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Calithera Biosciences

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FY2019 Annual Report · Calithera Biosciences
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2019(cid:3)Annual(cid:3)Report(cid:3)

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UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 

FORM 10-K 

(Mark One) 
(cid:3) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 

ACT OF 1934 

(cid:4) TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 

EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD FROM TO 

For the fiscal year ended December 31, 2019 
OR 

Commission File Number 001-36644 

CALITHERA BIOSCIENCES, INC. 

(Exact name of Registrant as specified in its Charter) 

Delaware
(State or other jurisdiction of
incorporation or organization)

343 Oyster Point Blvd., Suite 200
South San Francisco, CA
(Address of principal executive offices)

27-2366329
(I.R.S. Employer
Identification No.)

94080
(Zip Code)

Registrant’s telephone number, including area code: (650) 870-1000 

Common Stock, Par Value $0.0001 Per Share
(Title of each class)

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

The Nasdaq Global Select Market
(Name of each exchange on which registered)

Securities registered pursuant to section 12(g) of the Act: None 
Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    YES   (cid:4)   NO  (cid:3) 
Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.    YES  (cid:4)    NO  (cid:3) 
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  (cid:3)    NO  (cid:4) 
Indicate by check mark whether the Registrant has submitted electronically 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 
such files).    YES  (cid:3)    NO  (cid:4) 
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, 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
Emerging growth company

(cid:4)
(cid:4)
(cid:4)

Accelerated filer
Smaller reporting company

(cid:3)
(cid:3)

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.  (cid:4)
Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    YES  (cid:4)    NO  (cid:3) 
The aggregate market value of the registrant’s common stock held by non-affiliates of the registrant as of the last business day of the registrant’s 
most recently completed second fiscal quarter was approximately $189.4 million, based on the closing price of the registrant’s common stock on the 
Nasdaq Global Select Market of $3.90 per share.  

The number of shares of Registrant’s Common Stock outstanding as of March 4, 2020, was 64,683,621.

DOCUMENTS INCORPORATED BY REFERENCE

The Registrant’s Definitive Proxy Statement relating to the 2020 Annual Meeting of Stockholders will be filed with the Securities and Exchange 
Commission within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K and portions of such are incorporated by 
reference into Part III of this Annual Report on Form 10-K. 

 
 
 
 
 
 
 
 
 
Table of Contents

PART I
Item 1.
Business.........................................................................................................................................................................
Item 1A. Risk Factors ...................................................................................................................................................................
Item 1B. Unresolved Staff Comments..........................................................................................................................................
Properties.......................................................................................................................................................................
Item 2.
Item 3.
Legal Proceedings .........................................................................................................................................................
Item 4. Mine Safety Disclosures................................................................................................................................................

PART II

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

Securities .......................................................................................................................................................................
Selected Financial Data .................................................................................................................................................
Item 6.
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations .......................................
Item 7A. Quantitative and Qualitative Disclosures About Market Risk ......................................................................................
Consolidated Financial Statements and Supplementary Data .......................................................................................
Item 8.
Changes in and Disagreements With Accountants on Accounting and Financial Disclosure ......................................
Item 9.
Item 9A. Controls and Procedures................................................................................................................................................
Item 9B. Other Information..........................................................................................................................................................

PART III  

Item 10. Directors, Executive Officers and Corporate Governance ............................................................................................
Item 11. Executive Compensation ...............................................................................................................................................
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters .....................
Item 13. Certain Relationships and Related Transactions, and Director Independence..............................................................
Item 14. Principal Accounting Fees and Services .......................................................................................................................

PART IV  

Item 15. Exhibits, Financial Statement Schedules.......................................................................................................................
Signatures ......................................................................................................................................................................

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CAUTIONARY INFORMATION REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K for the year ended December 31, 2019, contains forward-looking statements within the 
meaning of Section 27A of the Securities Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange 
Act of 1934, as amended, or the Exchange Act, which are subject to the “safe harbor” created by those sections, concerning our 
business, operations, and financial performance and condition as well as our plans, objectives, and expectations for business 
operations and financial performance and condition. Any statements contained herein that are not of historical facts may be deemed 
to be forward-looking statements. You can identify these statements by words such as “anticipate,” “assume,” “believe,” “could,” 
“estimate,” “expect,” “intend,” “may,” “plan,” “should,” “will,” “would,” and other similar expressions that are predictions of or 
indicate future events and future trends. These forward-looking statements are based on current expectations, estimates, forecasts, 
and projections about our business and the industry in which we operate and management's beliefs and assumptions and are not 
guarantees of future performance or development and involve known and unknown risks, uncertainties, and other factors that are in 
some cases beyond our control. As a result, any or all of our forward-looking statements in this Annual Report on Form 10-K may 
turn out to be inaccurate. Factors that could materially affect our business operations and financial performance and condition 
include, but are not limited to, those risks and uncertainties described herein under “Item 1A - Risk Factors.” You are urged to 
consider these factors carefully in evaluating the forward-looking statements and are cautioned not to place undue reliance on the 
forward-looking statements. The forward-looking statements are based on information available to us as of the filing date of this 
Annual Report on Form 10-K. Unless required by law, we do not intend to publicly update or revise any forward-looking statements 
to reflect new information or future events or otherwise. You should, however, review the factors and risks we describe in the reports 
we will file from time to time with the Securities and Exchange Commission, or the SEC, after the date of this Annual Report on Form 
10-K.

