationships also may result in a delay in the development of momelotinib or any future product candidates if we become dependent upon
the other party and such other party does not prioritize the development of such product candidates relative to its other development activities.

In addition, we face significant competition in seeking appropriate strategic partners and the negotiation process is time-consuming and complex.
Moreover, we may not be successful in our efforts to establish a strategic partnership or other alternative arrangements for momelotinib because it may be
deemed to be at too early of a stage of development for collaborative effort or third parties may not view momelotinib as having the requisite potential to
demonstrate safety and efficacy. We cannot be certain that, following a strategic transaction or license, we will achieve the revenue or specific net income
that would justify such transaction.  

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Past and future acquisitions could disrupt our business and harm our financial condition and operating results.

We may acquire additional businesses or product candidates from third parties that we believe will complement or augment our existing momelotinib
program. For example, in August 2018, we entered into an Asset Purchase Agreement with Gilead whereby we acquired worldwide rights to the
pharmaceutical product momelotinib, an investigational orally-bioavailable JAK1, JAK2 and ACVR1 inhibitor together with all related intellectual
property rights and certain other related assets. Even if the assets we acquire have promising markets or technologies, we may not be able to realize the
benefit of acquiring such assets if we are unable to successfully integrate them with our existing operations and company culture. We may encounter
numerous difficulties in developing, manufacturing and marketing any new product candidates resulting from an acquisition, including momelotinib, which
may delay or prevent us from realizing their expected benefits or enhancing our business. We cannot assure you that, following any such acquisition, we
will achieve the expected synergies or benefits from the asset to justify the transaction. The risks we face in connection with acquisitions, including our
acquisition of momelotinib, include, but are not limited to:

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diversion of management time and focus from operating our business to addressing acquisition integration challenges;

integration of research and development efforts;

hiring or training of key employees with knowledge regarding the acquired asset;

changes in relationships with strategic partners as a result of product acquisitions or strategic positioning resulting from the acquisition;

cultural challenges associated with integrating employees, knowledge and processes related to the acquired asset into our organization;  

unanticipated write-offs or charges; and

litigation or other claims in connection with the acquired asset.

Our failure to address these risks or other problems encountered in connection with acquisitions could cause us to fail to realize the anticipated benefits of
these transactions, cause us to incur unanticipated liabilities and harm the business generally. There is also a risk that future acquisitions will result in the
incurrence of debt, contingent liabilities, amortization expenses or incremental operating expenses, any of which could harm our financial condition or
operating results.

If we are unable to adequately prepare the market for the potential future commercialization of a product, we may not be able to generate product
revenue once marketing authorization is obtained. We currently have no marketing and sales organization and have no experience in marketing
products. If we are unable to establish marketing and sales capabilities or enter into agreements with third parties to market and sell momelotinib or
any future product candidates, we may not be able to generate product revenue.

We have not yet begun to prepare for potential future commercialization, and currently have limited commercialization expertise, including no sales,
marketing or distribution capabilities and no experience in marketing products. Advancing momelotinib through Phase 3 development and closer to
potential approval will require us to begin commercialization preparation activities and incur related expenses before we obtain final trial results and know
whether MOMENTUM will support regulatory approval. These activities will include, among other things, the development of an in-house marketing
organization and sales force, which will require significant capital expenditures, management resources and time. We will have to compete with other
companies to recruit, hire, train and retain qualified marketing and sales personnel. If we are unable to adequately prepare the market for the potential
future commercialization of a product, we may not be able to generate product revenue once marketing authorization is obtained.

Additionally, if we are unable or decide not to establish internal sales, marketing and distribution capabilities, we will pursue collaborative arrangements
regarding the sales and marketing of our products, however, there can be no assurance that we will be able to establish or maintain such collaborative
arrangements on commercially reasonable terms, or if we are able to do so, that they will have effective sales forces. Any revenue we receive will depend
upon the efforts of such third parties, which may not be successful. We may have little or no control over the marketing and sales efforts of such third
parties and our revenue from product sales may be lower than if we had commercialized momelotinib or any future product candidates ourselves. We also
face competition in our search for third parties to assist us with the sales and marketing efforts of momelotinib.

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We cannot guarantee that we will be able to develop in-house commercialization expertise, including sales and distribution capabilities, or establish or
maintain relationships with third-party collaborators to commercialize any product in the United States or overseas.

We depend on our information technology and infrastructure.

We rely on the efficient and uninterrupted operation of information technology systems, including mobile technologies, to manage our operations, to
process, transmit and store electronic and financial information, and to comply with regulatory, legal and tax requirements. We also depend on our
information technology infrastructure for communications among our personnel, contractors, consultants and vendors. System failures or outages,
including any potential disruptions due to significantly increased global demand on certain cloud based systems during the COVID-19 situation, could
compromise our ability to perform these functions in a timely manner, which could harm our ability to conduct business or delay our financial reporting.
Such failures could materially adversely affect our operating results and financial condition.

In addition, we depend on third parties to operate and support our information technology systems. These third parties vary from multi-disciplined to
boutique providers, and they may have access to our computer networks, mobile networks, and our confidential information. Many of these third parties
subcontract or outsource some of their responsibilities to other third parties. As a result, our information technology systems, including those functions that
are performed by third parties who are involved with or have access to our systems, are very large and complex. Failure by any of these third-party
providers to adequately deliver the contracted services, or maintain confidentiality and adequate security controls, could have an adverse effect on our
business, which in turn may materially adversely affect our operating results and financial condition. Although we take measures designed to prevent
security breaches and cyberattacks, these efforts may not completely eliminate the risk of such incidents and we cannot guarantee security incidents will
not impact us in the future. We may need to continuously increase cost and resources to protect security threats and their consequences. If our information
technology systems were to fail or be breached, such failure or breach could materially adversely affect our ability to perform critical business functions
and sensitive and confidential data could be compromised.

Our internal information technology systems, or those used by our CROs or other contractors or consultants, may fail or suffer security breaches.

Despite our efforts to implement effective administrative, technical, and physical security measures and controls, our internal information technology
systems and those of our CROs and other contractors and consultants may become vulnerable to damage from security breaches and/or unauthorized
access. The prevalent use of mobile devices also increases the risk of data security incidents resulting from lost or stolen devices or compromised security
controls. In the ordinary course of our business, we collect, store, process and transmit large amounts of sensitive information, including intellectual
property, proprietary business information, personal information, health information, financial information, and other confidential information. It is critical
that we do so in a secure manner in order to ensure the confidentiality, integrity, and availability of such sensitive information. We have in the past
experienced, and may in the future experience, a security breach. When we have experienced security breaches in the past, we took immediate action to
prevent any additional unauthorized access, put further security controls in place and worked with outside counsel for any necessary reporting
requirements. Any material system failure or security breach could cause interruptions in our operations and could result in a material disruption of our
development programs and our business operations. For example, the loss of data from completed or future preclinical studies or clinical trials could result
in significant delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. Likewise, we rely on other third
parties for the manufacture of momelotinib and to conduct studies and trials, and similar events relating to their information technology systems could also
have a material adverse effect on our business. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or
applications, or inappropriate disclosure of confidential or proprietary information, including personal and sensitive information, we could incur liability
and the further development and commercialization of momelotinib could be significantly delayed.

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Unstable or unfavorable global market and economic conditions may have adverse consequences on our business, financial condition and stock price.

Our results of operations could be adversely affected by general conditions in the global economy and in the global financial markets. Global credit and
financial markets have experienced extreme volatility and disruptions in the past several years, including severely diminished liquidity and credit
availability, declines in consumer confidence, declines in economic growth, increases in unemployment rates and uncertainty about economic stability. We
cannot assure you that further deterioration in credit and financial markets and confidence in economic conditions will not occur. Our general business
strategy and stock price may be adversely affected by any such economic downturn, volatile business environment or large-scale unpredictable or unstable
market conditions, including a prolonged government shutdown or as a result of a global pandemic such as the COVID-19 pandemic. While the potential
economic impact brought by and the duration of the pandemic may be difficult to assess or predict, it has already caused, and is likely to result in further,
significant disruption of global financial markets, which may reduce our ability to access capital either at all or on favorable terms. In addition, a recession,
depression or other sustained adverse market event resulting from the spread of COVID-19 could materially and adversely affect our business and the value
of our common stock.

If the current equity and credit markets deteriorate, it may make any necessary debt or equity financing more difficult, more costly and more dilutive.
Failure to secure any necessary financing in a timely manner and on favorable terms could have a material adverse effect on our growth strategy, financial
performance and stock price and could require us to delay or abandon development plans. In addition, there is a risk that one or more of our current service
providers, manufacturers and other partners may not survive difficult economic times, which could directly affect our ability to attain our operating goals
on schedule and on budget.

Our employees, independent contractors, consultants, commercial partners and vendors may engage in misconduct or other improper activities,
including noncompliance with regulatory standards and requirements.

We are exposed to the risk of fraud or other illegal activity by our employees, independent contractors, consultants, commercial partners and vendors.
Misconduct by such individuals could include intentional failures to comply with FDA or international regulations, provide accurate information to the
FDA or foreign regulatory authorities, comply with manufacturing standards, comply with federal and state healthcare fraud and abuse laws and
regulations, report financial information or data timely, completely and accurately or disclose unauthorized activities to us. In particular, sales, marketing
and business arrangements in the healthcare industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing and
other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales
commission, customer incentive programs and other business arrangements. Misconduct by third parties could also involve the improper use of information
obtained in the course of clinical trials.

We have adopted a code of business conduct and ethics, but it is not always possible to identify and deter employee misconduct, and the precautions we
take to detect and prevent inappropriate conduct may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from
governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. Efforts to ensure that
our business arrangements will comply with applicable healthcare laws may involve substantial costs. It is possible that governmental and enforcement
authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law interpreting applicable fraud
and abuse or other healthcare laws and regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or
asserting our rights, those actions could have a significant impact on our business, including the imposition of civil, criminal and administrative penalties,
damages, disgorgement, monetary fines, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs, contractual
damages, reputational harm, diminished profits and future earnings and curtailment of our operations, any of which could adversely affect our ability to
operate our business and our results of operations. In addition, the approval and commercialization of momelotinib outside the United States will also likely
subject us to foreign equivalents of the healthcare laws mentioned above, among other foreign laws.

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Even if approved, our product candidates may not achieve adequate market acceptance among physicians, patients, healthcare payors and others in the
medical community necessary for commercial success.

Even if our product candidates receive regulatory approval, they may not gain adequate market acceptance among physicians, patients, healthcare payors
and others in the medical community. The degree of market acceptance of any of our approved product candidates will depend on a number of factors,
including:

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the efficacy and safety profile as demonstrated in clinical trials compared to alternative treatments;

the timing of market introduction of the product candidate as well as competitive products;

the clinical indications for which the product candidate is approved;

restrictions on the use of our product candidates, such as boxed warnings or contraindications in labeling, or a REMS, if any, which may
not be required of alternative treatments and competitor products;

the potential and perceived advantages of product candidates over alternative treatments;

the cost of treatment in relation to alternative treatments;

pricing and the availability of coverage and adequate reimbursement by third-party payors, including government authorities;

relative convenience and ease of administration;

the willingness of the target patient population to try new therapies and of physicians to prescribe these therapies;

the effectiveness of sales and marketing efforts;

unfavorable publicity relating to our products or product candidates or similar approved products or product candidates in development by
third parties; and

the approval of other new therapies for the same indications.

If any of our product candidates is approved but does not achieve an adequate level of acceptance by physicians, hospitals, healthcare payors and patients,
we may not generate or derive sufficient revenue from that product candidate and our financial results could be negatively impacted.

We have never commercialized a product candidate before and may lack the necessary expertise, personnel and resources to successfully commercialize
any products on our own or together with suitable collaborators.

We have never commercialized a product candidate. We may license certain rights with respect to our product candidates to collaborators, and, if so, we
will rely on the assistance and guidance of those collaborators. For product candidates for which we retain commercialization rights and marketing
approval, we will have to develop our own sales, marketing and supply organization or outsource these activities to a third party.

Factors that may affect our ability to commercialize our product candidates, if approved, on our own include recruiting and retaining adequate numbers of
effective sales and marketing personnel, developing adequate educational and marketing programs to increase public acceptance of our approved product
candidates, ensuring regulatory compliance of our company, employees and third parties under applicable healthcare laws, and other unforeseen costs
associated with creating an independent sales and marketing organization. Developing a sales and marketing organization will be expensive and time-
consuming and could delay the launch of our product candidates upon approval. We may not be able to build an effective sales and marketing organization.
If we are unable to build our own distribution and marketing capabilities or to find suitable partners for the commercialization of our product candidates,
we may not generate revenues from them or be able to reach or sustain profitability.

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If the market opportunity for any product candidate that we develop is smaller than we believe, our revenue may be adversely affected, and our business
may suffer.

We intend to initially focus our product candidate development on treatments for various oncology indications, including myelofibrosis. The addressable
patient populations that may benefit from treatment with our product candidates, if approved, are based on our estimates. These estimates, which have been
derived from a variety of sources, including scientific literature, surveys of clinics, patient foundations and market research, may prove to be incorrect.
Further, new studies may change the estimated incidence or prevalence of these diseases. Any regulatory approval of our product candidates would be
limited to the therapeutic indications examined in our clinical trials and as determined by the FDA, which would not permit us to market our products for
any other therapeutic indications not expressly approved by the FDA. Additionally, the potentially addressable patient population for our product
candidates may not ultimately be amenable to treatment with our product candidates. Even if we receive regulatory approval for any of our product
candidates, such approval could be conditioned upon label restrictions that materially limit the addressable patient population. Our market opportunity may
also be limited by future competitor treatments that enter the market. If any of our estimates prove to be inaccurate, the market opportunity for any product
candidate that we or our strategic partners develop could be significantly diminished and have an adverse material impact on our business.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of momelotinib.

We face an inherent risk of product liability as a result of the testing of momelotinib and will face an even greater risk if we commercialize any products.
For example, we may be sued if momelotinib causes or is perceived to cause injury or is found to be otherwise unsuitable during testing, manufacturing,
marketing or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, a failure to warn of dangers
inherent in the product, negligence, strict liability or a breach of warranties. Claims could also be asserted under state consumer protection acts. If we
cannot successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit commercialization of
momelotinib. Even successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome,
liability claims may result in, but are not limited to:

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decreased demand for momelotinib;

injury to our reputation;

withdrawal of clinical trial participants;

initiation of investigations by regulators;

costs to defend the related litigation;

a diversion of management’s time and our resources;

substantial monetary awards to trial participants or patients;

product recalls, withdrawals or labeling, marketing or promotional restrictions;

loss of revenue;

exhaustion of any available insurance and our capital resources;

the inability to commercialize momelotinib; and

a decline in our stock price.

We currently hold liability insurance coverage, but that coverage may not be adequate to cover any and all liabilities that we may incur. We would need to
increase our insurance coverage when we begin the commercialization of momelotinib, if ever. Insurance coverage is increasingly expensive. We may not
be able to maintain insurance coverage at a reasonable cost or in an amount adequate to satisfy any liability that may arise.

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A variety of risks associated with marketing our product candidates internationally may materially adversely affect our business.

We plan to eventually seek regulatory approval of our product candidates outside of the United States and, accordingly, we expect that we will be subject to
additional risks related to operating in foreign countries if we obtain the necessary approvals, including:

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differing regulatory requirements in foreign countries, such as the lack of pathways for accelerated drug approval, may result in foreign
regulatory approvals taking longer and being more costly than obtaining approval in the United States;

foreign regulatory authorities may disagree with the design, implementation or results of our clinical trials or our interpretation of data from
nonclinical studies or clinical trials;

approval policies or regulations of foreign regulatory authorities may significantly change in a manner rendering our clinical data
insufficient for approval;

impact of the COVID-19 pandemic on our ability to produce our product candidates and conduct clinical trials in foreign countries;

unexpected changes in tariffs, trade barriers, price and exchange controls and other regulatory requirements;

economic weakness, including inflation, or political instability in particular foreign economies and markets;

compliance with legal requirements applicable to privacy, data protection, information security and other matters;

compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;

foreign taxes, including withholding of payroll taxes;

foreign currency fluctuations, which could result in increased operating expenses and reduced revenue, and other obligations incident to
doing business in another country;

difficulties staffing and managing foreign operations;

complexities associated with managing multiple payor reimbursement regimes and government payors in foreign countries;

workforce uncertainty in countries where labor unrest is more common than in the United States;  

potential liability under the Foreign Corrupt Practices Act of 1977 or comparable foreign regulations;

challenges enforcing our contractual and intellectual property rights, especially in those foreign countries that do not respect and protect
intellectual property rights to the same extent as the United States;

production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad; and

business interruptions resulting from geo-political actions, including war and terrorism.

These and other risks associated with international operations may materially adversely affect our ability to attain or maintain profitable operations.

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Our ability to utilize our net operating loss carryforwards and certain other tax attributes may be significantly limited, or entirely restricted.

As of December 31, 2020, we had gross U.S. federal net tax operating loss carryforwards of 54.8 million that are eligible for an indefinite carryforward,
and gross state operating loss carryforwards of $52.4 million expiring in years ranging from 2022 to 2040. As of December 31, 2020, we also had U.S. net
tax credit carryforwards of $4.6 million which begin to expire in 2039 and net tax credit carryforwards in a foreign jurisdiction of $0.5 million which begin
to expire in 2038.

Under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, if a corporation undergoes an “ownership change,” the corporation’s
ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes, such as research tax credits, to offset its post-change
income and taxes may be limited. In general, an “ownership change” generally occurs if there is a cumulative change in our ownership by “5%
stockholders” that exceeds 50 percentage points over a rolling three-year period. Similar rules may apply under state tax laws.

We have experienced ownership changes in the past, including in 2017 and 2019, and may experience ownership changes in the future as a result of future
transactions in our stock, some of which may be outside our control. As a result, if we earn net taxable income, our ability to use our pre-change net
operating loss carryforwards, or other pre-change tax attributes, to offset U.S. federal and state taxable income and taxes may be subject to limitations. We
may have exposure to greater than anticipated tax liabilities, which could adversely impact our operating results.

We are a U.S.-based multinational company subject to tax in certain U.S. and foreign tax jurisdictions. U.S. federal, state and local, as well as international
tax laws and regulations are extremely complex and subject to varying interpretations. Although we believe that our tax estimates and tax positions are
reasonable, there can be no assurance that our tax positions will not be challenged by relevant tax authorities or that we would be successful in any such
challenge. If we are unsuccessful in such a challenge, the relevant tax authorities may assess additional taxes, which could result in adjustments to, or
impact the timing or amount of, taxable income, deductions or other tax allocations, which may adversely affect our results of operations and financial
position.

Our quarterly operating results may fluctuate significantly, which may cause our stock price to fluctuate or decline.

We expect our operating results to be subject to quarterly fluctuations. Our net loss and other operating results will be affected by numerous factors,
including, but not limited to:

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variations in the level of expense related to momelotinib or future development programs;

results of preclinical studies and clinical trials, or the addition or termination of preclinical studies, clinical trials or funding support;

the timing of the release of results from any preclinical studies and clinical trials;

the timing and amount of milestone and royalty payments;

changes in the competitive landscape or market opportunity for momelotinib;

our execution of any new collaboration, licensing or similar arrangement, and the timing of payments we may make or receive under such
existing or future arrangements or the termination or modification of any such existing or future arrangements;

any intellectual property infringement lawsuit or opposition, interference or cancellation proceeding in which we may become involved;

any securities or other litigation in which we may become involved;

additions and departures of key personnel;

strategic decisions by us or our competitors, such as acquisitions, divestitures, spin-offs, joint ventures,

strategic investments or changes in business strategy;

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the receipt of regulatory approval for momelotinib, and market acceptance and demand for momelotinib;  

regulatory developments affecting momelotinib or those of our competitors; and  

changes in general market and economic conditions, including global pandemics such as COVID-19.

If our quarterly operating results or expected results from development of momelotinib fall outside the expectations of investors or securities analysts, the
price of our common stock could decline substantially. Furthermore, any quarterly fluctuations in our operating results may, in turn, cause the price of our
stock to fluctuate substantially. We believe that quarterly comparisons of our financial results are not necessarily meaningful and should not be relied upon
as an indication of our future performance.

Risks Related to Government Regulation

We may be unable to obtain U.S. or foreign regulatory approval of momelotinib, and, as a result, we may be unable to commercialize momelotinib.
Obtaining and maintaining regulatory approval of our product candidates in one jurisdiction does not mean that we will be successful in obtaining
regulatory approval of our product candidates in other jurisdictions.

Momelotinib is, and any future product candidates that we may develop will be, subject to extensive governmental regulations relating to, among other
things, research, testing, development, manufacturing, safety, efficacy, approval, recordkeeping, import, export, reporting, labeling, storage, packaging,
advertising and promotion, pricing, marketing, distribution, import and export of drugs. Rigorous preclinical testing and clinical trials and an extensive
regulatory approval process are required to be successfully completed before a new drug can be marketed in the United States and in many foreign
jurisdictions. Satisfaction of these and other regulatory requirements is costly, time-consuming, uncertain and subject to unanticipated delays. It is possible
that none of the product candidates we may develop will obtain the regulatory approvals necessary for us or our collaborators to begin selling them.

As a company, we have very limited experience in conducting and managing the clinical trials necessary to obtain regulatory approvals, including approval
by the FDA or foreign regulatory authorities, and, as a company, we have no experience in obtaining approval of any product candidates. The time required
to obtain FDA and other approvals is unpredictable but typically takes many years following the initiation of clinical trials, depending upon the type,
complexity and novelty of the product candidate. We may encounter delays or rejections during any stage of the regulatory review and approval process
based upon the failure of clinical or laboratory data to demonstrate compliance with, or upon the failure of the product candidates to meet, the FDA’s or
foreign regulatory authorities’ requirements for safety, efficacy and quality.

The standards that the FDA and foreign regulatory authorities use when regulating us are not always applied predictably or uniformly and can change.
Because the product candidates we are developing or may develop may represent a new class of drug, the FDA and foreign regulatory authorities have not
yet established any definitive policies, practices or guidelines in relation to these drugs. The lack of policies, practices or guidelines may hinder or slow
review by the FDA or foreign regulatory authorities of any regulatory filings that we may submit. Moreover, the FDA or foreign regulatory authorities may
respond to these submissions by defining requirements we may not have anticipated. Such responses could lead to significant delays in the development of
momelotinib or any future product candidates.

Any analysis we perform of data from preclinical and clinical activities is subject to confirmation and interpretation by regulatory authorities, which could
delay, limit or prevent regulatory approval. We may also encounter unexpected delays or increased costs due to new government regulations, for example,
from future legislation or administrative action, or from changes in FDA or foreign regulatory authority policy during the period of product development,
clinical trials and regulatory review. It is impossible to predict whether legislative changes will be enacted, or whether FDA or foreign regulatory authority,
guidance or interpretations will be changed, or what the impact of such changes, if any, may be.

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In addition, the FDA and/or foreign regulatory authorities may delay, limit, or deny approval of a product candidate for many reasons, including, but not
limited to:

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the FDA or foreign regulatory authorities may disagree with the design or implementation of our clinical trials, including our statistical plan;

we may be unable to demonstrate to the satisfaction of the FDA or foreign regulatory authorities that a product candidate is safe and effective
for any indication;

we may be unable to demonstrate that a product candidate’s clinical and other benefits outweigh its safety risks;

the FDA or foreign regulatory authorities may disagree with our interpretation of data from preclinical studies or clinical trials;

the results of our clinical trials may not demonstrate the safety or efficacy required by the FDA or foreign regulatory authorities for approval;

we may be unable to demonstrate the integrity of the clinical trial data to the satisfaction of the FDA or foreign regulatory authorities;

we may be unable to demonstrate the proper conduct of the clinical trial at all clinical trial sites, by our vendors, and by the Sponsor to the
satisfaction of the FDA or foreign regulatory authorities;

we may encounter difficulties coming to agreement with the FDA or foreign regulatory authorities on a pediatric investigation or study plan or
may encounter difficulties meeting the terms of the plan, once agreed;

the FDA or foreign regulatory authorities may find deficiencies in our manufacturing processes or facilities;

the FDA or foreign regulatory authorities may lack resources or are delayed in conduct pre-approval inspections due to reasons related to
COVID-19; and

the FDA’s or foreign regulatory authorities’ approval policies or regulations may significantly change in a manner rendering our clinical data
insufficient for approval.

Even if we comply with all of the regulatory requirements of the FDA and foreign regulatory authorities, we may not obtain regulatory approval for
momelotinib. If we fail to obtain regulatory approval for momelotinib, we will have no commercialized products and correspondingly no revenue.

In addition, because there may be approved treatments for some of the diseases for which we may seek approval, in order to receive regulatory approval,
we may need to demonstrate through clinical trials that the product candidates we develop to treat these diseases, if any, are not only safe and effective, but
safer or more effective than existing products. Furthermore, in recent years, there has been increased public and political pressure on the FDA with respect
to the approval process for new drugs, and the FDA’s standards, especially regarding drug safety, appear to have become more stringent.

Any delay or failure in obtaining required approvals could have a material adverse effect on our ability to generate revenues from the particular product
candidate for which we are seeking approval. Furthermore, any regulatory approval to market a product may be subject to limitations on the approved uses
for which we may market the product or the labeling or other restrictions. In addition, the FDA has the authority to require a REMS plan as part of or after
approval, which may impose further requirements or restrictions on the distribution or use of an approved product, such as limiting prescribing to certain
physicians or medical centers that have undergone specialized training, limiting treatment to patients who meet certain safe-use criteria and requiring
treated patients to enroll in a registry. These limitations and restrictions may limit the size of the market for the product and affect reimbursement by third-
party payors.

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If we or any collaborators, manufacturers or service providers fail to comply with applicable federal, state or foreign laws or regulations, we could be
subject to enforcement actions, which could affect our ability to develop, market and sell our products successfully and could harm our reputation and lead
to reduced acceptance of our products by the market. These enforcement actions include, among others:

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adverse regulatory inspection findings;

warning letters;

voluntary or mandatory product recalls or public notification or medical product safety alerts to healthcare professionals;

restrictions on, or prohibitions against, marketing our products;

restrictions on, or prohibitions against, importation or exportation of our products;

suspension of review or refusal to approve pending applications or supplements to approved applications;

exclusion from participation in government-funded healthcare programs;

exclusion from eligibility for the award of government contracts for our products;

suspension or withdrawal of product approvals;

product seizures;

injunctions; and

civil and criminal penalties and fines.

We are also subject to numerous foreign regulatory requirements governing, among other things, the conduct of clinical trials, manufacturing and
marketing authorization, pricing and third-party reimbursement. The foreign regulatory approval process varies among countries and may include all of the
risks associated with FDA approval described above as well as risks attributable to the satisfaction of local regulations in foreign jurisdictions. Moreover,
the time required to obtain approval may differ from that required to obtain FDA approval. Approval by the FDA does not ensure approval by regulatory
authorities outside the United States and vice versa.

In Europe, the implementation of the Clinical Trials Regulation depends on confirmation of full functionality of the Clinical Trials Information System
(CTIS) through an independent audit, which commenced in September 2020. The system is currently planned to go live in December 2021. The new
clinical trial portal and database will be maintained by the EMA in collaboration with the European Commission and the European Union Member States.
The objectives of the new regulation include consistent rules for conducting trials throughout the European Union, consistent data standards and adverse
events listing, and consistent information on the authorization status. Information on the conduct and results of each clinical trial carried out in the
European Union will be made publicly available.

In addition, a new pan-European clinical trial data information database has been created that will be complementary to the database established for
pharmacovigilance (Regulation (EC) No 726/2004 with respect to centrally authorized medicinal products). In addition, Commission Implementing
Regulation (EU) No 520/2012 outlines the practical implications for marketing authorization holders, national competent authorities, and the EMA. Also,
Commission Delegated Regulation (EU) No 357/2014 on post-authorization efficacy studies specifies the situations in which such studies may be required.
Post-authorization efficacy studies may be required where concerns relating to some aspects of efficacy of the medicinal product are identified and can be
resolved only after the medicinal product has been marketed, or where the understanding of the disease, the clinical methodology or the use of the
medicinal product under real-life conditions indicate that previous efficacy evaluations might have to be revised significantly.

Brexit is also expected to disrupt the operation of pre- and post-authorization clinical trial infrastructure. The rules around GMP and pharmacovigilance in
the UK currently remain similar to the EU requirements. However, the Falsified Medicines Directive will not apply in Great Britain though it is likely that
the UK will implement a procedure to minimise the risk of falsified medicines.

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Uncertainty in the regulatory framework and future legislation can lead to disruption in the execution of international multi-center clinical trials, the
monitoring of adverse events in through pharmacovigilance programs, the evaluation of the benefit-risk profiles of new medicinal products, and
determination of marketing authorization across different jurisdictions. There could also be disruption to the supply and distribution as well as the
import/export both of active pharmaceutical ingredients (API) and finished product. Such a disruption could create supply difficulties for ongoing clinical
trials and may damage the integrity of the pharmacovigilance database for the safety of new products.

The cumulative effects of the disruption to the regulatory framework, uncertainty in future regulation, and changes to existing regulations may add
considerably to the development lead time to marketing authorization and commercialization of products in the European Union and/or the United
Kingdom and increase our costs. We cannot predict the impact of such changes and future regulation on our business or the results of our operations.

Even if we receive regulatory approval of any product candidates, we will be subject to ongoing regulatory obligations and continued regulatory review,
which may result in significant additional expense and we may be subject to penalties if we fail to comply with regulatory requirements or experience
unanticipated problems with our product candidates.

Any regulatory approvals that we receive for any product candidates we may develop will require surveillance to monitor the safety and efficacy of the
product candidate, and may require us to conduct post-approval clinical studies. The FDA may also require a REMS in order to approve momelotinib or
any future product candidates, which could entail requirements for a medication guide, physician communication plans or additional elements to ensure
safe use, such as restricted distribution methods, patient registries and other risk minimization tools. In addition, if the FDA or a foreign regulatory
authority approves momelotinib, the manufacturing processes, labeling, packaging, distribution, AE reporting, storage, advertising, promotion, import,
export and recordkeeping for momelotinib will be subject to extensive and ongoing regulatory requirements. These requirements include submissions of
safety and other post-marketing information and reports, registration, as well as continued compliance with cGMPs and GCPs for any clinical trials that we
conduct post-approval.

Moreover, if we obtain regulatory approval for momelotinib, we will only be permitted to market our products for the indication approved by FDA or
foreign regulatory authority, and such approval may involve limitations on the indicated uses or promotional claims we may make for our products, or
otherwise not permit labeling that sufficiently differentiates momelotinib from competitive products with comparable therapeutic profiles. For example, we
will not be able to claim that our products have fewer side effects, or improve compliance or efficacy unless we can demonstrate those attributes to FDA or
foreign regulatory authority in comparative clinical trials. Communications that occur prior to obtaining regulatory approval for momelotinib could also be
considered promotional and thus may also be subject to certain FDA or foreign regulatory authority requirements.

Later discovery of previously unknown problems with momelotinib, including adverse effects of unanticipated severity or frequency, or with our third-
party manufacturers or manufacturing processes, or failure to comply with regulatory requirements, may result in, among other things:

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restrictions on the marketing or manufacturing of momelotinib, withdrawal of the product from the market, or voluntary or mandatory product
recalls;

manufacturing delays and supply disruptions where regulatory inspections identify observations of noncompliance requiring remediation;

revisions to the labeling, including limitation on approved uses or the addition of additional warnings, contraindications or other safety
information, including boxed warnings;

imposition of a REMS, which may include distribution or use restrictions;

requirements to conduct additional post-market clinical trials to assess the safety of the product;

fines, warning letters, or untitled letters;

holds on clinical trials;

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refusal by the FDA or foreign regulatory authorities to approve pending applications or supplements to approved applications filed by us or
suspension or revocation of license approvals;

product seizure or detention, or refusal to permit the import or export of momelotinib; and

injunctions, the imposition of civil penalties or criminal prosecution.

The FDA’s and foreign regulatory authorities’ policies may change, and additional government regulations may be enacted that could prevent, limit or
delay regulatory approval of our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future
legislation or administrative action, either in the United States or abroad. If we are slow or unable to adapt to changes in existing requirements or the
adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have
obtained, and we may not achieve or sustain profitability.

Moreover, the FDA strictly regulates the promotional claims that may be made about drug products. In particular, a product may not be promoted for uses
that are not approved by the FDA as reflected in the product’s approved labeling. The FDA and other agencies actively enforce the laws and regulations
prohibiting the promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant civil,
criminal and administrative penalties. The occurrence of any event or penalty described above may inhibit our ability to commercialize our product
candidates and generate revenue and could require us to expend significant time and resources in response and could generate negative publicity.

A Fast Track designation by the FDA, even if granted for momelotinib or any future product candidates, may not lead to a faster development or
regulatory review or approval process, and does not increase the likelihood that such product candidates will receive marketing approval.

If a drug is intended for the treatment of a serious or life-threatening condition and the drug demonstrates the potential to address unmet medical needs for
this condition, the drug sponsor may apply for FDA Fast Track designation for a particular indication. Marketing applications filed by sponsors of products
in Fast Track development may qualify for priority review under the policies and procedures offered by the FDA, but the Fast Track designation does not
assure any such qualification or ultimate marketing approval by the FDA. We previously announced that the FDA had granted Fast Track designation to
momelotinib for the treatment of patients with intermediate/high-risk myelofibrosis who have previously received a JAK inhibitor. Receipt of Fast Track
designation may not result in a faster development process, review or approval compared to drugs considered for approval under conventional FDA
procedures. In addition, the FDA may withdraw any Fast Track designation at any time if it believes that the designation is no longer supported by data
from our clinical development program. We may seek Fast Track designation for any future product candidates, but there is no assurance that the FDA will
grant this status to any future proposed product candidates.

If we or any of our independent contractors, consultants, collaborators, manufacturers, vendors or service providers fail to comply with healthcare and
data privacy laws and regulations, we or they could be subject to enforcement actions, which could result in penalties and affect our ability to develop,
market and sell momelotinib or any future product candidates and may harm our reputation.

We are or may in the future be subject to federal, state, and foreign healthcare and data privacy laws and regulations pertaining to, among other things,
fraud and abuse, data protection and patients’ rights. These laws and regulations include, but are not limited to:

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the U.S. federal Anti-Kickback Statute, which prohibits, among other things, persons and entities from soliciting, receiving or providing
remuneration, directly or indirectly, to induce either the referral of an individual for a healthcare item or service, or the purchasing or ordering
of an item or service, for which payment may be made under a federal healthcare program such as Medicare or Medicaid;

the U.S. federal false claims and civil monetary penalties laws, including the federal civil False Claims Act, which prohibit, among other
things, individuals or entities from knowingly presenting or causing to be presented, claims for payment by government funded programs such
as Medicare or Medicaid that are false or fraudulent, and which may apply to us by virtue of statements and representations made to customers
or third parties;

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the U.S. federal Health Insurance Portability and Accountability Act (HIPAA), which created additional federal criminal statutes that prohibit,
among other things, knowingly and willfully executing or attempting to execute a scheme to defraud healthcare programs;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act (HITECH), which imposes requirements on
certain types of people and entities relating to the privacy, security, and transmission of individually identifiable protected health information
(PHI), and requires notification to affected individuals and regulatory authorities of certain breaches of security of PHI;

the federal Physician Payment Sunshine Act, which requires certain manufacturers of drugs, devices, biologics and medical supplies for which
payment is available under Medicare, Medicaid, or the Children’s Health Insurance Program, to report annually to the Centers for Medicare &
Medicaid Services information related to payments and other transfers of value to physicians, other healthcare providers and teaching hospitals,
and ownership and investment interests held by physicians and other healthcare providers and their immediate family members, which is
published in a searchable form on an annual basis; effective January 1, 2022, we will also be required to report on transfers of value to
physician assistants, nurse practitioners or clinical nurse specialists, certified registered nurse anesthetists, and anesthesiologist assistants, and
certified nurse-midwives; and

state laws comparable to each of the above federal laws, such as, for example, anti-kickback and false claims laws that may be broader in scope
and also apply to commercial insurers and other non-federal payors, requirements for mandatory corporate regulatory compliance programs,
and laws relating to patient data privacy and security. Other state laws require pharmaceutical companies to comply with the pharmaceutical
industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government; require drug
manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing
expenditures; and state and foreign laws govern the privacy and security of health information in some circumstances, many of which differ
from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.

In the European Union (EU), the General Data Protection Regulation (GDPR) was adopted in 2016 and took effect on May 25, 2018. The GDPR is
intended to harmonize data protection requirements across the EU Member States by establishing new and expanded operational requirements for entities
that process, or control personal data generated in the EU, including consent requirements for disclosing the way personal information will be used,
information retention requirements, notification requirements in the event of a data breach, and other requirements. In addition, the GDPR imposes strict
rules on the transfer of personal data out of the EU to the United States. These obligations may be interpreted and applied in a manner that is inconsistent
from one jurisdiction to another and may conflict with other requirements or our practices. Recent developments have also created uncertainty regarding
the rules around such data transfers.

A breach of the GDPR could result in regulatory investigations, reputational damage, orders to cease or change our processing of our data, enforcement
notices, or assessment notices (for a compulsory audit). We may also face civil claims including representative actions and other class action type litigation
(where individuals have suffered harm), potentially amounting to significant compensation or damages liabilities, as well as associated costs, diversion of
internal resources, and reputational harm. Beginning in 2021, the UK will be a “third country” under the GDPR. We may, however, incur liabilities,
expenses, costs, and other operational losses under GDPR and applicable EU Member States and the United Kingdom privacy laws in connection with any
measures we take to comply with them. In particular, from January 2021, after the end of the Brexit transitional period, we could potentially be exposed to
two parallel regimes, each with the power to impose fines up to the greater of either 4% of total global annual revenue, or €20 million (for the EU) or £17.5
million (for the United Kingdom).

On July 16, 2020, the Court of Justice of the EU (ECJ) invalidated the EU-U.S. Privacy Shield as a mechanism for managing personal data transfers
between the EU and the U.S. and onward to other countries. While the ECJ upheld the adequacy of EU-specified standard contractual clauses (SCCs), a
form of contract approved by the EU commission as an adequate data transfer mechanism, it made clear that reliance on them alone may not necessarily be
sufficient in all circumstances and that their use must be assessed on a case-by-case basis taking into account the surveillance laws and right of individuals
in the U.S and other onward countries. The ECJ went on to state that, if the competent supervisory authority in an EU country believes that the SCCs
cannot be complied with in the recipient country and the required level of protection cannot be secured by other means, such supervisory authority is under
an obligation to suspend or prohibit that transfer unless the data exporter has already done so itself. For example, German and Irish supervisory authorities
have indicated that the SCCs alone provide inadequate protection for EU-U.S. data transfers.

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We are currently certified under the EU-U.S. Privacy Shield and the Swiss-U.S. Privacy Shield with respect to our transfer of certain personal data from the
EU to the U.S. however, we have evaluated and are in the process of updating the mechanisms we currently use to transfer personal data from the EU and
the United Kingdom to the U.S., and any additional mechanisms that may be required to maintain adequate safeguards for personal data transfer. As a
result, we may be unsuccessful in maintaining appropriate compliance mechanisms for our transfer and receipt of personal data from the EU or the United
Kingdom and to the U.S. and may be at risk of experiencing reluctance or refusal of European or multi-national partners, clinical trial sites or other third
parties with whom we do business and incurring potential regulatory penalties, which may have an adverse effect on our reputation and business.

As supervisory authorities continue to issue further guidance on personal data transfers, we could suffer additional costs, complaints, or regulatory
investigations or fines, and if we are otherwise unable to transfer personal data between and among countries and regions in which we operate, it could
affect the manner in which we provide our services, the geographical location or segregation of our relevant systems and operations, and could adversely
affect our financial results.

In the United States, state and federal lawmakers and regulatory authorities have increased their attention on the collection and use of personal information.
In the United States, non-sensitive personal information generally may be used under current rules and regulations, subject to certain restrictions, so long as
the person does not affirmatively “opt-out” of the collection or use of such data. If an “opt-in” model or additional required “opt-outs”, were to be adopted
in the United States, less data would be available, and the cost of data would be higher. For example, California recently enacted the CCPA, which became
operative on January 1, 2020 and became enforceable by California Attorney General on July 1, 2020, along with related regulations which came into force
on August 14, 2020.

The CCPA gives California residents new rights to access and require deletion of their personal information, opt out of certain personal information
sharing, and receive detailed information about how their personal information is collected, used, and shared. Given that CCPA enforcement began on July
1, 2020, it remains unclear whether modifications will be made to this legislation or how it will be interpreted. Additionally, the CCPA has prompted a
number of proposals for new federal and state-level privacy legislation. Further, in November 2020, California voters passed the California Privacy Rights
Act (CPRA). The CPRA, which is expected to take effect on January 1, 2023 and to create obligations with respect to certain data relating to consumers as
of January 1, 2022, significantly expands the CCPA, including by introducing additional obligations such as data minimization and storage limitations,
granting additional rights to consumers, such as correction of personal information and additional opt-out rights, and creates a new entity, the California
Privacy Protection Agency, to implement and enforce the law. The CCPA and CPRA present many unresolved compliance complexities. The CCPA and
CPRA may increase our compliance costs and potential liability. In addition to the CCPA, numerous other states’ legislatures are considering similar laws
that will require ongoing compliance efforts and investment.

Additionally, if our operations are found to be in violation of any such health care and data privacy laws and regulations, we may be subject to penalties,
including administrative, civil and criminal penalties, monetary damages, disgorgement, imprisonment, the curtailment or restructuring of our operations,
loss of eligibility to obtain approvals from the FDA or foreign regulatory authorities, fees from regulators, fines, significant settlements or judgments
resulting from the CCPA’s private right of action, or exclusion from participation in government contracting, healthcare reimbursement or other government
programs, including Medicare and Medicaid, any of which could adversely impact our financial results. Although effective compliance programs can
mitigate the risk of investigation and prosecution for violations of these laws, these risks cannot be entirely eliminated. Any action against us for an alleged
or suspected violation by a private party or governmental agency could cause us to incur significant legal expenses, adversely impact our reputation, and
could divert our management’s attention from the operation of our business, even if our defense is successful. In addition, achieving and sustaining
compliance with applicable laws and regulations may be costly to us in terms of money, time and resources.

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The insurance coverage and reimbursement status of newly approved products is uncertain. Any products we develop may become subject to
unfavorable pricing regulations, third-party coverage and reimbursement practices or healthcare reform initiatives, thereby harming our business.

The regulations that govern marketing approvals, pricing, coverage and reimbursement for new drugs vary widely from country to country. Many countries
require approval of the sale price of a drug before it can be marketed. The pricing review period begins after marketing or product licensing approval is
granted in most cases. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial
approval is granted. Although we intend to monitor these regulations, our momelotinib program is currently in development and we will not be able to
assess the impact of price regulations for a few years. As a result, we might obtain regulatory approval for a product in a particular country, but then be
subject to price regulations that delay our commercial launch of the product and negatively impact the revenues we are able to generate from the sale of the
product in that country.  

Our ability to commercialize any products successfully also will depend in part on the extent to which coverage and adequate reimbursement for these
products and related treatments will be available from government health administration authorities, private health insurers and other third-party payors. In
many jurisdictions, a product candidate must be approved for reimbursement before it can be approved for sale in that jurisdiction. Obtaining coverage and
reimbursement approval of a product from a government or other third-party payor is a time-consuming and costly process that could require us to provide
to the payor supporting scientific, clinical and cost-effectiveness data for the use of our products. If we are not currently capturing the scientific and clinical
data that will be required for reimbursement approval, we may be required to conduct additional trials, which may delay or suspend reimbursement
approval. Additionally, in the United States, no uniform policy of coverage and reimbursement for products exists among third-party payors. Therefore,
coverage and reimbursement for products can differ significantly from payor to payor. As a result, the coverage determination process is often a time-
consuming and costly process that will require us to provide scientific and clinical support for the use of momelotinib to each payor separately, with no
assurance that coverage and adequate reimbursement will be obtained.

A primary trend in the U.S. healthcare industry and elsewhere is cost containment. Government authorities and third-party payors have attempted to control
costs by limiting coverage and the amount of reimbursement for particular medications. In many countries, the prices of medical products are subject to
varying price control mechanisms as part of national health systems. In general, the prices of medicines under such systems are substantially lower than in
the United States. Other countries allow companies to fix their own prices for medicines, but monitor and control company profits. Additional foreign price
controls or other changes in pricing regulation could restrict the amount that we are able to charge for our product candidates. Accordingly, in markets
outside the United States, the reimbursement for products may be reduced compared with the United States and may be insufficient to generate
commercially reasonable revenue and profits.

In the United States and markets in other countries, patients generally rely on third-party payors to reimburse all or part of the costs associated with their
treatment. Adequate coverage and reimbursement from governmental healthcare programs, such as Medicare and Medicaid, and commercial payors is
critical to new product acceptance. Even if we succeed in bringing one or more products to the market, these products may not be considered cost-effective,
and the amount reimbursed for any products may be insufficient to allow us to sell our products on a competitive basis. Because our programs are still in
clinical development, we are unable at this time to determine their cost effectiveness or the likely level or method of reimbursement. Increasingly, the third-
party payors, such as government and private insurance plans, who reimburse patients or healthcare providers, are requiring that drug companies provide
them with predetermined discounts from list prices, and are seeking to reduce the prices charged or the amounts reimbursed for pharmaceutical products. If
the level of reimbursement provided for any products we develop is inadequate in light of our development and other costs, our return on investment could
be adversely affected.

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The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (MMA), established the Medicare Part D program to provide a voluntary
prescription drug benefit to patients with disabilities and seniors.  Under Part D, Medicare beneficiaries may enroll in prescription drug plans offered by
private entities that will provide coverage of outpatient prescription drugs, such as momelotinib, if approved.  Medicare Part D coverage is not
standardized. Part D prescription drug plan sponsors are not required to pay for all covered Part D drugs, and each drug plan can develop its own drug
formulary that identifies which drugs it will cover and at what tier or level. However, Part D prescription drug formularies must include drugs within each
therapeutic category and class of covered Part D drugs, though not necessarily all the drugs in each category or class. Any formulary used by a Part D
prescription drug plan must be developed and reviewed by a pharmacy and therapeutic committee.

The Bipartisan Budget Act of 2018 also amended the ACA, effective January 1, 2019, by increasing the point-of-sale discount that is owed by
pharmaceutical manufacturers who participate in Medicare Part D and closing the coverage gap in most Medicare drug plans, commonly referred to as the
“donut hole.” CMS published a final rule permitting further collections and payments to and from certain ACA qualified health plans and health insurance
issuers under the ACA risk adjustment program in response to the outcome of federal district court litigation regarding the method CMS uses to determine
this risk adjustment. In addition, CMS has published a final rule to give states greater flexibility, starting in 2020, in setting benchmarks for insurers in the
individual and small group marketplaces, which may have the effect of relaxing the essential health benefits required under the ACA for plans sold through
such marketplaces. The American Taxpayer Relief Act of 2012, or ATRA, among other things, reduced Medicare payments to several providers, including
hospitals, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Other legislative
changes include aggregate reductions to Medicare payments to providers of up to 2% per fiscal year pursuant to the Budget Control Act of 2011, which
began in 2013 and will remain in effect through 2030 with the exception of a temporary suspension implemented under various COVID-19 relief
legislation from May 1, 2020 through March 31, 2021, unless additional Congressional action is taken.

In addition, other legislative changes have been proposed and adopted since the ACA was enacted. There has been increasing legislative and enforcement
interest in the United States with respect to specialty drug pricing practices. Specifically, there have been several recent U.S. Congressional inquiries and
proposed federal and state legislation designed to, among other things, bring more transparency to drug pricing, reduce the cost of prescription drugs under
Medicare, review the relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for
drugs. At the federal level, the Trump administration’s budget for fiscal year 2021 includes allowance to support legislative proposals seeking to reduce
drug prices, increase competition, lower out-of-pocket drug costs for patients, and increase patient access to lower-cost generic and biosimilar drugs.
Additionally, the Trump administration previously released a “Blueprint” to lower drug prices and reduce out of pocket costs of drugs that contained
proposals to increase manufacturer competition, increase the negotiating power of certain federal healthcare programs, incentivize manufacturers to lower
the list price of their products and reduce the out of pocket costs of drug products paid by consumers. On July 24, 2020 and September 13, 2020, the Trump
administration announced several executive orders related to prescription drug pricing that seek to implement several of the administration's proposals. The
FDA also released a final rule in September 2020 providing guidance for states to build and submit importation plans for drugs from Canada. Further, in
November 2020, HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors
under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The rule also creates a new safe harbor
for price reductions reflected at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit managers and
manufacturer. It is these and future regulations that the Biden administration may take will affect our business.

At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical
product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and
transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. In addition, regional health care
authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be
included in their prescription drug and other health care programs. These measures could reduce the ultimate demand for our products, once approved, or
put pressure on our product pricing. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which
could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced demand for
momelotinib or additional pricing pressures.

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We may face difficulties from changes to current regulations and future legislation. Healthcare legislative measures aimed at reducing healthcare costs
may have a material adverse effect on our business and results of operations.

The United States and many foreign jurisdictions have enacted or proposed legislative and regulatory changes affecting the healthcare system that could
prevent or delay marketing approval of our product candidates or any future product candidates, restrict or regulate post-approval activities and affect our
ability to profitably sell a product for which we obtain marketing approval. Changes in regulations, statutes or the interpretation of existing regulations
could impact our business in the future by requiring, for example:

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changes to our manufacturing arrangements;

additions or modifications to product labeling;

the recall or discontinuation of our products; or

additional record-keeping requirements. If any such changes were to be imposed, they could adversely affect the operation of our business.

Our revenue prospects could be affected by changes in healthcare spending and policy in the United States and abroad. We operate in a highly regulated
industry and new laws, regulations or judicial decisions, or new interpretations of existing laws, regulations or decisions, related to healthcare availability,
the method of delivery or payment for healthcare products and services could negatively impact our business, operations and financial condition.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at broadening the
availability of healthcare and containing or lowering the cost of healthcare. We cannot predict the initiatives that may be adopted in the future, including
revisions to the PPACA. The continuing efforts of the government, insurance companies, managed care organizations and other payors of healthcare
services to contain or reduce costs of healthcare and/or impose price controls may adversely affect:

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the demand for our product candidates, if we obtain regulatory approval;

our ability to set a price that we believe is fair for our products;

our ability to obtain coverage and reimbursement approval for a product;

our ability to generate revenue and achieve or maintain profitability;

the level of taxes that we are required to pay; and

the availability of capital.

Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors, which
may adversely affect our future profitability.

We expect that the PPACA, as well as other healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria
and in additional downward pressure on the price that we receive for any approved product. Further, it is possible that additional governmental action is
taken to address the COVID-19 pandemic. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction
in payments from private payors. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate
revenue, attain profitability or commercialize our product candidates. Legislative and regulatory proposals have been made to expand post-approval
requirements and restrict sales and promotional activities for biotechnology products. We cannot be sure to what extent these and future legislative and
regulatory efforts, whether FDA regulations, guidance or interpretations will be changed, or what the impact of such changes on the marketing approvals of
our product candidates, if any, may be. In addition, increased scrutiny by Congress of the FDA’s approval process may significantly delay or prevent
marketing approval, as well as subject us to more stringent product labeling and post-marketing testing and other requirements.

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Disruptions at the FDA, the Securities and Exchange Commission and other government agencies caused by funding shortages or global health
concerns could hinder their ability to hire and retain key leadership and other personnel, or otherwise prevent new or modified products from being
developed, approved or commercialized in a timely manner or at all, or otherwise prevent those agencies from performing normal business functions on
which the operation of our business may rely, which could negatively impact our business.

The ability of the FDA to review and approve new products can be affected by a variety of factors, including government budget and funding levels, ability
to hire and retain key personnel and accept the payment of user fees, and statutory, regulatory, and policy changes, and other events that may otherwise
affect the FDA’s ability to perform routine functions. Average review times at the agency have fluctuated in recent years as a result. In addition,
government funding of the Securities and Exchange Commission, or the SEC, and other government agencies on which our operations may rely, including
those that fund research and development activities is subject to the political process, which is inherently fluid and unpredictable.

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs to be reviewed and/or approved by necessary government
agencies, which would adversely affect our business. For example, in recent years, including in 2018 and 2019, the U.S. government shut down several
times and certain regulatory agencies, such as the FDA and the SEC, had to furlough critical employees and stop critical activities. Separately, in response
to the COVID-19 pandemic, on March 10, 2020 the FDA announced its intention to postpone most inspections of foreign manufacturing facilities and
products through April 2020. On March 18, 2020, the FDA announced its intention to temporarily postpone routine surveillance inspections of domestic
manufacturing facilities and provided guidance regarding the conduct of clinical trials. In May 2020, FDA announced that it will continue to postpone
domestic and foreign routine surveillance inspections due to COVID-19. While the FDA indicated that it will consider alternative methods for inspections
and could exercise discretion on a case-by-case basis to approve products based on a desk review, if a prolonged government shutdown occurs, or if global
health concerns continue to prevent the FDA or other regulatory authorities from conducting their regular inspections, reviews, or other regulatory
activities, it could significantly impact the ability of the FDA to timely review and process our regulatory submissions, which could have a material adverse
effect on our business. Further, future government shutdowns or delays could impact our ability to access the public markets and obtain necessary capital in
order to properly capitalize and continue our operations.

Obtaining and maintaining regulatory approval for momelotinib or any future product candidates in one jurisdiction does not mean that we will be
successful in obtaining regulatory approval of any of our product candidates in other jurisdictions.

Obtaining and maintaining regulatory approval for momelotinib or any future product candidates in one jurisdiction does not guarantee that we will be able
to obtain or maintain regulatory approval in any other jurisdiction, while a failure or delay in obtaining regulatory approval in one jurisdiction may have a
negative effect on the regulatory approval process in others. For example, even if the FDA grants marketing approval for a product candidate, comparable
regulatory authorities in foreign jurisdictions must also approve the manufacturing, marketing and promotion of the product candidate in those countries.
Approval procedures vary among jurisdictions and can involve requirements and administrative review periods different from, and greater than, those in the
United States, including additional preclinical studies or clinical trials as clinical studies conducted in one jurisdiction may not be accepted by regulatory
authorities in other jurisdictions. In many jurisdictions outside the United States, a product candidate must be approved for reimbursement before it can be
approved for sale in that jurisdiction. In some cases, the price that we intend to charge for our products is also subject to approval.

We may also submit marketing applications in other countries. Regulatory authorities in jurisdictions outside of the United States have requirements for
approval of product candidates with which we must comply prior to marketing in those jurisdictions. Obtaining foreign regulatory approvals and
compliance with foreign regulatory requirements could result in significant delays, difficulties and costs for us and could delay or prevent the introduction
of our products in certain countries. If we fail to comply with the regulatory requirements in international markets or receive applicable marketing
approvals, our target market will be reduced and our ability to realize the full market potential of momelotinib or any future product candidates will be
harmed.

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If we or our third-party manufacturers fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or
penalties or incur costs that could have a material adverse effect on the success of our business.

Our research and development activities involve the controlled use of potentially hazardous substances, including chemical and biological materials, by
ourselves and our third-party manufacturers. Our manufacturers are subject to federal, state and local laws and regulations in the United States and abroad
governing laboratory procedures and the use, manufacture, storage, handling and disposal of medical and hazardous materials. Although we believe that
our manufacturers’ procedures for using, handling, storing and disposing of these materials comply with legally prescribed standards, we cannot
completely eliminate the risk of contamination or injury resulting from medical or hazardous materials. As a result of any such contamination or injury, we
may incur liability or local, city, state or federal authorities may curtail the use of these materials and interrupt our business operations. In the event of an
accident, we could be held liable for damages or penalized with fines, and the liability could exceed our resources. We do not have any insurance for
liabilities arising from medical or hazardous materials. Compliance with applicable environmental, health and safety laws and regulations is expensive, and
current or future environmental regulations may impair our research, development and production efforts, which could harm our business, prospects,
financial condition or results of operations.

Although we maintain workers’ compensation insurance to cover us for costs and expenses, we may incur due to injuries to our employees resulting from
the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for
environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive
materials.

In addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations. These current or
future laws and regulations may impair our research, development or production efforts. Failure to comply with these laws and regulations also may result
in substantial fines, penalties or other sanctions.

We are subject to certain U.S. and foreign anti-corruption, anti-money laundering, export control, sanctions, and other trade laws and regulations. We
can face serious consequences for violations.

Among other matters, U.S. and foreign anti-corruption, anti-money laundering, export control, sanctions, and other trade laws and regulations, which are
collectively referred to as Trade Laws, prohibit companies and their employees, agents, clinical research organizations, legal counsel, accountants,
consultants, contractors, and other partners from authorizing, promising, offering, providing, soliciting, or receiving directly or indirectly, corrupt or
improper payments or anything else of value to or from recipients in the public or private sector. Violations of trade laws can result in substantial criminal
fines and civil penalties, imprisonment, the loss of trade privileges, debarment, tax reassessments, breach of contract and fraud litigation, reputational harm,
and other consequences. We have direct or indirect interactions with officials and employees of government agencies or government-affiliated hospitals,
universities, and other organizations. We also expect our non-U.S. activities to increase in time. We plan to engage third parties for clinical trials and/or to
obtain necessary permits, licenses, patent registrations, and other regulatory approvals and we can be held liable for the corrupt or other illegal activities of
our personnel, agents, or partners, even if we do not explicitly authorize or have prior knowledge of such activities.

The Tax Cuts and Jobs Act could increase our tax burden and adversely affect our business and financial condition.

In December 2017, the U.S. government enacted comprehensive tax legislation referred to as the Tax Cuts and Jobs Act (Tax Act) that includes significant
changes to the taxation of business entities. These changes include, among others, (i) a permanent reduction to the corporate income tax rate, (ii) revisions
to uses and limitations of net operating loss carryforwards (iii) a partial limitation on the deductibility of business interest expense, and (iv) a shift of the
U.S. taxation of multinational corporations from a tax on worldwide income to a participation exemption system (along with certain rules designed to
prevent erosion of the U.S. income tax base).

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In addition, beginning in 2022, the tax legislation will require U.S. research and experimental expenditures to be capitalized and amortized ratably over a
five-year period. Any such expenditures attributable to research conducted outside the U.S. must be capitalized and amortized over a 15-year period.
Further, the Tax Act, among other things, reduces the orphan drug credit from 50% to 25% of qualifying expenditures. When and if we become profitable,
this amortization of research and experimental expenditures and reduction in orphan drug tax credits may result in an increased federal income tax burden,
as it may cause us to pay federal income taxes earlier under the revised tax law than under the prior law and, despite being partially off-set by a reduction in
the corporate tax rate from a top marginal rate of 35% to a flat rate of 21%, may increase our total federal tax liability.

Risks Related to Our Intellectual Property

If we are not able to obtain and enforce patent protection for our technologies or momelotinib, development and commercialization of our product
candidates may be adversely affected.

Our success depends in part on our ability to obtain and maintain patents and other forms of intellectual property rights, methods used to manufacture
momelotinib and methods for treating patients using momelotinib, as well as our ability to preserve our trade secrets, to prevent third parties from
infringing upon our proprietary rights and to operate without infringing upon the proprietary rights of others.

We and our future licensors and licensees may not be able to apply for or prosecute patents on certain aspects of momelotinib or our technologies at a
reasonable cost in a timely fashion or at all. It is also possible that we or our current licensors, or any future licensors or licensees, will fail to identify
patentable aspects of inventions made in the course of development and commercialization activities before it is too late to obtain patent protection on
them. Therefore, our patents and applications may not be prosecuted and enforced in a manner consistent with the best interests of our business. It is
possible that defects of form in the preparation or filing of our patents or patent applications may exist, or may arise in the future, such as with respect to
proper priority claims, inventorship, claim scope or patent term adjustments. If our current licensors, or any future licensors or licensees, are not fully
cooperative or disagree with us as to the prosecution, maintenance or enforcement of any patent rights, such patent rights could be compromised and we
might not be able to prevent third parties from making, using, and selling competing products. If there are material defects in the form or preparation of our
patents or patent applications, such patents or applications may be invalid and unenforceable. Moreover, our competitors may independently develop
equivalent knowledge, methods, and know-how. Any of these outcomes could impair our ability to prevent competition from third parties, which may have
an adverse impact on our business, financial condition and operating results.

There is no guarantee that any of our pending patent applications will result in issued or granted patents, that any of our issued or granted patents will not
later be found to be invalid or unenforceable or that any issued or granted patents will include claims that are sufficiently broad to cover momelotinib or our
technologies or to provide meaningful protection from our competitors. Moreover, the patent position of oncology companies can be highly uncertain
because it involves complex legal and factual questions. We will be able to protect our proprietary rights from unauthorized use by third parties only to the
extent that our current and future proprietary technology and momelotinib are covered by valid and enforceable patents or are effectively maintained as
trade secrets. If third parties disclose or misappropriate our proprietary rights, it may materially and adversely impact our position in the market.

The U.S. Patent and Trademark Office (USPTO) and various foreign governmental patent agencies require compliance with a number of procedural,
documentary, fee payment and other provisions during the patent process. There are situations in which noncompliance can result in abandonment or lapse
of a patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. In such an event, competitors might be able
to enter the market earlier than would otherwise have been the case. The standards applied by the USPTO and foreign patent offices in granting patents are
not always applied uniformly or predictably. For example, there is no uniform worldwide policy regarding patentable subject matter or the scope of claims
allowable in oncology patents. Moreover, changes in either the patent laws or in the interpretations of patent laws in the United States and other countries
may diminish the value of our intellectual property. As such, we do not know the degree of future protection that we will have on our proprietary products
and technology. While we will endeavor to try to protect momelotinib with intellectual property rights such as patents, as appropriate, the process of
obtaining patents is time-consuming, expensive and sometimes unpredictable.

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Further, patents have a limited lifespan. In the United States, the natural expiration of a patent is generally 20 years after it is filed (or 20 years after the
filing date of the first non-provisional US patent application to which it claims priority). Various extensions may be available; however, the life of a patent,
and the protection it affords, is limited. Without patent protection for momelotinib, we may be open to competition from generic versions of momelotinib.
Further, the extensive period of time between patent filing and regulatory approval for a product candidate limits the time during which we can market a
product candidate under patent protection, which may particularly affect the profitability of momelotinib.

If we are unable to protect the confidentiality of our trade secrets our business and competitive position would be harmed.

In addition to seeking patent protection for certain aspects of momelotinib and our technologies, we also consider trade secrets, including confidential and
unpatented know-how important to the maintenance of our competitive position. We protect trade secrets and confidential and unpatented know-how, in
part, by entering into non-disclosure and confidentiality agreements with parties who have access to such knowledge, such as our employees, outside
scientific collaborators, CROs, contract manufacturers, consultants, advisors and other third parties. We also enter into confidentiality and invention or
patent assignment agreements with our employees and consultants that obligate them to maintain confidentiality and assign their inventions to us.

Despite these efforts, any of these parties may breach the agreements and disclose our proprietary information, including our trade secrets, and we may not
be able to obtain adequate remedies for such breaches. Enforcing a claim that a party illegally disclosed or misappropriated a trade secret is difficult,
expensive and time-consuming, and the outcome is unpredictable. In addition, some courts in the United States and certain foreign jurisdictions are less
willing or unwilling to protect trade secrets. If any of our trade secrets were to be lawfully obtained or independently developed by a competitor, we would
have no right to prevent them from using that technology or information to compete with us. If any of our trade secrets were to be disclosed to or
independently developed by a competitor, our competitive position would be harmed.

Changes in patent law could diminish the value of patents in general, thereby impairing our ability to protect momelotinib.

Numerous recent changes to the patent laws and proposed changes to the rules of the USPTO may have a significant impact on our ability to protect our
technology and enforce our intellectual property rights. For example, the Leahy-Smith America Invents Act (AIA) enacted in 2011 involves significant
changes in patent legislation. An important change introduced by the AIA is that, as of March 16, 2013, the United States transitioned to a “first-to-file”
system for deciding which party should be granted a patent when two or more patent applications are filed by different parties claiming the same invention.
A third party that files a patent application in the USPTO after that date but before us could therefore be awarded a patent covering an invention of ours
even if we had made the invention before it was made by the third party. This will require us to be cognizant going forward of the time from invention to
filing of a patent application.

Further, the Supreme Court has ruled on several patent cases in recent years, some of which cases either narrow the scope of patent protection available in
certain circumstances or weaken the rights of patent owners in certain situations. These changes have led to increasing uncertainty with regard to the scope
and value of our issued patents and to our ability to obtain patents in the future.

Among some of the other changes introduced by the AIA are changes that limit where a patentee may file a patent infringement suit and providing
opportunities for third parties to challenge any issued patent in the USPTO. This applies to all of our U.S. patents, even those issued before March 16,
2013. Because of a lower evidentiary standard in USPTO proceedings compared to the evidentiary standard in United States federal court necessary to
invalidate a patent claim, a third party could potentially provide evidence in a USPTO proceeding sufficient for the USPTO to hold a claim invalid even
though the same evidence would be insufficient to invalidate the claim if first presented in a district court action. Accordingly, a third party may attempt to
use the USPTO procedures to invalidate our patent claims that would not have been invalidated if first challenged by the third party as a defendant in a
district court action.

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Depending on decisions by the U.S. Congress, the U.S. federal courts, the USPTO or similar authorities in foreign jurisdictions, the laws and regulations
governing patents could change in unpredictable ways that may weaken our and our licensors’ ability to obtain new patents or to enforce existing patents
we and our licensors or partners may obtain in the future.

Once granted, patents may remain open to opposition, interference, re-examination, post-grant review, inter partes review, nullification derivation and
opposition proceedings in court or before patent offices or similar proceedings for a given period after allowance or grant, during which time third parties
can raise objections against such initial grant. In the course of such proceedings, which may continue for a protracted period of time, the patent owner may
be compelled to limit the scope of the allowed or granted claims thus attacked, or may lose the allowed or granted claims altogether.

We or any future strategic partners may become subject to third-party claims or litigation alleging infringement of patents or other proprietary rights or
seeking to invalidate patents or other proprietary rights.

We or any future strategic partners may be subject to third-party claims for infringement or misappropriation of patent or other proprietary rights that
prevent us from developing and commercializing our products. If we, our licensors or any future strategic partners are found to infringe a third-party patent
or other intellectual property rights, we could be required to pay substantial damages, potentially including treble damages and attorneys’ fees, if we are
found to have willfully infringed. In addition, we or any future strategic partners may choose to seek, or be required to seek, a license from a third party,
which may not be available on acceptable terms, if at all. Even if a license can be obtained on acceptable terms, the rights may be non-exclusive, which
could give our competitors access to the same technology or intellectual property rights licensed to us. If we fail to obtain a required license, we may be
unable to effectively market product candidates, which could limit our ability to generate revenue or achieve profitability and possibly prevent us from
generating revenue sufficient to sustain our operations. Alternatively, we may need to redesign our infringing products, which may be impossible or require
substantial time and monetary expenditure. In addition, we may find it necessary to pursue claims or initiate lawsuits to protect or enforce our patent or
other intellectual property rights. The cost to us in defending or initiating any litigation or other proceeding relating to patent or other proprietary rights,
even if resolved in our favor, could be substantial, and litigation would divert our management’s attention. Some of our competitors may be able to sustain
the costs of complex patent litigation more effectively than we can because they have substantially greater resources. Uncertainties resulting from the
initiation and continuation of patent litigation or other proceedings could delay our research and development efforts and limit our ability to continue our
operations.

We may be involved in lawsuits to protect or enforce our patents, which could be expensive, time-consuming and unsuccessful.

Competitors may infringe our patents or the patents of our licensors. To counter infringement or unauthorized use, we may be required to file infringement
claims, which can be expensive and time-consuming. If we were to initiate legal proceedings against a third party to enforce a patent covering one of our
products or our technology, the defendant could counterclaim that our patent is invalid or unenforceable. In patent litigation in the United States, defendant
counterclaims alleging invalidity or unenforceability are commonplace. Grounds for a validity challenge could be an alleged failure to meet any of several
statutory requirements, for example, lack of novelty, obviousness or non-enablement. Grounds for an unenforceability assertion could be an allegation that
someone connected with prosecution of the patent withheld relevant information from the USPTO, or made a misleading statement, during prosecution.
The outcome following legal assertions of invalidity and unenforceability during patent litigation is unpredictable. With respect to the validity question, for
example, we cannot be certain that there is no invalidating prior art, of which we and the patent examiner were unaware during prosecution. If a defendant
were to prevail on a legal assertion of invalidity or unenforceability, we would lose at least part, and perhaps all, of the patent protection on one or more of
our products or certain aspects of our platform technology. Such a loss of patent protection could have a material adverse impact on our business. Patents
and other intellectual property rights also will not protect our technology if competitors design around our protected technology without legally infringing
our patents or other intellectual property rights.

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In addition, in an infringement proceeding, a court may refuse to stop the other party from using the technology at issue on the grounds that our patents do
not cover the technology in question. An adverse result in any litigation or defense proceedings could put one or more of our patents at risk of being
invalidated, held unenforceable, or interpreted narrowly and could put our patent applications at risk of not issuing. Defense of these claims, regardless of
their merit, would involve substantial litigation expense and would be a substantial diversion of employee resources from our business.

Interference proceedings provoked by third parties or brought by the USPTO may be necessary to determine the priority of inventions with respect to our
patents or patent applications or those of our licensors. An unfavorable outcome could result in a loss of our current patent rights and could require us to
cease using the related technology or to attempt to license rights to it from the prevailing party. Our business could be harmed if the prevailing party does
not offer us a license on commercially reasonable terms. Litigation or interference proceedings may result in a decision adverse to our interests and, even if
we are successful, may result in substantial costs and distract our management and other employees. We may not be able to prevent, alone or with our
licensors, misappropriation of our trade secrets or confidential information, particularly in countries where the laws may not protect those rights as fully as
in the United States.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our
confidential information could be compromised by disclosure during this type of litigation. In addition, there could be public announcements of the results
of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could have a
substantial adverse effect on the price of our common stock.

Obtaining and maintaining our patent protection depends on compliance with various procedural, document submission, fee payment and other
requirements imposed by governmental patent agencies, and our patent protection could be reduced or eliminated for non-compliance with these
requirements.

We have limited foreign intellectual property rights and may not be able to protect our intellectual property rights throughout the world.

We have limited intellectual property rights outside the United States. Filing, prosecuting and defending patents on product candidates in all countries
throughout the world would be prohibitively expensive, and our intellectual property rights in some countries outside the United States can be less
extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as
federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside
the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use
our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise infringing
products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our
products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems
of certain countries, particularly certain developing countries, do not favor the enforcement of patents, trade secrets and other intellectual property
protection, particularly those relating to oncology products, which could make it difficult for us to stop the infringement of our patents or marketing of
competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in
substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted
narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits
that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our
intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop
or license.

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If we fail to comply with our obligations under our purchase agreement with Gilead, we may be required to pay damages.

In connection with our acquisition of momelotinib from Gilead, we are required to make aggregate milestone payments of up to $190.0 million to Gilead
upon the achievement of certain regulatory and commercial milestones, as well as low double-digit to high-teens percent tiered combined royalties based
upon net sales and additional tiered milestone payments upon reaching certain sales milestones. If we breach any of these obligations, we may be required
to indemnify the Seller, subject to certain limitations set forth in the momelotinib purchase.

We may be subject to claims that our employees, consultants or independent contractors have wrongfully used or disclosed confidential information of
third parties.

We have received confidential and proprietary information from third parties. In addition, we employ individuals who were previously employed at other
oncology companies. We may be subject to claims that we or our employees, consultants or independent contractors have inadvertently or otherwise used
or disclosed confidential information of these third parties or our employees’ former employers. Litigation may be necessary to defend against these claims.
Even if we are successful in defending against these claims, litigation could result in substantial cost and be a distraction to our management and
employees.

Risks Related to Ownership of Our Common Stock

The market price of our common stock has been and may continue to be volatile, and you may be unable to sell your shares at or above the price at
which you purchased them.

The market price of our common stock has been and may continue to be subject to wide fluctuations. For example, we experienced a significant decrease in
our stock price after we announced the suspension of the development of our former lead product candidate PNT2258 and the DNAi platform in June 2016
and after we announced the preliminary clinical data from our two Phase 1/2 studies of SRA737 in June 2019. In addition, the trading prices for our
common stock and other biopharmaceutical companies have been highly volatile as a result of the COVID-19 pandemic. Factors affecting the market price
of our common stock include, but are not limited to:

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the success of existing or new competitive products;

the timing and results of development activities related to our product candidates including momelotinib;

our capital requirements, financings and the related dilution;

the commencement, enrollment or results of future clinical trials we may conduct, or changes in the development status of our product
candidates including momelotinib;

any delay in our regulatory filings for our product candidates including momelotinib and any adverse development or perceived adverse
development with respect to the applicable regulatory authority’s review of such filings;  

any disputes with Gilead regarding our acquisition of momelotinib and assumption of the related clinical trials;

our ability to acquire or in-license new product candidates to grow our pipeline;  

adverse results or delays in preclinical studies or clinical trials;

changes in laws or regulations applicable to our product candidates including momelotinib, including but not limited to clinical trial
requirements for approvals;

adverse developments concerning our manufacturers;

our inability to obtain adequate product supply for any approved product or inability to do so at acceptable prices;

our inability to establish collaborations if needed, or to out-license our product candidates including momelotinib or technologies on favorable
terms or at all;

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our failure to commercialize our product candidates including momelotinib;

additions or departures of key scientific or management personnel;

unanticipated serious safety concerns related to the use of our product candidates including momelotinib;

announcements of significant acquisitions, strategic partnerships, joint ventures or capital commitments by us or our competitors;

the size and growth of our initial target markets;

our ability to successfully treat additional types of cancers or at different stages;

actual or anticipated variations in quarterly operating results;

our failure to meet the estimates and projections of the investment community or that we may otherwise provide to the public;

publication of research reports about us or our industry, or immunotherapy in particular, or positive or negative recommendations or withdrawal
of research coverage by securities analysts;

changes in the market valuations of similar companies;

overall performance of the equity markets;

sales of our common stock by us or our stockholders in the future;

the low trading volume and limited public market for our common stock;

disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain patent protection for
our technologies;

significant lawsuits, including patent or stockholder litigation;

actions instituted by activist shareholders or others;

general political and economic conditions, including global pandemics such as COVID-19;

fiscal and monetary stimulus measures to counteract the impact of the COVID-19 pandemic; and

other events or factors, many of which are beyond our control.

In addition, the stock market in general, and oncology companies in particular, have experienced extreme price and volume fluctuations that have often
been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market
price of our common stock, regardless of our actual operating performance. Securities class action litigation is often instituted against companies following
periods of volatility in the market price of a company’s securities. For example, we have previously vigorously defended purported securities class action
lawsuits against us and certain of our executive officers. This type of litigation could result in substantial costs and a diversion of management’s attention
and resources, which could harm our business, operating results or financial condition.

Market volatility arising from the COVID-19 pandemic may lead to increased shareholder activism if we experience a market valuation that they believe
are not reflective of their intrinsic value. Activist campaigns that contest or conflict with our strategic direction or seek changes in the composition of our
board of directors could have an adverse effect on our operating results and financial condition.

75

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The issuance or sale of shares of our common stock, or rights to acquire shares of our common stock could depress the trading price of our common
stock.

We may conduct future offerings of our common stock, preferred stock or other securities that are convertible into or exercisable for our common stock to
finance our operations or fund acquisitions, or for other purposes. For example, in November 2019, we conducted a public equity offering where we raised
net proceeds of approximately $97.7 million in a substantially dilutive transaction to our pre-existing investors. In August 2020, we filed a prospectus
supplement pursuant to which it can issue and sell an aggregate of up to $20.0 million of our common stock from time to time in ATM offerings. During
the year ended December 31, 2020, we sold 732,752 shares under the ATM program for net proceeds of $8.9 million, net of commissions and offering
expenses. In January 2021, we sold an additional 450,000 shares under the ATM program for proceeds of $7.1 million, net of commissions. In addition, in
February 2021, we filed a prospectus supplement pursuant to which we can issue and sell an aggregate of up to $30.0 million of our common stock from
time to time in ATM offerings. If we issue additional shares of our common stock or rights to acquire shares of our common stock, if any of our existing
stockholders sells a substantial amount of our common stock, or if the market perceives that such issuances or sales may occur, then the trading price of our
common stock, and, accordingly, the trading price of our common stock may significantly decrease. In addition, our issuance of additional shares of
common stock, including upon exercise of our outstanding warrants, will dilute the ownership interests of our existing common stockholders.

We incur significantly increased costs and devote substantial management time as a result of operating as a public company.

As a public company, we incur significant legal, accounting and other expenses that we did not incur as a private company. The Sarbanes-Oxley Act, the
Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing requirements of the stock exchange upon which our common stock is listed and
other applicable securities rules and regulations impose various requirements on public companies, including establishment and maintenance of effective
disclosure and financial controls and corporate governance practices. Our management and other personnel devote a substantial amount of time to these
compliance initiatives. Moreover, these rules and regulations increase our legal and financial compliance costs and make some activities more time-
consuming and costly. However, these rules and regulations are often subject to varying interpretations, in many cases due to their lack of specificity, and,
as a result, their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in
continuing uncertainty regarding compliance matters and higher costs necessitated by ongoing revisions to disclosure and governance practices.

Pursuant to Section 404, we are required to furnish a report by our management on our internal control over financial reporting. However, while we remain
a non-accelerated filer, we will not be required to include an attestation report on internal control over financial reporting issued by our independent
registered public accounting firm. To achieve compliance with Section 404 within the prescribed period, we are engaged in a process to document and
evaluate our internal control over financial reporting, which is both costly and challenging. In this regard, we will need to continue to dedicate internal
resources, potentially engage outside consultants and adopt a detailed work plan to assess and document the adequacy of internal control over financial
reporting, continue steps to improve control processes as appropriate, validate through testing that controls are functioning as documented and implement a
continuous reporting and improvement process for internal control over financial reporting. Despite our efforts, there is a risk that we will not be able to
conclude, within the prescribed timeframe or at all, that our internal control over financial reporting is effective as required by Section 404.

In addition, since it has been more than five years since we completed our initial public offering, we are no longer an “emerging growth company” and may
no longer take advantage of certain exemptions from various reporting requirements that are applicable to other public companies. This increase in
reporting requirements will further increase our compliance burden. As a “smaller reporting company,” however, we are still able to take advantage of
certain exemptions available to both emerging growth companies and smaller reporting companies.

76

We have in the past and may in the future identify material weaknesses or significant deficiencies in internal control over financial reporting. Under
standards established by the Public Company Accounting Oversight Board, a deficiency in internal control over financial reporting exists when the design
or operation of a control does not allow management or personnel, in the normal course of performing their assigned functions, to prevent or detect
misstatements on a timely basis. A material weakness is a deficiency or combination of deficiencies in internal control over financial reporting, such that
there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected and corrected on
a timely basis. We cannot assure you that there will not be additional material weaknesses or significant deficiencies that our independent registered public
accounting firm or we will identify. If we identify such issues or if we are unable to produce accurate and timely financial statements, our stock price may
be adversely affected and we may be unable to maintain compliance with the Nasdaq Stock Market listing requirements.        

Provisions in our restated certificate of incorporation and restated bylaws and Delaware law might discourage, delay or prevent a change in control of
our company or changes in our management and, therefore, depress the market price of our common stock.

Our restated certificate of incorporation and restated bylaws contain provisions that could depress the market price of our common stock by acting to
discourage, delay or prevent a change in control of our company or changes in our management that the stockholders of our company may deem
advantageous. These provisions, among other things:

•

•

•

•

•

•

•

•

•

establish a classified board of directors so that not all members of our board are elected at one time;

permit only the board of directors to establish the number of directors and fill vacancies on the board;

provide that directors may only be removed “for cause” and only with the approval of two-thirds of our stockholders;

require super-majority voting to amend some provisions in our restated certificate of incorporation and restated bylaws;

authorize the issuance of “blank check” preferred stock that our board could use to implement a stockholder rights plan (also known as a
“poison pill”);

eliminate the ability of our stockholders to call special meetings of stockholders;

prohibit stockholder action by written consent, which requires all stockholder actions to be taken at a meeting of our stockholders;

prohibit cumulative voting; and

establish advance notice requirements for nominations for election to our board or for proposing matters that can be acted upon by stockholders
at annual stockholder meetings.

In addition, Section 203 of the Delaware General Corporation Law may discourage, delay or prevent a change in control of our company. Section 203
imposes certain restrictions on mergers, business combinations and other transactions between us and holders of 15% or more of our common stock.

Section 22 of the Securities Act of 1933, as amended (the Securities Act), creates concurrent jurisdiction for federal and state courts over all claims brought
to enforce any duty or liability created by the Securities Act or the rules and regulations thereunder. In April 2020, we amended and restated our restated
bylaws to provide that the federal district courts of the United States of America will, to the fullest extent permitted by law, be the exclusive forum for
resolving any complaint asserting a cause of action arising under the Securities Act (a Federal Forum Provision). Our decision to adopt a Federal Forum
Provision followed a decision by the Supreme Court of the State of Delaware holding that such provisions are facially valid under Delaware law. While
there can be no assurance that federal or state courts will follow the holding of the Delaware Supreme Court or determine that the Federal Forum Provision
should be enforced in a particular case, application of the Federal Forum Provision means that suits brought by our stockholders to enforce any duty or
liability created by the Securities Act must be brought in federal court and cannot be brought in state court.

77

 
 
 
 
 
 
 
 
 
Section 27 of the Exchange Act creates exclusive federal jurisdiction over all claims brought to enforce any duty or liability created by the Exchange Act or
the rules and regulations thereunder. In addition, neither the exclusive forum provision nor the Federal Forum Provision applies to suits brought to enforce
any duty or liability created by the Exchange Act. Accordingly, actions by our stockholders to enforce any duty or liability created by the Exchange Act or
the rules and regulations thereunder must be brought in federal court.

Our stockholders will not be deemed to have waived our compliance with the federal securities laws and the regulations promulgated thereunder.

Any person or entity purchasing or otherwise acquiring or holding any interest in any of our securities shall be deemed to have notice of and consented to
our exclusive forum provisions, including the Federal Forum Provision. These provisions may limit a stockholders’ ability to bring a claim in a judicial
forum of their choosing for disputes with us or our directors, officers, or other employees, which may discourage lawsuits against us and our directors,
officers, and other employees.

Certain of our 5% stockholders hold a majority of the voting power and may be able to exert significant control over matters subject to stockholder
approval.

As of January 31, 2021, our executive officers, directors and 5% stockholders beneficially owned a majority of our outstanding voting shares. Further, four
of our current directors are affiliates of certain 5% stockholders. Therefore, these holders may have the ability to influence us through their ownership
position and through representation on our board of directors as they hold half of the board seats. These holders may be able to determine all matters
requiring stockholder approval. For example, these holders may be able to control the vote with respect to elections of directors, amendments of our
organizational documents, or approval of any merger, sale of assets, or other major corporate transaction. This may prevent or discourage unsolicited
acquisition proposals or offers for our common stock.

78

General Risks

We may be unable to adequately protect our information technology systems from cyberattacks, which could result in the disclosure of confidential
information, damage our reputation, and subject us to significant financial and legal exposure.

Cyberattacks upon systems, across industries, are increasing in their frequency, persistence, and sophistication, and are being conducted by sophisticated,
well-funded, and organized groups and individuals. These cyberattacks may occur on our systems or those of our third-party providers or partners.
Additionally, certain threats are designed to remain dormant or undetectable until launched against a target and we may not be able to implement adequate
preventative measures. Such cyberattacks could include wrongful conduct by hostile foreign governments, industrial espionage, the deployment of harmful
malware, ransomware attacks, denial-of-service, and/or other means to threaten data confidentiality, integrity and availability. Those engaging in attacks
may implement social engineering techniques to induce our employees or contractors to disclose passwords or other sensitive information or take other
actions to gain improper access to data or systems. Further, security breaches and other security incidents may result from employee or contractor
malfeasance, error or negligence or those of service providers on which we rely. A successful cyberattack could cause serious negative consequences for
us, including, without limitation, the disruption of operations, the loss or misappropriation of confidential business information and trade secrets,
unauthorized access to or other compromise of personal information or other sensitive information, and the disclosure of corporate strategic plans. We have
in the past experienced, and may in the future experience, a compromise of our data or information technology systems that results in one or more third
parties obtaining access to confidential information about our company or sensitive information about individuals, such as employees or clinical trial
participants. Although we devote resources to protect our information technology systems and continue to assess and, as necessitated, enhance our
cybersecurity protection, we realize that cyberattacks are a threat, and there can be no assurance that our efforts will prevent information security breaches
that would result in business, legal or reputational harm to us, or would have a material adverse effect on our operating results and financial condition. We
also may be required to incur significant costs in an effort to detect and prevent security breaches and other security-related incidents. Confidential
information obtained by third parties in connection with past or future attacks could be used in ways that adversely affect our company or our stockholders.
The majority of our workforce works remotely rather than in our offices, and we may be more susceptible to security breaches and incidents as a result.
Further, we engage third-party service providers to store and otherwise process sensitive and personal information, including our CROs. Our CROs and
other service providers face substantial risks of security breaches and incidents. Our service providers may be more susceptible to security breaches and
other security incidents while social distancing measures restrict the ability of their employees to work at offices to combat the COVID-19 pandemic.
Depending on the nature of any information compromised, in the event of a data breach or other unauthorized access to our sensitive information, we may
also have obligations to notify affected individuals and regulators about the incident, and we may be required or find it appropriate to provide some form of
remedy, such as a subscription to credit monitoring services, pay significant fines to one or more regulators, or pay compensation in connection with a
class-action settlement (including under the new private right of action under the California Consumer Privacy Act of 2018 (the CCPA)). Laws and
regulations relating to cybersecurity and notification and other obligations in connection with security breaches and incidents continue to evolve and may
be inconsistent from one jurisdiction to another. Complying with these obligations and otherwise responding to any security breach or incident could cause
us to incur substantial costs and could increase negative publicity surrounding any incident that compromises, or is perceived to have compromised,
sensitive data.

While our insurance policies include liability coverage for certain of these matters, subject to applicable deductibles, our insurance coverage might not be
adequate for data handling or data security liabilities actually incurred, such insurance may not continue to be available to us in the future on economically
reasonable terms, or at all, and insurers may deny us coverage as to any future claim. The successful assertion of one or more large claims against us that
exceed available insurance coverage, or the occurrence of changes in our insurance policies, including premium increases or the imposition of large
deductible or co-insurance requirements, could have a material adverse effect on our business, including our financial condition, operating results, and
reputation.

79

Business disruptions could seriously harm our future revenue and financial condition and increase our costs and expenses.

Our operations, and those of our CROs and other contractors and consultants, could be subject to earthquakes, power shortages, telecommunications
failures, water shortages, floods, hurricanes, typhoons, fires, extreme weather conditions, medical epidemic, such as the COVID-19 pandemic, and other
natural or man-made disasters or business interruptions, for which we may not have insurance coverage. The occurrence of any of these business
disruptions could seriously harm our operations and financial condition and increase our costs and expenses. In particular, the potential effects on our
business due to the COVID-19 pandemic may be significant and could materially harm our business, operating results and financial condition. We rely on
third-party manufacturers to produce and process momelotinib. Our ability to obtain supplies of momelotinib could be disrupted if the operations of these
suppliers are affected by a man-made or natural disaster or other business interruption. Our corporate headquarters are located in San Mateo, California,
which is near a major earthquake fault. Our operations and financial condition could suffer in the event of a major earthquake or other natural disaster near
any of our locations.

We face risks related to securities litigation that could result in significant legal expenses and settlement or damage awards.

We have in the past and may in the future become subject to claims and litigation alleging violations of the securities laws or other related claims, which
could harm our business and require us to incur significant costs. Any future litigation may require significant attention from management and could result
in significant legal expenses, settlement costs or damage awards that could have a material impact on our financial position, results of operations and cash
flows.

Changes in interpretation or application of generally accepted accounting principles may adversely affect our operating results.

We prepare our financial statements to conform to United States Generally Accepted Accounting Principles. These principles are subject to interpretation
by the Financial Accounting Standards Board, American Institute of Certified Public Accountants, the Public Company Accounting Oversight Board, the
Securities and Exchange Commission and various other regulatory or accounting bodies. A change in interpretations of, or our application of, these
principles can have a significant effect on our reported results and may even affect our reporting of transactions completed before a change is announced.
Additionally, as we are required to adopt new accounting standards, our methods of accounting for certain items may change, which could cause our results
of operations to fluctuate from period to period.

We do not intend to pay dividends on our common stock so any returns will be limited to the value of our stock.

We currently anticipate that we will retain future earnings for the development, operation and expansion of our business and do not anticipate declaring or
paying any cash dividends for the foreseeable future. Any return to stockholders will therefore be limited to the appreciation of their stock.

If securities or industry analysts do not publish research, or publish inaccurate or unfavorable research, about our business, our stock price and
trading volume could decline.

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our business. If
one or more of the securities or industry analysts who publish research about us downgrade our stock or publish inaccurate or unfavorable evaluations of
our company or our stock, the price of our stock could decline. If one or more of these analysts cease coverage of our company, our stock may lose
visibility in the market, which in turn could cause our stock price to decline.

Item 1B. Unresolved Staff Comments.

None.

80

Item  2.

Properties.

Our corporate headquarters are located in San Mateo, California, where we occupy approximately 3,800 square feet of office space under a lease that
expires in approximately March 2025. We believe that this facility is sufficient to meet our current needs.

Item  3.

Legal Proceedings.

From time to time, we may become subject to other legal proceedings, claims and litigation arising in the ordinary course of business. In addition, we may
receive letters alleging infringement of patents or other intellectual property rights. We are not currently a party to any other material legal proceedings, nor
are we aware of any pending or threatened litigation that, in the opinion of our management, would have a material adverse effect on our business,
operating results, cash flows or financial conditions should such litigation be resolved unfavorably. Regardless of outcome, litigation can have an adverse
impact on us because of defense and settlement costs, diversion of management resources and other factors.

Item  4. Mine Safety Disclosures.

Not applicable.

81

 
PART II

Item  5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Our common stock is listed on the Nasdaq Global Market. Our stock trades under the symbol “SRRA”. As of March 8, 2021, there were 56 holders of
record of our common stock. The actual number of stockholders is greater than this number of record holders and includes stockholders who are beneficial
owners but whose shares are held in street name by brokers and other nominees.

 Dividend Policy

We have never declared or paid any cash dividends on our capital stock. We currently intend to retain all available funds and any future earnings to support
our operations and finance the growth and development of our business. We do not intend to pay cash dividends on our common stock for the foreseeable
future.

Recent Sales of Unregistered Securities

None.

Issuer Purchases of Equity Securities by the Issuer and Affiliated Purchasers

None.

Securities Authorized for Issuance under Equity Compensation Plans

The information called for by this item is incorporated by reference to our Proxy Statement for the 2021 Annual Meeting of Stockholders. See Part III,
Item 12 “Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.”

82

Item 6.

Selected Consolidated Financial Data.

The following tables set forth certain selected consolidated financial data. You should read the selected consolidated financial data below in conjunction
with Part II, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our consolidated financial statements
and the related notes included in this Annual Report on Form 10-K. Our historical results are not necessarily indicative of the results that may be expected
in the future.

Consolidated Statements of Operations Data:
Collaboration revenue
Operating expenses (1):

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense), net:

Changes in fair value of warrant liabilities
Other income (expense), net

Total other income (expense), net
Loss before provision for (benefit from) income
   taxes, net
Provision for (benefit from) income taxes, net
Net loss
Net loss per share, basic and diluted (2)
Weighted-average shares used in computing net
   loss per share, basic and diluted (2)

(1)

Includes the following stock-based compensation:

Stock-based compensation:

Research and development
General and administrative

Total stock-based compensation

2020

Year Ended December 31,
2019
2017
2018
(in thousands except share and per share data)

2016

  $

300    $

—    $

—    $

—    $

— 

45,118     
20,123     
65,241     
(64,941)    

(16,240)    
421     
(15,819)    

(80,760)    
142     
(80,902)    

53,249     
13,743     
66,992     
(66,992)    

(20,926)    
(517)    
(21,443)    

(88,435)    
(160)    
(88,275)    

41,078     
14,339     
55,417     
(55,417)    

—     
1,780     
1,780     

30,157     
12,462     
42,619     
(42,619)    

33,895 
14,180 
48,075 
(48,075)

—     
760     
760     

(53,637)    
(302)    
(53,335)    

(41,859)    
156     
(42,015)    

— 
351 
351 

(47,724)
143 
(47,867)

(63.32)

  $

(7.70)   $

(30.30)   $

(30.16)   $

(33.68)   $

    10,506,739     

2,913,487     

1,768,480     

1,247,482     

756,006

2020

2019

Year Ended December 31,
2018
(in thousands)

2017

2016

  $

  $

4,316    $
5,154     
9,470    $

3,873    $
1,822     
5,695    $

4,499    $
2,297     
6,796    $

3,966    $
1,939     
5,905    $

3,635 
1,875 
5,510

(2) Basic and diluted net loss per share is computed based on the weighted-average number of shares of common stock outstanding during each period.
In 2019, basic and diluted net loss per share is computed based on the weighted-average number of common stock and preferred stock with
characteristics of common stock outstanding during the period. 

83

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
      
      
      
  
   
      
      
      
      
  
   
   
   
   
   
      
      
      
      
  
   
   
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
      
      
      
  
   
 
 
Consolidated Balance Sheets Data:
Cash and cash equivalents
Working capital (1)
Total assets
Operating lease liability
Term loan
Total liabilities (1)
Accumulated deficit
Total stockholders’ equity

2020

2019

December 31,
2018
(in thousands)

2017

2016

  $

104,055    $
97,117     
107,487     
175     
—     
9,528     
(846,589)    
97,959     

147,528    $
85,288     
151,328     
374     
—     
64,983     
(765,687)    
86,345     

106,046    $
98,653     
109,469     
—     
4,891     
14,990     
(677,412)    
94,479     

100,348    $
94,253     
102,198     
—     
—     
7,472     
(624,077)    
94,726     

109,007 
102,625 
110,973 
— 
— 
7,725 
(582,054)
103,248

(1) At December 31, 2019, warrant liabilities of $45,935 and a securities issuance obligation of $10,485 were included in current liabilities. See Note 8

and Note 11 to the financial statements under Item 8 of this Form 10-K.

84

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
   
   
   
   
   
   
   
 
 
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion contains management’s discussion and analysis of our financial condition and results of operations and should be read together
with the historical consolidated financial statements and the notes thereto included in Part II, Item 8 “Consolidated Financial Statements and
Supplementary Data.” This discussion and other parts of this Annual Report contain forward-looking statements that reflect our plans, objectives,
expectations, intentions and beliefs and involve numerous risks and uncertainties, including but not limited to those described in the “Risk Factors” section
of this Annual Report. Actual results may differ materially from those contained in any forward-looking statements. You should carefully read “Special
Note Regarding Forward-Looking Statements” and Part I, Item 1A, “Risk Factors.”

Overview

We are a late-stage biopharmaceutical company on a quest to deliver targeted therapies that treat rare forms of cancer. Our main focus is the development
of momelotinib, an investigational agent for the treatment of myelofibrosis. Currently, momelotinib is in a global Phase 3 clinical trial for patients with
myelofibrosis, called the MOMENTUM study, that if successful will be registration enabling. At its completion, approximately 1,000 myelofibrosis
patients will have received momelotinib, and several of our clinical trial patients remain on treatment more than 10 years later.

In the third quarter of 2018, we acquired momelotinib from Gilead Sciences, Inc. (Gilead), which had completed several late-stage trials of the drug
candidate in patients with myelofibrosis. Myelofibrosis is characterized by progressive anemia and thrombocytopenia and currently approved JAK inhibitor
therapies, ruxolitinib and fedratinib, can induce or further exacerbate this myelosuppression, limiting their use in first line treatment and resulting in a
population of second line patients who are no longer able to benefit from such therapies. Momelotinib is a novel, orally-bioavailable JAK1 (Janus kinase
1), JAK2 (Janus kinase 2) and ACVR1 (Activin A receptor type 1) inhibitor with a differentiated mechanism of action, enabling it to potentially address all
three hallmarks of disease in myelofibrosis: anemia of inflammation, constitutional symptoms and enlarged spleen.

In December 2018, we reported new data for momelotinib collated from the two completed SIMPLIFY Phase 3 clinical trials and a translational biology
study in transfusion dependent patients with myelofibrosis. Data from the latter study were also concurrently presented in a poster at the 60th American
Society of Hematology Annual Meeting & Exposition in San Diego, California. We reported aggregated transfusion independence responses from more
than 150 intermediate and high-risk transfusion dependent myelofibrosis patients demonstrating robust and consistent response rates within and across the
clinical studies. More than 44% of these patients became transfusion free for at least 12 weeks and nearly 50% were transfusion independent for at least 8
weeks.

In the second quarter of 2019, we announced that we had obtained regulatory clarity with the U.S. Food and Drug Administration (FDA) concerning the
design of a Phase 3 clinical trial intended to support potential registration of momelotinib. We also announced that the FDA had granted Fast Track
designation to momelotinib for the treatment of patients with intermediate/high-risk myelofibrosis who have previously received a JAK inhibitor.

Following receipt of this clarity, we announced the design of the MOMENTUM Phase 3 clinical trial in myelofibrosis, which we subsequently launched in
the fourth quarter of 2019. MOMENTUM is a randomized double-blind trial designed to enroll 180 myelofibrosis patients who are symptomatic and
anemic and have been treated previously with a JAK inhibitor. The Primary Endpoint of the trial is the Total Symptom Score (TSS) response rate of
momelotinib compared to danazol at Week 24 (99% power; p-value < 0.05). Danazol has been selected as an appropriate treatment comparator given its
use to ameliorate anemia in myelofibrosis patients, as recommended by National Comprehensive Cancer Network (NCCN) and European Society for
Medical Oncology (ESMO) guidelines. Patients are being randomized 2:1 to receive either momelotinib or danazol. After 24 weeks of treatment, patients
on danazol are being allowed to crossover to receive momelotinib.

85

During the fourth quarter of 2019, we reported new analyses of red blood cell (RBC) transfusion data from SIMPLIFY-1, a double-blind Phase 3 trial of
momelotinib head-to-head versus ruxolitinib in JAK inhibitor-naïve patients, which were presented in a poster by Dr. Ruben Mesa, Director of the Mays
Cancer Center, home to UT Health San Antonio MD Anderson Cancer Center, at the 61st American Society of Hematology (ASH) Annual Meeting in
Orlando, Florida. These analyses demonstrated that patients who received momelotinib had significantly decreased transfusion requirements compared to
those treated with ruxolitinib, including an odds ratio of nearly 10 for receiving no transfusions during the 24-week study period. Transfusion dependency
and moderate to severe anemia are critical negative prognostic factors for overall survival in myelofibrosis.

During the second quarter of 2020, at the 25th European Hematology Association (EHA) Virtual Congress, we reported favorable Long-Term Safety and
Dose Intensity data for momelotinib from more than 550 patients across the two previously conducted SIMPLIFY Phase 3 studies and their subsequent
ongoing extended treatment periods. More than 90 SIMPLIFY-1 and SIMPLIFY-2 patients continued to receive momelotinib for 3.5 years or longer. These
data were presented in posters by Professor Claire Harrison, Guy's and St. Thomas' NHS Foundation Trust, London, United Kingdom, and Dr. Vikas Gupta,
Princess Margaret Cancer Centre, Toronto, Canada. The key findings were:

•

•

•

Consistent with prior data, and reflecting momelotinib's differentiated pharmacological profile, our new long-term safety analyses continue to
show a rapid and sustained increase in hemoglobin levels during momelotinib therapy, in contrast to the significant decrease in hemoglobin for
patients receiving ruxolitinib. Patients treated with momelotinib also experienced significantly higher mean platelet counts compared to those
receiving ruxolitinib. Importantly, patients who switched from ruxolitinib to momelotinib also achieved a sustained improvement in
hemoglobin in both studies, and platelets in SIMPLIFY-1. In addition to an absence of significant rates of high-grade hematological toxicities,
long-term tolerability was favorable with no new safety signals or evidence of cumulative toxicity.

Momelotinib's safety profile and durable benefits facilitated sustained dose intensity across the continuum of JAK inhibitor-naïve and
previously JAK inhibitor treated myelofibrosis patients. While the starting doses for ruxolitinib were often attenuated due to low platelets,
further reductions in dose intensity were also commonly required for ruxolitinib. In contrast, momelotinib was initiated at full dose for all
subjects enrolled to the SIMPLIFY studies and high dose intensity was maintained in the majority over extended durations. Patients who
switched from ruxolitinib to momelotinib saw an immediate and sustained improvement in dose intensity.

The data from the two interrelated presentations suggest that the favorable effect on hemoglobin and platelets allows momelotinib to be
initiated at full dose intensity and maintained for the majority of patients at full dose intensity over extended durations while retaining a
favorable long-term safety profile. Notably, some patients continued to receive momelotinib 10 years after enrolling in the initial momelotinib
Phase 2 trials while 90 Phase 3 SIMPLIFY patients who enrolled into those trials 4 to 6 years ago continued to receive momelotinib. We
believe the dosing and safety profile may contribute to momelotinib’s potential ability to provide sustained benefits over extended durations.

Most recently, we released updated analyses from the previously completed Phase 3 SIMPLIFY studies of momelotinib at the American Society of
Hematology Annual Meeting in December 2020, including overall survival data as well as efficacy data for momelotinib compared to ruxolitinib in patients
with low platelet levels. The overall survival data received an oral presentation by Dr. Srdan Verstovsek of the University of Texas MD Anderson Cancer
Center in Houston, Texas, USA; efficacy data by platelet strata were presented in a poster by Dr. Jean-Jacques Kiladjian, Saint Louis Hospital, Paris,
France. Key findings were:

•

Robust overall survival was observed in both JAK inhibitor-naïve and previously ruxolitinib treated patients. Sustained transfusion
independence was observed with extended momelotinib treatment, and the median duration of TI in the momelotinib arm has not been reached
after more than three years of follow up. We believe these data, in combination with previously reported safety data, further highlight where
momelotinib may be a viable treatment option for myelofibrosis patients including those who are not ideal candidates for currently approved
therapies.

86

 
 
 
 
•

The retrospective analysis of the two Phase 3 SIMPLIFY studies demonstrate that the relative benefit-risk profile of momelotinib and
ruxolitinib is influenced by baseline platelet count. In SIMPLIFY-1, momelotinib achieved substantially higher Transfusion Independence (TI)
and splenic response rates and had a similar symptomatic response relative to ruxolitinib in patients whose baseline platelet count was <150 x
109L. For patients whose platelet count was 150 – 300 x 109/L, momelotinib achieved a higher TI response rate and generally similar splenic
and symptom response rates. In patients with platelet counts >300 x 109/L, ruxolitinib achieved higher splenic and symptom response rates
than momelotinib, and the TI rate remained higher with momelotinib. These updated analyses complement previous findings that demonstrate
the ability to initiate and maintain near-maximal momelotinib dose intensity regardless of baseline platelet count, suggesting that this durable
dosing contributes to its efficacy profile.

During 2020, we continued to operationalize the MOMENTUM trial on a global basis, and we anticipate closing screening in the first half of 2021 and
remain on track to complete enrollment in mid-2021. Top-line data are currently anticipated in the first half of 2022 and we anticipate filing for regulatory
approval of momelotinib in the second half of 2022. Due to the recent global outbreak of COVID-19, our clinical trials have been and may continue to be
affected, and we are likely to experience delays in anticipated timelines and milestones, which will be difficult to predict until we have more visibility on
the duration and impact of the COVID-19 pandemic and the potential institution of additional public health orders. We have experienced and may continue
to experience some delays in planned site initiations and activations and may experience future delays in overall enrollment.

We believe that our current resources will be sufficient to execute on our development strategy for momelotinib into the second half of 2022, subject to the
potential impact of COVID-19. We are also starting to explore non-dilutive options that could provide additional capital to support our North American
commercialization strategy.

Our portfolio also includes SRA737, a selective, orally bioavailable small molecule inhibitor of Checkpoint kinase 1 (Chk1), an emerging target for the
treatment of cancer which has a key role in the DNA Damage Response (DDR). In November 2020, we entered into an amendment to the License
Agreement with CRT Pioneer Fund (CPF) to allow for the potential future clinical development of SRA737.

We wholly own momelotinib, subject to future milestone payments and royalties, and retain the global commercialization rights to SRA737.

Since inception, we have devoted substantially all of our resources to research and development activities, including the clinical development of
momelotinib and SRA737 as well as SRA141 and PNT2258, our former product candidates, and to provide general and administrative support for our
operations. We have never generated product revenue and have incurred significant net losses since inception. Our net losses were $80.9 million, $88.3
million and $53.3 million for the year ended December 31, 2020, 2019 and 2018, respectively. As of December 31, 2020, we had an accumulated deficit of
$846.6 million, of which approximately $428.0 million pertained to the revaluation and conversion of redeemable convertible preferred stock upon our
initial public offering in July 2015, $37.2 million related to changes in fair value of our Series A and Series B warrant liabilities until their reclassification
to equity in the first quarter of 2020, and $12.0 million pertained to a securities issuance obligation settled during the first quarter of 2020.

The extent of the impact of COVID-19 on our operational and financial performance will depend on certain developments, including the duration and
spread of the outbreak, impact on our clinical studies, employee or industry events, and effect on our suppliers and manufacturers, all of which are
uncertain and cannot be predicted. The COVID-19 pandemic and its adverse effects have become more prevalent in the locations where we, our CROs,
suppliers or third-party business partners conduct business and as a result, we have begun to experience more pronounced disruptions in our operations. We
may experience constrained supply of momelotinib or comparator drug required for our ongoing Phase 3 trial, or, with respect to our clinical trials, delays
in enrollment, site initiation, participant dosing, distribution of clinical trial materials, study monitoring and data analysis that could materially adversely
impact our business, results of operations and overall financial performance in future periods. Specifically, we may experience impact from changes in how
we and companies worldwide conduct business due to the COVID-19 pandemic, including but not limited to restrictions on travel and in-person meetings,
prioritization of hospital resources toward pandemic effort, delays in review by the FDA and comparable foreign regulatory agencies, and disruptions in
our supply chain for momelotinib. Any such delays to our planned MOMENTUM timeline could also

87

 
impact the use and sufficiency of our existing cash reserves, and we may be required to raise additional capital earlier than we had previously planned. We
may be unable to raise additional capital if and when needed, which may result in further delays or suspension of our development plans. As of the filing
date of this Annual Report on Form 10-K, the extent to which COVID-19 may impact our financial condition, results of operations or guidance is
uncertain. The effect of the COVID-19 pandemic will not be fully reflected in our results of operations and overall financial performance until future
periods. See the section entitled “Risk Factors” included elsewhere in this report for further discussion of the possible impact of the COVID-19 pandemic
on our business.

We have funded our operations to date primarily from the issuance and sale of our common stock and convertible voting preferred stock and accompanying
warrants through public offerings (including At-The-Market (ATM) equity offerings), and our convertible and redeemable convertible preferred stock in
private financings and, to a lesser extent, through exercises of our preferred stock warrants in private financings. As of December 31, 2020, we had cash
and cash equivalents of $104.1 million.

Components of Statements of Operations

Collaboration Revenue

Collaboration revenue consists of upfront license fees recognized under a collaboration agreement with Carna Biosciences, Inc.

Operating Expenses

Research and Development

Research and development expenses consist primarily of the following:

•

•

•

•

•

fees, milestone payments or other expenses incurred in connection with license and asset purchase agreements and their related amendments;

personnel-related costs, which include salaries, benefits, stock-based compensation, recruitment fees and travel costs;

costs associated with research and preclinical studies, clinical trials, regulatory activities and manufacturing activities to support clinical
activities;

fees paid to external service providers that conduct certain research and development, clinical and manufacturing activities on our behalf; and

facility-related costs, which include direct and allocated expenses for rent and maintenance of facilities, depreciation and amortization expenses
and other supplies.

The largest recurring component of our total operating expenses has historically been our investment in research and development activities, including the
development of momelotinib. We expect our research and development expenses will increase over the next few years as we advance momelotinib,
potentially including combination studies as the field of myelofibrosis evolves, achieve regulatory milestones that trigger payments due under our Asset
Purchase Agreement with Gilead, pursue regulatory approval of momelotinib in the United States and other jurisdictions, expand our portfolio of product
candidates and prepare for potential commercialization, which will require a significant investment in areas related to contract manufacturing and inventory
buildup.

The process of conducting clinical trials necessary to obtain regulatory approval is costly and time consuming. We may never succeed in achieving
marketing approval for our lead product candidate, momelotinib. The probability of success of our product candidates may be affected by numerous
factors, including clinical data, regulatory developments, competition, manufacturing capability and commercial viability. As a result, we are unable to
determine the duration and completion costs of our research and development projects or when and to what extent we will generate revenue from the
commercialization of momelotinib.

88

 
 
 
 
 
General and Administrative

General and administrative expenses consist of personnel-related costs, facility-related costs, business insurance, allocated expenses and professional fees
for services, including legal, pre-commercialization activities, patent prosecution and maintenance, human resources, audit and accounting services.
Personnel-related costs consist of salaries, benefits, stock-based compensation, recruitment fees, severance costs and travel costs.

We expect to incur additional expenses associated with supporting our growing research and development activities, preparing for potential
commercialization, continuing to operate as a public company and other administration and professional services.

Other Income (Expense), net

Changes in Fair Value of Warrant Liabilities

Our common stock warrants issued in connection with our November 2019 financing were classified as liabilities on our consolidated balance sheets and,
as such, were re-measured to fair value until January 2020, when they were no longer considered derivative instruments. Changes in fair value, which were
directly attributable to changes in the fair value of the underlying stock and discount for lack of marketability, were recorded as an expense in the
consolidated statement of operations.

Other Income (Expense), net

Other income (expense), net primarily consists of interest earned on our cash and cash equivalents and foreign currency exchange gains and losses related
to transactions and monetary asset and liability balances denominated in currencies other than the U.S. dollar. Foreign currency exchange gains and losses
may fluctuate in the future due to changes in foreign currency exchange rates. In 2019, other income (expense), net also included interest expense
associated with our term loan, including final payment and prepayment fees and the full non-cash amortization of debt issuance costs, until its repayment
and offering expenses incurred pertaining to the issuance of warrants.

Provision for (Benefit from) Income Taxes, net

Provision for (benefit from) income taxes, net consists of federal and state income taxes in the United States, income tax benefit resulting from research and
development tax credits in Canada, income taxes in Canada and Australia, as well as deferred income taxes reflecting the net tax effects of temporary
differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes, and
changes in related valuation allowance.

We did not record a provision for U.S. federal income taxes for the year ended December 31, 2020. Our income tax provision relates to income taxes in
Canada and Australia and our tax benefit relates to research and development tax credits in Canada. Our net U.S. deferred tax assets continue to be offset
by a full valuation allowance.

Results of Operations

A discussion regarding our financial condition and results of operations for the year ended December 31, 2019 compared to the year ended December 31,
2018 is included in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our Annual
Report on Form 10-K for the year ended December 31, 2019, filed with the SEC on March 3, 2020.

89

Year Ended December 31, 2020 Compared to Year Ended December 31, 2019

Year Ended
December 31,

Collaboration revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense), net:

Changes in fair value of warrant liabilities
Other income (expense), net

Total other income (expense), net
Loss before provision for (benefit from) income
   taxes, net
Provision for (benefit from) income taxes, net
Net loss

2020

  $

2019
(in thousands, except percentages)
300    $

—    $

%

300     

100%

Change
$

45,118     
20,123     
65,241     
(64,941)    

(16,240)    
421     
(15,819)    

53,249     
13,743     
66,992     
(66,992)    

(20,926)    
(517)    
(21,443)    

(80,760)    
142     
(80,902)   $

(88,435)    
(160)    
(88,275)   $

  $

(8,131)    
6,380     
(1,751)    
2,051     

4,686     
938     
5,624     

7,675     
302     
7,373     

(15%)
46%
(3%)
(3%)

(22%)
(181%)
(26%)

(9%)
(189%)
(8%)

Collaboration Revenue

Collaboration revenue of $0.3 million was recognized during the year ended December 31, 2020 pursuant to the upfront fee received from a collaboration
agreement (see Note 8 in the Notes to Consolidated Financial Statements).

Research and Development

Research and development expenses decreased $8.1 million, from $53.2 million in 2019 to $45.1 million in 2020. The decrease was primarily due to a non-
cash charge of $10.5 million that was recognized during the year ended December 31, 2019, pertaining to an obligation to issue common stock and a
warrant to Gilead in consideration for meaningfully reduced royalty rates and elimination of a milestone payment, partially offset by a $1.5 million non-
cash charge during the year ended December 31, 2020 to recognize the change in fair value of the securities until their issuance in January 2020. Also
contributing to the decrease was a reduction of $7.6 million in clinical trial, third-party manufacturing, and research and preclinical costs for SRA737 and a
$0.9 million decrease in personnel-related and allocated overhead costs for the year ended December 31, 2020. These decreased costs were offset by a
$9.4 million increase in clinical trial and development costs related to momelotinib for the year ended December 31, 2020.

General and Administrative

General and administrative expenses increased $6.4 million, from $13.7 million in 2019 to $20.1 million in 2020. The increase was attributable to a $4.9
million increase in personnel-related and allocated overhead costs, including a $3.4 million increase in non-cash stock-based compensation and $1.0
million of severance charges that were primarily related to the resignation of an executive, and an increase of $1.5 million in professional fees primarily
relating to pre-commercial costs for momelotinib for the year ended December 31, 2020.

Changes in Fair Value of Warrant Liabilities

The changes in the fair value of our warrant liabilities were directly attributable to the change in the fair value of the underlying stock and discount for lack
of marketability until such time the warrants were no longer considered derivative instruments.

90

 
 
 
 
   
   
 
 
 
 
 
   
   
   
 
 
 
   
 
 
 
   
      
      
      
  
   
   
   
   
   
      
      
      
  
   
   
   
   
   
 
Other Income (Expense), net

Other income (expense), net increased $0.9 million, from $0.5 million of other expense, net in 2019 to $0.4 million of other income, net in 2020. The
change was primarily attributable to offering expenses pertaining to the issuance of warrants of $1.3 million and interest expense incurred on the term loan
of $0.9 million incurred during the year ended December 31, 2019. These charges were not incurred in 2020. This change was offset by a $1.2 million
decrease in interest income, due to a lower interest rates, and a $0.1 million increase in foreign exchange loss for the year ended December 31, 2020.

Provision for (Benefit from) Income Taxes, net

Net provision for income taxes of $0.1 million in 2020 and net benefit from income taxes of $0.2 million in 2019 represented foreign income taxes.

Liquidity and Capital Resources

Capital Resources

Since our inception, we have never generated product revenue and have incurred significant net losses. We have funded our operations to date primarily
from the issuance and sale of our common stock and convertible voting preferred stock and accompanying warrants through public offerings (including
ATM equity offerings), our convertible and redeemable convertible preferred stock in private financings and, to a lesser extent, through exercises of our
preferred stock warrants issued in private financings. Our net losses for the year ended December 31, 2020 and 2019 were $80.9 million and $88.3 million,
respectively. As of December 31, 2020, we had an accumulated deficit of $846.6 million, of which approximately $428.0 million pertained to the
revaluation and conversion of redeemable convertible preferred stock upon our initial public offering in July 2015, $37.2 million related to changes in fair
value of our Series A and Series B warrant liabilities until their reclassification to equity, and $12.0 million pertained to a securities issuance obligation
settled in the first quarter of 2020. Our principal sources of liquidity as of December 31, 2020 were cash and cash equivalents of $104.1 million.

In November 2019, we completed an underwritten public offering of an aggregate of (i) 103,000 shares of Series A Preferred Stock, that all converted into
7,803,273 shares of common stock in January 2020, (ii) Series A warrants to purchase up to an aggregate of 7,802,241 shares of our common stock at an
exercise price equal to $13.20, and (iii) Series B warrants to purchase up to an aggregate of 2,574,727 shares of common stock at an exercise price equal to
$13.20. Each share of Series A Preferred Stock and the accompanying Series A and Series B warrants were issued at a combined price to the public of
$1,000. The aggregate net proceeds received by us from the offering were $97.7 million, net of underwriting discounts and commissions and offering
expenses. The Series A warrants contain a cash and/or cashless exercise provision and the Series B warrants may only be exercised by paying the exercise
price in cash.

In August 2020, we entered into an open market sales agreement, pursuant to which we can issue and sell an aggregate of up to $20.0 million of our
common stock from time to time in ATM offerings. During the year ended December 31, 2020, we sold 732,752 shares under the ATM program for
proceeds of $8.9 million, net of commissions and offering expenses. In January 2021, we sold an additional 450,000 shares under the ATM program for
proceeds of $7.1 million, net of commissions. In addition, in February 2021, we filed a prospectus supplement pursuant to which we can issue and sell an
aggregate of up to $30.0 million of our common stock from time to time in ATM offerings.

We expect to incur significant expenses and increasing operating losses for the foreseeable future. We anticipate that our expenses will increase
substantially as we:

•

•

invest to further develop momelotinib, potentially including combination studies as the field of myelofibrosis evolves;

hire additional clinical, regulatory, scientific, drug development and management personnel, as well as personnel to support any future
commercialization efforts;

91

 
 
•

•

•

•

•

•

•

•

•

invest in scaling our manufacturing capacity to support development and our global commercialization strategy;

seek regulatory and marketing approvals for any product candidates that we may develop;

achieve regulatory milestones that trigger payments due under our Asset Purchase Agreement with Gilead;

ultimately establish a sales, marketing and distribution infrastructure to commercialize any drugs for which we may obtain marketing approval;

acquire or in-license additional product candidates and technologies;

develop additional product candidates;

defend against potential lawsuits or other legal issues;

maintain, expand and protect our intellectual property portfolio; and

add operational, financial and management information systems and personnel related to commercialization and to continue to operate as a
public company.

To fund our operating plans, we will need to raise additional capital. Our existing cash and cash equivalents will not be sufficient for us to complete
development and prepare for commercializing momelotinib. Accordingly, we will continue to require substantial additional capital to continue our clinical
development and potential commercialization activities; however, we believe that our existing cash and cash equivalents will be sufficient to fund our
current operating plans into the second half of 2022, subject to the potential impact of COVID-19. In addition, Series B warrants, if fully exercised, would
provide approximately $34.0 million in proceeds to us. We cannot assure you that the Series B warrants will be exercised, or that we will ever be profitable
or generate positive cash flow from operating activities. However, our forecast for the period of time through which our financial resources will be
adequate to support our operations is a forward-looking statement that involves risks and uncertainties, and actual results could vary materially. The amount
and timing of our future funding requirements will depend on many factors, including the pace and results of our preclinical and clinical development
efforts, including any potential impacts of the COVID-19 pandemic on our clinical development efforts, costs related to momelotinib commercialization
efforts, costs related to potentially develop momelotinib in combination studies or costs to develop additional product candidates.

We plan to continue to fund our operating plans’ needs through equity financings or other arrangements, such as strategic partnerships and alliances or
licensing arrangements. To the extent that we raise additional capital through future equity financings, the ownership interest of our stockholders will be
diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our existing common stockholders.
If we raise additional funds through the issuance of debt securities, these securities could contain covenants that would restrict our operations. If we raise
additional funds through strategic partnerships and alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our
technologies or momelotinib or grant licenses on terms unfavorable to us. There can be no assurance that such additional financing, if available, can be
obtained on terms acceptable to us. If we are unable to obtain such additional financing, we would need to reevaluate our future operating plans. We are
exploring options to support the potential continued development of SRA737 in the future. There can be no assurance that we will successfully obtain the
funding or support necessary to advance SRA737 or obtain such funding or support on commercially reasonable terms.

92

 
 
 
 
 
 
 
 
 
Cash Flows

The following table summarizes our cash flows for the periods indicated:

Cash used in operating activities
Cash used in investing activities
Cash provided by financing activities
Effect of foreign exchange rate changes on cash, cash
   equivalents and restricted cash

Net increase (decrease) in cash, cash equivalents
   and restricted cash

Year Ended
December 31,

2020

2019

(in thousands)

  $

(52,367)   $
(12)    
8,901     

(51,183)
(39)
92,738 

5     

(34)

  $

(43,473)   $

41,482

Cash Flows from Operating Activities

In 2020, cash used in operating activities of $52.4 million was attributable to a net loss of $80.9 million, partially offset by $27.7 million in non-cash and
other adjustments and a net change of $0.8 million in our net operating assets and liabilities. The non-cash charges consisted primarily of a $16.2 million
change in fair value of our warrant liabilities, a $1.5 million non-cash charge relating to the securities issuable to Gilead in connection with the amendment
to the Asset Purchase Agreement, and $9.5 million of non-cash stock-based compensation. The change in net operating assets and liabilities was primarily
attributable to an increase in our accounts payable of $1.2 million, partially offset by a decrease in our accrued, other and operating lease liabilities of $0.4
million.

In 2019, cash used in operating activities of $51.2 million was attributable to a net loss of $88.3 million and a net change of $2.0 million in our net
operating assets and liabilities, partially offset by $39.1 million in non-cash and other adjustments. The non-cash and other adjustments consisted primarily
of a $20.9 million change in fair value of our warrant liabilities, a $10.5 million non-cash expense relating to the securities issuable to Gilead in connection
with the amendment to the Asset Purchase Agreement, $5.7 million of non-cash stock-based compensation, and a $1.7 million reclassification of cash
flows, pertaining to the issuance of warrants and repayment of debt, to financing activities. The change in net operating assets and liabilities was primarily
attributable to a decrease in our accrued and other liabilities and operating lease liabilities.

Cash Flows from Investing Activities

Cash used in investing activities for each of December 31, 2020 and 2019 was primarily attributable to the purchase of property and equipment.

Cash Flows from Financing Activities

In 2020, cash provided by financing activities of $8.9 million consisted of net proceeds (gross proceeds of $9.3 million) from the sale of 732,752 shares
under the ATM program.

In 2019, cash provided by financing activities was $92.7 million, attributable to net proceeds of $97.7 million received from our November 2019 financing
and $0.4 million of proceeds received from the exercise of options to purchase common stock, partially offset by a $5.4 million payment to settle our term
loan and related repayment obligations.

93

 
 
 
 
 
 
   
 
 
 
 
   
   
   
 
 
Contractual Obligations and Other Commitments

The following table summarizes our contractual obligations as of December 31, 2020, which represent material expected or contractually committed future
obligations.

Purchase commitments(1)
Operating lease obligations(2)

Total contractual obligations

Total

Less Than
1 Year

Payments Due By Period

1 to 3 Years
(in thousands)

3 to 5 Years

More Than
5 Years

  $

  $

22,267    $
1,203     
23,470    $

12,979    $
296     
13,275    $

9,262    $
849     
10,111    $

26    $
58     
84    $

— 
— 
—

(1) Reflects payments we are required to make pursuant to clinical trial and manufacturing agreements.

(2) Reflects payments we are required to make under operating lease agreements. Minimum lease payments have not been reduced by base rent of $0.4
million due in the future under sublease agreement. Taxes and other operating costs payable to the landlord and recoverable from the subtenant are
not included in the amounts disclosed. (See Note 6 to the financial statements under Item 8 of this Form 10-K.)

Under the terms of the agreements with Gilead and CRT Pioneer Fund LP (CPF), we will be required to pay future milestones if certain developmental,
regulatory and commercial milestones are achieved. Future milestones for which we cannot reliably estimate the timing have been excluded from the table
above.

Critical Accounting Policies and Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which
have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP). The preparation of these consolidated financial
statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets
and liabilities at the date of the consolidated financial statements, as well as the reported expenses incurred during the reporting periods. Our estimates are
based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis
for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these
estimates under different assumptions or conditions. We believe that the accounting policies discussed below are critical to understanding our historical and
future performance, as these policies relate to the more significant areas involving management’s judgments and estimates.

Research and Development Expenses

As part of the process of preparing financial statements, we are required to estimate and accrue expenses, a significant portion of which are research and
development expenses. Costs for certain research and development activities are recognized based on an evaluation of the progress to completion of
specific tasks using information and data provided to us by our vendors and our clinical sites. This process involves the following:

•

•

•

reviewing quotations and contracts, identifying services that have been performed on our behalf and estimating the level of service performed
and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of actual cost;

estimating and accruing expenses in our financial statements as of each balance sheet date based on facts and circumstances known to us at the
time; and

periodically confirming the accuracy of our estimates with selected service providers and making adjustments, if necessary.

94

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
Estimated research and development expenses that we accrue include clinical trial costs under arrangements with third parties, such as contract research
organizations (CROs), manufacturing costs under agreements with contract manufacturing organizations (CMOs), external research and development
expenses incurred under arrangement with third parties and consultants, and license fees for technology that has not reached technological feasibility and
does not have an alternative future use.

We base our expense accruals related to clinical trials on patient enrollment and our estimates of the services received and efforts expended pursuant to
contracts with multiple research institutions that conduct and manage clinical trials on our behalf. The financial terms of these agreements vary for each
contract and may result in uneven payment flows. Payments under some of these contracts depend on several factors, such as the successful enrollment of
patients and the completion of clinical trial milestones. In accruing service fees, we estimate the time period over which services will be performed and the
level of effort to be expended in each period. If we do not identify costs that we have begun to incur or if we underestimate or overestimate the level of
services performed or the costs of these services, our actual expenses could differ from our estimates. For service contracts entered into that include a
nonrefundable prepayment for service, the upfront payment is deferred and recognized in the statement of operations as the services are rendered.

Contingent milestone payment obligations due to third parties under license and asset purchase agreements are expensed when the milestones are
considered probable of occurring. To the extent that an obligation is to be settled by future issuance of securities, the fair value of the instruments is
recorded in research and development expense until the securities are issued.

To date, we have not experienced significant changes in our estimates of accrued research and development expenses after a reporting period. However,
due to the nature of estimates, we cannot assure you that we will not make changes to our estimates in the future as we become aware of additional
information about the status or conduct of our clinical trials and other research activities.

Stock-Based Compensation

Stock-based compensation costs related to stock options granted to employees are measured at the date of grant based on the estimated fair value of the
award. We estimate the grant date fair value, and the resulting stock-based compensation expense, using the Black-Scholes option-pricing model. For
stock-based awards that vest subject to the satisfaction of a service requirement, the grant date fair value of the awards is recognized on a straight-line basis
over the requisite service period, which is generally the vesting period of the respective awards. For stock-based awards subject to the satisfaction of a
service requirement and performance component, the fair value of the award, which is measured on the date of grant, is recognized over the requisite
service period as achievement of the performance objective becomes probable. The fair value of any options issued to non-employees is recorded as
expense over the vesting period, which is generally the service period.

The Black-Scholes option-pricing model requires the use of highly subjective assumptions which determine the estimated fair value of stock-based awards.
These assumptions include:

Expected Term—The expected term represents the period that stock-based awards are expected to be outstanding. As our historical share option
exercise is limited due to a lack of sufficient data points, and does not provide a reasonable basis upon which to estimate an expected term, we
estimate the expected term by using the midpoint between the weighted-average vesting term and the contractual expiration period of the stock-
based award.

Expected Volatility—The expected volatility is derived from a weighted volatility using both the trading history for our common stock and the
historical stock volatilities of peer public companies within our industry that are considered to be comparable to our business over a period
equivalent to the expected term of the stock-based awards.  

Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant for zero-coupon U.S.
Treasury notes with maturities approximately equal to the stock-based awards’ expected term.

95

Expected Dividend Rate—The expected dividend is zero as we have not paid nor anticipate paying any dividends on our common stock in the
foreseeable future.

Forfeiture Rate—We account for forfeitures when they occur.

We will continue to use judgment in evaluating the expected volatility and expected terms utilized for our stock-based compensation calculations on a
prospective basis.

Warrant Liabilities

Warrants for the purchase of shares of our common stock issued in connection with our November 2019 financing were classified as derivative liabilities
on our consolidated balance sheets at their fair value on the date of issuance. At the end of each reporting period, changes in estimated fair value during the
period were recognized as a component of other income (expense), net in our consolidated statement of operations. We revalued the warrant liabilities until
they ceased to be derivative instruments, at which time they were reclassified to additional paid-in capital at their fair value.

We estimated the fair value of these liabilities using assumptions that were based on the individual characteristics of the warrants on the valuation dates. We
used the Black-Scholes option-pricing model and the fair value of the underlying stock to determine the fair value of these liabilities. The valuation model
was based on inputs as of the valuation dates, including the estimated volatility of our stock, the remaining contractual term of the warrants and the risk-
free interest rates. An estimated non-marketable discount was also applied if applicable.

Securities Issuance Obligation

The obligation to issue shares of our common stock and a warrant to purchase the same number of shares of common stock pursuant to the amendment to
the Asset Purchase Agreement with Gilead was classified as a liability on our consolidated balance sheet at their fair values on the date such obligations
arose. At the end of each reporting period, changes in estimated fair values during the period were recognized as research and development expense on our
consolidated statement of operations. We adjusted the fair values of the obligations until the securities issuance obligation was settled, at which time the
liabilities were reclassified to common stock and additional paid-in capital at their fair values.

We estimated the fair values of these obligations using assumptions that were based on the individual characteristics of the securities to be issued. We used
the fair value of the underlying stock and estimated non-marketable discount to determine the common stock issuance obligation, and the Black-Scholes
option-pricing model and the fair value of the underlying stock to determine the fair value of the warrant issuance obligation. The valuation model was
based on inputs as of the valuation dates, including the estimated volatility of our stock, the remaining contractual term of the warrants and the risk-free
interest rates. An estimated non-marketable discount was also applied if applicable.

Off-Balance Sheet Arrangements

As of December 31, 2020, we did not have any off-balance sheet financing arrangements or any interest in entities referred to as variable interest entities,
which includes special purpose entities and other structured finance entities.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

We are exposed to market risks in the ordinary course of our business. These risks primarily include interest rate sensitivities and foreign currency risk.

96

Interest Rate Sensitivity

We had cash and cash equivalents of $104.1 million as of December 31, 2020, which consisted primarily of bank deposits and money market funds. Our
primary exposure to market risk is interest income sensitivity, which is affected by changes in the general level of U.S. interest rates. While the instruments
in our portfolio are of short-term nature and a sudden change in market interest rates would not be expected to have a material impact, a zero-rate
environment for an extended period of time could adversely affect our results of operations. We do not believe that our cash or cash equivalents have
significant risk of default or illiquidity.

Foreign Currency Risk

Our consolidated results of operations and cash flows are subject to fluctuations due to changes in foreign currency exchange rates. A substantial majority
of our expenses are denominated in U.S. Dollars, with the remainder in Canadian Dollars, British Pounds and Australian Dollars. Our consolidated results
of operations and cash flow are, therefore, subject to fluctuations due to changes in foreign currency exchange rates and may be adversely affected in the
future due to changes in foreign exchange rates. To date, we have not entered into any hedging arrangements with respect to foreign currency risk or other
derivative instruments. The effect of a hypothetical 10% change in foreign currency exchanges rates applicable to our business would not have a material
impact on our operating loss.

Item 8.

Consolidated Financial Statements and Supplementary Data.

97

 
 
 
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

SIERRA ONCOLOGY, INC.
Report of Independent Registered Public Accounting Firm
Consolidated Balance Sheets
Consolidated Statements of Operations and Comprehensive Loss
Consolidated Statements of Stockholders’ Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements

98

Page

99
101
102
103
104
105

 
 
 
 
 
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Shareholders of
Sierra Oncology, Inc.:
San Mateo, California

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Sierra Oncology Inc. and subsidiaries (the "Company") as of December 31, 2020 and
2019, the related consolidated statements of operations and comprehensive loss, shareholders' equity, and cash flows, for each of the three years in the
period ended December 31, 2020, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements
present fairly, in all material respects, the financial position of the Company as of December 31, 2020 and 2019, and the results of its operations and its
cash flows for each of the three years in the period ended December 31, 2020, in conformity with accounting principles generally accepted in the United
States of America.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial
statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States)
(PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and
regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor
were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits, we are required to obtain an understanding of
internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over
financial reporting. Accordingly, we express no such opinion.

Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and
performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in
the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as
evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Accounting Matter

The critical audit matter communicated below is a matter arising from the current-period audit of the financial statements that was communicated or
required to be communicated to the audit committee and that (1) relates to accounts or disclosures that are material to the financial statements and (2)
involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion
on the financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical
audit matter or on the accounts or disclosures to which it relates.

Accrued Liabilities and Prepaid Expenses – Management’s Estimates of Accrued and Prepaid Research and Development Costs Associated with Clinical
Trials - Refer to Notes 2 and 5 to the Financial Statements

Critical Accounting Matter Description

The Company recognizes research and development costs for clinical trials based on an evaluation of the progress to completion of specific tasks using
information and data provided by contract research organizations (CROs) and other third parties. Depending on the timing of payments to providers of
research and development services, the Company recognizes prepaid expenses or accrued expenses related to these costs. These prepaid or accrued
expenses are based on management’s estimates of the work performed under service agreements and milestones achieved.

99

We identified accrued and prepaid research and development costs related to clinical trials as a critical audit matter because of the judgments necessary for
management to estimate the level of service performed and the associated cost incurred for the service when the Company has not yet been invoiced or
otherwise notified of actual cost. The volume and complexity of the service agreements required a high degree of auditor judgment and an increased extent
of effort when performing audit procedures to audit management’s estimates of services performed and costs incurred and evaluating the results of those
procedures.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to clinical trial accrued and prepaid expenses include the following, among others:

•

•

We evaluated publicly available information (such as press releases and investor presentations) and board of directors’ materials regarding the
status of clinical trial activities.
We made selections of specific amounts recognized as research and development expense as well as those recognized as accrued and prepaid
expenses to evaluate management’s estimates of the services performed and costs incurred and performed the following procedures:

•

•
•

Obtained and read the related service agreements, amendments thereto, purchase orders, invoices, or other supporting
documentation (such as communications between the Company and CROs).
Performed corroborating inquiries with Company management and clinical operations personnel.
Evaluated management’s judgments compared to the evidence obtained.

/s/ Deloitte & Touche LLP

Grand Rapids, Michigan
March 11, 2021

We have served as the Company's auditor since 2014.

100

 
 
 
 
 
SIERRA ONCOLOGY, INC.

Consolidated Balance Sheets
(in thousands, except share and per share data)

ASSETS
CURRENT ASSETS:

Cash and cash equivalents
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Operating lease right-of-use asset
Other assets
TOTAL ASSETS

LIABILITIES AND STOCKHOLDERS’ EQUITY
CURRENT LIABILITIES:

Accrued and other liabilities
Accounts payable
Warrant liabilities
Securities issuance obligation
Total current liabilities

Operating lease liability
TOTAL LIABILITIES
Commitments and Contingencies (Note 8)
STOCKHOLDERS’ EQUITY:
Preferred stock, $0.001 par value; 10,000,000 shares authorized as of
   December 31, 2020 and December 31, 2019; nil shares issued and
   outstanding as of December 31, 2020 and 103,000 shares of Series
   A convertible voting preferred stock issued and outstanding as
   of December 31, 2019
Common stock, $0.001 par value; 500,000,000 shares authorized as of
   December 31, 2020 and December 31, 2019; 11,128,484 and 1,867,176
   shares issued and outstanding as of December 31, 2020 and 2019
Additional paid-in capital
Accumulated deficit
TOTAL STOCKHOLDERS’ EQUITY
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY

December 31,
2020

December 31,
2019

  $

  $

  $

104,055    $
2,415   
106,470   
52   
318   
647   
107,487    $

7,148    $
2,205   
—   
—   
9,353   
175   
9,528   

147,528 
2,369 
149,897 
113 
589 
729 
151,328 

7,170 
1,019 
45,935 
10,485 
64,609 
374 
64,983 

—   

1 

11   
944,537   
(846,589)  
97,959   
107,487    $

74 
851,957 
(765,687)
86,345 
151,328

  $

The accompanying notes are an integral part of these consolidated financial statements.

101

 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SIERRA ONCOLOGY, INC.

Consolidated Statements of Operations and Comprehensive Loss
(in thousands, except share and per share data)

Collaboration revenue
Operating expenses:

Research and development
General and administrative
Total operating expenses

Loss from operations
Other income (expense), net:

Changes in fair value of warrant liabilities
Other income (expense), net

Total other income (expense), net

Loss before provision for (benefit from) income taxes, net
Provision for (benefit from) income taxes, net
Net loss and comprehensive loss

Net loss per common share, basic and diluted

Weighted-average shares used in computing net loss per
   common share, basic and diluted

2020

Year Ended December 31,
2019

2018

  $

300    $

—    $

— 

45,118 
20,123   
65,241   
(64,941)  

(16,240)  
421   
(15,819)  
(80,760)  
142   
(80,902)   $

(7.70)   $

53,249 
13,743   
66,992   
(66,992)  

(20,926)  
(517)  
(21,443)  
(88,435)  
(160)  
(88,275)   $

(30.30)   $

41,078 
14,339 
55,417 
(55,417)

— 
1,780 
1,780 
(53,637)
(302)
(53,335)

(30.16)

10,506,739   

2,913,487   

1,768,480

  $

  $

The accompanying notes are an integral part of these consolidated financial statements.

102

 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SIERRA ONCOLOGY, INC.
Consolidated Statements of Stockholders’ Equity
(in thousands, except share data)

Balance—December 31, 2017

—    $

—     

Series A Convertible
Voting Preferred Stock
Shares

Amount

Common Stock

Shares
1,309,856    $

Amount

—     
—     

—     
—     

3,014     
—     

180     
6,796     

—     
—     

Additional
Paid-In
Capital

  Accumulated  
Deficit
(624,077)   $

718,751    $

Total
Stockholders’  
Equity

94,726 

180 
6,796 

52    $

—     
—     

Issuance of common stock for
   exercise of stock options
Stock-based compensation
Issuance of common stock, net of
   offering costs of $3.2 million
Issuance of common stock
   warrant
Net loss

Balance—December 31, 2018

Issuance of common stock for
   exercise of stock options
Stock-based compensation
Issuance of convertible voting
   preferred stock, net of offering
   costs of $4.0 million
Net loss

Balance—December 31, 2019
Conversion of Series A
   convertible voting preferred
   stock to common stock
Reclassification of warrant
   liabilities to equity
Issuance of common stock in
   connection with an amendment
   to the asset purchase agreement
Issuance of warrant in connection
   with an amendment to the
   asset purchase agreement
Reverse stock split adjustment
Stock-based compensation
Issuance of common stock from
   an At-The-Market equity
   offering, net of offering
   costs of $0.4 million
Net loss

Balance—December 31, 2020

—     

—     

546,250     

22     

45,974     

—     

45,996 

—     
—     
—     

—     
—     

—     
—     
—     

—     
—     

—     
—     
1,859,120     

8,056     
—     

—     
—     
74     

—     
—     

116     
—     
771,817     

—     
(53,335)    
(677,412)    

116 
(53,335)
94,479 

445     
5,695     

—     
—     

445 
5,695 

103,000     
—     
103,000     

1     
—     
1     

—     
—     
1,867,176     

—     
—     
74     

74,000     
—     
851,957     

—     
(88,275)    
(765,687)    

74,001 
(88,275)
86,345 

(103,000)    

(1)    

7,803,273     

8     

(7)    

—     

— 

—     

—     

—     

—     

62,175     

—     

62,175 

—     

—     

725,283     

1     

8,781     

—     

8,782 

—     
—     
—     

—     
—     
—    $

—     
—     
—     

—     
—     
—     

—     
(73)    
—     

3,188     
73     
9,470     

—     
—     
—     

3,188 
— 
9,470 

732,752     
—     
—     
—     
—      11,128,484    $

1     
—     
11    $

8,900     
—     
944,537    $

—     
(80,902)    
(846,589)   $

8,901 
(80,902)
97,959

The accompanying notes are an integral part of these consolidated financial statements.

103

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
 
 
 
SIERRA ONCOLOGY, INC.

Consolidated Statements of Cash Flows
(in thousands)

CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Changes in fair value of warrant liabilities
Securities issuance obligation
Stock-based compensation
Depreciation and amortization
Asset impairment
Other
Warrant issuance costs
Term loan repayment fee
Changes in operating assets and liabilities:
Prepaid expenses and other assets
Accrued, other and operating lease liabilities
Accounts payable

Net cash used in operating activities

CASH FLOWS FROM INVESTING ACTIVITIES:

Purchase of property and equipment

Net cash used in investing activities

CASH FLOWS FROM FINANCING ACTIVITIES:

Proceeds from issuance of common stock from At-The-Market equity
   offering, net of offering costs
Proceeds from public offering, net of offering costs
Proceeds of term loan and repayment fee
Proceeds from exercise of common stock options
Proceeds from issuance of common stock upon follow-on offering, net of
   offering costs
Proceeds from issuance of term loan, net of issuance costs
Net cash provided by financing activities

Effect of foreign exchange rate changes on cash, cash equivalents and
   restricted cash

NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND
   RESTRICTED CASH
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — Beginning
   of period
CASH, CASH EQUIVALENTS AND RESTRICTED CASH — End
   of period
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:

Cash paid for (refund of) income taxes, net
Cash paid for interest

SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND
   FINANCING INFORMATION:

Issuance of common stock and common stock warrant in connection with
   an amendment to the asset purchase agreement
Reclassification of warrant liabilities to equity
Unpaid deferred financing costs in accrued and other liabilities
Right-of-use asset obtained in exchange for operating lease obligation
Issuance costs of convertible voting preferred stock and warrants included
   in accrued and other liabilities
Issuance of common stock warrant

2020

Year Ended
December 31,
2019

2018

  $

(80,902)   $

(88,275)   $

(53,335)

16,240   
1,485   
9,470   
238   
106   
201   
—   
—   

(33)  
(366)  
1,194   
(52,367)  

(12)  
(12)  

8,901   
—   
—   
—   

—   
—   
8,901   

5   

(43,473)  

147,828   

20,926   
10,485   
5,695   
83   
—   
161   
1,279   
438   

336   
(2,034)  
(277)  
(51,183)  

(39)  
(39)  

—   
97,731   
(5,438)  
445   

—   
—   
92,738   

(34)  

41,482   

106,346   

  $

  $
  $

  $
  $
  $
  $

  $
  $

104,355    $

147,828    $

28    $
—    $

11,970    $
62,175    $
10    $
—    $

—    $
—    $

(69)   $
336    $

—    $
—    $
—    $
771    $

268    $
—    $

— 
— 
6,796 
111 
— 
(68)
— 
— 

(1,341)
2,770 
(48)
(45,115)

(118)
(118)

— 
— 
— 
180 

45,996 
4,955 
51,131 

(88)

5,810 

100,536 

106,346 

15 
87 

— 
— 
— 
— 

— 
116  

The accompanying notes are an integral part of these consolidated financial statements.  

104

 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
SIERRA ONCOLOGY, INC.

Notes to Consolidated Financial Statements

1.

The Company and Basis of Presentation

Organization and Description of Business

Sierra Oncology, Inc. (together with its subsidiaries, collectively referred to as the “Company”), a Delaware corporation, is a late-stage
biopharmaceutical company on a quest to deliver targeted therapies that treat rare forms of cancer. The Company’s main focus is the development
of momelotinib, an investigational agent for the treatment of myelofibrosis. Momelotinib is a selective and orally-bioavailable JAK1 (Janus kinase
1), JAK2 (Janus kinase 2) and ACVR1 (Activin A receptor type 1) inhibitor with a differentiated mechanism of action that enables it to potentially
address all three key manifestations of myelofibrosis: anemia of inflammation, constitutional symptoms and enlarged spleen. Currently,
momelotinib is in a global Phase 3 clinical trial for patients with myelofibrosis, called the MOMENTUM study, that if successful will be
registration enabling. At its completion, approximately 1,000 myelofibrosis patients will have received momelotinib, and several of our clinical
trial patients remain on treatment more than 10 years later.

The Company’s portfolio also includes SRA737, a selective, orally bioavailable small molecule inhibitor of Checkpoint kinase 1 (Chk1), an
emerging target for the treatment of cancer which has a key role in the DNA Damage Response (DDR).

The Company’s primary activities since inception have been conducting research and development activities, conducting preclinical and clinical
testing, recruiting personnel, performing business and financial planning, identifying and evaluating additional drug candidates for potential in-
licensing or acquisition, and raising capital to support development activities.

The Company has not generated any product revenue related to its primary business purpose to date, nor has it generated any net income, and is
subject to a number of risks and uncertainties, which include dependence on key individuals, the need to identify and successfully develop
commercially viable products, the need to obtain regulatory approval for its products and commercialize them, and the need to obtain adequate
additional financing to fund the development of momelotinib.

As of December 31, 2020, the Company had $104.1 million of cash and cash equivalents. The Company believes that its balance of cash and cash
equivalents as of the date of the issuance of these consolidated financial statements is sufficient to fund its current operational plan for at least the
next twelve months though it may pursue raising additional capital through equity financings or other arrangements.

Follow-On Offerings

On March 6, 2018, the Company completed an underwritten public offering of an aggregate of 546,250 shares of common stock, including the
underwriters’ exercise of their overallotment option, at a price to the public of $90.00 per share. The aggregate net proceeds received by the
Company from the offering were $46.0 million, net of underwriting discounts and commissions and offering expenses of $3.2 million.

On November 13, 2019, the Company completed an underwritten public offering of an aggregate of (i) 103,000 shares of Series A convertible
voting preferred stock (Series A Preferred Stock), (ii) Series A warrants to purchase up to an aggregate of 7,802,241 shares of common stock at an
exercise price equal to $13.20, and (iii) Series B warrants to purchase up to an aggregate of 2,574,727 shares of common stock at an exercise price
equal to $13.20. Each share of Series A Preferred Stock and the accompanying Series A and Series B warrants were issued at a combined purchase
price to the public of $1,000. The aggregate net proceeds received by the Company from the offering were $97.7 million, net of underwriting
discounts and commissions and offering expenses of $5.3 million. On January 29, 2020, all shares of Series A Preferred Stock converted into
7,803,273 shares of common stock.

105

At-The-Market Common Stock Offerings

In August 2020, the Company entered into an open market sales agreement, pursuant to which it can issue and sell an aggregate of up to $20.0
million of its common stock from time to time in At-The-Market (ATM) offerings. During the year ended December 31, 2020, the Company sold
732,752 shares under the ATM program for net proceeds of $8.9 million, net of commissions and offering expenses.

In February 2021, the Company filed a prospectus supplement pursuant to which it can issue and sell an aggregate of up to $30.0 million of its
common stock from time to time in ATM offerings.

Reverse Stock Split

On January 21, 2020, the Company’s shareholders approved an amendment to the Company’s certificate of incorporation to effect a reverse split of
the Company’s common stock (Reverse Stock Split). On January 21, 2020, the Company’s board of directors approved the specific ratio for the
Reverse Stock Split, which became effective on January 22, 2020, at 1-for-40. The authorized shares and par value of the common and preferred
stock were not adjusted as a result of the Reverse Stock Split. All issued and outstanding common stock, warrants for common stock, options for
common stock and per share amounts contained in the consolidated financial statements have been retroactively adjusted to reflect this Reverse
Stock Split for all periods presented.  

2.

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United
States of America (U.S. GAAP). The accompanying consolidated financial statements include the accounts of Sierra Oncology, Inc. and its wholly-
owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of the consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions
that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of consolidated financial
statements and the reported amounts of expense during the reporting period. Significant estimates and assumptions made in the accompanying
consolidated financial statements include, but are not limited to the fair values of stock options and warrants issued, the convertible voting
preferred stock and securities issuance obligation, the probability of achieving performance-based milestones of stock options, accruals such as
research and development costs, and recoverability of the Company’s net deferred tax assets, and related valuation allowance. The Company
evaluates its estimates and assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and
assumptions when facts and circumstances dictate. Actual results could materially differ from those estimates.

Foreign Currency

The functional currency of the Company’s foreign subsidiaries is the U.S. Dollar. Transactions denominated in currencies other than the functional
currency are recorded at prevailing exchange rates during the period. At the end of each reporting period, monetary assets and liabilities are
remeasured to the functional currency using exchange rates in effect at the balance sheet date. Non-monetary assets and liabilities are recorded at
historical exchange rates. Gains and losses related to remeasurement are recorded in other income (expense), net in the consolidated statements of
operations. The net foreign exchange transaction gains (losses) included in other income (expense), net in the accompanying consolidated
statements of operations were insignificant for the years ended December 31, 2020, 2019 and 2018.

106

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original maturity of three months or less from the date of purchase to be cash
equivalents. Cash and cash equivalents consist primarily of funds invested in readily available checking and savings accounts and highly liquid
investments in money market funds.

Restricted Cash

Restricted cash, which consists of funds invested in a money market fund, represents collateral for a corporate credit card facility and is included in
other assets in the accompanying consolidated balance sheets.

Concentrations of Credit Risk

Financial instruments that subject the Company to significant concentrations of credit risk consist of cash, cash equivalents and restricted cash. All
of the Company’s cash, cash equivalents and restricted cash are held at financial institutions in the United States and Canada that management
believes to be of high credit quality. Deposits held in the United States and Canada with these financial institutions exceed federally insured limits.

The primary focus of the Company’s investment strategy is to preserve capital and meet liquidity requirements. The Company’s investment policy
addresses the level of credit exposure by limiting the concentration in any one corporate issuer and establishing a minimum allowable credit rating.

Fair Value of Financial Instruments

The Company’s cash and cash equivalents, restricted cash, other current assets, accounts payable and accrued liabilities approximate their fair
values at December 31, 2020 and 2019, due to their short duration. The warrant liabilities and securities issuance obligation contained
unobservable inputs that reflected the Company’s own assumptions in which there was little, if any, market activity at the measurement date, thus
the Company’s warrant liabilities and securities issuance obligation were measured at their fair values on a recurring basis using unobservable
inputs until such time the warrants were no longer considered derivative instruments and the securities issuance obligation was settled.

The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent
possible. The Company determines the fair value of its financial instruments based on assumptions that market participants would use in pricing an
asset or liability in the principal or most advantageous market. When considering market participant assumptions in fair value measurements, the
following fair value hierarchy distinguishes between observable and unobservable inputs, which are categorized in one of the following levels:

Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date;

Level 2—Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for
identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by
observable market data for substantially the full term of the related assets or liabilities; and

Level 3—Unobservable inputs that are significant to the measurement of the fair value of the assets or liabilities that are supported by little
or no market data.

Property and Equipment, Net

Property and equipment, net are stated at cost, less accumulated depreciation. Depreciation on property and equipment, excluding leasehold
improvements, is computed using the straight-line method over the estimated useful lives of the respective assets, generally three to five years.
Leasehold improvements are amortized on a straight-line basis over the shorter of the estimated useful lives of the assets or the remaining lease
term. Depreciation begins at the time the asset is placed in service. Maintenance and repairs are charged to operations as incurred. Upon sale or
retirement of assets, the cost and related accumulated depreciation are removed from the consolidated balance sheet and the resulting gain or loss is
reflected in the consolidated statement of operations.

107

Other Assets

Other assets consist primarily of restricted cash pledged as collateral for a corporate credit card facility and deferred income tax assets in foreign
jurisdictions.

Operating Lease Right-of-Use Asset and Lease Liability

The Company recognizes an operating lease with terms greater than one year as right-of-use (ROU) asset and lease liability on its consolidated
balance sheet using the portfolio approach. Lease liability and ROU asset are recorded based on the present value of future lease payments over the
contractual term of the operating lease. The Company utilized its incremental borrowing rate from information available as at the date of initial
adoption in determining the present value of the future lease payments. The lease liability and ROU asset are amortized over the term of the lease.

Warrant Liabilities

The Company accounted for its warrants issued in connection with its November 2019 financing based upon the characteristics and provisions of
the instruments. Warrants classified as derivative liabilities were recorded on the Company’s consolidated balance sheets at their fair value on the
date of issuance and remeasured to fair value on each subsequent reporting period, with the changes in fair value recognized as a component of
other income (expense), net in the accompanying consolidated statements of operations. The Company revalued the warrant liabilities until they
ceased to be derivative instruments, at which time they were reclassified to additional paid-in capital at their fair value. The Company estimated the
fair value of these liabilities using the Black-Scholes option-pricing model and the fair value of the underlying stock, as well as assumptions for
expected volatility, expected term and risk-free interest rate. An estimated non-marketable discount was also applied if applicable. Offering
expenses arising from the issuance of warrants are expensed as incurred.

Securities Issuance Obligation

The Company recognized its securities issuance obligation pursuant to the amendment to the Asset Purchase Agreement with Gilead Sciences, Inc.
(Gilead) at their fair values on the date such obligations arose. At the end of each reporting period, changes in estimated fair values during the
period were recognized as research and development costs in the accompanying consolidated statements of operations. The Company adjusted the
fair values of the obligations until the securities issuance obligation was settled, at which time the liabilities were reclassified to common stock and
additional paid-in capital at their fair values. The Company determined the fair values of these obligations based upon the individual characteristics
and provisions of the securities to be issued. The Company estimated the fair value of its obligation to issue common stock using the fair value of
the underlying stock and a non-marketable discount. The Company estimated the fair value of its obligation to issue warrant using the Black-
Scholes option-pricing model and the fair value of the underlying stock, as well as assumptions for expected volatility, expected term and risk-free
interest rate. An estimated non-marketable discount was also applied if applicable.

Research and Development Costs

Research and development costs are expensed as incurred. The Company accounts for non-refundable advance payments for goods and services
that will be used in future research and development activities as expenses when the goods have been received or when the service has been
performed rather than when the payment is made. Depending on the timing of payments to service providers of research and development costs,
the Company recognizes prepaid expenses or accrued expenses related to these costs. These prepaid or accrued expenses are based on
management’s estimates of the work performed under service agreements and milestones achieved. In the event that a clinical trial is terminated
early, the Company records an accrual for the estimated remaining costs to complete the trial in the period of termination.

Upfront payments made in connection with license and asset purchase agreements are expensed as research and developments costs, as the assets
acquired do not have alternative future use. Contingent milestone payment obligations due to third parties under license and asset purchase
agreements are expensed when the milestones are considered probable of occurring. To the extent an obligation is to be settled by future issuance
of securities, the fair value of these instruments is recorded in research and development expense until the securities are issued.

108

Research and development costs include fees incurred in connection with license and asset purchase agreements and their related amendments,
compensation and other related costs for employees engaged in research and development, costs associated with research and preclinical studies,
clinical trials, regulatory activities, manufacturing activities to support clinical activities, fees paid to external service providers that conduct certain
research and development, clinical, and manufacturing activities on behalf of the Company and an allocation of overhead expenses.

Stock-Based Compensation

The Company accounts for stock-based payments at fair value, which is measured using the Black-Scholes option-pricing model. For stock-based
awards that vest subject to the satisfaction of a service requirement, the fair value measurement date for stock-based compensation awards is the
date of grant and the expense is recognized on a straight-line basis over the vesting period, which is generally the service period. For stock-based
awards that vest subject to the satisfaction of a service requirement and a performance component, the fair value measurement date is the date of
grant and the expense is recognized over the requisite service period as achievement of the performance objective becomes probable. The
Company accounts for forfeitures as they occur.

Income Taxes

The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are
determined based on the differences between the financial reporting and the tax bases of assets and liabilities and are measured using the enacted
tax rates and laws that will be in effect when the differences are expected to reverse. Management makes an assessment of the likelihood that the
resulting deferred tax assets will be realized. A valuation allowance is provided when it is more likely than not that some portion or all of a
deferred tax asset will not be realized. Due to the Company’s historical operating performance and the recorded cumulative net losses in prior fiscal
periods, the net U.S. deferred tax assets have been offset by a full valuation allowance.

The Company recognizes uncertain income tax positions at the largest amount that is more likely than not to be sustained upon audit by the
relevant taxing authority. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. Changes
in recognition or measurement are reflected in the period in which judgment occurs. The Company recognizes interest and penalties related to the
underpayment of income taxes as a component of provision for (benefit from) income taxes, net.

Segment Information

Operating segments are components of an enterprise for which separate financial information is available and is evaluated regularly by the
Company’s chief operating decision maker in deciding how to allocate resources and assessing performance. The Company’s chief operating
decision maker is its Chief Executive Officer.

The Company’s Chief Executive Officer views the Company’s operations and manages its business in one operating segment, which is the business
of researching, developing and commercializing therapies for the treatment of patients with hematology and oncology needs. Accordingly, the
Company has a single reporting segment.

3.

Net Loss Per Share

Basic net loss per share is calculated by dividing net loss by the weighted-average number of common stock outstanding during the period without
consideration for common stock equivalents. In 2019, preferred stock with characteristics of common stock was also included in the determination
of the weighted average. Diluted net loss per share is computed by dividing net loss by the weighted-average number of common stock equivalents
outstanding for the period determined using the treasury-stock method. For purposes of this calculation, stock options and warrants for common
stock are considered to be common stock equivalents and are only included in the calculation of diluted net loss per share when their effect is
dilutive.

109

The following shares of common stock equivalents were excluded from the calculation of diluted net loss per share for the periods presented
because including them would have been antidilutive:

Series A warrants for common stock
Series B warrants for common stock
Options to purchase common stock
Warrants for common stock

Total potential dilutive shares

As of December 31,

2020
7,802,241     
2,574,727     
4,146,928     
727,122     
15,251,018     

2019
7,802,241     
2,574,727     
326,023     
1,839     
10,704,830     

2018

— 
— 
262,539 
1,839 
264,378

Also excluded from the calculation of diluted net loss per share are 450,000 shares of common stock issued by the Company in January 2021,
under its ATM program for proceeds of $7.1 million, net of commissions.

4.

Fair Value Measurements

The Company measures and reports its cash equivalents, restricted cash, warrant liabilities and securities issuance obligation at fair value. The
following table sets forth the fair value of the Company’s financial assets and liabilities measured on a recurring basis by level within the fair value
hierarchy:

Financial Assets

Money market funds
Restricted money market funds

Total financial assets

Financial Assets

Money market funds
Restricted money market funds

Total financial assets

Financial Liabilities
Warrant liabilities
Securities issuance obligation
Total financial liabilities

Level 1

Level 2

Level 3

Total

December 31, 2020

(in thousands)

  $

  $

101,919    $
300     
102,219    $

—    $
—     
—    $

—    $
—     
—    $

101,919 
300 
102,219

Level 1

Level 2

Level 3

Total

December 31, 2019

(in thousands)

  $

  $

  $

  $

146,240    $
300     
146,540    $

—    $
—     
—    $

—    $
—     
—    $

—    $
—     
—    $

—    $
—     
—    $

146,240 
300 
146,540 

45,935    $
10,485    $
56,420    $

45,935 
10,485 
56,420

Money market funds and restricted money market funds are measured at fair value on a recurring basis using quoted prices and are classified as a
Level 1 input.

The Company’s warrant liabilities and securities issuance obligation contained unobservable inputs that reflected the Company’s own assumptions
in which there was little, if any, market activity at the measurement date. Accordingly, the Company’s warrant liabilities and securities issuance
obligation were measured at fair value on a recurring basis using unobservable inputs at each reporting period. The warrant liabilities and securities
issuance obligation were classified as Level 3 inputs. These liabilities were shown as current liabilities on the balance sheet until such time the
warrants were no longer considered derivative instruments and the securities issuance obligation was settled.

110

 
 
 
 
 
 
   
   
 
   
   
   
   
   
 
 
 
 
 
 
 
 
   
   
   
 
 
 
 
     
       
       
       
 
   
 
 
 
 
 
 
 
   
   
   
 
 
 
 
   
      
      
      
  
   
   
      
      
      
  
   
 
 
The fair values of the Series A and Series B warrants were estimated using the Black-Scholes option-pricing model. The expected terms
represented the periods that the warrants are expected to be outstanding. The risk-free interest rates were based on the U.S. Constant Maturity
treasury curve commensurate with the time to expiry. The expected dividend was zero as the Company has not paid nor does it anticipate paying
any dividends on its common stock in the foreseeable future. The expected volatilities were estimated by backsolving to volatility implied in the
transaction price. Discount for lack of marketability was dependent on the restriction period and the estimated volatility during the period.

The fair value of the warrant issuance obligation was estimated using the Black-Scholes option-pricing model. The expected term represented the
period that the underlying warrant is expected to be outstanding from the time the issuance obligation arose. The risk-free interest rate was based
on the U.S. Constant Maturity treasury curve commensurate with the time to expiry. The expected dividend was zero as the Company has not paid
nor does it anticipate paying any dividends on its common stock in the foreseeable future. The expected volatility was estimated by backsolving to
volatility implied in the transaction price. The fair value of the common stock issuance obligation was estimated based on the fair value of the
underlying common stock. Discount for lack of marketability was dependent on the restriction period and the estimated volatility during the period.

The assumptions used in calculating the estimated fair values at the end of the reporting period represent the Company’s best estimate. However,
inherent uncertainties are involved. If factors or assumptions change, the estimated fair values could be materially different.

At November 13, 2019, upon the issuance of Series A and Series B warrants and when the securities issuance obligation arose, the Company
estimated the fair values of the financial liabilities using the following assumptions:

Expected term (in years)
Expected volatility
Risk-free interest rate
Expected dividend yield
Discount for lack of marketability

Series A
Warrant

Series B
Warrant

Warrant
Issuance
Obligation

Common
Stock
Issuance
Obligation

5.2 
43%    
1.70%    
— % 

30%    

2.3 
88%    
1.64%    
— % 

30%    

5.2 
43%  
1.70%  
— % 

32%    

N/A 
N/A 
N/A 
N/A 

32%

At December 31, 2019, the Company remeasured these liabilities to their fair values using the following assumptions:

Expected term (in years)
Expected volatility
Risk-free interest rate
Expected dividend yield
Discount for lack of marketability

Series A
Warrant

Series B
Warrant

Warrant
Issuance
Obligation

Common
Stock
Issuance
Obligation

5.1 
43%    
1.69%    
— % 

25%    

2.2 
88%    
1.59%    
— % 

25%    

5.1 
43%  
1.70%  
— % 

25%    

N/A 
N/A 
N/A 
N/A 

25%

111

 
 
 
 
 
 
 
 
 
 
   
   
   
 
   
   
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
   
   
   
 
   
   
 
 
 
 
   
At January 22, 2020, Series A and Series B warrants were no longer considered to be derivative instruments. The Company remeasured the fair
value of the warrant liabilities at the time of reclassification to equity using the following assumptions:

Expected term (in years)
Expected volatility
Risk-free interest rate
Expected dividend yield

Series A
Warrant

Series B
Warrant

5.0 
43%    
1.57%    
—%    

2.1 
88%
1.53%
—%

At January 31, 2020, the securities issuance obligation was settled by the issuance of common stock and a common stock warrant. The Company
remeasured the fair value of its common stock issuance obligation based on the value of the common stock at the time of issuance. The warrant
issuance obligation was remeasured using the following assumptions:

Expected term (in years)
Expected volatility
Risk-free interest rate
Expected dividend yield

Warrant
Issuance
Obligation

5.0 
43%
1.57%
— %

The following table provides a summary of changes in the estimated fair values of the Company’s Level 3 financial liabilities, which were
measured at fair value on a recurring basis using unobservable inputs:

Balance, December 31, 2018
Issuance of warrants
Securities issuance obligation
Changes in fair value
Balance, December 31, 2019
Changes in fair value
Settlement of financial liabilities by
   securities issuance
Reclassification to equity
Balance, December 31, 2020

Series A
Warrant
Liability

Series B
Warrant
Liability

Warrant
Issuance
Obligation    

(in thousands)

Common
Stock
Issuance
Obligation    

  $

—    $
17,133    
—    
15,483    
32,616    
11,597    

—    $
7,876    
—    
5,443    
13,319    
4,643    

—    $
—    
1,543    
1,493    
3,036    
152    

—    $
—    
4,903    
2,546    
7,449    
1,333    

Total

— 
25,009 
6,446 
24,965 
56,420 
17,725 

—    
(44,213)   
—    $

—    
(17,962)   
—    $

(3,188)   
—    
—    $

(8,782)   
—    
—    $

(11,970)
(62,175)
—

  $

Fluctuations in fair values of the financial liabilities were attributable to changes in the fair value of the underlying stock and non-marketable
discount.

There were no transfers between Levels 1, 2 or 3 during the years ended December 31, 2020 and 2019.

112

 
 
 
 
 
 
 
 
   
   
   
   
   
 
 
 
 
 
   
   
   
 
 
 
 
 
 
   
   
 
 
 
 
   
   
   
   
   
   
   
 
 
5.

Balance Sheet Components

Cash and Cash Equivalents

Cash and cash equivalents consist of the following:

Cash
Cash equivalents:

Money market accounts

Total cash and cash equivalents

December 31,
2020

December 31,
2019

(in thousands)
2,136    $

1,288 

101,919     
104,055    $

146,240 
147,528

  $

  $

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the consolidated balance sheets to the
amounts shown in the consolidated statements of cash flows.

Cash and cash equivalents
Restricted cash included in other assets

Total cash, cash equivalents and restricted cash
   shown in the condensed consolidated statement
   of cash flows

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

Prepaid insurance
Prepaid research and development project costs
Other receivables
Other

Total prepaid expenses and other current assets

Property and Equipment, net

Property and equipment, net consists of the following:

Software
Leasehold improvements
Computer equipment
Furniture and fixtures

Property and equipment, gross

Less: accumulated depreciation

Total property and equipment, net

113

December 31,
2020

December 31,
2019

  $

(in thousands)

104,055    $
300     

147,528 
300 

  $

104,355    $

147,828

December 31,
2020

December 31,
2019

(in thousands)
991    $
321     
311     
792     
2,415    $

918 
853 
190 
408 
2,369

December 31,
2020

December 31,
2019

(in thousands)
361    $
—     
—     
—     
361     
(309)    
52    $

352 
112 
89 
3 
556 
(443)
113

  $

  $

  $

  $

 
 
 
   
 
 
 
 
   
      
  
   
 
 
 
 
 
   
 
 
 
 
   
 
 
 
 
 
   
 
 
 
 
   
   
   
 
 
 
 
 
   
 
 
 
 
   
   
   
   
   
 
 
Depreciation related to the Company’s property and equipment for each of the years ended December 31, 2020, 2019 and 2018 was $0.1 million.

Accrued and Other Liabilities

Accrued and other liabilities consist of the following:

Accrued employee related costs
Accrued research and development costs
Accrued professional fees
Operating lease liability
Other

Total accrued and other liabilities

December 31,
2020

December 31,
2019

  $

  $

(in thousands)
4,359    $
1,715     
774     
207     
93     
7,148    $

3,420 
2,668 
817 
187 
78 
7,170

6.

Leases

The Company entered into an operating lease agreement to lease the office space in Vancouver, Canada commencing March 1, 2018. The lease
expires on February 28, 2023.  In December 2020, the Company entered into an agreement to sublet the entire office premises to a third party until
February 27, 2023. Pursuant to the sublease agreement, the subtenant will pay base rent of $0.2 million per annum and all operating costs to the
Company. The Company recorded an impairment charge of $0.1 million during the year ended December 31, 2020.

The components of lease expense, which are recorded in general and administrative expense, and related cash flows for the year ended
December 31, 2020 and 2019 were as follows:

Operating lease cost
Short-term lease cost

Operating cash flows used for operating leases

The total rent expense was $0.5 million for the year ended December 31, 2018.

Year ended December 31,
2019
2020

(in thousands)
195    $
42     
237     

212    $

203 
117 
320 

198

  $

  $

As of December 31, 2020, the weighted average remaining lease term and discount rate for the operating lease are 2.2 years and 6.5%, respectively.

As of December 31, 2020, maturities of lease liability due under the lease agreement are as follows:

Years Ending December 31:

2021
2022
Total lease payments
Less imputed interest

Total

Operating
Leases
(in thousands)

226 
180 
406 
(24)
382

  $

In addition to base rent, this lease requires payment of operating costs. These costs are not included in the table above.

114

 
 
 
   
 
 
 
 
   
   
   
   
 
 
 
 
 
 
 
 
   
 
 
 
 
   
 
   
 
 
 
 
 
 
 
 
   
   
   
   
 
 
 
In December 2020, the Company entered into a 48-month operating lease agreement to lease office space in San Mateo, California. The lease has
not commenced as of December 31, 2020. The Company’s obligation under this office lease is $0.1 million for 2021, $0.2 million for each of 2022,
2023 and 2024, and $0.1 million for 2025. 

7.

Term Loan

In August 2018, the Company entered into a Loan and Security Agreement (Loan Agreement) with Silicon Valley Bank (SVB).
Contemporaneously with executing the Loan Agreement, the Company drew down the first $5.0 million tranche. In December 2019, the Company
repaid the $5.0 million term loan and paid the prepayment and final payment fees of $0.1 million and $0.3 million, respectively. In connection with
the Loan Agreement, the Company issued a warrant to SVB to purchase 1,839 of the Company’s common stock at a price per share of $74.80. The
warrant was immediately exercisable, will expire on August 21, 2028, contains a cashless exercise provision and is classified as equity.

No interest expense was recognized for the year ended December 31, 2020. The Company recognized interest expense related to the Loan
Agreement of $0.9 million for the year ended December 31, 2019, including the final payment fee, the prepayment fee and the unamortized portion
of the debt issuance costs. Interest expense for the year ended December 31, 2018 was $0.2 million.

8.

Commitments and Contingencies

Asset Purchase Agreement

In August 2018, the Company entered into an Asset Purchase Agreement with Gilead whereby the Company acquired worldwide rights to the
pharmaceutical product momelotinib, an investigational orally-bioavailable JAK1, JAK2 and ACVT1 inhibitor together with all related intellectual
property rights and certain other related assets. Pursuant to the agreement, the Company made a one-time upfront payment of $3.0 million in
August 2018. The related expense was included in research and development for the year ended December 31, 2018 in the accompanying
consolidated statement of operations. In October 2019, the Company entered into an amendment to the Asset Purchase Agreement in which the
Company agreed to issue, subject to certain conditions, shares of common stock and a warrant to purchase common stock to Gilead in
consideration for meaningfully reduced royalty rates and elimination of a near term milestone payment in the Asset Purchase Agreement. Pursuant
to the amended agreement, milestone payments of up to an aggregate of $190.0 million may become payable to Gilead upon the achievement of
certain regulatory and commercial milestone events and the Company is required to pay Gilead low double-digit to high-teens percent tiered
combined royalties based upon net sales.

In connection with obligations under the amendment, the Company recognized a $10.5 million non-cash research and development expense for the
year ended December 31, 2019 based on the fair value of the securities to be issued. On January 31, 2020, the Company fulfilled its obligation to
issue securities by entering into a securities purchase agreement with Gilead, pursuant to which the Company issued to Gilead 725,283 shares of
the Company’s common stock and a warrant to purchase 725,283 shares of common stock at a price per share of $13.20. The warrant is
immediately exercisable, will expire on January 31, 2025 and contains a cash and/or cashless exercise provision. Upon remeasurement of the
securities issuance obligation immediately prior to the issuance, an additional $1.5 million of non-cash research and development expense,
representing changes in fair value of the securities since December 31, 2019, was recognized in the consolidated statement of operations for the
year ended December 31, 2020. See Note 4, Fair Value Measurement for further discussions in valuation techniques.

115

License Agreements

In September 2016, the Company entered into an exclusive license agreement with CRT Pioneer Fund LP (CPF) for worldwide rights, know-
how and materials to develop SRA737, a small molecule inhibitor targeting Chk1, a promising therapeutic target to treat cancer. Pursuant to the
agreement, the Company made a one-time upfront payment of $7.0 million to CPF in October 2016 and paid $2.0 million to CPF in January 2017
for the successful transfer of two ongoing Phase 1 clinical trials. Pursuant to the original license agreement, additional milestone payments of up to
an aggregate of $319.5 million may have become payable to CPF upon the achievement of certain milestones. In November 2020, the Company
entered into an amendment to the license agreement with CPF, which amended the terms and reduced the amounts of certain future milestones.
Pursuant to the amended agreement, future milestone payments of up to an aggregate of $290.0 million may become payable to CPF upon the
achievement of certain developmental, regulatory and commercial milestones, including a milestone payment of $2.0 million upon the dosing of
the first patient of the first trial of SRA737 following the effective date of the amendment. These milestones will be accrued once they are
considered probable of occurring. In addition, the Company is required to pay CPF, on a product-by-product and country-by-country basis, tiered
high single-digit to low double-digit royalties on the net sales of any product successfully developed.

In May 2016, the Company entered into an exclusive license agreement (Carna License Agreement) with Carna Biosciences, Inc. (Carna) for
worldwide rights to develop and commercialize SRA141, a small molecule kinase inhibitor targeting Cdc7. In exchange for this exclusive right, the
Company paid Carna an upfront payment of $0.9 million in June 2016. In June 2020, the Company entered into a collaboration agreement (Carna
Collaboration Agreement) with Carna effectively terminating the Carna License Agreement. Pursuant to the Carna Collaboration Agreement,
Carna paid an upfront fee of $0.3 million, which was recognized as collaboration revenue during the year ended December 31, 2020 by the
Company, for the exclusive worldwide rights for SRA141 and other transition services. In addition, the Company may be entitled to single-digit
royalties on product sales, on a product-by-product basis, and low to mid-teen profit share on royalty and non-royalty income.

Legal

From time to time, the Company may become subject to other legal proceedings, claims and litigation arising in the ordinary course of business. In
addition, the Company may receive letters alleging infringement of patent or other intellectual property rights. The Company is not currently a
party to any other material legal proceedings, nor is it aware of any pending or threatened litigation that, in the Company’s opinion, would have a
material adverse effect on the business, operating results, cash flows or financial condition should such litigation be resolved unfavorably.

COVID-19

The full extent of the impact of the COVID-19 pandemic on financial markets, economies worldwide and our business is highly uncertain.
Research and development expenses and general and administrative expenses may vary significantly if there is an increased impact from COVID-
19 on the costs and timing associated with the conduct of clinical trials and other related business activities. The Company is carefully monitoring
the pandemic and the potential length and depth of the resulting economic impact on its financial condition and results of operations. As of
December 31, 2020, the Company was not aware of any contingencies and no related estimates were recorded on its financial statements as a result
of COVID-19.

116

 
9.

Common Stock

 The Company is required to reserve and keep available out of its authorized but unissued shares of common stock a number of shares sufficient to
effect the conversion of all outstanding preferred stock, options granted and available for grant under the incentive plans, shares reserved for
issuance under the employee stock purchase plan and issued warrant.

Shares reserved under Series A warrant
Shares reserved under Series B warrant
Shares reserved for future option grants under equity plans
Outstanding stock options under equity incentive plans
Outstanding warrants
Shares reserved under the 2015 employee stock purchase plan
Shares reserved for conversion of Series A Preferred Stock

Total common stock reserved for issuance

December 31,
2020
7,802,241     
2,574,727     
1,117,796     
4,146,928     
727,122     
17,500     
—     
16,386,314     

December 31,
2019
7,802,241 
2,574,727 
51,514 
326,023 
1,839 
17,500 
7,803,273 
18,577,117

10.

Preferred Stock

As of December 31, 2020 and 2019, the Company had 10,000,000 shares of preferred stock authorized with a par value of $0.001. There were no
shares of preferred stock issued and outstanding as of December 31, 2020 and 103,000 shares of Series A Preferred Stock outstanding as of
December 31, 2019.

Series A Convertible Voting Preferred Stock

On November 13, 2019, the Company completed an underwritten public offering whereby it issued 103,000 shares of Series A Preferred Stock
together with Series A warrants and Series B warrants for a combined purchase price of $1,000. The aggregate proceeds received by the Company
was $97.7 million, net of underwriting discounts and commissions and offering expenses. Each share of Series A Preferred Stock was convertible
into shares of the Company’s common stock equal to the stated value of the Series A Preferred Stock of $1,000 divided by the voting conversion
price of $13.20. On January 29, 2020, all shares of Series A Preferred Stock converted into 7,803,273 shares of the Company’s common stock.

11.

Warrant Liabilities

In connection with the Company’s November 2019 public offering of the Series A Preferred Stock, the Company issued Series A warrants to
purchase up to 7,802,241 shares of common stock at an exercise price equal to $13.20, and Series B warrants to purchase up to 2,574,727 shares of
common stock at an exercise price equal to $13.20. Both Series A and Series B warrants are exercisable following stockholder approval in January
2020 of an increase in authorized common stock sufficient to allow for the exercise of the warrants, subject to certain beneficial ownership
limitations. The Series A warrants will expire five years from the date they first became exercisable or on January 22, 2025 and contain a cash
and/or cashless exercise provision. The Series B warrants will expire on the 75th day anniversary following the announcement of top-line data from
the Company’s MOMENTUM Phase 3 clinical trial of momelotinib and may only be exercised by paying the exercise price in cash, which would
amount to approximately $34.0 million in proceeds to the Company if fully exercised.

117

 
 
 
   
 
   
   
   
   
   
   
   
   
 
 
The Company revalued the warrant liabilities using the Black-Scholes option pricing model until they ceased to be derivative instruments,
following stockholder approval of an increase in authorized common stock sufficient to allow for the exercise of the warrants, at which time they
were reclassified to equity. The fair values of the Series A and Series B warrants at the time of issuance in November 2019, at December 31, 2019
and at the time they ceased to be derivative instruments in January 2020 were estimated to be $25.0 million, $45.9 million and $62.1 million,
respectively. The Company recorded a $16.2 million and $20.9 million non-cash expense relating to the change in fair value of warrant liabilities in
other income (expense), net in the accompanying consolidated statement of operations for the periods ended December 31, 2020 and 2019,
respectively. (see Note 4).

12.

Stock-Based Compensation

In the accompanying consolidated statement of operations, the Company recognized stock-based compensation expense for its employees and non-
employees as follows:

Research and development
General and administrative

Total stock-based compensation

Determination of Fair Value

2020

Year ended December 31,
2019
(in thousands)

2018

  $

  $

4,316    $
5,154     
9,470    $

3,873    $
1,822     
5,695    $

4,499 
2,297 
6,796

The estimated grant-date fair value of all the Company’s stock-based awards was calculated using the Black-Scholes option pricing model, based
on the following assumptions:

Expected term (in years)
Expected volatility
Risk-free interest rate
Expected dividend rate

2020
5.3 – 7.0 
87 – 90%    
0.3 – 1.2%    
—%    

Year Ended
December 31,
2019
5.3 – 6.9 
89 – 94%    
1.6 – 2.6%    
—%    

2018
5.3 – 7.0 
88 – 91%
2.6 – 3.1%
—%

The fair value of each stock option grant was determined by the Company on the date of grant using the methods and assumptions discussed below.
Each of these inputs is subjective and generally requires significant judgment and estimation by management.

Expected Term—The expected term represents the period that stock-based awards are expected to be outstanding. As the Company’s historical
share option exercise is limited due to a lack of sufficient data points, and does not provide a reasonable basis upon which to estimate an expected
term, the expected term is derived by using the midpoint between the weighted-average vesting term and the contractual expiration period of the
stock-based award.

Expected Volatility—The expected volatility is derived from a weighted volatility using both the Company’s trading history for its common stock
and the historical stock volatilities of peer public companies within its industry that are considered to be comparable to the Company’s business
over a period equivalent to the expected term of the stock-based awards.

Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the date of grant for zero-coupon U.S.
Treasury notes with maturities approximately equal to the stock-based awards’ expected term.

118

 
 
 
 
 
 
   
   
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
 
Expected Dividend Rate—The expected dividend is zero as the Company has not paid nor anticipate paying any dividends on its common stock in
the foreseeable future.

Forfeiture Rate—The Company accounts for forfeitures when they occur.

Equity Incentive Plans

2018 Equity Inducement Plan

In September 2018, the Company’s Compensation Committee approved the 2018 Equity Inducement Plan (2018 Plan). The number of shares
available for awards under the 2018 Plan was set to 37,500. On June 30, 2020, the Company’s Board of Directors approved an amendment to the
2018 Plan to increase the authorized number of shares available for issuance by 500,000 shares. As of December 31, 2020, 537,500 shares were
reserved for issuance under the 2018 Plan. On February 3, 2021, the Company’s Compensation Committee approved an amendment to the 2018
Plan to increase the authorized number of shares available for issuance by 500,000. The exercise price of each stock-based award issued under the
2018 Plan is required to be no less than the fair value of the Company’s common stock. The vesting and exercise provisions of options or restricted
awards granted are determined individually with each grant. Stock options have a 10-year life and expire if not exercised within that period or if
not exercised within three months of cessation of employment with the Company or such longer period of time as specified in the option
agreement.

2015 Plan

The 2015 Equity Incentive Plan (2015 Plan) became effective on July 14, 2015. On January 21, 2020, the Company’s stockholders approved the
following amendments to the 2015 Plan: (i) increase to the authorized number of shares available for issuance by 4,312,500 shares and
proportionately increase the share limit related to incentive stock options, (ii) provide limits on the total value of compensation that may be granted
to any non-employee director in each calendar year, and (iii) eliminate the annual individual grant limit to reflect changes to the tax law in 2017 tax
legislation.

As of December 31, 2020, 4,678,597 shares were reserved for issuance under the 2015 Plan. The number of shares reserved for issuance under the
2015 Plan will increase automatically on January 1 of each calendar year 2016 through 2025 by the number of shares equal to 4% of the total
outstanding shares of the Company’s common stock as of the immediately preceding December 31. The Company’s Board of Directors or
Compensation Committee may reduce the amount of the increase in any particular year. The exercise price of each stock-based award issued under
the 2015 Plan is required to be no less than the fair value of the Company’s capital stock. The vesting and exercise provisions of options or
restricted awards granted are determined individually with each grant. Stock options have a 10-year life and expire if not exercised within that
period or if not exercised within three months of cessation of employment with the Company or such longer period of time as specified in the
option agreement, unless modified.

119

2008 Plan

The Company granted options under the 2008 Stock Plan (2008 Plan) until July 2015 when it was terminated as to future awards, although it
continues to govern the terms of options that remain outstanding under the 2008 Plan. The 2008 Plan provided for the granting of Incentive Stock
Options (ISO), nonqualified stock options and stock purchase rights. In connection with the Board of Director’s approval of the 2015 Plan, all
remaining shares available for future award under the 2008 Plan were transferred to the 2015 Plan, and the 2008 Plan was terminated. A summary
of activity under the 2008 Plan, 2015 Plan and 2018 Plan and related information is as follows:

Outstanding — December 31, 2019

Awards authorized
Options granted
Options forfeited/cancelled
Outstanding — December 31, 2020

Exercisable — December 31, 2020

Vested and expected to vest —
   December 31, 2020

Shares
Available
for Grant

Number
of Shares
Outstanding

Options Outstanding

Weighted-
Average
Exercise
Price Per
Share

Weighted-
Average
Remaining
Contractual
Term
(Years)

Aggregate
Intrinsic
Value of
Outstanding
Options
(in thousands)

51,514     
4,887,187     
(4,074,939)    
254,034     
1,117,796     

326,023    $

102.56     

7.45    $

11 

4,074,939     
(254,034)    
4,146,928    $

466,879    $

12.88     
20.73     
19.45   

65.48     

8.84    $

3.90    $

12,227 

555 

3,594,690    $

20.57   

8.71    $

10,084

The weighted-average grant date fair values of options granted during the years ended December 31, 2020, 2019 and 2018 was $8.81, $50.40 and
$70.00 per share. There were no options exercised for the year ended December 31, 2020. The aggregate intrinsic value of options exercised was
$0.1 million and $0.2 million for the years ended December 31, 2019 and 2018. The total grant date fair value of options vested for the years ended
December 31, 2020, 2019 and 2018 was $5.2 million, $6.0 million and $5.9 million.

In May 2020, the Company entered into a separation agreement with Dr. Glover, the Company’s former President and Chief Executive Officer, in
connection with his resignation. Pursuant to the separation agreement, Dr. Glover’s unvested options that would have vested during the one-year
period from the date of separation accelerated and vested immediately. The vesting date of all remaining unvested options accelerated by one year,
and vested in accordance with the accelerated vesting schedule through December 31, 2020. All unvested options were cancelled on December 31,
2020. Furthermore, Dr. Glover received an extension of the expiration date of his vested stock options to 75 days following the Company’s
announcement of the top-line data results from its MOMENTUM clinical trial. Compensation costs relating to the vesting acceleration and the
modifications to option terms was $2.2 million for the year ended December 31, 2020.

In August 2020, the Company granted executives and employees 1,107,250 stock options with performance-based conditions. Vesting is achieved
based upon the satisfaction of pre-determined milestones. As of December 31, 2020, all of the performance-based options remain unvested. For the
year ended December 31, 2020, the Company has recognized approximately $0.9 million in stock-based compensation expense relating to certain
performance-based criteria that are considered probable of occurring.

As of December 31, 2020, total unrecognized stock-based compensation related to unvested stock options was $23.1 million, which the Company
expects to recognize over a remaining weighted-average period of 3.1 years. In addition, as of December 31, 2020, total unrecognized stock-based
compensation related to unvested stock options with performance-based conditions was $8.9 million.

120

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
      
      
      
  
   
      
  
   
      
  
   
   
      
   
      
 
 
2015 Employee Stock Purchase Plan

The Company adopted the 2015 Employee Stock Purchase Plan (ESPP) and initially reserved 17,500 shares of common stock as of its effective
date of July 15, 2015. The aggregate number of shares issued over the term of the 2015 Employee Stock Purchase Plan will not exceed 85,000
shares of common stock. The ESPP will not become effective until such time as the Compensation Committee determines in the future, and as of
December 31, 2020, the initial offering periods had not commenced. As of December 31, 2020, no shares of common stock have been issued to
employees participating in the ESPP and 17,500 shares were available for issuance under the ESPP.

13.

Income Taxes

The geographical breakdown of loss before provision for income taxes is as follows:

United States
International

Loss before provision for (benefit from) income
   taxes, net

2020

Year Ended December 31,
2019
(in thousands)

2018

(81,670)   $
910     

(89,459)   $
1,024     

(54,395)
758 

(80,760)   $

(88,435)   $

(53,637)

  $
  $

  $

The components of the provision for (benefit from) income taxes are as follows:

Current tax provision (benefit):

Federal
State
Foreign

Total current tax provision (benefit)

Deferred tax provision (benefit):

Foreign

Total deferred tax provision (benefit)
Total provision for (benefit from)
   income taxes

2020

Year Ended December 31,
2019
(in thousands)

2018

  $

  $

  $

  $

—    $
—     
59     
59    $

83     
83    $

—    $
—     
85     
85    $

(245)    
(245)   $

142    $

(160)   $

— 
— 
(180)
(180)

(122)
(122)

(302)

The reconciliation between income taxes computed at the federal statutory income tax rate and the provision for (benefit from) income taxes is as
follows:

Federal statutory rate
Effect of:

Change in valuation allowance
Federal tax credit
Warrant issuance and remeasurement
Effect of ownership change on deferred tax assets
State income tax benefit, net of federal benefit
Other permanent items

Total provision for (benefit from) income
   taxes%

121

2020

Year Ended December 31,
2019

2018

21.0%    

21.0%    

21.0%

(23.6)
5.8 
(4.2)
1.3 
0.2 
(0.7)

12.4 
1.5 
(5.3)    
(29.0)    
0.2 
(0.6)    

(22.2)
2.4 
— 
— 
0.3 
(1.0)

(0.2)%    

0.2%    

0.5%

 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
   
      
      
  
   
   
   
      
      
  
   
 
 
 
 
 
 
 
 
 
 
 
 
   
   
  
   
  
   
  
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
 
The components of the deferred tax assets are as follows:

Deferred tax assets:

Net operating loss carryforwards
Stock based compensation
59 (e) expenditures and amortization
Federal R&D and orphan drug credits
License fee
Other

Gross deferred tax assets

Valuation allowance

Total deferred tax assets

Deferred tax liabilities:

Lease Asset
Other

Total deferred tax liabilities

Total net deferred tax assets

December 31,

2020

2019

(in thousands)

14,011    $
6,459   
6,222   
5,107   
3,224   
1,024   
36,047   
(35,513)  
534   

114   
73   
187   
347    $

2,649 
4,663 
5,902 
486 
2,538 
967 
17,205 
(16,441)
764 

244 
90 
334 
430

  $

  $

Recognition of deferred tax assets is appropriate when realization of these assets is more likely than not. Based upon the weight of available
evidence, which includes historical operating performance and the recorded cumulative net losses in prior fiscal periods, the Company recorded a
full valuation allowance of $35.2 million and $16.4 million against the net U.S. deferred tax assets as of December 31, 2020 and 2019. The U.S.
net valuation allowance increased by $18.8 million for the year ended December 31, 2020. The U.S. net valuation allowance decreased by $10.9
million for the year ended December 31, 2019.

Management assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to use the
existing U.S. deferred tax assets. Based on the weight of all evidence, including a history of operating losses and the Company’s ability to generate
future taxable income to realize the assets, management has determined that it is more likely than not that the U.S. deferred tax assets will not be
realized.

Utilization of the Company’s net operating loss and U.S. research and development credit carryforwards to offset taxable income are subject to an
annual limitation, pursuant to Internal Revenue Code (IRC) Sections 382 and 383. As a result of ownership changes that have occurred, the most
recent which occurred during 2019, certain of the Company’s tax attributes existing as of the date of the ownership change are not be available for
future use. The loss of these attributes did not have any impact on the financial statements since the net U.S. deferred tax assets are offset by a full
valuation allowance.

As of December 31, 2020, the Company had gross U.S. federal tax net operating loss carryforwards of $54.8 million, that are eligible for an
indefinite carryforward, and gross state operating loss carryforwards of $52.4 million expiring in years ranging from 2022 to 2040. The Company
also has U.S. net tax credit carryforwards of $4.6 million which begin to expire in 2039 and net tax credit carryforwards in a foreign jurisdiction of
$0.5 million which begin to expire in 2038.

122

 
 
 
 
 
   
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
Uncertain Tax Positions

The activity related to the gross amount of unrecognized tax benefits is as follows:

Beginning balance

Increases based on tax positions related to prior
   years
Decreases based on tax positions related to prior
   years
Decreases due to ownership change
Increases based on tax positions in current year
Settlement
Lapse of statute of limitations

Ending balance

  $

2020

Year Ended December 31,
2019
(in thousands)

2018

  $

314    $

264    $

—     

—     

(54)    
(207)    
568     
—     
—     
621    $

(103)    
—     
153     
—     
—     
314    $

43 

109 

— 
— 
112 
— 
— 
264

If recognized, gross unrecognized tax benefits would not have a material impact on the Company’s effective tax rate due to the Company’s full
valuation allowance position on the U.S. deferred tax assets. From time to time, the Company is subject to review by tax authorities. It is not
possible to estimate the impact of changes, if any, to previously recorded uncertain tax positions. However, the Company does not expect the
changes, if any, to be materially different from what is recorded and will adjust its estimate and liability as necessary.

The Company recognizes interest and penalties related to unrecognized tax benefits in the provision for income taxes in the accompanying
consolidated statement of operations. Accrued interest and penalties, if applicable, are included in accrued liabilities in the consolidated balance
sheet. For the years ended December 31, 2020 and 2019, the Company did not recognize any accrued interest and penalties.

The Company is subject to taxation in the United States, various states, Canada and Australia. Tax years 2017 through 2019 remain open to
examination by the United States, various state jurisdictions and Canada. The tax year ended December 31, 2019 remains open to examination in
Australia. The Company is not under examination in any tax jurisdiction for any year.

14.

Selected Quarterly Financial Data (Unaudited)

The following tables present certain selected unaudited consolidated quarterly financial information for each of the eight quarters ended
December 31, 2020. This consolidated quarterly information has been prepared on the same basis as the consolidated financial statements and
includes all adjustments necessary to state fairly the information for the periods presented. The selected consolidated quarterly financial results
from operations for the years ended December 31, 2020 and 2019 are set forth therein.