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Item 1.

Business. 

Overview

PART I

We are a clinical-stage bio-pharmaceutical company focused on fighting cancer and other life-threatening diseases by 
discovering and developing novel small molecule drugs that target cellular metabolism. Tumor metabolism and immuno-oncology 
have emerged as promising new fields for cancer drug discovery, and recent clinical successes with therapeutic agents in each field 
have created fundamentally new potential therapies for cancer patients. With our unique approach, we have established a broad 
pipeline of small molecule drug candidates that target enzymes controlling metabolically critical pathways in tumor cells and immune 
cells. We have multiple internally discovered clinical stage compounds that are all enzyme inhibitors. While we are primarily focused 
on oncology, we may opportunistically develop therapeutics outside of oncology where we can leverage our existing expertise in 
immune cell metabolism to treat diseases with unmet need.

Through genetic mutations that alter fundamental metabolic pathways, cancer cells can acquire the ability to grow in an 

uncontrolled manner, but they also acquire nutrient dependencies that can differentiate them from normal cells. Targeting these 
nutrient dependencies by inhibiting specific metabolic pathways in cancer cells is a novel therapeutic approach to blocking the 
uncontrolled growth of tumors. Our lead product candidate, telaglenastat (CB-839), takes advantage of the critical dependency many 
cancers have on the nutrient glutamine for growth and survival. We believe telaglenastat has the potential to be an important new 
therapeutic agent with a novel mechanism of action for the treatment of a broad range of cancers, and is the first selective allosteric 
glutaminase inhibitor to enter clinical trials. We retain all commercial rights to telaglenastat and have been granted a U.S. patent, 
which includes composition of matter coverage for telaglenastat through 2032.

We are currently developing telaglenastat in combination with standard therapies in a select set of solid tumors. Our lead 

development pathway is in renal cell carcinoma, or RCC, where we are evaluating telaglenastat in the CANTATA trial 
(NCT03428217), a global, randomized, double-blind trial designed to evaluate the safety and efficacy of telaglenastat in combination 
with cabozantinib versus placebo with cabozantinib in patients with advanced clear cell RCC patients who have been treated with one 
or two prior lines of systemic therapy. The primary endpoint is progression-free survival, or PFS, by blinded independent review, and 
a key secondary endpoint is overall survival. The trial is designed with registrational intent. The U.S. Food and Drug Administration, 
or FDA, has granted Fast Track designation to telaglenastat in combination with cabozantinib, for the treatment of patients with 
metastatic RCC who have received one or two prior lines of therapy. The CANTATA trial completed enrollment of 444 patients in 
October 2019 and we plan to report topline efficacy and safety data in late third quarter or fourth quarter 2020. In June 2019, we 
reported the results of the randomized, double blind, placebo-controlled ENTRATA study of telaglenastat, which met its primary 
endpoint. ENTRATA provides the first clinical proof of concept for telaglenastat in a randomized trial. 

We also plan to develop telaglenastat for the treatment of NRF2/KEAP1 mutated non-small cell lung cancer (NSCLC). The 

NRF2/KEAP1 pathway is known to drive the development of certain cancers, including a significant proportion of NSCLC, through 
the regulation of reactive oxygen species (ROS) in a manner that makes cells highly dependent on glutaminase activity. We plan to 
initiate a randomized, placebo controlled trial (NCT04250545) in first line patients with non-squamous NSCLC with tumors that 
harbor mutations in either the KEAP1 or NRF2 gene in the first half of 2020. We will be evaluating the combination of telaglenastat 
plus pembrolizumab and standard chemotherapy versus placebo with pembrolizumab and standard chemotherapy. We plan to present 
interim data from this trial in 2021. 

Our product candidate, INCB001158 is an oral inhibitor of arginase, an enzyme that depletes the amino acid arginine, a key 
metabolic nutrient for T-cells. INCB001158 was discovered by Calithera and is being co-developed with Incyte Corporation, or Incyte, 
for oncology and hematology indications, and is currently being evaluated in Phase 1/2 trials as a monotherapy and in combination 
with other anti-cancer agents. Arginase depletes arginine, a nutrient that is critical for the activation and proliferation of the body’s 
cancer-fighting immune cells, such as cytotoxic T-cells and natural killer (NK)-cells. In some physiological circumstances such as 
maternal-fetal immune tolerance, arginase-mediated depletion of arginine plays an important role in suppressing the immune system. 
But in many tumors, arginase-expressing myeloid cells accumulate and maintain an immunosuppressive environment, blocking the 
ability of T-cells and NK-cells to kill cancer cells. We have demonstrated that arginase-expressing myeloid cells can accumulate in a 
number of cancers, including lung, gastrointestinal, bladder, renal, squamous cell head and neck and acute myeloid leukemia. We 
believe that inhibitors of arginase can promote an anti-tumor immune response by restoring arginine levels, thereby allowing 
activation of the body’s own immune cells, including cytotoxic T-cells and NK-cells.