March 31,
2020 (2)

June 30,
2020

September 30,
2020

December 31,
2020

Fiscal 2020 Quarter Ended

Collaboration revenue
Operating expenses
Net loss (1)
Basic and diluted net loss per share

Operating expenses
Net loss (1)
Basic and diluted net loss per share

  $
  $
  $
  $

  $
  $
  $

—    $
16,135    $
(31,912)   $
(3.14)   $

(in thousands, except per share amounts)
—    $
16,449    $
(16,462)   $
(1.58)   $

100    $
14,544    $
(14,505)   $
(1.39)   $

200 
18,113 
(18,023)
(1.63)

Fiscal 2019 Quarter Ended

March 31,
2019

June 30,
2019

September 30,
2019

December 31,
2019 (2)

(in thousands, except per share amounts)

13,502    $
(13,032)   $
(7.00)   $

15,207    $
(14,878)   $
(7.97)   $

13,264    $
(12,903)   $
(6.91)   $

25,019 
(47,462)
(7.88)

123

 
 
 
 
 
   
   
 
 
 
 
   
   
   
   
   
   
 
 
 
 
 
 
 
 
   
   
   
 
 
 
 
 
 
 
 
 
 
   
   
   
 
 
 
 
(1) Net loss from continuing operations and net loss attributable to holders of common stock and preferred stock with characteristics of common

stock are the same as net loss for all periods presented.

(2) Net loss for the quarters ended March 31, 2020 and December 31, 2019 included a $16.2 million and $20.9 million non-cash charge,

respectively, relating to changes in fair value of warrant liabilities (see Note 11) and a $1.5 million and $10.5 million non-cash charge,
respectively, relating to the Company’s obligation to issue securities pursuant to an amendment to the Asset Purchase Agreement with Gilead
(see Note 8).

124

 
 
 
 
Item  9.

Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item  9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

As of December 31, 2020, our management, with the participation of our Chief Executive Officer and Chief Financial Officer, performed an evaluation of
the effectiveness of the design and operation of our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act.
Our disclosure controls and procedures are designed to ensure that information required to be disclosed in the reports we file or submit under the Exchange
Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, and
that such information is accumulated and communicated to our management, including the Chief Executive Officer and the Chief Financial Officer, to
allow timely decisions regarding required disclosures. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as
of December 31, 2020, the design and operation of our disclosure controls and procedures were effective at a reasonable assurance level.

Any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objective
and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rules 13a-
15(f) and 15d-15(f) of the Exchange Act. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability
of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting
principles. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any
evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree
of compliance with the policies or procedures may deteriorate.

As of December 31, 2020, management assessed the effectiveness of our internal control over financial reporting based on the framework established in
“Internal Control—Integrated Framework” issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) (2013
Framework). Based on this evaluation, management has determined that our internal control over financial reporting was effective as of December 31,
2020.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting identified in connection with the evaluation required by Rule 13a-15(d) and 15d-
15(d) of the Exchange Act that occurred during the quarter ended December 31, 2020 that have materially affected, or are reasonably likely to materially
affect, our internal control over financial reporting.

Item  9B. Other Information.

None.

125

 
Item  10. Directors, Executive Officers and Corporate Governance.

PART III

The information required by this item is incorporated herein by reference to our Proxy Statement with respect to our 2021 Annual Meeting of Stockholders
to be filed with the SEC within 120 days of the end of the fiscal year covered by this Annual Report on Form 10-K.

Item  11. Executive Compensation.

The information required by this item is incorporated herein by reference to our Proxy Statement with respect to our 2021 Annual Meeting of Stockholders
to be filed with the SEC within 120 days of the end of the fiscal year covered by this Annual Report on Form 10-K.

Item  12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The information required by this item is incorporated herein by reference to our Proxy Statement with respect to our 2021 Annual Meeting of Stockholders
to be filed with the SEC within 120 days of the end of the fiscal year covered by this Annual Report on Form 10-K.

Item  13. Certain Relationships and Related Transactions, and Director Independence.

The information required by this item is incorporated herein by reference to our Proxy Statement with respect to our 2021 Annual Meeting of Stockholders
to be filed with the SEC within 120 days of the end of the fiscal year covered by this Annual Report on Form 10-K.

Item  14. Principal Accounting Fees and Services.

The information required by this item is incorporated herein by reference to our Proxy Statement with respect to our 2021 Annual Meeting of Stockholders
to be filed with the SEC within 120 days of the end of the fiscal year covered by this Annual Report on Form 10-K.

126

 
PART IV

Item  15. Exhibits, Consolidated Financial Statement Schedules.

(a) The following documents are filed as part of this report:

1. Consolidated Financial Statements

See Index to Consolidated Financial Statements at Item 8 herein.

2. Consolidated Financial Statement Schedules

No consolidated financial statement schedules are provided because the information called for is not required or is shown either in the
consolidated financial statements or notes thereto.

3. Exhibits

Exhibit
Number

   2.1+†

   2.2++

   3.1

   3.2

   3.3

   3.4

   4.1

   4.2

Description of Document

Asset Purchase Agreement dated August 20,
2018 by and between the Registrant and YM
Biosciences Australia Pty Ltd. and Gilead
Sciences, Inc.

Amendment to Asset Purchase Agreement
dated October 28, 2019, by and between the
Registrant and YM Biosciences Australia Pty
Ltd. and Gilead Sciences, Inc.

Restated Certificate of Incorporation.

Certificate of Amendment to the Restated
Certificate of Incorporation.

Amended and Restated Bylaws.

Certificate of Designation of Preferences,
Rights and Limitations, with respect to the
Series A Convertible Voting Preferred Stock.

Form of Common Stock Certificate.

Third Amended and Restated Investor Rights
Agreement, dated April 17, 2014, by and
among the Registrant and certain of its
stockholders, as amended.

Incorporated by reference

File No.

Exhibit

Filing Date

Filed
Herewith

001-37490

2.1

November 8, 2018

Form

10-Q

10-K

001-37490

2.2

March 3, 2020

S-1

8-K

8-K

8-K

S-1

S-1

333-204921

001-37490

001-37490

001-37490

333-204921

333-204921

3.2

3.1

3.1

3.1

4.1

4.2

June 12, 2015

January 22, 2020

April 16, 2020

November 13, 2019

July 6, 2015

June 12, 2015

127

 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
Exhibit
Number
   4.3

   4.4

   4.5

   4.6

   4.7

   4.8

   4.9

   4.10

  10.1*

  10.2*

  10.3*

  10.4*

  10.5*

  10.6*

  10.7

  10.8*

  10.9*

  10.10*

Description of Document

Warrant dated August 21, 2018 issued to
Silicon Valley Bank

Form of Series A Preferred Stock Certificate

Description of Securities

Form of Series A Convertible Voting Preferred
Stock Certificate

Form of Series A Warrant

Form of Series B Warrant

Securities Purchase Agreement by and
between the Company and Gilead Sciences,
Inc.

Form of Warrant to Gilead Sciences, Inc.

Form of Indemnification Agreement.

2008 Stock Plan, as amended, and forms of
award agreements thereunder.

2015 Equity Incentive Plan, as amended, and
forms of award agreements thereunder.

Form
10-Q

8-K

10-K

8-K

8-K

8-K

8-K

8-K

S-1

S-1

Incorporated by reference

File No.
001-37490

001-37490

001-37490

001-37490

001-37490

001-37490

001-37490

Exhibit
4.1

Filing Date
November 8, 2018

Filed
Herewith

4.1

4.5

3.1

4.1

4.2

November 13, 2019

March 3, 2020

November 13, 2019

November 7, 2019

November 7, 2019

10.1

February 6, 2020

001-37490

333-204921

333-204921

10.2

10.1

10.2

February 6, 2020

June 12, 2015

June 12, 2015

X

X

2015 Employee Stock Purchase Plan.

S-1

333-204921

10.4

July 6, 2015

2018 Equity Inducement Plan, as amended,
and forms of award agreements thereunder.

Form of Executive Officer Employment
Agreement.

Form of Amendment to Executive Officer
Employment Agreement (other than Chief
Executive Officer)

Employment Agreement between the
Registrant and Stephen G. Dilly

Separation Agreement dated May 28, 2020
between the Registrant and Nick Glover.

Employment Agreement between the
Registrant and Nick Glover.

S-1

333-204921

10-Q

001-37490

10-Q

001-37490

10-Q

001-37490

S-1

333-204921

128

10.5

10.1

10.1

10.2

10.7

July 6, 2015

May 9, 2017

August 6, 2020

August 6, 2020

July 6, 2015

 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
  10.11+

  10.12+

  10.13

  10.14

  10.15

  21.1

  23.1

  24.1

  31.1

  31.2

Description of Document

License Agreement dated September 27, 2016
by and between the Registrant and CRT
Pioneer Fund LP.

Amendment No. 1 to the License Agreement
dated November 10, 2020 by and between the
Registrant and CRT Pioneer Fund LP.

Office Lease, dated June 12, 2017, by and
between Sierra Oncology Canada ULC and
The Cadillac Fairview Corporation Limited, as
the duly authorized agent of Ontrea Inc. and
Van885 West Georgia GP Ltd., the general
partner of Van885 West Georgia LP.

Office Sublease, dated December 1, 2020, by
and between Sierra Oncology Canada ULC
and Scougall Management (1987) Limited and
consented to on December 18, 2020 by
Van885 West Georgia GP Ltd. and Ontrea
Inc., the general partners of Van885 West
Georgia LP.

Office Lease, dated December 10, 2020 and
effective December 14, 2020, by and between
Sierra Oncology, Inc. and KW Fund VI-San
Mateo, LLC.

Subsidiaries of the Registrant.

Consent of independent registered public
accounting firm.

Power of Attorney. Reference is made to the
signature page hereto.

Certification of Principal Executive Officer,
pursuant to Rule 13a-14(a)/15d-14(a), as
adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.

Certification of Principal Financial Officer,
pursuant to Rule 13a-14(a)/15d-14(a), as
adopted pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.

Incorporated by reference

Form
10-Q

File No.
001-37490

Exhibit
10.1

Filing Date
November 10, 2016

Filed
Herewith

10-Q

001-37490

10.1

August 10, 2017

129

X

X

X

X

X

X

X

X

 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
  32.1**

  32.2**

Description of Document

Form

File No.

Exhibit

Filing Date

Incorporated by reference

Certification of Chief Executive Officer,
pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002.

Certification of Chief Financial Officer,
pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002.

101.INS

XBRL Instance Document.

101.SCH

XBRL Schema Linkbase Document.

101.CAL

XBRL Calculation Linkbase Document.

101.DEF

XBRL Definition Linkbase Document.

101.EXT

XBRL Extension label Linkbase Document.

101.PRE

XBRL Presentation Linkbase Document.

Filed
Herewith
X

X

X

X

X

X

X

X

*
**

+

++
†

Executive compensation plan or agreement.
This certification is deemed not filed for purposes of Section 18 of the Exchange Act or otherwise subject to the liability of that section, nor shall it
be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act.
Confidential treatment has been granted for portions of this exhibit under Rule 24b-2 promulgated under the Exchange Act. The Registrant has
omitted and filed separately with the SEC the confidential portions of this exhibit.
Registrant has omitted portions of the exhibit as permitted under Item 601(b)(10) of Regulation S-K.
Schedules and similar attachments to the agreement have been omitted pursuant to Item 601(b)(2) of Regulation S-K. The Company will furnish
supplementally a copy of any omitted schedule or similar attachment to the SEC upon request.

 Item 16. Form 10-K Summary.

None.

130

 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Report to be
signed on its behalf by the undersigned, thereunto duly authorized.

Date: March 11, 2021

SIGNATURES

SIERRA ONCOLOGY, INC.

By:

/s/ Stephen G. Dilly
Stephen G. Dilly
President and Chief Executive Officer

POWER OF ATTORNEY

Each person whose individual signature appears below hereby authorizes and appoints Stephen Dilly and Sukhi Jagpal, and each of them, with full power
of substitution and resubstitution and full power to act without the other, as his or her true and lawful attorney-in-fact and agent to act in his or her name,
place and stead and to execute in the name and on behalf of each person, individually and in each capacity stated below, and to file any and all amendments
to this annual report on Form 10-K and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act
and thing, ratifying and confirming all that said attorneys-in-fact and agents or any of them or their or his substitute or substitutes may lawfully do or cause
to be done by virtue thereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Report has been signed below by the following persons on behalf of
the Registrant in the capacities and on the dates indicated.

Signature

Title

Date

/s/ Stephen G. Dilly

Stephen G. Dilly
/s/ Sukhi Jagpal

Sukhi Jagpal
/s/ Robert Pelzer

Robert Pelzer
/s/ Gaurav Aggarwal

Gaurav Aggarwal
/s/ Andrew Allen

Andrew Allen
/s/ Mona Ashiya

Mona Ashiya
/s/ Craig Collard

Craig Collard
/s/ Jeffrey H. Cooper

Jeffrey H. Cooper
/s/ Josh Richardson

Josh Richardson
/s/ Andrew Sinclair

Andrew Sinclair

President, Chief Executive Officer and
Director (Principal Executive Officer)

Chief Financial Officer (Principal
Accounting and Financial Officer)

March 11, 2021

March 11, 2021

Chairman of the Board

March 11, 2021

Director

Director

Director

Director

Director

Director

Director

131

March 11, 2021

March 11, 2021

March 11, 2021

March 11, 2021

March 11, 2021

March 11, 2021

March 11, 2021

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
SIERRA ONCOLOGY, INC.

2015 EQUITY INCENTIVE PLAN

As amended on January 21, 2020

Exhibit 10.3

1. PURPOSE. The purpose of this Plan is to provide incentives to attract, retain and motivate eligible persons whose present and potential contributions
are important to the success of the Company, and any Parents and Subsidiaries that exist now or in the future, by offering them an opportunity to participate
in the Company’s future performance through the grant of Awards. Capitalized terms not defined elsewhere in the text are defined in Section 28.

2. SHARES SUBJECT TO THE PLAN.

2.1. Number of Shares Available. Subject to Sections 2.6 and 21 and any other applicable provisions hereof, the total number of Shares reserved and
available for grant and issuance pursuant to this Plan as of the Amendment Effective Date (as defined below) is four million three hundred twelve thousand
five hundred (4,312,500) Shares, plus (a) any reserved shares not issued or subject to outstanding grants under the Plan as of immediately prior to the
Amendment Effective Date, (b) shares that are subject to stock options or other awards granted under the Company’s 2008 Stock Plan (the “Prior Plan”)
on the Amendment Effective Date that cease to be subject to such stock options or other awards by forfeiture or otherwise after the Amendment Effective
Date, (c) shares issued under the Prior Plan before or after the Amendment Effective Date pursuant to the exercise of stock options that are, after the
Amendment Effective Date, forfeited, (d) shares issued under the Prior Plan that are repurchased by the Company at the original issue price and (e) shares
that are subject to stock options or other awards under the Prior Plan that are used to pay the exercise price of an option or withheld to satisfy the tax
withholding obligations related to any award.

2.2. Lapsed, Returned Awards. Shares subject to Awards, and Shares issued under the Plan under any Award, will again be available for grant and

issuance in connection with subsequent Awards under this Plan to the extent such Shares: (a) are subject to issuance upon exercise of an Option or SAR
granted under this Plan but which cease to be subject to the Option or SAR for any reason other than exercise of the Option or SAR; (b) are subject to
Awards granted under this Plan that are forfeited or are repurchased by the Company at the original issue price; (c) are subject to Awards granted under this
Plan that otherwise terminate without such Shares being issued; or (d) are surrendered pursuant to an Exchange Program. To the extent an Award under the
Plan is paid out in cash rather than Shares, such cash payment will not result in reducing the number of Shares available for issuance under the Plan. Shares
used to pay the exercise price of an Award or withheld to satisfy the tax withholding obligations related to an Award will become available for future grant
or sale under the Plan. For the avoidance of doubt, Shares that otherwise become available for grant and issuance because of the provisions of this
Section 2.2 shall not include Shares subject to Awards that initially became available because of the substitution clause in Section 21.2 hereof.

2.3. Minimum Share Reserve. At all times the Company shall reserve and keep available a sufficient number of Shares as shall be required to satisfy

the requirements of all outstanding Awards granted under this Plan.

2.4. Automatic Share Reserve Increase. The number of Shares available for grant and issuance under the Plan shall be increased on January 1, of

each of the calendar years 2016 through 2025, by the lesser of (a) four (4%) of the number of Shares issued and outstanding on each December 31
immediately prior to the date of increase or (b) such number of Shares determined by the Board.

2.5. Limitations. No more than twelve million five hundred thousand (12,500,000) Shares shall be issued pursuant to the exercise of ISOs.

2.6. Adjustment of Shares. If the number of outstanding Shares is changed by a stock dividend, extraordinary dividends or distributions (whether in
cash, shares or other property, other than a regular cash dividend) recapitalization, stock split, reverse stock split, subdivision, combination, reclassification,
spin-off or similar change in the capital structure of the Company, without consideration, then (a) the number of Shares reserved for issuance and future
grant under the Plan set forth in Section 2.1, including shares reserved under sub-clauses (a)-(e) of Section 2.1, (b) the Exercise Prices of and number of
Shares subject to outstanding Options and SARs, (c) the number of Shares subject to other outstanding Awards, and (d) the maximum number of shares that
may be issued as ISOs set forth in Section 2.5 shall be proportionately adjusted, subject to any required action by the Board or the stockholders of the
Company and in compliance with applicable securities laws; provided that fractions of a Share will not be issued.

 
 
3. ELIGIBILITY. ISOs may be granted only to Employees. All other Awards may be granted to Employees, Consultants, Directors and Non-Employee
Directors; provided such Consultants, Directors and Non-Employee Directors render bona fide services not in connection with the offer and sale of
securities in a capital-raising transaction.

4. ADMINISTRATION.

4.1. Committee Composition; Authority. This Plan will be administered by the Committee or by the Board acting as the Committee. Subject to the
general purposes, terms and conditions of this Plan, and to the direction of the Board, the Committee will have full power to implement and carry out this
Plan, except, however, the Board shall establish the terms for the grant of an Award to Non-Employee Directors. The Committee will have the authority to:

(a) construe and interpret this Plan, any Award Agreement and any other agreement or document executed pursuant to this Plan;

(b) prescribe, amend and rescind rules and regulations relating to this Plan or any Award;

(c) select persons to receive Awards;

(d) determine the form and terms and conditions, not inconsistent with the terms of the Plan, of any Award granted hereunder. Such terms

and conditions include, but are not limited to, the exercise price, the time or times when Awards may vest and be exercised (which may be based on
performance criteria) or settled, any vesting acceleration or waiver of forfeiture restrictions, the method to satisfy tax withholding obligations or any other
tax liability legally due and any restriction or limitation regarding any Award or the Shares relating thereto, based in each case on such factors as the
Committee will determine;

(e) determine the number of Shares or other consideration subject to Awards;

(f) determine the Fair Market Value in good faith and interpret the applicable provisions of this Plan and the definition of Fair Market Value

in connection with circumstances that impact the Fair Market Value, if necessary;

(g) determine whether Awards will be granted singly, in combination with, in tandem with, in replacement of, or as alternatives to, other

Awards under this Plan or any other incentive or compensation plan of the Company or any Parent or Subsidiary of the Company;

(h) grant waivers of Plan or Award conditions;

(i) determine the vesting, exercisability and payment of Awards;

(j) correct any defect, supply any omission or reconcile any inconsistency in this Plan, any Award or any Award Agreement;

(k) determine whether an Award has been earned;

(l) determine the terms and conditions of any, and to institute any Exchange Program;

(m) reduce or waive any criteria with respect to Performance Factors;

(n) adjust Performance Factors to take into account changes in law and accounting or tax rules as the Committee deems necessary or

appropriate to reflect the impact of extraordinary or unusual items, events or circumstances to avoid windfalls or hardships;

(o) adopt terms and conditions, rules and/or procedures (including the adoption of any subplan under this Plan) relating to the operation and

administration of the Plan to accommodate requirements of local law and procedures outside of the United States;

(p) make all other determinations necessary or advisable for the administration of this Plan; and

(q) delegate any of the foregoing to a subcommittee consisting of one or more executive officers pursuant to a specific delegation as

permitted by applicable law, including Section 157(c) of the Delaware General Corporation Law.

4.2. Committee Interpretation and Discretion. Any determination made by the Committee with respect to any Award shall be made in its sole
discretion at the time of grant of the Award or, unless in contravention of any express term of the Plan or Award, at any later time, and such determination
shall be final and binding on the Company and all persons having an interest in any Award under the Plan. Any dispute regarding the interpretation of the
Plan or any Award Agreement shall be submitted by the Participant or Company to the Committee for review. The resolution of such a dispute by the
Committee shall be final and binding on the Company and the Participant. The Committee may delegate to one or more executive

 
 
officers the authority to review and resolve disputes with respect to Awards held by Participants who are not Insiders, and such resolution shall be final and
binding on the Company and the Participant.

4.3. Section 162(m) of the Code and Section 16 of the Exchange Act. When necessary or desirable for an Award to qualify as “performance-based

compensation” under Section 162(m) of the Code the Committee shall include at least two persons who are “outside directors” (as defined under
Section 162(m) of the Code) and at least two (or a majority if more than two then serve on the Committee) such “outside directors” shall approve the grant
of such Award and timely determine (as applicable) the Performance Period and any Performance Factors upon which vesting or settlement of any portion
of such Award is to be subject. When required by Section 162(m) of the Code, prior to settlement of any such Award at least two (or a majority if more than
two then serve on the Committee) such “outside directors” then serving on the Committee shall determine and certify in writing the extent to which such
Performance Factors have been timely achieved and the extent to which the Shares subject to such Award have thereby been earned. Awards granted to
Participants who are subject to Section 16 of the Exchange Act must be approved by two or more “non-employee directors” (as defined in the regulations
promulgated under Section 16 of the Exchange Act). With respect to Participants whose compensation is subject to Section 162(m) of the Code, and
provided that such adjustments are consistent with the regulations promulgated under Section 162(m) of the Code, the Committee may adjust the
performance goals to account for changes in law and accounting and to make such adjustments as the Committee deems necessary or appropriate to reflect
the impact of extraordinary or unusual items, events or circumstances to avoid windfalls or hardships, including without limitation (a) restructurings,
discontinued operations, extraordinary items, and other unusual or non-recurring charges, (b) an event either not directly related to the operations of the
Company or not within the reasonable control of the Company’s management, or (c) a change in accounting standards required by generally accepted
accounting principles.

4.4. Documentation. The Award Agreement for a given Award, the Plan and any other documents may be delivered to, and accepted by, a

Participant or any other person in any manner (including electronic distribution or posting) that meets applicable legal requirements.

4.5. Foreign Award Recipients. Notwithstanding any provision of the Plan to the contrary, in order to comply with the laws and practices in other

countries in which the Company and its Subsidiaries operate or have employees or other individuals eligible for Awards, the Committee, in its sole
discretion, shall have the power and authority to: (a) determine which Subsidiaries and Affiliates shall be covered by the Plan; (b) determine which
individuals outside the United States are eligible to participate in the Plan, which may include individuals who provide services to the Company, Subsidiary
or Affiliate under an agreement with a foreign nation or agency; (c) modify the terms and conditions of any Award granted to individuals outside the United
States or foreign nationals to comply with applicable foreign laws, policies, customs and practices; (d) establish subplans and modify exercise procedures
and other terms and procedures, to the extent the Committee determines such actions to be necessary or advisable (and such subplans and/or modifications
shall be attached to this Plan as appendices); provided, however, that no such subplans and/or modifications shall increase the share limitations contained in
Section 2.1 hereof; and (e) take any action, before or after an Award is made, that the Committee determines to be necessary or advisable to obtain approval
or comply with any local governmental regulatory exemptions or approvals. Notwithstanding the foregoing, the Committee may not take any actions
hereunder, and no Awards shall be granted, that would violate the Exchange Act or any other applicable United States securities law, the Code, or any other
applicable United States governing statute or law.

5. OPTIONS. An Option is the right but not the obligation to purchase a Share, subject to certain conditions, if applicable. The Committee may grant
Options to eligible Employees, Consultants and Directors and will determine whether such Options will be Incentive Stock Options within the meaning of
the Code (“ISOs”) or Nonqualified Stock Options (“NSOs”), the number of Shares subject to the Option, the Exercise Price of the Option, the period
during which the Option may vest and be exercised, and all other terms and conditions of the Option, subject to the following terms of this section.

5.1. Option Grant. Each Option granted under this Plan will identify the Option as an ISO or an NSO. An Option may be, but need not be, awarded
upon satisfaction of such Performance Factors during any Performance Period as are set out in advance in the Participant’s individual Award Agreement. If
the Option is being earned upon the satisfaction of Performance Factors, then the Committee will: (a) determine the nature, length and starting date of any
Performance Period for each Option; and (b) select from among the Performance Factors to be used to measure the performance, if any. Performance
Periods may overlap and Participants may participate simultaneously with respect to Options that are subject to different performance goals and other
criteria.

5.2. Date of Grant. The date of grant of an Option will be the date on which the Committee makes the determination to grant such Option, or a

specified future date. The Award Agreement and a copy of this Plan will be delivered to the Participant within a reasonable time after the granting of the
Option.

 
 
5.3. Exercise Period. Options may be vested and exercisable within the times or upon the conditions as set forth in the Award Agreement governing
such Option; provided, however, that no Option will be exercisable after the expiration of ten (10) years from the date the Option is granted; and provided
further that no ISO granted to a person who, at the time the ISO is granted, directly or by attribution owns more than ten percent (10%) of the total
combined voting power of all classes of stock of the Company or of any Parent or Subsidiary of the Company (“Ten Percent Stockholder”) will be
exercisable after the expiration of five (5) years from the date the ISO is granted. The Committee also may provide for Options to become exercisable at
one time or from time to time, periodically or otherwise, in such number of Shares or percentage of Shares as the Committee determines.

5.4. Exercise Price. The Exercise Price of an Option will be determined by the Committee when the Option is granted; provided that: (a) the
Exercise Price of an Option will be not less than one hundred percent (100%) of the Fair Market Value of the Shares on the date of grant and (b) the
Exercise Price of any ISO granted to a Ten Percent Stockholder will not be less than one hundred ten percent (110%) of the Fair Market Value of the Shares
on the date of grant. Payment for the Shares purchased may be made in accordance with Section 11 and the Award Agreement and in accordance with any
procedures established by the Company.

5.5. Method of Exercise. Any Option granted hereunder will be vested and exercisable according to the terms of the Plan and at such times and
under such conditions as determined by the Committee and set forth in the Award Agreement. An Option may not be exercised for a fraction of a Share. An
Option will be deemed exercised when the Company receives: (a) notice of exercise (in such form as the Committee may specify from time to time) from
the person entitled to exercise the Option (and/or via electronic execution through the authorized third-party administrator), and (b) full payment for the
Shares with respect to which the Option is exercised (together with applicable withholding taxes). Full payment may consist of any consideration and
method of payment authorized by the Committee and permitted by the Award Agreement and the Plan. Shares issued upon exercise of an Option will be
issued in the name of the Participant. Until the Shares are issued (as evidenced by the appropriate entry on the books of the Company or of a duly
authorized transfer agent of the Company), no right to vote or receive dividends or any other rights as a stockholder will exist with respect to the Shares,
notwithstanding the exercise of the Option. The Company will issue (or cause to be issued) such Shares promptly after the Option is exercised. No
adjustment will be made for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Section 2.6
of the Plan. Exercising an Option in any manner will decrease the number of Shares thereafter available, both for purposes of the Plan and for sale under
the Option, by the number of Shares as to which the Option is exercised.

5.6. Termination of Service. If the Participant’s Service terminates for any reason except for Cause or the Participant’s death or Disability, then the
Participant may exercise such Participant’s Options (only to the extent that such Options are exercisable by the Participant on the date Participant’s Service
terminates) during the period ending no later than three (3) months after the date Participant’s Service terminates (or such shorter or longer time period as
may be determined by the Committee, with any exercise beyond three (3) months after the date Participant’s Service terminates deemed to be the exercise
of an NSO), but in any event no later than the expiration date of the Options.

(a) Death. If the Participant’s Service terminates because of the Participant’s death (or the Participant dies within three (3) months after

Participant’s Service terminates other than for Cause or because of the Participant’s Disability), then the Participant’s Options may be exercised only to the
extent that such Options would have been exercisable by the Participant on the date Participant’s Service terminates and must be exercised by the
Participant’s legal representative, or authorized assignee, no later than twelve (12) months after the date Participant’s Service terminates (or such shorter
time period or longer time period as may be determined by the Committee), but in any event no later than the expiration date of the Options.

(b) Disability. If the Participant’s Service terminates because of the Participant’s Disability, then the Participant’s Options may be exercised

only to the extent that such Options would have been exercisable by the Participant on the date Participant’s Service terminates and must be exercised by
the Participant (or the Participant’s legal representative or authorized assignee) no later than twelve (12) months after the date Participant’s Service
terminates (or such shorter or longer time period as may be determined by the Committee, with any exercise beyond (a) three (3) months after the date
Participant’s Service terminates when the termination of Service is for a Disability that is not a “permanent and total disability” as defined in Section 22(e)
(3) of the Code, or (b) twelve (12) months after the date Participant’s Service terminates when the termination of Service is for a Disability that is a
“permanent and total disability” as defined in Section 22(e)(3) of the Code, deemed to be exercise of an NSO), but in any event no later than the expiration
date of the Options.

(c) Cause. If the Participant is terminated for Cause, then Participant’s Options shall expire on such Participant’s date of termination of

Service, or at such later time and on such conditions as are determined by the Committee, but in any no

 
 
event later than the expiration date of the Options. Unless otherwise provided in the Award Agreement, Cause shall have the meaning set forth in the Plan.

5.7. Limitations on Exercise. The Committee may specify a minimum number of Shares that may be purchased on any exercise of an Option,

provided that such minimum number will not prevent any Participant from exercising the Option for the full number of Shares for which it is then
exercisable.

5.8. Limitations on ISOs. With respect to Awards granted as ISOs, to the extent that the aggregate Fair Market Value of the Shares with respect to

which such ISOs are exercisable for the first time by the Participant during any calendar year (under all plans of the Company and any Parent or
Subsidiary) exceeds one hundred thousand dollars ($100,000), such Options will be treated as NSOs. For purposes of this Section 5.8, ISOs will be taken
into account in the order in which they were granted. The Fair Market Value of the Shares will be determined as of the time the Option with respect to such
Shares is granted. In the event that the Code or the regulations promulgated thereunder are amended after the Effective Date to provide for a different limit
on the Fair Market Value of Shares permitted to be subject to ISOs, such different limit will be automatically incorporated herein and will apply to any
Options granted after the effective date of such amendment.

5.9. Modification, Extension or Renewal. The Committee may modify, extend or renew outstanding Options and authorize the grant of new Options

in substitution therefor, provided that any such action may not, without the written consent of a Participant, impair any of such Participant’s rights under
any Option previously granted. Any outstanding ISO that is modified, extended, renewed or otherwise altered will be treated in accordance with
Section 424(h) of the Code. Subject to Section 18 of this Plan, by written notice to affected Participants, the Committee may reduce the Exercise Price of
outstanding Options without the consent of such Participants; provided, however, that the Exercise Price may not be reduced below the Fair Market Value
on the date the action is taken to reduce the Exercise Price.

5.10. No Disqualification. Notwithstanding any other provision in this Plan, no term of this Plan relating to ISOs will be interpreted, amended or

altered, nor will any discretion or authority granted under this Plan be exercised, so as to disqualify this Plan under Section 422 of the Code or, without the
consent of the Participant affected, to disqualify any ISO under Section 422 of the Code.

6. RESTRICTED STOCK AWARDS. A Restricted Stock Award is an offer by the Company to sell to an eligible Employee, Consultant, or Director
Shares that are subject to restrictions (“Restricted Stock”). The Committee will determine to whom an offer will be made, the number of Shares the
Participant may purchase, the Purchase Price, the restrictions under which the Shares will be subject and all other terms and conditions of the Restricted
Stock Award, subject to the Plan.

6.1. Restricted Stock Purchase Agreement. All purchases under a Restricted Stock Award will be evidenced by an Award Agreement. Except as
may otherwise be provided in an Award Agreement, a Participant accepts a Restricted Stock Award by signing and delivering to the Company an Award
Agreement with full payment of the Purchase Price, within thirty (30) days from the date the Award Agreement was delivered to the Participant. If the
Participant does not accept such Award within thirty (30) days, then the offer of such Restricted Stock Award will terminate, unless the Committee
determines otherwise.

6.2. Purchase Price. The Purchase Price for a Restricted Stock Award will be determined by the Committee and may be less than Fair Market Value

on the date the Restricted Stock Award is granted. Payment of the Purchase Price must be made in accordance with Section 11 of the Plan, and the Award
Agreement and in accordance with any procedures established by the Company.

6.3. Terms of Restricted Stock Awards. Restricted Stock Awards will be subject to such restrictions as the Committee may impose or are required

by law. These restrictions may be based on completion of a specified number of years of service with the Company or upon completion of Performance
Factors, if any, during any Performance Period as set out in advance in the Participant’s Award Agreement. Prior to the grant of a Restricted Stock Award,
the Committee shall: (a) determine the nature, length and starting date of any Performance Period for the Restricted Stock Award; (b) select from among
the Performance Factors to be used to measure performance goals, if any; and (c) determine the number of Shares that may be awarded to the Participant.
Performance Periods may overlap and a Participant may participate simultaneously with respect to Restricted Stock Awards that are subject to different
Performance Periods and having different performance goals and other criteria.

6.4. Termination of Service. Except as may be set forth in the Participant’s Award Agreement, vesting ceases on such date Participant’s Service

terminates (unless determined otherwise by the Committee) and any Shares of Restricted Stock that are unvested as of such date shall be forfeited on such
date for no consideration.

 
 
7. STOCK BONUS AWARDS. A Stock Bonus Award is an award to an eligible Employee, Consultant, or Director of Shares for Services to be rendered
or for past Services already rendered to the Company or any Parent or Subsidiary. All Stock Bonus Awards shall be made pursuant to an Award Agreement.
No payment from the Participant will be required for Shares awarded pursuant to a Stock Bonus Award.

7.1. Terms of Stock Bonus Awards. The Committee will determine the number of Shares to be awarded to the Participant under a Stock Bonus

Award and any restrictions thereon. These restrictions may be based upon completion of a specified number of years of service with the Company or upon
satisfaction of performance goals based on Performance Factors during any Performance Period as set out in advance in the Participant’s Stock Bonus
Agreement. Prior to the grant of any Stock Bonus Award the Committee shall, as applicable: (a) determine the nature, length and starting date of any
Performance Period for the Stock Bonus Award; (b) select from among the Performance Factors to be used to measure performance goals; and
(c) determine the number of Shares that may be awarded to the Participant. Performance Periods may overlap and a Participant may participate
simultaneously with respect to Stock Bonus Awards that are subject to different Performance Periods and different performance goals and other criteria.

7.2. Form of Payment to Participant. Payment may be made in the form of cash, whole Shares, or a combination thereof, based on the Fair Market

Value of the Shares earned under a Stock Bonus Award on the date of payment, as determined in the sole discretion of the Committee.

7.3. Termination of Service. Except as may be set forth in the Participant’s Award Agreement, vesting ceases on such date Participant’s Service

terminates (unless determined otherwise by the Committee) and any unvested portion of the Stock Bonus Award will be forfeited for no consideration on
such date.

8. STOCK APPRECIATION RIGHTS. A Stock Appreciation Right (“SAR”) is an award to an eligible Employee, Consultant, or Director that may be
settled in cash, or Shares (which may consist of Restricted Stock), having a value equal to (a) the difference between the Fair Market Value on the date of
exercise over the Exercise Price multiplied by (b) the number of Shares with respect to which the SAR is being settled (subject to any maximum number of
Shares that may be issuable as specified in an Award Agreement). All SARs shall be made pursuant to an Award Agreement.

8.1. Terms of SARs. The Committee will determine the terms of each SAR including, without limitation: (a) the number of Shares subject to the
SAR; (b) the Exercise Price and the time or times during which the SAR may be settled; (c) the consideration to be distributed on settlement of the SAR;
and (d) the effect of the Participant’s termination of Service on each SAR. The Exercise Price of the SAR will be determined by the Committee when the
SAR is granted, and may not be less than Fair Market Value of the Shares on the date of grant. A SAR may be awarded upon satisfaction of Performance
Factors, if any, during any Performance Period as are set out in advance in the Participant’s individual Award Agreement. If the SAR is being earned upon
the satisfaction of Performance Factors, then the Committee will: (x) determine the nature, length and starting date of any Performance Period for each
SAR; and (y) select from among the Performance Factors to be used to measure the performance, if any. Performance Periods may overlap and Participants
may participate simultaneously with respect to SARs that are subject to different Performance Factors and other criteria.

8.2. Exercise Period and Expiration Date. A SAR will be exercisable within the times or upon the occurrence of events determined by the
Committee and as set forth in the Award Agreement governing such SAR. The SAR Agreement shall set forth the expiration date; provided that no SAR
will be exercisable after the expiration of ten (10) years from the date the SAR is granted. The Committee may also provide for SARs to become
exercisable at one time or from time to time, periodically or otherwise (including, without limitation, upon the attainment during a Performance Period of
performance goals based on Performance Factors), in such number of Shares or percentage of the Shares subject to the SAR as the Committee determines.
Except as may be set forth in the Participant’s Award Agreement, vesting ceases on the date Participant’s Service terminates (unless determined otherwise
by the Committee). Notwithstanding the foregoing, the rules of Section 5.6 also will apply to SARs.

8.3. Form of Settlement. Upon exercise of a SAR, a Participant will be entitled to receive payment from the Company in an amount determined by

multiplying (a) the difference between the Fair Market Value of a Share on the date of exercise over the Exercise Price; times (b) the number of Shares with
respect to which the SAR is exercised. At the discretion of the Committee, the payment from the Company for the SAR exercise may be in cash, in Shares
of equivalent value, or in some combination thereof. The portion of a SAR being settled may be paid currently or on a deferred basis with such interest or
dividend equivalent, if any, as the Committee determines, provided that the terms of the SAR and any deferral satisfy the requirements of Section 409A of
the Code.

 
 
8.4. Termination of Service. Except as may be set forth in the Participant’s Award Agreement, vesting ceases on such date Participant’s Service

terminates (unless determined otherwise by the Committee) and any SARs that remain unvested on such date shall be forfeited on such date for no
consideration.

9. RESTRICTED STOCK UNITS. A Restricted Stock Unit (“RSU”) is an award to an eligible Employee, Consultant, or Director covering a number of
Shares that may be settled in cash, or by issuance of those Shares (which may consist of Restricted Stock). All RSUs shall be made pursuant to an Award
Agreement.

9.1. Terms of RSUs. The Committee will determine the terms of an RSU including, without limitation: (a) the number of Shares subject to the RSU;

(b) the time or times during which the RSU may be settled; (c) the consideration to be distributed on settlement; and (d) the effect of the Participant’s
termination of Service on each RSU. An RSU may be awarded upon satisfaction of such performance goals based on Performance Factors during any
Performance Period as are set out in advance in the Participant’s Award Agreement. If the RSU is being earned upon satisfaction of Performance Factors,
then the Committee will: (x) determine the nature, length and starting date of any Performance Period for the RSU; (y) select from among the Performance
Factors to be used to measure the performance, if any; and (z) determine the number of Shares deemed subject to the RSU. Performance Periods may
overlap and participants may participate simultaneously with respect to RSUs that are subject to different Performance Periods and different performance
goals and other criteria.

9.2. Form and Timing of Settlement. Payment of earned RSUs shall be made as soon as practicable after the date(s) determined by the Committee

and set forth in the Award Agreement. The Committee, in its sole discretion, may settle earned RSUs in cash, Shares, or a combination of both. The
Committee may also permit a Participant to defer payment under a RSU to a date or dates after the RSU is earned provided that the terms of the RSU and
any deferral satisfy the requirements of Section 409A of the Code.

9.3. Termination of Service. Except as may be set forth in the Participant’s Award Agreement, vesting ceases on such date Participant’s Service

terminates (unless determined otherwise by the Committee).

10. PERFORMANCE AWARDS. A “Performance Award” is an award to an eligible Employee, Consultant, or Director of a cash bonus or an award of
Performance Shares denominated in Shares that may be settled in cash, or by issuance of those Shares (which may consist of Restricted Stock). Grants of
Performance Awards shall be made pursuant to an Award Agreement.

10.1. Terms of Performance Awards. The Committee will determine, and each Award Agreement shall set forth, the terms of each Performance
Award including, without limitation: (a) the amount of any cash bonus, (b) the number of Shares deemed subject to an award of Performance Shares; (c) the
Performance Factors and Performance Period that shall determine the time and extent to which each Performance Award will be settled or paid (d) the
consideration to be distributed on settlement or payment, and (e) the effect of the Participant’s termination of Service on each Performance Award. In
establishing Performance Factors and the Performance Period the Committee will: (x) determine the nature, length and starting date of any Performance
Period; (y) select from among the Performance Factors to be used; and (z) determine the number of Shares deemed subject to the award of Performance
Shares or the cash value of any cash bonus subject to a Performance Award. Prior to settlement the Committee shall determine the extent to which
Performance Awards have been earned. Performance Periods may overlap and Participants may participate simultaneously with respect to Performance
Awards that are subject to different Performance Periods and different performance goals and other criteria. No Participant will be eligible to receive more
than $5,000,000 in cash bonus Performance Awards in any annual Performance Period under this Plan and for any other Performance Period, such amount
multiplied by a fraction, the numerator of which is the number of months in the Performance Period and the denominator of which is twelve (12).

10.2. Value, Earning and Timing of Performance Shares. Each Performance Share will have an initial value equal to the Fair Market Value of a

Share on the date of grant. After the applicable Performance Period has ended, the holder of Performance Shares will be entitled to receive a payout of the
number of Performance Shares earned by the Participant over the Performance Period, to be determined as a function of the extent to which the
corresponding Performance Factors or other vesting provisions have been achieved. The Committee, in its sole discretion, may pay earned Performance
Shares in the form of cash, in Shares (which have an aggregate Fair Market Value equal to the value of the earned Performance Shares at the close of the
applicable Performance Period) or in a combination thereof.

10.3. Termination of Service. Except as may be set forth in the Participant’s Award Agreement, vesting ceases on the date Participant’s Service
terminates (unless determined otherwise by the Committee) and any unvested Performance Awards shall be forfeited on such date for no consideration.

 
 
11. PAYMENT FOR SHARE PURCHASES. Payment from a Participant for Shares purchased pursuant to this Plan may be made in cash or by check or,
where expressly approved for the Participant by the Committee and where permitted by law (and to the extent not otherwise set forth in the applicable
Award Agreement):

(a) by cancellation of indebtedness of the Company to the Participant;

(b) by surrender of shares of the Company held by the Participant that have a Fair Market Value on the date of surrender equal to the

aggregate exercise price of the Shares as to which said Award will be exercised or settled;

(c) by waiver of compensation due or accrued to the Participant for services rendered or to be rendered to the Company or a Parent or

Subsidiary of the Company;

(d) by consideration received by the Company pursuant to a broker-assisted or other form of cashless exercise program implemented by the

Company in connection with the Plan;

(e) by any combination of the foregoing; or

(f) by any other method of payment as is permitted by applicable law.

12. GRANTS TO NON-EMPLOYEE DIRECTORS. Non-Employee Directors are eligible to receive any type of Award offered under this Plan except
ISOs. No Non-Employee Director may receive Awards under the Plan that, when combined with cash compensation received for service as a Non-
Employee Director, exceed eight hundred thousand dollars ($800,000) in value (as described below) in any calendar year.  The value of Awards for
purposes of complying with this maximum will be determined as follows: (a) for Options and SARs, grant date fair value will be calculated using the
Company’s regular valuation methodology for determining the grant date fair value of Options for reporting purposes and (b) for all other Awards other
than Options and SARs, grant date fair value will be determined by either (i) calculating the product of the Fair Market Value per Share on the date of grant
and the aggregate number of Shares subject to the Award, or (ii) calculating the product using an average of the Fair Market Value over a number of trading
days and the aggregate number of Shares subject to the Award as determined by the Committee. Awards granted to an individual while he or she was
serving in the capacity as an Employee or while he or she was a Consultant but not a Non-Employee Director will not count for purposes of the limitations
set forth in this Section 12. Awards pursuant to this Section 12 may be automatically made pursuant to policy adopted by the Board, or made from time to
time as determined in the discretion of the Board.

12.1. Eligibility. Awards pursuant to this Section 12 shall be granted only to Non-Employee Directors. A Non-Employee Director who is elected or

re-elected as a member of the Board will be eligible to receive an Award under this Section 12.

12.2. Vesting, Exercisability and Settlement. Except as set forth in Section 21, Awards shall vest, become exercisable and be settled as determined
by the Board. With respect to Options and SARs, the exercise price granted to Non-Employee Directors shall not be less than the Fair Market Value of the
Shares at the time that such Option or SAR is granted.

12.3. Election to receive Awards in Lieu of Cash. A Non-Employee Director may, if permitted by the Committee in its sole discretion, elect to

receive his or her annual retainer payments and/or meeting fees from the Company in the form of cash or Awards or a combination thereof, as determined
by the Committee. Such Awards shall be issued under the Plan. An election under this Section 12.3 shall be filed with the Company on the form prescribed
by the Company.

13. WITHHOLDING TAXES.

13.1. Withholding Generally. Whenever Shares are to be issued in satisfaction of Awards granted under this Plan or the applicable tax event occurs,
the Company may require the Participant to remit to the Company, or to the Parent or Subsidiary employing the Participant, an amount sufficient to satisfy
applicable U.S. federal, state, local and international withholding tax requirements or any other tax or social insurance liability legally due from the
Participant prior to the delivery of Shares pursuant to exercise or settlement of any Award. Whenever payments in satisfaction of Awards granted under this
Plan are to be made in cash, such payment will be net of an amount sufficient to satisfy applicable U.S. federal, state, local and international withholding
tax or social insurance requirements or any other tax liability legally due from the Participant. The Fair Market Value of the Shares will be determined as of
the date that the taxes are required to be withheld and such Shares will be valued based on the value of the actual trade or, if there is none, the Fair Market
Value of the Shares as of the previous trading day.

13.2. Stock Withholding. The Committee, or its delegate(s), as permitted by applicable law, in its sole discretion and pursuant to such procedures as

it may specify from time to time and to limitations of local law, may require or permit a Participant to satisfy such tax withholding obligation or any other
tax liability legally due from the Participant, in whole or in

 
 
part by (without limitation) (a) paying cash, (b) electing to have the Company withhold otherwise deliverable cash or Shares having a Fair Market Value
equal to the minimum statutory amount required to be withheld, (c) delivering to the Company already-owned Shares having a Fair Market Value equal to
the minimum amount required to be withheld or (d) withholding from the proceeds of the sale of otherwise deliverable Shares acquired pursuant to an
Award either through a voluntary sale or through a mandatory sale arranged by the Company.

14. TRANSFERABILITY.

14.1. Transfer Generally. Unless determined otherwise by the Committee or pursuant to Section 14.2, an Award may not be sold, pledged, assigned,

hypothecated, transferred, or disposed of in any manner other than by will or by the laws of descent or distribution. If the Committee makes an Award
transferable, including, without limitation, by instrument to an inter vivos or testamentary trust in which the Awards are to be passed to beneficiaries upon
the death of the trustor (settlor) or by gift or by domestic relations order to a Permitted Transferee, such Award will contain such additional terms and
conditions as the Committee deems appropriate. All Awards shall be exercisable: (a) during the Participant’s lifetime only by (i) the Participant, or (ii) the
Participant’s guardian or legal representative; (b) after the Participant’s death, by the legal representative of the Participant’s heirs or legatees; and (c) in the
case of all awards except ISOs, by a Permitted Transferee.

14.2. Award Transfer Program. Notwithstanding any contrary provision of the Plan, the Committee shall have all discretion and authority to
determine and implement the terms and conditions of any Award Transfer Program instituted pursuant to this Section 14.2 and shall have the authority to
amend the terms of any Award participating, or otherwise eligible to participate in, any such Award Transfer Program, including (but not limited to) the
authority to (a) amend (including to extend) the expiration date, post-termination exercise period and/or forfeiture conditions of any such Award, (b) amend
or remove any provisions of the Award relating to the Award holder’s continued service to the Company or its Parent or any Subsidiary, (c) amend the
permissible payment methods with respect to the exercise or purchase of any such Award, (d) amend the adjustments to be implemented in the event of
changes in the capitalization and other similar events with respect to such Award, and (e) make such other changes to the terms of such Award as the
Committee deems necessary or appropriate in its sole discretion.

15. PRIVILEGES OF STOCK OWNERSHIP; RESTRICTIONS ON SHARES.

15.1. Voting and Dividends. No Participant will have any of the rights of a stockholder with respect to any Shares until the Shares are issued to the
Participant, except for any Dividend Equivalent Rights permitted by an applicable Award Agreement. Any Dividend Equivalent Rights shall be subject to
the same vesting or performance conditions as the underlying Award. In addition, the Committee may provide that any Dividend Equivalent Rights
permitted by an applicable Award Agreement shall be deemed to have been reinvested in additional Shares or otherwise reinvested. After Shares are issued
to the Participant, the Participant will be a stockholder and have all the rights of a stockholder with respect to such Shares, including the right to vote and
receive all dividends or other distributions made or paid with respect to such Shares; provided, that if such Shares are Restricted Stock, then any new,
additional or different securities the Participant may become entitled to receive with respect to such Shares by virtue of a stock dividend, stock split or any
other change in the corporate or capital structure of the Company will be subject to the same restrictions as the Restricted Stock; provided, further, that the
Participant will have no right to retain such stock dividends or stock distributions with respect to Shares that are repurchased at the Participant’s Purchase
Price or Exercise Price, as the case may be, pursuant to Section 15.2.

15.2. Restrictions on Shares. At the discretion of the Committee, the Company may reserve to itself and/or its assignee(s) a right to repurchase (a

“Right of Repurchase”) a portion of any or all Unvested Shares held by a Participant following such Participant’s termination of Service at any time within
ninety (90) days (or such longer or shorter time determined by the Committee) after the later of the date Participant’s Service terminates and the date the
Participant purchases Shares under this Plan, for cash and/or cancellation of purchase money indebtedness, at the Participant’s Purchase Price or Exercise
Price, as the case may be.

16. CERTIFICATES. All Shares or other securities (whether or not certificated) delivered under this Plan will be subject to such stock transfer orders,
legends and other restrictions as the Committee may deem necessary or advisable, including restrictions under any applicable U.S. federal, state or foreign
securities law, or any rules, regulations and other requirements of the SEC or any stock exchange or automated quotation system upon which the Shares
may be listed or quoted and any non-U.S. exchange controls or securities law restrictions to which the Shares are subject.

17. ESCROW; PLEDGE OF SHARES. To enforce any restrictions on a Participant’s Shares, the Committee may require the Participant to deposit all
certificates representing Shares, together with stock powers or other instruments of transfer approved by the Committee, appropriately endorsed in blank,
with the Company or an agent designated by the Company to

 
 
hold in escrow until such restrictions have lapsed or terminated, and the Committee may cause a legend or legends referencing such restrictions to be
placed on the certificates. Any Participant who is permitted to execute a promissory note as partial or full consideration for the purchase of Shares under
this Plan will be required to pledge and deposit with the Company all or part of the Shares so purchased as collateral to secure the payment of the
Participant’s obligation to the Company under the promissory note; provided, however, that the Committee may require or accept other or additional forms
of collateral to secure the payment of such obligation and, in any event, the Company will have full recourse against the Participant under the promissory
note notwithstanding any pledge of the Participant’s Shares or other collateral. In connection with any pledge of the Shares, the Participant will be required
to execute and deliver a written pledge agreement in such form as the Committee will from time to time approve. The Shares purchased with the
promissory note may be released from the pledge on a pro rata basis as the promissory note is paid.

18. REPRICING; EXCHANGE AND BUYOUT OF AWARDS. Without prior stockholder approval the Committee may (a) reprice Options or SARs
(and where such repricing is a reduction in the Exercise Price of outstanding Options or SARs, the consent of the affected Participants is not required
provided written notice is provided to them, notwithstanding any adverse tax consequences to them arising from the repricing), and (b) with the consent of
the respective Participants (unless not required pursuant to Section 5.9 of the Plan), pay cash or issue new Awards in exchange for the surrender and
cancellation of any, or all, outstanding Awards.

19. SECURITIES LAW AND OTHER REGULATORY COMPLIANCE. An Award will not be effective unless such Award is in compliance with all
applicable U.S. and foreign federal and state securities and exchange control laws, rules and regulations of any governmental body, and the requirements of
any stock exchange or automated quotation system upon which the Shares may then be listed or quoted, as they are in effect on the date of grant of the
Award and also on the date of exercise or other issuance. Notwithstanding any other provision in this Plan, the Company will have no obligation to issue or
deliver certificates for Shares under this Plan prior to: (a) obtaining any approvals from governmental agencies that the Company determines are necessary
or advisable; and/or (b) completion of any registration or other qualification of such Shares under any state or federal or foreign law or ruling of any
governmental body that the Company determines to be necessary or advisable. The Company will be under no obligation to register the Shares with the
SEC or to effect compliance with the registration, qualification or listing requirements of any foreign or state securities laws, exchange control laws, stock
exchange or automated quotation system, and the Company will have no liability for any inability or failure to do so.

20. NO OBLIGATION TO EMPLOY. Nothing in this Plan or any Award granted under this Plan will confer or be deemed to confer on any Participant
any right to continue in the employ of, or to continue any other relationship with, the Company or any Parent, Subsidiary or Affiliate or limit in any way
the right of the Company or any Parent, Subsidiary or Affiliate to terminate Participant’s employment or other relationship at any time.

21. CORPORATE TRANSACTIONS.

21.1. Assumption or Replacement of Awards by Successor. In the event of a Corporate Transaction any or all outstanding Awards may be assumed
or replaced by the successor corporation, which assumption or replacement shall be binding on all Participants. In the alternative, the successor corporation
may substitute equivalent Awards or provide substantially similar consideration to Participants as was provided to stockholders (after taking into account
the existing provisions of the Awards). The successor corporation may also issue, in place of outstanding Shares of the Company held by the Participant,
substantially similar shares, cash or other property subject to repurchase restrictions no less favorable to the Participant. In the event such successor or
acquiring corporation (if any) refuses to assume, convert, replace or substitute Awards, as provided above, pursuant to a Corporate Transaction, then
notwithstanding any other provision in this Plan to the contrary, such Awards shall have their vesting accelerate as to all shares subject to such Award (and
any applicable rights of repurchase shall fully lapse) immediately prior to the Corporate Transaction. In addition, in the event such successor or acquiring
corporation (if any) refuses to assume, convert, replace or substitute Awards, as provided above, pursuant to a Corporate Transaction, the Committee will
(i) notify the Participant in writing or electronically that such Award will, if applicable, be exercisable for a period of time determined by the Committee in
its sole discretion, and such Award will terminate upon the earlier of the expiration of such period or immediately prior to the Corporate Transaction or
(ii) provide that each Award shall be cancelled immediately upon the occurrence of the Corporate Transaction in exchange for a payment in cash or
securities in an amount equal to (A) the excess of the consideration paid per Share in the Corporate Transaction over the exercise price or purchase price (if
any) per Share subject to the Award multiplied by (B) the number of Shares subject to the Award. Awards need not be treated similarly in a Corporate
Transaction.

21.2. Assumption of Awards by the Company. The Company, from time to time, also may substitute or assume outstanding awards granted by

another company, whether in connection with an acquisition of such other company or otherwise, by either; (a) granting an Award under this Plan in
substitution of such other company’s award; or (b) assuming

 
 
such award as if it had been granted under this Plan if the terms of such assumed award could be applied to an Award granted under this Plan. Such
substitution or assumption will be permissible if the holder of the substituted or assumed award would have been eligible to be granted an Award under this
Plan if the other company had applied the rules of this Plan to such grant. In the event the Company assumes an award granted by another company, the
terms and conditions of such award will remain unchanged (except that the Purchase Price or the Exercise Price, as the case may be, and the number and
nature of Shares issuable upon exercise or settlement of any such Award will be adjusted appropriately pursuant to Section 424(a) of the Code). In the event
the Company elects to grant a new Option in substitution of rather than assumption of an existing option, such new Option may be granted with a similarly
adjusted Exercise Price. Substitute Awards shall not reduce the number of Shares authorized for grant under the Plan or authorized for grant to a Participant
in a calendar year.

21.3. Non-Employee Directors’ Awards. Notwithstanding any provision to the contrary herein, in the event of a Corporate Transaction, the vesting
of all Awards granted to Non-Employee Directors shall accelerate immediately prior to the consummation of such Corporate Transaction and such Awards
shall become exercisable (as applicable) in full prior to the consummation of such event at such times and on such conditions as the Committee determines.

22. ADOPTION AND STOCKHOLDER APPROVAL. This Plan shall be submitted for the approval of the Company’s stockholders, consistent with
applicable laws, within twelve (12) months before or after the date this Plan is adopted by the Board.

23. TERM OF PLAN/GOVERNING LAW. Unless earlier terminated as provided herein, this Plan will become effective on the Effective Date and will
terminate ten (10) years from the date this Plan is adopted by the Board. This Plan and all Awards granted hereunder shall be governed by and construed in
accordance with the laws of the State of Delaware (excluding its conflict of law rules).

24. AMENDMENT OR TERMINATION OF PLAN. The Board may at any time terminate or amend this Plan in any respect, including, without
limitation, amendment of any form of Award Agreement or instrument to be executed pursuant to this Plan; provided, however, that the Board will not,
without the approval of the stockholders of the Company, amend this Plan in any manner that requires such stockholder approval; provided further, that a
Participant’s Award shall be governed by the version of this Plan then in effect at the time such Award was granted.

25. NONEXCLUSIVITY OF THE PLAN. Neither the adoption of this Plan by the Board, the submission of this Plan to the stockholders of the Company
for approval, nor any provision of this Plan will be construed as creating any limitations on the power of the Board to adopt such additional compensation
arrangements as it may deem desirable, including, without limitation, the granting of stock awards and bonuses otherwise than under this Plan, and such
arrangements may be either generally applicable or applicable only in specific cases.

26. INSIDER TRADING POLICY. Each Participant who receives an Award shall comply with any policy adopted by the Company from time to time
covering transactions in the Company’s securities by Employees, officers and/or directors of the Company.

27. ALL AWARDS SUBJECT TO COMPANY CLAWBACK OR RECOUPMENT POLICY. All Awards, subject to applicable law, shall be subject to
clawback or recoupment pursuant to any compensation clawback or recoupment policy adopted by the Board or required by law during the term of
Participant’s employment or other service with the Company that is applicable to executive officers, employees, directors or other service providers of the
Company, and in addition to any other remedies available under such policy and applicable law, may require the cancellation of outstanding Awards and the
recoupment of any gains realized with respect to Awards.

28. DEFINITIONS. As used in this Plan, and except as elsewhere defined herein, the following terms will have the following meanings:

28.1. “Affiliate” means (i) any entity that, directly or indirectly, is controlled by, controls or is under common control with, the Company and

(ii) any entity in which the Company has a significant equity interest, in either case as determined by the Committee, whether now or hereafter existing.

28.2. “Amendment Effective Date” means the date on which the amendments to the Plan are approved by the Board and the Company

stockholders.

28.3 “Award” means any award under the Plan, including any Option, Restricted Stock, Stock Bonus Award, Stock Appreciation Right, Restricted

Stock Unit, Performance Award or award of Performance Shares.

 
 
28.4. “Award Agreement” means, with respect to each Award, the written or electronic agreement between the Company and the Participant setting

forth the terms and conditions of the Award, and country-specific appendix thereto for grants to non-U.S. Participants, which shall be in substantially a
form (which need not be the same for each Participant) that the Committee (or in the case of Award agreements that are not used for Insiders, the
Committee’s delegate(s)) has from time to time approved, and will comply with and be subject to the terms and conditions of this Plan.

28.5. “Award Transfer Program” means any program instituted by the Committee which would permit Participants the opportunity to transfer any

outstanding Awards to a financial institution or other person or entity approved by the Committee.

28.6. “Board” means the Board of Directors of the Company.

28.7. “Cause” means (a) Participant’s conviction (including a guilty plea or plea of nolo contendere) of any felony or any other crime involving

fraud, dishonesty or moral turpitude; (b) Participant’s commission or attempted commission of or participation in a fraud or act of dishonesty or
misrepresentation against the Company that results (or could reasonably be expected to result) in material harm or injury to the business or reputation of the
Company; (c) Participant’s material violation of any contract or agreement between Participant and the Company, or of any Company policy, or of any
statutory duty Participant owes to the Company; or (d) Participant’s conduct that constitutes gross insubordination, incompetence or habitual neglect of
duties and that results in (or could reasonably be expected to have resulted in) material harm to the business or reputation of the Company. The
determination as to whether a Participant is being terminated for Cause shall be made in good faith by the Company and shall be final and binding on the
Participant. The foregoing definition does not in any way limit the Company’s ability to terminate a Participant’s employment or consulting relationship at
any time as provided in Section 20 above, and the term “Company” will be interpreted to include any Subsidiary or Parent, as appropriate. Notwithstanding
the foregoing, the foregoing definition of “Cause” may, in part or in whole, be modified or replaced in each individual employment agreement or Award
Agreement with any Participant, provided that such document supersedes the definition provided in this Section 28.6.

28.8. “Code” means the United States Internal Revenue Code of 1986, as amended, and the regulations promulgated thereunder.

28.9. “Committee” means the Compensation Committee of the Board or those persons to whom administration of the Plan, or part of the Plan, has

been delegated as permitted by law.

28.10. “Common Stock” means the common stock of the Company.

28.11. “Company” means Sierra Oncology, Inc., or any successor corporation.

28.12. “Consultant” means any natural person, including an advisor or independent contractor, engaged by the Company or a Parent, Subsidiary or

Affiliate to render services to such entity.

28.13. “Corporate Transaction” means the occurrence of any of the following events: (a) any “Person” (as such term is used in Sections 13(d) and

14(d) of the Exchange Act) becomes the “beneficial owner” (as defined in Rule 13d-3 of the Exchange Act), directly or indirectly, of securities of the
Company representing more than fifty percent (50%) of the total voting power represented by the Company’s then-outstanding voting securities; provided,
however, that for purposes of this subclause (a) the acquisition of additional securities by any one Person who is considered to own more than fifty percent
(50%) of the total voting power of the securities of the Company will not be considered a Corporate Transaction; (b) the consummation of the sale or
disposition by the Company of all or substantially all of the Company’s assets; (c) the consummation of a merger or consolidation of the Company with any
other corporation, other than a merger or consolidation which would result in the voting securities of the Company outstanding immediately prior thereto
continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or its parent) at least fifty
percent (50%) of the total voting power represented by the voting securities of the Company or such surviving entity or its parent outstanding immediately
after such merger or consolidation; (d) any other transaction which qualifies as a “corporate transaction” under Section 424(a) of the Code wherein the
stockholders of the Company give up all of their equity interest in the Company (except for the acquisition, sale or transfer of all or substantially all of the
outstanding shares of the Company) or (e) a change in the effective control of the Company that occurs on the date that a majority of members of the Board
are replaced during any twelve (12) month period by members of the Board whose appointment or election is not endorsed by as majority of the members
of the Board prior to the date of such appointment or election. For purpose of this subclause (e), if any Person is considered to be in effective control of the
Company, the acquisition of additional control of the Company by the same Person will not be considered a Corporate Transaction. For purposes of this
definition, Persons will be considered to be acting as a group if they are owners of a corporation that enters into a merger, consolidation, purchase or
acquisition of

 
 
stock, or similar business transaction with the Company. Notwithstanding the foregoing, to the extent that any amount constituting deferred compensation
(as defined in Section 409A of the Code) would become payable under this Plan by reason of a Corporate Transaction, such amount shall become payable
only if the event constituting a Corporate Transaction would also qualify as a change in ownership or effective control of the Company or a change in the
ownership of a substantial portion of the assets of the Company, each as defined within the meaning of Code Section 409A, as it has been and may be
amended from time to time, and any proposed or final Treasury Regulations and IRS guidance that has been promulgated or may be promulgated
thereunder from time to time.

28.14. “Director” means a member of the Board.

28.15. “Disability” means in the case of incentive stock options, total and permanent disability as defined in Section 22(e)(3) of the Code and in the
case of other Awards, that the Participant is unable to engage in any substantial gainful activity by reason of any medically determinable physical or mental
impairment that can be expected to result in death or can be expected to last for a continuous period of not less than 12 months.

28.16. “Dividend Equivalent Right” means the right of a Participant, granted at the discretion of the Committee or as otherwise provided by the
Plan or an Award Agreement, to receive a credit for the account of such Participant in an amount equal to the cash, stock or other property dividends in
amounts equal equivalent to cash, stock or other property dividends for each Share represented by an Award held by such Participant.

28.17. “Effective Date” means the day immediately prior to the date of the underwritten initial public offering of the Company’s Common Stock

pursuant to a registration statement that is declared effective by the SEC.

28.18. “Employee” means any person, including Officers and Directors, providing services as an employee to the Company or any Parent,
Subsidiary or Affiliate. Neither service as a Director nor payment of a director’s fee by the Company will be sufficient to constitute “employment” by the
Company.

28.19. “Exchange Act” means the United States Securities Exchange Act of 1934, as amended.

28.20. “Exchange Program” means a program pursuant to which (a) outstanding Awards are surrendered, cancelled or exchanged for cash, the

same type of Award or a different Award (or combination thereof) or (b) the exercise price of an outstanding Award is increased or reduced.

28.21. “Exercise Price” means, with respect to an Option, the price at which a holder may purchase the Shares issuable upon exercise of an Option

and with respect to a SAR, the price at which the SAR is granted to the holder thereof.

28.22. “Fair Market Value” means, as of any date, the value of a share of the Company’s Common Stock determined as follows:

(a) if such Common Stock is publicly traded and is then listed on a national securities exchange, its closing price on the date of
determination on the principal national securities exchange on which the Common Stock is listed or admitted to trading as reported in The Wall
Street Journal or such other source as the Committee deems reliable;

(b) if such Common Stock is publicly traded but is neither listed nor admitted to trading on a national securities exchange, the average of the

closing bid and asked prices on the date of determination as reported in The Wall Street Journal or such other source as the Committee deems reliable;

(c) in the case of an Option or SAR grant made on the Effective Date, the price per share at which shares of the Company’s Common Stock

are initially offered for sale to the public by the Company’s underwriters in the initial public offering of the Company’s Common Stock pursuant to a
registration statement filed with the SEC under the Securities Act; or

(d) if none of the foregoing is applicable, by the Board or the Committee in good faith.

28.23. “Insider” means an officer or director of the Company or any other person whose transactions in the Company’s Common Stock are subject

to Section 16 of the Exchange Act.

28.24. “IRS” means the United States Internal Revenue Service.

28.25. “Non-Employee Director” means a Director who is not an Employee of the Company or any Parent or Subsidiary.

 
 
28.26. “Option” means an award of an option to purchase Shares pursuant to Section 5.

28.27. “Parent” means any corporation (other than the Company) in an unbroken chain of corporations ending with the Company if each of such

corporations other than the Company owns stock possessing fifty percent (50%) or more of the total combined voting power of all classes of stock in one of
the other corporations in such chain.

28.28. “Participant” means a person who holds an Award under this Plan.

28.29. “Performance Award” means cash or stock granted pursuant to Section 10 of the Plan.

28.30. “Performance Factors” means any of the factors selected by the Committee and specified in an Award Agreement, from among the

following objective measures, either individually, alternatively or in any combination, applied to the Company as a whole or any business unit or
Subsidiary, either individually, alternatively, or in any combination, on a GAAP or non-GAAP basis, and measured, to the extent applicable on an absolute
basis or relative to a pre-established target, to determine whether the performance goals established by the Committee with respect to applicable Awards
have been satisfied:

(a) Profit Before Tax;

(b) Billings;

(c) Revenue;

(d) Net revenue;

(e) Earnings (which may include earnings before interest and taxes, earnings before taxes, and net earnings);

(f) Operating income;

(g) Operating margin;

(h) Operating profit;

(i) Controllable operating profit, or net operating profit;

(j) Net Profit;

(k) Gross margin;

(l) Operating expenses or operating expenses as a percentage of revenue;

(m) Net income;

(n) Earnings per share;

(o) Total stockholder return;

(p) Market share;

(q) Return on assets or net assets;

(r) The Company’s stock price;

(s) Growth in stockholder value relative to a pre-determined index;

(t) Return on equity;

(u) Return on invested capital;

(v) Cash Flow (including free cash flow or operating cash flows)

(w) Cash conversion cycle;

(x) Economic value added;

(y) Individual confidential business objectives;

(z) Contract awards or backlog;

(aa) Overhead or other expense reduction;

 
 
 
(bb) Credit rating;

(cc) Strategic plan development and implementation;

(dd) Succession plan development and implementation;

(ee) Improvement in workforce diversity;

(ff) Customer indicators;

(gg) New product invention or innovation;

(hh) Attainment of research and development milestones;

(ii) Improvements in productivity;

(jj) Bookings; and

(kk) Attainment of objective operating goals and employee metrics.

The Committee may, in recognition of unusual or non-recurring items such as acquisition-related activities or changes in applicable accounting

rules, provide for one or more equitable adjustments (based on objective standards) to the Performance Factors to preserve the Committee’s original intent
regarding the Performance Factors at the time of the initial award grant. It is within the sole discretion of the Committee to make or not make any such
equitable adjustments.

28.31. “Performance Period” means the period of service determined by the Committee, not to exceed five (5) years, during which years of service

or performance is to be measured for the Award.

28.32. “Performance Share” means an Award granted pursuant to Section 10 of the Plan.

28.33. “Permitted Transferee” means any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, former spouse, sibling, niece,
nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law (including adoptive relationships) of the Employee, any
person sharing the Employee’s household (other than a tenant or employee), a trust in which these persons (or the Employee) have more than 50% of the
beneficial interest, a foundation in which these persons (or the Employee) control the management of assets, and any other entity in which these persons (or
the Employee) own more than 50% of the voting interests.

28.34. “Plan” means this Sierra Oncology, Inc. 2015 Equity Incentive Plan (formerly called the ProNai Therapeutics, Inc. 2015 Equity Incentive

Plan).

SAR.

28.35. “Purchase Price” means the price to be paid for Shares acquired under the Plan, other than Shares acquired upon exercise of an Option or

28.36. “Restricted Stock Award” means an award of Shares pursuant to Section 6 of the Plan, or issued pursuant to the early exercise of an Option.

28.37. “Restricted Stock Unit” means an Award granted pursuant to Section 9 of the Plan.

28.38. “SEC” means the United States Securities and Exchange Commission.

28.39. “Securities Act” means the United States Securities Act of 1933, as amended.

 
 
 
28.40. “Service” shall mean service as an Employee, Consultant, Director or Non-Employee Director, to the Company or a Parent, Subsidiary or
Affiliate, subject to such further limitations as may be set forth in the Plan or the applicable Award Agreement. An Employee will not be deemed to have
ceased to provide Service in the case of (a) sick leave, (b) military leave, or (c) any other leave of absence approved by the Company; provided, that such
leave is for a period of not more than 90 days (x) unless reemployment upon the expiration of such leave is guaranteed by contract or statute, or (y) unless
provided otherwise pursuant to formal policy adopted from time to time by the Company and issued and promulgated to employees in writing. In the case
of any Employee on an approved leave of absence or a reduction in hours worked (for illustrative purposes only, a change in schedule from that of full-time
to part-time), the Committee may make such provisions regarding suspension of or modification of vesting of the Award while on leave from the employ of
the Company or a Parent, Subsidiary or Affiliate or during such change in working hours as it may deem appropriate, except that in no event may an Award
be exercised after the expiration of the term set forth in the applicable Award Agreement. In the event of military leave, if required by applicable laws,
vesting shall continue for the longest period that vesting continues under any other statutory or Company approved leave of absence and, upon a
Participant’s returning from military leave (under conditions that would entitle him or her to protection upon such return under the Uniform Services
Employment and Reemployment Rights Act), he or she shall be given vesting credit with respect to Awards to the same extent as would have applied had
the Participant continued to provide services to the Company throughout the leave on the same terms as he or she was providing services immediately prior
to such leave. Except as set forth in this Section 28.39, an employee shall have terminated employment as of the date he or she ceases provide services
(regardless of whether the termination is in breach of local employment laws or is later found to be invalid) and employment shall not be extended by any
notice period or garden leave mandated by local law, provided however, that a change in status from an employee to a consultant or advisor shall not
terminate the service provider’s Service, unless determined by the Committee, in its discretion. The Committee will have sole discretion to determine
whether a Participant has ceased to provide Services and the effective date on which the Participant ceased to provide Services.

28.41. “Shares” means shares of Common Stock and the common stock of any successor entity.

28.42. “Stock Appreciation Right” means an Award granted pursuant to Section 8 of the Plan.

28.43. “Stock Bonus” means an Award granted pursuant to Section 7 of the Plan.

28.44. “Subsidiary” means any corporation (other than the Company) in an unbroken chain of corporations beginning with the Company if each of

the corporations other than the last corporation in the unbroken chain owns stock possessing fifty percent (50%) or more of the total combined voting
power of all classes of stock in one of the other corporations in such chain.

28.45. “Treasury Regulations” means regulations promulgated by the United States Treasury Department.

28.46. “Unvested Shares” means Shares that have not yet vested or are subject to a right of repurchase in favor of the Company (or any successor

thereto).

 
 
 
 
SIERRA ONCOLOGY, INC.

(the “Company”)

2015 EQUITY INCENTIVE PLAN

(the “Plan”)

ADDENDUM FOR CANADIAN PARTICIPANTS

A.

The Company has adopted the Plan, to be effective on the Effective Date.

B.

C.

The Company desires to modify certain terms of the Plan in their application for Directors, Non-Employee Directors and Employees (as those terms
are defined in the Plan) who are resident in Canada for purposes of the Income Tax Act (Canada) or otherwise subject to Canadian personal income
tax (the “Canadian Participants”).

Under the Income Tax Act (Canada), Directors, Non-Employee Directors and Employees who are Canadian Participants are treated as officers and
employees for purposes of that Act.

NOW THEREFORE, the Company does hereby amend certain terms and conditions of the Plan as they apply to the Canadian Participants, as

follows.

1.

2.

3.

Defined Terms.    In this Addendum, all defined terms shall have the respective meanings set forth in the Plan, unless otherwise defined herein.

Effective Date.    The effective date of this Addendum is the Effective Date.

Options.

(a) Options granted to Canadian Participants will be NSOs.

(b) Notwithstanding section 5.2 of the Plan, the grant date of an Option awarded to a Canadian Participant shall be, in all cases, the date the Option

is actually granted to the Canadian Participant, as evidenced by the Award Agreement.

(c) Notwithstanding section 5.1 of the Plan, satisfaction of Performance Factors, if any, will be treated as a condition subsequent to the grant to a

Canadian Participant of an Option giving rise to a risk of forfeiture of the Option and not a condition precedent to the grant of the Option.

(d)

For purposes of section 5.9 of the Plan, Options granted to a Canadian Participant will not be modified or altered, or new options granted in
substitution therefor, if such modification, alteration or substitution has a material adverse affect on such Canadian Participant’s tax treatment
of such Options, except with such Canadian Participant’s consent.

4.

Stock Bonus Awards.

Section 7.2 of the Plan shall be modified as it applies to Canadian Participants such that the Company is required to issue Shares in payment of a
Stock Bonus Award to a Canadian Participant and the Company cannot choose, at its option, to make such payment in cash or a combination of cash
and Shares, and section 7.2 shall read as follows:

“7.2.     Form of Payment to Canadian Participant.     Payment of a Stock Bonus Award to a Canadian Participant shall be settled solely by the
issuance of Shares.”

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
 
    
 
 
5.

Stock Appreciation Rights.

(a)

(b)

Section 8.2 of the Plan shall be modified as it applies to Canadian Participants such that the Committee will provide that a SAR (or a portion
thereof) becomes exercisable on the date of vesting of the SAR (or portion thereof), which date will be the date of exercise of the SAR (or
portion thereof) for purposes of section 8.3 of the Plan. The relevant SAR (or portion thereof) will be deemed to be exercised on that date and
the Canadian Participant will be immediately entitled to receive payment from the Company under section 8.3 of the Plan.

Section 8.3 of the Plan shall be modified as it applies to Canadian Participants such that each SAR (or portion thereof) that vests and is deemed
to be exercised pursuant to section 8.2 of the Plan (as modified by section 4(a) of this Addendum) shall be settled and paid out to the Canadian
Participant as soon as practicable after the date of such vesting, and the terms of the SAR shall not, in any circumstances, provide for a deferral
of such payment.

6.

Restricted Stock Units.

Section 9.2 of the Plan shall be modified as it applies to Canadian Participants such that the Company agrees to issue only Shares in payment of
RSUs to a Canadian Participant and the Company cannot choose, at its option, to make such payment in cash or a combination of cash and Shares,
and section 9.2 shall read as follows:

“9.2. Form and Timing of Settlement to Canadian Participants. Payment of earned RSUs of a Canadian Participant shall be made as soon as
practicable after the date(s) determined by the Committee and set forth in the Award Agreement. Such earned RSUs shall be settled solely by
the issuance of Shares. The Committee may permit a Canadian Participant to defer settlement and the issuance of Shares in payment of an
earned RSU to a date that is acceptable to the Committee, provided that the terms of the Award Agreement, the RSUs and any deferral meet the
conditions of section 7 of the Income Tax Act (Canada).”

7.

Performance Awards.

(a)

Section 10.1 of the Plan shall be modified as it applies to Canadian Participants and shall read as follows:

“10.1 Terms of Performance Awards. The Committee will determine, and each Award Agreement shall set for the terms of each Performance
Award, including, without limitation, the consideration to be distributed on settlement or payment; the Performance Factors and the
Performance Period that shall determine the time and extent to which each Performance Award will be settled or paid; and the effect of the
Canadian Participant’s termination of Service on each Performance Award. In establishing Performance Factors and the Performance Period
the Committee will: (x) determine the nature, length and starting date of any Performance Period; (y) select from among the Performance
Factors to be used; and (z) determine the number of Shares deemed subject to the award of Performance Shares or the cash value of any cash
bonus subject to a Performance Award.

10.1.1 If the Performance Award is in the form of a cash bonus, the Committee shall determine, and the Award Agreement shall provide, that
the Performance Award must be paid out to the Canadian Participant within three (3) years after the end of the first year in which the services
were performed and in respect of which that Performance Award is granted.

10.1.2 If the Performance Award is in the form of Performance Shares, the Committee shall determine, and the Award Agreement shall set
forth, the number of Shares deemed subject to such award of Performance Shares.

10.1.3 Prior to settlement of any Performance Award the Committee shall determine the extent to which such Performance Award has been
earned. Subject to section 10.1.1, Performance Periods may overlap and Participants may participate simultaneously with respect to
Performance Awards that are, subject to different Performance Periods and different performance goals and other criteria. No Participant will
be eligible to receive more than $5,000,000 in cash bonus Performance Awards in any annual Performance Period under this Plan, and for any
other Performance Period, such amount multiplied by a fraction, the number of which is the number of months in the Performance period and
the denominator of which is twelve (12).”

 
 
 
 
 
 
 
    
 
 
    
 
 
 
 
 
    
 
 
    
 
 
    
 
 
    
 
 
(b)

Section 10.2 of the Plan shall be modified as it applies to Canadian Participants in respect of Performance Shares such that the Company
agrees to issue only Shares in payment of awards of Performance Shares to a Canadian Participant and neither the Committee nor the Company
may choose, at its option, to make such payment in cash or a combination of cash and Shares.

8.

Payment for Share Purchases.

Section 11(b) of the Plan shall be modified as at applies to Canadian Participants with respect to the consideration that may be paid by Canadian
Participants for Shares purchased pursuant to the Plan. In no circumstances shall a Canadian Participant be permitted to make, and the Committee
shall not approve, a payment by the Canadian Participant by the surrender of any Shares that were acquired at any time by the Canadian Participant
on the exercise of any Option.

9. Withholding Taxes.

(a)

Section 13.1 of the Plan shall be modified as it applies to Canadian Participants and shall read as follows:

“13.1 Withholding for Canadian Participants. The Company or any Affiliate may take such reasonable steps for the deduction and withholding
of any taxes and other required source deductions which the Company or Affiliate, as the case may be, is required by law or regulation of any
governmental authority whatsoever to remit in connection with the exercise or settlement of any Award granted to a Canadian Participant.
Without limiting the generality of the foregoing, whenever a settlement or payment is made by the issuance of Shares to a Canadian Participant
in satisfaction of Awards granted under this Plan, the Company or Affiliate, as the case may be, may, at its discretion (i) deduct and withhold
those amounts it is required to remit from any cash remuneration or other amount payable to the Canadian Participant, whether or not such
amount payable is related to the Plan, or the exercise or settlement of any Awards; (ii) permit the Canadian Participant to make a cash payment
to the Company or Affiliate, as the case may be, equal to the amount required to be remitted; or (iii) sell, on behalf of the Canadian Participant,
that number of Shares to be issued on the exercise or settlement such that the amount of the proceeds of such sale will be sufficient to satisfy
any taxes or other source deductions required to be remitted for the account of the Canadian Participant. If the Company or Affiliate, as the
case may be,

considers that the foregoing steps undertaken in connection with this section 13.1 result in inadequate withholding or a late remittance of taxes
or other source deductions, then the delivery of Shares to be issued on the exercise or settlement of Awards may be made conditional upon the
Canadian Participant (or other person) reimbursing or compensating the Company or Affiliate or making arrangements satisfactory to the
Company or Affiliate for the payment in a timely manner of all taxes and other source deductions required to be remitted.”

(b)

Section 13.2 of the Plan shall not apply to Canadian Participants. For greater certainty, the Committee shall not approve funding by a Canadian
Participant of withholding taxes or other source deductions by the withholding of Shares the Canadian Participant is otherwise entitled to
receive or the surrender by the Canadian Participant of any Shares that were acquired at any time by the Canadian Participant on the exercise
of any Option.

 
 
 
 
 
 
    
 
 
 
 
 
    
 
 
 
 
 
 
 
 
NOTICE OF STOCK OPTION  GRANT

SIERRA ONCOLOGY, INC. 2015 EQUITY INCENTIVE PLAN

Unless otherwise defined herein, the terms defined in the Sierra Oncology, Inc. (the “Company”) 2015 Equity Incentive Plan (the “Plan”) shall have the
same meanings in this Notice of Stock Option Grant (the “Notice of Grant”) and the attached Stock Option Agreement (the “Option Agreement”). You
have been granted an Option to purchase shares of Common Stock of the Company under the Plan subject to the terms and conditions of the Plan, this
Notice of Grant and the attached Option Agreement.

Name:

Address:

Date of Grant:

Vesting Commencement Date:

  Exercise Price per Share:

  Total Number of Shares:

  Type of Option:

  Non-Qualified Stock Option

        Incentive Stock Option

Expiration Date:

Vesting Schedule:

Additional Terms:

                 , 20   ; This Option expires earlier if your Service terminates earlier, as described in the Stock Option
Agreement.

  If this box is checked, the additional terms and conditions set forth on Attachment 1 hereto (as executed by the Company)
are applicable and are incorporated herein by reference. No document need be attached as Attachment 1 if the box is not
checked.

You understand that your employment or consulting relationship with the Company is for an unspecified duration, can be terminated at any time (i.e., is
“at-will”), and that nothing in this Notice, the Option Agreement or the Plan changes the at-will nature of that relationship. By accepting this Option, you
and the Company agree that this Option is granted under and governed by the terms and conditions of the Plan, the Notice of Grant and the Option
Agreement. By accepting this Option, you consent to electronic delivery as set forth in the Option Agreement.

PARTICIPANT:

SIERRA ONCOLOGY, INC.

Signature:

Print Name:

By:

Name:

Its:

1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
 
 
 
 
   
 
 
 
   
 
 
 
 
   
 
 
 
 
 
   
 
 
 
   
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
STOCK OPTION AGREEMENT

SIERRA ONCOLOGY, INC. 2015 EQUITY INCENTIVE PLAN

You have been granted an Option by Sierra Oncology, Inc. (the “Company”) under the 2015 Equity Incentive Plan (the “Plan”) to purchase Shares
(the “Option”), subject to the terms, restrictions and conditions of the Plan, the Notice of Stock Option Grant (the “Notice of Grant”) and this Stock Option
Agreement (the “Agreement”).

1.

Grant of Option. You have been granted an Option for the number of Shares set forth in the Notice of Grant at the exercise price per

Share set forth in the Notice of Grant (the “Exercise Price”). In the event of a conflict between the terms and conditions of the Plan and the terms and
conditions of this Agreement, the terms and conditions of the Plan shall prevail. If designated in the Notice of Grant as an Incentive Stock Option (“ISO”),
this Option is intended to qualify as an Incentive Stock Option under Section 422 of the Code. However, if this Option is intended to be an ISO, to the extent
that it exceeds the $100,000 rule of Code Section 422(d) it shall be treated as a Nonqualified Stock Option (“NSO”).

2.

Termination Period.

(a)

General Rule. If your Service terminates for any reason except death or Disability, and other than for Cause, then this Option will

expire at the close of business at Company headquarters on the date three (3) months after your termination of Service (subject to the expiration detailed in
Section 6). If your Service is terminated for Cause, this Option will expire upon the date of such termination. The Company determines when your Service
terminates for all purposes under this Agreement. You acknowledge and agree that the Vesting Schedule may change prospectively in the event that your
service status changes between full and part-time status in accordance with Company policies relating to work schedules and vesting of awards. You
acknowledge that the vesting of the Shares pursuant to this Notice is earned only by continuing Service and that any unvested portion of your Option will
expire on the termination of your employment for any reason.

(b)

Death; Disability. If you die before your Service terminates (or you die within three (3) months of your termination of Service
other than for Cause), then this Option will expire at the close of business at Company headquarters on the date twelve  (12)  months  after  the  date  of  your
death  (subject  to  the  expiration  detailed  in  Section  6).  If  your  Service  terminates  because  of  your  Disability,  then  this  Option  will  expire  at  the  close  of
business at Company headquarters on the date twelve (12) months after your termination date (subject to the expiration detailed in Section 6).

(c)

Black-Out Period. Notwithstanding the foregoing, if any post-termination exercise period set forth above terminates on a date that
falls within a Blackout Period (as defined below) or within ten (10) business days following the expiration of a Blackout Period, such expiration date shall be
automatically extended without any further act or formality to that date which is ten (10) business days after the end of such Blackout Period, with such
tenth (10th) business day to be considered the expiration date of such Option for all purposes under the Plan, subject to earlier expiration
detailed in Section 6. For purposes of this Agreement, “Blackout Period” means the period during which designated directors, officers and
employees of the Company cannot trade Shares pursuant to the Company’s policy respecting restrictions on director’, officers’ and employee
trading which is in effect at the time.

(d)

No Notice. You are responsible for keeping track of these exercise periods following your termination of Service for any reason.
The Company will not provide further notice of such periods. In no event shall this Option be exercised later than the Expiration Date set forth in the Notice
of Grant.2

3.

Exercise of Option.

(a)

Right to Exercise. This Option is exercisable during its term in accordance with the Vesting Schedule set forth in the Notice of

Grant and the applicable provisions of the Plan and this Agreement. In the event of your death, Disability, or other cessation of Service, the exercisability of
the Option is governed by the applicable provisions of the Plan, the Notice of Grant and this Agreement. This Option may not be exercised for a fraction of a
Share.

(b)

Method of Exercise. This Option is exercisable by delivery of an exercise notice in a form specified by the Company (the
“Exercise Notice”), which shall state the election to exercise the Option, the number of Shares in respect of which the Option is being exercised (the
“Exercised Shares”), and such other representations and agreements as may be required by the Company pursuant to the provisions of the Plan. The Exercise
Notice shall be delivered in person, by mail, via electronic mail or facsimile or by other authorized method to the Secretary of the Company or other person
designated by the Company. The Exercise Notice shall be accompanied by payment of the aggregate Exercise Price as to all Exercised Shares. This Option
shall be deemed to be exercised upon receipt by the Company of a fully executed Exercise Notice accompanied by the aggregate Exercise Price and any
applicable tax withholding due upon exercise of the Option.

(c)

Exercise by Another. If another person wants to exercise this Option after it has been transferred to him or her in compliance with

this Agreement and the Plan, that person must prove to the Company’s satisfaction that he or she is

2

 
 
entitled to exercise this Option. That person must also complete the proper Exercise Notice form (as described above) and pay the Exercise Price (as
described below) and any applicable tax withholding due upon exercise of the Option (as described below).

4.

Method of Payment. Payment of the aggregate Exercise Price shall be by personal check, wire transfer, cashier’s check, or, with the

Company’s consent; any of the following, or a combination thereof:

(a)

certificates for shares of Company stock that you own, along with any forms needed to effect a transfer of those shares to the

Company; the Fair Market Value of the shares, determined as of the effective date of the Option exercise, will be applied to the Option Exercise Price. Instead
of surrendering shares of Company stock, you may attest to the ownership of those shares on a form provided by the Company and have the same number of
shares subtracted from the Option shares issued to you. However, you may not surrender, or attest to the ownership of, shares of Company stock in payment
of the Exercise Price of your Option if your action would cause the Company to recognize compensation expense (or additional compensation expense) with
respect to this Option for financial reporting purposes;

(b)

cashless exercise through irrevocable directions to a securities broker approved by the Company to sell all or part of the Shares

covered by this Option and to deliver to the Company from the sale proceeds an amount sufficient to pay the Option Exercise Price and any withholding
taxes. The balance of the sale proceeds, if any, will be delivered to you. The directions must be given by signing a special notice of exercise form provided by
the Company; or

(c)

other method authorized by the Company.

5.

Non-Transferability of Option. In general, except as provided below, only you may exercise this Option prior to your death. You may not
transfer or assign this Option, except as provided below. For instance, you may not sell this Option or use it as security for a loan. If you attempt to do any of
these things, this Option will immediately become invalid. You may, however, dispose of this Option in your will or in a beneficiary designation. However, if
this Option is designated as a NSO in the Notice of Grant, then the Committee (as defined in the Plan) may, in its sole discretion, allow you to transfer this
Option as a gift to one or more family members. For purposes of this Agreement, “family member” means a child, stepchild, grandchild, parent,
stepparent, grandparent, spouse, former spouse, sibling, niece, nephew, mother-in- law, father-in-law, son-in-law, daughter-in-law, brother-in-
law or sister-in-law (including adoptive relationships), any individual sharing your household (other than a tenant or employee), a trust in
which one or more of these individuals have more than 50% of the beneficial interest, a foundation in which you or one or more of these
persons control the management of assets, and any entity in which you or one or more of these persons own more than 50% of the voting
interest. In addition, if this Option is designated as a NSO in the Notice of Grant, then the Committee may, in its sole discretion, allow you to
transfer this Option to your spouse or former spouse pursuant to a domestic relations order in settlement of marital property rights. The
Committee will allow you to transfer this Option only if both you and the transferee(s) execute the forms prescribed by the Committee, which
include the consent of the transferee(s) to be bound by this Agreement. This Option may not be transferred in any manner other than by will or
by the laws of descent or distribution or court order and may be exercised during the lifetime of you only by you, your guardian, or legal
representative, as permitted in the Plan. The terms of the Plan and this Agreement shall be binding upon the executors, administrators, heirs,
successors and assigns of you.

6.

Term of Option. This Option shall in any event expire on the expiration date set forth in the Notice of Grant, which date is ten (10) years

after the grant date (five (5) years after the grant date if this Option is designated as an ISO in the Notice of Grant and Section 5.3 of the Plan applies).

7.

Tax Consequences.  You  should  consult  a  tax  adviser  for  tax  consequences  relating  to  this  Option  in  the  jurisdiction  in  which  you  are

subject to tax. YOU SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR DISPOSING OF THE SHARES.

(a)

Exercising the Option. You will not be allowed to exercise this Option unless you make arrangements acceptable to the Company

to pay any withholding taxes that may be due as a result of the Option exercise.

(b)

Notice of Disqualifying Disposition of ISO Shares. If you sell or otherwise dispose of any of the Shares acquired pursuant to an

ISO on or before the later of (i) two (2) years after the grant date, or (ii) one year after the exercise date, you shall immediately notify the Company in writing
of such disposition. You agree that you may be subject to income tax withholding by the Company on the compensation income recognized from such early
disposition of ISO Shares by payment in cash or out of the current compensation paid to you.

8.

Withholding Taxes and Stock Withholding. Regardless of any action the Company or your actual employer (the “Employer”) takes with

respect to any or all income tax, social insurance, payroll tax, payment on account or other tax-

3

 
 
related withholding (“Tax-Related Items”), you acknowledge that the ultimate liability for all Tax-Related Items legally due by you is and remains your
responsibility and that the Company and/or the Employer (1) make no representations or undertakings regarding the treatment of any Tax-Related Items in
connection with any aspect of the Option grant, including the grant, vesting or exercise of the Option, the subsequent sale of Shares acquired pursuant to such
exercise and the receipt of any dividends; and (2) do not commit to structure the terms of the grant or any aspect of the Option to reduce or eliminate your
liability for Tax-Related Items. You acknowledge that if you are subject to Tax-Related Items in more than one jurisdiction, the Company and/or the
Employer may be required to withhold or account for Tax-Related Items in more than one jurisdiction.

Prior to exercise of the Option, you shall pay or make adequate arrangements satisfactory to the Company and/or the Employer to satisfy all withholding
and payment on account obligations of the Company and/or the Employer. In this regard, you authorize the Company and/or the Employer to withhold all
applicable Tax-Related Items legally payable by you from your wages or other cash compensation paid to you by the Company and/or the Employer. With
the Company’s consent, these arrangements may also include, if permissible under local law, (a) withholding Shares that otherwise would be issued to you
when you exercise this Option, provided that the Company only withholds the amount of Shares necessary to satisfy the minimum statutory withholding
amount, (b) having the Company withhold taxes from the proceeds of the sale of the Shares, either through a voluntary sale or through a mandatory sale
arranged by the Company (on your behalf and you hereby authorize such sales by this authorization), (c) your payment of a cash amount, or (d) any other
arrangement approved by the Company; all under such rules as may be established by the Committee and in compliance with the any insider trading or
10b-51 trading policies of the Company, if applicable; provided however, that if you are a Section 16 officer of the Company under the Exchange Act, then
the Committee (as constituted in accordance with Rule 16b-3 under the Exchange Act) shall establish the method of withholding from alternatives (a)-(d)
above, and the Committee shall establish the method prior to the Tax-Related Items withholding event. The Fair Market Value of these Shares, determined
as of the effective date of the Option exercise, will be applied as a credit against the withholding taxes. You shall pay to the Company or the Employer any
amount of Tax-Related Items that the Company or the Employer may be required to withhold as a result of your participation in the Plan or your purchase
of Shares that cannot be satisfied by the means previously described. Finally, you acknowledge that the Company has no obligation to deliver Shares to you
until you have satisfied the obligations in connection with the Tax-Related Items as described in this Section.

9.

Acknowledgement. The Company and you agree that the Option is granted under and governed by the Notice of Grant, this Agreement
and the provisions of the Plan (incorporated herein by reference). You: (i) acknowledge receipt of a copy of the Plan prospectus, (ii) represent that you have
carefully read and are familiar with their provisions, and (iii) hereby accept the Option subject to all of the terms and conditions set forth herein and those set
forth in the Plan and the Notice of Grant. You hereby agree to accept as binding, conclusive and final all decisions or interpretations of the Committee upon
any questions relating to the Plan, the Notice of Grant and the Agreement.

10.

Consent to Electronic Delivery of All Plan Documents and Disclosures. By your acceptance of this Option, you consent to the

electronic delivery of the Notice of Grant, this Agreement, account statements, Plan prospectuses required by the Securities and Exchange Commission, U.S.
financial reports of the Company, and all other documents that the Company is required to deliver to its security holders (including, without limitation, annual
reports and proxy statements) or other communications or information related to the Option. Electronic delivery may include the delivery of a link to a
Company intranet or the internet site of a third party involved in administering the Plan, the delivery of the document via e-mail or such other delivery
determined at the Company’s discretion. You acknowledge that you may receive from the Company a paper copy of any documents delivered electronically
at no cost if you contact the Company by telephone, through a postal service or electronic mail at. You further acknowledge that you will be provided with a
paper copy of any documents delivered electronically if electronic delivery fails; similarly, you understand that you must provide on request to the Company
or any designated third party a paper copy of any documents delivered electronically if electronic delivery fails. Also, you understand that your consent may
be revoked or changed, including any change in the electronic mail address to which documents are delivered (if you have provided an electronic mail
address), at any time by notifying the Company of such revised or revoked consent by telephone, postal service or electronic mail at. Finally, you understand
that you are not required to consent to electronic delivery.

11.

Compliance with Laws and Regulations. The exercise of this Option will be subject to and conditioned upon compliance by the

Company and you with all applicable state, federal and foreign laws and regulations and with all applicable requirements of any stock exchange or automated
quotation system on which the Company’s Common Stock may be listed or quoted at the time of such issuance or transfer. The Shares issued pursuant to this
Agreement shall be endorsed with appropriate legends, if any, determined by the Company.

12.

Governing  Law;  Severability.  If  one  or  more  provisions  of  this  Agreement  are  held  to  be  unenforceable  under  applicable  law,  the

parties agree to renegotiate such provision in good faith. In the event that the parties cannot reach a

4

 
 
mutually agreeable and enforceable replacement for such provision, then (i) such provision shall be excluded from this Agreement,  (ii)  the  balance  of  this
Agreement shall be interpreted as if such provision were so excluded and (iii) the balance of this Agreement shall be enforceable in accordance
with  its  terms.  This  Agreement  and  all  acts  and  transactions  pursuant  hereto  and  the  rights  and  obligations  of  the  parties  hereto  shall  be
governed, construed and interpreted in accordance with the laws of the State of Delaware, without giving effect to principles of conflicts of
law. For purposes of litigating any dispute that may arise directly or indirectly from the Plan, the Notice and this Agreement, the parties hereby
submit and consent to litigation in the exclusive jurisdiction of the State of Delaware.

13.

No Rights as Employee, Director or Consultant. Nothing in this Agreement shall affect in any manner whatsoever the right or power

of the Company, or a Parent, Subsidiary or Affiliate of the Company, to terminate your Service, for any reason, with or without Cause.

14.

Adjustment. In the event of a stock split, a stock dividend or a similar change in Company stock, the number of Shares covered by this

Option and the Exercise Price per Share may be adjusted pursuant to the Plan.

15.

Lock-Up Agreement. In connection with the initial public offering of the Company’s securities and upon request of the Company or the
underwriters managing any underwritten offering of the Company’s securities, you hereby agree not to sell, make any short sale of, loan, grant any Option for
the purchase of, or otherwise dispose of any securities of the Company however and whenever acquired (other than those included in the registration) without
the prior written consent of the Company or such underwriters, as the case may be, for such period of time (not to exceed one hundred eighty (180) days)
from the effective date of such registration as may be requested by the Company or such managing underwriters and to execute an agreement reflecting the
foregoing as may be requested by the underwriters at the time of the public offering; provided however that, if during the last seventeen (17) days of the
restricted period the Company issues an earnings release or material news or a material event relating to the Company occurs, or prior to the expiration of the
restricted period the Company announces that it will release earnings results during the sixteen (16)-day period beginning on the last day of the restricted
period, then, upon the request of the managing underwriter, to the extent required by any FINRA rules, the restrictions imposed by this Section shall continue
to apply until the end of the third trading day following the expiration of the fifteen (15)-day period beginning on the issuance of the earnings release or the
occurrence of the material news or material event. In no event will the restricted period extend beyond two hundred sixteen (216) days after the effective
date of the registration statement.

16.

Award Subject to Company Clawback or Recoupment. To the extent permitted by applicable law, the Option shall be subject to
clawback or recoupment pursuant to any compensation clawback or recoupment policy adopted by the Board or required by law during the term of your
employment or other Service that is applicable to you. In addition to any other remedies available under such policy, applicable law may require the
cancellation of your Option (whether vested or unvested) and the recoupment of any gains realized with respect to your Option.

17.

Entire Agreement; Enforcement of Rights. This Agreement, the Plan and the Notice constitute the entire agreement and understanding

of the parties relating to the subject matter herein and supersede all prior discussions between them. Any prior agreements, commitments or negotiations
concerning this Option are superseded. No modification of or amendment to this Agreement, nor any waiver of any rights under this Agreement, shall be
effective unless in writing and signed by the parties to this Agreement. The failure by either party to enforce any rights under this Agreement shall not be
construed as a waiver of any rights of such party.

BY ACCEPTING THIS OPTION, YOU AGREE TO ALL OF THE TERMS AND CONDITIONS DESCRIBED ABOVE AND IN THE PLAN.

5

 
 
EXHIBIT 10.5

SIERRA ONCOLOGY, INC.

2018 EQUITY INDUCEMENT PLAN

ADOPTED BY THE COMPENSATION COMMITTEE 
OF THE BOARD OF DIRECTORS: SEPTEMBER 2018
FIRST AMENDMENT BY THE BOARD OF DIRECTORS: JUNE 2020
SECOND AMENDMENT BY THE COMPENSATION COMMITTEE 
OF THE BOARD OF DIRECTORS: FEBRUARY 2021

1.
PURPOSE.  The  purpose  of  this  Plan  is  to  provide  incentives  to  attract,  retain  and  motivate  eligible  persons  whose  present  and
potential  contributions  are  important  to  the  success  of  the  Company,  and  any  Parents  and  Subsidiaries  that  exist  now  or  in  the  future,  by
offering them an opportunity to participate in the Company’s future performance through the grant of Awards. Capitalized terms not defined
elsewhere in the text are defined in Section 21.

2.

SHARES SUBJECT TO THE PLAN.

2.1

Number of Shares Available.  Subject  to  Section  2.4  and  any  other  applicable  provisions  hereof,  the  total  number  of

Shares reserved and available for grant and issuance pursuant to this Plan is 1,037,500.

2.2

Lapsed, Returned Awards. Shares subject to Awards, and Shares issued under the Plan under any Award, will again be
available for grant and issuance in connection with subsequent Awards under this Plan to the extent such Shares: (a) are subject to issuance
upon  exercise  of  an  Option  granted  under  this  Plan  but  which  cease  to  be  subject  to  the  Option  for  any  reason  other  than  exercise  of  the
Option; (b) are subject to Awards granted under this Plan that are forfeited or are repurchased by the Company at the original issue price or
(c) are subject to Awards granted under this Plan that otherwise terminate without such Shares being issued. To the extent an Award under the
Plan is paid out in cash rather than Shares, such cash payment will not result in reducing the number of Shares available for issuance under
the Plan. Shares used to pay the exercise price of an Award or withheld to satisfy the tax withholding obligations related to an Award will
become available for future grant or sale under the Plan.

2.3

Minimum Share Reserve. At all times the Company shall reserve and keep available a sufficient number of Shares as

shall be required to satisfy the requirements of all outstanding Awards granted under this Plan.

2.4

Adjustment of Shares. If the number of outstanding Shares is changed by a stock dividend, extraordinary dividends or
distributions (whether in cash, shares or other property, other than a regular cash dividend) recapitalization, stock split, reverse stock split,
subdivision, combination, reclassification, spin- off or similar change in the capital structure of the Company, without consideration, then (a)
the number of Shares reserved for issuance and future grant under the Plan set forth in Section 2.1, (b) the Exercise Prices of and number of
Shares subject to outstanding Options and (c) the number of Shares subject to other outstanding Awards, shall be proportionately adjusted,
subject to any required action by the Board or the stockholders of the Company and in compliance with applicable securities laws; provided
that fractions of a Share will not be issued.

3.
ELIGIBILITY. Awards may be granted only to a person who, at the time of granting of the Award by the Committee: (a) has been
hired as an Employee by the Company or any Subsidiary and such Award is a material inducement to such person being hired; (b) has been
rehired as an Employee following a bona

 
 
fide  period  of  interruption  of  employment  with  the  Company  or  any  Subsidiary;  or  (c)  has  become  an  Employee  of  the  Company  or  any
Subsidiary in connection with a merger or acquisition.

4.

ADMINISTRATION.

4.1

Committee  Composition;  Authority.  This  Plan  will  be  administered  by  the  Committee  or  by  the  Board  acting  as  the
Committee. Subject to the general purposes, terms and conditions of this Plan, and to the direction of the Board, the Committee will have full
power to implement and carry out this Plan. Notwithstanding the foregoing, the grant of any Award will not be effective unless: (i) if the
grant is made by the Board, then it must be approved by a majority of the Outside Directors on the Board; and (ii) if the grant is made by the
Committee, then the Committee must be comprised solely of Outside Directors (except as otherwise permitted under applicable rules). The
Committee will have the authority to:

pursuant to this Plan;

(a)

(b)

(c)

construe  and  interpret  this  Plan,  any  Award  Agreement  and  any  other  agreement  or  document  executed

prescribe, amend and rescind rules and regulations relating to this Plan or any Award;

select persons to receive Awards;

(d)

determine  the  form  and  terms  and  conditions,  not  inconsistent  with  the  terms  of  the  Plan,  of  any  Award
granted hereunder. Such terms and conditions include, but are not limited to, the exercise price, the time or times when Awards may vest and
be exercised (which may be based on performance criteria) or settled, any vesting acceleration or waiver of forfeiture restrictions, the method
to satisfy tax withholding obligations or any other tax liability legally due and any restriction or limitation regarding any Award or the Shares
relating thereto, based in each case on such factors as the Committee will determine;

(e)

(f)

determine the number of Shares or other consideration subject to Awards;

determine  the  Fair  Market  Value  in  good  faith  and  interpret  the  applicable  provisions  of  this  Plan  and  the

definition of Fair Market Value in connection with circumstances that impact the Fair Market Value, if necessary;

other Awards under this Plan or any other incentive or compensation plan of the Company or any Parent or Subsidiary of the Company;

(g)

determine whether Awards will be granted singly, in combination with, in tandem with, or as alternatives to,

Agreement;

(h)

(i)

(j)

(k)

(l)

grant waivers of Plan or Award conditions;

determine the vesting, exercisability and payment of Awards;

correct any defect, supply any omission or reconcile any inconsistency in this Plan, any Award or any Award

determine whether an Award has been earned;

reduce or waive any criteria with respect to Performance Factors;

2

 
adjust  Performance  Factors  to  take  into  account  changes  in  law  and  accounting  or  tax  rules  as  the
Committee deems necessary or appropriate to reflect the impact of extraordinary or unusual items, events or circumstances to avoid windfalls
or hardships;

(m)

adopt terms and conditions, rules and/or procedures (including the adoption of any subplan under this Plan)
relating  to  the  operation  and  administration  of  the  Plan  to  accommodate  requirements  of  local  law  and  procedures  outside  of  the  United
States; and

(n)

(o)

make all other determinations necessary or advisable for the administration of this Plan.

4.2

Committee Interpretation and Discretion. Any determination made by the Committee with respect to any Award shall
be made in its sole discretion at the time of grant of the Award or, unless in contravention of any express term of the Plan or Award, at any
later time, and such determination shall be final and binding on the Company and all persons having an interest in any Award under the Plan.
Any  dispute  regarding  the  interpretation  of  the  Plan  or  any  Award  Agreement  shall  be  submitted  by  the  Employee  or  Company  to  the
Committee for review. The resolution of such a dispute by the Committee shall be final and binding on the Company and the Employee. The
Committee  may  delegate  to  one  or  more  executive  officers  the  authority  to  review  and  resolve  disputes  with  respect  to  Awards  held  by
Employees who are not Insiders, and such resolution shall be final and binding on the Company and the Employee.

4.3

Section 16 of the Exchange Act. Awards granted to Employees who are subject to Section 16 of the Exchange Act must

be approved by two or more “non-employee directors” (as defined in the regulations promulgated under Section 16 of the Exchange Act).

4.4

Documentation. The Award Agreement for a given Award, the Plan and any other documents may be delivered to, and
accepted  by,  an  Employee  or  any  other  person  in  any  manner  (including  electronic  distribution  or  posting)  that  meets  applicable  legal
requirements.

4.5

Foreign Award Recipients. Notwithstanding any provision of the Plan to the contrary, in order to comply with the laws
and practices in other countries in which the Company and its Subsidiaries operate or have employees eligible for Awards, the Committee, in
its sole discretion, shall have the power and authority to: (a) determine which Subsidiaries and Affiliates shall be covered by the Plan; (b)
determine  which  Employees  outside  the  United  States  are  eligible  to  participate  in  the  Plan;  (c)  modify  the  terms  and  conditions  of  any
Award granted to individuals outside the United States or foreign nationals to comply with applicable foreign laws, policies, customs and
practices;  (d)  establish  subplans  and  modify  exercise  procedures  and  other  terms  and  procedures,  to  the  extent  the  Committee  determines
such actions to be necessary or advisable (and such subplans and/or modifications shall be attached to this Plan as appendices); provided,
however, that no such subplans and/or modifications shall increase the share limitations contained in the Plan; and (e) take any action, before
or  after  an  Award  is  made,  that  the  Committee  determines  to  be  necessary  or  advisable  to  obtain  approval  or  comply  with  any  local
governmental regulatory exemptions or approvals. Notwithstanding the foregoing, the Committee may not take any actions hereunder, and no
Awards shall be granted, that would violate the Exchange Act or any other applicable United States securities law, the Code, or any other
applicable United States governing statute or law.

5.
OPTIONS.  An  Option  is  the  right  but  not  the  obligation  to  purchase  a  Share,  subject  to  certain  conditions,  if  applicable.  The
Committee may grant Options to eligible Employees and will determine the number of Shares subject to the Option, the Exercise Price of the
Option,  the  period  during  which  the  Option  may  vest  and  be  exercised,  and  all  other  terms  and  conditions  of  the  Option,  subject  to  the
following terms of this section.

3

 
5.1

Option Grant. Each Option granted under this Plan will be a Nonqualified Stock Option (“NSO”). An Option may be,
but  need  not  be,  awarded  upon  satisfaction  of  such  Performance  Factors  during  any  Performance  Period  as  are  set  out  in  advance  in  the
Employee’s individual Award Agreement. If the Option is being earned upon the satisfaction of Performance Factors, then the Committee
will:  (a)  determine  the  nature,  length  and  starting  date  of  any  Performance  Period  for  each  Option;  and  (b)  select  from  among  the
Performance  Factors  to  be  used  to  measure  the  performance,  if  any.  Performance  Periods  may  overlap  and  Employees  may  participate
simultaneously with respect to Options that are subject to different performance goals and other criteria.

5.2

Date of Grant.  The  date  of  grant  of  an  Option  will  be  the  date  on  which  the  Committee  makes  the  determination  to
grant  such  Option,  or  a  specified  future  date.  The  Award  Agreement  and  a  copy  of  this  Plan  will  be  delivered  to  the  Employee  within  a
reasonable time after the granting of the Option.

5.3

Exercise Period.  Options  may  be  vested  and  exercisable  within  the  times  or  upon  the  conditions  as  set  forth  in  the
Award Agreement governing such Option; provided, however, that no Option will be exercisable after the expiration of ten (10) years from
the date the Option is granted. The Committee also may provide for Options to become vested or exercisable at one time or from time to
time, periodically or otherwise, in such number of Shares or percentage of Shares as the Committee determines.

5.4

Exercise Price.  The  Exercise  Price  of  an  Option  will  be  determined  by  the  Committee  when  the  Option  is  granted;
provided that: the Exercise Price of an Option will be not less than one hundred percent (100%) of the Fair Market Value of the Shares on the
date of grant. Payment for the Shares purchased may be made in accordance with Section 7 and the Award Agreement and in accordance
with any procedures established by the Company.

5.5

Method of Exercise. Any Option granted hereunder will be vested and exercisable according to the terms of the Plan
and at such times and under such conditions as determined by the Committee and set forth in the Award Agreement. An Option may not be
exercised for a fraction of a Share. An Option will be deemed exercised when the Company receives: (a) notice of exercise (in such form as
the Committee may specify from time to time) from the person entitled to exercise the Option (and/or via electronic execution through the
authorized  third  party  administrator),  and  (b)  full  payment  for  the  Shares  with  respect  to  which  the  Option  is  exercised  (together  with
applicable  withholding  taxes).  Full  payment  may  consist  of  any  consideration  and  method  of  payment  authorized  by  the  Committee  and
permitted by the Award Agreement and the Plan. Shares issued upon exercise of an Option will be issued in the name of the Employee. Until
the  Shares  are  issued  (as  evidenced  by  the  appropriate  entry  on  the  books  of  the  Company  or  of  a  duly  authorized  transfer  agent  of  the
Company), no right to vote or receive dividends or any other rights as a stockholder will exist with respect to the Shares, notwithstanding the
exercise of the Option. The Company will issue (or cause to be issued) such Shares promptly after the Option is exercised. No adjustment
will be made for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Section 2.4
of the Plan. Exercising an Option in any manner will decrease the number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is exercised.

5.6

Termination of Service. If the Employee’s Service terminates for any reason except for Cause or the Employee’s death
or  Disability,  then  the  Employee  may  exercise  such  Employee’s  Options  (only  to  the  extent  that  such  Options  are  exercisable  by  the
Employee  on  the  date  Employee’s  Service  terminates)  during  the  period  ending  no  later  than  three  (3)  months  after  the  date  Employee’s
Service  terminates  (or  such  shorter  or  longer  time  period  as  may  be  determined  by  the  Committee),  but  in  any  event  no  later  than  the
expiration date of the Options.

4

 
(a)

Death. If the Employee’s Service terminates because of the Employee’s death (or the Employee dies within
three (3) months after Employee’s Service terminates other than for Cause or because of the Employee’s Disability), then the Employee’s
Options may be exercised only to the extent that such Options would have been exercisable by the Employee on the date Employee’s Service
terminates and must be exercised by the Employee’s legal representative, or authorized assignee, no later than twelve (12) months after the
date Employee’s Service terminates (or such shorter time period or longer time period as may be determined by the Committee), but in any
event no later than the expiration date of the Options.

(b)

Disability. If the Employee’s Service terminates because of the Employee’s Disability, then the Employee’s
Options may be exercised only to the extent that such Options would have been exercisable by the Employee on the date Employee’s Service
terminates and must be exercised by the Employee (or the Employee’s legal representative or authorized assignee) no later than twelve (12)
months after the date Employee’s Service terminates (or such shorter or longer time period as may be determined by the Committee, but in
any event no later than the expiration date of the Options.

(c)

Cause. If the Employee is terminated for Cause, then Employee’s Options shall expire on such Employee’s
date of termination of Service, or at such later time and on such conditions as are determined by the Committee, but in any event no later than
the  expiration  date  of  the  Options.  Unless  otherwise  provided  in  the  Award  Agreement  or  other  agreement  between  the  Company  and
Employee, Cause shall have the meaning set forth in this Plan.

5.7

Limitations  on  Exercise.  The  Committee  may  specify  a  minimum  number  of  Shares  that  may  be  purchased  on  any
exercise of an Option, provided that such minimum number will not prevent any Employee from exercising the Option for the full number of
Shares for which it is then exercisable.

5.8

Modification, Extension or Renewal. The Committee may modify, extend or renew outstanding Options and authorize
the grant of new Options in substitution therefor, provided that any such action may not, without the written consent of an Employee, impair
any of such Employee’s rights under any Option previously granted.

6.
Shares that may be settled in cash, or by issuance of those Shares. All RSUs shall be made pursuant to an Award Agreement.

RESTRICTED  STOCK  UNITS.  A  Restricted  Stock  Unit  (“RSU”)  is  an  award  to  an  eligible  Employee  covering  a  number  of

6.1

Terms of RSUs. The Committee will determine the terms of an RSU including, without limitation: (a) the number of
Shares subject to the RSU; (b) the time or times during which the RSU may be settled; (c) the consideration to be distributed on settlement;
and (d) the effect of the Employee’s termination of Service on each RSU. An RSU may be awarded upon satisfaction of such performance
goals based on Performance Factors during any Performance Period as are set out in advance in the Employee’s Award Agreement. If the
RSU is being earned upon satisfaction of Performance Factors, then the Committee will: (x) determine the nature, length and starting date of
any Performance Period for the RSU; (y) select from among the Performance Factors to be used to measure the performance, if any; and (z)
determine  the  number  of  Shares  deemed  subject  to  the  RSU.  Performance  Periods  may  overlap  and  participants  may  participate
simultaneously with respect to RSUs that are subject to different Performance Periods and different performance goals and other criteria.

6.2

Form  and  Timing  of  Settlement.  Payment  of  earned  RSUs  shall  be  made  as  soon  as  practicable  after  the  date(s)
determined by the Committee and set forth in the Award Agreement. The Committee, in its sole discretion, may settle earned RSUs in cash,
Shares, or a combination of both. The Committee may also permit a Employee to defer payment under an RSU to a date or dates after the
RSU is

5

 
earned provided that the terms of the RSU and any deferral satisfy the requirements of Section 409A of the Code.

6.3

Termination of Service. Except as may be set forth in the Employee’s Award Agreement, vesting ceases on such date

Employee’s Service terminates (unless determined otherwise by the Committee).

7.
PAYMENT FOR SHARE PURCHASES. Payment from an Employee for Shares purchased pursuant to this Plan may be made in
cash  or  by  check  or,  where  expressly  approved  for  the  Employee  by  the  Committee  and  where  permitted  by  law  (and  to  the  extent  not
otherwise set forth in the applicable Award Agreement):

(a)

(b)

by cancellation of indebtedness of the Company to the Employee;

by surrender of shares of the Company held by the Employee that have a Fair Market Value on the date of

surrender equal to the aggregate exercise price of the Shares as to which said Award will be exercised or settled;

Company or a Parent or Subsidiary of the Company;

(c)

by waiver of compensation due or accrued to the Employee for services rendered or to be rendered to the

program implemented by the Company in connection with the Plan;

(d)

by consideration received by the Company pursuant to a broker-assisted or other form of cashless exercise

(e)

(f)

by any combination of the foregoing; or

by any other method of payment as is permitted by applicable law.

8.

WITHHOLDING TAXES.

8.1

Withholding  Generally.  Whenever  Shares  are  to  be  issued  in  satisfaction  of  Awards  granted  under  this  Plan  or  the
applicable tax event occurs, the Company may require the Employee to remit to the Company, or to the Parent or Subsidiary employing the
Employee, an amount sufficient to satisfy applicable U.S. federal, state, local and international withholding tax requirements or any other tax
or social insurance liability legally due from the Employee prior to the delivery of Shares pursuant to exercise or settlement of any Award.
Whenever  payments  in  satisfaction  of  Awards  granted  under  this  Plan  are  to  be  made  in  cash,  such  payment  will  be  net  of  an  amount
sufficient to satisfy applicable U.S. federal, state, local and international withholding tax or social insurance requirements or any other tax
liability legally due from the Employee. The Fair Market Value of the Shares will be determined as of the date that the taxes are required to
be withheld and such Shares will be valued based on the value of the actual trade or, if there is none, the Fair Market Value of the Shares as
of the previous trading day.

8.2

Stock Withholding. The Committee, in its sole discretion and pursuant to such procedures as it may specify from time
to time and to limitations of local law, may require or permit an Employee to satisfy such tax withholding obligation or any other tax liability
legally  due  from  the  Employee,  in  whole  or  in  part  by  (without  limitation)  (a)  paying  cash,  (b)  electing  to  have  the  Company  withhold
otherwise deliverable cash or Shares having a Fair Market Value equal to up to the maximum statutory amount permitted to be withheld, (c)
delivering to the Company already-owned Shares having a Fair Market Value equal to up to the maximum statutory amount permitted to be
withheld or (d) withholding from the proceeds of the sale of otherwise deliverable Shares acquired pursuant to an Award either through a
voluntary sale or through a mandatory sale arranged by the Company.

6

 
TRANSFERABILITY.  Unless  determined  otherwise  by  the  Committee,  an  Award  may  not  be  sold,  pledged,  assigned,
9.
hypothecated, transferred, or disposed of in any manner other than by will or by the laws of descent or distribution. If the Committee makes
an  Award  transferable,  including,  without  limitation,  by  instrument  to  an  inter  vivos  or  testamentary  trust  in  which  the  Awards  are  to  be
passed to beneficiaries upon the death of the trustor (settlor) or by gift or by domestic relations order to a Permitted Transferee, such Award
will  contain  such  additional  terms  and  conditions  as  the  Committee  deems  appropriate.  All  Awards  shall  be  exercisable:  (a)  during  the
Employee’s lifetime only by (i) the Employee, or (ii) the Employee’s guardian or legal representative; (b) after the Employee’s death, by the
legal representative of the Employee’s heirs or legatees; and (c) by a Permitted Transferee

10.

PRIVILEGES OF STOCK OWNERSHIP; RESTRICTIONS ON SHARES.

10.1

Voting and Dividends. No Employee will have any of the rights of a stockholder with respect to any Shares until the
Shares are issued to the Employee, except for any Dividend Equivalent Rights permitted by an applicable Award Agreement. Any Dividend
Equivalent Rights shall be subject to the same vesting or performance conditions as the underlying Award. In addition, the Committee may
provide  that  any  Dividend  Equivalent  Rights  permitted  by  an  applicable  Award  Agreement  shall  be  deemed  to  have  been  reinvested  in
additional Shares or otherwise reinvested. After Shares are issued to the Employee, the Employee will be a stockholder and have all the rights
of a stockholder with respect to such Shares, including the right to vote and receive all dividends or other distributions made or paid with
respect to such Shares; provided, that if such Shares are Unvested Shares, then any new, additional or different securities the Employee may
become entitled to receive with respect to such Shares by virtue of a stock dividend, stock split or any other change in the corporate or capital
structure of the Company will be subject to the same restrictions as the Unvested Shares; provided, further, that the Employee will have no
right  to  retain  such  stock  dividends  or  stock  distributions  with  respect  to  Shares  that  are  repurchased  at  the  Employee’s  Exercise  Price,
pursuant to Section 10.2.

10.2

Restrictions on Shares. At the discretion of the Committee, the Company may reserve to itself and/or its assignee(s) a
right  to  repurchase  (a  “Right  of  Repurchase”)  a  portion  of  any  or  all  Unvested  Shares  held  by  an  Employee  following  such  Employee’s
termination of Service at any time within ninety (90) days (or such longer or shorter time determined by the Committee) after the later of the
date Employee’s Service terminates and the date the Employee purchases Shares under this Plan, for cash and/or cancellation of purchase
money indebtedness, at the Employee’s Exercise Price.

11.
CERTIFICATES.  All  Shares  or  other  securities  (whether  or  not  certificated)  delivered  under  this  Plan  will  be  subject  to  such
stock  transfer  orders,  legends  and  other  restrictions  as  the  Committee  may  deem  necessary  or  advisable,  including  restrictions  under  any
applicable U.S. federal, state or foreign securities law, or any rules, regulations and other requirements of the SEC or any stock exchange or
automated quotation system upon which the Shares may be listed or quoted and any non-U.S. exchange controls or securities law restrictions
to which the Shares are subject.

12.
ESCROW;  PLEDGE  OF  SHARES.  To  enforce  any  restrictions  on  an  Employee’s  Shares,  the  Committee  may  require  the
Employee  to  deposit  all  certificates  representing  Shares,  together  with  stock  powers  or  other  instruments  of  transfer  approved  by  the
Committee,  appropriately  endorsed  in  blank,  with  the  Company  or  an  agent  designated  by  the  Company  to  hold  in  escrow  until  such
restrictions have lapsed or terminated, and the Committee may cause a legend or legends referencing such restrictions to be placed on the
certificates. Any Employee who is permitted to execute a promissory note as partial or full consideration for the purchase of Shares under
this Plan will be required to pledge and deposit with the Company all or part of the Shares so purchased as collateral to secure the payment of
the Employee’s obligation to the Company under the promissory note; provided, however, that the Committee may require or accept other or
additional forms of collateral to secure the payment of such obligation and, in any event,

7

 
the Company will have full recourse against the Employee under the promissory note notwithstanding any pledge of the Employee’s Shares
or  other  collateral.  In  connection  with  any  pledge  of  the  Shares,  the  Employee  will  be  required  to  execute  and  deliver  a  written  pledge
agreement in such form as the Committee will from time to time approve. The Shares purchased with the promissory note may be released
from the pledge on a pro rata basis as the promissory note is paid.

13.
SECURITIES LAW AND OTHER REGULATORY COMPLIANCE. An Award will not be effective unless such Award is in
compliance  with  all  applicable  U.S.  and  foreign  federal  and  state  securities  and  exchange  control  laws,  rules  and  regulations  of  any
governmental body, and the requirements of any stock exchange or automated quotation system upon which the Shares may then be listed or
quoted, as they are in effect on the date of grant of the Award and also on the date of exercise or other issuance. Notwithstanding any other
provision in this Plan, the Company will have no obligation to issue or deliver certificates for Shares under this Plan prior to: (a) obtaining
any approvals from governmental agencies that the Company determines are necessary or advisable; and/or (b) completion of any registration
or  other  qualification  of  such  Shares  under  any  state  or  federal  or  foreign  law  or  ruling  of  any  governmental  body  that  the  Company
determines  to  be  necessary  or  advisable.  The  Company  will  be  under  no  obligation  to  register  the  Shares  with  the  SEC  or  to  effect
compliance with the registration, qualification or listing requirements of any foreign or state securities laws, exchange control laws, stock
exchange or automated quotation system, and the Company will have no liability for any inability or failure to do so.

14.
NO OBLIGATION TO EMPLOY. The Employee’s participation in the Plan is voluntary. Nothing in this Plan or any Award
granted under this Plan will confer or be deemed to confer on any Employee any right to continue in the employ of, or to continue any other
relationship with, the Company or any Parent, Subsidiary or Affiliate or limit in any way the right of the Company or any Parent, Subsidiary
or Affiliate to terminate Employee’s employment or other relationship at any time.

15.
CORPORATE TRANSACTIONS. In the event of a Corporate Transaction any or all outstanding Awards may be assumed or
replaced by the successor corporation, which assumption or replacement shall be binding on all Employees. In the alternative, the successor
corporation may substitute equivalent Awards or provide substantially similar consideration to Employees as was provided to stockholders
(after taking into account the existing provisions of the Awards). The successor corporation may also issue, in place of outstanding Shares of
the Company held by the Employee, substantially similar shares, cash or other property subject to repurchase restrictions no less favorable to
the  Employee.  In  the  event  such  successor  or  acquiring  corporation  (if  any)  refuses  to  assume,  convert,  replace  or  substitute  Awards,  as
provided above, pursuant to a Corporate Transaction, then notwithstanding any other provision in this Plan to the contrary, such Awards shall
have their vesting accelerate as to all shares subject to such Award (and any applicable rights of repurchase shall fully lapse) immediately
prior  to  the  Corporate  Transaction.  In  addition,  in  the  event  such  successor  or  acquiring  corporation  (if  any)  refuses  to  assume,  convert,
replace or substitute Awards, as provided above, pursuant to a Corporate Transaction, the Committee will (i) notify the Employee in writing
or electronically that such Award will, if applicable, be exercisable for a period of time determined by the Committee in its sole discretion,
and  such  Award  will  terminate  upon  the  earlier  of  the  expiration  of  such  period  or  immediately  prior  to  the  Corporate  Transaction  or  (ii)
provide that each Award shall be cancelled immediately upon the occurrence of the Corporate Transaction in exchange for a payment in cash
or securities in an amount equal to (A) the excess of the consideration paid per Share in the Corporate Transaction over the exercise price or
purchase price (if any) per Share subject to the Award multiplied by (B) the number of Shares subject to the Award. Awards need not be
treated similarly in a Corporate Transaction

16.
TERM OF PLAN/GOVERNING LAW.  Unless  earlier  terminated  as  provided  herein,  this  Plan  will  become  effective  on  the
Effective Date and will terminate on the later of ten (10) years from the date this Plan is adopted by the Committee or the date additional
Shares are added to the Plan by the Committee.

8

 
This  Plan  and  all  Awards  granted  hereunder  shall  be  governed  by  and  construed  in  accordance  with  the  laws  of  the  State  of  Delaware
(excluding its conflict of law rules).

17.
AMENDMENT OR TERMINATION OF PLAN. The Board or Committee may at any time terminate or amend this Plan in
any respect, including, without limitation, amendment of any form of Award Agreement or instrument to be executed pursuant to this Plan;
provided, however, that the Board or Committee will not, without the approval of the stockholders of the Company, amend this Plan in any
manner that requires such stockholder approval; provided further, that an Employee’s Award shall be governed by the version of this Plan
then in effect at the time such Award was granted.

18.
NONEXCLUSIVITY OF THE PLAN. Neither the adoption of this Plan by the Committee nor any provision of this Plan will be
construed as creating any limitations on the power of the Board or the Committee to adopt such additional compensation arrangements as it
may  deem  desirable,  including,  without  limitation,  the  granting  of  stock  awards  and  bonuses  otherwise  than  under  this  Plan,  and  such
arrangements may be either generally applicable or applicable only in specific cases.

19.
from time to time covering transactions in the Company’s securities by Employees, officers and/or directors of the Company.

INSIDER TRADING POLICY. Each Employee who receives an Award shall comply with any policy adopted by the Company

ALL AWARDS SUBJECT TO COMPANY CLAWBACK OR RECOUPMENT POLICY. All Awards, subject to applicable
20.
law,  shall  be  subject  to  clawback  or  recoupment  pursuant  to  any  compensation  clawback  or  recoupment  policy  adopted  by  the  Board  or
required  by  law  during  the  term  of  Employee’s  employment  or  other  service  with  the  Company  that  is  applicable  to  executive  officers,
employees,  directors  or  other  service  providers  of  the  Company,  and  in  addition  to  any  other  remedies  available  under  such  policy  and
applicable law, may require the cancellation of outstanding Awards and the recoupment of any gains realized with respect to Awards.

21.
meanings:

DEFINITIONS.  As  used  in  this  Plan,  and  except  as  elsewhere  defined  herein,  the  following  terms  will  have  the  following

21.1

“Affiliate” means (i) any entity that, directly or indirectly, is controlled by, controls or is under common control with,
the  Company  and  (ii)  any  entity  in  which  the  Company  has  a  significant  equity  interest,  in  either  case  as  determined  by  the  Committee,
whether now or hereafter existing.

21.2

“Award” means any award under this Plan, including any Option or Restricted Stock Unit.

21.3

“Award Agreement” means, with respect to each Award, the written or electronic agreement between the Company
and  the  Employee  setting  forth  the  terms  and  conditions  of  the  Award,  and  country-specific  appendix  thereto  for  grants  to  non-U.S.
Employees, which shall be in substantially a form (which need not be the same for each Employee) that the Committee (or in the case of
Award agreements that are not used for Insiders, the Committee’s delegate(s)) has from time to time approved, and will comply with and be
subject to the terms and conditions of this Plan.

21.4

“Board” means the Board of Directors of the Company.

21.5

“Cause” means (a) Employee’s conviction (including a guilty plea or plea of nolo contendere) of any felony or any
other  crime  involving  fraud,  dishonesty  or  moral  turpitude;  (b)  Employee’s  commission  or  attempted  commission  of  or  participation  in  a
fraud or act of dishonesty or misrepresentation against the Company that results (or could reasonably be expected to result) in material harm
or injury to the business or reputation of the Company; (c) Employee’s material violation of any contract or agreement

9

 
between Employee and the Company, or of any Company policy, or of any statutory duty Employee owes to the Company; or (d) Employee’s
conduct that constitutes gross insubordination, incompetence or habitual neglect of duties and that results in (or could reasonably be expected
to  have  resulted  in)  material  harm  to  the  business  or  reputation  of  the  Company.  The  determination  as  to  whether  an  Employee  is  being
terminated for Cause shall be made in good faith by the Company and shall be final and binding on the Employee. The foregoing definition
does not in any way limit the Company’s ability to terminate an Employee’s employment or consulting relationship at any time as provided in
Section  14  above,  and  the  term  “Company”  will  be  interpreted  to  include  any  Subsidiary  or  Parent,  as  appropriate.  Notwithstanding  the
foregoing, the foregoing definition of “Cause” may, in part or in whole, be modified or replaced in each individual employment agreement or
Award Agreement with any Employee, provided that such document supersedes the definition provided in this Section 21.5.

21.6

“Code”  means  the  United  States  Internal  Revenue  Code  of  1986,  as  amended,  and  the  regulations  promulgated

thereunder.

21.7

21.8

21.9

“Committee” means the Compensation Committee of the Board.

“Common Stock” means the common stock of the Company.

“Company” means Sierra Oncology, Inc., or any successor corporation.

21.10

“Corporate Transaction”  means  the  occurrence  of  any  of  the  following  events:  (a)  any  “Person”  (as  such  term  is
used  in  Sections  13(d)  and  14(d)  of  the  Exchange  Act)  becomes  the  “beneficial  owner”  (as  defined  in  Rule  13d-3  of  the  Exchange  Act),
directly or indirectly, of securities of the Company representing more than fifty percent (50%) of the total voting power represented by the
Company’s  then-  outstanding  voting  securities;  provided,  however,  that  for  purposes  of  this  subclause  (a)  the  acquisition  of  additional
securities  by  any  one  Person  who  is  considered  to  own  more  than  fifty  percent  (50%)  of  the  total  voting  power  of  the  securities  of  the
Company  will  not  be  considered  a  Corporate  Transaction;  (b)  the  consummation  of  the  sale  or  disposition  by  the  Company  of  all  or
substantially all of the Company’s assets; (c) the consummation of a merger or consolidation of the Company with any other corporation,
other  than  a  merger  or  consolidation  which  would  result  in  the  voting  securities  of  the  Company  outstanding  immediately  prior  thereto
continuing to represent (either by remaining outstanding or by being converted into voting securities of the surviving entity or its parent) at
least fifty percent (50%) of the total voting power represented by the voting securities of the Company or such surviving entity or its parent
outstanding  immediately  after  such  merger  or  consolidation;  (d)  any  other  transaction  which  qualifies  as  a  “corporate  transaction”  under
Section  424(a)  of  the  Code  wherein  the  stockholders  of  the  Company  give  up  all  of  their  equity  interest  in  the  Company  (except  for  the
acquisition, sale or transfer of all or substantially all of the outstanding shares of the Company) or (e) a change in the effective control of the
Company that occurs on the date that a majority of members of the Board are replaced during any twelve (12) month period by members of
the Board whose appointment or election is not endorsed by as majority of the members of the Board prior to the date of such appointment or
election. For purpose of this subclause (e), if any Person is considered to be in effective control of the Company, the acquisition of additional
control of the Company by the same Person will not be considered a Corporate Transaction. For purposes of this definition, Persons will be
considered  to  be  acting  as  a  group  if  they  are  owners  of  a  corporation  that  enters  into  a  merger,  consolidation,  purchase  or  acquisition  of
stock, or similar business transaction with the Company. Notwithstanding the foregoing, to the extent that any amount constituting deferred
compensation (as defined in Section 409A of the Code) would become payable under this Plan by reason of a Corporate Transaction, such
amount shall become payable only if the event constituting a Corporate Transaction would also qualify as a change in ownership or effective
control  of  the  Company  or  a  change  in  the  ownership  of  a  substantial  portion  of  the  assets  of  the  Company,  each  as  defined  within  the
meaning of Code Section 409A, as it has been and may be amended from time to time, and any proposed or final

10

 
Treasury Regulations and IRS guidance that has been promulgated or may be promulgated thereunder from time to time.

21.11

“Director” means a member of the Board.

21.12

“Disability” means in the case of incentive stock options, total and permanent disability as defined in Section 22(e)
(3) of the Code and in the case of other Awards, that the Employee is unable to engage in any substantial gainful activity by reason of any
medically  determinable  physical  or  mental  impairment  that  can  be  expected  to  result  in  death  or  can  be  expected  to  last  for  a  continuous
period of not less than 12 months.

21.13

“Dividend  Equivalent  Right”  means  the  right  of  an  Employee,  granted  at  the  discretion  of  the  Committee  or  as
otherwise provided by the Plan or an Award Agreement, to receive a credit for the account of such Employee in an amount equal to the cash,
stock or other property dividends in amounts equal equivalent to cash, stock or other property dividends for each Share represented by an
Award held by such Employee.

21.14

“Effective Date” means September 20, 2018.

21.15

“Employee”  means  any  person,  including  Officers,  providing  services  as  an  employee  to  the  Company  or  any
Parent, Subsidiary or Affiliate. Neither service as a director nor payment of a director’s fee by the Company will be sufficient to constitute
“employment” by the Company.

21.16

“Exchange Act” means the United States Securities Exchange Act of 1934, as amended.

21.17
upon exercise of an Option.

“Exercise Price”  means,  with  respect  to  an  Option,  the  price  at  which  a  holder  may  purchase  the  Shares  issuable

21.18

“Fair Market Value” means, as of any date, the value of a share of the Company’s Common Stock determined as

follows:

if  such  Common  Stock  is  publicly  traded  and  is  then  listed  on  a  national  securities  exchange,  its  closing
price on the date of determination on the principal national securities exchange on which the Common Stock is listed or admitted to trading
as reported in The Wall Street Journal or such other source as the Board or the Committee deems reliable;

(a)

if such Common Stock is publicly traded but is neither listed nor admitted to trading on a national securities
exchange, the average of the closing bid and asked prices on the date of determination as reported in The Wall Street Journal or such other
source as the Board or the Committee deems reliable; or

(b)

(c)

if none of the foregoing is applicable, by the Board or the Committee in good faith.

21.19

“Insider”  means  an  officer  or  director  of  the  Company  or  any  other  person  whose  transactions  in  the  Company’s

Common Stock are subject to Section 16 of the Exchange Act.

21.20

21.21

“IRS” means the United States Internal Revenue Service.

“Option” means an award of an option to purchase Shares pursuant to Section 5.

11

 
21.22

“Outside Director” means a Director who is not an Employee of the Company or any Parent or Subsidiary and who

is an “independent” director under the rules of The Nasdaq Stock Market, as may be amended from time to time.

21.23

“Parent”  means  any  corporation  (other  than  the  Company)  in  an  unbroken  chain  of  corporations  ending  with  the
Company  if  each  of  such  corporations  other  than  the  Company  owns  stock  possessing  fifty  percent  (50%)  or  more  of  the  total  combined
voting power of all classes of stock in one of the other corporations in such chain.

21.24

“Performance  Factors”  means  the  factors  selected  by  the  Committee  to  determine  whether  performance  goals

established by the Committee applicable to Awards have been satisfied.

21.25

“Performance Period” means the period of service determined by the Committee during which years of service or

performance is to be measured for the Award.

21.26

“Permitted  Transferee”  means  any  child,  stepchild,  grandchild,  parent,  stepparent,  grandparent,  spouse,  former
spouse, sibling, niece, nephew, mother-in-law, father-in-law, son-in-law, daughter-in-law, brother-in-law, or sister-in-law (including adoptive
relationships)  of  the  Employee,  any  person  sharing  the  Employee’s  household  (other  than  a  tenant  or  employee),  a  trust  in  which  these
persons (or the Employee) have more than 50% of the beneficial interest, a foundation in which these persons (or the Employee) control the
management of assets, and any other entity in which these persons (or the Employee) own more than 50% of the voting interests.

21.27

21.28

21.29

21.30

“Plan” means this Sierra Oncology, Inc. 2018 Equity Inducement Plan.

“Restricted Stock Unit” means an Award granted pursuant to Section 6 of the Plan.

“SEC” means the United States Securities and Exchange Commission.

“Securities Act” means the United States Securities Act of 1933, as amended.

21.31

“Service” shall mean service as an Employee to the Company or a Parent, Subsidiary or Affiliate, subject to such
further limitations as may be set forth in the Plan or the applicable Award Agreement. An Employee will not be deemed to have ceased to
provide Service in the case of (a) sick leave, (b) military leave, or (c) any other leave of absence approved by the Company; provided, that
such leave is for a period of not more than 90 days (x) unless reemployment upon the expiration of such leave is guaranteed by contract or
statute, or (y) unless provided otherwise pursuant to formal policy adopted from time to time by the Company and issued and promulgated to
employees in writing. In the case of any Employee on an approved leave of absence or a reduction in hours worked (for illustrative purposes
only,  a  change  in  schedule  from  that  of  full-time  to  part-time),  the  Committee  may  make  such  provisions  regarding  suspension  of  or
modification of vesting of the Award while on leave from the employ of the Company or a Parent, Subsidiary or Affiliate or during such
change in working hours as it may deem appropriate, except that in no event may an Award be exercised after the expiration of the term set
forth in the applicable Award Agreement. In the event of military leave, if required by applicable laws, vesting shall continue for the longest
period  that  vesting  continues  under  any  other  statutory  or  Company  approved  leave  of  absence  and,  upon  a  Employee’s  returning  from
military leave (under conditions that would entitle him or her to protection upon such return under the Uniform Services Employment and
Reemployment Rights Act), he or she shall be given vesting credit with respect to Awards to the same extent as would have applied had the
Employee  continued  to  provide  services  to  the  Company  throughout  the  leave  on  the  same  terms  as  he  or  she  was  providing  services
immediately prior to such leave. Except as set forth in this Section 28.39, an employee shall have terminated employment as of the date he or
she ceases provide services (regardless

12

 
of whether the termination is in breach of local employment laws or is later found to be invalid) and employment shall not be extended by
any  notice  period  or  garden  leave  mandated  by  local  law,  provided however,  that  a  change  in  status  from  an  employee  to  a  consultant  or
advisor shall not terminate the service provider’s Service, unless determined by the Committee, in its discretion. The Committee will have
sole discretion to determine whether a  Employee  has  ceased  to  provide  Services  and  the  effective  date  on  which  the  Employee  ceased  to
provide Services.

21.32

“Shares” means shares of Common Stock and the common stock of any successor entity.

21.33

“Subsidiary” means any corporation (other than the Company) in an unbroken chain of corporations beginning with
the Company if each of the corporations other than the last corporation in the unbroken chain owns stock possessing fifty percent (50%) or
more of the total combined voting power of all classes of stock in one of the other corporations in such chain.

21.34

21.35

“Treasury Regulations” means regulations promulgated by the United States Treasury Department.

“Unvested Shares”  means  Shares  that  have  not  yet  vested  or  are  subject  to  a  right  of  repurchase  in  favor  of  the

Company (or any successor thereto).

13

 
 
SIERRA ONCOLOGY, INC.

(the “Company”)

2018 EQUITY INDUCEMENT PLAN

(the “Plan”)

A.

B.

ADDENDUM FOR CANADIAN PARTICIPANTS

The Company has adopted the Plan, to be effective on the Effective Date.

The  Company  desires  to  modify  certain  terms  of  the  Plan  in  their  application  for  Employees  (as  those  terms  are  defined  in  the
Plan) who are resident in Canada for purposes of the Income Tax Act (Canada) or otherwise subject to Canadian personal income
tax (the “Canadian Employees”).

NOW THEREFORE, the Company does hereby amend certain terms and conditions of the Plan as they apply to the Canadian

Employees, as follows.

1.

2.

3.

4.

Defined Terms. In this Addendum, all defined terms shall have the respective meanings set forth in the Plan, unless otherwise
defined herein.

Effective Date. The effective date of this Addendum is the Effective Date.

Addendum. The  Company  hereby  amends  certain  terms  and  conditions  of  the  Plan  pursuant  to  which  the  Company  may  grant
Options to any Canadian Eligible Person, if the participation by the Canadian Eligible Person in such distribution of securities is
voluntary (as such term is interpreted pursuant to Section 2.23(2) of NI 45-106) and is otherwise permitted under NI 45-106.

Options.

(a)

(b)

(c)

Notwithstanding section 5.2 of the Plan, the grant date of an Option awarded to a Canadian Employee shall be, in all
cases, the date the Option is actually granted to the Canadian Employee, as evidenced by the Award Agreement.

Notwithstanding  section  5.1  of  the  Plan,  satisfaction  of  Performance  Factors,  if  any,  will  be  treated  as  a  condition
subsequent to the grant to a Canadian Employee of an Option giving rise to a risk of forfeiture of the Option and not a
condition precedent to the grant of the Option.

For purposes of section 5.9 of the Plan, Options granted to a Canadian Employee will not be modified or altered, or new
options granted in substitution therefor, if such modification, alteration or substitution has a material adverse affect on
such Canadian Employee’s tax treatment of such Options, except with such Canadian Employee’s consent.

5.

Restricted Stock Units.

Section 6.2 of the Plan shall be modified as it applies to Canadian Employees such that the Company agrees to issue only Shares
in payment of RSUs to a Canadian Employee and the Company cannot choose, at its option, to make such payment in cash or a
combination of cash and Shares, and section 6.2 shall read as follows:

 
 
 
 
 
 
“6.2. Form and Timing of Settlement to Canadian Employees. Payment of earned RSUs of a Canadian Employee shall be made as
soon as practicable after the date(s) determined by the Committee and set forth in the Award Agreement. Such earned RSUs shall
be settled solely by the issuance of Shares. The Committee may permit a Canadian Employee to defer settlement and the issuance
of Shares in payment of an earned RSU to a date that is acceptable to the Committee, provided that, in the case of a Canadian
Eligible Person that is an Employee, the terms of the Award Agreement, the RSUs and any deferral meet the conditions of section
7 of the Income Tax Act (Canada).”

6.

Payment for Share Purchases.

Section 7(b) of the Plan shall be modified as at applies to Canadian Employees with respect to the consideration that may be paid
by Canadian Employees for Shares purchased pursuant to the Plan. In no circumstances shall a Canadian Employee be permitted
to make, and the Committee shall not approve, a payment by the Canadian Employee by the surrender of any Shares that were
acquired at any time by the Canadian Employee on the exercise of any Option.

7.

Withholding Taxes.

(a)

Section 8.1 of the Plan shall be modified as it applies to Canadian Employees and shall read as follows:

“8.1 Withholding for Canadian Employees. The Company or any Affiliate shall deduct and withhold any taxes and other required
source  deductions  which  the  Company  or  Affiliate,  as  the  case  may  be,  is  required  by  law  or  regulation  of  any  governmental
authority  whatsoever  to  deduct,  withhold  or  remit  in  connection  with  the  grant,  exercise  or  settlement  of  any  Award.  Without
limiting  the  generality  of  the  foregoing,  whenever  a  settlement  or  payment  is  made  by  the  issuance  of  Shares  to  a  Canadian
Employee in satisfaction of Awards granted under this Plan, the Company or Affiliate, as the case may be, may, at its discretion (i)
deduct and withhold those amounts it is required to remit from any cash remuneration or other amount payable to the Canadian
Employee, whether or not such amount payable is related to the Plan, or the exercise or settlement of any Awards; (ii) permit the
Canadian Employee to make a cash payment to the Company or Affiliate, as the case may be, equal to the amount required to be
remitted; or (iii) sell, on behalf of the Canadian Employee, that number of Shares to be issued on the exercise or settlement such
that  the  amount  of  the  proceeds  of  such  sale  will  be  sufficient  to  satisfy  any  taxes  or  other  source  deductions  required  to  be
remitted for the account of the Canadian Employee. If the Company or Affiliate, as the case may be, considers that the foregoing
steps undertaken in connection with this section 13.1 result in inadequate withholding or a late remittance of taxes or other source
deductions, then the delivery of Shares to be issued on the exercise or settlement of Awards may be made conditional upon the
Canadian Employee (or other person) reimbursing or compensating the Company or Affiliate or making arrangements satisfactory
to the Company or Affiliate for the payment in a timely manner of all taxes and other source deductions required to be remitted.”

(b)

Section 8.2 of the Plan shall not apply to Canadian Employees. For greater certainty, the Committee shall not approve
funding  by  a  Canadian  Employee  of  withholding  taxes  or  other  source  deductions  by  the  withholding  of  Shares  the
Canadian Employee is otherwise entitled to receive or the surrender by the Canadian Employee of any Shares that were
acquired at any time by the Canadian Employee on the exercise of any Option.

 
 
 
 
NOTICE OF STOCK OPTION GRANT

SIERRA ONCOLOGY, INC. 2018 EQUITY INDUCEMENT PLAN

Unless otherwise defined herein, the terms defined in the Sierra Oncology, Inc. (the “Company”) 2018 Equity Inducement Plan (the “Plan”)
shall have the same meanings in this Notice of Stock Option Grant (the “Notice of Grant”) and the attached Stock Option Agreement (the
“Option Agreement”). You have been granted an Option to purchase shares of Common Stock of the Company under the Plan subject to the
terms and conditions of the Plan, this Notice of Grant and the attached Option Agreement.

Name:

Address:

Date of Grant:

Vesting Commencement Date:

Exercise Price per Share:

Total Number of Shares:

Type of Option:

Expiration Date:

Vesting Schedule:

Additional Terms:

Non-Qualified Stock Option

______________, 20__; This Option expires earlier if your Service terminates earlier, as
described in the Stock Option Agreement.

If this box is checked, the additional terms and conditions set forth on Attachment 1 hereto (as
executed by the Company) are applicable and are incorporated herein by reference. No document
need be attached as Attachment 1 if the box is not checked.

You understand that your employment relationship with the Company is for an unspecified duration, can be terminated at any time (i.e., is
“at-will”), and that nothing in this Notice, the Option Agreement or the Plan changes the at-will nature of that relationship. By accepting this
Option, you and the Company agree that this Option is granted under and governed by the terms and conditions of the Plan, the Notice of
Grant and the Option Agreement. By accepting this Option, you consent to electronic delivery as set forth in the Option Agreement.

PARTICIPANT:

Signature

Print Name:

SIERRA ONCOLOGY, INC.

By:

Name:

Its:

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
STOCK OPTION AGREEMENT

SIERRA ONCOLOGY, INC.

2018 EQUITY INDUCEMENT PLAN

You have been granted an Option by Sierra Oncology, Inc. (the “Company”) under the 2018 Equity Inducement Plan (the “Plan”)
to purchase Shares (the “Option”), subject to the terms, restrictions and conditions of the Plan, the Notice of Stock Option Grant (the “Notice
of Grant”) and this Stock Option Agreement (the “Agreement”).

Grant of Option.  You have been granted an Option for the number of Shares set forth in the Notice of Grant at the exercise price
per Share set forth in the Notice of Grant (the “Exercise Price”).  In the event of a conflict between the terms and conditions of the Plan and
the terms and conditions of this Agreement, the terms and conditions of the Plan shall prevail.  The Option is designated as a Nonqualified
Stock Option (“NSO”).

Termination Period.

General Rule.  If your Service terminates for any reason except death or Disability, and other than for Cause, then this
Option will expire at the close of business at Company headquarters on the date three (3) months after your termination of Service (subject to
the expiration detailed in Section 6).  If your Service is terminated for Cause, this Option will expire upon the date of such termination.  The
Company  determines  when  your  Service  terminates  for  all  purposes  under  this  Agreement.   You  acknowledge  and  agree  that  the  Vesting
Schedule  may  change  prospectively  in  the  event  that  your  service  status  changes  between  full  and  part-time  status  in  accordance  with
Company policies relating to work schedules and vesting of awards.  You acknowledge that the vesting of the Shares pursuant to this Notice
is earned only by continuing Service and that any unvested portion of your Option will expire on the termination of your employment for any
reason.

Death; Disability.  If you die before your Service terminates (or you die within three (3) months of your termination of
Service other than for Cause), then this Option will expire at the close of business at Company headquarters on the date twelve (12) months
after the date of your death (subject to the expiration detailed in Section 6).  If your Service terminates because of your Disability, then this
Option will expire at the close of business at Company headquarters on the date twelve (12) months after your termination date (subject to
the expiration detailed in Section 6).

Black-Out Period.  Notwithstanding the foregoing, if any post-termination exercise period set forth above terminates on
a date that falls within a Blackout Period (as defined below) or within ten (10) business days following the expiration of a Blackout Period,
such expiration date shall be automatically extended without any further act or formality to that date which is ten (10) business days after the
end of such Blackout Period, with such tenth (10th) business day to be considered the expiration date of such Option for all purposes under
the  Plan,  subject  to  earlier  expiration  detailed  in  Section  6.  For  purposes  of  this  Agreement,  “Blackout Period”  means  the  period  during
which  designated  directors,  officers  and  employees  of  the  Company  cannot  trade  Shares  pursuant  to  the  Company’s  policy  respecting
restrictions on director’, officers’ and employee trading which is in effect at the time.

No Notice.  You are responsible for keeping track of these exercise periods following your termination of Service for
any reason.  The Company will not provide further notice of such periods.  In no event shall this Option be exercised later than the Expiration
Date set forth in the Notice of Grant.

 
 
Exercise of Option.

Right to Exercise.  This Option is exercisable during its term in accordance with the Vesting Schedule set forth in the
Notice of Grant and the applicable provisions of the Plan and this Agreement.  In the event of your death, Disability, or other cessation of
Service, the exercisability of the Option is governed by the applicable provisions of the Plan, the Notice of Grant and this Agreement.  This
Option may not be exercised for a fraction of a Share.

Method of Exercise.  This Option is exercisable by delivery of an exercise notice in a form specified by the Company
(the “Exercise Notice”), which shall state the election to exercise the Option, the number of Shares in respect of which the Option is being
exercised  (the  “Exercised  Shares”),  and  such  other  representations  and  agreements  as  may  be  required  by  the  Company  pursuant  to  the
provisions of the Plan.  The Exercise Notice shall be delivered in person, by mail, via electronic mail or facsimile or by other authorized
method to the Secretary of the Company or other person designated by the Company.  The Exercise Notice shall be accompanied by payment
of the aggregate Exercise Price as to all Exercised Shares.  This Option shall be deemed to be exercised upon receipt by the Company of a
fully executed Exercise Notice accompanied by the aggregate Exercise Price and any applicable tax withholding due upon exercise of the
Option.

Exercise  by  Another.    If  another  person  wants  to  exercise  this  Option  after  it  has  been  transferred  to  him  or  her  in
compliance with this Agreement and the Plan, that person must prove to the Company’s satisfaction that he or she is entitled to exercise this
Option.    That  person  must  also  complete  the  proper  Exercise  Notice  form  (as  described  above)  and  pay  the  Exercise  Price  (as  described
below) and any applicable tax withholding due upon exercise of the Option (as described below).

Method of Payment.  Payment of the aggregate Exercise Price shall be by personal check, wire transfer, cashier’s check, or, with

the Company’s consent; any of the following, or a combination thereof:

certificates  for  shares  of  Company  stock  that  you  own,  along  with  any  forms  needed  to  effect  a  transfer  of  those  shares  to  the
Company;  the  Fair  Market  Value  of  the  shares,  determined  as  of  the  effective  date  of  the  Option  exercise,  will  be  applied  to  the  Option
Exercise Price.  Instead of surrendering shares of Company stock, you may attest to the ownership of those shares on a form provided by the
Company and have the same number of shares subtracted from the Option shares issued to you.  However, you may not surrender, or attest to
the  ownership  of,  shares  of  Company  stock  in  payment  of  the  Exercise  Price  of  your  Option  if  your  action  would  cause  the  Company  to
recognize compensation expense (or additional compensation expense) with respect to this Option for financial reporting purposes;

cashless exercise through irrevocable directions to a securities broker approved by the Company to sell all or part of the Shares
covered by this Option and to deliver to the Company from the sale proceeds an amount sufficient to pay the Option Exercise Price and any
withholding  taxes.   The  balance  of  the  sale  proceeds,  if  any,  will  be  delivered  to  you.   The  directions  must  be  given  by  signing  a  special
notice of exercise form provided by the Company; or

other method authorized by the Company.

Non-Transferability  of  Option.    In  general,  except  as  provided  below,  only  you  may  exercise  this  Option  prior  to  your
death.  You may not transfer or assign this Option, except as provided below.  For instance, you may not sell this Option or use it as security
for a loan.  If you attempt to do any of these things, this Option will immediately become invalid.  You may, however, dispose of this Option
in your will or in a beneficiary designation.  However, the Committee (as defined in the Plan) may, in its sole discretion, allow you to transfer
this Option as a gift to one or more family members.  For purposes of this

 
 
Agreement,  “family  member”  means  a  child,  stepchild,  grandchild,  parent,  stepparent,  grandparent,  spouse,  former  spouse,  sibling,  niece,
nephew,  mother-in-  law,  father-in-law,  son-in-law,  daughter-in-law,  brother-in-law  or  sister-in-law  (including  adoptive  relationships),  any
individual sharing your household (other than a tenant or employee), a trust in which one or more of these individuals have more than 50% of
the beneficial interest, a foundation in which you or one or more of these persons control the management of assets, and any entity in which
you or one or more of these persons own more than 50% of the voting interest. In addition, the Committee may, in its sole discretion, allow
you  to  transfer  this  Option  to  your  spouse  or  former  spouse  pursuant  to  a  domestic  relations  order  in  settlement  of  marital  property
rights.    The  Committee  will  allow  you  to  transfer  this  Option  only  if  both  you  and  the  transferee(s)  execute  the  forms  prescribed  by  the
Committee, which include the consent of the transferee(s) to be bound by this Agreement.  This Option may not be transferred in any manner
other than by will or by the laws of descent or distribution or court order and may be exercised during the lifetime of you only by you, your
guardian, or legal representative, as permitted in the Plan.  The terms of the Plan and this Agreement shall be binding upon the executors,
administrators, heirs, successors and assigns of you.

Term of Option.  This Option shall in any event expire on the expiration date set forth in the Notice of Grant, which date is ten

(10) years after the grant date.

Tax Consequences.  You should consult a tax adviser for tax consequences relating to this Option in the jurisdiction in which you
are  subject  to  tax.    YOU  SHOULD  CONSULT  A  TAX  ADVISER  BEFORE  EXERCISING  THIS  OPTION  OR  DISPOSING  OF  THE
SHARES.  You will not be allowed to exercise this Option unless you make arrangements acceptable to the Company to pay any withholding
taxes that may be due as a result of the Option exercise.

Withholding Taxes and Stock Withholding.  Regardless of any action the Company or your actual employer (the “Employer”)
takes with respect to any or all income tax, social insurance, payroll tax, payment on account or other tax-related withholding (“Tax-Related
Items”), you acknowledge that the ultimate liability for all Tax-Related Items legally due by you is and remains your responsibility and that
the  Company  and/or  the  Employer  (1)  make  no  representations  or  undertakings  regarding  the  treatment  of  any  Tax-Related  Items  in
connection with any aspect of the Option grant, including the grant, vesting or exercise of the Option, the subsequent sale of Shares acquired
pursuant to such exercise and the receipt of any dividends; and (2) do not commit to structure the terms of the grant or any aspect of the
Option to reduce or eliminate your liability for Tax-Related Items. You acknowledge that if you are subject to Tax-Related Items in more than
one  jurisdiction,  the  Company  and/or  the  Employer  may  be  required  to  withhold  or  account  for  Tax-Related  Items  in  more  than  one
jurisdiction.

Prior to exercise of the Option, you shall pay or make adequate arrangements satisfactory to the Company and/or the Employer to satisfy all
withholding and payment on account obligations of the Company and/or the Employer.  In this regard, you authorize the Company and/or the
Employer to withhold all applicable Tax-Related Items legally payable by you from your wages or other cash compensation paid to you by
the Company and/or the Employer.  With the Company’s consent, these arrangements may also include, if permissible under local law, (a)
withholding  Shares  that  otherwise  would  be  issued  to  you  when  you  exercise  this  Option,  by  considering  applicable  statutory  or  other
withholding rates, including up to maximum rates, (b) having the Company withhold taxes from the proceeds of the sale of the Shares, either
through a voluntary sale or through a mandatory sale arranged by the Company (on your behalf and you hereby authorize such sales by this
authorization), (c) your payment of a cash amount, or (d) any other arrangement approved by the Company; all under such rules as may be
established  by  the  Committee  and  in  compliance  with  the  any  insider  trading  or  10b-51  trading  policies  of  the  Company,  if  applicable;
provided  however,  that  if  you  are  a  Section  16  officer  of  the  Company  under  the  Exchange  Act,  then  the  Committee  (as  constituted  in
accordance  with  Rule  16b-3  under  the  Exchange  Act)  shall  establish  the  method  of  withholding  from  alternatives  (a)-(d)  above,  and  the
Committee shall establish the method prior

 
 
to  the  Tax-Related  Items  withholding  event.  The  Fair  Market  Value  of  these  Shares,  determined  as  of  the  effective  date  of  the  Option
exercise, will be applied as a credit against the withholding taxes.  You shall pay to the Company or the Employer any amount of Tax-Related
Items that the Company or the Employer may be required to withhold as a result of your participation in the Plan or your purchase of Shares
that cannot be satisfied by the means previously described.  Finally, you acknowledge that the Company has no obligation to deliver Shares
to you until you have satisfied the obligations in connection with the Tax-Related Items as described in this Section.

Acknowledgement.    The  Company  and  you  agree  that  the  Option  is  granted  under  and  governed  by  the  Notice  of  Grant,  this
Agreement and the provisions of the Plan (incorporated herein by reference).  You: (i) acknowledge receipt of a copy of the Plan prospectus,
(ii) represent that you have carefully read and are familiar with their provisions, and (iii) hereby accept the Option subject to all of the terms
and conditions set forth herein and those set forth in the Plan and the Notice of Grant.  You hereby agree to accept as binding, conclusive and
final all decisions or interpretations of the Committee upon any questions relating to the Plan, the Notice of Grant and the Agreement.

Consent to Electronic Delivery of All Plan Documents and Disclosures.  By your acceptance of this Option, you consent to the
electronic delivery of the Notice of Grant, this Agreement, account statements, Plan prospectuses required by the Securities and Exchange
Commission, U.S. financial reports of the Company, and all other documents that the Company is required to deliver to its security holders
(including, without limitation, annual reports and proxy statements) or other communications or information related to the Option.  Electronic
delivery may include the delivery of a link to a Company intranet or the internet site of a third party involved in administering the Plan, the
delivery of the document via e-mail or such other delivery determined at the Company’s discretion.  You acknowledge that you may receive
from the Company a paper copy of any documents delivered electronically at no cost if you contact the Company by telephone, through a
postal service or electronic mail at _____________.  You further acknowledge that you will be provided with a paper copy of any documents
delivered  electronically  if  electronic  delivery  fails;  similarly,  you  understand  that  you  must  provide  on  request  to  the  Company  or  any
designated  third  party  a  paper  copy  of  any  documents  delivered  electronically  if  electronic  delivery  fails.   Also,  you  understand  that  your
consent  may  be  revoked  or  changed,  including  any  change  in  the  electronic  mail  address  to  which  documents  are  delivered  (if  you  have
provided an electronic mail address), at any time by notifying the Company of such revised or revoked consent by telephone, postal service
or electronic mail at ______________.  Finally, you understand that you are not required to consent to electronic delivery.

Compliance with Laws and Regulations.  The exercise of this Option will be subject to and conditioned upon compliance by the
Company  and  you  with  all  applicable  state,  federal  and  foreign  laws  and  regulations  and  with  all  applicable  requirements  of  any  stock
exchange or automated quotation system on which the Company’s Common Stock may be listed or quoted at the time of such issuance or
transfer.  The Shares issued pursuant to this Agreement shall be endorsed with appropriate legends, if any, determined by the Company.

Governing Law; Severability.  If one or more provisions of this Agreement are held to be unenforceable under applicable law,
the parties agree to renegotiate such provision in good faith.  In the event that the parties cannot reach a mutually agreeable and enforceable
replacement for such provision, then (i) such provision shall be excluded from this Agreement, (ii) the balance of this Agreement shall be
interpreted  as  if  such  provision  were  so  excluded  and  (iii)  the  balance  of  this  Agreement  shall  be  enforceable  in  accordance  with  its
terms.  This Agreement and all acts and transactions pursuant hereto and the rights and obligations of the parties hereto shall be governed,
construed and interpreted in accordance with the laws of the State of Delaware, without giving effect to principles of conflicts of law.  For
purposes of

 
 
litigating any dispute that may arise directly or indirectly from the Plan, the Notice and this Agreement, the parties hereby submit and consent
to litigation in the exclusive jurisdiction of the State of Delaware.

No Rights as Employee.  Nothing in this Agreement shall affect in any manner whatsoever the right or power of the Company, or

a Parent, Subsidiary or Affiliate of the Company, to terminate your Service, for any reason, with or without Cause.

Adjustment.  In the event of a stock split, a stock dividend or a similar change in Company stock, the number of Shares covered

by this Option and the Exercise Price per Share may be adjusted pursuant to the Plan.

Award Subject to Company Clawback or Recoupment.  To the extent permitted by applicable law, the Option shall be subject
to clawback or recoupment pursuant to any compensation clawback or recoupment policy adopted by the Board or required by law during the
term of your employment or other Service that is applicable to you.  In addition to any other remedies available under such policy, applicable
law may require the cancellation of your Option (whether vested or unvested) and the recoupment of any gains realized with respect to your
Option.

Entire  Agreement;  Enforcement  of  Rights.    This  Agreement,  the  Plan  and  the  Notice  constitute  the  entire  agreement  and
understanding of the parties relating to the subject matter herein and supersede all prior discussions between them.  Any prior agreements,
commitments or negotiations concerning this Option are superseded.  No modification of or amendment to this Agreement, nor any waiver of
any rights under this Agreement, shall be effective unless in writing and signed by the parties to this Agreement.  The failure by either party
to enforce any rights under this Agreement shall not be construed as a waiver of any rights of such party.

BY ACCEPTING THIS OPTION, YOU AGREE TO ALL OF THE TERMS AND CONDITIONS DESCRIBED ABOVE AND

IN THE PLAN.

 
 
EXHIBIT 10.12

CERTAIN  IDENTIFIED  INFORMATION  HAS  BEEN  OMITTED  FROM  THIS  EXHIBIT  BECAUSE  IT  IS  NOT  MATERIAL
AND  WOULD  LIKELY  CAUSE  COMPETITIVE  HARM  TO  THE  REGISTRANT  IF  PUBLICLY  DISCLOSED.  [*****]
INDICATES THAT INFORMATION HAS BEEN OMITTED.

Amendment No.1 to the License Agreement

This Amendment of the License Agreement (“Amendment No. 1”) is made and entered on the last signature date below by and between
CRT Pioneer Fund LP, a limited liability partnership established in England and Wales under number LP 14391 with registered office at 4
Claridge Court, Lower Kings Road, Berkhamsted, Hertfordshire, HP4 2AF (“CPF”), acting by its general partner, CRT Pioneer GP Limited,
a company registered in England and Wales with registered number 07933818 whose registered office is at 4 Claridge Court, Lower Kings
Road,  Berkhamsted,  Hertfordshire,  HP4  2AF  (the  “General  Partner”)  and  Sierra  Oncology,  Inc.,  a  Delaware  corporation  with  its  head
office located at 46701 Commerce Center Drive, Plymouth, MI 48170 (“Sierra”).

WHEREAS:

(A)

(B)
(C)

CPF and Sierra (formerly ProNAi Therapeutics, Inc) entered into an agreement for the development and commercialization of the
CHK1  Programme  in  the  Territory  (each  as  defined  in  the  License  Agreement)  on  27  September  2016  (the  “License
Agreement”).
CPF and Sierra agree to amend the License Agreement in accordance with the provisions of this Amendment Agreement.
Therefore, pursuant to clause 19 of the License Agreement, and in consideration of the covenants and obligations contained herein
and other valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties agree to amend the
terms of the License Agreement as set out in this Amendment Agreement.

NOW IT IS HEREBY AGREED as follows:

1.
2.
3.

4.

Capitalized terms not otherwise defined herein shall have the same meaning as set forth in the License Agreement.
All references in the Agreement to “ProNAi” shall be deleted and replaced with references to “Sierra”.
Schedule  6  of  the  License  Agreement  shall  be  deleted  in  its  entirety  and  shall  be  replaced  with  the  new  Schedule  6  set  out  in
Annex A to this Amendment Agreement.
Except as expressly set forth herein, all of the terms and conditions of the License Agreement shall remain unchanged, unmodified
and in full force and effect.

(Signature page follows]

[*****]  Certain  identified  information  denoted  with  an  asterisk  have  been  omitted  from  this  exhibit  because  it  is  not  material  and  would
likely cause competitive harm to the Registrant if publicly disclosed.

1

 
 
 
IN WITNESS WHEREOF, the Parties hereto have caused this Amendment to be executed by their duly authorised representatives.

CRT PIONEER FUND LP acting by CRT Pioneer GP Limited its General Partner

Signature:  

/s/ Ian Miscampbell

Name:

Ian Miscampbell

Date:

  11/9/2020

Sierra Oncology, Inc.

Signature:  

/s/ Christina Thomson

Name:

  Christina Thomson

Date:

  11/9/2020

Signature:  

/s/ Stephen Dilly

Name:

  Stephen Dilly

Date:

  11/10/2020

[*****]  Certain  identified  information  denoted  with  an  asterisk  have  been  omitted  from  this  exhibit  because  it  is  not  material  and  would
likely cause competitive harm to the Registrant if publicly disclosed.

2

 
 
 
 
 
 
Annex A

SCHEDULE 6

PAYMENT

Payment (USD)

$7,000,000

$2,000,000

Equal to:

[*****]

[*****]

Signature Fee

Transfer of CTAs

Royalties

[*****]

In the event that a Milestone Payment becomes due for a Milestone Event under this Schedule 6, but one or more Milestone Payments tied to
earlier stages in development of such Licensed Product were not paid, then such Milestone Payment attached to the earlier Milestone Event
shall become due and payable contemporaneously with the payment for such later Milestone Event.

In  the  event  that  Sierra  is  [*****]  then  all  [*****]  milestones  set  out  above  for  the  relevant  regulatory  authority  shall  become  due  and
payable.

[*****]  Certain  identified  information  denoted  with  an  asterisk  have  been  omitted  from  this  exhibit  because  it  is  not  material  and  would
likely cause competitive harm to the Registrant if publicly disclosed.

3

 
 
 
 
 
EXHIBIT 10.14

SUBLANDLORD:

SIERRA ONCOLOGY CANADA ULC

SUBTENANT:

SCOUGALL MANAGEMENT (1987) LIMITED

BUILDING:

Suite 2150
885 WEST GEORGIA STREET VANCOUVER, BC

S U B L E A S E

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
S U B L E A S E

This Sublease (the “Sublease”) date as of the  1st day of December 2020

BETWEEN

SIERRA ONCOLOGY CANADA ULC (The “Sublandlord”); and

SCOUGALL MANAGEMENT (1987) LIMITED (The “Subtenant”)

Sublandlord subleases to Subtenant a portion of the building known municipally as 885 West Georgia Street, Vancouver BC (the “Building”)
on the terms and conditions below. Any capitalized terms that are not expressly defined shall have the meanings ascribed to them under the
Head Lease.

 1.

PREMISES

The  subleased  premises  shall  consist  of  eight  thousand  three  hundred  and  forty  seven  (8,347)  square  feet  of  rentable  area,  being  a
portion of the 21st floor of the Building designated as Suite 2150, all as outlined in red on the floor plan attached as Schedule “A” (the
“Premises”).

 2.

TERM

The term of the Sublease (the “Term”) shall be for approximately two (2) years and one (1) month commencing on the Commencement
Date (as hereinafter defined) and expiring on February 27, 2023 (the “Termination Date”).

 3.

PRIOR ENTRY

For the purposes hereof, the term “Possession Date” shall mean the date on which all of the following have occurred (I) the parties
shall  have  received  a  duly  executed  copy  of  the  Head  Landlord’s  Consent  (as  hereinafter  defined),  (II)  intentionally  deleted,  (III)
Sublandlord shall have completed Sublandlord’s Work (as hereinafter defined) in accordance with the provisions hereof and notified
Subtenant  of  the  same,  and  (IV)  Sublandlord  shall  have  delivered  the  Premises  to  Subtenant  in  the  condition  required  in  Section  8
below;  it  being  agreed  that  the  Possession  Date  shall  not  occur  earlier  than  December  1,  2020.  For  the  purposes  hereof,  the  term
“Fixturing  Period”  shall  mean  the  period  commencing  on  the  Possession  Date  and  expiring  on  the  3-month  anniversary  of  the
Possession Date (the date immediately following such expiration of the Fixturing Period, the “Commencement Date”).  Sublandlord
shall  use  commercially  reasonable  efforts  to  cause  the  Possession  Date  to  occur  on  December  1,  2020.  The  Subtenant  and  the
Subtenant’s contractor shall have complete, vacant and exclusive access to, and use of, the Premises at all times during the Fixturing
Period for the purpose of constructing the Subtenant’s Leasehold Improvements and installation of the Subtenant’s furniture, fixtures
and equipment. There shall be no Base Rent (as hereinafter defined) and/or Additional Rent (as hereinafter defined) due and payable
during the Fixturing Period. In the event the Subtenant completes its Leasehold Improvements and any other initial work required by
Subtenant in all or part of the Premises prior to the Commencement Date, then the Subtenant shall be permitted from and after such date
to occupy and carry on business from such portion or whole of the Premises provided that during both the Fixturing Period and during
such period after completion of Subtenant’s Leasehold Improvements but before the Commencement Date, all terms of the Sublease
shall be in

1

 
 
 
 
 
 
 
full  force  and  effect,  save  only  that  there  shall  be  no  Base  Rent  and  Additional  Rent  payable  in  any  event  whatsoever  prior  to  the
Commencement Date.

 4.

BASE RENT

Beginning  on  the  Commencement  Date,  the  Subtenant  shall  pay  to  the  Sublandlord  base  rent  (the  “Base  Rent”)  in  equal  monthly
installments in advance on the first day of each calendar month of the Term at the following rates:

Years 1 to Termination Date: Thirty Dollars ($30.00) per square foot; $250,410.00 per annum; $20,867.50 per month.

In the event the Commencement Date occurs on a day that is not the first day of a calendar month, the Base Rent for the partial month
from the Commencement Date to the first day of the following calendar month shall be prorated.

All Base Rent, Additional Rent, the Deposit (as hereinafter defined), and any other sums due and payable under this Sublease shall be
by  electronic  funds  transfer  using  banking  information  (and  other  information  reasonably  required  for  Subtenant  to  accomplish
payment) provided by Sublandlord to Subtenant as of the date hereof.

 5. ADDITIONAL RENT

Subject to the applicable provisions hereof and of the lease dated June 12, 2017 (the “Head Lease”) between VAN885 West Georgia
LP,  by  its  general  partner,  VAN885  West  Georgia  GP  Ltd.  and  ONTREA  Inc.,  both  by  their  duly  authorized  agent,  The  Cadillac
Fairview Corporation Limited (collectively, the “Head Landlord”), as landlord, and Sublandlord, as tenant, the Subtenant shall pay to
the  Sublandlord,  as  Additional  Rent,  all  Business  Tax  and  its  Proportionate  Share  of  Taxes  and  Operating  Costs  (including  without
limitation  utilities)  for  the  Building,  which  Additional  Rent  is  estimated,  for  the  calendar  year  of  2020,  at  $24.50  per  square  foot  of
Rentable  Area  per  annum  for  the  Premises  (the  “Additional  Rent”).  The  Sublandlord  shall  provide  the  Subtenant  with  the  Head
Landlord’s  estimate  of  the  amount  of  such  Taxes  and  Operating  Costs  and  utilities  at  the  commencement  of  each  calendar  year  as
prescribed and outlined in Section 2.05 of the Head Lease and bill the Subtenant its Proportionate Share of such Taxes and Operating
Costs incurred under the Head Lease in monthly instalments in advance on the first day of each calendar month, which amounts shall be
subject to review and adjustment at year end in accordance the Head Landlord’s Additional Rent adjustments as further outlined in the
Head  Lease.  For  avoidance  of  doubt,  this  Sublease  is  a  completely  net  sublease  to  the  Sublandlord,  except  as  expressly  set  forth
hereunder.  Except  to  the  extent  caused  by  the  acts  or  omissions  of  Sublandlord  or  any  of  its  agents,  contractors  and  employees,  the
Sublandlord shall not be responsible for any expenses or outlays of any nature arising from or relating to the Premises, or the use and
occupancy  thereof,  or  the  contents  thereof  or  the  business  carried  on  therein.  The  Subtenant  shall  pay  all  charges,  impositions  and
outlays of every nature and kind relating to the Premises accruing from and after the Commencement Date, except as expressly set forth
hereunder and except to the extent any such charges, impositions, and outlays are due to the acts or omissions of Sublandlord or any of
its agents, contractors and employees.

 6. OCCUPANCY DELAY

Notwithstanding anything herein to the contrary, should Sublandlord fail to cause the Possession Date to occur by December 15, 2020
through no fault of the Subtenant, then Subtenant shall be provided

2

 
with one (1) day(s) of free Base Rent for every day the Possession Date shall not have occurred beyond December 15, 2020; it being
agreed that such Base Rent credit shall be applied following the Commencement Date such that Subtenant shall receive the benefit of
the same. Notwithstanding anything herein to the contrary, in the event that the Possession Date shall not have occurred on or before
February 1, 2021, then the Subtenant shall have the option, in its sole and absolute discretion, to terminate this Sublease.

 7. USE

The Subtenant may use the Premises for all uses permitted under the Head Lease, including, without limitation, general office use. The
Subtenant  shall  at  all  times  use  the  Premises  and  otherwise  be  in  compliance  with  (i)  all  applicable  Federal,  Provincial,  and  City  of
Vancouver laws and regulations enacted, adopted, and/or amended as of and after the Commencement Date; and (ii) all applicable by-
laws, rules, and regulations applicable to the Building, Lands, and Premises including without limitation Section 1.05 of the Head Lease
and the rules and regulations set forth in Exhibit D to the Head Lease. Notwithstanding anything in the Head Lease and in this Sublease
to the contrary, the Subtenant shall not be required to perform any Alterations to the Building or Building systems to comply with any
applicable  laws  unless  (i)  any  such  Alteration  is  required  by  reason  of  Alterations  having  been  performed  by,  through  or  at  the
Subtenant’s request, or (ii) such Alteration is required by reason of the specific manner of the use of the Premises by the Subtenant (as
opposed to the mere use of the Premises for the uses permitted under this Section 7).

 8. CONDITION OF PREMISES

Subject to the following grammatical paragraph, the Subtenant acknowledges that it has thoroughly inspected the Premises and agrees
that, as of the Possession Date, Subtenant accepts the Premises in its “as is with all faults” but broom-clean and vacant condition and
that Sublandlord has no obligation whatsoever to perform any leasehold or other tenant improvements to prepare the Premises for the
Subtenant’s  occupancy,  other  than  Sublandlord’s  Work  described  in  this  Sublease.  Subtenant  acknowledges  that,  except  as  otherwise
expressly  set  forth  herein,  neither  Sublandlord  nor  any  agent  of  Sublandlord  has  made  any  representation  as  to  the  condition  of  the
Subleased  Premises  or  their  suitability  for  the  conduct  of  Subtenant's  business,  and  Subtenant  waives  any  implied  warranty  that  the
Premises  are  suitable  for  Subtenant’s  intended  purpose.  SUBLANDLORD  AND  SUBTENANT  ACKNOWLEDGE  AND  AGREE
THAT  BY  THEIR  EXECUTION  OF  THIS  SUBLEASE  THE  TERMS  OF  THIS  SECTION  HAVE  BEEN  SPECIFICALLY
NEGOTIATED AND AGREED UPON.

The Sublandlord represents and warrants that, as of the date hereof, to the best of its actual knowledge (without any duty to investigate),
(i) the Base Building services, including HVAC, electrical, plumbing, sprinklers, life safety systems and telecommunication systems are
in good working order and repair and (ii) no asbestos or other Hazardous Substances exist in the Premises. The Sublandlord represents
and warrants that it has not received any notice from a governmental authority or from Head Landlord that the Premises or the Building
are  in  violation  of  any  applicable  laws.  The  phrase  “to  the  best  of  its  actual  knowledge”  as  used  in  this  Sublease  means  the  actual
knowledge only, and not any implied, imputed or constructive knowledge, of the Executive Committee of Sublandlord (who would be
advised of any issues at the Premises related to Building system and safety), without any independent investigation having been made.

Throughout  the  Sublease  Term  and  any  extensions  thereof,  the  Subtenant  shall  be  permitted  to  modify  existing  Leasehold
Improvements and/or install new Leasehold Improvements and perform

3

 
any other Alterations in the Premises, at its sole expense and in a good and workmanlike manner so long as such modifications or new
Leasehold Improvements comply with Article V of the Head Lease, and so long as Subtenant obtains Sublandlord’s (and, as applicable
under the Head Lease, Head Landlord’s) written approval of all plans and specifications with respect thereto; it being agreed, however,
that (I) Sublandlord shall cooperate with Subtenant to obtain any required approvals under the Head Lease from Head Landlord, and (II)
if Sublandlord’s approval is required, Sublandlord’s approval shall not be unreasonably withheld, conditioned or delayed. Other than
Sublandlord’s reasonable out of pocket costs to review plans and specifications of requested Leasehold Improvements or Alterations,
there shall be no charges, administration fees or any other coordination fees charged by the Sublandlord for the supervision of any work
performed  by  or  on  behalf  of  Subtenant  in  the  Premises.  During  construction  of  any  modification  or  new  Leasehold  Improvements,
Subtenant or its general contractor shall procure and maintain in effect all insurance coverages required under the Head Lease.

 9.

SUBLANDLORD’S WORK

The Sublandlord agrees to comply with and diligently perform at its sole cost and expense the following work in a good and workerlike
manner in compliance with all applicable laws, hereinafter collectively described as “Sublandlord’s Work”. The Sublandlord’s Work
shall include:

a.

b.

c.

d.

e.

all existing data cabling to be left in good working order and available for the Subtenants use.

floors to be free of debris, in clean, broom swept condition;

the existing lighting and light fixtures are in good working order;

the existing blinds are in good working order; and

ensure that the Premises is in compliance with all requirements of applicable municipal by-laws, building codes and fire, health
and other regulations and all relevant provincial and federal legislation and regulations.

 10. TENANT’S CONSTRUCTION MANUAL AND AS BUILT CAD DRAWINGS

Within  five  (5)  business  days  of  the  date  of  this  Sublease  set  forth  above,  the  Sublandlord  shall  use  reasonable  efforts  to  locate  any
existing as built CAD drawings for the Premises and shall provide Subtenant with the same.

 11. RESTORATION/MAKE GOOD; SURRENDER; HOLDOVER

Notwithstanding anything to the contrary contained herein or in the Head Lease, upon the expiration or earlier termination of the Term,
Subtenant shall have no obligation to remove Leasehold Improvements and Alterations (including, without limitation, walls, plumbing
and lighting fixtures) that exist in or about the Premises as of the Possession Date (it being agreed that Sublandlord shall, at its sole cost
and  expense,  be  responsible  for  any  required  removal  of  the  same  pursuant  to  the  Head  Lease  unless  otherwise  agreed  to  by  the
parties). Notwithstanding the foregoing, Subtenant shall be obligated to remove any Leasehold Improvements and Alterations from the
Premises that were installed by Subtenant from and after the Possession Date, so long as the same are required to be removed under the
Head  Lease,  unless  Sublandlord,  Subtenant,  and  Head  Landlord  expressly  agree  otherwise  in  writing.  Subject  to  Section  19  hereof,
except as otherwise expressly provided above and except as otherwise expressly agreed to among Sublandlord, Subtenant and Head
Landlord

4

 
 
 
 
 
 
in writing, Subtenant shall, on the last day of the Term of this Sublease, or upon any earlier termination, remove all of the furniture,
furnishings,  Subtenant’s  personal  property,  Trade  Fixtures,  and  equipment  and  surrender  to  Sublandlord  the  Premises  and  all
improvements  to  the  Premises  broom  clean  in  good  order,  condition  and  state  of  repair,  reasonable  wear  and  tear  and  damage  by
casualty excepted. Subtenant acknowledges and agrees that the Term expires on the day before the Head Lease term expires and that
Subtenant has no right to hold over or occupy the Premises past the expiration of the Term. In the event of any unauthorized holding
over, Subtenant shall indemnify and hold Sublandlord harmless from any and all damages arising from or related to such holdover.

 12. SUBLANDLORD DEFAULT; SUBTENANT’S REMEDIES

In the event Sublandlord shall be in default of any of its covenants or obligations under the Sublease following notice thereof and a
reasonable period of time to cure (not to exceed 30 days), unless such default is such that it cannot be cured within 30 days, in which
case,  the  cure  period  shall  be  extended  so  long  as  Sublandlord  commences  cure  within  such  30-day  period  and  pursues  such  cure
diligently to completion. If Sublandlord fails to cure such default within the periods prescribed above, Subtenant shall have the right to
perform  the  same  on  behalf  of  Sublandlord  and  any  costs  and  expenses  incurred  by  Subtenant  in  connection  with  such  performance
shall be reimbursed by Sublandlord to Subtenant within thirty (30) days following receipt of an invoice therefor. If Sublandlord fails to
so  reimburse  Subtenant  within  such  period,  then  Subtenant  shall  have  the  right  to  offset  all  such  unreimbursed  costs  against  the
upcoming instalments of Base Rent and Additional Rent.

 13. SUBTENANT  DEFAULT;  SUBLANDLORD’S  REMEDIES.  Any  of  the  following  occurrences  shall  constitute  a  default  by

Subtenant:

13.1

Failure  to  Pay  Money  When  Due.  If  Subtenant  fails  to  make  any  payment  of  Base  Rent  or  any  other  payment
required to be made by Subtenant hereunder, as and when due, and such default shall continue for a five (5) day period after written
notice from Sublandlord of such failure.

13.2

Other Breaches. If Subtenant fails to observe or perform any other provision of this Sublease (other than failure to
pay Base Rent), including compliance with any applicable rules and regulations, and such default is not rectified within a thirty (30) day
period after written notice from Sublandlord (stating with reasonable particularity the nature of such default), unless such default is of a
nature  that  it  cannot  be  cured  within  such  30  day  period,  in  which  case,  the  cure  period  shall  be  extended  so  long  as  Subtenant
commences cure of such default within such 30 day period and pursues to cure such default diligently to completion. The 30-day grace
period  shall  not  apply  to  Sublandlord’s  right  to  exercise  remedies  under  Section  13.3(a)  with  respect  to  Subtenant’s  breach  of  its
obligations to maintain the required insurance coverages in full compliance with this Sublease.

13.3

Sublandlord’s Remedies. If Subtenant commits a default under this Sublease, continuing beyond applicable notice

and cure periods as provided above, Sublandlord may do any one or more of the following:

a.

Cure the default and charge the costs to Subtenant, in which case Subtenant shall pay such costs as additional rent promptly on
demand, together with interest thereon at the rate of twelve percent (12%) per year or the highest rate permitted by law, whichever
is less.

b.

Terminate this Sublease.

5

 
 
 
c.

Enter and take possession of the Premises and remove Subtenant and all other persons and any property from the Premises, with
process of law.

d. Hold  Subtenant  liable  for  and  collect  rent  and  other  indebtedness  owed  by  Subtenant  to  Sublandlord  or  rent  that  would  have
accrued during the remainder of the Term had there been no default, less any sums Sublandlord receives by reletting the Subleased
Premises.

e.

Hold Subtenant liable for that part of the following sums paid by Sublandlord that are attributable to the remainder of the Term:

(i)

(ii)

(iii)

Customary broker's fees incurred by Sublandlord in reletting part or all of the Premises;

The cost of removing and storing Subtenant's property;

The cost of repairs and alterations reasonably necessary to put the Premises in a condition reasonably acceptable to a

new subtenant; and

(iv)

Other necessary and reasonable expenses incurred by Sublandlord in enforcing its remedies.

14. HEAD LEASE

14.1

Good  Standing  and  Enforcement.  A  copy  of  the  Head  Lease  is  attached  to  this  Sublease  as  Schedule  “B.”
Sublandlord represents and warrants to its actual knowledge that (a) the Head Lease is in good standing and has not been modified, (b)
there are no agreements other than the Head Lease between Head Landlord and Sublandlord concerning the use of the Premises, and (c)
Sublandlord has not received notice of any breach or default of the Head Lease by Sublandlord that has not been cured as of the date of
this Sublease and no event has occurred which with notice or passage of time or both would constitute a default under the Head Lease.
Sublandlord shall keep the Head Lease in full force and effect during the Term hereof and without default or amendment, and to remedy
all breaches of the Head Lease. Sublandlord shall take all commercially reasonable steps to (I) assist Subtenant as Subtenant may from
time-to-time  request,  in  obtaining  services  and  utilities  from  Head  Landlord  pursuant  to  the  Head  Lease,  (II)  enforce  Sublandlord’s
rights  against  Head  Landlord  under  the  Head  Lease  for  the  benefit  of  Subtenant  upon  Subtenant’s  request  therefor  (and  to  promptly
forward to Head Landlord any notices or requests for consent as Subtenant may reasonably request and to make such requests on behalf
of  Subtenant),  and  (III)  enforce  the  performance  of  the  terms,  covenants  and  conditions  of  the  Head  Lease  by  Head  Landlord
throughout  the  Term  (including,  without  limitation,  exercising  all  of  its  rights  and  remedies  available  under  the  Head  Lease).
Sublandlord hereby represents and warrants to Subtenant that it has the right and authority to enter into this Sublease subject to Head
Landlord’s consent.

14.2

Subordination.  Subject  to  the  provisions  of  this  Sublease,  except  as  herein  otherwise  expressly  provided,  this
Sublease is subject and subordinate to the Head Lease, to all ground and underlying leases, to all mortgages and deeds of trust which
may  now  or  hereafter  affect  the  Building,  and  to  any  and  all  renewals,  modifications,  consolidations,  replacements  and  extensions
thereof. Sublandlord agrees not to effect any modification or amendment of the Head Lease without the written consent of Subtenant
(which consent may be given or withheld in Subtenant’s sole and absolute discretion). As of the date hereof, to the best of Sublandlord’s
actual knowledge, Seller represents and warrants that it is not aware of any such ground or underlying leases which affect the Building.

6

 
 
 
 
 
Subtenant agrees, upon request of Sublandlord, at any time or times, to execute and deliver to Sublandlord any and all instruments (in
form and substance reasonably acceptable to Subtenant) as shall be required by Head Landlord to effect a subordination of this Sublease
to the lien of any mortgage, deed of trust, or comparable security instrument in accordance with and subject to the terms of the Head
Lease.

14.3

Adherence to Terms of Head Lease. Subject to the provisions of this Sublease, except as herein otherwise expressly
provided and except as may be inconsistent with the provisions of this Sublease (it being agreed that in the case of such inconsistency,
the last grammatical paragraph of this Section 14.3 shall govern), Subtenant agrees to be bound by all obligations and responsibilities of
Sublandlord  as  tenant  under  the  Head  Lease.  Notwithstanding  anything  herein  to  the  contrary,  the  parties  agree  that  the  following
provisions of the Head Lease are inconsistent with the terms of this Sublease and therefore are not incorporated into this Sublease and
shall  be  inapplicable  to  this  Sublease:  Sections  1.01(e),  (f),  (g),  and  (i),  Section  2.01(b),  Section  2.02,  Section  2.08(c),  Section  2.09,
Section 2.12, Section 3.02(b), Sections 5.05(c) and (d), Section 11.06, Section 11.16, Section 11.17, Section 11.22, Section 11.23, and
Section 11.26. Subtenant shall neither do nor permit anything to be done that would cause the Head Lease to be terminated or forfeited
by  reason  of  any  right  of  termination  or  forfeiture  reserved  or  vested  in  Head  Landlord  under  the  Head  Lease.  Except  to  the  extent
caused by the acts or omissions of Sublandlord, Subtenant shall defend, indemnify and hold Sublandlord harmless from and against any
breach of its obligations under the preceding provisions of this Section, including without limitation attorneys’ fees and costs, including
on appeal.

Sublandlord hereby grants to Subtenant the right to receive all of the services and benefits with respect to the Premises which are to be
provided by Landlord, if any, under the Lease with respect to the Premises during the term of this Sublease.

Sublandlord agrees to pass through to Subtenant all benefits of any rent abatements or rent relief that it shall receive from the Head
Landlord pursuant to the Head Lease, including, without limitation, any rent relief provided pursuant to a government relief program.

The parties hereto agree that, as between Sublandlord and Subtenant, in the event of any conflict between the provisions of the Head
Lease and the provisions of this Sublease, the provisions of this Sublease shall govern and control.

15. RIGHT TO ASSIGN & SUBLEASE

Subtenant shall not sublet all or any portion of the Premises, grant any occupancy rights thereto, or assign this Sublease by operation of
law or otherwise, for any period of time without first obtaining Sublandlord’s and Head Landlord’s written consent which may be given
or  withheld  in  accordance  with  Section  8.01  of  the  Head  Lease.  No  subletting,  assignment  or  other  transfer  under  this  Section  shall
relieve Subtenant of any liability under this Sublease, and no consent to any such transfer shall operate as a waiver of the necessity for
consent  to  a  subsequent  transfer.  Upon  Sublandlord’s  request,  Subtenant  promptly  shall  provide  Sublandlord  with  copies  of  any
instruments of transfer. Request for a sublease, assignment or other transfer shall not relieve Subtenant of the obligation to comply with
the terms of this Section for subsequent proposed transfers.

Notwithstanding anything herein to the contrary, (A) Subtenant may, without the Sublandlord’s consent assign this Sublease or sublet
the Premises in whole or in part to any holding body corporate, subsidiary body corporate, affiliated company or partnership, or any
other partnership, and to any company or partnership with which the Subtenant has merged, amalgamated, consolidated or has

7

 
split,  as  defined  in  the  Canada  Business  Corporations  Act  as  of  the  Commencement  Date,  provided  that  the  Subtenant  notifies  the
Sublandlord  in  writing  and  remains  jointly  and  severally  responsible  for  the  fulfilment  of  this  Sublease  obligations,  (B)  a  change  of
control of Subtenant (or its affiliate) shall not be deemed to be a transfer of this Sublease and shall not require Sublandlord’s consent,
and  (C)  Subtenant  shall  have  right  to  assign  this  Sublease  or  to  sublet  all  or  part  of  the  Premises  to  a  Related  Entity  (as  hereinafter
defined)  without  Sublandlord’s  prior  consent  but  upon  written  notice  to  the  Sublandlord.  A  “Related  Entity”  means  a  corporation,
partnership or other entity that: (i) holds controlling interest in the Subtenant, (ii) is controlled by the same entity that has controlling
interest in the Subtenant, (iii) is wholly owned by the Subtenant; and/or (iii) is a successor entity of the Subtenant.

Notwithstanding  anything  herein  to  the  contrary,  subject  to  Head  Landlord’s  Consent,  (I)  Sublandlord  and  Subtenant  agree  that  the
Premises may be occupied and used by the Subtenant and the law firm of Cassels Brock & Blackwell LLP and any other Related Entity
along  with  any  such  entity’s  partners,  employees,  counsel,  consultants  and  contractors  (“Permitted  Occupants”)  without  such
occupation and use constituting an assignment of this Sublease or a sub-sublease of the Premises and (II) any withdrawal, admission,
retirement,  death,  incompetency  or  bankruptcy  of  any  partner(s)  or  member(s)  of  Subtenant  or  its  affiliates  (including,  without
limitation,  Cassels  Brock  &  Blackwell  LLP)  or  the  reallocation  of  equity,  ownership,  voting  or  other  interests  in  Subtenant  (or  its
affiliates)  among  partners  or  members  shall  not  be  deemed  a  transfer  hereunder  and  shall  not  require  Sublandlord’s  consent.
Notwithstanding anything to the contrary in this Section including the occupation and use of the Premises by Permitted Occupants as
described in this Section (e.g., any payment or other arrangements Subtenant may have with Permitted Occupants to use or occupy the
Premises), Subtenant shall at all times remain fully and solely responsible as Subtenant to comply with the terms of this Sublease and
Subtenant’s  indemnity  obligations  under  Section  16  below  shall  apply  to  the  acts,  omissions,  and  willful  misconduct  of  any  and  all
Permitted Occupants.

16.

INDEMNIFICATION

Subject  to  Section  21  below,  Subtenant  will  defend,  indemnify  and  hold  harmless  Sublandlord  and  Head  Landlord  from  any  claim,
liability or suit, including attorney fees, on behalf of any party for any injury or damage occurring in or about the (a) Premises from any
cause whatsoever, except to the extent caused by the negligence or intentional misconduct of Sublandlord or Head Landlord (or any of
their respective agents, contractors or employees) and (b) Building, if and to the extent such damage or injury was caused by any act,
omission (where there is a duty to act), negligence or intentional act of Subtenant, Subtenant's agents, employees, servants, customers,
clients, contractors, or invitees, or Permitted Occupants.

Subject  to  Section  21  below,  Sublandlord  shall  defend,  indemnify  and  hold  harmless  Subtenant  and  its  officers,  directors,  members,
managers, employees, contractors, and agents, from any claim, liability or suit, including attorney fees, on behalf of any party for any
breach of Sublandlord’s representations hereunder and for any default by Sublandlord of any of its covenants and obligations hereunder,
except to the extent caused by the negligence or intentional misconduct of Subtenant (or any of its agents, contractors or employees), or
any Permitted Occupant.

8

 
17. PHYSICAL OCCUPANCY

During  the  Term,  the  Subtenant  shall  not  be  obligated  to  physically  occupy  the  Premises  except  as  required  under  the  Head  Lease;
provided,  however,  that  Subtenant  shall  in  all  cases  be  responsible  to  pay  all  Base  Rent  and  Additional  Rent  as  required  under  this
Sublease.

18. PARKING

The  Subtenant  shall  have  the  right,  but  not  the  obligation,  to  exclusively  access  and  use  the  unreserved  parking  spaces  as  provided
under Section 11.24 of the Head Lease; it being agreed, however, that for purposes of this Sublease, the Required Conditions (as such
term is defined in the Head Lease), shall not be applicable. The Subtenant may exercise such right with respect to any or all of such
parking spaces at any time through the Term upon 15 days’ notice to the Sublandlord.

The Subtenant may terminate such use with respect to any or all such parking spaces with the Sublandlord at any time through the Term
upon 15 days’ notice. During any period during the Term that Subtenant elects not to use the parking spaces provided for under Section
11.24 of the Head Lease, Sublandlord may use such parking spaces; provided, however, that Subtenant shall not be responsible for any
charges, rates or fees for any parking spaces that Subtenant does not elect to so access and use. Except as provided above, Sublandlord
shall not, and shall not permit other parties to, use such parking spaces during the Term.

19. FURNITURE AND EQUIPMENT

Sublandlord shall leave at the Premises as of the Possession Date the following furniture, fixtures, and equipment of Sublandlord that
shall  become  the  property  of  Subtenant  as  of  the  Possession  Date  at  no  cost  or  expense  to  Subtenant:  all  furniture,  fixtures  and
equipment listed on Schedule “C” annexed hereto (“Retained FF&E”);  it  being  agreed  that  title  to  the  Retained  FF&E  shall  vest  in
Subtenant as of the Possession Date and such transfer of title shall occur automatically. Sublandlord hereby represents and warrants that
the Retained FF&E shall be free and clear of all encumbrances, and at Subtenant’s request, Sublandlord shall execute a bill of sale in a
form reasonably acceptable to both parties memorializing the title transfer of the Retained FF&E from Sublandlord to Subtenant.

Sublandlord  shall,  at  its  sole  cost  and  expense,  remove  from  the  Premises  before  the  Possession  Date  all  furniture,  fixtures  and
equipment  that  are  currently  located  in  the  Premises  and  not  specifically  identified  on  Schedule  “C”  annexed  hereto  (collectively,
“Removed FF&E”). Sublandlord shall repair any damage caused by the removal of the Removed FF&E before the Possession Date.

20. WAIVER OF EXTENSION/RENEWAL OPTIONS

Sublandlord  and  Subtenant  agree  that  Subtenant  may  negotiate  and  enter  into  a  direct  lease  with  Head  Landlord  with  respect  to  the
Premises for a term that shall commence upon the expiration of this Sublease Term. Notwithstanding anything to the contrary contained
in the Head Lease, Sublandlord waives any and all rights and options it may have under the Head Lease to extend or renew the term
under the Head Lease, including, without limitation, the option and right granted under Section 11.25 of the Head Lease; it being agreed
that as an inducement to Subtenant to enter into this Sublease, Sublandlord agrees that it hereby waives and shall not exercise any such
renewal  or  extension  rights  under  the  Head  Lease.  Sublandlord  hereby  indemnifies  and  holds  Subtenant  harmless  from  all  costs  and
expenses incurred by Subtenant as a result of Sublandlord’s failure to abide by the provisions of this Section 20.

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21.

INSURANCE; MUTUAL WAIVER; WAIVER OF SUBROGATION

The Sublandlord shall continue to maintain the required insurance coverage pursuant to Article VI of the Head Lease, as tenant under
the Head Lease. The Subtenant shall, during any period of occupancy, at its sole cost and expense, obtain and maintain for the Term
insurance  policies  in  the  amounts  required  under  Article  VI  of  the  Head  Lease  and  naming  Sublandlord  and  Head  Landlord  as
additional insured. Subtenant shall not be permitted to take possession of the Premises until such time as the Subtenant has provided the
Sublandlord with a certificate of insurance demonstrating that such insurance has been obtained. Notwithstanding anything herein to the
contrary, Sublandlord and Subtenant each release and relieve the other, and waive their entire rights of recovery for any injury or death
to any person or for any loss or damage to property located within or constituting a part or all of the Premises or the Building to the
extent that such injury, death, loss or damage is covered by (a) the injured party's insurance, or (b) the insurance the injured party is
required  to  carry  under  this  Sublease  (and  the  Head  Lease  by  incorporation  by  reference),  whichever  is  greater.  This  waiver  applies
regardless  of  whether  the  loss  is  due  to  the  negligent  acts  or  omissions  of  Sublandlord  or  Subtenant,  or  their  respective  officers,
directors, employees, agents, contractors, or invitees. Each of Sublandlord and Subtenant shall have their respective property insurers
endorse the applicable insurance policies to reflect the foregoing waiver of claims. Additionally, (i) Sublandlord and Subtenant shall
each ensure that all of their insurance policies required to be maintained hereunder shall contain a waiver by the insurer of any rights of
subrogation to which such insurer might otherwise be entitled against Sublandlord or Subtenant, as the case may be, or any person for
whom Sublandlord or Subtenant, as the case may be, are in law responsible and (ii) Sublandlord and Subtenant, as the case may be,
shall ensure that all of their respective insurance policies required to be maintained hereunder shall contain a waiver by the insurer of
any rights of subrogation to which such insurer might otherwise be entitled against Sublandlord, Subtenant, or any person for whom
Sublandlord or Subtenant are in law responsible.

22. CONDITIONS — HEAD LANDLORD CONSENT AND NDA

Sublandlord shall request Head Landlord’s consent of this Sublease with reasonable promptness following the parties’ execution and
delivery  of  this  Sublease  and  Sublandlord  shall  use  its  commercially  reasonable  efforts  to  obtain  such  consent,  at  its  sole  cost  and
expense.  Sublandlord  and  Subtenant  shall  negotiate  and  enter  into  a  consent  to  this  Sublease  with  the  Head  Landlord  in  form  and
substance reasonably satisfactory to the parties thereto (the “Head Landlord’s Consent”). If such consent is denied by Head Landlord,
this Sublease shall thereupon terminate and be of no further force or effect.

Within  reasonable  promptness  following  the  parties  execution  and  delivery  of  this  Sublease  and  the  Head  Landlord’s  Consent,
Sublandlord shall request that Head Landlord enter into a non- disturbance and recognition agreement with Subtenant with respect to
the Sublease and Premises in form and substance reasonable acceptable to the Head Landlord, Sublandlord, and Subtenant.

23. SALES TAX

Federal and Provincial sales tax, if applicable, shall be added to all amounts referred to in this Sublease.

10

 
24. DEPOSIT

Within  two  (2)  business  days  of  the  date  Head  Landlord’s  Consent  of  this  Sublease  is  fully-executed,  Subtenant  shall  pay  to
Sublandlord the following deposit (the “Deposit”):

A sum equal to two (2) months Net Rent and Additional Rent plus applicable sales taxes paid by cheque. Half of the Deposit shall be
applied to the first month of Base Rent; and the balance held as security and applied to the last month of Base Rent during the Term.

25. ESTOPPEL CERTIFICATES

Upon Sublandlord’s request, Subtenant agrees to, within twenty (20) days after request, execute and deliver to Sublandlord an estoppel
certificate  in  a  form  reasonably  acceptable  to  Sublandlord  and  Subtenant,  with  appropriate  exceptions  to  the  statements  therein.
Subtenant acknowledges that a purchaser or lender may rely upon the truth of the matters set forth in any such estoppel certificate.

26. NOTICE

Any notice under this Sublease must be in writing and be personally delivered, delivered by recognized overnight courier service or
given by mail or email. Any notice given by mail must be sent, postage prepaid, by certified or registered mail, return receipt requested.
All notices must be addressed to the parties at the following addresses or at such other addresses as the parties may from time to time
direct in writing:

Sublandlord:

With a copy to:

Subtenant:

SIERRA ONCOLOGY CANADA ULC
Attn: Justine Clark, Manager HR Operations
355 Burrard Street, Suite 1000
Vancouver, BC V6C 2G8
Email: jclark@sierraoncology.com

SIERRA ONCOLOGY CANADA ULC
Attn: Christina Thomson, General Counsel
355 Burrard Street, Suite 1000
Vancouver, BC V6C 2G8
Email: cthomson@sierraoncology.com

Summit Law Group, PLLC
315 5th Avenue S, Suite 1000
Seattle, WA 98104
Email: ians@summitlaw.com

SCOUGALL MANAGEMENT (1987) LIMITED
Suite 2100,
Scotia Plaza
40 King St West,
Toronto, Ontario
M5H 3C2
Attn: Chief Operating Officer
Email: JTsiofas@cassels.com

11

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
With a copy to:

SCOUGALL MANAGEMENT (1987) LIMITED
Suite 2100,
Scotia Plaza
40 King St West,
Toronto, Ontario
M5H 3C2

Attention:

Managing Partner

Email: MBennett@cassels.com

Any notice will be deemed to have been given, if personally delivered, when delivered, and if delivered by overnight courier service
(e.g., FedEx), one (1) business day after deposit with such overnight courier service, and if mailed, two (2) business days after deposit
at  any  post  office  in  Canada,  and  if  delivered  via  email,  the  same  day  such  email  is  verified  as  sent;  provided  that  if  any  such
verification occurs after 5 p.m. Pacific Time on a business day, or at any time on a Saturday, Sunday or holiday, such verification will be
deemed to have occurred as of 9 a.m. Pacific Time on the following business day.

27. ENTIRE AGREEMENT; MERGER AND WAIVER

This Sublease supersedes and cancels all previous negotiations, arrangements, offers, agreements or understandings, if any, between the
parties. This Sublease expresses and contains the entire agreement of the parties and there are no express or implied representations,
warranties  or  agreements  between  them,  except  as  contained  in  this  Sublease.  This  Sublease  may  not  be  modified,  amended  or
supplemented except by a writing signed by both Sublandlord and Subtenant. No consent given or waiver made by Sublandlord of any
breach of Subtenant of any provision of this Sublease shall operate or be construed in any manner as a waiver of any subsequent breach
of the same or of any other provision.

28. BENEFIT

This Sublease shall benefit and bind the parties hereto and their respective successors and assigns.

29. SEVERABILITY

If any provision of this Sublease is found to be unenforceable, the remainder of this Sublease shall not be affected thereby.

30. AMENDMENTS

This Sublease may be amended or modified only by a written instrument executed by Sublandlord and Subtenant.

31. ATTORNEY FEES

In  any  action  filed  in  connection  with  a  dispute  concerning  the  meaning,  interpretation,  or  enforcement  of  any  provision  of  this
Sublease, the party not prevailing in the dispute shall pay any and all costs and expenses incurred by the other party in enforcing or
establishing its rights under this Sublease.

12

 
 
 
 
 
 
 
 
 
 
 
 
32. AUTHORITY

Each  individual  executing  and  delivering  this  Sublease  represents  and  warrants  that  she/he  has  the  authority  to  do  so  and  to  bind
Sublandlord and Subtenant, respectively, to this Sublease.

33. LIMITATION OF LIABILITY

Notwithstanding  anything  herein  to  the  contrary,  neither  party  hereto  shall  be  liable  for  any  indirect  or  consequential  damages.
Notwithstanding  anything  to  the  contrary  contained  in  this  Sublease  or  the  Head  Lease,  no  past,  current  or  future  partner,  member,
manager,  officer,  director  or  shareholder  of  Subtenant  or  Sublandlord  will  have  any  personal  liability  under  this  Sublease  or  be
personally liable for breach of any covenant or obligation of Subtenant or Sublandlord, respectively, under this Sublease, and neither
Sublandlord nor Subtenant shall have recourse against the assets of any such person for any payment due under this Sublease or for
damages awarded Sublandlord or Subtenant, respectively as a result of Sublandlord’s or Subtenant’s breach of this Sublease.

34. RISK

Except as otherwise expressly provided in this Section, all of Subtenant's personal property of any kind or description whatsoever in the
Premises or Building shall be at Subtenant's sole risk.

Sublandlord and Head Landlord shall not be liable for any damage done to or loss of such personal property, injury to person or damage
or  loss  suffered  by  the  business  or  occupation  of  Subtenant  arising  from  any  acts  or  neglect  of  co-tenants  or  other  occupants  of  the
Building,  or  of  any  other  persons,  or  from  bursting,  overflowing  or  leaking  of  water,  sewer  or  steam  pipes,  or  from  the  heating  or
plumbing or sprinkler fixtures, or from electric wires, or from gas, or odors, or caused in any other manner whatsoever unless and to the
extent  the  damage  is  caused  by  the  willful  misconduct  or  negligence  of  Sublandlord  or  Head  Landlord  (or  any  of  their  agents,
contractors or employees) or breach of Sublandlord's obligations under this Sublease.

35. REPRESENTATION

Each of Sublandlord and Subtenant acknowledge that Salespersons Stan Krawitz (Savills Inc.) and co-broker Jon Bishop (Devencore
Company Ltd.) (the “Subtenant’s Agent”) represents the Subtenant in this transaction and Salespersons John Wu and Destry Straight
(Devencore Company Ltd) are designated agents for the Sublandlord. All brokerage fees in connection with this transaction shall be
paid by the Sublandlord. It is agreed that the Subtenant Agent’s portion of the commission shall be an amount equal to two (2) months
achieved  Base  Rent  and  Additional  Rent  plus  GST  and  shall  be  payable  by  the  Sublandlord  upon  the  Commencement  Date  and  the
payment of the first monthly installment of rent hereunder. Sublandlord and Subtenant each acknowledge that the information provided
by the Sublandlord’s designated agent is not to be construed as expert legal, tax or environmental advice and the parties are cautioned
not  to  rely  on  any  such  information  without  seeking  specific  legal,  tax  or  environmental  advice  with  respect  to  their  unique
circumstances.

36. SCAN EMAIL AND COUNTERPARTS

The Sublandlord and Subtenant acknowledge that this Sublease may be by email and signed on a scanned and emailed copy (e.g., an
Adobe .pdf). Both parties accept the scanned and emailed copy as a legal and binding document. This Sublease may be executed in any
number of counterparts and all such counterparts shall, for all purposes, constitute one agreement as of the date first indicated above

13

 
binding on all the parties hereto notwithstanding that all parties are not signatories to the same counterpart, provided that each party has
signed at least one counterpart.

Time is of the essence of this Sublease and each part of it.

[SIGNATURE PAGE FOLLOWS; REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

14

 
 
 
The Subtenant has executed this Sublease at Toronto this 3rd day of December, 2020.

SCOUGALL MANAGEMENT (1987) LIMITED

DocuSigned by:

  Per: /s/ John Tsiofas
John Tsiofas
Chief Operating Officer

The Sublandlord has executed this Sublease at Vancouver this 1st day of December, 2020.

SIERRA ONCOLOGY CANADA ULC

DocuSigned by:

  Per: /s/ Stephen Dilly
Stephen Dilly
President & Chief Executive Officer

15

 
 
 
 
   
 
 
   
 
 
   
 
   
 
   
 
 
 
 
 
 
   
 
 
   
 
 
   
 
   
 
   
 
 
 
SCHEDULE “A”

Hornby Street lane

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SCHEDULE “B”

COPY OF HEAD LEASE

Schedule B-1

 
 
 
 
 
 
 
 
 
 
 
H S B C BUILDING

OFFICE LEASE

BETWEEN

VAN885 WEST GEORGIA LP by its general partner, 
VAN885 WEST GEORGIA GP LTD. and ONTREA INC., 
both by their duly authorized agent, 
THE CADILLAC FAIRVIEW CORPORATION LIMITED

(Landlord)

-AND-

SIERRA ONCOLOGY CANADA ULC

(Tenant)

HSBC Building 
885 West Georgia Street 
Vancouver, British Columbia

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TABLE OF CONTENTS

ARTICLE I - BASIC PROVISIONS

Section 1.01 Term Sheet
Section 1.02 Grant and Premises
Section 1.03 Term
Section 1.04 Construction of Premises
Section 1.05 Use and Conduct of Business

ARTICLE II - RENT

Section 2.01 Covenant to Pay
Section 2.02 Net Rent
Section 2.03 Payment of Operating Costs
Section 2.04 Payment of Taxes
Section 2.05 Payment of Estimated Taxes and Operating Costs
Section 2.06 Additional Rent
Section 2.07 Rent Past Due
Section 2.08 Utilities
Section 2.09 Adjustment of Areas
Section 2.10 Net Lease
Section 2.11 Electronic Funds Transfer
Section 2.12 Prepaid Rent

ARTICLE Ill - CONTROL OF BUILDING

Section 3.01 Landlord's Services
Section 3.02 Alterations by Landlord
Section 3.03 Telecommunication Service Providers
Section 3.04 Riser Rooms

ARTICLE IV - ACCESS AND ENTRY

Section 4.01 Entry for Inspection and Work
Section 4.02 Right to Show Premises
Section 4 .03 Entry not Forfeiture

ARTICLE V - MAINTENANCE, REPAIRS AND ALTERATIONS

Section 5.01 Maintenance By Landlord
Section 5.02 Maintenance by Tenant; Compliance with Laws
Section 5.03 Tenant's Alterations
Section 5.04 Repair Where Tenant at Fault
Section 5.05 Removal of Improvements and Fixtures
Section 5.06 Liens
Section 5.07 Notice by Tenant
Section 5.08 Not to Overload Floors
Section 5.09 Use of Hazardous Substances
Section 5.10 Removal of Hazardous Substances

ARTICLE VI - INSURANCE AND INDEMNITY

Section 6.01 Tenant's lnsurance
Section 6.02 Increase in Insurance Premiums
Section 6.03 Cancellation of Insurance
Section 6 .04 Loss or Damage
Section 6.05 Landlord's Insurance
Section 6.06 Indemnification By the Tenant
Section 6.07 Release By the Landlord

ARTICLE VII - DAMAGE AND DESTRUCTION

Section 7.01 No Abatement or Termination
Section 7.02 Damage to Premises
Section 7.03 Right of Termination
Section 7.04 Destruction of or Damage to Building
Section 7.05 Architect's Certificate

ARTICLE VIII - ASSIGNMENT, SUBLETTING AND TRANSFERS
Section 8.01 Assignments, Subleases and Transfers
Section 8.01 A Transfer to a Permitted Transferee
Section 8.02 Landlord's Rights
Section 8.03 Conditions of Transfer
Section 8.04 Change of Control
Section 8.05 No Advertising
Section 8.06 Assignment By Landlord

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ARTICLE IX - DEFAULT
Section 9.01 Default and Remedies
Section 9.02 Distress
Section 9.03 Damages and Costs
Section 9.04 Allocation of Payments
Section 9.05 Survival of Obligations

ARTICLE X - STATUS STATEMENT, ATTORNMENT AND SUBORDINATION

Section 10.01 Status Statement
Section 10.02 Subordination
Section 10.03 Attornment
Section 10.04 Execution of Documents

ARTICLE XI - GENERAL PROVISIONS

Section 11.01 Rules and Regulations
Section 11.02 Delay
Section 11.03 Overholding
Section 11.04 Waiver
Section 11.05 Registration
Section 11.06 Notices
Section 11.07 Successors
Section 11.08 Joint and Several Liability
Section 11.09 Captions and Section Numbers
Section 11.10 Extended Meanings
Section 11.11 Partial Invalidity
Section 11.12 Entire Agreement
Section 11.13 Governing Law
Section 11.14 Time of the Essence
Section 11.15 Quiet Enjoyment.
Section 11.16 Energy Conservation
Section 11.17 Indemnity Agreement
Section 11.18 Confidentiality
Section 11.19 Execution
Section 11.20 Accord and Satisfaction
Section 11.21 Head Lease
Section 11.22 Landlord's Limited Recourse and Severability
Section 11.23 Tenant Inducement
Section 11.24 Parking
Section 11.25 Option to Extend
Section 11.26 Subject to Vacant Possession

SCHEDULE "A" - LEGAL DESCRIPTION OF THE LANDS

SCHEDULE "B" - FLOOR PLAN OF THE PREMISES

SCHEDULE "C" - DEFINITIONS

SCHEDULE "D" - RULES AND REGULATIONS

SCHEDULE "E" - ENVIRONMENTAL MANAGEMENT PLAN

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THIS LEASE is dated the 12th day of June, 2017

B E T W E E N:

VAN885 WEST GEORGIA LP by its general partner,
VAN885 WEST GEORGIA GP LTD. and ONTREA INC.,

both by their duly authorized agent,

THE CADILLAC FAIRVIEW CORPORATION LIMITED

(collectively, the "Landlord")

- and -

SIERRA ONCOLOGY CANADA ULC

(the "Tenant")

ARTICLE I - BASIC PROVISIONS

Section 1.01 Term Sheet

The following are certain basic terms and provisions which are part of, may be referred to and are more fully specified in this Lease. If there is a discrepancy between the terms and provisions of
this Section  1.01 and any other Section of the Lease, the provisions of such other Section of the Lease shall prevail.

(a) Building:
(b) Premises Number

HSBC Building, 665 West Georgia Street, Vancouver, British Columbia
Suite 2150, located on the 21st floor of the Building .

(c) Rentable Area of

Approximately Eight Thousand Three Hundred Forty Seven (8,347) square feet.

Premises:

(d) BOMA Standard:

ANSI Z65.1-1980.

(e) Term :

  Extension of Term:

Subject to Section 11.25, the Term of this Lease is five (5) years from the 1st day of March, 2018 (the "Commencement Date") to the 28th day of February
2023.
1 x 5 Years, subject to Section 11.25.

(f) Net Rent:

(i) during the period of the Term from the Commencement Date to and including February 28, 2019, THIRTY THREE DOLLARS ($33.00) per square fool

of the Rentable Area of the Premises per annum;

(ii) during the period of the Term from March 1, 2019 to and including February 29, 2020, THIRTY THREE DOLLARS FIFTY CENTS ($33.50) per

square fool of the Rentable Area of The Premises per annum;

(iii) during the period of the Term from March 1, 2020 to and including February 28, 2021, THIRTY FOUR DOLLARS ($34.00) per square foot of the

Rentable Area of The Premises per annum;

(iv) during the period of the Term from March 1, 2021 to and including February 28, 2022, THIRTY FOUR DOLLARS FIFTY CENTS ($34.50) per square

foot of the Rentable Area of The Premises per annum; and

(v) during the remainder of the Term, THIRTY FIVE DOLLARS ($35.00) per square foot of the Rentable Area of The Premises per annum.

(g) Possession Date:

Subject to Section 11.26, the date which is the later of: (i) the dale this Lease is executed, or (ii) March 1, 2018.

(h) Fixturing Period:

INTENTIONALLY DELETED.

(i) Prepaid Rent:

EIGHTY SIX THOUSAND AND FIFTY DOLLARS ($86,050.00) (See Section 2.12).

(j) Tenant's Address:

Suite 2150, 885 West Georgia Street Vancouver, British Columbia V6C 3E8

Section 1.02 Grant and Premises

In consideration of the performance by the Tenant of its obligations under this Lease, the Landlord leases the Premises to the Tenant for the Tenn. The Premises are as shown on the floor plan
attached as Schedule "B" and contain a Rentable Area as set out in Section 1.01 (c).

Section 1.03 Term

The Term of this Lease is the period set out in Section 1.01 (e). If the Commencement Date set out in Section 1.01 (e) is not a fixed date, within a reasonable time after the Commencement Date
occurs, the Landlord will confirm the Commencement Date by notice to the Tenant and such confirmed Commencement Date will apply for this Lease.

HSBC Office Master Mar 2012
SIERRA ONCOLOGY-HSBC 2150-MAY 2 2017/L T

-1-

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Section 1.04 Construction of Premises

The Tenant shall abide by the provisions of this Lease and the Tenant Construction Manual for any construction it proposes to do prior to or upon occupancy of the Premises, and any Alterations
to the Premises after it takes occupancy. The Tenant agrees to accept the Premises in their current "as is" condition, subject to any Landlord's work expressly set out herein. Notwithstanding the
foregoing, on or before the Commencement Date, but in no event prior to thirty (30) days after full execution of this Lease, the Landlord, at its sole costs, shall complete the following
(collectively, the "Landlord's Work"):

(a)

(b)

(c)

(d)

(e)

ensure base building lighting, HVAC and electrical equipment are in good working order in accordance with base building standard;

ensure window coverings within the Premises are in good working order in accordance with base building standard;

replace all damaged and/or soiled ceiling tiles within the Premises in accordance with base building standard;

ensure the demising walls separating the Premises from adjacent premises span from the floor up to the underside of the concrete slab; and

replace existing thermostats throughout the Premises with digital control units in accordance with base building standard.

It is understood and agreed that the Landlord is not required to provide any materials or to do any work to or in respect of the Premises except the Landlord's Work.

Section 1.05 Use and Conduct of Business

The Premises shall be used only for general office use and for no other purpose. The Tenant shall conduct its business in the Premises in a reputable and first class manner, and in no event will the
Premises be used for any purpose which is inconsistent with the image and quality of the Building or which could result in exceptional demands being placed upon any of the systems or common
areas of the Building, as determined by the Landlord. If the Tenant is a corporation, the Tenant will be either incorporated or extra-provincially registered in the Province and will remain in good
standing during the Term with the Registrar of Companies for the Province with respect to filing annual reports.

Section 2.01 Covenant to Pay

ARTICLE II - RENT

(a)

(b)

Except as otherwise expressly provided in this Lease, the Tenant shall pay Rent from the Commencement Date without prior demand and without any deduction, abatement, setoff or
compensation . If the Commencement Date is not on the first day of a calendar month, or the period of time from the Commencement Date to the end of the first Fiscal Year during the
Term is less than twelve (12) calendar months, or the period of time from the last Fiscal Year end during the Tenm to the end of the Tenn is less than twelve (12) calendar months, then
Rent for such month and such periods shall be pro-rated on a per diem basis, based upon a period of 365 days.

The Tenant will deliver to the Landlord on each Fiscal Year end throughout the Term, a series of monthly post-dated cheques for the next ensuing twelve month period, for the total of the
monthly payments of Net Rent and any Additional Rent estimated by the Landlord in advance.

Section 2.02 Net Rent

The Tenant shall pay the Net Rent set out in Section 1.01 (f) in advance, in equal monthly installments on the first day of each calendar month of the Term. As soon as reasonably possible after
completion of construction of the Premises, the Landlord shall measure the Useable Area of the Premises and shall calculate the Rentable Area of the Premises in accordance with the BOMA
Standard, and Rent shall be adjusted accordingly.

Section 2.03 Payment of Operating Costs

The Tenant shall pay to the Landlord the Tenant's Proportionate Share of Operating Costs.

Section 2.04 Payment of Taxes

(a)

(b)

(c)

The Tenant shall pay when due all Business Tax. If the Business Tax is payable by the Landlord to the relevant taxing authority, the Tenant shall pay the amount thereof to the Landlord or
as it directs. If no separate tax bills for Business Tax are issued with respect to the Tenant or the Premises, the Landlord may allocate Business Tax charged, assessed or levied against the
Building or the Lands to the Tenant on the basis of the Tenant's Proportionate Share.

The Tenant shall pay to the Landlord its share of Taxes, which share shall be determined on the basis of the Tenant's Proportionate Share or on such other reasonable and equitable basis as
the Landlord may determine.

If the Landlord obtains a written statement from the assessment or taxing authorities indicating that as a result of any construction or installation of improvements in the Premises, or any
act  or  election  of  the  Tenant,  or  the  exemption  from  taxation  at  full  commercial  rates  of  any  part  of  the  Building,  the  Taxes  payable  by  the  Tenant  under  subsection  2.04(b)  do  not
accurately reflect the Tenant's proper share of Taxes, the Landlord may require the Tenant to pay such revised amount as is determined by the Landlord, acting reasonably.

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(d)

(e)

(f)

The Landlord may: contest any Taxes and appeal any assessments with respect thereto; withdraw any such contest or appeal; and agree with the taxing authorities on any settlement or
compromise with respect to Taxes. The Tenant will co-operate with the Landlord in respect of any such contest or appeal and will provide the Landlord with all relevant information,
documents and consents required by the Landlord in connection with any such contest or appeal. The Tenant will not contest any Taxes or appeal any assessments related thereto without
the Landlord's prior written consent.

The Tenant shall promptly deliver to the Landlord on request, copies of assessment notices, tax bills and other documents received by the Tenant relating to Taxes and Business Tax and
receipts for payment of Taxes and Business Tax payable by the Tenant.

The Tenant shall on demand, pay to the Landlord or to the appropriate taxing authority if required by the Landlord, all goods and services taxes, sales taxes, value added taxes, business
transfer taxes, or any other taxes imposed on the Landlord with respect to Rent or in respect of the rental of space under this Lease, whether characterized as a goods and services tax, sales
tax, value added tax, business transfer tax or otherwise. The Landlord shall have the same remedies and rights with respect to the payment or recovery of such taxes as it has for the
payment or recovery of Rent under this Lease.

Section 2.05 Payment of Estimated Taxes and Operating Costs

(a)

The amount of Taxes and Operating Costs may be estimated by the Landlord for such period as the Landlord determines from time to time, and the Tenant agrees to pay to the Landlord
the amounts so estimated in equal installments, in advance, on the first day of each month during such period. Notwithstanding the foregoing, when bills for all or any portion of the
amounts so estimated are received, the Landlord may bill the Tenant for the Tenant's Proportionate Share thereof (or the amount determined under Section 2.04(c)) after crediting against
such amounts any monthly payments of estimated Taxes and Operating Costs previously made by the Tenant and the Tenant shall pay the Landlord the amounts so billed.

(b) Within a reasonable time after the end of the period for which such estimated payments have been made, the Landlord shall submit to the Tenant a statement showing the calculation of the
Tenant's share of Taxes and Operating Costs together with a report from the Landlord's auditor as to the total of the amounts included in Operating Costs. If: (i) the amount the Tenant has
paid is less than the amounts due, the Tenant shall pay such deficiency to the Landlord within thirty (30) days of delivery of such Landlord's statement; or (ii) the amount paid by the
Tenant is greater than the amounts due, the Landlord shall pay such excess to the Tenant within thirty (30) days of delivery of such Landlord's statement.

(c)

(d)

(e)

(f)

The obligations contained in this Section shall survive the expiry or earlier termination of the Term. Failure of the Landlord to render any statement of Taxes or Operating Costs shall not
prejudice the Landlord's right to render such statement thereafter or with respect to any other  period.  The  rendering  of  any  such  statement  shall  also  not  affect  the  Landlord's  right  to
subsequently render an amended or corrected statement.

The Tenant shall not claim a re-adjustment in respect of Operating Costs or Taxes or other items of Additional Rent estimated by the Landlord or the share payable by the Tenant on
account thereof for any Fiscal Year except by notice given to the Landlord within one hundred and eighty (180) days after delivery of the statement, stating the particulars of the error in
computation.

If the time or method of collection of Taxes by the municipal, provincial, parliamentary, or other authority shall become different from the time or method of collection of Taxes which
exists at the date of the execution of this Lease, the Landlord shall have the right to change the time or method of the collection of the Tenant's Proportionate Share of Taxes such that the
Tenant's  Proportionate  Share  of  Taxes  for  the  calendar  year  shall  be  fully  paid  to  the  Landlord  by  such  time  or  times  as  the  Taxes  are  due  and  owing  to  the  municipal,  provincial,
parliamentary or other authority.

Whenever any part or parts of the Operating Costs and/or Taxes are, in the reasonable opinion of the Landlord, attributable to certain premises or classes of premises in the Building, the
Landlord may attribute such part or parts thereof to such premises or classes of premises respectively (the "Designated Premises"). If and whenever the Premises constitute all or a part of
the Designated Premises with respect to any such part or parts of the Operating Costs and/or Taxes, the Tenant's share (the "Share") thereof shall be a fraction thereof, the numerator of
which is the Rentable Area of the Premises or the part thereof within the Designated Premises and the denominator of which is the Rentable Area of the Designated Premises.

Section 2.06 Additional Rent

Except as otherwise provided in this Lease, all Additional Rent shall be payable by the Tenant to the Landlord within five (5) business days after demand.

Section 2.07 Rent Past Due

All Rent past due shall bear interest from the date on which the same became due until the date of payment at five percent (5%) per annum in excess of the prime interest rate for Canadian Dollar
demand loans announced from time to time by any Canadian chartered bank designated by the Landlord. Such interest shall be calculated on a daily basis and compounded monthly from the time
such amounts first become due and payable until such amounts and all interest thereon are paid in full by the Tenant to the Landlord.

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Section 2.08 Utilities

(a)

(b)

(c)

The Tenant shall pay to the Landlord, or as the Landlord directs, all gas, electricity, water, steam and other utility charges applicable to the Premises on the basis of the Rentable Area of
the Premises. Charges for utilities shall be payable in advance on the first day of each month at a basic rate determined by the Landlord's engineers. The Landlord shall be entitled to
allocate to the Premises an additional charge, as determined by the Landlord's engineer, for any supply of utilities to the Premises in excess of those covered by such basic charge. If any
utility rates or related taxes or charges are increased or decreased during the Term, such charges shall be equitably adjusted and the decision of the Landlord, acting reasonably, shall be
final and binding with respect to any such adjustment.

The Landlord shall have the exclusive right to replace bulbs, tubes and ballasts in the lighting system in the Premises, on either an individual or a group basis. The Tenant shall pay the
cost of such replacement on the first day of each month or at the option of the Landlord upon demand.

The Tenant shall pay the cost of installing, inspecting, verifying, maintaining and repairing any meters or metering system installed at the request of the Landlord or the Tenant to measure
the  usage  of  utilities  in  the  Premises.  Where  a  base  building  metering  system  has  been  installed  in  the  Building,  the  Landlord  will  provide,  at  the  Tenant's  expense,  all  necessary
components and programming to connect the Premises to the Landlord's metering system.

Section 2.09 Adjustment of Areas

The  Landlord  may  from  time  to  time  re-measure  the  Useable  Area  of  the  Premises  or  re-calculate  the  Rentable  Area  of  the  Premises  and  may  re-adjust  the  Net  Rent  and/or  the  Tenant's
Proportionate  Share  of  Additional  Rent  accordingly.  The  effective  date  of  any  such  re-adjustment  shall:  (a)  in  the  case  of  an  adjustment  to  the  Rentable  Area  resulting  from  a  change  in  the
aggregate Useable Area of all office premises on the floor on which the Premises are situated, be the date on which such change occurred; and (b) in the case of a correction to any measurement
or  calculation  error,  be  the  date  as  of  which  such  error  was  introduced  in  the  calculation  of  Rent.  Any  necessary  adjusting  payment  will  be  made  by  the  party  responsible  for  that  payment
forthwith upon the amount of the adjusting payment being determined.

Section 2.10 Net Lease

This Lease is a completely net lease to the Landlord, except as expressly herein set out. The Landlord is not responsible for any expenses or outlays of any nature arising from or relating to the
Premises, or the use or occupancy thereof, or the contents thereof or the business carried on therein. The Tenant shall pay all charges, impositions and outlays of every nature and kind relating to
the Premises except as expressly herein set out.

Section 2.11 Electronic Funds Transfer

At the Landlord's request, the Tenant will participate in an electronic funds transfer ("EFT") system or similar system whereby the Tenant will authorize its bank, trust company, credit union or
other financial institution to credit the Landlord's bank account each month in an amount equal to the Net Rent and Additional Rent payable on a monthly basis pursuant to the provisions of this
Lease.

Section 2.12 Prepaid Rent

The Landlord acknowledges receipt from the Tenant of prepaid rent in the amount set out in Section 1.01(i), which shall be held by the Landlord without interest until the expiry of
the Term as it may be extended from time to time (hereinafter in this section referred to as the "Term") as non-refundable pre-paid rent for application to the period immediately
preceding the expiry of the Term (the "Prepaid Rent"). In the event that the Tenant is in default of the payment of Rent under this Lease during the Term, and if the Tenant has not
cured such default within the notice period set out in this Lease, the Landlord shall be entitled, upon expiry of such notice period, to draw upon the Prepaid Rent in whole or in part,
without notice to the Tenant, and apply same to such arrears. Further, in the event that this Lease is terminated by the Landlord in accordance with Article IX of this Lease prior to
the expiry of the Term, it is agreed by the Tenant that the Landlord shall be entitled to apply, at its option, the Prepaid Rent to any arrears of Rent up to and including the date of
termination, and thereafter to the Landlord's damages caused as a result of the breach and the forfeiture of the Lease, all without prejudice to the Landlord's rights to recover the
balance of any loss, damages or expense which the Landlord has suffered as a result termination of this Lease. If the Landlord has applied all or a portion of the Prepaid Rent against
any arrears in accordance with this Section, the Tenant shall replenish the Prepaid Rent to its original amount by delivering to the Landlord a sufficient amount by bank draft or
certified cheque upon five (5) days of the Landlord's written demand to the Tenant. The Tenant acknowledges and confirms that if the Prepaid Rent is held by the manager of the
Building, such Prepaid Rent shall be held by the manager of the Building as agent of the Landlord.

In the event that the Tenant becomes bankrupt or takes the benefit of any statute for bankrupt or insolvent debtors (including, without limiting the generality of the foregoing, the
Companies Creditors' Arrangement Act R.S.C. 1985, c.C-36, as amended or replaced) prior to expiry of the Term, then notwithstanding anything to the contrary contained in such
legislation for bankrupt or insolvent debtors, the Tenant agrees that the Landlord shall be entitled to retain the Prepaid Rent for application to any amount of Rent in arrears or
accelerated Rent under this Lease and, in the event that this Lease is repudiated or disclaimed by the Tenant, a trustee in bankruptcy or a court representative, then to the Landlord's
damages which it has suffered as a result of such early termination of this Lease.

Prior to the expiry of the Term, the Landlord shall apply the remainder of the Prepaid Rent (if any) to Rent payable for the last month(s) of the Term or such portion thereof as
applicable, provided the Tenant shall remain responsible for any Rent that remains unpaid, including any amount in connection with adjustments of Additional Rent.

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Section 3.01 Landlord's Services

ARTICLE III - CONTROL OF BUILDING

(a)

(b)

(c)

(d)

(e)

(f)

The Landlord shall provide climate control to the Premises during Normal Business Hours to maintain a temperature adequate for normal occupancy, except during the making of repairs,
alterations or improvements, provided that the Landlord shall have no liability for failure to supply climate control service when stopped as aforesaid or when prevented from doing so by
repairs, or causes beyond the Landlord's reasonable control.

Subject to the Rules and Regulations, the Landlord shall provide elevator service during Normal Business Hours for use by the Tenant in common with others, except when prevented by
repairs. The Landlord will operate at least one passenger elevator for use by tenants at all times except in the case of fire or other emergencies.

The  Landlord  will  provide  cleaning  services  in  the  Building  consistent  with  the  standards  of  a  first  class  office  building  (excluding  interior  glass  areas  and  areas  used  exclusively  for
computer equipment) provided that the Tenant at the end of each business day shall provide access to the persons performing the janitor services and leave the Premises in a reasonably
clean and tidy condition.

Subject to Section 2.08, the Landlord shall make available to the Premises electricity for normal lighting and miscellaneous power requirements and, in normal quantities gas, water, and
other public utilities generally made available to other tenants of the Building by the Landlord.

The Tenant shall not install any equipment or systems that will exceed, or overload the capacity or interfere with the normal operation of the heating. ventilating or air-conditioning or any
other service or facility in the Building and agrees that if any equipment or systems installed by the Tenant requires additional heating, ventilating or air-conditioning equipment system or
any other service or facility, as determined by the Landlord acting reasonably, the same shall be installed at the Tenant's expense . If installation of any equipment, fixture or system on the
Premises by the Tenant necessitates rebalancing or readjustment of the heating, ventilating and air-conditioning system by the Landlord, the same will be performed by the Landlord at the
Tenant's sole expense. The Tenant shall not, without the Landlord's prior written consent in each instance, connect any equipment, fixtures, systems or appliances (other than normal office
electrical fixtures, computers, typewriters, word processors, small office machines and lamps) to the Building's electric distribution system or make any alteration or addition to the electric
system of the Premises.

Wherever this Lease provides that the Tenant is to pay a cost or expense to the Landlord as an item of Additional Rent (except for Operating Costs, Taxes, Premises utilities and the 15%
administration fee referred to in this Section), the Tenant shall pay, in addition to such cost or expense, the Landlord's administration charge of 15% of such cost or expense, which cost
shall also be an item of Additional Rent. The Tenant shall pay to the Landlord the costs of all such services provided at the Tenant's request or otherwise provided for herein and which are
not included in Operating Costs including, without limitation: (i) the provision of HVAC services outside of Normal Business Hours or utilities of a special nature; (ii) replacement of non-
standard electric light fixtures, ballasts, tubes, starters, lamps, light bulbs and controls; (iii) special janitorial or cleaning services; (iv) special security services; (v) locksmith services; (vi)
operating elevators used or reserved for the sole benefit of the Tenant and supervising the operation of the elevator and movement of furniture, equipment, freight and supplies for the
Tenant; (vii) construction of any Leasehold Improvements or other work performed at the request of or on behalf of the Tenant; and (viii) other services performed at the request of or on
behalf of the Tenant.

Section 3.02 Alterations by Landlord

The Landlord may:

(a)

(b)

(c)

(d)

alter, add to, subtract from, construct improvements to, rearrange, build additional storeys on and construct additional facilities in, adjoining or near the Building;

relocate the facilities and improvements comprising the Building or erected on the Lands, or alter or relocate the Premises, in which case the Landlord will provide the Tenant with not less
than one hundred and eighty (180) days prior written notice, provided that the premises as relocated, altered, or rearranged shall be in all material aspects comparable to the
Premises with respect to elevator exposure and the floor level, which shall not be lower than the thirteenth (13th) floor, and provided that 60% of any relocated premises shall
be on the same side of the Building as the Premises and that the Landlord shall ensure that the relocated premises are ready for occupancy prior to requiring the Tenant to
vacate the Premises. Such notice will contain a floor plan showing the location of the altered or relocated premises (the "Relocated Premises") which will contain substantially the same
Rentable Area as the Premises. The Landlord will provide leasehold improvements in the Relocated Premises at its sole cost and expense, of a quality substantially equal to those in the
Premises,  on  or  before  the  date  of  relocation  and  the  Tenant  will  provide  vacant  possession  of  the  Premises  on  the  relocation  date  set  out  in  the  notice.  In  the  event  the  Landlord
exercises its right to relocate the Premises, the Landlord shall, in addition to providing leasehold improvements in the Relocated Premises as provided aforesaid, reimburse the
Tenant  for  the  reasonable  direct  costs  of:  (1)  relocating  furniture,  telephones  and  computer  equipment;  (2)  replacing  personalized  stationery  on  hand  which  is  no  longer
addressed  correctly;  and  (3)  regulatory  filings  required  under  applicable  securities  laws  as  a  result  of  the  Tenant's  change  of  address,  if  any,  each  of  which  costs  shall  be
supported by invoice copies to the Landlord.

do such things on, or in the Lands or Building as are required to comply with any laws, by-laws, regulations, orders or directives affecting the Lands or any part of the Building; and

do such other things on or in the Lands or Building as the Landlord, in the use of good business judgment determines to be advisable;

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provided that notwithstanding anything contained in this Section, access to the Premises or the Relocated Premises, as the case may be, shall at all times be available from the elevator lobby. In
exercising the foregoing rights, the Landlord shall use its reasonable efforts (i) not to unreasonably interfere with the business operations of the Tenant in the Premises; (ii) to complete
its  work  as  expeditiously  as  possible  under  the  circumstances  and  during  non-business  hours  wherever  reasonably  possible  provided  there  is  no  additional  cost  incurred  by  the
Landlord; and (iii) except in the case of an emergency where no notice shall be required, to provide the Tenant with reasonable prior written notice.

The Landlord shall not be in breach of its covenant for quiet enjoyment or liable for any loss, costs or damages, whether direct or indirect, incurred by the Tenant due to any of the foregoing.

Section 3.03 Telecommunication Service Providers

The Tenant may utilize a registered telecommunication service provider of its choice upon prior written notice to the Landlord, subject to the provisions of this Lease including but not limited to
the following:

(a)

(b)

(c)

(d)

the service provider shall execute and deliver the Landlord's standard form of license agreement which shall include a provision for the Landlord to receive compensation for the use of the
space for the service provider's equipment and materials;

the Landlord shall incur no expense or liability whatsoever with respect to any aspect of the provision of telecommunication services, including without limitation, the cost of installation,
service, materials, repairs, maintenance, interruption or loss of telecommunication service;

the Landlord must first reasonably determine that there is sufficient space in the risers of the Building for the installation of the service provider's equipment and materials; and

the Tenant shall indemnify and hold harmless the Landlord for all losses, claims, demands, expenses and judgments against the Landlord caused by or arising out of, either directly or
indirectly, any acts or omissions by the service provider (or those for whom it is responsible at law) for or on behalf of the Tenant.

The Tenant shall be responsible for the costs associated with the supply and installation of telephone, computer and other communication equipment and systems and related wiring within the
Premises  to  the  boundary  of  the  Premises  for  hook  up  or  other  integration  with  telephone  and  other  communication  equipment  and  systems  of  a  telephone  or  other  communication  service
provider, which equipment and systems of the service provider are located or are to be located in the Building pursuant to the Landlord's standard form of license agreement.

The Landlord shall supply space in risers in the Building and space on floor(s) of the Building in which the Premises are located, the location of which shall be designated by the Landlord in its
discretion, to telecommunication service providers who have entered into the Landlord's standard fonn of license agreement for the purpose, without any cost or expense to Landlord therefor, of
permitting installation in such risers and on such floor(s) of telephone and other communication services and systems (including data cable patch panels) to the Premises at a point designated by
the Landlord.

The Landlord shall have the right to assume control of cables and other telecommunication equipment in the Building and may designate them as part of the common areas.

Section 3.04 Riser Rooms

The parties understand that the Building contains one or more rooms where the fibre optic and telephone equipment for the Building is situated (hereinafter referred to as the "Riser Rooms") and
the  Tenant  agrees  that  all  Riser  Rooms  shall  be  for  the  sole  and  exclusive  use  of  the  Landlord.  The  Tenant  shall  not  use  the  equipment  contained  in  the  Riser  Rooms,  install,  or  instruct  the
installation of any additional equipment, whether telephone equipment, fibre optic equipment or otherwise, without first obtaining the Landlord's written consent to same, which consent may be
unreasonably withheld or granted upon the imposition of any terms which the Landlord deems fit, including the payment of an additional fee, the amount of which shall be established at the sole
discretion of the Landlord.

Section 4.01 Entry for Inspection and Work

ARTICLE IV - ACCESS AND ENTRY

The Landlord shall be entitled at all reasonable times after 24 hours' prior written notice (and at any time without notice in case of emergency) to enter the Premises to examine them; to make
such repairs, alterations or improvements in the Premises or to the Building as the Landlord considers necessary or desirable; to have access to under-floor ducts and access panels to mechanical
shafts; to check, calibrate, adjust and balance controls and other parts of the heating, air conditioning, ventilating and climate control systems; and for any other purpose necessary to enable the
Landlord to perfonn its obligations or exercise its rights under this Lease or in the administration of the Building or other improvements on the Lands. The Tenant shall not obstruct any pipes,
conduits or mechanical or electrical equipment so as to prevent reasonable access thereto. The Landlord shall exercise its rights under this Section, to the extent possible in the circumstances, in
such manner so as to minimize interference with the Tenant's use and enjoyment of the Premises.

Section 4.02 Right to Show Premises

The Landlord and its agents shall have the right to enter the Premises at all reasonable times after 24 hours' prior written notice during Nonnal Business Hours to show them to prospective
purchasers, or Mortgagees or prospective Mortgagees, and, during the last eighteen (18) months of the Term (or the last eighteen (18) months of any extension or renewal term if this Lease is
extended or renewed), to prospective tenants.

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Section 4.03 Entry not Forfeiture

No entry into the Premises or anything done therein by the Landlord pursuant to a right granted by this Lease shall constitute a breach of any covenant for quiet enjoyment, or (except where
expressed by the Landlord in writing) shall constitute a re-entry or forfeiture, or an actual or constructive eviction. The Tenant shall have no claim for injury, damages or loss suffered as a result
of any such entry or thing, except in the case of willful misconduct by the Landlord in the course of such entry, but the Landlord shall in no event be responsible for the acts or negligence of any
Persons providing cleaning or waste disposal services in the Building.

Section 5.01 Maintenance By Landlord

ARTICLE V- MAINTENANCE, REPAIRS AND ALTERATIONS

(a)

(b)

(c)

The  Landlord  covenants  to  keep  the  following  in  good  repair  as  a  prudent  owner:  (i)  the  structure  of  the  Building  including  exterior  walls  and  roofs  (which  obligation  includes
remediating any water penetration into the Premises that is not caused by the Tenant or those the Tenant is responsible at law and that does not originate from the Premises or
from those improvements that are the Tenant's responsibility under Section 5.02 hereof); (ii) the mechanical, electrical, plumbing and other base building systems, (but excluding
components of such systems installed by the Tenant or that service the Tenant's Premises from the point of connection to the base building system); and (iii) the entrance, lobbies, plazas,
stairways, corridors, parking areas and other facilities from time to time provided for use in common by the Tenant and other tenants of the Building. If such maintenance or repairs are
required by law due to the business carried on by the Tenant, then the full cost of such maintenance and repairs plus a sum equal to fifteen percent (15%) of such cost representing the
Landlord's overhead, shall be paid by the Tenant to the Landlord.

The Landlord shall not be responsible for any damages caused to the Tenant by reason of failure of any equipment or facilities serving the Building or delays in the perfonnance of any
work for which h the Landlord is responsible under this Lease. The Landlord shall have the right to stop, interrupt or reduce any services, systems or utilities provided to, or serving the
Building or Premises to perform repairs, alterations or maintenance or to comply with laws or regulations, or requirements of its insurers, or for causes beyond the Landlord's reasonable
control  or  as  a  result  of  the  Landlord  exercising  its  rights  under  Section  3.02.  The  Landlord  shall  not  be  in  breach  of  its  covenant  for  quiet  enjoyment  or  liable  for  any  loss,  costs  or
damages,  whether  direct  or  indirect,  incurred  by  the  Tenant  due  to  any  of  the  foregoing,  but  the  Landlord  shall  make  reasonable  efforts  to  restore  the  services,  utilities  or  systems  so
stopped, interrupted or reduced.

If the Tenant fails to carry out any maintenance, repairs or work required to be carried out by it under this Lease to the reasonable satisfaction of the Landlord, the Landlord may at its
option carry out such maintenance or repairs without any liability for any resulting damage to the Tenant's property or business. The cost of such work, plus a sum equal to fifteen percent
(15%) of such cost representing the Landlord's overhead, shall be paid by the Tenant to the Landlord.

Section 5.02 Maintenance by Tenant; Compliance with Laws

(a)

(b)

(c)

The Tenant shall at its sole cost repair and maintain the Premises exclusive of base building mechanical, electrical and plumbing systems, (but specifically including components of those
systems up to the point of connection to the Landlord's base building system, whether or not such components are within the Premises), all to a standard consistent with a first class office
building, with the exception only of those repairs which are the obligation of the Landlord under this Lease, subject to Article VII . The Landlord may enter the Premises at all reasonable
times upon giving the Tenant at least twenty-four (24) hours' prior notice (except in the case of emergency when no notice is required) to view their condition and the Tenant shall
maintain and keep the Premises in good and substantial repair according to notice in writing. At the expiry or earlier termination of the Term, the Tenant shall surrender the Premises to the
Landlord in as good condition and repair as the Tenant is required to maintain the Premises throughout the Term. The Tenant shall also manage, maintain, operate and repair the Premises
and construct, use, operate and maintain Leasehold Improvements and all furnishings, fixtures and equipment located in the Premises so as to comply with the Environmental Management
Plan.

The Tenant shall, at its own expense, promptly comply with all laws, by-laws, government orders and with all reasonable requirements or directives of the Landlord's insurers affecting the
Premises or their use, repair or alteration.

The Tenant shall not commit, or permit to be committed, waste upon the Premises or Building or the fixtures and equipment thereof or any nuisance or other thing that may disturb the
quiet enjoyment of any other tenant in the Building, whether or not the nuisance arises out of the use of the Premises by the Tenant for a purpose permitted by this Lease.

Section 5.03 Tenant's Alterations

(a)

No  Alterations  shall  be  made  to  the  Premises  without  the  Landlord's  written  approval,  not  to  be  unreasonably  withheld  provided  that  such  Alterations  are  consistent  with  the
Environmental Management Plan and the Tenant Construction Manual. The Tenant shall submit to the Landlord details of the proposed work including four (4) sets of detailed
working drawings and specifications prepared by qualified architects or engineers conforming to good engineering practice. All such Alterations shall be performed: (i) at the sole cost of
the Tenant; (ii) by contractors and workers approved by the Landlord, in advance and having labour union affiliations compatible with those of persons working in the Building on behalf
of the Landlord; (iii) in a good and workmanlike manner and consistent with the Environmental Management Plan and the Tenant Construction Manual; (iv) in accordance with drawings
and specifications approved by the Landlord; (v) in accordance with all applicable legal and insurance requirements; (vi) subject to the reasonable regulations, supervision, control and
inspection of the Landlord; (vii) subject to such indemnification against liens and expenses as the Landlord reasonably requires; and (viii) in accordance with all applicable laws, by-laws,
regulations and government orders. The Landlord's reasonable cost incurred with respect to the Tenant's Alterations including without limitation the cost of approving, supervising and
inspecting all such work shall be paid by the

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Tenant. Following the completion of any such Alterations, the Tenant shall provide the Landlord within five (5) days of request, such post-construction documentation that the Landlord
reasonably requires, which may include, but is not limited to, professionally prepared as-built drawings that accurately reflect the work that was performed.

(b)

(c)

If the Alterations would affect the structure of the Building or any of the electrical, plumbing, mechanical, heating, ventilating or air conditioning systems or other base building systems,
such work shall at the option of the Landlord be performed by the Landlord at the Tenant's cost. If the Landlord performs such work, then on completion of such work, the cost of the
work plus a sum equal to fifteen percent (15%) of said cost representing the Landlord's overhead shall be paid by the Tenant to the Landlord.

If  the  Tenant  installs  Leasehold  Improvements,  or  makes  Alterations  which  depart  from  the  Building  standard  and  which  restrict  access  to  any  Building  system  or  to  any  structural
element of the Building by the Landlord or by any person or corporation authorized by the Landlord, or which restrict the installation of the leasehold improvements of any other tenant in
the  Building,  then  the  Tenant  shall  be  responsible  for  all  costs  incurred  by  the  Landlord  in  obtaining  access  to  such  Building  system,  or  in  installing  such  other  tenant's  leasehold
improvements and the Tenant shall, at the request of the Landlord remove any obstruction in a manner acceptable to the Landlord, failing which the Landlord may remove the same; and
the Tenant will pay, or reimburse the Landlord for, the cost of such removal and for any replacement or restoration of such Leasehold Improvements or Alterations.

Section 5.04 Repair Where Tenant at Fault

Notwithstanding  any  other  provisions  of  this  Lease,  but  subject  to  Section  6.07,  if  the  Building  is  damaged  or  destroyed  or  requires  repair,  replacement  or  alteration  as  a  result  of  the  act  or
omission of the Tenant, its employees, agents, invitees, licensees, contractors or others for whom it is in law responsible, the cost of the resulting repairs, replacements or alterations plus a sum
equal to fifteen percent (15%) of such cost representing the Landlord's overhead, shall be paid by the Tenant to the Landlord.

Section 5.05 Removal of Improvements and Fixtures

All Leasehold Improvements (other than Trade Fixtures) shall immediately upon their placement, before or during the Term, become the Landlord's property without compensation to the Tenant
but the Landlord shall be under no obligation to repair, maintain or insure the same, such matters being the sole responsibility of the Tenant in accordance with the provisions of this Lease. Except
as otherwise agreed by the Landlord in writing, no Leasehold Improvements shall be removed from the Premises by the Tenant either during or at the expiry or sooner termination of the Term
except that:

(a)

(b)

(c)

the Tenant may, during the Term, in the usual course of its business, remove its Trade Fixtures, provided that the Tenant is not in default under this Lease;

the Tenant shall, at the expiry or earlier termination of the Term, at its sole cost, remove its Trade Fixtures from the Premises, failing which, at the option of the Landlord, the Trade
Fixtures shall become the property of the Landlord and may be removed from the Premises and sold or disposed of by the Landlord in such manner as it deems advisable;

the Tenant shall, at the expiry or earlier termination of the Term, at its sole cost, either remove such of the Leasehold Improvements in the Premises as the Landlord shall require to be
removed, and restore the Premises to the condition in which the Tenant took possession of the Premises under the Existing Sublease Consent to the extent required by the Landlord,
acting reasonably, or at the Landlord's option, pay to the Landlord the estimated cost of such removal and restoration as determined by the Architect, acting reasonably. If the Landlord
requires the Tenant to perform the aforesaid work, then:

(i)

(ii)

(iii)

the Tenant shall submit detailed demolition drawings to the Landlord for its prior approval, and such work shall be completed under the supervision of the Landlord;

the Tenant shall, at its expense, repair any damage caused to the Building by such removal; and

if the Tenant fails to complete such work on or before the expiry of the Term, the Tenant shall pay compensation to the Landlord for each day following such expiry until the
completion of such work, at a rate equal to twice the per diem Rent payable during the last month preceding the expiry of the Term, which sum is agreed by the parties to be a
reasonable estimate of the damages suffered by the Landlord for the loss of use of the Premises; and

Notwithstanding Section 5.05(c) above, upon not more than six (6) months prior to the expiry of this Lease, the Tenant may request, which request shall be given in writing to
the Landlord, a list of those Leasehold Improvements that the Landlord will require to be removed from the Premises and the extent to which the Tenant will be required to
restore the Premises or whether the Landlord will require the Tenant to pay the estimated cost for such removal and restoration. In the event that the Landlord fails to respond
within a thirty (30) day period, then the Tenant may request a response from the Landlord, which request shall be given in writing to the Landlord within two (2) days following
the expiry of such thirty (30) day period, and the Landlord shall have a period of fifteen (15) days following receipt of the Tenant's notice to respond; and

(d)

the Tenant shall, at the expiry or earlier termination of the Term, at its sole cost, and at the Landlord's option: (i) remove all wiring, cables, and other telecommunications installations
installed by the Tenant in the risers of the Building or elsewhere in the Building (the "Wiring") or (ii) pay to the Landlord the estimated cost of removal of the Wiring as determined by the
Architect acting reasonably. In the event the Landlord elects that the Tenant shall perform the required work, it shall be completed under the supervision of the Landlord, and the Tenant
shall at its expense, repair any damage caused by such removal.

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Any  removal  by  the  Tenant  of  any  trade  fixtures,  personal  property  and/or  Leasehold  Improvements  as  permitted  by  this  Section  5.05  shall  be  completed  by  or  on  behalf  of  the  Tenant  in
accordance with the Environmental Management Plan and the Tenant Construction Manual.

Section 5.06 Liens

The Tenant shall promptly pay for all materials supplied and work done in respect of the Premises so as to ensure that no lien is registered against any portion of the Lands or Building or against
the Landlord's or Tenant's interest therein. If a lien is registered or filed, the Tenant shall discharge or vacate it at its expense within five (5) business days of notice from the Landlord, failing
which the Landlord may at its option discharge, vacate or otherwise release the lien by paying the amount claimed to be due into court or directly to the lien claimant and the amount so paid and
all expenses of the Landlord including legal fees (on a solicitor and client or substantial indemnity basis) shall be paid by the Tenant to the Landlord. The Tenant will not grant any security
interest in the Leasehold Improvements without the prior written consent of the Landlord and will promptly cause the discharge of any financing statement or notice which may be filed in respect
of such security interest under any statute, unless such statement or notice is in favour of the Landlord.

Section 5.07 Notice by Tenant

The  Tenant  shall  notify  the  Landlord  of  any  accident,  defect,  damage  or  deficiency  in  any  part  of  the  Premises  or  the  Building  which  comes  to  the  attention  of  the  Tenant,  its  employees  or
contractors notwithstanding that the Landlord may have no obligation in respect thereof.

Section 5.08 Not to Overload Floors

The Tenant covenants that it shall not bring upon the Premises any machinery, equipment or thing that by reason of its weight, size or use might damage the Building and shall not at any time
overload the floors of the Premises by any machinery, equipment or thing. If overloading occurs and damage ensues, the Tenant shall forthwith, at the option of the Landlord, repair the damage or
pay the Landlord the cost of making it good, plus a sum equal to fifteen percent (15%) of the total cost thereof for the Landlord's overhead and management, upon demand as Rent. In the event of
any  dispute  as  to  whether  any  machinery,  equipment  or  thing  will  or  will  not  overload  the  floors  of  the  Premises  or  whether  such  machinery,  equipment  or  thing  may  be  brought  upon  the
Premises, the decision of the Architect shall be final and binding.

Section 5.09 Use of Hazardous Substances

The Tenant shall not use the Premises or permit them to be used, to generate, utilize, manufacture, refine, treat, transport, store, handle, transfer, produce or process Hazardous Substances.

Section 5.10 Removal of Hazardous Substances

The Tenant shall, upon expiration or termination of this Lease or any renewal thereof, promptly remove all Hazardous Substances used or brought onto the Premises by the Tenant or those acting
under its authority or control. For greater certainty, the foregoing obligation of the Tenant shall include, without limitation, the responsibility to remove any Hazardous Substances which have as a
result of the operations of the Tenant, or any other person acting under its authority or control, become affixed to, permeated within or accumulated on or within the Building.

Section 6.01 Tenant's Insurance

(a)

The Tenant shall maintain the following insurance throughout the Term at its sole cost:

ARTICLE VI -INSURANCE AND INDEMNITY

(i)

(ii)

"All Risks" (including flood and earthquake) property insurance with reasonable deductibles, naming the Landlord, the owners of the Lands and Building and the Mortgagee as
insured parties, as their interests may appear, containing a waiver of any subrogation rights which the Tenant's insurers may have against the Landlord and against those for whom
the  Landlord  is  in  law  responsible,  and  (except  with  respect  to  the  Tenant's  chattels)  incorporating  the  Mortgagee's  standard  mortgage  clause.  Such  insurance  shall  insure:  (1)
property of every kind owned by the Tenant or for which the Tenant is legally liable located on or in the Building including, without limitation, Leasehold Improvements, in an
amount equal to not less than the full replacement cost thereof, subject to a stated amount co-insurance clause; and (2) extra expense insurance in such amount as will reimburse the
Tenant for loss attributable to all perils referred to in this paragraph 6.01 (a)(i) or resulting from prevention of access to the Premises;

Commercial general liability insurance which includes the following coverages: owners and contractors protective; personal injury; occurrence property damage; and employers
and  blanket  contractual  liability.  Such  policies  shall  contain  inclusive  limits  of  not  less  than  five  million  dollars  ($5,000,000.00),  provide  for  cross  liability  and  severability  of
interests, and include the Landlord and its property manager as a named insured;

(iii)

Tenant's "all risks" legal liability insurance for the replacement cost value of the Premises;

(iv)

(v)

Automobile liability insurance on a non-owned form including contractual liability, and on an owner's form covering all licensed vehicles operated by or on behalf of the Tenant,
which insurance shall have inclusive limits of not less than one million dollars ($1 ,000,000.00); and

Any other form of insurance which the Tenant or the Landlord, acting reasonably, or the Mortgagee requires from time to time in form, in amounts and for risks against which a
prudent tenant would insure.

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(b)

All policies referred to in this Section 6.01 shall:

(i)

(ii)

be taken out with insurers reasonably acceptable to the Landlord;

be in a form reasonably satisfactory to the Landlord :

(iii)

be non-contributing with, and shall apply only as primary and not as excess to any other insurance available to the Landlord;

(iv)

not be invalidated as respects the interests of the Landlord or the Mortgagee by reason of any breach of or violation of any warranty, representation, declaration or condition; and

(v)

contain  an  undertaking  by  the  insurers  to  notify  the  Landlord  by  registered  mail  not  less  than  thirty  (30)  days  prior  to  any  material  change,  cancellation  or  termination.  If not
available, the Tenant undertakes and agrees to notify the Landlord as described.

(c)

Certificates  of  insurance  on  the  Landlord's  standard  form  or  other  proof  of  insurance  as  reasonably  required  by  the  Landlord,  shall  be  delivered  to  the  Landlord  prior  to  the
Commencement Date and from time to time, forthwith upon request. If the Tenant fails to take out or to keep in force any insurance referred to in this Section 6.01 or should any such
insurance not be approved by either the Landlord or the Mortgagee and should the Tenant not commence to diligently rectify (and thereafter proceed to diligently rectify) the situation
within forty-eight (46) hours after written notice by the Landlord to the Tenant (stating, if the Landlord or the Mortgagee, from time to time, does not approve of such insurance, the
reasons therefor) the Landlord has the right without assuming any obligation in connection therewith, to effect such insurance at the sole cost of the Tenant and all outlays by the Landlord
shall be paid by the Tenant to the Landlord without prejudice to any other rights or remedies of the Landlord under this Lease.

(d)

The Tenant will cooperate with the Landlord and each of the other entities that is added as an insured or loss payee under the policies maintained by the Tenant as required by this Lease,
to ensure that each of them obtains the full benefit of the coverage and provisions of those policies intended to benefit them.

Section 6.02 Increase in Insurance Premiums

The Tenant shall not keep or use in the Premises any article which may be prohibited by any fire insurance policy in force from time to time covering the Premises or the Building. If: (a) the
conduct of business in, or use or manner of use of the Premises; or (b) any acts or omissions of the Tenant in the Building or any part thereof: causes or results in any increase in premiums for
any insurance carried by the Landlord with respect to the Building, the Tenant shall pay any such increase in premiums. In determining whether increased premiums are caused by or result from
the  use  or  occupancy  of  the  Premises,  a  schedule  issued  by  the  organization  computing  the  insurance  rate  on  the  Building  showing  the  various  components  of  such  rate,  shall  be  conclusive
evidence of the items and charges which make up such rate.

Section 6.03 Cancellation of Insurance

If any insurer under any insurance policy covering any part of the Building or any occupant thereof cancels or threatens to cancel its insurance policy or reduces or threatens to reduce coverage
under such policy by reason of the use of the Premises by the Tenant or by any Transferee, or by anyone permitted by the Tenant to be upon the Premises, the Tenant shall remedy such condition
within forty-eight (46) hours after notice thereof by the Landlord.

Section 6.04 Loss or Damage

The Released Persons shall not be liable for any death or injury arising from or out of any occurrence in, upon, at, or relating to the Lands or Building or damage to property of the Tenant or of
others located on the Premises or elsewhere in the Building, nor shall they be responsible for any loss of or damage to any property of the Tenant or others from any cause, whether or not any
such death, injury, loss or damage results from the negligence of the Released Persons, their agents, employees, contractors, or others for whom they may, in law, be responsible. Without limiting
the generality of the foregoing, the Released Persons shall not be liable for any injury or damage to Persons or property resulting from interruption of utilities or services including but not limited
to telecommunications services, or resulting from fire, explosion, falling plaster, falling ceiling tile, falling fixtures, steam, gas, electricity, water, rain, flood, snow or leaks from any part of the
Premises or from the pipes, sprinklers, appliances, plumbing works, roof, windows or subsurface of any floor or ceiling of the Building or from the street or any other place or by dampness or by
any other cause whatsoever. The Released Persons shall not be liable for any such damage caused by other tenants or Persons on the Lands or in the Building or by occupants of adjacent property
thereto, or the public, or caused by construction or by any private, public or quasi-public work. All property of the Tenant kept or stored on the Premises shall be so kept or stored at the risk of the
Tenant only and the Tenant releases and agrees to indemnify the Released Persons and save them harmless from any claims arising out of any damage to the same including, without limitation,
any subrogation claims by the Tenant's insurers. Notwithstanding anything contained in this Section 6.04 to the contrary, it is understood and agreed that the Landlord is liable for any
such  death  or  injury  or  any  such  damage  to  property  referred  to  in  this  Section  6.04  if  any  such  death  or  injury  or  any  such  damage  to  property  is  caused  by  or  to  the  extent
contributed to by the negligence of the Landlord, but only to the extent that:

(a)

(i) the Tenant is not required to have insurance coverage pursuant to Section 6.01 of this Lease, and (ii) the Tenant does not otherwise have insurance coverage for such
death or injury or any such damage to property, in either case without taking into account any deductible or co-insurance provisions or other clauses; and

(b)

the Landlord is indemnified by its insurers for any such death or injury or any such damage to property.

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Section 6.05 Landlord's Insurance

The Landlord shall throughout the Term carry: (a) insurance on the Building (excluding the foundations and excavations) and the machinery, boilers and equipment in or servicing the Building
and  owned  by  the  Landlord  or  the  owners  of  the  Building  (excluding  any  property  which  the  Tenant  and  other  tenants  are  obliged  to  insure  under  Section  6.01  or  similar  sections  of  their
respective leases) against damage by fire and extended perils coverage; (b) public liability and property damage insurance with respect to the Landlord's operations in the Building; and (c) such
other form or forms of insurance as the Landlord or the Mortgagee reasonably considers advisable. Such insurance shall be in such reasonable amounts and with such reasonable deductibles as
would be carried by a prudent owner of a reasonably similar building, having regard to size, age and location. Notwithstanding the Landlord's covenant in this Section and notwithstanding any
contribution by the Tenant to the cost of the Landlord's insurance premiums, the Tenant acknowledges and agrees that: (i) subject to Section 6.07, the Tenant is not relieved of any liability arising
from or contributed to by its negligence or its willful act or omissions; (ii) no insurable interest is conferred upon the Tenant under any insurance policies carried by the Landlord; and (iii) the
Tenant has no right to receive any proceeds of any insurance policies carried by the Landlord.

Section 6.06 Indemnification By the Tenant

Notwithstanding  any  other  provision  of  this  Lease  and  notwithstanding  any  negligence  on  the  part  of  the  Released  Persons,  the  Tenant  shall  indemnify  the  Released  Persons  and  save  them
harmless from all loss (including loss of Net Rent and Additional Rent) claims, actions, damages, liability and expense in connection with loss of life, personal injury, damage to property or any
other loss or injury whatsoever arising out of this Lease, or any occurrence in, upon or at the Premises, or the occupancy or use by the Tenant of the Premises or any part thereof, or occasioned
wholly or in part by any act or omission of the Tenant or by anyone permitted to be on the Premises by the Tenant except to the extent that the Landlord is liable for such death, injury, loss
or damage under Section 6.04. If the Released Persons shall, without fault on their part, be made a party to any litigation commenced by or against the Tenant, then the Tenant shall protect,
indemnify and hold the Released Persons harmless in connection with such litigation. The Released Persons may, at their option, participate in or assume carriage of any litigation or settlement
discussions relating to the foregoing, or any other matter for which the Tenant is required to indemnify the Released Persons under this Lease. Alternatively, the Released Persons may require the
Tenant to assume carriage of and responsibility for all or any part of such litigation or discussions.

Section 6.07 Release By the Landlord

Despite any other section or clause of this Lease (except the last sentence of this Section 6.07), the Tenant is not responsible for any part, in excess of five million dollars ($5,000,000.00), or the
amount of liability insurance coverage available to the Tenant, whichever is the greater, of any loss or damage to property of the Landlord that is located in, or is part of the Building and Lands
caused by any of the perils for which the Landlord is required under Section 6.05 to maintain insurance. This release applies whether or not the loss or damage arises from the negligence of the
Tenant. This release does not apply, however, to damage arising from the willful or grossly negligent acts of the Tenant.

ARTICLE VII - DAMAGE AND DESTRUCTION

Section 7.01 No Abatement or Termination

If the Premises or Building are damaged or destroyed in whole or in part by fire or any other occurrence, this Lease shall continue in full force and effect and there shall be no abatement of Rent
except as provided in this Article VII.

Section 7.02 Damage to Premises

If the Premises are at any time destroyed or damaged as a result of fire or any other casualty required to be insured against by the Landlord under this Lease or otherwise insured against by the
Landlord and not caused or contributed to by the Tenant, then the following provisions shall apply:

(a)

(b)

(c)

(d)

if the Premises are rendered untenantable only in part, the Landlord shall diligently repair the Premises to the extent only of its obligations under Section 5.01 and Net Rent shall abate
proportionately to the portion of the Premises rendered untenantable from the date of destruction or damage until the Landlord's repairs have been completed;

if the Premises are rendered wholly untenantable, the Landlord shall diligently repair the Premises to the extent only of its obligations pursuant to Section 5.01 and Net Rent shall abate
entirely from the date of destruction or damage until the Landlord's repairs have been completed;

if the Premises are not rendered untenantable in whole or in part, the Landlord shall diligently perform such repairs to the Premises to the extent only of its obligations under Section 5.01,
but in such circumstances Net Rent shall not terminate or abate;

upon being notified by the Landlord that the Landlord's repairs have been substantially completed, the Tenant shall diligently perform all repairs to the Premises which are the Tenant's
responsibility under Section 5.02, and all other work required to fully restore the Premises for use in the Tenant's business, in every case at the Tenant's cost and without any contribution
to such cost by the Landlord, whether or not the Landlord has at any time made any contribution to the cost of supply, installation or construction of Leasehold Improvements in the
Premises;

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 (e)

 (f)

nothing in this Section shall require the Landlord to rebuild the Premises in the condition which existed before any such damage or destruction so long as the Premises as rebuilt will have
reasonably similar facilities to those in the Premises prior to such damage or destruction, having regard, however, to the age of the Building at such time; and

nothing in this Section shall require the Landlord to undertake any repairs having a cost in excess of the insurance proceeds actually received by the Landlord with respect to such damage
or destruction.

Section 7.03 Right of Termination

Notwithstanding Section 7.02, if the damage or destruction which has occurred in the Premises is such that in the reasonable opinion of the Landlord the Premises cannot be rebuilt or made fit for
the purposes of the Tenant within ninety (90) days of the happening of the damage or destruction, the Landlord may, at its option, terminate this Lease on notice to the Tenant given within thirty
(30) days after such damage or destruction. If such notice of termination is given, Rent shall be apportioned and paid to the date of such damage or destruction and the Tenant shall immediately
deliver vacant possession of the Premises in accordance with the terms of this Lease.

Section 7.04 Destruction of or Damage to Building

(a)

Notwithstanding anything contained in this Lease and specifically notwithstanding the provisions of Section 7.03, if

(i)

(ii)

thirty-five percent (35%) or more of the Total Rentable Area of the Building; or

a portion of the Building or Lands which materially affect access or services essential thereto;

are damaged or destroyed by any cause whatsoever (irrespective of whether the Premises are damaged or destroyed) and if, in the opinion of the Landlord acting reasonably, the Building
cannot be rebuilt or made fit for the purposes of their respective tenants within one hundred and eighty (180) days after the occurrence of the damage or destruction; then the Landlord may
at its option (to be exercised by written notice to the Tenant within sixty (60) days following any such occurrence), terminate this Lease. In such event, the Term and the tenancy hereby
created shall expire upon the thirtieth (30th) day after such notice is given, without indemnity or penalty payable by, or any other recourse against the Released Persons, and the Tenant
shall, within such thirty (30) day period, vacate the Premises and surrender them to the Landlord with the Landlord having the right to re-enter and repossess the Premises discharged of
this Lease and to expel all Persons and remove all property therefrom. Rent shall be due and payable without reduction or abatement until the date of termination, unless the Premises shall
have been destroyed or damaged as well, in which event Section 7.02 shall apply.

(b)

If the Landlord is entitled to, but does not elect to terminate this Lease under Section 7.04(a), the Landlord shall, following such damage or destruction, diligently repair if necessary that
part of the Building damaged or destroyed, but only to the extent of the Landlord's obligations under the terms of the various leases for premises in the Building and exclusive of any
tenant's responsibilities with respect to such repair. If the Landlord elects to repair, the Landlord may do so in accordance with plans and specifications other than those used in the original
construction of the Building.

Section 7.05 Architect's Certificate

The certificate of the Architect shall bind the parties as to: (a) the percentage of the Total Rentable Area of the Building damaged or destroyed; (b) whether or not the Premises are rendered
untenantable and the percentage of the Premises rendered untenantable; (c) the date upon which either the Landlord's or Tenant's work of reconstruction or repair is completed or substantially
completed and the date when the Premises are rendered tenantable; and (d) the state of completion of any work of the Landlord or the Tenant.

ARTICLE VIII -ASSIGNMENT, SUBLETTING AND TRANSFERS

Section 8.01 Assignments, Subleases and Transfers

Save and except as permitted in Section 8.01A, the Tenant shall not enter into, consent to, or permit (whether voluntarily, involuntarily or by operation of law) any Transfer without the prior
written consent of the Landlord in each instance, which consent shall not be unreasonably withheld but shall be subject to the Landlord's rights under Section 8.02. Notwithstanding any statutory
provision to the contrary, it shall not be considered unreasonable for the Landlord to take into account the following factors in deciding whether to grant or withhold its consent:

(a)

(b)

(c)

(d)

(e)

whether such Transfer is in violation or in breach of any covenants or restrictions made or granted by the Landlord to other tenants or occupants or prospective tenants or occupants of the
Building;

whether in the Landlord's reasonable opinion, the financial background, business history and capability of the proposed Transferee is satisfactory;

whether the nature of the business of the proposed Transferee might harm the Landlord's business or reputation or reflect unfavourably on the Building or its tenants, or is unethical or
illegal;

if the Transfer is to an existing tenant of the Landlord;

the proposed assignee or sublessee is a governmental department, agency or consulate;

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(f)

(g)

(h)

(i)

(j)

in  the  Landlord's  reasonable  judgment,  the  use  of  the  Premises  by  the  proposed  assignee  or  sublessee  would  involve  occupancy  by  other  than  primarily  general  office  personnel  or
otherwise in violation of Section 1.05 of this Lease, would involve any alterations which would lessen the value of the leasehold improvements in the Premises, would require increased
services, including increased load on elevator services, by the Landlord or alter the reputation or character of the Building;

in the Landlord's reasonable judgment, the proposed assignee or sublessee does not have a good reputation in the community as a tenant of property;

the use of the Premises by the proposed assignee or subtenant will violate any applicable law, by-law or regulation;

there has occurred and is continuing an Event of Default by the Tenant under this Lease;

in the case of a subletting of less than the entire Premises, if the subletting would result in the division of any one floor of the Premises into more than three subspaces or would require
access to be provided through space leased or held for lease to another tenant or improvements to be made outside of the Premises; or

(k)

the Landlord does not receive sufficient information from the Tenant of the proposed assignee or subtenant to enable it to make a determination concerning the matters herein set out.

Consent by the Landlord to any Transfer if granted shall not constitute a waiver of the necessity for such consent to any subsequent Transfer. This prohibition against Transfer shall include a
prohibition against any Transfer by operation of law and no Transfer shall take place by reason of the failure of the Landlord to give notice to the Tenant within thirty (30) days as required by
Section 8.02. Notwithstanding anything to the contrary herein contained, the Tenant may not assign this Lease while any Rent is in arrears hereunder or while any other Event of Default exists
hereunder. Before making any assignment of this Lease the Tenant will pay all Rent in arrears and will remedy any Event of Default which then exists or will cause any Event of Default to cease
to exist.

Section 8.01 A Transfer to a Permitted Transferee

Notwithstanding anything contained to the contrary in Section 8.01, and so long as the Required Conditions apply, the Tenant shall not require the consent of the Landlord (but in
each case shall provide the Landlord with prior written notice) in the case of any Transfer to an entity which is:

(a)

(b)

an Affiliate (within the meaning of the Canada Business Corporations Act) of Sierra Oncology Canada ULC, but only so long as such Affiliate remains an Affiliate of Sierra
Oncology Canada ULC; or

a  corporation  or  other  legal  entity  which  is  a  successor  of  the  Tenant  by  way  of  a  merge,  amalgamation,  consolidation  or  other  form  of  re-organization  with  an  Affiliate  of
Oncology Canada ULC, whether voluntary or involuntary, by operation of law or otherwise;

(collectively, a "Permitted Transferee"),

provided that in either case (1) such Permitted Transferee shall carry on only the same business as is permitted to be carried on by the Tenant pursuant to Section 1.05; (2) the Tenant
shall cause such Permitted Transferee to enter into an agreement prepared by and in a form satisfactory to the Landlord in which such Permitted Transferee covenants directly with
the Landlord to be bound by all the terms, covenants and conditions contained in this Lease as if such Permitted Transferee had originally executed the Lease as Tenant; and (3) all the
provisions of Section 8.03 shall apply in respect of such Transfer.

In no event will any Transfer permitted pursuant to this Section 8.01A relieve the Tenant from the performance of the terms, covenants and conditions herein on its part contained to
be observed and performed. In the event of any further proposed Transfer, the terms of this Lease shall prevail as if this Section 8.01A had not formed part of this Lease.

Section 8.02 Landlord's Rights

If the Tenant intends to effect a Transfer, the Tenant shall give prior notice to the Landlord of such intent specifying the identity of the Transferee, the type of Transfer contemplated, the portion of
the  Premises  affected  thereby,  and  the  financial  and  other  terms  of  the  Transfer,  and  shall  provide  such  financial,  business  or  other  information  relating  to  the  proposed  Transferee  and  its
principals as the Landlord or any Mortgagee requires, together with copies of any documents which record the particulars of the proposed Transfer. The Landlord shall, within thirty (30) days
after having received such notice and all requested information, notify the Tenant either that:

(a)

(b)

it consents or does not consent to the Transfer in accordance with the provisions and qualifications of this Article VIII; or

it elects to terminate this Lease as to the whole or part, as the case may be, of the Premises affected by the proposed Transfer, in preference to giving such consent.

If the Landlord elects to terminate this Lease it shall stipulate in its notice the termination date of this Lease, which date shall be no less than thirty (30) days nor more than ninety (90) days
following the giving of such notice of termination. If the Landlord elects to terminate this Lease, the Tenant shall notify the Landlord within ten (10) days thereafter of the Tenant's intention either
to refrain from such Transfer or to accept termination of this Lease or the portion thereof in respect of which the Landlord has exercised its rights. If the Tenant fails to deliver such notice within
such ten (10) days or notifies the Landlord that it accepts the Landlord's termination, this Lease will as to the whole or affected part of the Premises, as the case may be, be terminated on the date
of termination stipulated by the Landlord in its notice of termination. If the Tenant

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notifies the Landlord within ten (10) days that it intends to refrain from such Transfer, then the Landlord's election to terminate this Lease shall become void. If the Landlord does not elect to
terminate this Lease then Section 8.01 and 8.03 shall continue to apply to such Transfer. For greater certainty, the foregoing does not apply to a Transfer to a Permitted Transferee.

Section 8.03 Conditions of Transfer

The following terms and conditions apply in respect of a Transfer:

(a)

(b)

(c)

(d)

(e)

(f)

(g)

If  there  is  a  permitted  Transfer,  the  Landlord  may  collect  rent  from  the  Transferee  and  apply  the  net  amount  collected  to  the  Rent  payable  under  this  Lease  but  no  acceptance  by  the
Landlord of any payments by a Transferee shall be deemed a waiver of the Tenant's covenants or any acceptance of the Transferee as tenant or a release of the Tenant from the further
performance  by  the  Tenant  of  its  obligations  under  this  Lease.  Any  consent  by  the  Landlord  shall  be  subject  to  the  Tenant  and  Transferee  executing  an  agreement  with  the  Landlord
agreeing: (i) that the Transferee will be bound by all of the terms of this Lease and, except in the case of a sublease, that the Transferee will be so bound as if it had originally executed this
Lease as tenant; and (ii) to amend the Lease to incorporate such terms, covenants and conditions as are necessary so that the Lease will be in accordance with the Landlord's standard form
of office lease in use for the Building at the time of the Transfer, and so as to incorporate any conditions imposed by the Landlord in its consent or required by this Section 8.03.

The Tenant shall remain liable under this Lease and shall not be released from performing or observing any of the terms or conditions of this Lease.

The  rent  and  additional  rent  payable  by  the  Transferee  shall  not  be  less  than  the  Net  Rent  and  Additional  Rent  payable  by  the  Tenant  under  this  Lease  as  at  the  effective  date  of  the
Transfer, (including any increases provided for in this Lease).

If the net and additional rent to be paid by the Transferee under such Transfer exceeds the Rent payable under this Lease, the amount of such excess shall be paid by the Tenant to the
Landlord. If the Tenant receives from any Transferee, either directly or indirectly, any consideration other than rent or additional rent for such Transfer, either in the form of cash, goods or
services (other than the proceeds of any financing as the result of a Transfer involving a mortgage, charge or similar security interest in this Lease) the Tenant shall forthwith pay to the
Landlord an amount equivalent to such consideration. The Tenant and the Transferee shall execute any agreement required by the Landlord to give effect to the foregoing terms.

If the Transfer is a sublease, the Transferee will agree to waive any statutory right to retain the unexpired portion of the term of the sublease or the Term of this Lease or to enter into a
lease directly with the Landlord, in the event this Lease is terminated, surrendered, disclaimed or otherwise disposed of or dealt with.

Notwithstanding the effective date of any permitted Transfer as between the Tenant and the Transferee, all Rent for the month in which such effective date occurs shall be paid in advance
by the Tenant so that the Landlord will not be required to accept partial payments of Rent for such month from either the Tenant or Transferee.

Any document evidencing any Transfer permitted by the Landlord, or setting out any terms applicable to such Transfer or the rights and obligations of the Tenant or Transferee thereunder,
shall be prepared by the Landlord or its solicitors and all associated legal costs shall be paid by the Tenant.

Section 8.04 Change of Control

If the Tenant is at any time a corporation or partnership, any actual or proposed Change of Control in such corporation or partnership shall be deemed to be a Transfer and subject to all of the
provisions of this Article VIII. The Tenant shall make available to the Landlord or its representatives all of its corporate or partnership records, as the case may be, for inspection at all reasonable
times, in order to ascertain whether any Change of Control has occurred. Notwithstanding the foregoing, so long as the Required Conditions are satisfied, the foregoing requirement that
the Tenant make available to the Landlord or its representatives all of its corporate or partnership records shall be suspended provided that, upon the request of the Landlord, the
Tenant will provide a certificate executed by the President of the Tenant, certifying whether or not a Change of Control has occurred and, if so, the particulars of such Change of
Control.

Section 8.05 No Advertising

The Tenant shall not advertise that the whole or any part of the Premises are available for a Transfer and shall not permit any broker or other Person to do so unless the text and format of such
advertisement and the publications in which such advertisement is to be placed are approved in writing by the Landlord. No such advertisement shall contain any reference to the rental rate of the
Premises.

Section 8.06 Assignment By Landlord

The Landlord shall have the unrestricted right to sell, lease, convey or otherwise dispose of all or any part of the Building or Lands or this Lease or any interest of the Landlord in this Lease. To
the extent that the purchaser or assignee from the Landlord assumes the obligations of the Landlord under this Lease, the Landlord shall thereupon and without further agreement be released from
all liability under this Lease.

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Section 9.01 Default and Remedies

ARTICLE IX- DEFAULT

If and whenever an Event of Default occurs, then without prejudice to any other rights which it has pursuant to this Lease or at law, the Landlord shall have the following rights and remedies,
which are cumulative and not alternative:

(a)

(b)

(c)

(d)

(e)

(f)

terminate this Lease by notice to the Tenant, whether or not the Landlord has, with respect to the same or another Event of Default, previously elected or pursued a right or remedy which
is inconsistent with termination of this Lease;

to enter the Premises as agent of the Tenant and to relet the Premises for whatever term, and on such terms as the Landlord in its discretion may determine and to receive the rent therefor
and as agent of the Tenant to take possession of any property of the Tenant on the Premises, to store such property at the expense and risk of the Tenant or to sell or otherwise dispose of
such property in such manner as the Landlord may see fit without notice to the Tenant; to make alterations to the Premises to facilitate their reletting; and to apply the proceeds of any such
sale or reletting first, to the payment of any expenses incurred by the Landlord with respect to any such reletting or sale; second, to the payment of any indebtedness of the Tenant to the
Landlord other than Rent; and third, to the payment of Rent in arrears; with the residue to be held by the Landlord and applied in payment of future Rent as it becomes due and payable.
The Tenant shall remain liable for any deficiency to the Landlord. If any reletting extends for a period beyond the end of the Term, such reletting shall not constitute a termination of this
Lease, but a reletting as agent of the Tenant up to the end of the Term and a letting thereafter by the Landlord for its own account;

to remedy or attempt to remedy any default of the Tenant under this Lease for the account of the Tenant and to enter upon the Premises for such purposes. No notice of the Landlord's
intention to perform such covenants need be given the Tenant unless expressly required by this Lease. The Landlord shall not be liable to the Tenant for any loss, injury or damage caused
by acts of the Landlord in remedying or attempting to remedy such default and the Tenant shall pay to the Landlord all expenses incurred by the Landlord in connection with remedying or
attempting to remedy such default;

to recover from the Tenant all damages, and expenses incurred by the Landlord as a result of any breach by the Tenant including, if the Landlord terminates this Lease, any deficiency
between those amounts which would have been payable by the Tenant for the portion of the Term following such termination and the net amounts actually received by the Landlord during
such period of time with respect to the Premises;

to recover from the Tenant the full amount of the current month's Rent together with the next three (3) months' installments of Rent, all of which shall accrue on a day-to-day basis and
shall immediately become due and payable as accelerated rent; and

if the Lease has been terminated in accordance with Section 9.01 (a), to recover from the Tenant the unamortized portion of any leasehold improvement allowance or inducement paid or
given by the Landlord under the terms of this Lease, calculated from the date which is the later of the date of payment by the Landlord or the Commencement Date, on the basis of an
assumed rate of depreciation on a straight line basis to zero over the initial Term of this Lease.

Section 9.02 Distress

Notwithstanding any provision of this Lease or any provision of applicable legislation, none of the goods and chattels of the Tenant on the Premises at any time during the Term shall be exempt
from  levy  by  distress  for  Rent  in  arrears,  and  the  Tenant  waives  any  such  exemption.  If  the  Landlord  makes  any  claim  against  the  goods  and  chattels  of  the  Tenant  by  way  of  distress,  this
provision may be pleaded as an estoppel against the Tenant in any action brought to test the right of the Landlord to levy such distress. The Tenant acknowledges and agrees that the Landlord is
entitled to levy by distress any accelerated rent which becomes due and is payable pursuant to Section 9.01 (e) of this Lease.

Section 9.03 Damages and Costs

The  Tenant  shall  pay  to  the  Landlord  all  damages  and  costs  (including,  without  limitation,  all  legal  fees  on  a  solicitor  and  client  or  substantial  indemnity  basis)  incurred  by  the  Landlord  in
enforcing the terms of this Lease, or with respect to any matter or thing which is the obligation of the Tenant under this Lease, or in respect of which the Tenant has agreed to insure, or to
indemnify the Landlord.

Section 9.04 Allocation of Payments

The Landlord may at its option apply sums received from the Tenant against any amounts due and payable by the Tenant under this Lease in such manner as the Landlord sees fit.

Section 9.05 Survival of Obligations

If the Tenant has failed to fulfill its obligations under this Lease with respect to the payment of Rent, the maintenance, repair and alteration of the Premises and removal of improvements and
fixtures from the Premises during or at the end of the Term, such obligations and the Landlord's rights in respect thereto shall remain in full force and effect notwithstanding the expiry, surrender
or sooner termination of the Term.

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Section 10.01 Status Statement

ARTICLE X- STATUS STATEMENT, ATTORNMENT AND SUBORDINATION

Within ten (10) days after written request by the Landlord, the Tenant shall deliver in a form supplied by the Landlord a statement or estoppel certificate to the Landlord as to the status of this
Lease, including as to whether this Lease is unmodified and in full force and effect (or, if there have been modifications that this Lease is in full force and effect as modified and identifying the
modification agreements); the amount of Net Rent and Additional Rent then being paid and the dates to which same have been paid; whether or not there is any existing or alleged default by
either party with respect to which a notice of default has been served and if there is any such default, specifying the nature and extent thereof; and any other matters pertaining to this Lease as to
which the Landlord shall request such statement or certificate.

Section 10.02 Subordination

This Lease and all rights of the Tenant shall be subject and subordinate to any and all Mortgages and any ground, operating, overriding, underlying or similar leases from time to time in existence
against the Lands and Building. On request, the Tenant shall acknowledge in writing the subordination of this Lease and its rights under this Lease to any and all such Mortgages and leases and to
all advances made under such Mortgages. The form of such subordination shall be as required by the Landlord or any Mortgagee or the lessor under any such lease.

Section 10.03 Attornment

The Tenant shall promptly, on request, attorn to any Mortgagee, or to the owners of the Building and Lands, or the lessor under any ground, operating, overriding, underlying or similar lease of
all or substantially all of the Building made by the Landlord or otherwise affecting the Building and Lands, or the purchaser on any foreclosure or sale proceedings taken under any Mortgage, and
shall recognize such Mortgagee, owner, lessor or purchaser as the Landlord under this Lease.

Section 10.04 Execution of Documents

The Tenant irrevocably constitutes the Landlord the agent and attorney of the Tenant for the purpose of executing any agreement, certificate, attornment or subordination required by this Lease
and for registering postponements in favour of any Mortgagee if the Tenant fails to execute such documents within ten (10) days after request by the Landlord.

Section 11.01 Rules and Regulations

ARTICLE XI - GENERAL PROVISIONS

The Tenant shall comply with all Rules and Regulations, and amendments thereto, adopted by the Landlord from time to time including those set out in Schedule "D". Such Rules and Regulations
may differentiate between different types of businesses in the Building, and the Landlord shall have no obligation to enforce any Rule or Regulation or the provisions of any other lease against
any other tenant, and the Landlord shall have no liability to the Tenant with respect thereto.

Section 11.02 Delay

Except as expressly provided in this Lease, whenever the Landlord or Tenant is delayed in the fulfillment of any obligation under this Lease (other than the payment of Rent and surrender of the
Premises  on  termination)  by  an  unavoidable  occurrence  which  is  beyond  the  reasonable  control  (except  a  delay  caused  by  lack  of  funds  or  other  financial  reason)  of  the  party  delayed  in
performing such obligation, then the time for fulfillment of such obligation shall be extended during the period in which such circumstances operate to delay the fulfillment of such obligation.

Section 11.03 Overholding

If the Tenant remains in possession of the Premises after the end of the Term with the consent of the Landlord but without having executed and delivered a new lease or an agreement extending
the Term, there shall be no tacit renewal of this Lease and the Tenant shall be deemed to be occupying the Premises as a Tenant from month to month at a monthly Net Rent payable in advance on
the first day of each month equal to 150% of the monthly amount of Net Rent payable during the last month of the Term, and otherwise upon the same terms as are set forth in this Lease, so far
as these are applicable to a monthly tenancy.

Section 11.04 Waiver

If either the Landlord or Tenant excuses or condones any default by the other of any obligation under this Lease, no waiver of such obligation shall be implied in respect of any continuing or
subsequent default.

Section 11.05 Registration

The Tenant may register, at the Tenant's sole costs, a notice of lease or short form of lease in a form first approved by the Landlord, which approval shall not be unreasonably withheld
or delayed. The Tenant consents and agrees that no financial terms of this Lease shall be disclosed in such notice of lease or short form of lease. If the Lands comprise more than one
parcel of land, the Landlord may direct the Tenant or Transferee as to the parcel or parcels against which registration may be effected.

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Section 11.06 Notices

Any notice, consent or other instrument which may be or is required to be given under this Lease shall be in writing and shall be delivered in person or sent by registered mail postage prepaid,
addressed: (a) if to the Landlord: c/o The Cadillac Fairview Corporation Limited, 20 Queen Street West, 5th Floor, Toronto, Ontario, M5H 3R4, Attention: Executive Vice President, Property
Management, with a copy to the Building Manager; and (b) if to the Tenant, at the Premises, or, at the Landlord's option, to the Tenant at the address set out in Section 1.01(j). Any such notice or
other instrument shall be deemed to have been given and received on the day upon which personal delivery is made or, if mailed, then forty-eight (48) hours following the date of mailing. Either
party may give notice to the other of any change of address and after the giving of such notice, the address therein specified is deemed to be the address of such party for the giving of notices. If
postal service is interrupted or substantially delayed, all notices or other instruments shall be delivered in person.

Section 11.07 Successors

The rights and liabilities created by this Lease extend to and bind the successors and assigns of the Landlord and the heirs, executors, administrators and permitted successors and assigns of the
Tenant. No rights, however, shall enure to the benefit of any Transferee unless the provisions of Article VIII are complied with.

Section 11.08 Joint and Several Liability

If there is at any time more than one Tenant or more than one Person constituting the Tenant, their covenants shall be considered to be joint and several and shall apply to each and every one of
them. If the Tenant is or becomes a partnership, each Person who is a member, or shall become a member, of such partnership or its successors shall be and continue to be jointly and severally
liable for the performance of all covenants of the Tenant pursuant to this Lease, whether or not such Person ceases to be a member of such partnership or its successor.

Section 11.09 Captions and Section Numbers

The captions, section numbers, article numbers and table of contents appearing in this Lease are inserted only as a matter of convenience and in no way affect the substance of this Lease.

Section 11.10 Extended Meanings

The words "hereof', "hereto" and "hereunder" and similar expressions used in this Lease relate to the whole of this Lease and not only to the provisions in which such expressions appear. This
Lease shall be read with all changes in number and gender as may be appropriate or required by the context.

Section 11.11 Partial Invalidity

All of the provisions of this Lease are to be construed as covenants even though not expressed as such. If any such provision is held or rendered illegal or unenforceable it shall be considered
separate  and  severable  from  this  Lease  and  the  remaining  provisions  of  this  Lease  shall  remain  in  force  and  bind  the  parties  as  though  the  illegal  or  unenforceable  provision  had  never  been
included in this Lease.

Section 11.12 Entire Agreement

This Lease and the Schedules and riders, if any, attached hereto and the Tenant Construction Manual, set forth the entire agreement between the Landlord and Tenant concerning the Premises and
there  are  no  agreements  or  understandings  between  them  other  than  as  are  herein  set  forth.  Subject  to  Section  11.01,  this  Lease  and  its  Schedules  and  riders  may  not  be  modified  except  by
agreement in writing executed by the Landlord and Tenant.

Section 11.13 Governing Law

This Lease shall be construed in accordance with and governed by the laws of the Province.

Section 11.14 Time of the Essence

Time is of the essence of this Lease.

Section 11.15 Quiet Enjoyment

If the Tenant pays Rent, fully observes and performs all of its obligations under this Lease, and there has been no Event of Default, the Tenant shall be entitled to peaceful and quiet enjoyment of
the Premises for the Term without interruption or interference by the Landlord or any Person claiming through the Landlord.

Section 11.16 Energy Conservation

In addition to the requirements set out in the Environmental Management Plan, the Tenant covenants with the Landlord to cooperate with the Landlord and to comply with all regulations, orders,
laws and requirements passed by any governmental authorities or other agencies having jurisdiction respecting energy conservation, waste reduction, emissions reduction or any other related
initiatives in relation to the use, occupancy, maintenance and operation of the Building, or any part thereof. The Tenant shall, at its cost, comply with all reasonable requests and demands of the
Landlord made with a view to energy conservation, waste reduction, emissions reduction or any other related initiatives. Any costs the Landlord incurs in an effort to promote the foregoing and
complying with such regulations, orders, laws and requirements shall be added to

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Operating Costs in the financial year of the Landlord or portion thereof that such expenditures are incurred. The Landlord shall not be liable as a result of undertaking any action or work to
comply with any such regulations, orders, laws and requirements even where the same results in a reduction, change, or elimination in heating, ventilation or air-conditioning in the Premises or
Building, or any part thereof, or any other service or utility provided by the Landlord.

Section 11.17 1ndemnity Agreement

If  any  Indemnifier  is  named  in  this  Lease,  the  Indemnifier  agrees  to  execute  and  deliver  to  the  Landlord  an  indemnity  agreement  in  the  form  attached  as  Schedule  ‘‘F’’  hereto  (with  blanks
completed) with respect to this Lease and any and all renewals hereof; and the Tenant agrees that failure of the Indemnifier to do so shall constitute an Event of Default.

Section 11.18 Confidentiality

The Tenant acknowledges that the terms, conditions and provisions of this Lease are of a highly confidential nature and therefore agrees on behalf of itself, its directors, officers, employees,
agents, affiliates, and any other Persons having access to this Lease through the Tenant, that the terms, conditions and provisions of this Lease will remain confidential and further that no term,
condition or provision of this Lease will be communicated to a third party without the express written consent of the Landlord. Only in the event that the Landlord first provides its express written
consent to the Tenant to release any or all the terms, conditions and provisions of Lease to a third party, the Tenant agrees to obtain from that third party, a suitable confidentiality and non-
disclosure  agreement  obliging  the  third  party  to  keep  confidential  the  terms,  conditions  and  provisions  of  this  Lease.  These  confidentiality  provisions  shall  survive  the  expiration  or  earlier
termination of this Lease. A violation of these confidentiality obligations shall be deemed to constitute an Event of Default.

Section 11.19 Execution

If the Tenant is a corporation, the Tenant confirms and agrees that this Lease has been executed by its authorized signatories and that if only one signatory has signed this Lease, the Tenant is
authorized by its articles of incorporation or other constating documents to execute leases by such sole authorized signatory and if this Lease is not executed under seal by the Tenant, the Tenant
is authorized by its articles of incorporation or other constating documents to execute leases without a seal.

Section 11.20 Accord and Satisfaction

No payment by the Tenant or receipt of the Landlord of a lesser amount than the monthly instalment of Net Rent and Additional Rent herein stipulated will be deemed to be other than on account
of the earliest stipulated monthly instalment of Net Rent and Additional Rent, nor will an endorsement or statement on a cheque or in a letter accompanying a cheque or payment as Rent be
deemed an acknowledgement of full payment or an accord and satisfaction, and the Landlord may accept a cheque or payment without prejudice to the Landlord's right to recover the balance of
the Rent or pursue any other remedy. No payment of Rent hereunder made by any third party and accepted by the Landlord will constitute or in any way be interpreted to be the consent or
acknowledgement by the Landlord to an assignment or subletting by the Tenant.

Section 11.21 Head Lease

The Tenant acknowledges that the Landlord is the current tenant of the Lands pursuant to an indenture of lease made as of the 24th day of February, 1984 and originally between the Bank of
British Columbia, J.K.S. Holdings Ltd. and IBC Properties Limited, as landlords, and lmbrook Properties Limited, as tenant, registered in the Lower Mainland Land Titles Office ("LTO") under
No. M14613, as amended by lease amending agreements made as of the 16th day of August, 1984 and the 18th day of November, 1985 registered in the LTO under Nos. M68521 and P12195,
respectively, and assigned and amended by an assignment and modification of lease agreement made as of the 31st day of March 1989 and registered in the LTO   under Nos. GC46629 and
GC46630, respectively, and by a non-disturbance agreement registered in the LTO   under No. BK312523 and assumed by the Landlord pursuant to an Assignment of Land Lease effective the 1st
day of September, 2005 and filed for registration in the LTO   on September 1, 2005 under Nos. BX186432 and BX186433.

Section 11.22 Landlord's Limited Recourse and Severability

The Tenant acknowledge and agrees that (i) only the interest of Landlord (which, as at date of this Lease, is comprised of Van885 West Georgia LP, by its general partner Van885 West Georgia
GP Ltd. and Ontrea Inc., each as to an undivided 50% interest) in the Building shall be bound hereby and the obligations hereunder are not otherwise binding upon nor shall resort be had to any
other property of the Landlord; and (ii) the rights and obligations hereunder of each party comprising the Landlord shall be several in accordance with each such party's respective ownership
interest in the Building, and not either joint or joint and several.

Section 11.23 Tenant Inducement

Subject to the Required Conditions, the Landlord will pay the Tenant a Leasehold Improvement allowance of SEVEN DOLLARS ($7.00) per square foot of the Rentable Area of the
Premises, plus goods and services tax if applicable (the "Allowance") to be applied towards the cost of construction of the Tenant's Leasehold Improvements. Ninety percent (90%) of
the Allowance will be paid within thirty (30) days after the last to occur of:

(a)

(b)

the execution of the Lease by all parties;

the commencement of the Term;

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(c)

(d)

satisfactory  completion  of  the  construction  of  the  Tenant's  Leasehold  Improvements  in  accordance  with  terms  and  conditions  provided  in  this  Lease  and  delivery  to  the
Landlord of such post-construction documentation that the Landlord reasonably requires;

receipt by the Landlord of a statutory declaration from the Tenant documenting (i) that payment has been made in full to all contractors, sub-contractors, suppliers and any
other personnel retained to complete construction of the Tenant's Leasehold Improvements; (ii) that construction of the Tenant's Leasehold Improvements has been carried out
and performed in accordance with all applicable by-laws, rules, regulations and orders of any lawful authority (iii) the last date on which any work was done or materials were
provided  in  connection  with  the  construction  of  the  Leasehold  Improvements;  and  (iv)  that  all  assessments  under  the  Workers'  Compensation  Act  against  the  Tenant,  its
contractors, subcontractors and other persons or business entities who perfonned work in the Building or the Premises in connection with the Tenant's work have been paid in
full; and

(e)

the delivery to the Landlord of an invoice for ninety percent (90%) of the Allowance (plus GST as applicable), such invoice to include the Tenant's business number(s).

The remaining ten percent (10%) of the Allowance will be paid forthwith after the expiry of the applicable statutory lien period, provided no liens have been registered in respect of
the  Tenant's  Leasehold  Improvements  and  provided  that  the  Tenant  has  delivered  to  the  Landlord  an  invoice  for  the  remaining  ten  percent  (10%)  of  the  Allowance  (plus  GST  as
applicable), such invoice to include the Tenant's business number(s). The Tenant will deliver to the Landlord copies of bona fide receipts, paid invoices or other evidence acceptable to
the Landlord substantiating the materials and services supplied on account of the Renovation. Provided that the Required Conditions are satisfied and the Tenant has claimed and
received 90% of the Allowance in accordance with this Section 11.23 and the remaining 10% is due and payable, to the extent that the Allowance exceeds the amount that has been
spent  on  the  construction  of  the  Tenant's  Leasehold  Improvements,  such  extra  amount,  up  to  a  maximum  limit  of  TWO  Dollars  ($2.00)  per  square  foot,  shall  be  applied  by  the
Landlord to the next Rent due under the Lease.

Section 11.24 Parking

Subject to the Required Conditions, the Landlord agrees to make available to the Tenant during the Tenn EIGHT (8) unreserved parking spaces in the parking facility provided for
the Building. The Tenant shall pay parking fees to the Landlord (or to the parking operator if the Landlord so directs) throughout the Tenn at the prevailing rates being charged for
parking pennits in the parking facility, from time to time. Each such payment shall be made in advance on the first day of each month throughout the Tenn. The use of each parking
pennit by the Tenant is subject to the following conditions:

(a)

(b)

(c)

(d)

(e)

(f)

one vehicle will be designated by the Tenant for each pennit and initially the Tenant will be issued by the Landlord (or the parking operator) the number or parking permits
requested by the Tenant under Section 11.24(e);

the Landlord reserves the right to make such Rules and Regulations with respect to the use of the parking facility provided for the Building as the Landlord deems advisable
from time to time;

the use by the Tenant of the parking facility is subject to the exclusive control of the Landlord;

the Tenant shall use the parking facility at its sole risk;

the Tenant shall give the Landlord not less than one month written notice prior to the Commencement Date setting out the number of parking permits (subject to the maximum
number of parking spaces set out above) it requires as at the Commencement Date; and

following the expiry of the first two (2) full calendar months of the parking agreement (as described below), the Tenant shall give one month prior written notice if it requires an
increase or decrease in the number of parking permits at any given time, and permits must be used from the first day of a calendar month to the last day of a calendar month. If
the Tenant requests an increase in its number of permits at any time after the notice provided under Section 11.24(e), such request for an increase in the number of permissible
parking permits shall be subject to availability at the time of the request, and the Landlord will have no liability to the Tenant if the Landlord (or the parking operator) is
unable to satisfy such request; and

(g)

the  Tenant  shall  enter  into  a  separate  parking  agreement  with  the  Landlord  (or  the  parking  operator  if  the  Landlord  so  directs)  in  the  Landlord's  standard  form  (or  the
parking operator's standard form, as the case may be) with respect to the above mentioned parking spaces.

Section 11.25 Option to Extend

Provided that:

(a)

(b)

the Required Conditions have been met; and

the Tenant has given written notice to the Landlord no less than twelve (12) months and no more than eighteen (18) months prior to the expiration of the initial Term of its
intention to exercise the within option to extend;

the Landlord will grant to the Tenant the right to extend the Term of the Lease for the Premises on an "as is" basis for a further period of FIVE (5) years (the "Extension of Term")
commencing upon the expiration of the initial Term, and such Extension of Term shall be upon the same terms and conditions as during the Term, save and except: (i) there shall be no
further right to extend the Term, (ii) there will be no inducement or leasehold improvement allowance payable to the Tenant, (iii) there will be no rent free period or Landlord's Work,
and (iv) the rental rate will be the fair market net rental rate for extending tenants for similar improved premises in a similar building with similar amenity packages

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and location at the time of the exercise by the Tenant of the within option to extend (the "Extension Rent"), provided that in no event shall the Extension Rent be less than the rate
payable during the last year of the initial Term.

The Landlord may, at its option, require that the Tenant (i) execute a new lease on the Landlord's standard lease for the Building currently in use at the time of the Tenant's exercise of
the option to extend, or (ii) enter into an extension agreement in order to give effect to the Extension of Term and the revised rental, but the Tenant shall be deemed to have exercised
the option to extend on the terms referred to above upon delivery of said notice to the Landlord whether or not such a new lease or extension agreement is executed.

If the Tenant fails to give the appropriate notice within the time limit set out herein for extending the Term then this option to extend shall be null and void and of no further force or
effect. If the Tenant gives such appropriate notice within the time limit set out herein for extending the Term it will forthwith execute the documentation submitted by the Landlord as
hereinbefore set out within ten (10) days of its receipt thereof.

Section 11.26 Subject to Vacant Possession

The  Tenant  acknowledges  that  the  Premises  are  presently  occupied  by  and  subject  to  a  lease  in  favour  of  a  third  party.  Notwithstanding  anything  contained  in  this  Lease  to  the
contrary, it is understood and agreed by the Landlord and the Tenant that the Tenant's right to occupy the Premises is conditional upon the Landlord obtaining vacant possession of
the Premises from that third party prior to the Commencement Date, failing which the Commencement Date and all other relevant dates shall be postponed by notice in writing from
the Landlord. The Tenant agrees to execute any further documentation, prepared by the Landlord, and which the Landlord, acting reasonably, determines is necessary to give effect to
the foregoing.

IN WITNESS WHEREOF the Landlord and Tenant have executed this Lease.

) VAN8855 WEST GEORGIA LP by its general partner, ) VAN8855 WEST GEORGIA GP LTD. and ONTREA INC., ) both by their duly authorized agents,  ) THE CADILLAC FAIRVIEW CORPORATION LIMITED  ) (collectively, Landlord) ) ) Per: /s/ ELLIGIBLE ) Authorized Signature ) ) Per: /s/ ELLIGIBLE ) Authorized Signature ) ) I/We have authority to bind the corporation. ) ) SIERRA ONCOLOGY CANADA ULC ) (Tenant) ) Per: /s/ ELLIGIBLE ) Authorized Signature ) ) Per: /s/ ELLIGIBLE ) Authorized Signature ) ) I/We have authority to bind the corporation.

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Those lands and premises lying and being in the City of Vancouver in the Province of British Columbia more particularly known and described as

SCHEDULE ‘‘A’’ - LEGAL DESCRIPTION OF THE LANDS

Lots 5-20, both inclusive 
Block 41 
District Lot 541 
Plan 210

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SCHEDULE "B" - FLOOR PLAN OF THE PREMISES

The purpose of this plan is to identify the approximate location of the Premises in the Building.

Floor plan HSBC BUILDING 885 west George street Vancouver, B>C> 21st floor Hornby street lane west Georgia street company logo

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In this Lease and in the Schedules to this Lease:

SCHEDULE ‘‘C’’- DEFINITIONS

"Additional Rent" means all sums of money required to be paid by the Tenant under this Lease (except Net Rent) whether or not the same are designated "Additional Rent" or are payable to the
Landlord or otherwise.

"Alterations" means all repairs, replacements, improvements or alterations to the Premises by the Tenant and the placing of a load of more than 50 lbs per square foot in any part of the Premises
or the relocation of any such load.

"Architect" means the architect or land surveyor or other qualified expert from time to time named by the Landlord.

"BOMA Standard" means the standard method for measuring floor area in office buildings as sanctioned by the Building Owners and Managers Association International which is set out in
Section 1.01 (d), provided that the Landlord may, at any time after the fifth anniversary of the Commencement Date of the Term, at the Landlord's discretion and upon notice in writing to
the Tenant, substitute for this standard any subsequent standard of measure published by BOMA or by any organization or authority performing a function similar to that performed by BOMA.

"Building" means the multi-storey building set out in Section 1.01 (a) and situated on the Land described in Schedule "A" from and including the ground floor of such Building to and including
the roof thereof and including all premises rented or intended to be rented therein, whether for office, retail, cafeteria, banking or other purposes; and the areas, building systems and facilities
serving the Building or having utility in connection therewith, as determined by the Landlord, whether or not located directly under the Building, which areas and facilities may include, without
limitation,  the  roof,  internal  malls,  passageways,  tunnels,  concourses,  sidewalks  and  plazas,  supports  to  accommodate  any  +15  bridge,  if  any,  entrances  and  exits,  exhibit  areas,  storage  and
mechanical areas, janitor rooms, mail rooms, telephone, mechanical and electrical rooms, heating, ventilating and air conditioning systems, fire prevention, security, communication and music
systems, common washrooms, stairways, escalators, elevators, truck and receiving areas, roadways and driveways, parking facilities, loading docks and corridors all as may be altered, expanded,
reduced or reconstructed from time to time.

"Business Tax" means all business, sales, machinery, or other taxes, rates, duties, assessments, license fees and other charges levied, charged or imposed by any competent authority with respect
to the business operations of the Tenant (whether imposed on the Landlord or Tenant) or attributable to the personal property, trade fixtures, business, income, occupancy or sales of the Tenant or
any other occupant of the Premises and to any leasehold improvements installed in the Premises and to the use of the Building or Lands by the Tenant.

"Capital Tax" is an amount determined by multiplying each of the "Applicable Rates" by the "Building Capital" and totalling the products. "Building Capital" is the amount of capital which the
Landlord  determines,  without  duplication,  is  invested  from  time  to  time  by  the  Landlord,  the  owners,  or  all  of  them,  in  doing  all  or  any  of  the  following:  acquiring,  developing,  expanding,
redeveloping and improving the Lands and Building. Building Capital will not be increased by any financing or refinancing except to the extent that the proceeds are invested directly as Building
Capital. An "Applicable Rate" is the capital tax rate specified from time to time under any statute of Canada and any statute of the Province which imposes a tax in respect of the capital of
corporations. Each Applicable Rate will be considered to be the rate that would apply if none of the Landlord or the owners employed capital outside of the Province.

"Carbon Offset Credits" shall mean and refer to activities undertaken by either the Landlord or the Tenant which cause, directly or indirectly, measurable greenhouse gas emission reductions or
removal enhancements within or in respect of the Building and that have financial or exchange value in the regulatory or voluntary market.

"Carbon Tax" means the aggregate of all taxes, rates, duties, levies, fees, charges and assessments whatsoever, imposed, assessed, levied, confirmed, rated or charged against or in respect of the
energy consumption of the Building or the emissions of greenhouse gases from the Building or any part of it or levied in lieu thereof, levied against the Landlord by any local, provincial or
federal government or any agency thereof having jurisdiction.

"Change of Control" means, in the case of any corporation or partnership, the transfer or issue by sale, assignment, subscription, transmission on death, mortgage, charge, security interest,
operation of law or otherwise, of any shares, voting rights or interest which would result in any change in the effective control of such corporation or partnership unless such change occurs as a
result  of  trading  in  the  shares  of  a  corporation  listed  on  a  recognized  stock  exchange  in  Canada  or  the  United  States  and  then  only  so  long  as  the  Landlord  receives  assurances  reasonably
satisfactory to it that there will be a continuity of management and of the business practices of such corporation notwithstanding such Change of Control.

"Commencement Date" means the date on which the Term commences as set out in Section 1.01 (e).

"Environmental  Laws"  means  all  applicable  federal,  provincial  and  municipal  laws,  regulations,  by-laws,  standards,  requirements,  ordinances,  codes,  policies,  guidelines,  orders,  notices,
permits or directives, or parts thereof, pertaining to protection, conservation, utilization, impairment or degradation of the environment in effect as of the date hereof and as may be brought into
effect or amended at a future date.

"Environmental Management Plan" means those provisions set out in Schedule "E" attached hereto. An "Event of Default" shall occur whenever:

(a)

any Rent is in arrears and is not paid within five (5) days after written demand by the Landlord;

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(b)

the Tenant has breached any of its obligations in this Lease (other than the payment of Rent) and:

(i)

(ii)

fails to remedy such breach within fifteen (15) days (or such shorter period as may be provided in this Lease); or

if such breach cannot be reasonably remedied within fifteen (15) days or such shorter period, the Tenant fails to commence to remedy such breach within such fifteen (15) days or
shorter period or thereafter fails to proceed diligently to remedy such breach; in either case after notice in writing from the Landlord;

the Tenant or any Indemnifier becomes bankrupt or insolvent or takes the benefit of any statute for bankrupt or insolvent debtors or makes any proposal, assignment or arrangement with
its creditors, or any steps are taken or proceedings commenced by any Person for the dissolution, winding-up or other termination of the Tenant's existence or the liquidation of its assets;

a trustee, receiver, receiver/manager or like Person is appointed with respect to the business or assets of the Tenant or any Indemnifier;

the Tenant makes a sale in bulk of all or a substantial portion of its assets other than in conjunction with a Transfer approved by the Landlord;

this Lease or any of the Tenant's assets are taken under a writ of execution;

the Tenant purports to make a Transfer other than in compliance with the provisions of this Lease;

the Tenant abandons or attempts to abandon the Premises or disposes of its goods so that there would not after such disposal be sufficient goods of the Tenant on the Premises subject to
distress to satisfy Rent for at least three (3) months, or the Premises become vacant and unoccupied for a period of ten (10) consecutive days or more without the consent of the Landlord;

any insurance policies covering any part of the Building or any occupant thereof are actually or threatened to be cancelled or adversely changed as a result of any use or occupancy of the
Premises;

the Tenant shall default in the full and timely performance of any covenant of this Lease and any such default shall be repeated two (2) times in any Fiscal Year, notwithstanding that such
defaults may have been cured within the period after notice has been provided pursuant to the terms hereof;

an Event of Default as defined in this paragraph occurs with respect to any lease or agreement under which the Tenant occupies other premises in the Building;

the Tenant or any Indemnifier is a corporation and at any time during the Term does not remain in good standing with the Office of the Registrar of Companies for the Province; or,

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(I)

(m)

the Tenant defaults in connection with the Existing Sublease Consent (as defined below) beyond any applicable cure period.

"Existing Sublease Consent" means the consent to sublease and made among the Landlord as successor in interest to Ontrea Inc., Thompson Creek Metals Company Inc. as tenant
and the Tenant as sub-tenant dated February 27, 2015 under which the Tenant presently sublets and occupies the Premises as sub-tenant.

"Fiscal Year" means (i) the period of time commencing on the Commencement Date and ending on the last day of the next ensuing October; and (ii) thereafter the period of time commencing on
the first day of November and ending on the last day of the next ensuing October, or (iii) the fiscal period designated by the Landlord from time to time.

"Fixturing Period" means the period specified in Section 1.01 (h).

"Hazardous Substance" means any substance or material whose discharge, release, use, storage, handling or disposal is regulated, prohibited or controlled, either generally or specifically, by
any  governmental  authority  pursuant  to  or  under  any  Environmental  Laws,  including,  but  not  limited  to,  any  contaminant,  pollutant,  deleterious  substance,  or  material  which  may  impair  the
environment, petroleum and other hydrocarbons and their derivatives and by-products, dangerous substances or goods, asbestos, gaseous, solid and liquid waste, special waste, toxic substance,
hazardous or toxic chemical, hazardous waste, hazardous material or hazardous substance, either in fact or as defined in or pursuant to any Environmental Laws.

"Indemnifier" means the Person, if any, who has executed or agreed to execute the indemnity Agreement attached to this Lease as Schedule “F”, or any other indemnity agreement in favour of
the Landlord.

"Landlord" means the party named as landlord on the first page of this Lease and those for whom it is responsible at law.

"Lands" means the lands situated in the city of Vancouver in the Province in which the Building is constructed, as more particularly described in Schedule "A", or as such lands may be expanded
or reduced from time to time.

"Lease" means this document as originally executed and delivered or as amended from time to time, which amendments shall be in writing, executed and delivered by both the Landlord and the
Tenant.

"Leasehold Improvements" means leasehold improvements in the Premises determined according to common law, and shall include, without limitation, all fixtures, improvements, installations,
alterations  and  additions  from  time  to  time  made,  erected  or  installed  in  the  Premises  by  or  on  behalf  of  the  Tenant  or  any  previous  occupant  of  the  Premises,  including  signs  and  lettering,
partitions, doors and hardware however affixed

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and whether or not movable, all mechanical, electrical and utility installations and all carpeting and drapes with the exception only of furniture and equipment not in the nature of fixtures.

"Mortgage"  means  any  and  all  mortgages,  charges,  debentures,  security  agreements,  trust  deeds,  hypothecs  or  like  instruments  resulting  from  financing,  refinancing  or  collateral  financing
(including renewals or extensions thereof) made or arranged by the Landlord of its interest in all or any part of the Building or Lands.

"Mortgagee" means the holder of, or secured party under, any Mortgage and includes any trustee for bondholders.

"Net Rent" means the annual rent payable by the Tenant under Section 1.01(f).

"Normal Business Hours" means the hours from 6:00 a.m. to 6:00 p.m. on Mondays through Fridays, and the hours from 8:00 a.m. to 2:00 p.m. on Saturdays, unless any such day is a statutory
holiday. Normal Business Hours may be modified or amended by the Landlord from time to time, acting reasonably and consistent with the standards of a first class office building.

"Operating Costs" means, for any period designated by the Landlord, (without duplication) any amounts, whether direct or indirect, paid, payable or incurred by or on behalf of the Landlord for
maintenance, operation, repair, replacement to and administration of the Lands and Building including without limitation the fitness centre (if any) or allocated by the Landlord to the Lands and
Building and for services provided generally to tenants, calculated as if the Building were 100% occupied by tenants during the Term, including without limitation:

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(I)

the  cost  of  insurance  which  the  Landlord  is  obligated  or  permitted  to  obtain  under  this  Lease  and  any  deductible  amount  applicable  to  any  claim  made  by  the  Landlord  under  such
insurance;

the  cost  of  security,  janitorial,  cleaning,  landscaping,  window  cleaning,  garbage  removal  and  snow  removal  services  and  periodic  sanding,  the  cost  of  providing  loudspeakers,  public
address and musical broadcasting systems and providing fire protection and detection systems, communications systems and connections, the cost of operating and maintaining supply
holding areas, storage areas, loading docks, bays or areas and truckways;

the cost of heating, ventilating and air-conditioning;

the cost of fuel, steam, water, electricity, telephone and other utilities used in the maintenance, operation or administration of the Building, including the replacement of building standard
electric bulbs, tubes, starters and ballasts; including charges and imposts related to such utilities to the extent such costs, charges and imposts are not recovered from other tenants;

management  office  expenses  of  operation  (or  to  the  extent  there  is  no  on-site  management  offices,  a  portion  of  the  operating  expenses  of  the  off-site  management  office  bearing
responsibility for, inter alia, the Building determined by the Landlord on an equitable basis), including the fair market rental value of any space used by the Landlord and/or its manager in
connection  with  the  repair,  maintenance,  operation  or  management  of  the  Building  and  salaries,  wages  and  other  amounts  paid  or  payable  for  all  personnel  involved  in  the  repair,
maintenance, operation, management, security, supervision or cleaning of the Building, including fringe benefits, employment and worker's compensation insurance premiums, pension
plan contributions and other employment costs and the cost of engaging contractors for the repair, maintenance, security, supervision or cleaning of the Building;

auditing, accounting, legal and other professional and consulting fees and disbursements;

the costs: (i) of repairing, operating and maintaining the Building (including the parking facilities) and the equipment serving the Building and of all replacements and modifications to the
Building  or  such  equipment,  including  those  made  by  the  Landlord  in  order  to  comply  with  laws  or  regulations  affecting  the  Building;  (ii)  incurred  by  the  Landlord  in  providing  and
installing  energy  conservation  equipment  or  systems  and  life  safety  systems;  (iii)  incurred  by  the  Landlord  to  make  alterations,  replacements  or  additions  to  the  Building  intended  to
reduce operating costs, improve the operation of the Building or maintain its operation as a first class office building; (iv) incurred to replace machinery or equipment which by its nature
requires periodic replacement; and (v) incurred by the Landlord, acting reasonably, in modifying and operating the Building to achieve the objectives of the Environmental Management
Plan; all to the extent that such costs are fully chargeable in the Fiscal Year in which they are incurred in accordance with sound accounting principles;

the cost of the rental of all equipment, supplies, tools, materials and signs;

all costs incurred by the Landlord in administering, contesting or appealing Taxes or related assessments including legal, appraisal and other professional fees, and administration and
overhead costs;

Capital Tax and Carbon Tax;

depreciation or amortization of the costs referred to in paragraph (g) above as determined by the Landlord in accordance with sound accounting principles, if such costs have not been
charged fully in the Fiscal Year in which they are incurred;

interest calculated at two percentage points above the average daily prime bank commercial lending rate charged during such Fiscal Year by any Canadian chartered bank designated from
time to time by the Landlord upon the undepreciated or unamortized balance of the costs referred to in paragraph (k) above; and

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(m)

a  reasonable  fee  for  the  administration  and  management  of  the  Building  equal  to  an  amount  which  the  Landlord  might  reasonably  pay  to  a  third  party  for  the  administration  and
management of developments in the city of Vancouver similar to the Building.

Operating Costs shall exclude or have deducted from them as the case may be:

(aa)

(bb)

all amounts which otherwise would be included in Operating Costs which are recovered by the Landlord from tenants (other than under sections of their leases comparable to section 2.03
of this Lease);

such of the Operating Costs as are recovered from insurance proceeds, warranties or guarantees, to the extent such recovery represents reimbursements for costs previously included in
Operating Costs;

(cc)

interest on debt and capital retirement of debt;

(dd)

ground rent payable by the Landlord to the owner of the Lands under any ground lease of the Lands;

(ee)

(ff)

commissions and other expenses payable in connection with the marketing and leasing of the Building including the cost of any leasehold improvement allowance or other inducement
paid to tenants of the Building; and

the amount of any goods and services tax ("Sales Tax") paid or payable by the Landlord on the purchase of goods and services included in Operating Costs which may be available to the
Landlord as a credit in determining the Landlord's net tax liability or refund on account of Sales Tax.

Operating Costs may be attributed by the Landlord to the various components of the Building in accordance with reasonable and current practices and on a basis consistent with the nature of the
particular costs being attributed, and the costs so attributed may be allocated to the tenants of such components accordingly.

"Person" means any person, firm, partnership or corporation, or any group or combination of persons, firms, partnerships or corporations.

"Possession Date" means the date for possession of the Premises by the Tenant, as set out in Section 1.01(g).

"Premises" means the premises leased to the Tenant described in Sections 1.01 (b) and 1.02 and includes Leasehold Improvements in such premises. The boundaries of the Premises are as
follows: (i) the interior face of all exterior walls, doors and windows; (ii) the interior face of all interior walls, doors and windows separating the Premises from common areas; (iii) the centre line
of all interior walls separating the Premises from adjoining leasable premises; and (iv) the top surface of the structural subfloor and the bottom surface of the structural ceiling.

"Proportionate Share" means a fraction which has as its numerator the Rentable Area of the Premises and as its denominator the Total Rentable Area of the Building.

"Province" means the province in which the Building is located.

"Released Persons" means  collectively  and  individually,  the  Landlord,  any  manager  of  the  Building,  the  owners  of  the  Building,  the  Mortgagee,  and  their  respective  officers,  directors  and
employees, in the course of their employment.

"Rent" means the aggregate of Net Rent and Additional Rent.

"Rentable Area" means the Rentable Area of the Premises and/or other premises in the Building, as determined in accordance with the BOMA Standard.

"Required Conditions" means that the Tenant is the original Tenant, SIERRA ONCOLOGY CANADA ULC, and that the Tenant is not in default and has not been in default under this Lease
during the Term hereof, and that the Tenant is itself in possession of and conducting business in the whole of the Premises in accordance with this Lease.

"Rules and Regulations" means the rules and regulations adopted and promulgated by the Landlord from time to time pursuant to Section 11.01. The Rules and Regulations existing as at the
Commencement Date are those set out in Schedule "D".

"Taxes" means all taxes, levies, charges, local improvement rates and assessments whatsoever assessed or charged against the Building and the Lands or any part thereof by any lawful taxing
authority and including any amounts assessed or charged in substitution for or in lieu of any such taxes, but excluding only such taxes as capital gains taxes, corporate, income, profit or excess
profit taxes to the extent such taxes are not levied in lieu of any of the foregoing against the Building or Lands or the Landlord in respect thereof. Taxes shall in every instance be calculated on the
basis of the Building being fully assessed and taxed at prevailing commercial tax rates for occupied space for the period for which Taxes are being calculated.

"Tenant" means the party named as tenant on the first page of this Lease, and those for whom it is responsible in law.

"Tenant Construction Manual" means the tenant construction and improvements manual or other similar document supplied by the Landlord from time to time to office tenants of the Building
intending to perform alterations to or work within their respective premises.

"Term" means the period set out in Section 1.01 (e).

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"Total Rentable Area of the Building" means the aggregate of the Rentable Area of each floor in the Building intended for office or retail use as if each floor is occupied by one tenant, all as
determined by the Architect in accordance with the BOMA Standard. The Total Rentable Area of the Building shall: (a) exclude the main telephone, mechanical, electrical and other utility rooms
and enclosures, public lobbies on the ground floor, and other public space common to the entire Building; and, (b) be adjusted by the Architect from time to time to take account of any structural,
functional or other change affecting the same.

"Trade Fixtures" means trade fixtures as determined at common law, but for greater certainty, shall not include: (a) heating, ventilating or air conditioning systems, facilities and equipment in or
serving the Premises; (b) floor coverings affixed to the floor of the Premises; (c) light fixtures; (d) internal stairways and doors; and, (e) any fixtures, facilities, equipment or installations installed
by or at the expense of the Landlord pursuant to this Lease or otherwise.

"Transfer" means an assignment of this Lease in whole or in part, a sublease of all or any part of the Premises (whether by the Tenant or by a subtenant), any transaction whereby the rights of
the Tenant under this Lease or the rights of any subtenant or to the Premises are transferred to another, any transaction by which any right of use or occupancy of all or any part of the Premises is
conferred  upon  anyone,  any  mortgage,  charge  or  encumbrance  of  this  Lease  or  the  Premises  or  any  part  thereof  or  other  arrangement  under  which  either  this  Lease  or  the  Premises  become
security for any indebtedness or other obligations and includes any transaction or occurrence whatsoever (including, but not limited to, expropriation, receivership proceedings, seizure by legal
process and transfer by operation of law), which has changed or might change the identity of the Persons having lawful use or occupancy of any part of the Premises or which creates a security
interest in any part of the Premises, including without limitation, any of the Leasehold Improvements.

"Transferee" means the Person or Persons to whom a Transfer is or is to be made.

"Useable Area" means the Useable Area of the Premises as defined and determined in accordance with the BOMA Standard.

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1 .

2.

3.

4.

5.

SCHEDULE "D" - RULES AND REGULATIONS

Life Safety.
(a)
The Tenant shall not do or permit anything to be done in the Premises, or bring or keep anything therein which will in any way increase the risk of fire or the rate of fire
insurance on the Building or on property kept therein, or obstruct or interfere with the rights of other tenants or in any way injure or annoy them or the Landlord, or contravene the fire
code or the regulations of the Fire Department, or any insurance requirements with respect to the Lands or Building or in any part thereof, or violate or act in conflict with any statutes,
rules and ordinances governing health and safety standards or with any other statute or municipal by-law.
(b)
in the Premises.

No inflammable oils or other inflammable, dangerous or explosive materials save those approved in writing by the Landlord's insurers shall be kept or permitted to be kept

Security.
(a)
The Landlord shall permit the Tenant and the Tenant's employees and all Persons lawfully requiring communication with them to have the use, during Normal Business
Hours in common with others entitled thereto, of the main entrance and the stairways, corridors, elevators, escalators, or other mechanical means of access leading to the Building and the
Premises. At times other than during Normal Business Hours the Tenant and its employees shall have access to the Building and to the Premises only in accordance with the Rules and
Regulations  and  shall  be  required  to  satisfactorily  identify  themselves  and  to  register  in  any  book  which  may  at  the  Landlord's  option  be  kept  by  the  Landlord  for  such  purpose.  If
identification is not satisfactory, the Landlord is entitled to prevent the Tenant or the Tenant's employees or other Persons lawfully requiring communication with the Tenant from having
access to the Building and to the Premises. In addition, the Landlord is not required to open the door to the Premises for the purpose of permitting entry therein to any Person not having a
key or passcard to the Premises.
(b)
The Tenant shall not place or cause to be placed any additional locks upon any doors of the Premises without the approval of the Landlord. Two keys shall be supplied to the
Tenant for each entrance door to the Premises and all locks shall be Building standard to permit access by the Landlord's master key. If additional keys are required, they must be obtained
from the Landlord at the cost of the Tenant. Keys or other means of access for entrance doors to the Building will not be issued without the written authority of the Landlord.

The Tenant shall not place or maintain any supplies, or other articles in any vestibule or entry to the Premises, on the adjacent footwalks or elsewhere on the exterior of the

Housekeeping.
The Tenant shall permit window cleaners to clean the windows of the Premises during Normal Business Hours.
(a)
(b)
The Tenant shall not place any debris, garbage, trash or refuse or permit same to be placed or left in or upon any part of the Lands or Building outside of the Premises, other
than in a location provided by the Landlord specifically for such purposes, and the Tenant shall not allow any undue accumulation of any debris, garbage, trash or refuse in or outside of
the Premises. If the Tenant uses perishable articles or generates wet garbage, the Tenant shall provide refrigerated storage facilities suitable to the Landlord.
(c)
Premises or elsewhere on the Lands or Building.
(d)
The sidewalks, entrances, passages, escalators, elevators and staircases shall not be obstructed or used by the Tenant, its agents, servants, contractors, invitees or employees
for any purpose other than ingress to and egress from the Premises and the Building. The Landlord reserves entire control of all parts of the Lands and Building employed for the common
benefit  of  the  tenants  and  without  restricting  the  generality  of  the  foregoing,  the  sidewalks,  entrances,  corridors  and  passages  not  within  the  Premises,  washrooms,  lavatories,  air
conditioning closets, fan rooms, janitor's closets, electrical closets and other closets, stairs, escalators, elevator shafts, flues, stacks, pipe shafts and ducts and shall have the right to place
such signs and appliances therein, as it deems advisable, provided that ingress to and egress from the Premises is not unduly impaired thereby.
(e)
nuisance in the Premises; or any use or manner of use causing a hazard or annoyance to other occupants of the Building or to the Landlord.

The Tenant shall not cause or permit: any waste or damage to the Premises; any overloading of the floors or the utility, electrical or mechanical facilities of the Premises; any

Hand trucks, carryalls or similar appliances shall only be used in the Building with the consent of the Landlord and shall be equipped with rubber tires, slide guards and such

The Tenant shall not receive or ship articles of any kind except through designated facilities and doors and at hours designated by the Landlord and under the supervision of

Receiving, Shipping, Movement of Articles.
(a)
the Landlord.
(b)
other safeguards as the Landlord requires.
The Tenant, its agents, servants, contractors, invitees or employees, shall not bring in or take out, position, construct, install or move any safe, business machinery or other
(c)
heavy machinery or equipment or anything liable to injure or destroy any part of the Building, including the Premises, without first obtaining the consent in writing of the Landlord. In
giving such consent, the Landlord shall have the right in its sole discretion, to prescribe the weight permitted and the position thereof, the use and design of planks, skids or platforms, and
to distribute the weight thereof. All damage done to the Building, including the Premises, by moving or using any such heavy equipment or other office equipment or furniture shall be
repaired at the expense of the Tenant.
The moving of all heavy equipment or other office furniture shall occur only by prior arrangement with the Landlord. The cost of such moving shall be paid by the Tenant. Safes and other
heavy office equipment and machinery shall be moved through the halls and corridors only in a manner expressly approved by the Landlord. No freight or bulky matter of any description
will be received into any part of the Building, including the Premises, or carried in the elevators except during hours approved by the Landlord.

Prevention of Injury to Premises.
It shall be the duty of the Tenant to assist and co-operate with the Landlord in preventing injury to the Premises.
(a)
(b)
The Tenant shall not deface or mark any part of the Building, including the Premises, and shall not drive nails, spikes, hooks or screws into the walls, floors, ceilings or
woodwork of any part of the Building, including the Premises, or bore, drill or cut into the walls, floors, ceilings or woodwork of any part of the Building including the Premises, in any
manner or for any reason. (c) If the Tenant desires

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6.

7.

8.

9.

10.

11 .

12.

telecommunications connections, the Landlord, in its sole discretion, may direct the electricians as to where and how the wires are to be introduced. No gas pipe or electric wire will be
permitted which has not been ordered or authorized by the Landlord. No outside antenna shall be allowed on any part of the Premises or Building without authorization in writing by the
Landlord.

Windows.
Except for the proper use of approved blinds and drapes, the Tenant shall not cover, obstruct or affix any object or material to any of the skylights and windows that reflect or admit light
into any part of the Building, including, without limiting the generality of the foregoing, the application of solar films.

Washrooms.
(a)
The Landlord shall permit the Tenant and the employees of the Tenant in common with others entitled thereto, to use the washrooms on the floor of the Building on which
the Premises are situated or, in lieu thereof, those washrooms designated by the Landlord, save and except when the general water supply may be turned off from the public main or at
such other times when repair and maintenance undertaken by the Landlord shall necessitate the non-use of the facilities.
(b)
substances shall be thrown into them. Any damage resulting from misuse by the Tenant or its agents, servants, invitees, or employees shall be repaired at the expense of the Tenant.

The water closets and other apparatus shall not be used for any purposes other than those for which they were intended, and no sweepings, rubbish, rags, ashes or other

No cooking or heating of any foods or liquids (other than the use of microwave ovens or coffee makers or kettles) shall be permitted in the Premises without the written

The  Premises  shall  not  be  used  for  sleeping  apartments  or  residential  purposes,  or  for  the  storage  of  personal  effects  or  articles  other  than  those  required  for  business

Use of Premises.
(a)
purposes.
(b)
consent of the Landlord.
(c)
The Tenant shall not install or permit the installation or use of any machine dispensing goods for sale in the Premises or the Building or permit the delivery of any food or
beverage to the Premises without the written approval of the Landlord, which consent shall not be unreasonably withheld, or in contravention of the Rules and Regulations. The Tenant
shall not permit the delivery of any food or beverage to the Premises, save and except in accordance with the Landlord's reasonable requirements, including but not limited to sub
clause (d) below with respect to any odours created by such catering.
(d)
The Tenant shall not permit any odours, vapours, steam, water, vibrations, noises or other undesirable effects to emanate from the Premises or any equipment or installation
therein which, in the Landlord's opinion, are objectionable or cause any interference with the safety, comfort or convenience of the Building to the Landlord or the occupants and tenants
thereof or their agents, servants, invitees or employees.

Canvassing, Soliciting, Peddling.
Canvassing, soliciting and peddling in or about the Lands and Building are prohibited.

Bicycles.
No bicycles or other vehicles shall be brought within any part of the Lands or Building without the consent of the Landlord.

Animals and Birds.
No animals or birds shall be brought into any part of the Lands or Building without the consent of the Landlord.

Signs and Advertising.
The Tenant shall not paint, affix, display or cause to be painted, affixed or displayed, any sign, picture, advertisement, notice, lettering or decoration on any part of the outside of the
Building or in the interior of the Premises which is visible from the outside of the Building. The Tenant will not paint, affix, display or cause to be painted, affixed or displayed any sign,
picture, advertisement, notice, lettering or decoration on the outside or inside of the Premises for exterior view without the written consent of the Landlord. Any approved signs shall
remain the property of the Tenant and shall be maintained at the Tenant's sole cost and expense. At the expiry of the Term, or earlier termination of this Lease, the Tenant shall remove any
such sign, picture, advertisement, notice, lettering or decoration from the Premises at the Tenant's expense and shall promptly repair all damage caused by such removal. The sign to be
placed on the outside of (or beside, as the case may be) the interior door leading to the Premises shall be: (i) installed by the Landlord at the Tenant's sole cost and expense; (ii) consistent
with the uniform pattern, size and design prescribed by the Landlord; (iii) the property of the Landlord and shall be maintained by the Landlord throughout the Term at the Tenant's sole
cost and expense; and (iv) removed by the Landlord (or, at the Landlord's option, by the Tenant) at the sole cost and expense of the Tenant. All damage caused by the removal of such sign
shall  be  promptly  repaired  by  the  party  that  removed  the  sign,  at  the  Tenant's  sole  cost  and  expense.  The  Tenant's  obligation  to  observe  and  perform  this  covenant  shall  survive  the
expiration of the Term or earlier termination of the Lease.

13.

Directory Board.
The  Tenant  shall  be  entitled  at  its  expense  to  have  its  name  shown  upon  the  directory  board  of  the  Building  and  the  Landlord  shall  design  the  style  of  such  identification  and  shall
determine the number of spaces available on the directory board for each tenant. The directory board shall be located in an area designated by the Landlord in the main lobby of the
Building.

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SECTION 1 - ENVIRONMENTAL OBJECTIVES

1.1

Context

SCHEDULE "E" - ENVIRONMENTAL MANAGEMENT PLAN

The provisions of this Environmental Management Plan have been designed to encourage and promote the implementation of certain environmental objectives on the part of each of the Landlord
and the Tenant. Subject to Section 4.1 of the Schedule "E", a breach by either the Landlord or the Tenant of any of the provisions of this Environmental Management Plan on the part of either the
Landlord or the Tenant to be observed or performed, as the case may be, shall not constitute a default under this Lease, but the party committing such breach agrees, to the extent possible under
the circumstances, to use commercially reasonable efforts to co-operate with the other party to remedy such breach.

1.2

General Objectives

The Tenant acknowledges the Landlord's intention to operate the Building so as to provide for:

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

a comfortable, productive and healthy indoor environment;

reduced energy use and reduced production, both direct and indirect, of greenhouse gases;

reduced use of potable water and the use of recycled water where appropriate;

the effective diversion of construction, demolition, and land-clearing waste from landfill and incineration disposal, and the recycling of tenant waste streams;

the use of cleaning products certified in accordance with EcoLogoM (Canada), Green Seal™ (United States) or equivalent standards;

the facilitation of alternate transportation options for individuals attending at the Building;

the avoidance of high volatile organic compound ("VOC") materials, furniture and improvements within the Building and individual tenant premises; and

the achievement of such other more specific targets as may be determined by the Landlord from time to time.

1.3

Specific Objectives

Notwithstanding the provisions of Section 1.2 in this Schedule "E" above, the Tenant acknowledges that it is the Landlord's intention to meet or exceed the specific targets published from time to
time by the Canada Green Building Council or its successor in order to achieve and maintain the applicable accreditation pursuant to the various LEED or other similar accreditation programs, in
connection with:

(a)

(b)

(c)

overall reduction of utilities (such as electricity, natural gas, water and/or steam) consumed in/by the Building ;

increasing waste diversion rates in the Building; and

reduction of waste generated in the Building.

In  addition,  the  Tenant  acknowledges  that  it  is  the  Landlord's  intention  to  reduce  carbon  dioxide  levels,  through  introduction  of  outside  fresh  air  and  required  number  of  air  changes  in  the
Building to equal or better than the American Society of Heating, Refrigerating and Air-Conditioning Engineers ("ASHRAE") standard 62.1-2007 or equivalent standard as it may be amended or
replaced from time to time.

1.4

Regulatory Standards

Notwithstanding the provisions of Section 1.2 herein, in the event that any governmental authority imposes a resource reduction target on the Building for any utility or resource otherwise than as
set out in Section 1.2 above, then the Environmental Objectives shall be deemed to have been amended so as to stipulate such resource reduction target and all changes required to be made by the
Landlord to the Environmental Management Plan, or which are necessitated as a result of such mandatory resource reduction target, shall be deemed to be included and permitted, as the case may
be, pursuant to the provisions of this Section and this Lease.

1.5

Carbon Offsets

The Landlord shall be entitled to all Carbon Offset Credits that may be created, credited or recoverable as a result of activities conducted within the Premises or the Building, excluding Carbon
Offset Credits to which the Tenant is entitled in accordance with Applicable Law. The Landlord shall be entitled to allocate, acting reasonably, Carbon Offset Credits created with the participation
of the Tenant and/or other tenants in the Building.

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SECTION 2- ENVIRONMENTAL MANAGEMENT PLAN IMPLEMENTATION

2.1

The Tenant agrees to conduct its operations in the Building and within the Premises in accordance with the following provisions:

(a)

Comfortable. Healthy and Productive Indoor Environment

(i)

(ii)

(iii)

(iv)

The Landlord shall be entitled at any time and from time to time to undertake greenhouse gas production monitoring and testing, including testing within the Premises, on
reasonable notice to the Tenant and accompanied by a representative of the Tenant if required, which representative Tenant agrees to make available.

The  Tenant  shall  ensure  that  all  work  done  within  the  Premises  by  the  Tenant  or  its  representatives  shall  be  undertaken  in  accordance  herewith  and  with  the  Tenant
Construction Manual. Notwithstanding the foregoing, the Tenant shall specify that all paints, sealants and adhesives used or to be used within the Premises meet EcoLogoM
(Canada), Green SealTM (United States) or equivalent standards so as to ensure no or low emissions of VOC's within the Building. Landlord may from time to time conduct
tests to measure VOC's within the Premises.

The Tenant shall have regard to the procurement guidelines set out in the Tenant Construction Manual in procuring furniture, fixtures, materials, supplies and equipment to
be brought into the Premises.

To the extent the Tenant is expressly permitted in this Lease to undertake its own cleaning of, or within, the Premises, the Tenant shall require that in any cleaning contracts
gran ted directly by it, the cleaning contractor shall use cleaning 1 products certified in accordance with EcoLogoM (Canada), Green SealTM (United States) or equivalent
standards. The Landlord shall reserve the right to approve, acting reasonably, any such Tenant cleaning contracts, but without liability. The Tenant shall ensure that any
cleaning contracts entered into by it require the cleaning contractor to comply with elements of the Environmental Management Plan applicable to it. Particularly, any such
cleaning contracts that extend to specialized green facilities shall ensure the cleaning contractor properly understands the maintenance of such specialized green facilities.

(v)

At the Tenant's sole cost and expense and if requested by the Tenant, the Landlord agrees at its option, to either purge Building air during a Tenant move in to minimize
offgassing of wallpaper, carpet and furniture glues and dyes or to test for VOC's, in both cases subject to the prior approval of the Landlord acting reasonably.

(b)

Reduce Indirect and Direct Energy Consumption and Greenhouse Gas Emissions

(i)

(ii)

(iii)

The  Tenant  agrees  to  the  installation  of  electricity  smart  meters  in  respect  of  the  Tenant's  consumption  of  electricity  within  the  Premises  that  will  be  connected  to  the
Landlord's metering system for the Building (if one is in place), at the Tenant's sole cost and expense.

The Tenant shall take reasonable steps to minimize its electrical consumption within the Premises such as, by way of example only, adopting conservation practices (e.g.
reducing its use of lighting where unnecessary); the use of Energy Star equipment; the types of lighting, lighting switches, sensors and zones as may be specified in the
Tenant Construction Manual.

The Landlord shall be entitled at any time or from time to time to acquire all or part of the power for the common areas and facilities or shared electrical power from sources
with low carbon output. In addition to the foregoing, where it is considered feasible to do so, the Landlord may install onsite generation capacity either to reduce peak load
or to supplement base load requirements for the Building from time to time, and any incremental cost in so doing shall be included in Operating Costs.

(iv)

The Landlord shall be entitled to benchmark itself against any building rating system for electrical, natural gas, water or other resource consumption.

(v)

The Landlord shall operate Building common areas and facilities in accordance with, and shall encourage other tenants to operate in conformity with, the Environmental
Objectives.

(c)

Reduce Water Consumption

(i)

The Tenant agrees to the installation of water meters or check meters that will be connected to the Landlord's metering system for the Building (if one is in place), in respect
of the Tenant's consumption of water, at the Landlord's option and at the Tenant's sole cost and expense.

(ii) Where  potable  water  usage  is  not  a  necessity,  the  Tenant  acknowledges  and  consents  to  the  use  of  treated  recycled  or  treated  natural  water  in  washrooms  and  in  other

applications within and around the Building.

(iii)

The Tenant consents to rainwater collection, treatment and reuse by the Landlord and wastewater collection, treatment and reuse by the Landlord from time to time. The
Tenant consents to the use of water-saving appliances, such as waterless urinals, and other equipment as may be otherwise consistent with the Environmental Objectives.

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(d)

Recycled Materials Usage

(i)

(ii)

(iii)

(iv)

Tenant shall be entitled to use recycled materials in its Leasehold Improvements and Alterations if so permitted either pursuant to the Tenant Construction Manual, or as
may be consented to by the Landlord, acting reasonably.

Tenant  shall  be  entitled  to  use  recycled  furniture,  fixtures  and  equipment  in  the  Premises  to  the  extent  consistent  with  the  Environmental  Objectives  and  the  Tenant
Construction Manual.

The Tenant agrees to recycle or cause its contractor to recycle any waste created in the construction and/or demolition of Leasehold Improvements or Alterations within the
Premises in accordance with the Tenant Construction Manual, so as to minimize the amount of waste ending in landfill. The Tenant shall provide satisfactory evidence to
the Landlord of such recycling upon request by the Landlord, such as, by way of example, providing copies of waybills indicating the amount of waste recycled and the
amount ending in landfill. The Landlord reserves the right to monitor and measure the amount of waste leaving the Building from the Premises and going to landfill from
time to time. If available, the Landlord agrees to provide to the Tenant a staging area for the sorting and recycling of materials during construction.

If requested  by  the  Tenant,  the  Landlord  will  use  commercially  reasonable  efforts  to  co-operate  with  the  Tenant,  at  the  Tenant's  sole  cost,  in  the  certification  of  the
Premises pursuant to any rating scheme, such as ASHRAE standard 189.1, or equivalent standard as the Landlord may agree to, acting reasonably. The Tenant agrees to
consider locally sourced materials where possible in the completion of Leasehold Improvements and any subsequent Alterations, consistent with the terms as set out in the
Tenant Construction Manual.

SECTION 3- ENVIRONMENTAL ASSESSMENT AND REPORTING

3.1

The Landlord and Tenant, acting reasonably and in good faith, agree to cooperate from time to time in determining compliance with the Environmental Objectives as set out in Section 1
herein and in refining such Environmental Objectives from time to time. The Landlord and the Tenant agree to meet periodically in order to determine and discuss the achievement of the
Environmental Objectives for the Building and the Premises and any further steps that could be taken to achieve the Environmental Objectives. The Tenant agrees to keep such records as
are required by the Landlord to evidence compliance with the Environmental Management Plan.

SECTION 4 - COVENANTS

4.1

The Landlord and Tenant agree to:

(a)

(b)

(c)

use their reasonable commercial efforts to achieve the Environmental Objectives;

constructively consult with each other on enhancements that may achieve the Environmental Objectives and consider undertaking any such enhancements; and

constructively consult with each other on issues, events and circumstances likely to detract from achieving the Environmental Objectives.

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Item

Electronics/Appliances
Canon C5250 64 Printer/Copier/Scanner
Wall mounted televisions
Industrial dishwasher
Standard dishwasher
Fridge
Microwave
Chairs
Swivel
Guest
Armchairs
Dining
Tables
Confererence

Kitchen/Dining
Side Table
Desks
Reception
U-Shaped Executive Desk with 2 drawer
legal filing cabinets and filing pedestal

Left hand bullet desks wih filing
pedestal
Right hand bullet desks wih filing
pedestal
L-shape desks with filing pedestal
Computer desk with filing pedestal
Hotelling Stations/Desks
2 person hotelling station with filing
pedestals
4 person hotelling station with filing
pedestals
Credenzas
Small with enclosed cupboards
Large with enclosed cupboards

Notes

eight person
twelve to sixteen person
four person (round)
six person
round, glass

3 with overhead hutch additions

SCHEDULE “C”

FF&E LIST

#

1
4
2
1
2
2

54
26
2
6

1
1
2
1
1

1
9

3

7

9
1

1

1

1
2

Schedule C - 1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Large with two 2-drawer lateral metal
filing cabinets built in
Tall credenza with enclosed cupboards
Filing Cabinets/Storage Cabinets
4-drawer filing cabinet
2-drawer lateral filing cabinet
3-drawer metal lateral filing cabint
4-drawer metal lateral filing cabint
Large 4-shelf metal storage cabinets
Wall mounted overhead storage
cupboards, enclosed
Freestanding wood look storage
locker/closet
Bookcases
2-shelf bookcase
3-shelf bookcase
4-shelf bookcase
5-shelf bookcase
Whiteboards
Small/personal use
Large/meeting room size
Cork Bulletin Boards
Large
Small
Miscellaneous
4 four foot partition

1

1

2
5
3
3
2
4

1

1
1
1
4

8
5

2
9

1

Schedule C - 2

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT 10.15

OFFICE LEASE

SAN MATEO GATEWAY
1820 GATEWAY DRIVE,
SAN MATEO, CA 94404

KW FUND VI-SAN MATEO, LLC,
a Delaware limited liability company,

as Landlord,

and

SIERRA ONCOLOGY, INC.,
a Delaware corporation,

as Tenant

 
 
 
 
SAN MATEO GATEWAY

SUMMARY OF BASIC LEASE INFORMATION

This  Summary  of  Basic  Lease  Information  (the  "Summary")  is  hereby  incorporated  by  reference  into  and  made  a  part  of  the
attached Office Lease. Each reference in the Office Lease to any term of this Summary shall have the meaning as set forth in this Summary
for such term. In the event of a conflict between the terms of this Summary and the Office Lease, the terms of the Office Lease shall prevail.
Any initially capitalized terms used herein and not otherwise defined herein shall have the meaning as set forth in the Office Lease.

  TERMS OF LEASE

(References are to the Office Lease)

  DESCRIPTION

1.

2.

3.

Dated as of:

Landlord:

Address of Landlord
(Section 24.14):

4.

5.

Tenant:

Address of Tenant
(Section 24.14):

  December 10, 2020

  KW FUND VI-SAN MATEO, LLC, a Delaware limited liability company

  Address For Notices:

c/o CBRE, Inc.
1820 Gateway Drive, Suite 110
San Mateo, CA 94404
Attn: Property Manager
E-Mail: carey.liggett@cbre.com

with a copy to:

c/o Kennedy-Wilson Properties, Ltd.
151 S. El Camino Drive
Beverly Hills, California 90212
Attn: Asset Manager
E-Mail: djamal@kennedywilson.com

and:

c/o Kennedy-Wilson Properties, Ltd.
151 S. El Camino Drive
Beverly Hills, California 90212
Attn: General Counsel
E-Mail: kmouton@kennedywilson.com

Address For Payment of Rent:

KW Fund VI – San Mateo, LLC
P.O. Box 301043
Los Angeles, CA 90030-1043

SIERRA ONCOLOGY, INC.,
a Delaware corporation

Sierra Oncology, Inc.
46701 Commerce Center Drive
Plymouth MI 48170
Attn: Legal
E-Mail: Legal@sierraoncology.com

(Prior to Lease Commencement Date)

and

Sierra Oncology, Inc.
1820 Gateway Drive, Suite 110
San Mateo, California 94404
Attn: Legal

(i)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
E-Mail: Legal@sierraoncology.com

With a copy via email to:

Gabe.chao@transwestern.com

(After Lease Commencement Date)

6.

Premises (Article 1):

6.1

Premises:

  Approximately 3,792 rentable square feet of space located on the first (1st) floor
of  the  Building  (as  defined  below),  as  depicted  on  Exhibit  A  attached  hereto,
known as Suite 110.

6.2

Building:

The Premises are located in the "Building" whose address is 1820 Gateway Drive,
San Mateo, California 94404.

7.

Term (Article 2):

7.1

7.2

Lease Term:

Forty-eight (48) months.

Lease Commencement Date:

The earlier of (i) the date Tenant commences business operations in the Premises,
and (ii) the later of (A) the date that is three (3) business days after the Possession
Date (as that term is defined in Section 1.2 of the Lease), and (B) January 1, 2021.
The  Lease  Commencement  Date  is  anticipated  to  be  January  1,  2021  (the
“Anticipated Lease Commencement Date").

7.3

Lease Expiration Date:

The date which is the last day of the month which is forty-eight (48) months after
the Lease Commencement Date.

8.

Base Rent (Article 3):

Months of Lease Term
1-12*
13-24
25-36
37-48

Annual Base Rent
$211,593.60
$217,941.36
$224,479.68
$231,214.08

Monthly Installment of
Base Rent
$17,632.80
$18,161.78
$18,706.64
$19,267.84

*Subject to abatement during the first four (4) months of the Lease Term pursuant to Section 3.2 of the Office Lease.

9.

Additional Rent (Article 4):

9.1

9.2

Base Year:

Calendar year 2021.

Tenant's  Share  of  Operating
Expenses and Tax Expenses:

5.11% (3,792 rentable square feet within the Premises/74,176 rentable square feet
within the Building) (See Section 4.2.5 of the Office Lease).

Security Deposit (Article 20):

$38,535.68.

Number of Parking Spaces (Article 23):  

Ten (10) unreserved parking spaces (i.e.,  2.7  unreserved  parking  spaces  for  each
1,000 rentable square feet of the Premises).

10.

11.

12.

Brokers (Section 24.19):

Cushman  &  Wakefield,  representing  Landlord,  and  Transwestern  Real  Estate
Services, representing Tenant.

(ii)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
TABLE OF CONTENTS

ARTICLE 1
1.1
1.2
1.3

PROJECT, BUILDING AND PREMISES
Project, Building and Premises
Condition of Premises; Delivery of Possession
Rentable Square Feet

ARTICLE 2

LEASE TERM

ARTICLE 3

BASE RENT

ARTICLE 4
4.1
4.2
4.3
4.4
4.5

ARTICLE 5
5.1
5.2
5.3

ARTICLE 6
6.1
6.2
6.3
6.4
6.5

ARTICLE 7
7.1
7.2

ARTICLE 8
8.1
8.2
8.3

ADDITIONAL RENT
Additional Rent
Definitions
Calculation and Payment of Additional Rent
Taxes and Other Charges for Which Tenant Is Directly Responsible
Late Charges

USE OF PREMISES
Use
Hazardous Materials
Asbestos

SERVICES AND UTILITIES
Standard Tenant Services
Overstandard Tenant Use
Interruption of Use
Additional Services
Access to Building and Parking Facilities

REPAIRS
Tenant's Repairs
Landlord's Repairs

ADDITIONS AND ALTERATIONS
Landlord's Consent to Alterations
Manner of Construction
Landlord's Property

ARTICLE 9

COVENANT AGAINST LIENS

ARTICLE 10
10.1
10.2
10.3
10.4
10.5

ARTICLE 11
11.1
11.2
11.3

INSURANCE
Indemnification and Waiver
Tenant's Compliance with Landlord's Fire and Casualty Insurance
Tenant's Insurance
Subrogation
Additional Insurance Obligations

DAMAGE AND DESTRUCTION
Repair of Damage to Premises by Landlord
Landlord's Option to Repair
Waiver of Statutory Provisions

ARTICLE 12

CONDEMNATION

ARTICLE 13

COVENANT OF QUIET ENJOYMENT

ARTICLE 14
14.1
14.2
14.3
14.4

ASSIGNMENT AND SUBLETTING
Transfers
Landlord's Consent
Transfer Premium
Landlord's Option as to Subject Space

(i)

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5 
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9 
10 

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11 
11 
12 

12 
12 
13 
13 
13 
13 

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14 
14 

14 
14 
14 
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16 
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18 

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19 
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14.5
14.6

Effect of Transfer
Additional Transfers

ARTICLE 15
15.1
15.2

SURRENDER OF PREMISES; REMOVAL OF PERSONAL PROPERTY
Surrender of Premises
Removal of Tenant Property by Tenant

ARTICLE 16

HOLDING OVER

ARTICLE 17

ESTOPPEL CERTIFICATES

ARTICLE 18

SUBORDINATION AND ATTORNMENT

ARTICLE 19
19.1
19.2
19.3
19.4
19.5
19.6
19.7

DEFAULTS; REMEDIES
Defaults
Remedies Upon Default
Payment by Tenant
Subleases of Tenant
Waiver of Default
Efforts to Relet
Landlord's Default

ARTICLE 20

SECURITY DEPOSIT

ARTICLE 21
21.1
21.2

COMPLIANCE WITH LAW
Compliance with Law
CASp

ARTICLE 22

ENTRY BY LANDLORD

ARTICLE 23

TENANT PARKING

ARTICLE 24
24.1
24.2
24.3
24.4
24.5
24.6
24.7
24.8
24.9
24.10
24.11
24.12
24.13
24.14
24.15
24.16
24.17
24.18
24.19
24.20
24.21
24.22
24.23
24.24
24.25
24.26
24.27
24.28
24.29
24.30
24.31

MISCELLANEOUS PROVISIONS
Binding Effect
Tenant's Signs
Modification of Lease
Transfer of Landlord's Interest
Prohibition Against Recording
Captions
Relationship of Parties
Time of Essence
Partial Invalidity
Landlord Exculpation
Entire Agreement
Right to Lease
Force Majeure
Notices
Joint and Several
Authority
Governing Law
Submission of Lease
Brokers
Independent Covenants
Project Name and Signage
Successors
Landlord Renovations
Confidentiality
Landlord's Title; Air Rights
No Waiver
Jury Trial
Attorneys' Fees
Building Directory
Application of Payments
Substitution of Other Premises

(ii)

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26 
26 
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26 
26 

26 

27 
27 
27 

28 

28 

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29 
29 
30 
30 
30 
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30 
30 
30 
31 
31 
31 
31 
31 
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32 
32 
32 
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32 
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32 
32 
33 
33 
33 
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33 

 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
24.32
24.34

Electronic Services
Electronic Signatures

EXHIBITS:

A
B
C
D

FLOOR PLAN OF PREMISES
RULES AND REGULATIONS
AMENDMENT TO OFFICE LEASE
ESTOPPEL CERTIFICATE

(iii)

Page

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36 

 
 
 
 
 
  
 
 
 
SAN MATEO GATEWAY

OFFICE LEASE

This Office Lease, which includes the preceding Summary attached hereto and incorporated herein by this reference (the Office
Lease and Summary to be known sometimes collectively hereafter as the "Lease"), dated as of the date set forth in Section 1 of the Summary,
is made by and between KW FUND VI-SAN MATEO, LLC, a Delaware limited liability company ("Landlord"), and SIERRA ONCOLOGY,
INC., a Delaware corporation ("Tenant").

ARTICLE 1

PROJECT, BUILDING AND PREMISES

1.1

Project, Building and Premises. Upon and subject to the terms set forth in this Lease, Landlord hereby leases to Tenant
and Tenant hereby leases from Landlord the premises described in Section 6.1 of the Summary (the "Premises"), which Premises are located
in the Building (as defined in Section 6.2 of the Summary). The Premises shall not include any storage area in the Building, which shall be
leased, if at all, pursuant to a separate agreement. The floor plan of the Premises is attached hereto as Exhibit A. The Building is part of an
office project currently known as "San Mateo Gateway" The term "Project," as used in this Lease, shall mean (i) the Building, (ii) the other
buildings located at 1800 and 1810 Gateway Drive, San Mateo, California 94404 (collectively, the "Additional Buildings"), (iii) the surface
parking areas serving the Building and the Additional Buildings (collectively, the "Parking Facilities"), (iv) any outside plaza areas, land and
other improvements surrounding the Building and the Additional Buildings, and (v) the land upon which all of the foregoing are situated.
Tenant acknowledges that Landlord has made no representation or warranty regarding the condition of the Project except as specifically set
forth in this Lease. Tenant shall have the right to the nonexclusive use of the common corridors and hallways, stairwells, elevators, restrooms
and other public or common areas located in the Building and/or on the Project; provided, however, that the use thereof shall be subject to the
rules and regulations attached hereto as Exhibit B (the "Rules and Regulations"), as the same may be reasonably modified by Landlord from
time  to  time.  If  there  is  any  conflict  between  the  Rules  and  Regulations  and  the  other  terms  and  provisions  of  this  Lease,  the  terms  and
provisions of this Lease shall control. Landlord reserves the right to make alterations or additions to or to change the location of elements of
the Project and the common areas thereof.

1.2

Condition of Premises; Delivery of Possession; Abatement Penalty.

1.2.1

Condition of Premises; Delivery of Possession. Except as expressly set forth in this Lease, Landlord shall
not be obligated to provide or pay for any improvements, work or services related to the improvement, remodeling or refurbishment of the
Premises,  and  Landlord  shall  tender  possession  of  the  Premises  to  Tenant  in  its  "AS  IS"  condition  .  The  date  of  Landlord's  tendering  of
possession  of  the  Premises  to  Tenant  (as  evidenced  by  notice  from  Landlord  to  Tenant)  following  the  date  that  Landlord’s  Work  is
Substantially Completed (as such terms are defined hereinbelow) is the "Possession Date". If for any reason, Landlord is delayed in tendering
possession of the Premises to Tenant with Landlord’s Work Substantially Completed by any particular date, Landlord shall not be subject to
any liability for such failure, and the validity of this Lease shall not be impaired, except as otherwise provided in Section 1.2.2 below. Tenant
acknowledges  that  neither  Landlord  nor  any  agent  of  Landlord  has  made  any  representation  or  warranty  regarding  the  condition  of  the
Premises, the Building or the Project (except as specifically set forth in this Lease) or regarding the suitability of the Premises for the conduct
of Tenant’s permitted use set forth in Section 5.1 below or for any other purpose. Landlord shall, at Landlord’s expense, in accordance with
Building  standards  and  using  Building  standard  materials,  perform  the  following  work  (collectively,  “Landlord’s  Work”):  (i)  repaint  the
interior painted walls of the Premises; (ii) install new carpet in the carpeted areas of the Premises; (iii) construct three (3) additional private
offices within the Premises along the wall opposite of those certain existing offices currently located in the Premises, which additional offices
shall contain similar lighting, electrical outlets, wiring and finishes as those existing in those certain existing offices located in the Premises;
(iv) relocate that certain server room door to the corner nearest to the kitchen area located in the Premises; (v) install a new dishwasher in the
kitchen area located in the Premises; and (vi) replace all damaged or missing ceiling tiles located in the Premises, as reasonably necessary, as
reasonably  determined  by  Landlord.  For  purposes  of  this  Lease,  Landlord's  Work  shall  be  deemed  "Substantially  Completed"  upon  the
completion  of  performance  of  Landlord's  Work,  except  for  minor  punch-list  items.  If  Landlord  shall  encounter  any  delays  in  causing
Landlord's Work to be Substantially Completed as a result of any acts or omissions (where there is a duty to act) of Tenant, or Tenant's agents
or employees (collectively, "Tenant Delays"), then, notwithstanding anything to the contrary set forth in this Lease, Landlord's Work shall be
deemed to be Substantially Completed as of the date that Landlord's Work would have been Substantially Completed were it not for such
Tenant Delays.

-3-

 
 
1.2.2

Abatement Penalty. Notwithstanding Section 1.2.1 above to the contrary, if Landlord is unable to tender
possession of the Premises to Tenant with Landlord’s Work Substantially Completed on or before the date that is ninety (90) days after the
Anticipated Lease Commencement Date (the "Outside Delivery Date"), as such date shall be extended day for day for each day Landlord is
delayed in tendering possession of the Premises to Tenant with Landlord’s Work Substantially Completed as a result of delays due to Force
Majeure pursuant to Section 24.13 below and/or Tenant Delays, then Landlord shall abate one (1) day of Base Rent for every one (1) day of
delay that Landlord fails to tender possession of the Premises to Tenant with Landlord’s Work Substantially Completed beyond the Outside
Delivery  Date  (as  may  be  so  extended),  provided  that  the  Lease  Commencement  Date  has  not  occurred  pursuant  to  Section  7.2(i)  of  the
Summary. The abatement right afforded to Tenant under this Section 1.2.2 shall be Tenant's sole and exclusive remedy for Landlord's failure
to tender possession of the Premises to Tenant with Landlord’s Work Substantially Completed on or before the Outside Delivery Date, as it
may be extended as provided hereinabove.

1.3

Rentable  Square  Feet.  The  rentable  square  feet  of  the  Premises  is  approximately  as  set  forth  in  Section  6.1  of  the
Summary.  For  purposes  hereof,  the  rentable  square  feet  of  the  Premises  and  the  Building  shall  be  calculated  by  Landlord  pursuant  to  the
Standard  Method  for  Measuring  Floor  Area  in  Office  Buildings,  ANSI  Z65.1-2017  ("BOMA"),  as  modified  for  the  Building  pursuant  to
Landlord's standard rentable area measurements for the Building. The rentable square feet of the Premises and the Building are subject to re-
measurement from time to time by Landlord's planner/designer and such re- measurements shall be made in accordance with the provisions
of  this  Section 1.3;  provided,  however,  the  rentable  square  feet  of  the  Premises  shall  only  be  subject  to  re-measurement  in  the  event  of  a
physical increase or decrease in the size of the Premises. Tenant's architect may consult with Landlord's planner/designer regarding such re-
measurements, except to the extent it relates to the rentable square feet of the Building; provided, however, the determination of Landlord's
planner/designer shall be conclusive and binding upon the parties. If Landlord's planner/designer determines that the rentable square footage
amounts shall be different from those set forth in this Lease, all amounts, percentages and figures appearing or referred to in this Lease based
upon such different rentable square footage (including, without limitation, the amount of the Base Rent and Tenant's Share) shall be modified
in accordance with such determination. If such determination is made, it will be confirmed in writing by Landlord to Tenant.

ARTICLE 2

LEASE TERM

The terms and provisions of this Lease shall be effective as of the date of execution of this Lease. The term of this Lease (the
"Lease Term") shall be as set forth in Section 7.1 of the Summary and shall commence on the date (the "Lease Commencement Date") set
forth in Section 7.2 of the Summary, and shall terminate on the date (the "Lease Expiration Date") set forth in Section 7.3 of the Summary,
unless this Lease is sooner terminated as hereinafter provided. For purposes of this Lease, the term "Lease Year" shall mean each consecutive
twelve  (12)  month  period  during  the  Lease  Term;  provided,  however,  that  the  first  (1st)  Lease  Year  shall  commence  on  the  Lease
Commencement Date and the last Lease Year shall end on the Lease Expiration Date. Following the Lease Commencement Date, Landlord
shall deliver to Tenant an amendment to lease in the form attached hereto as Exhibit C, setting forth the Lease Commencement Date and the
Lease Expiration Date, and Tenant shall execute and return such amendment to Landlord within five (5) business days after Tenant's receipt
thereof.

ARTICLE 3

BASE RENT

3.1

Base Rent. Tenant shall pay, without notice or demand, to Landlord at such place as Landlord may from time to time
designate  in  writing,  in  currency  or  a  check  for  currency  which,  at  the  time  of  payment,  is  legal  tender  for  private  or  public  debts  in  the
United States of America, base rent ("Base Rent") as set forth in Section 8 of the Summary, payable in equal monthly installments as set forth
in Section 8 of the Summary in advance on or before the first (1st) day of each and every calendar month during the Lease Term, without any
setoff or deduction whatsoever. At Landlord’s option, upon prior written notice to Tenant, all Rent shall be paid to Landlord electronically via
wire transfer or other direct deposit method and copies of all such electronic payments shall be provided to the Landlord on a monthly basis.
The Base Rent for the fifth (5th) full calendar month of the Lease Term shall be paid at the time of Tenant's execution of this Lease. If any
rental  payment  date  (including  the  Lease  Commencement  Date)  falls  on  a  day  of  a  calendar  month  other  than  the  first  (1st)  day  of  such
calendar month or if any Rent payment is for a period which is shorter than one calendar month (such as during the last month of the Lease
Term), the Rent for any fractional calendar month shall be the proportionate amount of a full calendar month's rental based on the proportion
that  the  number  of  days  in  such  fractional  month  bears  to  the  number  of  days  in  the  calendar  month  during  which  such  fractional  month
occurs. All other payments or adjustments required to be made under the terms of this Lease that require proration on a time basis shall be
prorated on the same basis.

-4-

 
3.2

Abatement of Base Rent. Notwithstanding anything to the contrary contained herein and provided that Tenant is not in
default under this Lease, Landlord hereby agrees to abate Tenant's obligation to pay the monthly installments of Base Rent otherwise payable
by Tenant for the Premises (collectively, the "Abated Rent") during the first four (4) full calendar months of the Lease Term (collectively, the
"Abatement Period") (for a total abatement of Base Rent equal to $70,531.20). During the Abatement Period, Tenant shall remain responsible
for the payment of all of its other monetary obligations under this Lease. In the event of a default by Tenant under the terms of this Lease that
results in the early termination of this Lease pursuant to the provisions of Article 19 below, then as a part of the recovery set forth in Article
19 below, Landlord shall be entitled to recover the unamortized portion of the Abated Rent. For purposes of this Section 3.2, the Abated Rent
shall be amortized on a straight-line basis over the scheduled forty-eight (48)-month Lease Term, and the unamortized balance thereof shall
be determined based upon the unexpired portion of such Lease Term.

ARTICLE 4

ADDITIONAL RENT

4.1

Additional Rent. In addition to paying the Base Rent specified in Article 3 above, Tenant shall pay as additional rent
the sum of the following: (i) Tenant's Share of the annual Operating Expenses allocated to the Building (pursuant to Section 4.3.4 below) for
each Expense Year which are in excess of the amount of Operating Expenses allocated to the Building during the Base Year (as such terms
are  defined  below);  plus  (ii)  Tenant's  Share  of  the  annual  Tax  Expenses  (as  defined  below)  allocated  to  the  Building  (pursuant  to  Section
4.3.4 below) for each Expense Year which are in excess of the Tax Expenses allocated to the Building during the Base Year. Such additional
rent, together with any and all other amounts payable by Tenant to Landlord hereunder pursuant to the terms of this Lease (other than the
Base Rent), shall be deemed additional rent, and hereinafter collectively referred to as the "Additional Rent." The Base Rent and Additional
Rent are herein collectively referred to as the "Rent." All amounts due under this Article 4 as Additional Rent shall be payable in the same
manner, time and place as the Base Rent, except as otherwise expressly set forth in this Article 4. Without limitation on other obligations of
Tenant which shall survive the expiration of the Lease Term, the obligations of Tenant to pay the Additional Rent provided for in this Article
4 shall survive the expiration of the Lease Term.

4.2

Definitions. As used in this Article 4, the following terms shall have the meanings hereinafter set forth:

4.2.1

4.2.2

"Base Year" shall mean the year set forth in Section 9.1 of the Summary.

"Expense Year" shall mean each calendar year, including the Base Year, in which any portion of the Lease

Term falls, through and including the calendar year in which the Lease Term expires.

4.2.3

"Operating  Expenses"  shall  mean  all  expenses,  costs  and  amounts  of  every  kind  and  nature  which
Landlord  shall  pay  or  incur  during  any  Expense  Year  because  of  or  in  connection  with  the  ownership,  management,  maintenance,  repair,
restoration or operation of the Project, including, without limitation, any amounts paid or incurred for: (i) the cost of supplying all utilities
(including,  without  limitation,  any  telephone  risers  or  intra  building  network  cabling),  the  cost  of  janitorial  service,  alarm  and  security
service,  window  cleaning,  and  trash  removal,  the  cost  of  operating,  maintaining,  repairing,  replacing,  renovating  and  managing  the  utility
systems, mechanical systems, sanitary and storm drainage systems, and escalator and elevator systems, and the cost of supplies, tools, and
equipment and maintenance and service contracts in connection therewith; (ii) the cost of licenses, certificates, permits and inspections and
the  cost  of  contesting  the  validity  or  applicability  of  any  governmental  enactments  which  may  affect  Operating  Expenses,  and  the  costs
incurred in connection with the implementation and operation of a transportation system management program or similar program; (iii) the
cost of insurance carried by Landlord in connection with the Project (including, without limitation, general or other liability insurance), in
such amounts as Landlord may reasonably determine, or as may be required by any mortgagees of any mortgage, or the lessor of any ground
lease affecting the Project; (iv) the cost of landscaping, relamping, supplies, tools, equipment (including equipment rental agreements) and
materials,  and  all  fees,  charges  and  other  costs,  including  management  fees  (or  amounts  in  lieu  thereof),  consulting  fees,  legal  fees  and
accounting fees, incurred in connection with the management, operation, administration, maintenance and repair of the Project; (v) the cost of
parking area repair, restoration and maintenance, including, but not limited to, resurfacing, repainting, restriping, and cleaning; (vi) wages,
salaries and other compensation and benefits of all persons engaged in the operation, management, maintenance or security of the Project
(excluding  compensation  (including  benefits)  of  any  employee  of  Landlord  above  the  grade  of  Project  manager  or  Project  engineer),  and
employer's  Social  Security  taxes,  unemployment  taxes  or  insurance,  and  any  other  taxes  which  may  be  levied  on  such  wages,  salaries,
compensation and benefits; (vii) payments under any easement, license, operating agreement, declaration, restrictive covenant, or instrument
pertaining to the sharing of costs by the Project; (viii) amortization (including interest on the unamortized cost at a rate equal to ten percent
(10%) per annum (the

-5-

 
"Amortization  Interest  Rate"))  of  the  cost  of acquiring  or  the  rental  expense  of  personal  property  used  in  the  maintenance,  operation  and
repair  of  the  Project;  (ix)  the  cost  (including  fair  market  rent)  of  Landlord's  property  management  office  for  the  Project  and  all  utilities,
supplies  and  materials  used  in  connection  therewith;  and  (x)  the  cost  of  any  capital  alterations,  capital  additions,  or  capital  improvements
made to the Project or any portion thereof (A) which are deemed reasonably necessary by Landlord to maintain the quality, integrity and/or
character  of  the  Project  and  all  systems,  equipment  and/or  facilities  which  serve  the  Project  (including  replacement  of  wall  and  floor
coverings,  ceiling  tiles  and  fixtures  in  lobbies,  corridors,  restrooms  and  other  common  or  public  areas  or  facilities,  maintenance  and
replacement  of  curbs,  walkways  and  parking  areas),  (B)  which  are  intended  as  a  labor-saving  device  or  to  effect  other  economies  in  the
operation or maintenance of the Project, or any portion thereof, or (C) that are required under any governmental law or regulation that is then
being  enforced  by  a  federal,  state  or  local  governmental  agency  from  and  after  the  Possession  Date;  provided,  however,  that  each  such
permitted capital expenditure shall be amortized (including interest on the unamortized cost at the Amortization Interest Rate in effect at the
time such expenditure is placed in service) over the shorter of (I) its useful life as Landlord shall reasonably determine, in accordance with
standard  real  estate  accounting  principles  consistently  applied,  (II)  the  period  during  which  the  reasonably  estimated  savings  in  Operating
Expenses equals the expenditures, or (III) three (3) years.

If during any Expense Year (including the Base Year) Landlord is not furnishing any particular work or service (the cost
of which, if performed or provided by Landlord, would be included in Operating Expenses) to a tenant who has undertaken to perform such
work or service in lieu of the performance thereof by Landlord, Operating Expenses shall be deemed to be increased by an amount equal to
the additional Operating Expenses which would reasonably have been incurred during such period by Landlord if it had at its own expense
furnished such work or service to such tenant. If the Building, Additional Buildings and/or any other office buildings located in the Project
are less than 95% occupied during all or a portion of any Expense Year, including the Base Year (including, without limitation, if any portion
of the Building is unleased or is leased, but is not then being used by a tenant in the ordinary course of its business), Landlord shall make an
appropriate adjustment to the variable components of Operating Expenses that vary based on occupancy for such Expense Year (including the
Base  Year)  as  reasonably  determined  by  Landlord  employing  sound  accounting  and  management  principles,  to  determine  the  amount  of
Operating Expenses that would have been paid had the Building, the Additional Buildings and/or any other office buildings located in the
Project been 95% occupied, and the amount so determined shall be deemed to have been the amount of Operating Expenses for such Expense
Year.  For  purposes  hereof,  cost  savings  in  components  of  Operating  Expenses  arising  by  reason  of  the  cessation  of  use  by  tenants  at  the
Building due to Casualty (as that term is defined in Section 11.1 below), Force Majeure (as that term is defined in Section 24.13 below), or
other  extraordinary  circumstances  are  considered  variable  Operating  Expenses  that  may  be  grossed  up  in  Operating  Expenses  during  any
Expense Year. Landlord shall not (x) make a profit by charging items to Operating Expenses that are otherwise also charged separately to
others,  or  (y)  collect  Operating  Expenses  from  Tenant  and  all  other  tenants/occupants  in  the  Building  in  an  amount  in  excess  of  what
Landlord incurred for the items included in Operating Expenses.

Landlord shall have the right, from time to time, to equitably allocate and prorate some or all of the Operating Expenses
among different tenants and/or buildings of the Project (the "Cost Pools"). Such Cost Pools may include, without limitation, the office space
tenants and retail space tenants, if any, of the Project, and allocation of those Operating Expenses attributable solely to a specific building in
the Project to that building.

If  Operating  Expenses  for  the  Base  Year,  include  amortized  costs,  or  costs  (including,  but  not  limited  to,  costs  of
insurance, personnel, and increased or new services) relating to extraordinary circumstances, including, but not limited to, Casualty, Force
Majeure,  conservation  surcharges,  boycotts,  embargoes  or  other  shortages,  then  at  such  time  as  such  costs  are  no  longer  applicable,  the
increased Operating Expenses attributable thereto shall be excluded from the Operating Expenses for the Base Year.

Notwithstanding the foregoing, for purposes of this Lease, Operating Expenses shall not, however, include: (1) except
as otherwise set forth above in this Section 4.2.3, interest on debt and amortization on mortgages; (2) ground lease payments; (3) costs of
leasing  commissions,  attorneys'  fees  and  other  costs  and  expenses  incurred  in  connection  with  negotiations  or  disputes  with  present  or
prospective tenants or other occupants of the Project; (4) the cost of providing any service directly to and paid directly by any tenant; (5) any
costs  expressly  excluded  from  Operating  Expenses  elsewhere  in  this  Lease;  (6)  costs  of  any  items  to  the  extent  Landlord  receives
reimbursement from insurance proceeds (such proceeds to be excluded from Operating Expenses in the year in which received, except that
any deductible amount under any insurance policy shall be included within Operating Expenses) or from a third party; (7) costs, including
permit,  license  and  inspection  costs,  incurred  in  renovating  or  otherwise  improving,  decorating,  or  redecorating  rentable  space  (including
vacant rentable space) for tenants or other occupants in the Project; (8) tax penalties incurred as a result of Landlord's negligence, inability or
unwillingness to make payments or file returns when due; (9) costs arising from Landlord's charitable or political contributions; (10) costs
incurred due to the violation by Landlord of the terms and conditions of

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any lease of space in the Project; (11) expenses which relate to the preparation of rental space for a tenant; (12) reserves for bad debts or for
future  improvements,  repairs,  additions,  etc.;  (13)  costs  (including,  without  limitation,  fines,  penalties,  interest,  and  costs  of  repairs,
replacements, alterations and/or improvements) incurred in bringing the Project into compliance with laws in effect as of the Possession Date
and as interpreted by applicable governmental authorities as of such date, including, without limitation, any costs to correct building code
violations pertaining to the initial design or construction of the Building, the Parking Facilities or any other improvements to the Project, to
the extent such violations exist as of the Possession Date under any applicable laws in effect and as interpreted by applicable governmental
authorities as of such date; (14) tax penalties incurred as a result of Landlord's negligence, inability or unwillingness to make payments when
due  or  to  file  any  income  tax  or  informational  returns  when  due;  (15)  costs  and  overhead  and  profit  increment  paid  to  Landlord  or  to
subsidiaries or affiliates of Landlord for goods and/or services in or to the Project to the extent the same exceeds typical costs and overhead
and  profit  increment  of  such  goods  and/or  services  rendered  by  qualified  unaffiliated  third  parties  on  a  competitive  basis;  (16)  costs  of
acquisition of sculptures, painting and other objects of art; (17) advertising and promotional expenditures; (18) costs incurred to comply with
applicable laws with respect to the cleanup, removal, investigation and/or remediation of any Hazardous Materials (as defined below) in, on
or under the Project and/or the Building to the extent such Hazardous Materials are: (a) in existence as of the Possession Date and in violation
of applicable laws in effect as of the Possession Date; or (b) introduced onto the Project and/or the Building after the Possession Date by
Landlord  or  any  of  Landlord's  agents,  employees,  contractors  or  other  tenants  in  violation  of  applicable  laws  in  effect  at  the  date  of
introduction;  (19)  costs  of  items  considered  capital  improvements,  capital  repairs,  capital  replacements,  and/or  capital  equipment,  all  as
determined in accordance with standard real estate accounting practices, except as specifically permitted in Sections 4.2.3(viii) and (x) above;
(20)  costs,  including  penalties,  fines  and  associated  legal  expenses,  incurred  due  to  the  violation  by  Landlord  or  any  other  tenant  in  the
Project of applicable laws, that would not have been incurred but for any such violations by Landlord or any tenant in the Project; or (21)
attorneys' fees incurred in connection with the Project (including, without limitation, any financing, sale or syndication of the Project), except
(A) as specifically enumerated as an Operating Expense in this Lease or (B) to the extent the expenditure of such attorneys' fees generally
benefits the tenants of the Project.

4.2.4

"Tax  Expenses"  shall  mean  all  federal,  state,  county,  or  local  governmental  or  municipal  taxes,  fees,
assessments, charges or other impositions of every kind and nature, whether general, special, ordinary or extraordinary (including, without
limitation, real estate taxes, general and special assessments, transit assessment fees and taxes, business or license taxes or fees, annual or
periodic license or use fees, open space charges, housing fund assessments, leasehold taxes or taxes based upon the receipt of rent, including
gross  receipts  or  sales  taxes  applicable  to  the  receipt  of  rent,  personal  property  taxes  imposed  upon  the  fixtures,  machinery,  equipment,
apparatus, systems and equipment, appurtenances, furniture and other personal property used in connection with the Project), which Landlord
shall pay or incur during any Expense Year because of or in connection with the ownership, leasing and operation of the Project or Landlord's
interest therein. For purposes of this Lease, Tax Expenses shall be calculated as if the tenant improvements in the Building and the Additional
Buildings  were  fully  constructed  and  the  Building  and  the  Additional  Buildings  and  all  tenant  improvements  in  the  Building  and  the
Additional Buildings were fully assessed for real estate tax purposes. When calculating Tax Expenses for the Base Year, Tax Expenses shall
exclude any category of real property taxes imposed during the Base Year that is not imposed in a subsequent Expense Year.

4.2.4.1

Tax Expenses shall include, without limitation:

(i)

any  assessment,  tax,  fee,  levy  or  charge  in  addition  to,  or  in  substitution,  partially  or
totally, of any assessment, tax, fee, levy or charge previously included within the definition of real property tax, it being acknowledged by
Tenant and Landlord that Proposition 13 was adopted by the voters of the State of California in the June 1978 election ("Proposition 13") and
that  assessments,  taxes,  fees,  levies  and  charges  may  be  imposed  by  governmental  agencies  for  such  services  as  fire  protection,  street,
sidewalk  and  road  maintenance,  conservation,  refuse  removal  and  for  other  governmental  services  formerly  provided  without  charge  to
property owners or occupants, and, in further recognition of the decrease in the level and quality of governmental services and amenities as a
result  of  Proposition  13,  Tax  Expenses  shall  also  include  any  governmental  or  private  assessments  or  the  Project's  contribution  towards  a
governmental or private cost-sharing agreement for the purpose of augmenting or improving the quality of services and amenities normally
provided by governmental agencies. It is the intention of Tenant and Landlord that all such new and increased assessments, taxes, fees, levies,
and charges and all similar assessments, taxes, fees, levies and charges be included within the definition of Tax Expenses for purposes of this
Lease;

any  assessment,  tax,  fee,  levy,  or  charge  allocable  to  or  measured  by  the  area  of  the
Premises or the Rent payable hereunder, including, without limitation, any gross receipts with respect to the receipt of such Rent, and/or any
tax upon or with respect to the possession, leasing, operating, management, maintenance, alteration, repair, use or occupancy by Tenant of the
Premises, or any portion thereof;

(ii)

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(iii)
which Tenant is a party, creating or transferring an interest or an estate in the Premises; and

any  assessment,  tax,  fee,  levy  or  charge,  upon  this  transaction  or  any  document  to

Expenses.

(iv)

any expenses incurred by Landlord in attempting to protest, reduce or minimize Tax

4.2.4.2

Notwithstanding  anything  to  the  contrary  contained  in  this  Section  4.2.4,  there  shall  be
excluded  from  Tax  Expenses  (i)  all  excess  profits  taxes,  franchise  taxes,  gift  taxes,  capital  stock  taxes,  inheritance  and  succession  taxes,
estate taxes, federal and state income taxes, and other taxes to the extent applicable to Landlord's general or net income (as opposed to rents,
receipts  or  income  attributable  to  operations  at  the  Project),  (ii)  any  items  paid  by  Tenant  under  Section 4.4  below,  and  (iii)  tax  penalties
incurred  as  a  result  of  Landlord's  negligence,  inability  or  unwillingness  to  make  payments  when  due  or  to  file  any  income  tax  or
informational returns when due.

4.2.4.3

Notwithstanding anything to the contrary set forth in this Lease, the amount of Tax Expenses
for  the  Base  Year  and  any  Expense  Year  shall  be  calculated  without  taking  into  account  any  decreases  in  real  estate  taxes  obtained  in
connection with Proposition 8, and, therefore, the Tax Expenses in the Base Year and/or an Expense Year may be greater than those actually
incurred by Landlord, but shall, nonetheless, be the Tax Expenses due under this Lease; provided that (i) any costs and expenses incurred by
Landlord in securing any Proposition 8 reduction shall not be included in Operating Expenses for purposes of this Lease, and (ii) tax refunds
under  Proposition  8  shall  not  be  deducted  from  Tax  Expenses,  but  rather  shall  be  the  sole  property  of  Landlord.  Landlord  and  Tenant
acknowledge that this Section 4.2.4.3 is not intended to in any way affect (A) the inclusion in Tax Expenses of any annual increases in Tax
Expenses pursuant to applicable laws, or (B) the inclusion or exclusion of Tax Expenses pursuant to the terms of Proposition 13.

4.2.5

"Tenant's Share" shall mean the percentage set forth in Section 9.2 of the Summary. Tenant's Share was
calculated by dividing the number of rentable square feet of the Premises by the total rentable square feet in the Building. Landlord shall have
the  right  from  time  to  time  to  redetermine  the  rentable  square  feet  of  the  Premises  and/or  the  Building,  and  Tenant's  Share  shall  be
appropriately adjusted to reflect any such determination; provided, however, the rentable square feet of the Premises shall only be subject to
re-measurement  in  the  event  of  a  physical  increase  or  decrease  in  the  size  of  the  Premises.  If  Tenant's  Share  is  adjusted  pursuant  to  the
foregoing, then, as to the Expense Year in which such adjustment occurs, Tenant's Share for such year shall be determined on the basis of the
number of days during such Expense Year that each such Tenant's Share was in effect.

4.3

Calculation and Payment of Additional Rent.

4.3.1

Calculation of Excess. If for any Expense Year ending or commencing within the Lease Term, (i) Tenant's
Share of Operating Expenses allocated to the Building (pursuant to Section 4.3.4 below) for such Expense Year exceeds Tenant's Share of the
Operating  Expenses  allocated  to  the  Building  for  the  Base  Year,  and/or  (ii)  Tenant's  Share  of  Tax  Expenses  allocated  to  the  Building
(pursuant to Section 4.3.4 below) for such Expense Year exceeds Tenant's Share of the Tax Expenses allocated to the Building for the Base
Year then Tenant shall pay to Landlord, in the manner set forth in Section 4.3.2,  below,  and  as  Additional  Rent,  an  amount  equal  to  such
excess (the "Excess").

4.3.2

Statement of Actual Expenses and Payment by Tenant.  Within  one  hundred  twenty  (120)  days  after  the
end of each Expense Year, Landlord shall use commercially reasonable efforts to give Tenant a statement (the "Statement"), which shall state
the  Operating  Expenses  and  Tax  Expenses  that  were  incurred  or  accrued  for  such  preceding  Expense  Year  and  allocated  to  the  Building
(pursuant to Section 4.3.4 below), and which shall indicate the amount, if any, of any Excess. Within thirty (30) days after Tenant's receipt of
the  Statement  for  each  Expense  Year  ending  during  the  Lease  Term,  Tenant  shall  pay  to  Landlord  the  full  amount  of  the  Excess  for  such
Expense  Year,  less  the  amounts,  if  any,  paid  during  such  Expense  Year  as  Estimated  Excess  (as  defined  in  and  pursuant  to  Section 4.3.3,
below). If any Statement reflects that the amount of Estimated Excess paid by Tenant to Landlord for such Expense Year is greater than the
actual amount of the Excess for such Expense Year, then Landlord shall, at Landlord's option, either (i) remit such overpayment to Tenant
within thirty (30) days after such applicable Statements is delivered to Tenant, or (ii) credit such overpayment toward the Additional Rent
next  due  and  payable  to  Tenant  under  this  Lease.  The  failure  of  Landlord  to  timely  furnish  the  Statement  for  any  Expense  Year  shall  not
prejudice Landlord from enforcing its rights under this Article 4; provided, however, Landlord's failure to provide Tenant with a Statement
for  a  particular  Expense  Year  within  eighteen  (18)  months  after  the  end  of  the  Expense  Year  in  question  shall  constitute  a  waiver  of
Landlord's right to collect any additional Operating Expenses and Tax Expenses payable for such Expense Year that would be disclosed by
such Statement. Notwithstanding the foregoing, such limitation on Landlord's ability to collect any Operating Expenses and Tax Expenses as
a  result  of  any  late  delivery  of  such  Statement  shall  not  preclude  Landlord  from  modifying  any  Statement  once  such  Statement  is  timely
delivered, as provided hereinabove, to reflect any additional expenses levied by any governmental

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authority  or  by  any  public  utility  companies  (including, without  limitation,  as  a  result  of  any  new  or  supplemental  tax  bills  issued  by  the
applicable taxing authority). Even though the Lease Term has expired and Tenant has vacated the Premises, if the Statement for the Expense
Year in which this Lease terminates reflects that Tenant's payment to Landlord of Estimated Excess for such Expense Year was greater than
or less than the actual amount of Excess for such last Expense Year, then within thirty (30) days after Landlord's delivery of such Statement
to Tenant, Landlord shall refund to Tenant any such overpayment, or Tenant shall pay to Landlord any such underpayment, as the case may
be. The provisions of this Section 4.3.2 shall survive the expiration or earlier termination of the Lease Term.

4.3.3

Statement  of  Estimated  Expenses.  Prior  to  each  Expense  Year,  Landlord  shall  give  Tenant  a  yearly
expense estimate statement (the "Estimate Statement") which shall set forth Landlord's reasonable estimate (the "Estimate") of what the total
amount of Operating Expenses and Tax Expenses allocated to the Building (pursuant to Section 4.3.4 below) for the then-current Expense
Year  shall  be  and  the  estimated  Excess  (the  "Estimated  Excess")  as  calculated  by  comparing  (i)  Tenant's  Share  of  Operating  Expenses
allocated to the Building (pursuant to Section 4.3.4 below) for such then-current Expense Year, which shall be based upon the Estimate, to
Tenant's Share of Operating Expenses allocated to the Building for the Base Year, and (ii) Tenant's Share of Tax Expenses allocated to the
Building (pursuant to Section 4.3.4 below) for such then-current Expense Year, which shall be based upon the Estimate, to Tenant's Share of
Tax Expenses allocated to the Building for the Base Year, which Estimate Statement may be revised and reissued by Landlord from time to
time; provided, however, to the extent Landlord fails to deliver an Estimate Statement for such then-current Expense Year, Tenant shall pay
the Estimated Excess for such then-current Expense Year in accordance with the previous Estimate Statement (if any) given by Landlord for
the  previous  Expense  Year.  The  failure  of  Landlord  to  timely  furnish  the  Estimate  Statement  for  any  Expense  Year  shall  not  preclude
Landlord from enforcing its rights to collect any Estimated Excess under this Article 4. If pursuant to the Estimate Statement (or a revision
thereof) an Estimated Excess is calculated for the then-current Expense Year, Tenant shall pay, with its next installment of Base Rent due, but
in  no  event  later  than  thirty  (30)  days  after  receipt  of  such  Estimate  Statement,  a  fraction  of  the  Estimated  Excess  (or  the  increase  in  the
Estimated Excess if pursuant to a revised Estimate Statement) for the then-current Expense Year (reduced by any amounts paid pursuant to
the last sentence of this Section 4.3.3). Such fraction shall have as its numerator the number of months which have elapsed in such current
Expense  Year  to  the  month  of  such  payment,  both  months  inclusive,  and  shall  have  twelve  (12)  as  its  denominator.  Until  a  new  Estimate
Statement is furnished, Tenant shall pay monthly, with the monthly Base Rent installments, an amount equal to one-twelfth (1/12) of the total
Estimated Excess set forth in the previous Estimate Statement delivered by Landlord to Tenant.

4.3.4

Allocation  of  Operating  Expenses  and  Tax  Expenses  to  Building.  The  parties  acknowledge  that  the
Building  is  part  of  a  multi-building  project,  and  that  the  costs  and  expenses  incurred  in  connection  with  the  Project  (i.e.,  the  Operating
Expenses and Tax Expenses) are determined annually for the Project as a whole but then allocated by Landlord among (i) the tenants of the
Building, (ii) the tenants of the Additional Buildings, and (iii) if and when other buildings are constructed on the Project and are in operation,
the tenants of such other buildings, for purposes of determining such tenants' shares of Operating Expenses and Tax Expenses. In making
such  allocation  of  Operating  Expenses  and  Tax  Expenses  for  purposes  of  determining  Tenant's  Share  of  Operating  Expenses  and  Tax
Expenses,  Operating  Expenses  and  Tax  Expenses  shall  be  allocated  as  follows:  the  portion  of  Operating  Expenses  and  Tax  Expenses
allocated to the tenants of the Building shall consist of (A) all Operating Expenses and Tax Expenses attributable solely to the Building, and
(B) an equitable portion (as determined by Landlord in accordance with standard real estate accounting principles consistently applied) of the
Operating  Expenses  and  Tax  Expenses  attributable  to  the  Project  as  a  whole  and  not  attributable  solely  to  the  Building,  the  Additional
Buildings or to any other buildings of the Project.

4.4

Taxes and Other Charges for Which Tenant Is Directly Responsible.  Tenant  shall  reimburse  Landlord,  as  Additional
Rent, within thirty (30) days after demand, for all taxes and assessments required to be paid by Landlord (except to the extent included in Tax
Expenses by Landlord), excluding state, local and federal personal or corporate income taxes measured by the net income of Landlord from
all sources and estate and inheritance taxes, whether or not now customary or within the contemplation of the parties hereto, when:

4.4.1

said taxes are measured by or reasonably attributable to the cost or value of Tenant's equipment, furniture,
fixtures  and  other  personal  property  located  in  the  Premises,  or  by  the  cost  or  value  of  any  leasehold  improvements  made  in  or  to  the
Premises by or for Tenant, to the extent the cost or value of such leasehold improvements exceeds the cost or value of a building standard
build-out as determined by Landlord regardless of whether title to such improvements shall be vested in Tenant or Landlord;

maintenance, alteration, repair, use or occupancy by Tenant of the Premises or any portion of the Project; or

4.4.2

said  taxes  are  assessed  upon  or  with  respect  to  the  possession,  leasing,  operation,  management,

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transferring an interest or an estate in the Premises.

4.4.3

said  taxes  are  assessed  upon  this  transaction  or  any  document  to  which  Tenant  is  a  party  creating  or

4.5

Late  Charges.  If  any  installment  of  Rent  or  any  other  sum  due  from  Tenant  shall  not  be  received  by  Landlord  or
Landlord's designee by the due date therefor, then Tenant shall pay to Landlord a late charge equal to five percent (5%) of the amount due
plus any attorneys' fees incurred by Landlord by reason of Tenant's failure to pay Rent and/or other charges when due hereunder. The late
charge  shall  be  deemed  Additional  Rent  and  the  right  to  require  it  shall  be  in  addition  to  all  of  Landlord's  other  rights  and  remedies
hereunder,  at  law  and/or  in  equity  and  shall  not  be  construed  as  liquidated  damages  or  as  limiting  Landlord's  remedies  in  any  manner.  In
addition to the late charge described above, any Rent or other amounts owing hereunder which are not paid by the date that they are due shall
thereafter bear interest until paid at a rate equal to the lesser of (i) twelve percent (12%) per annum, and (ii) the highest rate permitted by
applicable law (the “Interest Rate”).

4.6

Audit Right. If Tenant disputes the amount of the Operating Expenses and/or Tax Expenses set forth in the Statement
for any particular Expense Year delivered by Landlord to Tenant pursuant to Section 4.3.2 above, then Tenant shall have the right, at Tenant's
cost,  upon  thirty  (30)  days'  prior  written  notice  to  Landlord,  to  have  Tenant's  authorized  employees  inspect,  at  Landlord's  offices  during
normal business hours, Landlord's books, records and supporting documents concerning the Operating Expenses and Tax Expenses set forth
in such Statement; provided, however, Tenant shall have no right to conduct such inspection, have an audit performed by the Accountant (as
defined and described hereinbelow), or object to or otherwise dispute the amount of the Operating Expenses and Tax Expenses set forth in
any  such  Statement  unless  Tenant  notifies  Landlord  of  such  objection  and  dispute,  completes  such  inspection,  and  has  the  Accountant
commence  and  complete  such  audit  within  twelve  (12)  months  immediately  following  Landlord's  delivery  of  the  particular  Statement  in
question (the "Review Period"); provided, further, that notwithstanding any such timely objection, dispute, inspection, and/or audit, and as a
condition precedent to Tenant's exercise of its right of objection, dispute, inspection and/or audit as set forth in this Section 4.6, Tenant shall
not  be  permitted  to  withhold  payment  of,  and  Tenant  shall  timely  pay  to  Landlord,  the  full  amounts  as  required  by  the  provisions  of  this
Article 4 in accordance with such Statement. However, such payment may be made under protest pending the outcome of any audit which
may be performed by the Accountant as described hereinbelow. In connection with any such inspection by Tenant, Landlord and Tenant shall
reasonably cooperate with each other so that such inspection can be performed pursuant to a mutually acceptable schedule, in an expeditious
manner and without undue interference with Landlord's operation and management of the Project. If after such inspection and/or request for
documentation, Tenant still disputes the amount of the Operating Expenses and Tax Expenses set forth in the Statement, then Tenant shall
have the right, within the Review Period, to cause a nationally recognized independent certified public accountant (which is not paid on a
commission or contingency basis and which has not been engaged by Tenant within the preceding five (5) year period) mutually approved by
Landlord and Tenant, which approval shall not be unreasonably withheld or delayed (the "Accountant") to complete an audit of Landlord's
books and records to determine the proper amount of the Operating Expenses and Tax Expenses incurred and amounts payable by Tenant for
the Expense Year which is the subject of such Statement. Such audit by the Accountant shall be final and binding upon Landlord and Tenant.
If Landlord and Tenant cannot mutually agree as to the identity of the Accountant within thirty (30) days after Tenant notifies Landlord that
Tenant desires an audit to be performed, then the Accountant shall be one of the "Big 4" accounting firms or another nationally recognized
accounting firm (which is not paid on a commission or contingency basis and which has not been engaged by Tenant within the preceding
five (5) year period), as selected by Tenant. If such audit reveals that Landlord has over- charged Tenant, then within thirty (30) days after the
results of such audit are made available to Landlord, Landlord shall reimburse to Tenant the amount of such over-charge. If the audit reveals
that  the  Tenant  was  under-charged,  then  within  thirty  (30)  days  after  the  results  of  such  audit  are  made  available  to  Tenant,  Tenant  shall
reimburse to Landlord the amount of such under-charge. Tenant agrees to pay the cost of such audit unless it is subsequently determined that
Landlord's original Statement that was the subject of such audit overstated Operating Expenses and Tax Expenses by ten percent (10%) or
more  of  the  actual  Operating  Expenses  and  Tax  Expenses  verified  by  such  audit,  in  which  case  Landlord  shall  reimburse  Tenant  for  the
reasonable cost of such audit (but not in excess of the amount of the Operating Expenses and Tax Expenses so overstated). The payment by
Tenant of any amounts pursuant to this Article 4 shall not preclude Tenant from questioning, during the Review Period, the correctness of the
particular Statement in question provided by Landlord, but the failure of Tenant to object thereto, conduct and complete its inspection and
have  the  Accountant  conduct  the  audit  as  described  above  prior  to  the  expiration  of  the  Review  Period  for  such  Statement  shall  be
conclusively deemed Tenant's approval of the Statement in question and the amount of Operating Expenses and Tax Expenses shown thereon.
In connection with any inspection and/or audit conducted by Tenant pursuant to this Section 4.6, Tenant agrees to keep, and to cause all of
Tenant's  employees  and  consultants  and  the  Accountant  to  keep,  all  of  Landlord's  books  and  records  and  the  audit,  and  all  information
pertaining thereto and the results thereof, strictly confidential, and in connection therewith, Tenant shall cause such employees, consultants
and  the  Accountant  to  execute  commercially  reasonable  confidentiality  agreements  as  Landlord  may  require  prior  to  conducting  any  such
inspections and/or audits.

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ARTICLE 5

USE OF PREMISES

5.1

Use.  Tenant  shall  use  the  Premises  solely  for  general,  executive  and  administrative  non-  medical  office  purposes
consistent with the character of the Project as a first-class office building project, and Tenant shall not use or permit the Premises to be used
for  any  other  purpose  or  purposes  whatsoever.  Tenant  shall,  at  its  sole  cost  and  expense,  obtain  all  governmental  licenses  and  permits
required to allow Tenant to conduct Tenant's permitted use. The population density within the Premises as a whole shall at no time exceed
one  person  for  each  250  rentable  square  feet  in  the  Premises.  Tenant  shall  not  use,  or  permit  any  of  Tenant's  employees,  agents,
representatives, contractors, invitees or licensees to use, the Premises or any part thereof for any use or purpose: (i) contrary to the Rules and
Regulations; or (ii) in violation of any applicable laws, including, without limitation, those with respect to Hazardous Materials; or (iii) which
would adversely affect or render more expensive (unless Tenant directly pays to Landlord the additional premium therefor) any fire or other
insurance  maintained  by  Landlord  for  the  Project  or  any  of  its  contents;  or  (iv)  which  would  impair  or  interfere  with  any  of  the  Building
systems and equipment or the janitorial, security and building maintenance services; or (v) which would impair or materially and adversely
interfere  with  the  structural  portions  of  the  Building  including,  without  limitation,  the  foundation,  floor/ceiling  slabs,  roof,  curtain  wall,
exterior  glass  and  mullions,  columns,  beams,  shafts  (including  elevator  shafts),  stairs,  Parking  Facilities,  stairwells,  elevator  cabs,  plazas,
washrooms, mechanical, electrical and telephone closets. Tenant shall comply with all recorded covenants, conditions, and restrictions, and
the provisions of all ground leases, now or hereafter affecting the Project and shall not at any time use or occupy or allow any person to use
or occupy the Premises or the Project or do or permit anything to be done or kept in the Premises or the Project in any manner which: (A)
violates any certificate of occupancy in force for the Premises, the Building or the Project; (B) causes or is likely to cause damage to the
Premises or the Project or any equipment, facilities or other systems therein; (C) results in repeated demonstrations, bomb threats or other
events  which  require  evacuation  of  the  Building  or  Project  or  otherwise  disrupt  the  use,  occupancy  or  quiet  enjoyment  of  the  Building  or
Project  by  other  tenants  and  occupants;  or  (D)  interferes  with  the  transmission  or  reception  of  microwave,  television,  radio  or  other
communications  signals  by  antennae  located  on  the  roof  of  the  Building  or  elsewhere  in  the  Building  or  Project.  Landlord  shall  not  be
responsible to Tenant for the nonperformance of any of Rules and Regulations by or otherwise with respect to the acts or omissions of any
other tenants or occupants of the Project.

5.2

Hazardous Materials.

5.2.1

General. Tenant shall not use or allow another person or entity to use any part of the Premises and Tenant
shall  not  use  any  part  of  the  Building  or  Project  for  the  storage,  use,  treatment,  manufacture  or  sale  of  Hazardous  Materials.  Landlord
acknowledges, however, that Tenant will maintain and use ordinary office products in the Premises which are incidental to the operation of
its  offices,  such  as  photocopy  supplies,  secretarial  supplies  and  limited  janitorial  supplies,  which  products  contain  chemicals  which  are
categorized as Hazardous Materials. Landlord agrees that the presence and use of reasonable amounts of such products in the Premises in
compliance with all applicable laws and in the manner in which such products are designed to be used shall not be a violation by Tenant of
this Section 5.2. Tenant shall immediately notify Landlord of any inquiry, test, investigation or enforcement proceeding by or against Tenant
or the Premises concerning the presence of any Hazardous Material. Tenant shall promptly commence and diligently complete all actions, at
its  sole  cost  and  expense,  as  are  necessary  to  return  the  Premises,  the  Building  and  the  Project  to  the  condition  existing  prior  to  the
introduction,  use  or  release  of  any  Hazardous  Materials  by  Tenant  or  the  contractors,  agents,  employees,  licensees  or  invitees  of  Tenant,
provided, however, (i) Landlord's approval of such actions shall first be obtained, and (ii) any investigation or remediation by or on Tenant's
behalf taken on or about the Premises or Project shall be conducted only by a consultant approved in writing by Landlord and pursuant to a
work  letter,  approved  in  writing  by  Landlord.  Tenant  shall  not  excavate,  disturb  or  conduct  any  testing  of  any  soils  or  groundwater  on  or
about the Premises or Project without obtaining Landlord's prior written consent. If Tenant shall fail to comply with the provisions of this
Section 5.2.1 within five (5) days after written notice by Landlord, or such shorter period of time as shall be required by applicable laws or in
order to minimize any hazard to persons or property, Landlord may (but shall not be obligated to) arrange for such compliance directly or as
Tenant's  agent  through  contractors  or  other  parties  selected  by  Landlord,  at  Tenant's  expense  (without  limiting  Landlord's  other  remedies
under this Lease or applicable laws). In addition, Tenant shall indemnify, defend, protect and hold harmless the Landlord Parties (as defined
below) from and against any and all Claims (as defined below) incurred in connection with or arising from violation of this Section 5.2 by
Tenant, or any person claiming by, through or under Tenant, or of the contractors, agents, employees, licensees or invitees of Tenant.

Acknowledgement of Notice Regarding Hazardous Materials Release. Tenant acknowledges that, prior to
entering into this Lease, Landlord notified Tenant pursuant to Health and Safety Code Section 25359.7 that hazardous substances had come
to be located beneath the Project.

5.2.2

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5.2.3

Definitions;  Survival.  As  used  herein,  the  term  "Hazardous  Materials"  means  any  hazardous  or  toxic
substance, material or waste which is or becomes regulated by any local governmental authority, the State of California or the United States
Government,  including,  without  limitation,  any  material  or  substance  which  is  (i)  defined  or  listed  as  a  "hazardous  waste,"  "extremely
hazardous waste," "restricted hazardous waste," "hazardous substance" or "hazardous material" under any applicable federal, state or local
law or administrative code promulgated thereunder, (ii) petroleum or petroleum-based chemicals or substances, (iii) asbestos, (iv) PCB, and
(v) urea formaldehyde. The provisions of this Section 5.2 shall survive the expiration or sooner termination of this Lease with respect to any
Claims in violation of this Section 5.2 occurring prior to such expiration or termination.

5.3

Asbestos. Tenant acknowledges that Landlord has advised Tenant that the Building contains or, because of its age, is
likely  to  contain,  asbestos.  Reports  indicate  that  such  asbestos  is  present  in  various  locations  throughout  the  Building.  Upon  request  by
Tenant, Landlord shall make available for review by Tenant at the Project during normal business hours (without warranty) copies of any
current  asbestos  management  plans,  inspection  reports,  test  results  or  other  similar  documents  in  Landlord’s  possession  relating  to  the
presence of asbestos at the Building. To the extent such reports or documents indicate the presence of asbestos at the Building, this Section
5.3 shall constitute notice to Tenant as required by the California Health & Safety Code. In connection with performing any work that may
disturb  asbestos  at  the  Building,  Tenant  shall  comply,  at  its  cost,  with  any  applicable  laws  and  asbestos  management  plans  relating  to  the
Building. Tenant shall also comply with all applicable laws, rules and regulations requiring disclosure to employees and/or invitees of the
presence of asbestos or other Hazardous Materials at or around the Premises, the Building or the Project. Landlord has no special knowledge
of the general procedures or handling restrictions to minimize or prevent the disturbance, release or exposure to asbestos or of the potential
health risks that may result from any exposure to asbestos. Tenant is encouraged to contact local or state public health agencies for further
information.

ARTICLE 6

SERVICES AND UTILITIES

6.1
otherwise stated below.

Standard  Tenant  Services.  Landlord  shall  provide  the  following  services  on  all  days  during  the  Lease  Term,  unless

6.1.1

Subject  to  all  governmental  rules,  regulations  and  guidelines  applicable  thereto,  Landlord  shall  provide
heating, ventilation and air conditioning ("HVAC") when necessary for normal comfort for normal office use in the Premises, from Monday
through Friday during the period from 7:00 a.m. to 6:00 p.m. (collectively, the "Building Hours"), except for the date of observation of New
Year's Day, Martin Luther King Day, Presidents Day, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day
and  any  other  nationally  and/or  locally  recognized  holidays  as  designated  by  Landlord  (collectively,  the  "Holidays").  Notwithstanding  the
foregoing, if during the Lease Term Landlord permits Tenant to install one (1) or more independent HVAC units (collectively, the "HVAC
Units") in the Premises pursuant to Article 8 below for Tenant's exclusive use within the Premises, then the electrical usage for the HVAC
Units shall be separately metered, at Tenant's sole cost and expense, and Tenant shall, within thirty (30) days after Tenant's receipt of invoice
therefor from Landlord, pay to Landlord or reimburse Landlord for the actual electrical costs charged by the entity providing electricity to the
HVAC Units. Tenant shall be responsible for repair and maintenance of the HVAC Units at Tenant's expense and, accordingly, Tenant shall,
throughout the Lease Term, maintain a service and/or maintenance contract for the HVAC Units, with a service provider reasonably approved
by Landlord, which service provider shall perform all maintenance and repair on the HVAC Units. Tenant shall provide to Landlord a copy of
periodic service reports for the HVAC Units, as such reports are received by Tenant.

6.1.2

Landlord shall provide adequate electrical wiring and facilities and power for normal general office use as
determined by Landlord. As part of Operating Expenses, Landlord shall replace lamps, starters and ballasts for Building standard lighting
fixtures  within  the  Premises.  Tenant  shall  bear  the  cost  of  replacement  of  lamps,  starters  and  ballasts  for  non-Building  standard  lighting
fixtures within the Premises.

purposes.

6.1.3

Landlord  shall  provide  city  water  from  the  regular  Building  outlets  for  drinking,  lavatory  and  toilet

Holidays, in and about the Premises.

6.1.4

Landlord  shall  provide  janitorial  services  five  (5)  days  per  week,  except  the  date  of  observation  of  the

Building Hours, and have one elevator available at all other times, including on the Holidays.

6.1.5

Landlord  shall  provide  nonexclusive,  non-attended  automatic  passenger  elevator  service  during  the

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6.1.6

Landlord shall provide nonexclusive freight elevator service subject to scheduling by Landlord.

6.2

Overstandard  Tenant  Use.  Tenant  shall  not,  without  Landlord's  prior  written  consent,  use  heat-generating  machines,
machines  other  than  normal  fractional  horsepower  office  machines,  or  equipment  or  lighting  other  than  building  standard  lights  in  the
Premises,  which  may  affect  the  temperature  otherwise  maintained  by  the  air  conditioning  system  or  increase  the  need  for  water  normally
furnished for the Premises by Landlord pursuant to the terms of Section 6.1 above. If Tenant uses water or HVAC in excess of that supplied
by Landlord pursuant to Section 6.1  above,  or  if  Tenant's  consumption  of  electricity  shall  exceed  an  average  of  three  (3)  watts  per  usable
square foot of the Premises, connected load, calculated on a monthly basis during the Building Hours set forth in Section 6.1.1 above, then
Tenant shall pay to Landlord, within ten (10) days after billing, the cost of such excess consumption, the cost of the installation, operation,
and maintenance of equipment which is installed in order to supply such excess consumption, and the cost of the increased wear and tear on
existing equipment caused by such excess consumption; and Landlord may install devices to separately meter any increased use and in such
event  Tenant  shall  pay  the  increased  cost  directly  to  Landlord,  within  ten  (10)  days  after  demand,  including  the  cost  of  such  additional
metering devices. If Tenant desires to use HVAC from other than the HVAC Units (if applicable) during hours other than the Building Hours,
(i)  Tenant  shall  give  Landlord  such  prior  notice,  as  Landlord  shall  from  time  to  time  establish  as  appropriate,  of  Tenant's  desired  use,  (ii)
Landlord shall supply such after- hours HVAC to Tenant at such hourly cost to Tenant as Landlord shall from time to time establish, and (iii)
Tenant shall pay such cost to Landlord within ten (10) days after billing as Additional Rent hereunder.

6.3

Interruption  of  Use.  Except  as  provided  in  Section  6.6  below,  Tenant  agrees  that  Landlord  shall  not  be  liable  for
damages,  by  abatement  of  Rent  or  otherwise,  for  failure  to  furnish  or  delay  in  furnishing  any  service  (including  telephone  and
telecommunication services), or for any diminution in the quality or quantity thereof, when such failure or delay or diminution is occasioned,
in whole or in part, by repairs, replacements, or improvements, by any strike, lockout or other labor trouble, by inability to secure electricity,
gas, water, or other fuel at the Building or Project after reasonable effort to do so, by any accident or Casualty whatsoever, by act or default
of Tenant or other parties, or by any other cause beyond Landlord's reasonable control; and such failures or delays or diminution shall never
be deemed to constitute an eviction or disturbance of Tenant's use and possession of the Premises or relieve Tenant from paying Rent (except
as provided in Section 6.6 below) or performing any of its obligations under this Lease. It is understood that any such condition may require
the  temporary  evacuation  or  closure  of  all  or  a  portion  of  the  Building  and  Project.  Furthermore,  Landlord  shall  not  be  liable  under  any
circumstances for a loss of, or injury to, property or for injury to, or interference with, Tenant's business, including, without limitation, loss of
profits, however occurring, through or in connection with or incidental to a failure to furnish any of the services or utilities as set forth in this
Article 6. Further, in the event any governmental authority or public utility promulgates or revises any law, ordinance, rule or regulation, or
issues mandatory controls or voluntary controls relating to the use or conservation of energy, water, gas, light or electricity, the reduction of
automobile  or  other  emissions,  or  the  provision  of  any  other  utility  or  service,  Landlord  may  take  any  reasonably  appropriate  action  to
comply with such law, ordinance, rule, regulation, mandatory control or voluntary guideline and Tenant’s obligations hereunder shall not be
affected  by  any  such  action  of  Landlord.  The  parties  acknowledge  that  safety  and  security  devices,  services  and  programs  provided  by
Landlord, if any, while intended to deter crime and ensure safety, may not in given instances prevent theft or other criminal acts, or ensure
safety of persons or property. The risk that any safety or security device, service or program may not be effective, or may malfunction, or be
circumvented by a criminal, is assumed by Tenant with respect to Tenant’s property and interests, and Tenant shall obtain insurance coverage
to  the  extent  Tenant  desires  protection  against  such  criminal  acts  and  other  losses,  as  further  described  in  this  Lease.  Tenant  agrees  to
cooperate in any reasonable safety or security program developed by Landlord or required by law.

6.4

Additional  Services.  Landlord  shall  also  have  the  exclusive  right,  but  not  the  obligation,  to  provide  any  additional
services which may be required by Tenant, including, without limitation, locksmithing, additional janitorial service, and additional repairs
and maintenance, provided that Tenant shall pay to Landlord, within ten (10) days after billing, and as Additional Rent hereunder, the sum of
all costs to Landlord of such additional services plus a ten percent (10%) administration fee.

6.5

Access to Building and Parking Facilities. Subject to the other provisions of this Lease (including, without limitation,
the  Rules  and  Regulations  and  any  modifications  thereof  adopted  by  Landlord  from  time  to  time),  Tenant  shall  be  granted  access  to  the
Building, the Premises, and the Parking Facilities twenty-four (24) hours per day, seven (7) days per week, every day of the year.

6.6

Abatement Event. If (i) Landlord fails to provide services required of Landlord under Sections 6.1  and/or  6.5 above,
and (ii) such failure causes all or a material portion of the Premises to be untenantable by Tenant and Tenant actually ceases to use all or a
material portion of the Premises, (iii) such failure is not the result of a Force Majeure event and is reasonably within Landlord's ability to
cure, and (iv) such failure is not the result of the acts and/or omissions of Tenant and/or its agents, contractors,

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employees, licensees or invitees, then in order to be entitled to receive the benefits of this Section 6.6, Tenant must give Landlord notice (the
"Initial  Notice"),  specifying  such  failure  to  perform  by  Landlord  (the  "Abatement  Event").  If  Landlord  has  not  commenced  to  cure  such
Abatement Event within three (3) business days after the receipt of the Initial Notice and is not otherwise excused from such performance by
this Lease, then prior to any abatement, Tenant must deliver an additional written notice to Landlord (the "Additional Notice"), specifying
such Abatement Event and Tenant's intention to abate the payment of Rent under this Lease. If Landlord does not commence to cure such
Abatement Event within three (3) business days of receipt of the Additional Notice and thereafter diligently pursue the cure to completion,
Tenant  may,  upon  written  notice  to  Landlord,  immediately  abate  Base  Rent  and  Tenant's  Share  of  Operating  Expenses  and  Tax  Expenses
payable under this Lease for that portion of the Premises rendered untenantable and not actually used by Tenant, for the period beginning on
the  date  that  is  three  (3)  business  days  after  the  Initial  Notice  to  the  earlier  of  the  date  Landlord  cures  such  Abatement  Event  or  the  date
Tenant recommences the use of such portion of the Premises. If Tenant fails to immediately provide the Additional Notice and commence
applying any abatement of Base Rent and Tenant's Share of Operating Expenses and Tax Expenses payable under this Lease for that portion
of  the  Premises  rendered  untenantable  and  not  actually  used  by  Tenant,  then  Tenant's  right  to  abate  Base  Rent  and  Tenant's  Share  of
Operating  Expenses  and  Tax  Expenses  shall  be  of  no  further  force  or  effect  with  respect  to  the  applicable  Abatement  Event.  Except  as
provided in this Section 6.6, nothing contained herein shall be interpreted to mean that Tenant is excused from paying Rent due hereunder.

ARTICLE 7

REPAIRS

7.1

Tenant's Repairs. Subject to Landlord's repair obligations in Sections 7.2 and 11.1 below, Tenant shall, at Tenant's own
expense,  keep  the  Premises,  including  all  improvements,  fixtures  and  furnishings  therein,  in  good  order,  repair  and  condition  at  all  times
during the Lease Term, which repair obligations shall include, without limitation, the obligation to promptly and adequately repair all damage
to  the  Premises  and  replace  or  repair  all  damaged  or  broken  fixtures  and  appurtenances;  provided  however,  that,  at  Landlord's  option,  if
Tenant fails to make such repairs within thirty (30) days after written notice thereof from Landlord, Landlord may, but need not, make such
repairs and replacements, and Tenant shall pay Landlord the cost thereof, including an administrative fee equal to four percent (4%) of the
cost thereof forthwith upon being billed for same.

7.2

Landlord's Repairs. Anything contained in Section 7.1 above to the contrary notwithstanding, and subject to Articles 11
and 12 below, Landlord shall repair and maintain the structural portions of the Building and the basic plumbing, mechanical, HVAC, life-
safety and electrical systems serving the Building and not located in the Premises; provided, however, (but subject to the mutual waiver of
subrogation below) to the extent such maintenance and repairs are caused by the act, neglect, fault of or omission of any duty by Tenant, its
agents,  contractors,  employees,  licensees  or  invitees,  Tenant  shall  pay  to  Landlord,  as  Additional  Rent,  the  reasonable  cost  of  such
maintenance  and  repairs.  Landlord  shall  not  be  liable  to  Tenant  for  any  failure  to  make  any  such  repairs,  or  to  perform  any  maintenance
hereunder. There shall be no abatement of Rent and no liability of Landlord by reason of any injury to or interference with Tenant's business
arising from the making of or failure to make any repairs, alterations or improvements in or to any portion of the Premises or Project or in or
to fixtures, appurtenances and equipment therein. Tenant hereby waives and releases its right to make repairs at Landlord's expense under
Sections 1941 and 1942 of the California Civil Code, or under any similar law, statute, or ordinance now or hereafter in effect.

ARTICLE 8

ADDITIONS AND ALTERATIONS

8.1

Landlord's  Consent  to  Alterations.  Tenant  may  not  make  any  improvements,  alterations,  additions  or  changes  to  the
Premises  (collectively,  the  "Alterations")  without  first  procuring  the  prior  written  consent  of  Landlord  to  such  Alterations,  which  consent
shall be requested by Tenant not less than ten (10) days prior to the commencement thereof, and which consent shall not be unreasonably
withheld  by  Landlord;  provided,  however,  Landlord  may  withhold  its  consent  in  its  sole  and  absolute  discretion  with  respect  to  any
Alterations  which  (i)  may  affect  the  structural  components  of  the  Building,  or  the  Building's  mechanical,  electrical,  HVAC,  or  life  safety
systems, or (ii) are visible from or affect any area located outside the Premises. Tenant shall pay for all overhead, general conditions, fees and
other costs of the Alterations, and shall pay to Landlord a Landlord supervision fee of four percent (4%) of the cost of the Alterations.

8.2

Manner of Construction. Landlord may impose, as a condition of its consent to any and all Alterations or repairs of the
Premises, such requirements as Landlord in its reasonable discretion may deem desirable, including, but not limited to, the requirement that
Tenant utilize for such purposes only contractors, materials, mechanics and materialmen approved by Landlord; provided, however, Landlord

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may  impose  such  requirements  as  Landlord  may  determine,  in  its  sole  and  absolute  discretion,  with  respect  to  any  work  affecting  the
structural  components  of  the  Building  and/or  the  Building's  systems  and  equipment  (including  designating  specific  contractors  to  perform
such  work).  Tenant  shall  construct  such  Alterations  and  perform  such  repairs  in  compliance  with  all  applicable  laws  (including,  without
limitation,  California  Energy  Code,  Title  24)  and  pursuant  to  a  valid  building  permit,  issued  by  the  city  or  municipality  governing  the
Building, and in conformance with Landlord's construction rules and regulations. All work with respect to any Alterations must be done in a
good  and  workmanlike  manner  and  diligently  prosecuted  to  completion  to  the  end  that  the  Premises  shall  at  all  times  be  a  complete  unit
except during the period of work. Tenant shall cause all Alterations to be performed in such manner as not to obstruct access by any person to
the Building or Project or the common areas, and as not to obstruct the business of Landlord or other tenants in the Project, or interfere with
the labor force working at the Building or Project. If Tenant makes any Alterations, Tenant agrees to carry "Builder's All Risk" insurance in
an amount approved by Landlord covering the construction of such Alterations, and such other insurance as Landlord may require, it being
understood  and  agreed  that  all  of  such  Alterations  shall  be  insured  by  Tenant  pursuant  to  Article 10  below  immediately  upon  completion
thereof. Landlord may, in its discretion, require Tenant to obtain a lien and completion bond or some alternate form of security satisfactory to
Landlord  in  an  amount  sufficient  to  ensure  the  lien-free  completion  of  such  Alterations  and  naming  Landlord  as  a  co-obligee.  Upon
completion of any Alterations, Tenant shall (i) cause a timely Notice of Completion to be recorded in the office of the Recorder of the County
in which the Project is located in accordance with the terms of Section 8182 of the Civil Code of the State of California or any successor
statute, (ii) deliver to the Building management office a reproducible copy of the "as built" drawings of the Alterations, and (iii) deliver to
Landlord evidence of payment, contractors' affidavits and full and final waivers of all liens for labor, services or materials.

8.3

Landlord's  Property.  All  Alterations,  improvements  and  fixtures  which  may  be  installed  or  placed  in  or  about  the
Premises shall be at the sole cost of Tenant and shall be and become the property of Landlord. Notwithstanding the foregoing, Landlord may,
by written notice to Tenant prior to the end of the Lease Term, require Tenant at Tenant's expense to remove any improvements or Alterations
from the Premises and repair any damage to the Premises and Building caused by such removal if Landlord's consent to such improvement or
Alteration was not obtained. With respect to any improvement or Alteration made or caused to be made by Tenant with Landlord's consent,
Tenant shall have no obligation to remove such improvement or Alteration unless at the time Landlord approved the final working drawings
for any such improvement or Alteration, Landlord, by written notice to Tenant, identified those improvements or Alterations which Landlord
would  require  Tenant  to  remove  at  the  expiration  or  earlier  termination  of  this  Lease,  in  which  event  Tenant,  at  Tenant's  sole  cost  and
expense,  shall  remove  such  identified  improvements  or  Alterations  on  or  before  the  expiration  of  the  Lease  Term  and  repair  any  damage
resulting from such removal. If Tenant fails to complete such removal and/or repair by the end of the Lease Term, Landlord may do so and
may charge the cost thereof to Tenant.

ARTICLE 9

COVENANT AGAINST LIENS

Tenant has no authority or power to cause or permit any lien or encumbrance of any kind whatsoever, whether created by act of
Tenant,  operation  of  law  or  otherwise,  to  attach  to  or  be  placed  upon  the  Project  or  any  portion  thereof,  and  any  and  all  liens  and
encumbrances created by Tenant shall attach to Tenant's interest only. Landlord shall have the right at all times to post and keep posted on the
Premises  any  notice  which  it  deems  necessary  for  protection  from  such  liens.  Tenant  shall  not  cause  or  permit  any  lien  of  mechanics  or
materialmen  or  others  to  be  placed  against  the  Project  or  any  portion  thereof,  with  respect  to  work  or  services  claimed  to  have  been
performed for or materials claimed to have been furnished to Tenant or the Premises, and, in case of any such lien attaching or notice of any
lien, Tenant shall cause it to be immediately released and removed of record. If such lien is not released and removed within five (5) business
days after notice of such lien is delivered by Landlord to Tenant, then Landlord may, at its option, take all action necessary to release and
remove such lien, without any duty to investigate the validity thereof, and all sums, costs and expenses, including reasonable attorneys' fees,
incurred  by  Landlord  in  connection  with  such  lien  shall  be  deemed  Additional  Rent  under  this  Lease  and  shall  immediately  be  due  and
payable by Tenant.

ARTICLE 10

INSURANCE

10.1

Indemnification  and  Waiver.  Tenant  hereby  assumes  all  risk  of  damage  to  property  and  injury  to  persons  in,  on  or
about  the  Premises  from  any  cause  whatsoever  (including  Casualty),  and  agrees  that  Landlord,  its  members,  partners,  submembers  and
subpartners,  and  their  respective  officers,  directors,  shareholders,  agents,  property  managers,  employees  and  independent  contractors,
Kennedy-Wilson  Properties  Ltd.  and  Landlord's  mortgagees  (collectively,  the  "Landlord  Parties")  shall  not  be  liable  for,  and  are  hereby
released from any responsibility for, any damage or injury either to person or property or

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resulting from the loss of use thereof, which damage or injury is sustained by Tenant or by other persons claiming through Tenant. Tenant
shall indemnify, defend, protect and hold harmless the Landlord Parties from and against any and all loss, cost, damage, expense, claims and
liability, including without limitation court costs, reasonable attorneys' fees, laboratory testing fees, personal injury claims, clean-up costs and
environmental consultants' fees (collectively "Claims") incurred in connection with or arising from any cause in, on or about the Premises,
and/or  any  acts,  omissions  or  negligence  of  Tenant  or  of  any  person  claiming  by,  through  or  under  Tenant,  or  of  the  contractors,  agents,
employees, licensees or invitees of Tenant or any such person in, on or about the Project, provided, however, that the terms of the foregoing
indemnity shall not apply to: (i) any Claims to the extent resulting from the negligence or willful misconduct of Landlord or the Landlord
Parties and not insured (or required to be insured) by Tenant under this Lease; or (ii) any loss of or damage to Landlord's property to the
extent Landlord has waived such loss or damage pursuant to Section 10.4 below. Tenant's agreement to indemnify Landlord pursuant to this
Section 10.1  is  not  intended  and  shall  not  relieve  any  insurance  carrier  of  its  obligations  under  policies  required  to  be  carried  by  Tenant
pursuant to this Lease. The provisions of this Section 10.1 shall survive the expiration or sooner termination of this Lease with respect to any
Claims occurring prior to such expiration or termination.

10.2

Tenant's Compliance with Landlord's Fire and Casualty Insurance. Tenant shall, at Tenant's expense, comply as to the
Premises with all insurance company requirements pertaining to the use of the Premises. If Tenant's conduct or use of the Premises causes
any  increase  in  the  premium  for  any  insurance  policies  carried  by  Landlord,  then  Tenant  shall  reimburse  Landlord  for  any  such  increase.
Tenant, at Tenant's expense, shall comply with all rules, orders, regulations or requirements of the American Insurance Association (formerly
the National Board of Fire Underwriters) and with any similar body.

10.3

Tenant's Insurance. Tenant shall maintain the following coverages in the following amounts at all times following the
date (the "Insurance Start Date") which is the earlier of (i) Tenant's entry into the Premises to perform any work therein, or (ii) the Possession
Date, and continuing thereafter throughout the Lease Term:

10.3.1

Commercial  General  Liability  Insurance  covering  the  insured  against  claims  of  bodily  injury,  personal
injury and property damage arising out of Tenant's operations, assumed liabilities or use of the Premises, including a Commercial General
Liability endorsement covering the insuring provisions of this Lease and the performance by Tenant of the indemnity agreements set forth in
Section 10.1 above (and with owned and non-owned automobile liability coverage, and liquor liability coverage if alcoholic beverages are
served on the Premises), for limits of liability not less than: (i) Bodily Injury and Property Damage Liability – $3,000,000 each occurrence
and  $3,000,000  annual  aggregate,  and  (ii)  Personal  Injury  Liability  -  $3,000,000  each  occurrence  and  $3,000,000  annual  aggregate.  Such
insurance may be obtained through a combination of primary and/or umbrella/excess liability insurance.

10.3.2

Physical Damage Insurance covering (i) all office furniture, trade fixtures, office equipment, merchandise
and  all  other  items  of  Tenant's  property  on  the  Premises  installed  by,  for,  or  at  the  expense  of  Tenant,  and  (ii)  all  tenant  improvements,
Alterations  and  other  improvements  and  additions  in  and  to  the  Premises,  including  any  improvements,  alterations  or  additions  installed
above the ceiling of the Premises or below the floor of the Premises. Such insurance shall be written on an "all-risks" physical loss or damage
basis,  for  the  full  replacement  cost  value  new  without  deduction  for  depreciation  of  the  covered  items  and  in  amounts  that  meet  any  co-
insurance clauses of the policies of insurance and shall include a vandalism and malicious mischief endorsement, sprinkler leakage coverage
and earthquake sprinkler leakage coverage.

10.3.3

At all times during the Lease Term, Tenant shall procure and maintain Workers’ Compensation Insurance
in  accordance  with  the  laws  of  the  State  of  California,  and  Employer’s  Liability  insurance  with  a  limit  not  less  than  One  Million  Dollars
($1,000,000)  Bodily  Injury  Each  Accident;  One  Million  Dollars  ($1,000,000)  Bodily  Injury  By  Disease  -  Each  Person;  and  One  Million
Dollars ($1,000,000) Bodily Injury to Disease - Policy Limit.

Business  interruption,  loss-of-income  and  extra-expense  insurance  in  such  amounts  as  will  reimburse
Tenant  for  direct  and  indirect  loss  of  earnings  attributable  to  all  perils  commonly  insured  against  by  prudent  tenants  or  attributable  to
prevention of access to the Premises or to the Building as a result of such perils.

10.3.4

10.3.5

Form of Policies. The minimum limits of policies of insurance required of Tenant under this Lease shall
in no event limit the liability of Tenant under this Lease. Such insurance shall: (i) name Landlord, and any other party it so specifies, as loss
payees or additional insureds, as their respective interests may appear (for the insurance to be provided under Sections 10.3.1 and 10.3.2(ii)
above, only); (ii) specifically cover the liability assumed by Tenant under this Lease, including, but not limited to, Tenant's obligations under
Section 10.1 above; (iii) be issued by an insurance company having a rating of not less than A-VIII in Best's Insurance Guide or which is
otherwise acceptable to Landlord

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and  licensed  to  do  business  in  California;  (iv)  be  primary  insurance  as  to  all  claims  thereunder  and  provide  that  any  insurance  carried  by
Landlord is excess and is non-contributing with any insurance requirement of Tenant; (v) provide that said insurance shall not be canceled or
coverage changed unless thirty (30) days' prior written notice shall have been given to Landlord and any mortgagee of Landlord; (vi) contain
a cross- liability endorsement or severability of interest clause reasonably acceptable to Landlord; and (vii) except with respect to property
damage insurance (which shall be governed by the provisions of Section 10.4 below), contain a waiver of subrogation in favor of Landlord
and any other parties designated by Landlord from time to time as additional insured pursuant to clause (i) hereinabove. Tenant shall deliver
such policies or certificates thereof to Landlord on or before the Insurance Start Date and at least thirty (30) days before the expiration dates
thereof. If Tenant shall fail to procure such insurance, or to deliver such policies or certificate, within such time periods, Landlord may, at its
option,  in  addition  to  all  of  its  other  rights  and  remedies  under  this  Lease,  and  without  regard  to  any  notice  and  cure  periods  set  forth  in
Section 19.1 below, procure such policies for the account of Tenant, and the cost thereof shall be paid by Tenant to Landlord as Additional
Rent within ten (10) days after delivery of bills therefor. At Tenant's option, Tenant may provide the coverages required under this Article 10
through blanket policies of insurance covering Tenant's other properties so long as the coverage required under this Lease with respect to the
Premises and Project is not reduced or impaired as a result thereof (including as a result of any claims made or aggregate limits with respect
to such other properties).

10.4

Subrogation.  Landlord  and  Tenant  agree  to  have  their  respective  insurance  companies  issuing  property  damage
insurance  waive  any  rights  of  subrogation  that  such  companies  may  have  against  Landlord  or  Tenant,  as  the  case  may  be.  Landlord  and
Tenant hereby waive any right that either may have against the other on account of any loss or damage to their respective property to the
extent such loss or damage is insured under property damage insurance policies carried by the waiving party under this Lease (or would have
been covered had the waiving party maintained such insurance as so required under this Lease). If either party fails to carry the amounts and
types of insurance required to be carried by it pursuant to this Article 10, in addition to any remedies the other party may have under this
Lease,  such  failure  shall  be  deemed  to  be  a  covenant  and  agreement  by  such  party  to  self-insure  with  respect  to  the  type  and  amount  of
insurance which such party so failed to carry, with full waiver of subrogation with respect thereto.

10.5

Additional Insurance Obligations. Tenant shall carry and maintain during the entire Lease Term, at Tenant's sole cost
and expense, increased amounts of the insurance required to be carried by Tenant pursuant to this Article 10, and such other reasonable types
of insurance coverage and in such reasonable amounts covering the Premises and Tenant's operations therein, as may be reasonably requested
by Landlord; provided, however, that in no event shall (i) Tenant receive notice of an increased amount or new type of insurance more than
once during the Lease Term, and (ii) such increased coverage be in excess of that required by landlords of Comparable Buildings (as defined
in the Extension Option Rider attached to this Lease).

ARTICLE 11

DAMAGE AND DESTRUCTION

11.1

Repair of Damage to Premises by Landlord.  Tenant  shall  promptly  notify  Landlord  of  any  damage  to  the  Premises
resulting from fire or any other casualty ("Casualty") or any condition existing in the Premises as a result of a Casualty that would give rise to
the terms of this Article 11. If the Premises or any common areas of the Building or Project serving or providing access to the Premises shall
be  damaged  by  Casualty  or  be  subject  to  a  condition  existing  as  a  result  of  a  Casualty,  Landlord  shall  promptly  and  diligently,  subject  to
reasonable  delays  for  insurance  adjustment  or  other  matters  beyond  Landlord's  reasonable  control,  and  subject  to  all  other  terms  of  this
Article  11,  restore  the  base,  shell,  and  core  of  the  Premises  and  such  common  areas  to  substantially  the  same  condition  as  existed
immediately prior to the Casualty, except for modifications required by applicable laws and/or by the holder of a mortgage on the Project (or
any portion thereof), or any other modifications to the common areas deemed desirable by Landlord provided that access to the Premises and
any common restrooms serving the Premises shall not be materially impaired. Upon the occurrence of any damage to the Premises, Tenant
shall assign to Landlord (or to any party designated by Landlord) all insurance proceeds payable to Tenant under Tenant's insurance required
under Section 10.3.2(ii) above, and Landlord shall repair any damage to the tenant improvements and Alterations installed in the Premises
and shall return such tenant improvements and Alterations to their original condition; provided that if the costs of such repair of such tenant
improvements and Alterations by Landlord exceeds the amount of insurance proceeds received by Landlord therefor from Tenant's insurance
carrier, as assigned by Tenant, the excess costs of such repairs shall be paid by Tenant to Landlord prior to Landlord's repair of the damage. In
connection  with  such  repairs  and  replacements  of  any  such  tenant  improvements  and  Alterations,  Tenant  shall,  prior  to  Landlord's
commencement of such improvement work, submit to Landlord, for Landlord's review and approval, all plans, specifications and working
drawings relating thereto, and Landlord shall select the contractors to perform such improvement work. Landlord shall not be liable for any
inconvenience or annoyance to Tenant or its visitors, or injury to Tenant's business resulting in any way from such damage

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or  the  repair  thereof;  provided  however,  that  if  such  Casualty  shall  have  damaged  the  Premises  or  common  areas  necessary  to  Tenant's
occupancy, and if such damage is not the result of the negligence or willful misconduct of Tenant or Tenant's agents, employees, contractors,
licensees or invitees, Landlord shall allow Tenant a proportionate abatement of Base Rent, and Tenant's Share of Operating Expenses and Tax
Expenses  during  the  time  and  to  the  extent  the  Premises  are  unfit  for  occupancy  for  the  purposes  permitted  under  this  Lease,  and  not
occupied by Tenant as a result thereof. Notwithstanding any contrary provision of this Article 11, the parties hereby agree as follows: (i) the
closure of the Project, the Building, the common areas, or any part thereof to protect public health shall not constitute a Casualty for purposes
of this Lease; (ii) Casualty covered by this Article 11 shall require that the physical or structural integrity of the Premises, the Project, the
Building, or the common areas is degraded as a direct result of such occurrence; and (iii) a Casualty under this Article 11 shall not be deemed
to  occur  merely  because  Tenant  is  unable  to  productively  use  the  Premises  in  the  event  that  the  physical  and  structural  integrity  of  the
Premises is undamaged.

11.2

Landlord's Option to Repair. Notwithstanding Section 11.1 above to the contrary, Landlord may elect not to rebuild
and/or  restore  the  Premises,  the  Building  and/or  any  other  portion  of  the  Project  and  instead  terminate  this  Lease  by  notifying  Tenant  in
writing  of  such  termination  within  sixty  (60)  days  after  the  date  Landlord  becomes  aware  of  such  damage,  such  notice  to  include  a
termination date giving Tenant sixty (60) days to vacate the Premises, but Landlord may so elect only if the Building shall be damaged by
Casualty or be subject to a condition existing as a result of such Casualty, whether or not the Premises are affected, and one or more of the
following  conditions  is  present:  (i)  repairs  cannot  reasonably  be  substantially  completed  in  accordance  with  applicable  laws  within  one
hundred eighty (180) days after the date of such damage (when such repairs are made without the payment of overtime or other premiums);
(ii) the holder of any mortgage on the Project or ground lessor with respect to the Project shall require that the insurance proceeds or any
portion thereof be used to retire the mortgage debt, or shall terminate the ground lease, as the case may be; or (iii) the damage or condition
arising as a result of such damage is not fully covered, except for deductible amounts, by Landlord's insurance policies. In addition, if the
Premises, the Building or any portion of the Project is destroyed or damaged to any substantial extent during the last two (2) years of the
Lease  Term,  then  notwithstanding  anything  contained  in  this  Article 11,  Landlord  shall  have  the  option  to  terminate  this  Lease  by  giving
written notice to Tenant of the exercise of such option within thirty (30) days after such damage, in which event this Lease shall cease and
terminate as of the date of such notice. Upon such termination of this Lease pursuant to this Section 11.2, Tenant shall pay the Base Rent and
Additional  Rent,  properly  apportioned  up  to  such  date  of  damage  (subject  to  any  abatement  as  provided  in Section 11.1  above),  and  both
parties hereto shall thereafter be discharged of all further obligations under this Lease, except for those obligations which expressly survive
the expiration or earlier termination of this Lease.

11.3

Waiver  of  Statutory  Provisions.  The  provisions  of  this  Lease,  including  this  Article  11,  constitute  an  express
agreement  between  Landlord  and  Tenant  with  respect  to  any  and  all  damage  to,  or  destruction  of,  all  or  any  part  of  the  Project,  and  any
statute or regulation of the State of California, including, without limitation, Sections 1932(2) and 1933(4) of the California Civil Code, with
respect to any rights or obligations concerning damage or destruction in the absence of an express agreement between the parties, and any
other statute or regulation, now or hereafter in effect, shall have no application to this Lease or any damage or destruction to all or any part of
the Project.

ARTICLE 12

CONDEMNATION

If ten percent (10%) or more of the Premises, Building or Project shall be taken by power of eminent domain or condemned by
any competent authority for any public or quasi-public use or purpose, or if Landlord shall grant a deed or other instrument in lieu of such
taking by eminent domain or condemnation, Landlord shall have the option to terminate this Lease upon ninety (90) days' notice to Tenant,
provided  such  notice  is  given  no  later  than  one  hundred  eighty  (180)  days  after  the  date  of  such  taking,  condemnation,  deed  or  other
instrument.  If  more  than  twenty-five  percent  (25%)  of  the  rentable  square  feet  of  the  Premises  is  taken,  or  if  access  to  the  Premises  is
substantially impaired as a result of any taking of all or any portion of the Project, Tenant shall have the option to terminate this Lease upon
ninety (90) days' notice to Landlord, provided such notice is given no later than one hundred eighty (180) days after the date of such taking.
Landlord shall be entitled to receive the entire award or payment in connection therewith, except that Tenant shall have the right to file any
separate claim available to Tenant for any taking of Tenant's personal property and fixtures belonging to Tenant and removable by Tenant
upon expiration of the Lease Term pursuant to the terms of this Lease, and for moving expenses, so long as such claim does not diminish the
award available to Landlord, or its ground lessor or mortgagee with respect to the Project, and such claim is payable separately to Tenant. All
Rent shall be apportioned as of the date of such termination, or the date of such taking, whichever shall first occur. If any part of the Premises
shall be taken, and this Lease shall not be so terminated, the Base Rent and Tenant's Share of Operating Expenses and Tax Expenses shall be
proportionately abated. Tenant hereby waives any and all rights it might otherwise have pursuant to Section 1265.130 of the California Code
of Civil Procedure.

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Notwithstanding  any  contrary  provision  of  this  Lease,  the  following  governmental  actions  shall  not  constitute  a  taking  or  condemnation,
either permanent or temporary: (i) an action that requires Tenant's business or the Building or Project to close during the Lease Term; and (ii)
an action taken for the purpose of protecting public safety (e.g., to protect against acts of war, the spread of communicable diseases, or an
infestation), and no such governmental actions shall entitle Tenant to any compensation from Landlord or any authority, or Rent abatement or
any other remedy under this Lease.

ARTICLE 13

COVENANT OF QUIET ENJOYMENT

Landlord  covenants  that  Tenant,  on  paying  the  Rent,  charges  for  services  and  other  payments  herein  reserved  and  on  keeping,
observing  and  performing  all  the  other  terms,  covenants,  conditions,  and  agreements  herein  contained  on  the  part  of  Tenant  to  be  kept,
observed  and  performed,  shall,  during  the  Lease  Term,  peaceably  and  quietly  have,  hold  and  enjoy  the  Premises  subject  to  the  terms,
covenants, conditions, and agreements hereof without interference by any persons lawfully claiming by or through Landlord. The foregoing
covenant is in lieu of any other covenant express or implied.

ARTICLE 14

ASSIGNMENT AND SUBLETTING

14.1

Transfers. Except as otherwise provided in Section 14.7 below, Tenant shall not, without the prior written consent of
Landlord, assign, mortgage, pledge, hypothecate, encumber, or permit any lien to attach to, or otherwise transfer, this Lease or any interest
hereunder,  permit  any  assignment  or  other  such  foregoing  transfer  of  this  Lease  or  any  interest  hereunder  by  operation  of  law,  sublet  the
Premises or any part thereof, or permit the use of the Premises by any persons other than Tenant and its employees (all of the foregoing are
hereinafter  sometimes  referred  to  collectively  as  "Transfers"  and  any  person  to  whom  any  Transfer  is  made  or  sought  to  be  made  is
hereinafter sometimes referred to as a "Transferee"). If Tenant shall desire Landlord's consent to any Transfer, Tenant shall notify Landlord in
writing, which notice (the "Transfer Notice") shall include (i) the proposed effective date of the Transfer, which shall not be less than twenty
(20) days nor more than one hundred eighty (180) days after the date of delivery of the Transfer Notice, (ii) a description of the portion of the
Premises to be transferred (the "Subject Space"), (iii) all of the terms of the proposed Transfer and the consideration therefor, including a
calculation of the Transfer Premium (as defined below), in connection with such Transfer, the name and address of the proposed Transferee,
and a copy of the proposed Transfer document effecting the proposed Transfer, (iv) current financial statements of the proposed Transferee
certified by an officer, partner or owner thereof, and (v) such other information as Landlord may reasonably require. Except as otherwise
provided in Section 14.7 below, any Transfer made without Landlord's prior written consent shall, at Landlord's option, be null, void and of
no effect, and shall, at Landlord's option, constitute a default by Tenant under Section 19.1.2 below. Except as otherwise provided in Section
14.7  below,  whether  or  not  Landlord  consents  to  any  proposed  Transfer,  within  thirty  (30)  days  after  written  request  by  Landlord,  as
Additional Rent hereunder, Tenant shall pay to Landlord (A) One Thousand Dollars ($1,000.00) for Landlord's review and processing fees,
and (B) any reasonable legal fees incurred by Landlord in connection with Tenant's proposed Transfer, which legal fees shall not exceed the
amount of One Thousand Dollars ($1,000.00) per each proposed Transfer.

14.2

Landlord's Consent. Subject to Landlord's rights in Section 14.4 below, Landlord shall not unreasonably withhold its
consent  to  any  proposed  Transfer  on  the  terms  specified  in  the  Transfer  Notice.  The  parties  hereby  agree  that  it  shall  be  deemed  to  be
reasonable under this Lease and under any applicable law for Landlord to withhold consent to any proposed Transfer where one or more of
the following apply, without limitation as to other reasonable grounds for withholding consent:

of the Project;

(i)

(ii)

the Transferee is of a character or reputation or engaged in a business which is not consistent with the quality

the Transferee's intended use of the Subject Space is not permitted under this Lease;

the Transferee is a governmental entity or agency, unless, and only to the extent, Landlord has leased space
in  the  Building  to,  or  approved  subleases  in  the  Building  with,  comparable  (in  terms  of  use,  security  issues,  express  or  implied  power  of
eminent domain, reputation, character and size of space in the Building) governmental entities or agencies;

(iii)

financial worth and/or financial stability in light of the responsibilities involved under the Lease on the date consent is requested;

(iv)

with  respect  to  an  assignment  of  this  Lease  or  the  Premises,  the  Transferee  is  not  a  party  of  reasonable

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Landlord is a party, or would give an occupant of the Project a right to cancel its lease; or

(v)

the  proposed  Transfer  would  cause  Landlord  to  be  in  violation  of  another  lease  or  agreement  to  which

(vi)

either the proposed Transferee, or any person or entity which directly or indirectly, controls, is controlled
by, or is under common control with, the proposed Transferee, (A) occupies space in the Project at the time of the request for consent and
space of comparable size to the Subject Space is available for lease in the Project on a direct basis from Landlord, (B) is negotiating with
Landlord to lease space in the Project at such time and space of comparable size to the Subject Space is available for lease in the Project on a
direct basis from Landlord, or (C) has negotiated with Landlord during the six (6)-month period immediately preceding the Transfer Notice.

If Landlord consents to any Transfer pursuant to the terms of this Section 14.2 (and does not exercise any recapture rights Landlord may have
under Section 14.4 below), Tenant may within six (6) months after Landlord's consent, enter into such Transfer of the Premises or portion
thereof, upon substantially the same terms and conditions as are set forth in the Transfer Notice furnished by Tenant to Landlord pursuant to
Section 14.1 above, provided that if there are any changes in the terms and conditions from those specified in the Transfer Notice (1) such
that Landlord would initially have been entitled to refuse its consent to such Transfer under this Section 14.2, or (2) which would cause the
proposed  Transfer  to  be  more  favorable  to  the  Transferee  than  the  terms  set  forth  in  Tenant's  original  Transfer  Notice,  Tenant  shall  again
submit the Transfer to Landlord for its approval and other action under this Article 14.

14.3

Transfer  Premium.  Except  as  otherwise  provided  in  Section  14.7  below,  if  Landlord  consents  to  a  Transfer,  as  a
condition  thereto  which  the  parties  hereby  agree  is  reasonable,  Tenant  shall  pay  to  Landlord  fifty  percent  (50%)  of  the  Transfer  Premium
received  by  Tenant  from  such  Transferee.  "Transfer  Premium"  shall  mean  all  rent,  additional  rent  or  other  consideration  (excluding  any
consideration  for  business  assets)  payable  by  such  Transferee  in  connection  with  the  Transfer  which  is  in  excess  of  the  Rent  payable  by
Tenant under this Lease during the term of the Transfer, on a per rentable square foot basis if less than all of the Premises is transferred, after
deducting  the  reasonable  expenses  incurred  by  Tenant  for  (i)  any  reasonable  changes,  alterations  and  improvements  to  the  Premises  in
connection with the Transfer (but only to the extent approved by Landlord), and (ii) any actual out-of-pocket brokerage commissions and
attorneys’ fees paid in connection with the Transfer. Notwithstanding the foregoing to the contrary, consideration for business assets shall not
be excluded from the calculation of the Transfer Premium to the extent (A) their exclusion (1) is a subterfuge to avoid Tenant's obligations
under this Section 14.3, and/or (2) such business assets were received by Tenant from such Transferee in lieu of any rent, additional rent or
other consideration that would have been received by Tenant from such Transferee under this Section 14.3, and/or (B) Landlord determines,
in its business judgment, that such consideration was for the leasehold value and not for general business assets. Transfer Premium shall also
include, but not be limited to, key money and bonus money paid by Transferee to Tenant in connection with such Transfer, and any payment
in  excess  of  fair  market  value  for  services  rendered  by  Tenant  to  Transferee  or  for  assets,  fixtures,  inventory,  equipment,  or  furniture
transferred by Tenant to Transferee in connection with such Transfer.

14.4

Landlord's  Option  as  to  Subject  Space.  Notwithstanding  anything  to  the  contrary  contained  in  this  Article  14,  but
subject  to  the  provisions  of  Section  14.7  below,  if  Tenant  contemplates  a  Transfer  to  anyone  other  than  an  Affiliate  pursuant  to  and  in
accordance  with  Section  14.7  below,  then  Tenant  shall  give  Landlord  notice  (the  "Intention  to  Transfer  Notice")  of  such  contemplated
Transfer (whether or not the contemplated Transferee or the terms of such contemplated Transfer have been determined). The Intention to
Transfer  Notice  shall  specify  the  portion  of  and  amount  of  rentable  square  feet  of  the  Premises  which  Tenant  intends  to  Transfer  (the
"Contemplated  Transfer  Space"),  the  contemplated  date  of  commencement  of  the  contemplated  Transfer  (the  "Contemplated  Effective
Date"), and the contemplated length of the term of such contemplated Transfer, and shall specify that such Intention to Transfer Notice is
delivered to Landlord pursuant to the terms of this Section 14.4 in order to allow Landlord to elect to recapture the Contemplated Transfer
Space  for  the  term  set  forth  in  the  Intention  to  Transfer  Notice.  Thereafter,  Landlord  shall  have  the  option,  in  connection  with  such
contemplated Transfer and all subsequent transfers, by giving written notice to Tenant ("Landlord's Recapture Notice") within fifteen (15)
days  after  receipt  of  the  Intention  to  Transfer  Notice,  to  recapture  the  Contemplated  Transfer  Space  for  a  period  to  commence  on  the
Contemplated  Effective  Date  and  to  continue  until  the  last  day  of  the  term  of  the  contemplated  Transfer  as  set  forth  in  the  Intention  to
Transfer Notice (the "Recapture Term"), and during the Recapture Term, this Lease shall terminate with respect to the Contemplated Transfer
Space;  provided,  however,  if  Tenant  notifies  Landlord  within  ten  (10)  days  after  Landlord's  receipt  of  Landlord's  Recapture  Notice  that
Tenant revokes Tenant's Intention to Transfer Notice, then such recapture and termination by Landlord in Landlord's Recapture Notice shall
be ineffective, but Tenant shall not be entitled to proceed with the contemplated Transfer which was the subject of Tenant's original Intention
to  Transfer  Notice,  and  Tenant  shall  again  be  required  to  submit  a  new  Intention  to  Transfer  Notice  to  Landlord  with  respect  to  any
contemplated Transfer, as provided above in this Section 14.4. In the event of a recapture by Landlord, if this Lease shall be terminated with
respect to less than the entire Premises, the Rent reserved herein shall be prorated on the basis of the

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number  of  rentable  square  feet  retained  by  Tenant  in  proportion  to  the  number  of  rentable  square  feet  contained  in  the  Premises,  and  this
Lease  as  so  amended  shall  continue  thereafter  in  full  force  and  effect,  and  upon  request  of  either  party,  the  parties  shall  execute  written
confirmation of the same. If Landlord declines, or fails to elect in a timely manner to recapture the Contemplated Transfer Space under this
Section 14.4 within such fifteen (15) day period, then, provided Landlord has consented to the proposed Transfer, Tenant shall be entitled to
proceed  to  transfer  the  Contemplated  Transfer  Space  to  the  proposed  Transferee,  and  Landlord  shall  not  have  any  right  to  recapture  the
Contemplated Transfer Space with respect to any Transfer thereof consummated during the six (6) month period of time (the "Six Month
Period") which commences on the expiration of such fifteen (15) day period; provided, however, that any such Transfer shall be subject to all
of  the  other  terms  of  this  Article  14.  If  such  a  Transfer  is  not  so  consummated  within  the  Six  Month  Period  (or  if  a  Transfer  is  so
consummated,  then  upon  the  expiration  of  the  term  of  any  Transfer  of  such  Contemplated  Transfer  Space  consummated  within  such  Six
Month Period), Tenant shall again be required to submit a new Intention to Transfer Notice to Landlord with respect to any contemplated
Transfer, as provided above in this Section 14.4.

14.5

Effect of Transfer. If Landlord consents to a Transfer: (i) the terms and conditions of this Lease shall in no way be
deemed  to  have  been  waived  or  modified;  (ii)  such  consent  shall  not  be  deemed  consent  to  any  further  Transfer  by  either  Tenant  or  a
Transferee; (iii) Tenant shall deliver to Landlord, promptly after execution, an original executed copy of all documentation pertaining to the
Transfer in form reasonably acceptable to Landlord; and (iv) no Transfer relating to this Lease or agreement entered into with respect thereto,
whether with or without Landlord's consent, shall relieve Tenant or any guarantor of the Lease from liability under this Lease. Landlord or its
authorized  representatives  shall  have  the  right  at  all  reasonable  times  to  audit  the  books,  records  and  papers  of  Tenant  relating  to  any
Transfer, and shall have the right to make copies thereof. If the Transfer Premium with respect to any Transfer shall be found understated,
Tenant shall, within thirty (30) days after demand, pay the deficiency and Landlord's costs of such audit.

14.6

Additional  Transfers.  Except  as  otherwise  provided  in  Section  14.7  below,  for  purposes  of  this  Lease,  the  term
"Transfer" shall also include: (i) if Tenant is a partnership or limited liability company, the withdrawal or change, voluntary, involuntary or by
operation of law, of more than fifty percent (50%) of the partners or members, or transfer of more than fifty percent (50%) of the partnership
or membership interests, within a twelve (12)-month period, or the dissolution of the partnership without immediate reconstitution thereof;
and (ii) if Tenant is a closely held corporation (i.e., whose stock is not publicly held and not traded through an exchange or over the counter),
(A) the dissolution, merger, consolidation or other reorganization of Tenant, or (B) the sale or other transfer of more than an aggregate of fifty
percent  (50%)  of  the  voting  shares  of  Tenant  (other  than  to  immediate  family  members  by  reason  of  gift  or  death),  within  a  twelve  (12)-
month  period,  or  (C)  the  sale,  mortgage,  hypothecation  or  pledge  of  more  than  an  aggregate  of  fifty  percent  (50%)  of  the  value  of  the
unencumbered assets of Tenant within a twelve (12) month period.

14.7

Permitted  Transfers  to  Affiliates.  Notwithstanding  the  foregoing  provisions  of  this  Article  14  to  the  contrary,  the
assignment or subletting by Tenant of all or any portion of this Lease or the Premises to (i) a parent or subsidiary of Tenant, or (ii) any person
or entity which controls, is controlled by or under common control with Tenant, or (iii) any entity which purchases all or substantially all of
the  assets  and/or  stock  of  Tenant,  or  (iv)  a  successor  to  Tenant  or  any  of  the  foregoing  entities  by  purchase,  merger,  consolidation  or
reorganization (all such persons or entities described in (i), (ii), (iii) and (iv) being sometimes hereinafter referred to as "Affiliates") shall not
be deemed a Transfer under this Article 14, and thus shall not be subject to the requirement of obtaining Landlord's consent thereto in Section
14.2 above, or Landlord's right to receive any Transfer Premium pursuant to Section 14.3 above or any fees described in the last sentence of
Section 14.1 above, provided that:

the obligations of this Article 14, or (ii) adversely affect the ability of Tenant to satisfy its obligations under this Lease;

14.7.1

any such Affiliate was not formed, and such transaction was not entered into, as a subterfuge to (i) avoid

14.7.2

Tenant gives Landlord at least five (5) business days' prior notice of any such assignment or sublease to
an  Affiliate,  provided  that  if  Tenant  is  prohibited  from  providing  such  prior  notice  by  applicable  laws  or  any  applicable  confidentiality
agreement,  then  Tenant  shall  provide  notice  to  Landlord  as  soon  as  reasonably  practicable  after  the  effective  date  of  such  assignment  or
sublease;

the successor of Tenant and Tenant have as of the effective date of any such assignment or sublease a
tangible  net  worth  and  liquidity,  in  the  aggregate,  computed  in  accordance  with  generally  accepted  accounting  principles  (but  excluding
goodwill as an asset), which is sufficient to meet the obligations of Tenant under this Lease;

14.7.3

any such assignment or sublease shall be subject and subordinate to all of the terms and provisions of this
Lease,  and  such  assignee  or  sublessee  shall  assume,  in  a  written  document  reasonably  satisfactory  to  Landlord  and  delivered  to  Landlord
upon or prior to the effective date of such

14.7.4

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assignment or sublease, all the obligations of Tenant under this Lease with respect to the Subject Space which is the subject of such Transfer
(other  than  the  amount  of  Base  Rent  and  Tenant's  Share  of  Operating  Expenses  and  Tax  Expenses  payable  by  Tenant  with  respect  to  a
sublease); and

14.7.5

Tenant shall remain fully liable for all obligations to be performed by Tenant under this Lease.

"Control", as used in this Section 14.7, shall mean the possession, direct or indirect, of the power to cause the direction of the management
and policies of a person or entity, or ownership of any sort, whether through the ownership of voting securities, by contract or otherwise.

ARTICLE 15

SURRENDER OF PREMISES; REMOVAL OF PERSONAL PROPERTY

15.1

Surrender  of  Premises.  No  act  or  thing  done  by  Landlord  or  any  agent  or  employee  of  Landlord  during  the  Lease
Term shall be deemed to constitute an acceptance by Landlord of a surrender of the Premises unless such intent is specifically acknowledged
in a writing signed by Landlord. The delivery of keys to the Premises to Landlord or any agent or employee of Landlord shall not constitute a
surrender  of  the  Premises  or  effect  a  termination  of  this  Lease,  whether  or  not  the  keys  are  thereafter  retained  by  Landlord,  and
notwithstanding such delivery Tenant shall be entitled to the return of such keys at any reasonable time upon request until this Lease shall
have  been  terminated.  The  voluntary  or  other  surrender  of  this  Lease  by  Tenant,  whether  accepted  by  Landlord  or  not,  or  a  mutual
termination  hereof,  shall  not  work  a  merger,  and  at  the  option  of  Landlord  shall  operate  as  an  assignment  to  Landlord  of  all  subleases  or
subtenancies affecting the Premises.

15.2

Removal of Tenant Property by Tenant. All articles of personal property and all business and trade fixtures, machinery
and equipment, furniture and movable partitions owned by Tenant or installed by Tenant at its expense in the Premises, which items are not a
part of the tenant improvements or Alterations installed in the Premises, shall remain the property of Tenant, and may be removed by Tenant
at any time during the Lease Term as long as (i) Tenant is not in default under this Lease with any applicable cure period having expired, and
(ii)  Tenant  repairs,  at  its  expense,  all  damage  resulting  from  such  removal.  Upon  the  expiration  of  the  Lease  Term,  or  upon  any  earlier
termination of this Lease, Tenant shall, subject to the provisions of this Article 15, quit and surrender possession of the Premises to Landlord
in as good order and condition as when Tenant took possession and as thereafter improved by Landlord and/or Tenant, reasonable wear and
tear and repairs which are specifically made the responsibility of Landlord hereunder excepted. Upon such expiration or termination, Tenant
shall, without expense to Landlord, remove or cause to be removed from the Premises all Lines (as defined below) installed or caused to be
installed by Tenant (including any Lines installed by or for Tenant above the ceiling of the Premises or below the floor of the Premises), all
debris  and  rubbish,  and  such  items  of  furniture,  equipment,  free-standing  cabinet  work,  and  other  articles  of  personal  property  owned  by
Tenant or installed or placed by Tenant at its expense in the Premises, and such similar articles of any other persons claiming under Tenant, as
Landlord  may,  in  its  sole  discretion,  require  to  be  removed,  and  Tenant  shall  repair  at  its  own  expense  all  damage  to  the  Premises  and
Building resulting from such removal.

ARTICLE 16

HOLDING OVER

If  Tenant  holds  over  after  the  expiration  of  the  Lease  Term,  with  or  without  the  express  or  implied  consent  of  Landlord,  such
tenancy shall be a tenancy at sufferance, and shall not constitute a renewal hereof or an extension for any further term, and in such case Base
Rent shall be payable at a monthly rate equal to one hundred fifty percent (150%) of the Base Rent applicable during the last rental period of
the Lease Term under this Lease. Such tenancy shall be subject to every other applicable term, covenant and agreement contained herein.
Nothing  contained  in  this  Article  16  shall  be  construed  as  consent  by  Landlord  to  any  holding  over  by  Tenant,  and  Landlord  expressly
reserves the right to require Tenant to surrender possession of the Premises to Landlord as provided in this Lease upon the expiration or other
termination of this Lease. The provisions of this Article 16 shall not be deemed to limit or constitute a waiver of any other rights or remedies
of  Landlord  provided  herein  or  at  law.  If  Tenant  holds  over  without  Landlord's  consent,  such  holding  over  may  compromise  or  otherwise
affect Landlord's ability to enter into new leases with prospective tenants regarding the Premises. Therefore, if Tenant fails to surrender the
Premises upon the termination or expiration of this Lease, in addition to any other liabilities to Landlord accruing therefrom, Tenant shall
protect, defend, indemnify and hold Landlord harmless from and against all Claims resulting from such failure, including, without limiting
the generality of the foregoing, any claims made by any succeeding tenant founded upon such failure to surrender, and any losses suffered by
Landlord, including lost profits, resulting from such failure to surrender.

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ARTICLE 17

ESTOPPEL CERTIFICATES

Within  ten  (10)  business  days  following  a  request  in  writing  by  Landlord,  or  any  Mortgagee  (as  defined  below),  Tenant  shall
execute  and  deliver  to  Landlord  an  estoppel  certificate  which,  as  submitted  by  Landlord,  shall  be  substantially  in  the  form  of  Exhibit  D,
attached hereto (or such other form as may be required by any prospective mortgagee or purchaser of the Project or any portion thereof),
indicating therein any exceptions thereto that may exist at that time, and shall also contain any other information reasonably requested by
Landlord  or  Landlord's  Mortgagee  or  Landlord's  prospective  mortgagees  or  purchasers.  Tenant  shall  execute  and  deliver  whatever  other
instruments  may  be  reasonably  required  for  such  purposes.  If  Tenant  fails  to  execute  and  deliver  such  estoppel  certificate  (or  other
instruments)  within  ten  (10)  business  days,  it  shall  be  deemed  conclusively  to  have  acknowledged  the  accuracy  of  the  matter  set  forth  in
Landlord's  estoppel  certificate  (or  such  other  instruments).  At  any  time  during  the  Lease  Term,  Landlord  may  require  Tenant  to  provide
Landlord  with  a  current  financial  statement  and  financial  statements  of  the  two  (2)  years  prior  to  the  current  financial  statement  year;
provided,  however,  that  Tenant  shall  not  be  required  to  provide  such  financial  statements  to  the  extent  the  same  are  otherwise  publicly
available  to  Landlord.  Such  statements  shall  be  prepared  in  accordance  with  generally  accepted  accounting  principles  and,  if  such  is  the
normal practice of Tenant, shall be audited by an independent certified public accountant. Failure of Tenant to timely execute and deliver
such  estoppel  certificate  or  other  instruments  shall  constitute  an  acceptance  of  the  Premises  and  an  acknowledgment  by  Tenant  that
statements included in the estoppel certificate are true and correct, without exception.

ARTICLE 18

SUBORDINATION AND ATTORNMENT

18.1

Subordination. This Lease is and shall be subject and subordinate to each ground lease of the Project and to the lien of
each  mortgage  or  trust  deed  of  trust  now  or  hereafter  in  force  against  the  Project  (herein,  a  "Mortgage"),  and  to  all  renewals,  extensions,
modifications,  consolidations  and  replacements  thereof,  and  to  all  advances  made  or  hereafter  to  be  made  upon  the  security  of  each  such
Mortgage, unless the holder of any such Mortgage (each, a "Mortgagee"), or the lessors under any such ground lease requires in writing that
this  Lease  be  superior  thereto.  Such  subordination  shall  be  effective  automatically  and  without  the  need  for  further  documentation,  but,  if
requested by the Landlord and/or the Mortgagee of any such Mortgage or the lessor under any such ground lease, Tenant shall, within ten
(10) business days after Tenant's receipt of such request, execute such further instruments or assurances as such Mortgagee or ground lessor
shall reasonably require. If a Mortgagee of a Mortgage made prior to the execution of this Lease shall request that this Lease have priority
over  such  Mortgage,  this  Lease  shall  have  priority  over  such  Mortgage  and  all  renewals,  modifications,  replacements,  consolidations  and
extensions thereof and all advances made thereunder and the interest thereon, and Tenant shall, within ten (10) days after Tenant's receipt of
same, execute, acknowledge and deliver to such Mortgagee any and all documents and instruments required by such mortgagee to confirm
the priority of this Lease. Tenant waives the provisions of any current or future statute, rule or law which may give or purport to give Tenant
any  right  or  election  to  terminate  or  otherwise  adversely  affect  this  Lease  and  the  obligations  of  Tenant  hereunder  in  the  event  of  any
foreclosure proceeding or sale.

18.2

Attornment. In the event of (i) the termination of any ground lease of the Project or (ii) the purchase of the Premises
or  Landlord’s  interest  therein  in  a  foreclosure  sale  or  by  deed  in  lieu  of  foreclosure  under  any  Mortgage  or  pursuant  to  a  power  of  sale
contained  in  any  Mortgage,  then  in  any  of  such  events  Tenant  shall,  at  the  request  of  such  transferee  or  purchaser  of  Landlord’s  interest,
attorn to and recognize the transferee or purchaser of Landlord’s interest or ground lease, as the case may be, as “Landlord” under this Lease
for the balance then remaining of the Term, and thereafter this Lease shall continue as a direct Lease between such party, as “Landlord”, and
Tenant, as “Tenant”, subject, however, to the provisions of Section 18.3 below. Tenant shall send to each Mortgagee (after notification of the
identity of such Mortgagee and the mailing address thereof) copies of all notices that Tenant sends to Landlord pursuant to this Lease; such
notices  to  such  Mortgagee  shall  be  sent  concurrently  with  the  sending  of  the  notices  to  Landlord  and  in  the  same  manner  as  notices  are
required to be sent pursuant to Section 24.14 below. Tenant will accept performance of any provision of this Lease by such Mortgagee as
performance by, and with the same force and effect as though performed by, Landlord. If any act or omission of Landlord would give Tenant
the right, immediately or after lapse of a period of time, to cancel or terminate this Lease, or to claim a partial or total eviction, Tenant shall
not exercise such right until (A) Tenant gives notice of such act or omission to Landlord and to each such Mortgagee, and (B) a reasonable
period of time for remedying such act or omission elapses following the time when such Mortgagee becomes entitled under such Mortgage to
remedy same (which reasonable period shall in no event be less than the period to which Landlord is entitled under this Lease or otherwise,
after similar notice, to effect such remedy and which reasonable period shall take into account such time as shall be required to institute and
complete any foreclosure proceedings).

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18.3

Lender  Protections.  Notwithstanding  anything  to  the  contrary  in  this  Lease,  any  party  that  becomes  owner  of  the
Building and/or Project ("Successor Landlord") as a result of (i) foreclosure under any Mortgage, (ii) any other exercise by Mortgagee of
rights  and  remedies  (whether  under  any  Mortgage  or  under  applicable  law,  including  bankruptcy  law)  as  holder  of  a  Mortgage,  or  (iii)
delivery by Landlord to a Mortgagee (or its designee or nominee) of a deed or other conveyance of Landlord's interest in the Building and/or
Project in lieu of any of the foregoing, shall not be liable for or bound by any of the following matters:

(A)

any right of Tenant to any offset, defense, claim, counterclaim, reduction, deduction, or abatement against
Tenant's payment of rent or performance of Tenant's other obligations under this Lease, arising (whether under this Lease or under applicable
law) from Landlord's breach or default under this Lease ("Offset Right") that Tenant may have against Landlord or any other party that was
landlord  under  this  Lease  at  any  time  before  the  occurrence  of  any  attornment  by  Tenant  to  the  Successor  Landlord  (each,  a  "Former
Landlord") relating to any event or occurrence before the date of such attornment, including any claim for damages of any kind whatsoever
as  the  result  of  any  breach  by  Former  Landlord  that  occurred  before  the  date  of  such  attornment.  The  foregoing  shall  not,  however,  limit
either (1) Tenant’s right to exercise against Successor Landlord any Offset Right otherwise available to Tenant because of events occurring
after  the  date  of  such  attornment,  or  (2)  Successor  Landlord’s  obligation  to  correct  any  conditions  that  existed  as  of  the  date  of  such
attornment and violate Successor Landlord’s obligations as successor landlord under this Lease;

actually delivered to Successor Landlord;

(B)

any  obligation  with  respect  to  any  security  deposited  with  Former  Landlord,  unless  such  security  was

(C)
rehabilitation of existing improvements thereon;

to  commence  or  complete  any  initial  construction  of  improvements  in  the  Premises  or  any  expansion  or

or condemnation;

(D)

to reconstruct or repair improvements to the Premises, the Building and/or the Project following a Casualty

(E)
and warranties by or related to Former Landlord;

any  offset,  defense,  claim,  counterclaim,  reduction,  deduction,  or  abatement  arising  from  representations

Mortgagee’s written consent;

(F)

any  modification  or  amendment  of  this  Lease,  or  any  waiver  of  the  terms  of  this  Lease,  made  without

agreed upon between Landlord and Tenant, unless effected unilaterally by Tenant pursuant to the express terms of this Lease;

(G)

any  consensual  or  negotiated  surrender,  cancellation,  or  termination  of  this  Lease,  in  whole  or  in  part,

any payment of rent that Tenant may have made to Former Landlord more than thirty (30) days before the
date such rent was first due and payable under this Lease with respect to any period after the date of such attornment other than, and only to
the extent that, this Lease expressly required such a prepayment; and

(H)

actually delivered to Successor Landlord by way of an assumption of escrow accounts or otherwise.

(I)

to pay Tenant any sum(s) that any Former Landlord owed to Tenant unless such sums, if any, shall have been

ARTICLE 19

DEFAULTS; REMEDIES

19.1

Defaults. All covenants and agreements to be kept or performed by Tenant under this Lease shall be performed by
Tenant at Tenant's sole cost and expense and without any reduction of Rent. The occurrence of any of the following shall constitute a default
of this Lease by Tenant:

part thereof, within five (5) business days after receipt of written notice of delinquency therefor;

19.1.1

Any failure by Tenant to pay any Rent or any other charge required to be paid under this Lease, or any

The failure by Tenant to observe or perform according to the provisions of Articles 5, 10, 14, 17 or 18 of
this  Lease,  or  any  breach  by  Tenant  of  any  representations  and  warranties  set  forth  in  this  Lease,  where,  in  each  instance,  such  failure
continues for more than five (5) days after notice from Landlord;

19.1.2

19.1.3

The making by Tenant of any Transfer, except as expressly permitted in Article 14 above;

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19.1.4

If: (i) Tenant, or any guarantor of Tenant's obligations under this Lease ("Guarantor") admits in writing
that  it  cannot  meet  its  obligations  as  they  become  due;  (ii)  Tenant,  or  any  Guarantor  is  declared  insolvent  according  to  any  law;  (iii)
assignment  of  Tenant's  or  Guarantor's  property  is  made  for  the  benefit  of  creditors;  (iv)  a  receiver  or  trustee  is  appointed  for  Tenant  or
Guarantor or its property; (v) the interest of Tenant or Guarantor under this Lease is levied on under execution or other legal process; (vi) any
petition is filed by or against Tenant or Guarantor to declare Tenant and/or Guarantor bankrupt or to delay, reduce or modify Tenant's and/or
Guarantor's debts or obligations; or (vii) any petition is filed or other action taken to reorganize or modify Tenant's or Guarantor's capital
structure, if Tenant or Guarantor is a corporation or other entity; any such levy, execution, legal process or petition filed against Tenant  or
Guarantor  shall  not  constitute  a  breach  of  this  Lease  provided  Tenant  or  Guarantor  shall  vigorously  contest  the  same  by  appropriate
proceedings and shall remove or vacate the same within sixty (60) days from the date of its creation, service or filing; or

19.1.5

Any failure by Tenant to observe or perform any other provision, covenant or condition of this Lease to
be observed or performed by Tenant where such failure continues for thirty (30) days after written notice thereof from Landlord to Tenant;
provided  however,  that  any  such  notice  shall  be  in  lieu  of,  and  not  in  addition  to,  any  notice  required  under  California  Code  of  Civil
Procedure Section 1161 or any similar or successor law, and may be served on Tenant in the manner allowed for service of notices under this
Lease; and provided further that if the nature of such default is such that the same cannot reasonably be cured within a thirty (30)) day period,
Tenant  shall  not  be  deemed  to  be  in  default  if  it  diligently  commences  such  cure  within  such  period  and  thereafter  diligently  proceeds  to
rectify and cure said default, as soon as possible.

19.2

Remedies Upon Default. Upon the occurrence of such default by Tenant, Landlord shall have, in addition to any other
remedies available to Landlord at law or in equity, the option to pursue any one or more of the following remedies, each and all of which
shall be cumulative and nonexclusive, without any notice or demand whatsoever.

19.2.1

Terminate this Lease, in which event Tenant shall immediately surrender the Premises to Landlord, and if
Tenant fails to do so, Landlord may, without prejudice to any other remedy which it may have for possession or arrearages in rent, enter upon
and  take  possession  of  the  Premises  and  expel  or  remove  Tenant  and  any  other  person  who  may  be  occupying  the  Premises  or  any  part
thereof, without being liable for prosecution or any claim or damages therefor; and Landlord may recover from Tenant the following:

termination; plus

(i)

the  worth  at  the  time  of  award  of  any  unpaid  rent  which  has  been  earned  at  the  time  of  such

the worth at the time of award of the amount by which the unpaid rent which would have been
earned  after  termination  until  the  time  of  award  exceeds  the  amount  of  such  rental  loss  that  Tenant  proves  could  have  been  reasonably
avoided; plus

(ii)

Lease Term after the time of award exceeds the amount of such rental loss that Tenant proves could have been reasonably avoided; plus

(iii)

the  worth  at  the  time  of  award  of  the  amount  by  which  the  unpaid  rent  for  the  balance  of  the

any other amount necessary to compensate Landlord for all the detriment proximately caused by
Tenant's  failure  to  perform  its  obligations  under  this  Lease  or  which  in  the  ordinary  course  of  things  would  be  likely  to  result  therefrom,
specifically including but not limited to, brokerage commissions and advertising expenses incurred, expenses of remodeling the Premises or
any portion thereof for a new tenant, whether for the same or a different use, and any special concessions made to obtain a new tenant; plus

(iv)

permitted from time to time by applicable law.

(v)

at  Landlord's  election,  such  other  amounts  in  addition  to  or  in  lieu  of  the  foregoing  as  may  be

The  term  "rent"  as  used  in  this  Section 19.2  shall  be  deemed  to  be  and  to  mean  all  sums  of  every  nature  required  to  be  paid  by  Tenant
pursuant to the terms of this Lease, whether to Landlord or to others. As used in Sections 19.2.1(i) and (ii), above, the "worth at the time of
award" shall be computed by allowing interest at the Interest Rate set forth in Section 4.2.3 above, but in no case greater than the maximum
amount  of  such  interest  permitted  by  law.  As  used  in  Section  19.2.1(iii)  above,  the  "worth  at  the  time  of  award"  shall  be  computed  by
discounting such amount at the discount rate of the Federal Reserve Bank of San Francisco at the time of award plus one percent (1%).

Landlord shall have the remedy described in California Civil Code Section 1951.4 (lessor may continue
lease in effect after lessee's breach and abandonment and recover rent as it becomes due, if lessee has the right to sublet or assign, subject
only to reasonable limitations). Accordingly, if Landlord does not elect to terminate this Lease on account of any default by Tenant,

19.2.2

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Landlord may, from time to time, without terminating this Lease, enforce all of its rights and remedies under this Lease, including the right to
recover all rent as it becomes due.

19.2.3

Landlord may, but shall not be obligated to, make any such payment or perform or otherwise cure any
such  obligation,  provision,  covenant  or  condition  on  Tenant's  part  to  be  observed  or  performed  (and  may  enter  the  Premises  for  such
purposes). In the event of Tenant's failure to perform any of its obligations or covenants under this Lease, and such failure to perform poses a
material risk of injury or harm to persons or damage to or loss of property, then Landlord shall have the right to cure or otherwise perform
such covenant or obligation at any time after such failure to perform by Tenant, whether or not any such notice or cure period set forth in
Section 19.1 above has expired. Any such actions undertaken by Landlord pursuant to the foregoing provisions of this Section 19.2.3 shall
not be deemed a waiver of Landlord's rights and remedies as a result of Tenant's failure to perform and shall not release Tenant from any of
its obligations under this Lease.

19.3

Payment  by  Tenant.  Tenant  shall  pay  to  Landlord,  within  ten  (10)  days  after  delivery  by  Landlord  to  Tenant  of
statements  therefor:  (i)  sums  equal  to  expenditures  reasonably  made  and  obligations  incurred  by  Landlord  in  connection  with  Landlord's
performance or cure of any of Tenant's obligations pursuant to the provisions of Section 19.2.3 above; and (ii) sums equal to all expenditures
made and obligations incurred by Landlord in collecting or attempting to collect the Rent or in enforcing or attempting to enforce any rights
of  Landlord  under  this  Lease  or  pursuant  to  law,  including,  without  limitation,  all  legal  fees  and  other  amounts  so  expended.  Tenant's
obligations under this Section 19.3 shall survive the expiration or sooner termination of the Lease Term.

19.4

Subleases of Tenant. Whether or not Landlord elects to terminate this Lease on account of any default by Tenant, as
set forth in this Article 19, following any such default by Tenant, Landlord shall have the right to terminate any and all subleases, licenses,
concessions or other consensual arrangements for possession entered into by Tenant and affecting the Premises or may, in Landlord's sole
discretion,  succeed  to  Tenant's  interest  in  such  subleases,  licenses,  concessions  or  arrangements.  If  Landlord  elects  to  succeed  to  Tenant's
interest in any such subleases, licenses, concessions or arrangements, Tenant shall, as of the date of notice by Landlord of such election, have
no further right to or interest in the rent or other consideration receivable thereunder.

19.5

Waiver of Default. No waiver by Landlord of any violation or breach by Tenant of any of the terms, provisions and
covenants herein contained shall be deemed or construed to constitute a waiver of any other or later violation or breach by Tenant of the same
or  any  other  of  the  terms,  provisions,  and  covenants  herein  contained.  Forbearance  by  Landlord  in  enforcement  of  one  or  more  of  the
remedies herein provided upon a default by Tenant shall not be deemed or construed to constitute a waiver of such default. The acceptance of
any Rent hereunder by Landlord following the occurrence of any default, whether or not known to Landlord, shall not be deemed a waiver of
any such default, except only a default in the payment of the Rent so accepted.

19.6

Efforts to Relet.  For  the  purposes  of  this  Article 19,  Tenant's  right  to  possession  shall  not  be  deemed  to  have  been
terminated  by  efforts  of  Landlord  to  relet  the  Premises,  by  its  acts  of  maintenance  or  preservation  with  respect  to  the  Premises,  or  by
appointment of a receiver to protect Landlord's interests hereunder. The foregoing enumeration is not exhaustive, but merely illustrative of
acts which may be performed by Landlord without terminating Tenant's right to possession.

19.7

Landlord's Default. If Landlord shall fail to perform any term or provision under this Lease required to be performed
by Landlord, Landlord shall not be deemed to be in default hereunder nor subject to any claims for damages of any kind, unless such failure
shall have continued for a period of thirty (30) days after written notice thereof by Tenant; provided, if the nature of Landlord's failure is such
that more than thirty (30) days are reasonably required in order to cure, Landlord shall not be in default if Landlord commences to cure such
failure  within  such  thirty  (30)  day  period,  and  thereafter  reasonably  seeks  to  cure  such  failure  to  completion.  Upon  any  such  default  by
Landlord  under  this  Lease,  Tenant  may,  except  as  otherwise  specifically  provided  in  this  Lease  to  the  contrary,  exercise  any  of  its  rights
provided at law or in equity (but Tenant shall not be entitled to recover any lost profits, loss of business or other consequential damages and
in any event, Landlord's liability or obligations with respect to any such remedy shall be limited as provided in Section 24.10);  provided,
however, in recognition that Landlord must receive timely payments of Rent and operate the Project, Tenant shall have no right of self-help to
perform repairs or any other obligation of Landlord, and shall have no right to withhold, set-off, or abate Rent (except as otherwise expressly
provided in this Lease).

ARTICLE 20

SECURITY DEPOSIT

Concurrent with Tenant's execution of this Lease, Tenant shall deposit with Landlord a security deposit (the "Security Deposit") in

the amount set forth in Section 10 of the Summary. The Security

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Deposit shall be held by Landlord as security for the faithful performance by Tenant of all the terms, covenants, and conditions of this Lease
to be kept and performed by Tenant during the Lease Term. If Tenant defaults with respect to any provisions of this Lease, including, but not
limited to, the provisions relating to the payment of Rent, Landlord may, but shall not be required to, use, apply or retain all or any part of the
Security Deposit for the payment of any Rent or any other sum in default, or for the payment of any amount that Landlord may spend or
become obligated to spend by reason of Tenant's default, or to compensate Landlord for any other loss or damage that Landlord may suffer
by reason of Tenant's default. If any portion of the Security Deposit is so used or applied, Tenant shall, within ten (10) business days after
written  demand  therefor,  deposit  cash  with  Landlord  in  an  amount  sufficient  to  restore  the  Security  Deposit  to  its  original  amount,  and
Tenant's failure to do so shall be a default under this Lease. If Tenant shall fully and faithfully perform every provision of this Lease to be
performed  by  it,  the  Security  Deposit,  or  any  balance  thereof,  shall  be  returned  to  Tenant,  or,  at  Landlord's  option,  to  the  last  assignee  of
Tenant's  interest  hereunder,  within  sixty  (60)  days  following  the  expiration  of  the  Lease  Term.  Landlord  shall  not  be  required  to  keep  the
Security  Deposit  in  a  separate  account  and  Tenant  shall  not  be  entitled  to  any  interest  on  the  Security  Deposit.  Tenant  hereby  waives  the
provisions  of  Section  1950.7  of  the  California  Civil  Code,  and  all  other  provisions  of  law,  now  or  hereafter  in  force,  which  provide  that
Landlord  may  claim  from  a  security  deposit  only  those  sums  reasonably  necessary  to  remedy  defaults  in  the  payment  of  rent,  to  repair
damage caused by Tenant or to clean the Premises, it being agreed that Landlord may, in addition, claim those sums reasonably necessary to
compensate  Landlord  for  any  other  loss  or  damage,  foreseeable  or  unforeseeable,  caused  by  the  act  or  omission  of  Tenant  or  any  officer,
employee, agent or invitee of Tenant.

ARTICLE 21

COMPLIANCE WITH LAW

21.1

Compliance with Law. Tenant shall not do anything or suffer anything to be done in or about the Premises which will
in any way violate any law, statute, ordinance or other rule, directive, order, regulation, guideline, or requirement of any governmental entity
or governmental agency now in force or which may hereafter be enacted or promulgated. At its sole cost and expense, Tenant shall promptly
comply with all applicable laws that pertain to Tenant or its use of the Premises (including applicable laws pertaining to Hazardous Materials
and applicable laws pertaining to Tenant's use of the Premises, whether or not Tenant’s compliance will necessitate expenditures or interfere
with its use and enjoyment of the Premises, including ceasing or reducing Tenant's business operations in or Tenant's use of, the Premises),
subject  to  Landlord's  obligation  as  set  forth  hereinbelow  to  comply  with  applicable  laws  with  respect  to  those  items  of  the  Building  and
Project that are Landlord's obligation to repair as set forth in Section 7.2 above. In addition, Tenant shall fully comply with all present or
future programs intended to manage parking, transportation or traffic in and around the Project, and in connection therewith, Tenant shall
take responsible action for the transportation planning and management of all employees located at the Premises by working directly with
Landlord,  any  governmental  transportation  management  organization  or  any  other  transportation-related  committees  or  entities.  The
judgment of any court of competent jurisdiction or the admission of Tenant in any judicial action, regardless of whether Landlord is a party
thereto,  that  Tenant  has  violated  any  of  said  governmental  measures,  shall  be  conclusive  of  that  fact  as  between  Landlord  and  Tenant.
Landlord shall comply with all applicable laws relating to those items of the Building and Project that are Landlord's obligation to repair as
set forth in Section 7.2 above. Notwithstanding the foregoing, to the extent Landlord's compliance obligations (including any obligations to
correct violations of construction-related accessibility standards described in Section 21.2 below) in the immediately preceding sentence are
triggered  by  any  improvements  or  Alterations  made  to  the  Premises  by  or  on  behalf  of  Tenant,  Tenant's  particular  manner  of  use  of  the
Premises, and/or Tenant's installation of any trade fixtures, furniture, equipment or personal property in the Premises, Tenant shall reimburse
Landlord for the reasonable cost of such compliance within ten (10) business days after Tenant's receipt of an invoice therefor from Landlord.

21.2

CASp. For purposes of Section 1938(a) of the California Civil Code, Landlord hereby discloses to Tenant, and Tenant
hereby acknowledges, that the Premises have not undergone inspection by a Certified Access Specialist (CASp). In addition, the following
notice is hereby provided pursuant to Section 1938(e) of the California Civil Code: "A Certified Access Specialist (CASp) can inspect the
subject premises and determine whether the subject premises comply with all of the applicable construction-related accessibility standards
under state law. Although state law does not require a CASp inspection of the subject premises, the commercial property owner or lessor may
not prohibit the lessee or tenant from obtaining a CASp inspection of the subject premises for the occupancy or potential occupancy of the
lessee or tenant, if requested by the lessee or tenant. The parties shall mutually agree on the arrangements for the time and manner of the
CASp  inspection,  the  payment  of  the  fee  for  the  CASp  inspection,  and  the  cost  of  making  any  repairs  necessary  to  correct  violations  of
construction-related accessibility standards within the premises." In furtherance of and in connection with such notice: (i) Tenant, having read
such notice and understanding Tenant's right to request and obtain a CASp inspection and with advice of counsel, hereby elects not to obtain
such CASp inspection and forever waives its rights to obtain a CASp inspection with respect to the Premises, Building and/or Project to the
extent permitted

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by applicable laws now or hereafter in effect; and (ii) if the waiver set forth in clause (i) hereinabove is not enforceable pursuant to applicable
laws now or hereafter in effect, then Landlord and Tenant hereby agree as follows (which constitute the mutual agreement of the parties as to
the matters described in the last sentence of the foregoing notice): (A) Tenant shall have the one-time right to request for and obtain a CASp
inspection, which request must be made, if at all, in a written notice delivered by Tenant to Landlord on or before the Lease Commencement
Date;  (B)  any  CASp  inspection  timely  requested  by  Tenant  shall  be  conducted  (1)  between  the  hours  of  9:00  a.m.  and  5:00  p.m.  on  any
business day, (2) only after ten (10) days' prior written notice to Landlord of the date of such CASp inspection, (3) in a professional manner
by  a  CASp  designated  by  Landlord  and  without  any  testing  that  would  damage  the  Premises,  Building  or  Project  in  any  way,  and  (4)  at
Tenant's sole cost and expense, including, without limitation, Tenant's payment of the fee for such CASp inspection, the fee for any reports
prepared  by  the  CASp  in  connection  with  such  CASp  inspection  (collectively,  the  "CASp  Reports")  and  all  other  costs  and  expenses  in
connection therewith; (C) Tenant shall deliver a copy of any CASp Reports to Landlord within two (2) business days after Tenant's receipt
thereof; (D) Tenant, at its sole cost and expense, shall be responsible for making any improvements, alterations, modifications and/or repairs
to  or  within  the  Premises  to  correct  violations  of  construction-related  accessibility  standards  including,  without  limitation,  any  violations
disclosed by such CASp inspection; and (E) if such CASp inspection identifies any improvements, alterations, modifications and/or repairs
necessary  to  correct  violations  of  construction-related  accessibility  standards  relating  to  those  items  of  the  Building  and  Project  located
outside  the  Premises  that  are  Landlord's  obligation  to  repair  as  set  forth  in  Section  7.2  above,  then  Landlord  shall  perform  such
improvements, alterations, modifications and/or repairs as and to the extent required by applicable laws to correct such violations, and Tenant
shall  reimburse  Landlord  for  the  cost  of  such  improvements,  alterations,  modifications  and/or  repairs  within  ten  (10)  business  days  after
Tenant's receipt of an invoice therefor from Landlord.

ARTICLE 22

ENTRY BY LANDLORD

Landlord reserves the right at all reasonable times and upon at least twenty-four (24) hours’ prior notice to Tenant (provided that
no such notice shall be required in the event of an emergency or to provide regularly scheduled services) to enter the Premises to: (i) inspect
them; (ii) show the Premises to prospective purchasers, mortgagees or ground lessors, or, during the last twelve (12) months of the Lease
Term (as may be extended), prospective tenants; (iii) post notices of non-responsibility; or (iv) alter, improve or repair the Premises or the
Building if necessary to comply with current building codes or other applicable laws, or for structural alterations, repairs or improvements to
the Building, or as Landlord may otherwise reasonably desire or deem necessary. Notwithstanding anything to the contrary contained in this
Article 22, Landlord may enter the Premises at any time, without notice to Tenant, in emergency situations and/or to perform janitorial and
other  services  required  of  Landlord.  Any  such  entries  shall  be  without  the  abatement  of  Rent  and  shall  include  the  right  to  take  such
reasonable steps as required to accomplish the stated purposes; provided, however, that any such entry shall be accomplished as expeditiously
as reasonably possible and in a manner so as to cause as little interference to Tenant as reasonably possible. Tenant hereby waives any claims
for  damages  or  for  any  injuries  or  inconvenience  to  or  interference  with  Tenant's  business,  lost  profits,  any  loss  of  occupancy  or  quiet
enjoyment of the Premises, and any other loss occasioned by Landlord's entry into the Premises. For each of the above purposes, Landlord
shall at all times have a key with which to unlock all the doors in the Premises, excluding Tenant's vaults, safes and special security areas
designated in advance by Tenant. In an emergency, Landlord shall have the right to use any means that Landlord may deem proper to open
the doors in and to the Premises. Any entry into the Premises by Landlord in the manner hereinbefore described shall not be deemed to be a
forcible  or  unlawful  entry  into,  or  a  detainer  of,  the  Premises,  or  an  actual  or  constructive  eviction  of  Tenant  from  any  portion  of  the
Premises.

ARTICLE 23

TENANT PARKING

Tenant  shall  rent  throughout  the  Lease  Term  the  number  of  unreserved  parking  spaces  set  forth  in  Section 11  of  the  Summary,
located in those portions of the Parking Facilities specified in Section 11 of the Summary. Such parking spaces shall be located in such areas
of such Parking Facilities as shall be designated by Landlord from time to time for parking by tenants of the Building and/or Project. All of
such parking privileges shall be provided by Landlord, or at the option of Landlord, through a parking operator designated by Landlord (the
parking  operator  so  designated  by  Landlord  shall  be  referred  to  herein  as  the  "Parking  Operator"),  and  Landlord  may  delegate  its
responsibilities under this Article 23 to the Parking Operator in which case the Parking Operator shall have all rights of control attributed by
this Article 23 to Landlord. Tenant shall not be obligated to pay any parking charges for the unreserved parking spaces rented by Tenant.
Tenant's  continued  right  to  use  the  unreserved  parking  spaces  is  conditioned  upon  Tenant  abiding  by  the  Parking  Rules  and  Regulations
which are in effect on the date hereof, as set forth in the attached Exhibit B and all modifications and additions thereto which are

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prescribed from time to time for the orderly operation and use of the Parking Facilities by Landlord and/or Landlord's Parking Operator and
upon Tenant's cooperation in seeing that Tenant's employees and visitors also comply with the Parking Rules and Regulations (and all such
modifications and additions thereto, as the case may be). In addition, Landlord (or the Parking Operator, if so designated by Landlord) may
assign  any  parking  spaces  and/or  make  all  or  a  portion  of  such  spaces  reserved  or  institute  an  attendant-assisted  tandem  parking  program
and/or valet parking program if Landlord (or the Parking Operator, if so designated by Landlord) determines in its sole discretion that such is
necessary  or  desirable  for  orderly  and  efficient  parking.  Landlord  (or  the  Parking  Operator,  if  so  designated  by  Landlord)  specifically
reserves the right, from time to time, to change the size, configuration, design, layout, location and all other aspects of the Parking Facilities,
and Tenant acknowledges and agrees that Landlord (or the Parking Operator, if so designated by Landlord), from time to time, may, without
incurring any liability to Tenant and without any abatement of Rent under this Lease temporarily close-off or restrict access to any of the
Parking Facilities, or temporarily relocate Tenant's parking spaces to other parking facilities within a reasonable distance from the Parking
Facilities,  for  purposes  of  permitting  or  facilitating  any  such  construction,  alteration  or  improvements  or  to  accommodate  or  facilitate
renovation,  alteration,  construction  or  other  modification  of  other  improvements  or  structures  located  on  the  Project.  The  parking  spaces
provided to Tenant pursuant to this Article 23 are provided solely for use by Tenant's own personnel and such spaces may not be transferred,
assigned, subleased or otherwise alienated by Tenant without Landlord's prior approval.

ARTICLE 24

MISCELLANEOUS PROVISIONS

24.1

Binding Effect. Each of the provisions of this Lease shall extend to and shall, as the case may require, bind or inure to
the benefit not only of Landlord and of Tenant, but also of their respective successors or assigns, provided this clause shall not permit any
assignment by Tenant contrary to the provisions of Article 14 above.

24.2

Tenant's Signs.

24.2.1

Identification Signs. Tenant shall be entitled, at Landlord’s cost, to: (i) one (1) identification sign on or
near the entry doors of the Premises; and (ii) one (1) identification or directional sign, as designated by Landlord, in the elevator lobby on the
floor  on  which  the  Premises  are  located  (collectively,  the  “Identification  Signs”).  The  Identification  Signs  shall  be  installed  by  a  signage
contractor designated by Landlord. Landlord shall be responsible for the costs of the initial installation of the Identification Signs and any
subsequent changes and modifications thereto shall be at Tenant’s cost and subject to Landlord’s prior written approval. The location, quality,
design, style, lighting and size of the Identification Signs shall be consistent with the Landlord's Building standard signage program and shall
be subject to Landlord's prior written approval. Upon the expiration or earlier termination of this Lease, Tenant shall be responsible, at its
sole cost and expense, for the removal of the Identification Signs and the repair of all damage to the Building caused by such removal. Except
for the Identification Signs and Tenant’s Monument Sign (as defined below), Tenant may not install any signs on the exterior or roof of the
Building and/or the Additional Buildings or the common areas of the Building, the Additional Buildings or the Project. Any signs, window
coverings, or blinds (even if the same are located behind the Landlord approved window coverings for the Building), or other items visible
from the exterior of the Premises or Building are subject to the prior approval of Landlord, in its sole and absolute discretion.

24.2.2

Tenant’s  Monument  Sign.  Subject  to  the  approval  of  all  applicable  governmental  authorities,  and
compliance  with  all  applicable  laws,  Landlord's  signage  program  for  the  Project  and  all  recorded  covenants,  conditions  and  restrictions
affecting the Project, and the terms of this Section 24.2.2, Tenant shall have the non-exclusive right to display Tenant's trade name "Sierra
Oncology", but no other markings ("Tenant's Monument Sign"), displayed on one (1) strip of that certain existing monument sign located in
front of the Building (the "Signage Monument"). The graphics, materials, color, design, lettering, size, specifications, lighting and manner of
affixing Tenant’s Monument Sign shall be subject to Landlord's reasonable approval. Tenant shall pay for all costs and expenses related to
Tenant’s  Monument  Sign,  including,  without  limitation,  the  design,  construction,  installation,  maintenance,  insurance,  utilities,  repair  and
replacement of Tenant’s Monument Sign. In addition, Tenant shall pay to Landlord, within ten (10) days after demand, from time to time, all
other actual out-of-pocket costs attributable to the fabrication, insurance, maintenance and repair of Tenant's Monument Sign on the Signage
Monument plus a pro-rata share (determined by Landlord based upon the number of tenant signs on the Signage Monument) of the costs of
maintenance,  insurance,  and  repair  of  the  Signage  Monument.  Landlord  shall  have  the  right  to  relocate,  redesign  and/or  reconstruct  the
Signage Monument from time to time. Tenant shall install and maintain Tenant’s Monument Sign in compliance with all applicable laws and
subject to the applicable provisions of Articles 7 and 8 above. Tenant shall be responsible for maintaining insurance on Tenant’s Monument
Sign  as  part  of  the  insurance  required  to  be  carried  by  Tenant  pursuant  to  Section  10.3.2  above.  If  Tenant’s  Monument  Sign  requires
maintenance, repairs and/or replacement as determined in Landlord's reasonable judgment, Landlord shall have the right to provide written
notice thereof to

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Tenant and Tenant shall cause such repairs, replacement and/or maintenance to be performed within ten (10) days after receipt of such notice
from  Landlord,  at  Tenant's  sole  cost  and  expense;  provided,  however,  if  such  repairs,  replacement  and/or  maintenance  are  reasonably
expected to require longer than ten (10) days to perform, Tenant shall commence such repairs, replacement and/or maintenance within such
ten (10) day period and shall diligently prosecute such repairs, replacement and maintenance to completion. If Tenant fails to perform such
maintenance, repairs and/or replacement within the periods described in the immediately preceding sentence, then Landlord shall have the
right to cause such work to be performed and to charge Tenant as Additional Rent for the costs of such work, including interest at the Interest
Rate.  Upon  the  expiration  or  earlier  termination  of  this  Lease  (or  prior  to  such  expiration  or  earlier  termination,  upon  Tenant's  loss  of  its
rights to Tenant’s Monument Sign pursuant to this Section 24.2.2 hereinbelow) Tenant shall, at Tenant's sole cost and expense, cause Tenant’s
Monument Sign to be removed from the Signage Monument, and Tenant shall repair all damage occasioned thereby and restore the affected
areas  to  their  original  condition  prior  to  the  installation  of  Tenant’s  Monument  Sign  so  required  to  be  removed.  If  Tenant  fails  to  timely
remove Tenant’s Monument Sign and repair and restore the affected areas as provided in the immediately preceding sentence, then Landlord
may  perform  such  work,  and  all  costs  and  expenses  incurred  by  Landlord  in  so  performing  such  work  shall  be  reimbursed  by  Tenant  to
Landlord within thirty (30) days after Tenant's receipt of invoice therefor including interest at the Interest Rate. The immediately preceding
sentence shall survive the expiration or earlier termination of this Lease. The rights to Tenant’s Monument Sign are personal to the original
Tenant executing this Lease (the “Original Tenant”) and may not be transferred by the Original Tenant or used by anyone else. In addition,
following the Possession Date, the Original Tenant shall only have such rights to Tenant’s Monument Sign when the Original Tenant is in
actual and physical possession of the entire Premises.

24.3

Modification  of  Lease.  If  any  current  or  prospective  mortgagee  or  ground  lessor  for  the  Project  requires  any
modifications to this Lease, which modifications will not cause an increased cost or expense to Tenant or in any other way materially and
adversely change the rights and obligations of Tenant hereunder, then and in such event, Tenant agrees that this Lease may be so modified
and agrees to execute whatever documents are required therefor and deliver the same to Landlord within ten (10) days following the request
therefor, provided that Landlord shall reimburse Tenant for all actual -out-of-pocket legal fees incurred in connection with the same in an
amount of up to, but not exceeding $2,500.00. If Landlord or any such current or prospective mortgagee or ground lessor require execution of
a short form of Lease for recording, containing, among other customary provisions, the names of the parties, a description of the Premises
and the Lease Term, Tenant shall execute such short form of Lease and to deliver the same to Landlord within ten (10) days following the
request therefor, provided that Landlord shall reimburse Tenant for all actual -out-of-pocket legal fees incurred in connection with the same
in an amount of up to, but not exceeding $2,500.00.

24.4

Transfer of Landlord's Interest. Landlord has the right to transfer all or any portion of its interest in the Project and/or
this Lease, and upon any such transfer and a transfer of the Security Deposit, Landlord shall automatically be released from all liability under
this Lease and Tenant shall look solely to such transferee for the performance of Landlord's obligations hereunder after the date of transfer.
Landlord may also assign its interest in this Lease to the holder of any mortgage or deed of trust as additional security, but such assignment
shall not release Landlord from its obligations hereunder and Tenant shall continue to look to Landlord for the performance of its obligations
hereunder.

24.5

Prohibition Against Recording. Except as provided in Section 24.3 above, neither this Lease, nor any memorandum,
affidavit or other writing with respect thereto, shall be recorded by Tenant or by anyone acting through, under or on behalf of Tenant, and the
recording thereof in violation of this provision shall, at Landlord's election, constitute a non-curable default by Tenant under this Lease, the
occurrence of which shall, in addition to Landlord's other rights and remedies, entitle Landlord to terminate this Lease at Landlord's election
(pursuant to and in accordance with Section 19.2 above).

24.6

Captions. The captions of Articles and Sections are for convenience only and shall not be deemed to limit, construe,

affect or alter the meaning of such Articles and Sections.

24.7

Relationship of Parties. Nothing contained in this Lease shall be deemed or construed by the parties hereto or by any
third party to create the relationship of principal and agent, partnership, joint venturer or any association between Landlord and Tenant, it
being expressly understood and agreed that neither the method of computation of Rent nor any act of the parties hereto shall be deemed to
create any relationship between Landlord and Tenant other than the relationship of landlord and tenant.

24.8

Time of Essence. Time is of the essence of this Lease and each of its provisions.

24.9

Partial  Invalidity.  If  any  term,  provision  or  condition  contained  in  this  Lease  shall,  to  any  extent,  be  invalid  or
unenforceable, the remainder of this Lease, or the application of such term, provision or condition to persons or circumstances other than
those  with  respect  to  which  it  is  invalid  or  unenforceable,  shall  not  be  affected  thereby,  and  each  and  every  other  term,  provision  and
condition of this Lease shall be valid and enforceable to the fullest extent possible permitted by law.

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24.10

Landlord Exculpation. Notwithstanding anything in this Lease to the contrary, and notwithstanding any applicable
law to the contrary, the liability of Landlord and the Landlord Parties under this Lease (including any successor landlord) and any recourse by
Tenant  against  Landlord  or  the  Landlord  Parties  (including  any  successor  landlord)  shall  be  limited  solely  and  exclusively  to  an  amount
which  is  equal  to  the  interest  of  Landlord  in  the  Project,  and  neither  Landlord,  nor  any  of  the  Landlord  Parties  shall  have  any  personal
liability  therefor,  and  Tenant  hereby  expressly  waives  and  releases  such  personal  liability  on  behalf  of  itself  and  all  persons  claiming  by,
through or under Tenant.

24.11

Entire  Agreement.  There  are  no  oral  agreements  between  the  parties  hereto  affecting  this  Lease  and  this  Lease
supersedes  and  cancels  any  and  all  previous  negotiations,  arrangements,  brochures,  agreements  and  understandings,  if  any,  between  the
parties hereto or displayed by Landlord to Tenant with respect to the subject matter thereof, and none thereof shall be used to interpret or
construe this Lease. This Lease, the exhibits and schedules attached hereto, and any side letter or separate agreement executed by Landlord
and  Tenant  in  connection  with  this  Lease  and  dated  of  even  date  herewith  contain  all  of  the  terms,  covenants,  conditions,  warranties  and
agreements  of  the  parties  relating  in  any  manner  to  the  rental,  use  and  occupancy  of  the  Premises,  shall  be  considered  to  be  the  only
agreement between the parties hereto and their representatives and agents, and none of the terms, covenants, conditions or provisions of this
Lease can be modified, deleted or added to except in writing signed by the parties hereto.

24.12

Right  to  Lease.  Landlord  reserves  the  absolute  right  to  effect  such  other  tenancies  in  the  Building  and  Additional
Buildings as Landlord in the exercise of its sole business judgment shall determine to best promote the interests of the Project. Tenant does
not rely on the fact, nor does Landlord represent, that any specific tenant or type or number of tenants shall, during the Lease Term, occupy
any space in the Building, the Additional Buildings or the Project.

24.13

Force Majeure. Notwithstanding anything to the contrary contained in this Lease, any prevention, delay or stoppage
due to strikes, lockouts, labor disputes, acts of God, acts of war, terrorist acts, inability to obtain services, labor, or materials or reasonable
substitutes  therefor,  governmental  actions,  governmental  laws,  regulations  or  restrictions,  civil  commotions,  Casualty,  actual  or  threatened
public health emergency (including, without limitation, epidemic, pandemic, famine, disease, plague, quarantine, and other significant public
health risk), governmental edicts, actions, orders, declarations or restrictions (including (i) any states of emergency and quarantines imposed
by a governmental entity or agency, and (ii) any government imposed shelter-in-place orders, stay at home orders and/or restrictions on travel
related thereto that preclude Tenant, or Landlord, their agents, contractors or employees from accessing the Premises, as applicable), breaches
in cybersecurity, and other causes beyond the reasonable control of the party obligated to perform, regardless of whether such other causes
are  (A)  foreseeable  or  unforeseeable  or  (B)  related  to  the  specifically  enumerated  events  in  this  Section  24.13  (collectively,  the  "Force
Majeure") shall excuse the performance of such party for a period equal to any such prevention, delay or stoppage. If this Lease specifies a
time period for performance of an obligation of either party, that time period shall be extended by the period of any delay in such party's
performance caused by a Force Majeure. Any party claiming Force Majeure shall notify the other party in writing of such Force Majeure event,
and may not claim more than five (5) days of retroactive days of Force Majeure delay. Notwithstanding anything to the contrary in this Lease, no
event of Force Majeure shall (1) excuse Tenant's obligations to pay Rent and other charges as and when due pursuant to this Lease, (2) be
grounds for Tenant to abate any portion of Rent due pursuant to this Lease, or entitle either party to terminate this Lease, except as allowed
pursuant to Articles 11 and 12 above, (3) excuse Tenant's obligations under Articles 5 and 21 above, (4) extend the time period for Tenant to
vacate  the  Premises  following  the  expiration  of  the  Lease  Term,  or  (5)  excuse  Tenant's  obligations  under  Section  10.2  to  maintain  the
required insurance. Tenant hereby waives any and all rights it might otherwise have pursuant to Section 1511 of the California Civil Code,
and hereby agrees that this Section 24.13 is an express provision to the contrary.

24.14

Notices. All notices, demands, statements, approvals or communications (collectively, "Notices") given or required
to be given by either party to the other pursuant to any provision of this Lease shall be in writing, and shall be sent by United States certified
or  registered  mail,  postage  prepaid,  return  receipt  requested,  or  Priority  Mail  Express  (with  waiver  of  signature)  together  with  a  courtesy
electronic copy of the Notice, or by a nationally recognized overnight courier service (e.g., Federal Express), or delivered personally (i) to
Tenant at the appropriate address set forth in Section 5 of the Summary, or to such other place as Tenant may from time to time designate in a
Notice to Landlord; or (ii) to Landlord at the addresses set forth in Section 3 of the Summary, or to such other firm or to such other place as
Landlord may from time to time designate in a Notice to Tenant. Any Notice is deemed given (A) on the date which is two (2) business days
after it is mailed as provided in this Section 24.14, or (B) upon the date which is one (1) business day after it is sent by nationally recognized
overnight courier, or (C) upon the date personal delivery is made to the address of the addressee (even if refused or rejected). If Tenant is
notified of the identity and address of Landlord's mortgagee or ground lessor, Tenant shall give to such mortgagee or ground lessor written
notice of any default by Landlord under the terms of this Lease pursuant to the provisions hereinabove, and such mortgagee or ground lessor
shall be

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given a reasonable opportunity to cure such default prior to Tenant's exercising any remedy available to Tenant.

24.15

Joint and Several. If there is more than one person or entity executing this Lease as Tenant, the obligations imposed

upon such persons and entities under this Lease are and shall be joint and several.

24.16

Authority. Each individual executing this Lease on behalf of Tenant hereby represents and warrants that Tenant is a
duly formed and existing entity qualified to do business in California and that Tenant has full right and authority to execute and deliver this
Lease and that each person signing on behalf of Tenant is authorized to do so.

24.17

24.18

Governing Law. This Lease shall be construed and enforced in accordance with the laws of the State of California.

Submission  of  Lease.  Submission  of  this  instrument  for  examination  or  signature  by  Tenant  does  not  constitute  a

reservation of or an option for lease, and it is not effective as a lease or otherwise until execution and delivery by both Landlord and Tenant.

24.19

Brokers. Landlord and Tenant each hereby represents and warrants to the other party that it (i) has had no dealings
with any real estate broker or agent in connection with the negotiation of this Lease, excepting only the real estate brokers or agents specified
in  Section  12  of  the  Summary  (collectively,  the  "Brokers"),  and  (ii)  knows  of  no  other  real  estate  broker  or  agent  who  is  entitled  to  a
commission in connection with this Lease. Landlord shall pay the brokerage commissions owing to the Brokers in connection with this Lease
pursuant  to  the  terms  of  a  separate  written  agreement  between  and/or  among  Landlord  and  the  Brokers.  Each  party  agrees  to  indemnify,
defend, protect and hold the other party harmless from and against any and all Claims with respect to any leasing commission or equivalent
compensation alleged to be owing on account of the indemnifying party's dealings with any real estate broker or agent in connection with this
Lease other than the Brokers. The terms of this Section 24.19 shall survive the expiration or earlier termination of the Lease Term.

24.20

Independent Covenants. This Lease shall be construed as though the covenants herein between Landlord and Tenant
are independent and not dependent and Tenant hereby expressly waives the benefit of any statute to the contrary and agrees that if Landlord
fails to perform its obligations set forth herein, Tenant shall not be entitled to make any repairs or perform any acts hereunder at Landlord's
expense or to any setoff of the Rent or other amounts owing hereunder against Landlord; provided, however, that the foregoing shall in no
way impair the right of Tenant to commence a separate action against Landlord for any violation by Landlord of the provisions hereof so long
as notice is first given to Landlord and any holder of a mortgage or deed of trust covering the Building, Project or any portion thereof, of
whose address Tenant has theretofore been notified, and an opportunity is granted to Landlord and such holder to correct such violations as
provided above.

24.21

Project Name and Signage.  Landlord  shall  have  the  right  at  any  time  to  designate  and/or  change  the  name  of  the
Project, the Building and/or the Additional Buildings, and to install, affix and maintain any and all signs on the exterior and on the interior of
the  Project,  the  Building  and/or  the  Additional  Buildings,  as  Landlord  may,  in  Landlord's  sole  discretion,  desire.  Tenant  shall  not  use  the
name  of  the  Project,  the  Building  and/or  the  Additional  Buildings,  or  use  pictures  or  illustrations  of  the  Project,  the  Building  and/or  the
Additional Buildings, in advertising or other publicity, without the prior written consent of Landlord.

24.22

Successors. Except as otherwise expressly provided herein, the obligations of this Lease shall bind and benefit the
successors and assigns of the parties hereto; provided, however, that no assignment, sublease or other Transfer in violation of the provisions
of Article 14 shall operate to vest any rights in any putative assignee, subtenant or transferee of Tenant.

24.23

Landlord Renovations. Except as specifically set forth in this Lease: (i) Landlord has no obligation to alter, remodel,
improve, renovate, repair or decorate the Premises, Building, the Additional Buildings, Project or any part thereof; and (ii) no representations
or warranties respecting the condition of the Premises, the Building, the Additional Buildings or the Project have been made by Landlord to
Tenant.  At  Landlord's  option,  Landlord  may  at  any  time  and  from  time  to  time,  renovate,  improve,  alter,  or  modify  (collectively,  the
"Renovations") the Building, the Premises, and/or the Project, including without limitation the Building Parking Facilities, common areas,
systems  and  equipment,  roof,  and  structural  portions  of  the  same,  which  Renovations  may  include,  without  limitation,  (A)  modifying  the
common areas and tenant spaces to comply with applicable laws and regulations, including regulations relating to the physically disabled,
seismic conditions, and building safety and security, (B) installing new floor covering, lighting, and wall coverings in the common areas, and
in  connection  with  any  Renovations,  Landlord  may,  among  other  things,  erect  scaffolding  or  other  necessary  structures  in  the  Building  or
Project, limit or eliminate access to portions of the Project, including portions of the common

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areas, or perform work in the Building or Project, which work may create noise, dust or leave debris in the Project, (C) renovation of the
main  entry  to  the  Building  and  the  main  Building  lobby  area,  (D)  renovation  of  the  elevator,  lobbies,  elevator  doors  and  frames,  and  (E)
installations, repairs or maintenance of telephone risers. Tenant hereby agrees that such Renovations and Landlord's actions in connection
with such Renovations shall in no way constitute a constructive eviction of Tenant nor entitle Tenant to any abatement of Rent. Landlord
shall have no responsibility or for any reason be liable to Tenant for any direct or indirect injury to or interference with Tenant's business
arising from the Renovations, nor shall Tenant be entitled to any compensation or damages from Landlord for loss of the use of the whole or
any part of the Premises or of Tenant's personal property or improvements resulting from the Renovations or Landlord's actions in connection
with  such  Renovations,  or  for  any  inconvenience  or  annoyance  occasioned  by  such  Renovations  or  Landlord's  actions  in  connection  with
such Renovations.

24.24

Confidentiality. Tenant acknowledges that the contents of this Lease (specifically including, but not limited, to the
Base Rent abatement provisions and the amount of the Abated Rent set forth in Section 3.2 above) are confidential information. Tenant shall
keep  such  information  confidential  and  shall  not  disclose  such  confidential  information  to  any  person  or  entity  other  than  Tenant's  legal,
accounting, and space planning consultants, respectively, or as otherwise required by law (collectively, the "Authorized Parties"), and shall
instruct the Authorized Parties to keep such information confidential. If Tenant discloses any such confidential information to anyone other
than  the  Authorized  Parties,  then  Tenant  shall  be  in  default  under  this  Lease  without  the  benefit  of  any  notice  and  cure  period,  and,  in
addition to all of Landlord's other rights and remedies resulting from such default, (i) if such default occurs prior to the end of the Abatement
Period, Tenant shall no longer be entitled to receive the Abated Rent not theretofore accrued, and Landlord shall be entitled to recover all of
the  Abated  Rent  theretofore  provided  to  Tenant,  and  (ii)  if  such  default  occurs  after  the  end  of  the  Abatement  Period,  Landlord  shall  be
entitled to recover all of the Abated Rent theretofore provided to Tenant.

24.25

Landlord's Title; Air Rights. Landlord's title is and always shall be paramount to the title of Tenant. Nothing herein
contained shall empower Tenant to do any act which can, shall or may encumber the title of Landlord. No rights to any view or to light or air
over any property, whether belonging to Landlord or any other person, are granted to Tenant by this Lease.

24.26

No  Waiver.  No  waiver  of  any  provision  of  this  Lease  shall  be  implied  by  any  failure  of  a  party  to  enforce  any
remedy on account of the violation of such provision, even if such violation shall continue or be repeated subsequently, any waiver by a party
of any provision of this Lease may only be in writing, and no express waiver shall affect any provision other than the one specified in such
waiver  and  that  one  only  for  the  time  and  in  the  manner  specifically  stated.  No  receipt  of  monies  by  Landlord  from  Tenant  after  the
termination of this Lease shall in any way alter the length of the Lease Term or of Tenant's right of possession hereunder or after the giving of
any notice shall reinstate, continue or extend the Lease Term or affect any notice given Tenant prior to the receipt of such monies, it being
agreed that after the service of notice or the commencement of a suit or after final judgment for possession of the Premises, Landlord may
receive and collect any Rent due, and the payment of said Rent shall not waive or affect said notice, suit or judgment.

24.27

Jury  Trial.  IF  EITHER  PARTY  COMMENCES  LITIGATION  AGAINST  THE  OTHER  FOR  THE  SPECIFIC
PERFORMANCE OF THIS LEASE, FOR DAMAGES FOR THE BREACH HEREOF OR OTHERWISE FOR ENFORCEMENT OF ANY
REMEDY HEREUNDER, THE PARTIES HERETO AGREE TO AND HEREBY DO WAIVE ANY RIGHT TO A TRIAL BY JURY.

24.28

Attorneys'  Fees.  In  the  event  of  any  such  commencement  of  litigation,  the  prevailing  party  shall  be  entitled  to
recover  from  the  other  party  such  costs  and  reasonable  attorneys'  fees  as  may  have  been  incurred,  including  any  and  all  costs  incurred  in
enforcing, perfecting and executing such judgment. In addition, Tenant shall reimburse Landlord, upon demand, for all reasonable attorneys’
fees  incurred  in  collecting  Rent,  resolving  any  actual  default  by  Tenant,  securing  indemnification  as  provided  in  this  Lease  or  otherwise
seeking enforcement against Tenant, its sublessees and assigns, of Tenant’s obligations under this Lease. Should Landlord be made a party to
any  litigation  instituted  by  Tenant  against  a  party  other  than  Landlord,  or  by  a  third  party  against  Tenant,  Tenant  shall  indemnify,  hold
harmless and defend Landlord from any and all Claims in connection with the litigation.

24.29
Building lobby directory.

Building Directory. At Landlord's cost, Landlord shall include Tenant's name and suite number on one (1) line on the

24.30

Application  of  Payments.  Landlord  shall  have  the  right  to  apply  payments  received  from  Tenant  pursuant  to  this
Lease,  regardless  of  Tenant's  designation  of  such  payments,  to  satisfy  any  obligations  of  Tenant  hereunder,  in  such  order  and  amounts  as
Landlord, in its sole discretion, may elect.

24.31

Substitution of Other Premises. Subject to the following provisions of this Section 24.31,  Landlord  shall  have  the

one-time right to move Tenant to other space in the Building of at least the same

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size  as  the  Premises  (the  "Relocation  Space")  and  located  on  the  ground  floor  of  the  Building,  and  all  terms  hereof  shall  apply  to  the
Relocation Space with equal force. In such event, Landlord shall give Tenant at least ninety (90) days' prior written notice (the "Relocation
Notice")  of  Landlord's  election  to  so  relocate  Tenant.  Following  Landlord's  timely  and  proper  delivery  of  a  Relocation  Notice  to  Tenant,
Landlord shall move Tenant's effects from the Premises to the Relocation Space at Landlord's expense at such time and in such manner as to
inconvenience Tenant as little as reasonably practicable, and only after Landlord has delivered the Relocation Space to Tenant with tenant
improvements  installed  therein  (including,  without  limitation,  new  Identification  Signs,  as  applicable)  at  Landlord's  cost  that  have  been
substantially completed and are substantially similar to or better in quality than those tenant improvements existing in the Premises at the
time Landlord delivered the Relocation Notice to Tenant, provided that such Relocation Space shall have at least the same number of private
offices and conferences rooms existing in the Premises as of the date of Landlord’s delivery of the Relocation Notice. In addition, if Landlord
elects  to  relocate  the  Premises  to  a  qualified  Relocation  Space,  then  Landlord,  within  thirty  (30)  days  after  Landlord's  receipt  of  invoices
from Tenant accompanied by contracts, receipts and other back-up documentation reasonably requested by Landlord, shall reimburse Tenant
for Tenant's actual, verifiable and reasonable out-of-pocket expenses for (i) moving Tenant's furniture, fixtures, equipment, and supplies from
the Premises to the Relocation Space, and (ii) if Tenant's suite number for the Premises shall change, reprinting Tenant's business stationery
in the same quality and quantity as Tenant's stationery supply on hand immediately prior to Tenant's receipt of the Relocation Notice. Such
relocation shall not terminate or otherwise affect or modify this Lease except that from and after the date of such relocation, the "Premises"
shall refer to the Relocation Space into which Tenant has been moved, rather than the original Premises as defined in this Lease. Prior to or
concurrently  with  such  relocation  of  the  Premises,  the  parties  shall  execute  an  amendment  to  this  Lease  confirming  such  relocation.  Such
relocation shall take place in accordance with and subject to the following: (A) the physical relocation of the Premises shall be accomplished
by Landlord at its expense over a weekend; and (B) if the rentable square feet of the Relocation Space is larger than the rentable square feet
of the Premises immediately before the relocation, the Base Rent and Tenant's Share for the Relocation Space shall not increase but shall
continue  to  be  based  on  the  rentable  square  feet  of  the  Premises  immediately  before  the  relocation.  Notwithstanding  the  foregoing  to  the
contrary, if Landlord delivers a Relocation Notice to Tenant during the last twelve (12) months of the Lease Term, then Tenant may, within
fifteen  (15)  days  after  receipt  of  such  Relocation  Notice,  elect  to  terminate  this  Lease  by  delivering  written  notice  of  termination  (the
“Relocation  Termination  Notice”)  to  Landlord  specifying  the  date  upon  which  Tenant  desires  to  terminate  this  Lease  (the  "Relocation
Termination Date"), which Relocation Termination Date must occur no earlier than fifteen (15) days after the date the Relocation Termination
Notice is received by Landlord and no later than ninety (90) days after the date the Relocation Termination Notice is received by Landlord
and prior to the Lease Expiration Date; provided, however, if Tenant delivers a Relocation Termination Notice to Landlord, then Landlord
may  rescind  Landlord’s  Relocation  Notice  by  delivering  written  notice  of  such  rescission  to  Tenant  within  ten  (10)  days  after  Landlord’s
receipt of the Relocation Termination Notice, in which case, Landlord’s Relocation Notice shall be deemed null and void and this Lease shall
continue in full force and effect.

24.32

Electronic Services.

24.32.1

Tenant’s Lines. Tenant may, in a manner consistent with the provisions and requirements of this Lease,
install,  maintain,  replace,  remove  or  use  any  communications  or  computer  or  other  electronic  service  wires,  cables  and  related  devices
(collectively the "Lines") at the Building in or serving the Premises, provided: (i) Tenant shall obtain Landlord’s prior written consent, which
consent  may  be  conditioned  as  required  by  Landlord;  (ii)  Tenant  shall  cooperate  with  Landlord's  riser  management  vendor(s)  and
consultant(s), as required by Landlord; (iii) if Tenant at any time uses any equipment that may create an electromagnetic field exceeding the
normal insulation ratings of ordinary twisted pair riser cable or cause radiation higher than normal background radiation, the Lines therefor
(including riser cables) shall be appropriately insulated to prevent such excessive electromagnetic fields or radiation; and (iv) Tenant shall
pay all costs in connection therewith. Landlord reserves the right to require that Tenant remove any Lines which are installed in violation of
these provisions. Tenant shall not, without the prior written consent of Landlord in each instance, grant to any third party a security interest or
lien in or on the Lines, and any such security interest or lien granted without Landlord’s written consent shall be null and void.

24.32.2

Definition  of  Electronic  Services.  As  used  herein,  "Electronic  Services  Provider"  means  a  business
which  provides  telephone,  telegraph,  telex,  video,  other  telecommunications  or  other  services  which  permit  Tenant  to  receive  or  transmit
information by the use of electronics and which require the use of wires, cables, antennas or similar devices in or on the Building and/or
Project. The services of Electronic Services Providers are sometimes referred to herein as "Electronic Services".

24.32.3

No Right to Specific Services. Landlord shall have no obligation to (i) install any Electronic Services
equipment  or  facilities,  (ii)  make  available  to  Tenant  the  services  of  any  particular  Electronic  Services  Provider,  (iii)  allow  any  particular
Electronic Services Provider access to the Building and/or Project, and/or (iv) continue to grant access to an Electronic Services Provider
once such provider

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has  been  given  access  to  the  Building  and/or  Project.  Landlord  may  (but  shall  not  have  the  obligation  to):  (A)  install  new  Lines  at  the
property; (B) create additional space for Lines at the property; and (C) adopt reasonable and uniform rules and regulations with respect to
Lines.

24.32.4

Limitation of Landlord’s Responsibility.  Tenant  acknowledges  and  agrees  that  all  Electronic  Services
desired by Tenant shall be ordered and utilized at the sole expense of Tenant. Unless Landlord otherwise requests or consents in writing, all
of Tenant's Electronic Services equipment shall be and remain solely in the Premises and the telephone closet(s) on the floor(s) on which the
Premises is located, in accordance with rules and regulations adopted by Landlord from time to time. Unless otherwise specifically agreed to
in writing, Landlord shall have no responsibility for the maintenance of Tenant's Electronic Services equipment, including Lines; nor for any
Lines  or  other  infrastructure  to  which  Tenant's  Electronic  Services  equipment  may  be  connected.  Tenant  agrees  that,  to  the  extent  any
Electronic Services are interrupted, curtailed or discontinued, Landlord shall have no obligation or liability with respect thereto and it shall be
the  sole  obligation  of  Tenant  at  its  own  expense  to  obtain  substitute  service.  Except  to  the  extent  arising  from  the  negligence  or  willful
misconduct of Landlord or Landlord’s agents or employees and not insured or required to be insured by Tenant under this Lease, Landlord
shall have no liability for damages arising from, and Landlord does not warrant that Tenant’s use of any Lines will be free from the following
(collectively called "Line Problems"): (i) any eavesdropping or wire-tapping by unauthorized parties; (ii) any failure of any Lines to satisfy
Tenant’s  requirements;  or  (iii)  any  shortages,  failures,  variations,  interruptions,  disconnections,  loss  or  damage  caused  by  the  installation,
maintenance, replacement, use or removal of Lines by or for other tenants or occupants at the property. Under no circumstances shall any
Line Problems be deemed an actual or constructive eviction of Tenant, render Landlord liable to Tenant for abatement of Rent, or relieve
Tenant  from  performance  of  Tenant’s  obligations  under  this  Lease.  Landlord  in  no  event  shall  be  liable  for  damages  by  reason  of  loss  of
profits, business interruption or other consequential damage arising from any Line Problems.

24.32.5

Necessary Service Interruptions. Landlord shall have the right, upon reasonable prior notice to Tenant,
to interrupt or turn off Electronic Services facilities in the event of emergency or as necessary in connection with maintenance, repairs or
construction at the Building and/or Project or installation of Electronic Services equipment for other tenants of the Building and/or Project or
on account of violation by the Electronic Services Provider or owner of the Electronic Services equipment of any obligation to Landlord or in
the event that Tenant’s use of the Electronic Services infrastructure of the Building and/or Project materially interferes with the Electronic
Services of other tenants of the Building and/or Project.

24.32.6

Removal  of  Equipment,  Wiring  and  Other  Facilities.  Any  and  all  Electronic  Services  equipment
installed  in  the  Premises  or  elsewhere  in  the  Building  and/or  Project  by  or  on  behalf  of  Tenant,  including  Lines,  or  other  facilities  for
Electronic Services reception or transmittal, shall be removed prior to the expiration or earlier termination of the Lease term, by Tenant at its
sole cost or, at Landlord's election, by Landlord at Tenant's sole cost, with the cost thereof to be paid as additional rent. Landlord shall have
the right, however, upon written notice to Tenant given no later than thirty (30) days prior to the expiration or earlier termination of the Lease
Term (except that the notice period shall extend to thirty (30) days beyond the date of termination of the Lease if it is terminated by either
party due to a default by the other), to require Tenant to abandon and leave in place, without additional payment to Tenant or credit against
Rent,  any  and  all  Electronic  Services  Lines  and  related  infrastructure,  or  selected  components  thereof,  whether  located  in  the  Premises  or
elsewhere in the Building and/or Project.

24.32.7

New Provider Installations. If Tenant wishes at any time to utilize the services of an Electronic Services
Provider whose equipment is not then servicing the Building and/or Project, no such Electronic Services Provider shall be permitted to install
its  Lines  or  other  equipment  within  the  Building  and/or  Project  without  first  securing  the  prior  written  approval  of  Landlord.  Landlord's
approval  shall  not  be  deemed  any  kind  of  warranty  or  representation  by  Landlord,  including,  without  limitation,  any  warranty  or
representation as to the suitability, competence, or financial strength of the Electronic Services Provider. Without limitation of the foregoing
standard, unless all of the following conditions are satisfied to Landlord's satisfaction, it shall be reasonable for Landlord to refuse to give its
approval:  (i)  Landlord  shall  incur  no  current  expense  or  risk  or  future  expense  whatsoever  with  respect  to  any  aspect  of  the  Electronic
Services Provider's provision of its Electronic Services, including without limitation, the costs of installation, materials and services; (ii) prior
to commencement of any work in or about the Building and/or Project by the Electronic Services Provider, the Electronic Services Provider
shall supply Landlord with such written indemnities, insurance, financial statements, and such other items as Landlord reasonably determines
to  be  necessary  to  protect  its  financial  interests  and  the  interests  of  the  Building  and  Project  relating  to  the  proposed  activities  of  the
Electronic Services Provider; (iii) the Electronic Services Provider agrees to abide by such rules and regulations, Building and other codes,
job site rules and such other requirements as are reasonably determined by Landlord to be necessary to protect the interests of the Building
and/or Project, the tenants in the Building and Landlord, in the same or similar manner as Landlord has the right to protect itself and the
Building  and/or  Project  with  respect  to  proposed  alterations  as  described  in  Section  8  above;  (iv)  Landlord  reasonably  determines  that,
considering other

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potential uses for space in the Building and/or Project, there is sufficient space in the Building and/or Project for the placement of all of the
provider's equipment, conduit, Lines and other materials; (v) the Electronic Services Provider agrees to abide by Landlord’s requirements, if
any,  that  providers  use  existing  Building  conduits  and  pipes  or  use  Building  contractors  (or  other  contractors  approved  by  Landlord);  (vi)
Landlord receives from the Electronic Services Provider such compensation as is reasonably determined by Landlord to compensate it for
space used in the Building and/or Project for the storage and maintenance of the Electronic Services Provider's equipment, for the fair market
value of an Electronic Services Provider's access to the Building and Project, for the use of common or core space within the Building and/or
Project and the costs which may reasonably be expected to be incurred by Landlord; (vii) the provider agrees to deliver to Landlord plans
prior to the installation of the provider's equipment and detailed "as built" plans immediately after the installation of the provider's equipment
is complete; and (viii) all of the foregoing matters are documented in a written license agreement between Landlord and the provider, the
form and content of which is reasonably satisfactory to Landlord.

24.32.8

Limit of Default or Breach. Notwithstanding anything in this Section 24.32 to the contrary, the refusal
of Landlord to grant its approval to any prospective Electronic Services Provider shall not be deemed a default or breach by Landlord of its
obligation under this Lease unless and until Landlord is adjudicated to have acted recklessly or maliciously with respect to Tenant's request
for approval, and in that event, Tenant shall still have no right to terminate this Lease or claim an entitlement to Rent abatement, but may as
Tenant's  sole  and  exclusive  recourse  seek  a  judicial  order  of  specific  performance  compelling  Landlord  to  grant  its  approval  as  to  the
prospective  provider  in  question.  The  provisions  of  this  Section 24.32.8  may  be  enforced  solely  by  Tenant  and  Landlord,  are  not  for  the
benefit of any other party, and specifically but without limitation, no telephone or other Electronic Services Provider shall be deemed a third
party beneficiary of this Lease.

24.32.9

Installation and Use of Wireless Technologies. Tenant shall not utilize any wireless Electronic Services
equipment  (other  than  usual  and  customary  cellular  telephones),  including  antennae  and  satellite  receiver  dishes,  within  the  Tenant's
premises, within the Building and/or Project or attached to the outside walls or roof of the Building, without Landlord's prior written consent.
Such consent may be conditioned in such a manner so as to protect Landlord's financial interests and the interests of the Building and Project,
and the other tenants therein, in a manner similar to the arrangements described in the immediately preceding paragraphs.

24.32.10

Limitation  of  Liability  For  Equipment  Interference.  If  Electronic  Services  equipment,  Lines  and
facilities  or  satellite  and  antennae  equipment  of  any  type  installed  by  or  at  the  request  of  Tenant  within  the  Premises,  on  the  roof,  or
elsewhere  within  or  on  the  Building  and/or  Project  causes  interference  to  equipment  used  by  another  party,  Tenant  shall  cease  using  such
equipment, Lines and facilities or satellite and antennae equipment until the source of the interference is identified and eliminated and Tenant
shall assume all liability related to such interference. Tenant shall cooperate with Landlord and other parties, to eliminate such interference
promptly. If Tenant is unable to do so, Tenant will substitute alternative equipment which remedies the situation. If such interference persists,
Tenant shall, at Landlord's sole discretion, remove such equipment.

24.33

Waiver of Claims. As a material inducement to Landlord to enter into this Lease, Tenant hereby releases Landlord
from, and hereby waives, any and all losses, costs, damages, expenses, liabilities, claims and causes of action (including, without limitation,
attorneys' fees) (collectively, the "Released Claims") arising from or related to Tenant's inability or limitation to conduct operations from the
Premises as a result of any "shelter in place" and/or “safer at home” orders, eviction moratoria or similar governmental directives, including,
without  limitation,  any  claims  for,  and/or  rights  of,  termination  of  this  Lease  and/or  abatement,  offset  and/or  deferral  of  Rent  under  this
Lease, at law and/or in equity (including without limitation, any claims for frustration of purpose, impossibility and impracticability) related
to the inability of Tenant to conduct operations from the Premises whether from any "shelter in place" and/or “safer at home” orders, eviction
moratoria or similar governmental directives related thereto or otherwise and/or any economic or other effects on Tenant's business and/or
financial wherewithal as a result therefrom. With respect to the Released Claims, Tenant acknowledges that Tenant has either been advised by
legal counsel or has made itself familiar with the provisions of California Civil Code section 1542, which provides as follows: A GENERAL
RELEASE DOES NOT EXTEND TO CLAIMS THAT THE CREDITOR OR RELEASING PARTY DOES NOT KNOW OR SUSPECT TO
EXIST IN HIS OR HER FAVOR AT THE TIME OF EXECUTING THE RELEASE AND THAT, IF KNOWN BY HIM OR HER, WOULD
HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR OR RELEASED PARTY. Tenant, being aware of
the foregoing code section, hereby expressly waives any rights Tenant may have thereunder, as well as under any other statutes or common-
law principles of similar effect, pertaining to the Released Claims.

24.34

Counterparts.  This  Lease  may  be  executed  in  any  number  of  counterparts,  each  of  which  shall  be  deemed  an

original, but all of which when taken together will constitute one and the same instrument.

-36-

 
24.35

Electronic Signatures.  Each  of  the  parties  to  this  Lease  (i)  has  agreed  to  permit  the  use  from  time  to  time,  where
appropriate,  of  telecopy  or  other  electronic  signatures  (including,  without  limitation,  DocuSign)  in  order  to  expedite  the  transaction
contemplated by this Lease, (ii) intends to be bound by its respective telecopy or other electronic signature, (iii) is aware that the other will
rely  on  the  telecopied  or  other  electronically  transmitted  signature,  and  (iv)  acknowledges  such  reliance  and  waives  any  defenses  to  the
enforcement of this Lease and the documents affecting the transaction contemplated by this Lease based on the fact that a signature was sent
by telecopy or electronic transmission only.

24.36

Conference Center; Gym.

24.36.1

Conference Center; Gym. Subject to the following terms of this Section 24.36, Tenant and its individual
employees  shall  have  the  non-exclusive  right,  throughout  the  Lease  Term,  but  from  5:00  a.m.  to  8:00  p.m.,  Monday  through  Friday
(excluding  holidays)  (the  "Conference  Center/Gym  Hours"),  only,  to  use  the  Building's  (i)  existing  conference  center  (the  "Conference
Center")  located  in  the  Building  for  the  limited  purpose  of  conducting  business  meetings,  presentations,  trainings  and/or  other  functions
directly  related  to  Tenant's  permitted  use  under  Section  5.1  above,  and  (ii)  existing  gym  (the  “Gym”)  located  in  the  Building  for  fitness
related  activities;  provided,  however,  that  (A)  Tenant's  employees  shall  be  required  to  sign  Landlord's  form  of  "Release  and
Acknowledgment" prior to using the Gym, and (B) the use of the Conference Center and the Gym and the Conference Center/Gym Hours are
subject  to  permanent  closure,  change,  restriction  and  other  limitations  as  determined  by  Landlord,  in  Landlord’s  sole  discretion,  for  any
reason  (including,  without  limitation,  for  issues  relating  to  the  COVID-  19  pandemic,  and/or  other  "shelter  in  place,"  "stay  at  home"  and
similar governmental directives and/or any other Force Majeure events) or no reason at all.

24.36.2

Reservation  of  Conference  Center.  Tenant  shall  reserve  the  Conference  Center  by  delivering  to
Landlord no less than seven (7) days' prior written notice, provided that: (i) all reservations shall be on a "first come, first served" basis; and
(ii) Landlord may, at Landlord's sole discretion, modify such reservation procedures at any time prior to or during the Lease Term. Tenant
will  be  charged  an  hourly  administrative  fee  at  the  Building's  then-prevailing  rate  (each,  a  "Reservation  Fee")  for  use  of  the  Conference
Center, which current prevailing rate is currently $15.00 per hour, plus any applicable cleaning fee. Tenant shall pay the Reservation Fee to
Landlord within thirty (30) days after Tenant's receipt of an invoice therefor. Tenant shall be permitted to use the Gym on a “first come, first
served basis” without the payment of any additional fee.

24.36.3

Use of Conference Center and Gym. Tenant shall not do or permit anything to be done in or about the
Conference  Center  or  Gym  that  would  in  any  way  unreasonably  obstruct  or  interfere  with  the  rights  of  other  tenants  or  occupants  of  the
Building; nor shall Tenant use or allow the Conference Center or Gym to be used for any unlawful or objectionable purpose; nor shall Tenant
cause, maintain or permit any nuisance or offensive sound, smell or light in, on or about the Conference Center or Gym. Additionally, Tenant
shall not use or permit the Conference Center or Gym to be used for any parties, social functions, or fundraisers or permit any live music,
comedy  acts,  dancing,  stage  shows,  or  any  other  form  of  "live  entertainment"  without  Landlord's  prior  written  consent,  which  may  be
withheld by Landlord in its sole and absolute discretion.

Building arising out of or in any way pertaining to Tenant's use of the Conference Center or Gym, as applicable.

24.36.4

Maintenance. Tenant will be responsible for any damage done to the Conference Center, Gym and the

24.36.5

Indemnification. Tenant shall indemnify, defend and hold Landlord and the Landlord Parties harmless
from and against any and all Claims to the extent arising out of or in any way pertaining to Tenant's use of the Conference Center and Gym,
including, without limitation, as a result of any failure of Tenant to maintain the Conference Center and Gym in a safe condition during its
occupancy  thereof  or  otherwise.  None  of  Landlord  or  the  Landlord  Parties  shall  be  responsible  for  any  loss  or  theft  whatsoever  of  any
property or anything placed by Tenant in the Conference Center or Gym. Tenant, as a material part of the consideration of this Lease, waives
all  claims  or  demands  against  Landlord  and  the  Landlord  Parties  for  any  such  loss,  damage  or  injury  of  Tenant  or  Tenant's  property,  and
agrees to so indemnify and hold Landlord and the Landlord Parties harmless therefrom.

24.36.6

Rights Personal. Tenant's rights under this Section 24.36  are  personal  to  the  Original  Tenant  and  may
only be utilized by the Original Tenant (and may not be exercised or utilized by any other person or entity, including any sublessee or other
transferee of the Original Tenant's interest in the Lease or the Premises) when the Original Tenant is in actual and physical possession of the
entire Premises.

and/or Gym to different locations in the Project.

24.36.7

Relocation.  Landlord,  in  its  reasonable  discretion,  may,  at  any  time,  relocate  the  Conference  Center

[SIGNATURES APPEAR ON FOLLOWING PAGE]

-37-

 
IN WITNESS WHEREOF, Landlord and Tenant have caused their duly authorized representatives to execute this Lease as of the

day and date first above written.

"Landlord"

KW FUND VI-SAN MATEO, LLC,
a Delaware limited liability company

By:

  /s/ Kent Mouton
  Name:
  Its:

  Kent Mouton
  President

"Tenant"

SIERRA ONCOLOGY, INC.,
a Delaware corporation

By:

  /s/ Stephen Dilly
  Name:
  Its:

  Stephen Dilly
  President & CEO

Since  Tenant  is  a  corporation,  the  authorized  officers  must  sign  on  behalf  of  the  corporation  and  indicate  the  capacity  in  which  they  are
signing.  This  Lease  must  be  executed  by  the  president  or  vice  president  and  the  secretary  or  assistant  secretary,  unless  the  bylaws  or  a
resolution of the board of directors shall otherwise provide, in which event the bylaws or a certified copy of the resolution, as the case may
be, must be attached to this Lease. In addition, a certificate by the secretary of the corporation must be attached to this Lease stating that the
signatories are authorized to sign on behalf of the corporation.

-38-

 
 
 
 
 
 
 
 
 
EXHIBIT A

FLOOR PLAN OF PREMISES

This Exhibit A is provided for informational purposes only and is intended to be only an approximation of the layout of the Premises and
shall not be deemed to constitute any representation by Landlord as to the exact layout or configuration of the Premises.

EXHIBIT A

-1-

 
 
 
 
 
EXHIBIT B

RULES AND REGULATIONS

Tenant shall faithfully observe and comply with the following Rules and Regulations. Landlord shall not be responsible to Tenant
for the nonperformance of any of said Rules and Regulations by or otherwise with respect to the acts or omissions of any other tenants or
occupants of the Project.

1.

Tenant shall not alter any lock or install any new or additional locks or bolts on any doors or windows of the Premises
without obtaining Landlord's prior written consent. Tenant shall bear the cost of any lock changes or repairs required by Tenant. Two (2) keys
will be furnished by Landlord for the Premises, and any additional keys required by Tenant must be obtained from Landlord at a reasonable
cost to be established by Landlord. Upon the expiration or earlier termination of the Lease, Tenant shall restore to Landlord all keys of stores,
offices, and toilet rooms, either furnished to, or otherwise procured by, Tenant, and in the event of the loss of any keys so furnished, Tenant
shall  pay  to  Landlord  the  cost  of  replacing  the  same  or  of  changing  the  lock  or  locks  opened  by  such  lost  key  if  Landlord  shall  deem  it
necessary to make such change.

2.

All  doors  opening  to  public  corridors  shall  be  kept  closed  at  all  times  except  for  normal  ingress  and  egress  to  the

Premises, unless electrical hold backs have been installed.

3.

Landlord reserves the right to close and keep locked all entrance and exit doors of the Building and to exclude from the
Building  between  the  hours  of  6:00  p.m.  and  7:00  a.m.  and  at  all  hours  on  Saturday,  Sunday  and  Holidays  (as  defined  in  the  Lease)  all
persons who do not present a pass or card key to the Building approved by Landlord. Tenant, its employees and agents must be sure that the
doors to the Building are securely closed and locked when leaving the Premises if it is after the normal hours of business for the Building.
Any tenant, its employees, agents or any other persons entering or leaving the Building at any time when it is so locked, or any time when it
is considered to be after normal business hours for the Building may be required to sign the Building register when so doing. After-hours
access by Tenant's authorized employees may be provided by card-key access or other procedures adopted by Landlord from time to time;
Tenant shall pay for the costs of all access cards provided to Tenant's employees and all replacements thereof for lost, stolen or damaged
cards. Access to the Building may be refused unless the person seeking access has proper identification or has a previously arranged pass for
access. Tenant and its employees shall not go upon the roof of the Building and/or the Additional Buildings without the written consent of
Landlord. Landlord and its agents shall in no case be liable for damages for any error with regard to the admission to or exclusion from the
Building  or  Project  of  any  person.  In  case  of  invasion,  mob,  riot,  public  excitement,  or  other  commotion,  Landlord  reserves  the  right  to
prevent access to the Building and/or Project during the continuance of same by any means it deems appropriate for the safety and protection
of life and property.

4.

Landlord shall have the right to prescribe the weight, size and position of all safes and other heavy property brought into
the Building. Safes and other heavy objects shall, if considered necessary by Landlord, stand on supports of such thickness as is necessary to
properly distribute the weight. Landlord will not be responsible for loss of or damage to any such safe or property in any case. All damage
done to any part of the Building and/or Project, its contents, occupants or visitors by moving or maintaining any such safe or other property
shall be the sole responsibility of Tenant and any expense of said damage or injury shall be borne by Tenant.

5.

No furniture, freight, packages, supplies, equipment or merchandise will be brought into or removed from the Building
or carried up or down in the elevators, except upon prior notice to Landlord, and in such manner, in such specific elevator, and between such
hours as shall be designated by Landlord. Tenant shall provide Landlord with not less than twenty-four (24) hours' prior notice of the need to
utilize an elevator for any such purpose, so as to provide Landlord with a reasonable period to schedule such use and to install such padding
or  take  such  other  actions  or  prescribe  such  procedures  as  are  appropriate  to  protect  against  damage  to  the  elevators  or  other  parts  of  the
Building.

6.

Landlord shall have the right to control and operate the public portions of the Building and Project, the public facilities,

the HVAC, and any other facilities furnished for the common use of tenants, in such manner as is customary for Comparable Buildings.

7.

The  requirements  of  Tenant  will  be  attended  to  only  upon  application  at  the  management  office  of  the  Building  or  at
such office location designated by Landlord. Employees of Landlord shall not perform any work or do anything outside their regular duties
unless under special instructions from Landlord.

8.
agents to prevent same.

Tenant shall not disturb, solicit, or canvass any occupant of the Project and shall cooperate with Landlord or Landlord's

EXHIBIT B

-1-

 
 
 
9.

The toilet rooms, urinals, wash bowls and other apparatus shall not be used for any purpose other than that for which
they were constructed, and no foreign substance of any kind whatsoever shall be thrown therein. The expense of any breakage, stoppage or
damage resulting from the violation of this rule shall be borne by the tenant who, or whose employees or agents, shall have caused it.

10.

Tenant  shall  not  overload  the  floor  of  the  Premises,  nor  mark,  drive  nails  or  screws,  or  drill  into  the  partitions,
woodwork  or  plaster  or  in  any  way  deface  the  Premises  or  any  part  thereof  without  Landlord's  consent  first  had  and  obtained;  provided,
however, Landlord's prior consent shall not be required with respect to Tenant's placement of pictures and other normal office wall hangings
on  the  interior  walls  of  the  Premises  (but  at  the  end  of  the  Lease  Term,  Tenant  shall  repair  any  holes  and  other  damage  to  the  Premises
resulting therefrom).

11.

Except  for  vending  machines  intended  for  the  sole  use  of  Tenant's  employees  and  invitees,  no  vending  machine  or
machines of any description other than fractional horsepower office machines shall be installed, maintained or operated upon the Premises
without the written consent of Landlord.

12.

Tenant  shall  not  use  any  method  of  HVAC  other  than  that  which  may  be  supplied  by  Landlord,  without  the  prior

written consent of Landlord.

13.

Tenant  shall  not  use  or  keep  in  or  on  the  Premises  or  the  Project  any  kerosene,  gasoline  or  other  inflammable  or
combustible  fluid  or  material.  Tenant  shall  not  use,  keep  or  permit  to  be  used  or  kept,  any  foul  or  noxious  gas  or  substance  in  or  on  the
Premises, or permit or allow the Premises to be occupied or used in a manner offensive or objectionable to Landlord or other occupants of the
Project by reason of noise, odors, or vibrations, or interfere in any way with other tenants or those having business therein.

14.

Tenant shall not bring into or keep within the Project or the Premises any animals, birds, bicycles or other vehicles.

15.

No cooking shall be done or permitted by any tenant on the Premises, nor shall the Premises be used for the storage of
merchandise, for lodging or for any improper, objectionable or immoral purposes. Notwithstanding the foregoing, Underwriters' laboratory-
approved equipment and microwave ovens may be used in the Premises for heating food and brewing coffee, tea, hot chocolate and similar
beverages, provided that such use is in accordance with all applicable federal, state and city laws, codes, ordinances, rules and regulations,
and does not cause odors which are objectionable to Landlord and other tenants.

16.

Landlord will approve where and how telephone and telegraph wires are to be introduced to the Premises. No boring,
cutting  or  stringing  of  wires  or  laying  of  linoleum  or  other  similar  floor  coverings  shall  be  allowed  without  the  consent  of  Landlord.  The
location of telephone, call boxes and other office equipment affixed to the Premises shall be subject to the approval of Landlord.

17.

Landlord reserves the right to exclude or expel from the Building and/or Project any person who, in the judgment of
Landlord, is intoxicated or under the influence of liquor or drugs, or who shall in any manner do any act in violation of any of these Rules
and Regulations.

18.

Tenant, its employees and agents shall not loiter in the entrances or corridors, nor in any way obstruct the sidewalks,

lobby, halls, stairways or elevators, and shall use the same only as a means of ingress and egress for the Premises.

19.

Tenant shall not waste electricity, water or air conditioning and agrees to cooperate fully with Landlord to ensure the
most effective operation of the Building's HVAC system, and shall refrain from attempting to adjust any controls. Tenant shall comply with
and participate in any program for metering or otherwise measuring the use of utilities and services, including, without limitation, programs
requiring the disclosure or reporting of the use of any utilities or services. Tenant shall also cooperate and comply with, participate in, and
assist  in  the  implementation  of  (and  take  no  action  that  is  inconsistent  with,  or  which  would  result  in  Landlord,  the  Building  and/or  the
Project  failing  to  comply  with  the  requirements  of)  any  conservation,  sustainability,  recycling,  energy  efficiency,  and  waste  reduction
programs,  environmental  protection  efforts  and/or  other  programs  that  are  in  place  and/or  implemented  from  time  to  time  at  the  Building
and/or the Project, including, without limitation, any required reporting, disclosure, rating or compliance system or program (including, but
not  limited  to,  any  LEED  [Leadership  in  Energy  and  Environmental  Design]  rating  or  compliance  system,  including  those  currently
coordinated through the U.S. Green Building Council).

20.

Tenant  shall  not  use  any  method  of  heating  or  air  conditioning  other  than  that  which  may  be  supplied  by  Landlord,

without the prior written consent of Landlord. Tenant shall not furnish cooling

EXHIBIT B

-2-

 
 
or  heating  to  the  Premises,  including,  without  limitation,  the  use  of  electronic  or  gas  heating  devices,  portable  coolers  (such  as  "move  n
cools") or space heaters, without Landlord's prior written consent, and any such approval will be for devices that meet federal, state and local
code.

21.

Tenant shall store all its trash and garbage within the interior of the Premises. No material shall be placed in the trash
boxes or receptacles if such material is of such nature that it may not be disposed of in the ordinary and customary manner of removing and
disposing of trash and garbage in the city in which the Project is located without violation of any law or ordinance governing such disposal.
All  trash,  garbage  and  refuse  disposal  shall  be  made  only  through  entry-ways  and  elevators  provided  for  such  purposes  at  such  times  as
Landlord shall designate.

22.

Tenant shall comply with all safety, fire protection and evacuation procedures and regulations established by Landlord

or any governmental agency.

23.

Tenant  shall  assume  any  and  all  responsibility  for  protecting  the  Premises  from  theft,  robbery  and  pilferage,  which

includes keeping doors locked and other means of entry to the Premises closed, when the Premises are not occupied.

24.

No awnings or other projection shall be attached to the outside walls of the Building and/or the Additional Buildings
without the prior written consent of Landlord. No curtains, blinds, shades or screens shall be attached to or hung in, or used in connection
with, any window or door of the Premises without the prior written consent of Landlord. The sashes, sash doors, skylights, windows, and
doors that reflect or admit light and air into the halls, passageways or other public places in the Building shall not be covered or obstructed by
Tenant, nor shall any bottles, parcels or other articles be placed on the windowsills. All electrical ceiling fixtures hung in offices or spaces
along the perimeter of the Building must be fluorescent and/or of a quality, type, design and bulb color approved by Landlord.

25.

The  washing  and/or  detailing  of  or,  the  installation  of  windshields,  radios,  telephones  in  or  general  work  on,

automobiles shall not be allowed on the Project.

26.

The term "personal goods or services vendors" as used herein means persons who periodically enter the Building of
which the Premises are a part for the purpose of selling goods or services to a tenant, other than goods or services which are used by the
Tenant only for the purpose of conducting its business in the Premises. "Personal goods or services" include, but are not limited to, drinking
water  and  other  beverages,  food,  barbering  services  and  shoeshining  services.  Landlord  reserves  the  right  to  prohibit  personal  goods  and
services vendors from access to the Building except upon Landlord's prior written consent and upon such reasonable terms and conditions,
including,  but  not  limited  to,  the  payment  of  a  reasonable  fee  and  provision  for  insurance  coverage,  as  are  related  to  the  safety,  care  and
cleanliness  of  the  Building,  the  preservation  of  good  order  thereon,  and  the  relief  of  any  financial  or  other  burden  on  Landlord  or  other
tenants occasioned by the presence of such vendors or the sale by them of personal goods or services to Tenant or its employees. Under no
circumstance shall the personal goods or services vendors display their products in a public or common area, including corridors and elevator
lobbies. If necessary for the accomplishment of these purposes, Landlord may exclude a particular vendor entirely or limit the number of
vendors who may be present at any one time in the Building. No such personal goods or services vendors shall be allowed to transport or
carry beverages, food, food containers, etc., on any passenger elevators. The transportation of such items shall be via the service elevators in
such manner as prescribed by Landlord.

27.

Tenant must comply with requests by the Landlord concerning the informing of their employees of items of importance

to the Landlord.

28.

Tenant  shall  comply  with  any  non-smoking  ordinance  adopted  by  any  applicable  governmental  authority.  Neither
Tenant nor its agents, employees, contractors, guests or invitees shall smoke or permit smoking in the Premises and/or the common areas,
unless  the  common  areas  have  been  declared  a  designated  smoking  area  by  Landlord,  nor  shall  the  above  parties  allow  smoke  from  the
Premises to emanate into the common areas or any other part of the Project. Landlord shall have the right to designate the Building (including
the Premises) as a non-smoking building.

29.

The  Premises  shall  not  be  used  for  manufacturing.  Tenant  shall  not  engage  or  pay  any  employees  on  the  Premises

except those actually working for Tenant on the Premises nor advertise for laborers giving an address at the Premises.

30.

Tenant shall not maintain armed security in or about the Premises nor possess any weapons, explosives, combustibles

or other hazardous devices in or about the Premises, Building and/or Project.

EXHIBIT B

-3-

 
 
31.

Landlord shall have the right to prohibit any advertising by Tenant which, in Landlord’s opinion, tends to impair the
reputation of the Building and/or Project or its desirability as an office building project and upon written notice from Landlord, Tenant shall
refrain from or discontinue such advertising.

32.

Any outside contractor employed by Tenant, shall, while in the Building and/or Project, be subject to the prior written
approval of Landlord and subject to the Rules and Regulations. Tenant shall be responsible for all acts of such persons and Landlord shall not
be responsible for any loss or damage to property in the Premises, Building and/or Project, however occurring.

PARKING RULES AND REGULATIONS

1.

Landlord  reserves  the  right  to  establish  and  reasonably  change  the  hours  for  the  Parking  Facilities,  on  a  non-
discriminatory  basis,  from  time  to  time.  Tenant  shall  not  store  or  permit  its  employees  to  store  any  automobiles  in  the  Parking  Facilities
without the prior written consent of Landlord (and/or the Parking Operator, as the case may be). Except for emergency repairs, Tenant and its
employees shall not perform any work on any automobiles while located in the Parking Facilities or on the Project. The Parking Facilities
may not be used by Tenant or its agents for overnight parking of vehicles. If it is necessary for Tenant or its employees to leave an automobile
in  the  Parking  Facilities  overnight,  Tenant  shall  provide  Landlord  (or  the  Parking  Operator  as  the  case  may  be)  with  prior  notice  thereof
designating the license plate number and model of such automobile.

2.

Tenant  (including  Tenant's  employees  and  agents)  will  use  the  parking  spaces  solely  for  the  purpose  of  parking
passenger model cars, small vans and small trucks and will comply in all respects with any rules and regulations that may be promulgated by
Landlord and/or the Parking Operator from time to time with respect to the Parking Facilities.

3.
reserved for small cars.

Vehicles must be parked entirely within the stall lines painted on the floor, and only small cars may be parked in areas

4.

5.

6.

7.

(a)

(b)

(c)

(d)

(e)

All directional signs and arrows must be observed.

The speed limit shall be 5 miles per hour.

Parking spaces reserved for handicapped persons must be used only by vehicles properly designated.

Parking is prohibited in all areas not expressly designated for parking, including without limitation:

areas not striped for parking;

aisles;

where "no parking" signs are posted;

ramps; and

loading zones.

8.

Parking stickers, key cards and any other devices or forms of identification or entry supplied by Landlord or the Parking
Operator shall remain the property of Landlord (or the Parking Operator as the case may be). Such device must be displayed as requested and
may  not  be  mutilated  in  any  manner.  The  serial  number  of  the  parking  identification  device  may  not  be  obliterated.  Parking  spaces  and
devices are not transferable and any pass or device in the possession of an unauthorized holder will be void.

9.
Regulations.

Parking  managers  or  attendants  are  not  authorized  to  make  or  allow  any  exceptions  to  these  Parking  Rules  and

10.

Every parker is required to park and lock his/her own car.

11.

Loss  or  theft  of  identification,  key  cards  or  other  such  devices  must  be  reported  to  Landlord  (and/or  to  the  Parking
Operator as the case may be) immediately. Any parking devices reported lost or stolen found on any authorized car will be confiscated and
the illegal holder will be subject to prosecution. Lost or stolen devices found by Tenant or its employees must be reported to Landlord (and to
the Parking Operator, as the case may be) immediately.

EXHIBIT B

-4-

 
 
 
 
 
 
 
 
12.

13.

Regulations.

Washing, waxing, cleaning or servicing of any vehicle by the customer and/or its agents is prohibited.

Tenant  agrees  to  acquaint  all  persons  to  whom  Tenant  assigns  a  parking  space  with  these  Parking  Rules  and

14.

Neither Landlord nor the Parking Operator (as the case may be), from time to time will be liable for loss of or damage
to  any  vehicle  or  any  contents  of  such  vehicle  or  accessories  to  any  such  vehicle,  or  any  property  left  in  any  of  the  Parking  Facilities,
resulting from fire, theft, vandalism, accident, conduct of other users of the Parking Facilities and other persons, or any other Casualty or
cause. Further, Tenant understands and agrees that: (i) Landlord will not be obligated to provide any traffic control, security protection or
Parking  Operator  for  the  Parking  Facilities;  (ii)  Tenant  uses  the  Parking  Facilities  at  its  own  risk;  and  (iii)  Landlord  will  not  be  liable  for
personal injury or death, or theft, loss of or damage to property. Tenant indemnifies and agrees to hold Landlord, any Parking Operator and
their  respective  agents  and  employees  harmless  from  and  against  any  and  all  claims,  demands,  and  actions  arising  out  of  the  use  of  the
Parking Facilities by Tenant and its employees and agents, whether brought by any of such persons or any other person.

15.

Tenant will ensure that any vehicle parked in any of the parking spaces will be kept in proper repair and will not leak
excessive amounts of oil or grease or any amount of gasoline. If any of the parking spaces are at any time used (i) for any purpose other than
parking as provided above, (ii) in any way or manner reasonably objectionable to Landlord, or (iii) by Tenant after default by Tenant under
the Lease, Landlord, in addition to any other rights otherwise available to Landlord, may consider such default an event of default under the
Lease.

16.

Tenant's right to use the Parking Facilities will be in common with other tenants of the Project and with other parties
permitted by Landlord to use the Parking Facilities. Landlord reserves the right to assign and reassign, from time to time, particular parking
spaces for use by persons selected by Landlord, provided that Tenant's rights under the Lease are preserved. Landlord will not be liable to
Tenant  for  any  unavailability  of  Tenant's  designated  spaces,  if  any,  nor  will  any  unavailability  entitle  Tenant  to  any  refund,  deduction,  or
allowance. Tenant will not park in any numbered space or any space designated as: RESERVED, HANDICAPPED, VISITORS ONLY, or
LIMITED TIME PARKING (or similar designation).

17.

If the Parking Facilities are damaged or destroyed, or if the use of the Parking Facilities is limited or prohibited by any
governmental authority, or the use or operation of the Parking Facilities is limited or prevented by strikes or other labor difficulties or other
causes  beyond  Landlord's  reasonable  control,  Tenant's  inability  to  use  the  parking  spaces  will  not  subject  Landlord  (and/or  the  Parking
Operator, as the case may be) to any liability to Tenant and will not relieve Tenant of any of its obligations under the Lease and the Lease will
remain  in  full  force  and  effect.  Tenant  will  pay  to  Landlord  upon  demand,  and  Tenant  indemnifies  Landlord  against,  any  and  all  loss  or
damage  to  the  Parking  Facilities,  or  any  equipment,  fixtures,  or  signs  used  in  connection  with  the  Parking  Facilities  and  any  adjoining
buildings or structures caused by Tenant or any of its employees and agents.

18.

Tenant  has  no  right  to  assign  or  sublicense  any  of  its  rights  in  the  parking  spaces,  except  as  part  of  a  permitted

assignment or sublease of the Lease; however, Tenant may allocate the parking spaces among its employees.

Landlord may waive any one or more of these Rules and Regulations and Parking Rules and Regulations for the benefit of any
particular tenant or tenants, but no such waiver by Landlord shall be construed as a waiver of such Rules and Regulations and/or Parking
Rules and Regulations in favor of any other tenant or tenants, nor prevent Landlord from thereafter enforcing any such Rules or Regulations
and/or Parking Rules and Regulations against any or all tenants of the Project. Landlord reserves the right at any time to change or rescind
any one or more of these Rules and Regulations and/or Parking Rules and Regulations, or to make such other and further reasonable Rules
and Regulations and/or Parking Rules and Regulations as in Landlord's judgment may from time to time be necessary for the management,
safety,  care  and  cleanliness  of  the  Premises,  Building  and  Project,  and  for  the  preservation  of  good  order  therein,  as  well  as  for  the
convenience of other occupants and tenants therein. Landlord shall not be responsible to Tenant or to any other person for the nonobservance
of the Rules and Regulations and/or Parking Rules and Regulations by another tenant or other person. Tenant shall be deemed to have read
these Rules and Regulations and Parking Rules and Regulations and to have agreed to abide by them as a condition of its occupancy of the
Premises.

EXHIBIT B

-5-

 
 
 
 
EXHIBIT C

AMENDMENT TO OFFICE LEASE

This AMENDMENT TO OFFICE LEASE ("Amendment") is made and entered into effective as of ________________, ______,
by and between KW FUND VI-SAN MATEO, LLC, a Delaware limited liability company ("Landlord"), and SIERRA ONCOLOGY, INC., a
Delaware corporation ("Tenant").

R E C I T A L S

A.

Landlord and Tenant entered into that certain Office Lease dated as of December 10, 2020 (the "Lease") pursuant to
which Landlord leased to Tenant, and Tenant leased from Landlord, certain "Premises", as described in the Lease, known as Suite 110 of the
Building located at 1820 Gateway Drive, San Mateo, California 94404.

B.
such terms in the Lease.

Except as otherwise set forth herein, all capitalized terms used in this Amendment shall have the same meaning given

C.

Landlord  and  Tenant  desire  to  amend  the  Lease  to  confirm,  among  other  things,  the  commencement  and  expiration

dates of the Lease Term, as hereinafter provided.

NOW, THEREFORE, in consideration of the foregoing Recitals and the mutual covenants contained herein, and for other good

and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1.

Premises. The Premises contains approximately 3,792 rentable square feet.

2.

Confirmation of Dates. The parties hereby confirm that (a) Landlord’s Work is Substantially Completed, (b) the Lease
Term for the Lease commenced as of ________________ (the "Lease Commencement Date") for a term of forty-eight (48) months ending on
___________________  (unless  sooner  terminated  or  extended  as  provided  in  the  Lease),  and  (c)  in  accordance  with  the  Lease,  Rent
commenced to accrue on ____________________________.

3.

Base Rent. During the Lease Term, the Base Rent payable by Tenant for the Premises shall be set forth in the following

schedule subject, however, to Section 3.2 of the Lease:

Period
/     /     -     /     /

/     /     -     /     /

/     /     -     /     /

/     /     -     /     /

Annual
Base Rent
$211,593.60

$217,941.36

$224,479.68

$231,214.08

Monthly Installment of
Base Rent
$17,632.80

$18,161.78

$18,706.64

$19,267.84

4.

Tenant's Share. During the Lease Term, Tenant's Share of Operating Expenses and Tax Expenses shall be 5.11% (3,792

rentable square feet within the Premises/74,176 rentable square feet within the Building).

5.

No  Further  Modification.  Except  as  set  forth  in  this  Amendment,  all  of  the  terms  and  provisions  of  the  Lease  shall

remain unmodified and in full force and effect.

[SIGNATURES APPEAR ON FOLLOWING PAGE]

EXHIBIT C

-1-

 
 
 
 
 
 
IN WITNESS WHEREOF, this Amendment has been executed as of the day and year first above

written.

"Landlord"

KW FUND VI-SAN MATEO, LLC,
a Delaware limited liability company

By:

  Name:
  Its:

"Tenant"

SIERRA ONCOLOGY, INC.,
a Delaware corporation

By:

By:

  Name:
  Its:

  Name:
  Its:

EXHIBIT C

-2-

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT D

FORM OF TENANT'S ESTOPPEL CERTIFICATE

The  undersigned,  as  Tenant  under  that  certain  Office  Lease  (the  "Lease")  made  and  entered  into  as  of  December  10,  2020  and
between KW FUND VI-SAN MATEO, LLC, a Delaware limited liability company, as Landlord, and the undersigned as Tenant, for Premises
on the first (1st) floor of the Building located at 1820 Gateway Drive, San Mateo, California, hereby certifies as follows:

1.

Attached hereto as Exhibit A is a true and correct copy of the Lease and all amendments and modifications thereto. The

documents contained in Exhibit A represent the entire agreement between the parties as to the Premises.

2.

The undersigned has commenced occupancy of the Premises described in the Lease, currently occupies the Premises,

and the Lease Term commenced on __________.

3.
provided in Exhibit A.

The  Lease  is  in  full  force  and  effect  and  has  not  been  modified,  supplemented  or  amended  in  any  way  except  as

4.

Tenant has not transferred, assigned, or sublet any portion of the Premises nor entered into any license or concession

agreements with respect thereto except as follows:

5.

Tenant  shall  not  modify  the  documents  contained  in  Exhibit  A  or  prepay  any  amounts  owing  under  the  Lease  to

Landlord in excess of thirty (30) days without the prior written consent of Landlord's mortgagee.

6.

7.

8.

Base Rent became payable on _____________.

The Lease Term expires on _______________.

To the undersigned’s knowledge, all conditions of the Lease to be performed by Landlord necessary to the enforceability

of the Lease have been satisfied and Landlord is not in default thereunder.

9.

10.

No rental has been paid in advance and no security has been deposited with Landlord except as provided in the Lease.

To the undersigned’s knowledge, as of the date hereof, there are no existing defenses or offsets that the undersigned

has, which preclude enforcement of the Lease by Landlord.

11.

All monthly installments of Base Rent, all Additional Rent and all monthly installments of estimated Additional Rent

have been paid when due through ________________. The current monthly installment of Base Rent is $____________.

12.

outstanding 
except:                                                                                               [If left blank, then "None"]

improvement 

allowances 

unpaid 

and 

There  are  no  unfinished  tenant  improvements  required  to  be  completed  by  Landlord  as  of  the  date  hereof  or  any
hereof
owing 

Tenant 

tenant 

date 

the 

of 

as 

to 

13.

The undersigned acknowledges that this Estoppel Certificate may be delivered to Landlord's prospective mortgagee, or
a  prospective  purchaser,  and  acknowledges  that  it  recognizes  that  if  same  is  done,  said  mortgagee,  prospective  mortgagee,  or  prospective
purchaser will be relying upon the statements contained herein in making the loan or acquiring the property of which the Premises are a part,
and in accepting an assignment of the Lease as collateral security, and that receipt by it of this certificate is a condition of making of the loan
or acquisition of such property.

14.

If Tenant is a corporation or partnership, each individual executing this Estoppel Certificate on behalf of Tenant hereby
represents and warrants that Tenant is a duly formed and existing entity qualified to do business in California and that Tenant has full right
and authority to execute and deliver this Estoppel Certificate and that each person signing on behalf of Tenant is authorized to do so.

Executed at ____________________ on the ______ day of ______________, 20__.

"Tenant"

SIERRA ONCOLOGY, INC.,
a Delaware corporation

By:

  Name:
  Its:

 
 
 
 
 
 
 
 
   
 
   
 
 
LIST OF SUBSIDIARIES OF SIERRA ONCOLOGY, INC.

EXHIBIT 21.1

Subsidiary
Sierra Oncology Canada ULC

  Jurisdiction of Incorporation or Organization
  Canada, British Columbia

 
 
   
 
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-205693, 333-209897, 333-216392, 333-223253, 333-228263, 333-
229933, 333-236854 and 333-241414 on Form S-8, and Registration Statement Nos. 333-225650, 333-234554 and 333-241443 on Form S-3 of our report
dated March 11, 2021, relating to the consolidated financial statements of Sierra Oncology, Inc. and subsidiaries (the “Company”) appearing in this Annual
Report on Form 10-K of the Company for the year ended December 31, 2020.

EXHIBIT 23.1

/s/ Deloitte & Touche LLP

Grand Rapids, Michigan
March 11, 2021

 
CERTIFICATION OF PERIODIC REPORT UNDER SECTION 302 OF
THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 31.1

I, Stephen Dilly, certify that:

1. I have reviewed this Annual Report on Form 10-K of Sierra Oncology, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange
Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the
registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of
the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal
quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over
financial reporting.

Date: March 11, 2021

/s/ Stephen Dilly
  Dr. Stephen Dilly
  Chief Executive Officer
  (Principal Executive Officer)

 
 
 
 
 
 
 
 
 
CERTIFICATION OF PERIODIC REPORT UNDER SECTION 302 OF
THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 31.2

I, Sukhi Jagpal, certify that:

1. I have reviewed this Annual Report on Form 10-K of Sierra Oncology, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the
statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the
financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange
Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the
registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of
the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal
quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the
registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over
financial reporting.

Date: March 11, 2021

/s/ Sukhi Jagpal

  Sukhi Jagpal
  Chief Financial Officer
  (Principal Financial Officer)

 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 32.1

I, Stephen Dilly, Chief Executive Officer of Sierra Oncology, Inc. (Company), do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant
to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

•

•

the Annual Report on Form 10-K of the Company for the year ended December 31, 2020 (Report), as filed with the Securities and
Exchange Commission, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the
Company for the periods presented therein.

Date: March 11, 2021

/s/ Stephen Dilly
Dr. Stephen Dilly
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

EXHIBIT 32.2

I, Sukhi Jagpal, Chief Financial Officer of Sierra Oncology, Inc. (Company), do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to
Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

•

•

the Annual Report on Form 10-K of the Company for the year ended December 31, 2020 (Report), as filed with the Securities and
Exchange Commission, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the
Company for the periods presented therein.

Date: March 11, 2021

/s/ Sukhi Jagpal
Sukhi Jagpal
Chief Financial Officer
(Principal Financial Officer)