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Arginase inhibitors also have potential in the treatment of cystic fibrosis; accordingly, we have selected CB-280, a unique oral 

arginase inhibitor, for the treatment of cystic fibrosis, or CF, patients. It is a novel oral arginase inhibitor which is solely owned by 
Calithera. We have completed a Phase 1 Single Ascending Dose trial to evaluate the safety, tolerability and pharmacokinetic profile of 
oral CB-280 in healthy volunteers and plan to open a study in CF patients in the first half of 2020. We plan to present data from this 
trial in 2021.

We are a fully integrated biopharmaceutical company with expertise in biology and chemistry, and our ongoing research efforts 

are focused on discovering additional product candidates for the treatment of cancer and other life-threatening diseases. We have 
discovered and developed the clinical candidate CB-708, a potent, selective, orally administered small molecule that inhibits CD73, an 
enzyme that converts adenosine monophosphate to generate the immunosuppressive agent adenosine. We have also developed an 
investigational first-in-class, potent, orally administered IL4I1 inhibitor as a novel immuno-oncology approach to cancer. 

Our Strategy

Our goal is to be the leader in the discovery, development and commercialization of novel small molecule drugs to address 
unmet medical needs resulting from diseases affecting tumor and immune cell biology. Leveraging the potentially broad applicability 
of our tumor and immune metabolism expertise, our primary focus is in oncology, though we may opportunistically develop 
therapeutics outside of oncology where we can utilize existing expertise to treat diseases with unmet needs. We are in the early 
planning stages of preparing to build a commercial team to execute successfully on our commercialization plan for telaglenastat for 
RCC, if approved. The key elements of our strategy are to:

•

•

•

•

•

Advance and complete the clinical development of telaglenastat for RCC. We are developing telaglenastat for the 
treatment of RCC in combination regimens with standard therapeutics. Telaglenastat is being investigated in the 
CANTATA trial (NCT03428217), which is designed with registrational intent. It is a global, randomized, double-blind 
trial of 444 patients, that evaluates the safety and efficacy of telaglenastat in combination with cabozantinib versus 
placebo with cabozantinib in patients with advanced clear cell RCC who have been treated with one or two prior lines of 
systemic therapy, including at least one vascular endothelial growth factor tyrosine kinase inhibitor or the combination of 
nivolumab and ipilimumab. We completed enrollment of the CANTATA trial in October 2019 and expect to release top-
line results in late third quarter or fourth quarter 2020. We plan to capitalize on the opportunity to potentially 
commercialize telaglenastat for RCC in the United States, where we believe we can successfully compete.

Develop telaglenastat for the treatment of NRF2/KEAP1 mutated tumors including non-small cell lung cancer 
(NSCLC). The NRF2/KEAP1 pathway is known to drive the development of certain cancers, including 20-25% of 
NSCLC, through the regulation of reactive oxygen species, or ROS, in a manner that requires glutaminase activity. 
Multiple in vivo preclinical models have demonstrated that activation of this pathway accelerates tumor formation and 
growth. In addition to making tumor models more aggressive, the activation of the NRF2/KEAP1 pathway in these 
models also makes them very sensitive to the inhibition of glutaminase activity by telaglenastat (CB-839). The clear 
mechanistic rationale, strong preclinical data, and high unmet medical need in the NSCLC population have motivated a 
clinical study that will evaluate telaglenastat, in combination with standard of care chemo-immunotherapy in front line 
NSCLC patients with tumors that harbor mutations in either KEAP1 or NRF2 that activate this pathway. This trial is 
expected to begin in the first half of 2020. 

Advance the clinical development of telaglenastat for the treatment of additional cancers.  Mutated oncogenes can 
make cancer cells dependent on glutamine for growth and survival and glutaminase inhibitors have synergistic effects 
when combined with many cancer drugs. Through the use of clinical collaborations, National Cancer Institute and 
investigator-sponsored exploratory studies, we are developing telaglenastat for additional oncology indications. We have a 
clinical collaboration with Pfizer to evaluate Pfizer’s CDK4/6 inhibitor palbociclib, also known as IBRANCE®, and the 
dual-mechanism poly (ADP-ribose) polymerase (PARP) inhibitor talazoparib also known as TALZENNA®, each in 
combination with telaglenastat. 

Advance the clinical development for INCB001158 for the treatment of cancer with our partner Incyte. 
INCB001158, an internally discovered molecule, is being evaluated in multiple clinical trials for the treatment of patients 
with solid tumors both as a monotherapy, in combination with anti-PD-1 immunotherapy, and in multiple chemotherapy 
regimens. INCB001158 is being developed as part of a collaboration and license agreement with Incyte.  

Advance the clinical development of CB-280 as a new treatment modality for cystic fibrosis, or CF. Arginase and 
the amino acid arginine are believed to be critical in the pathology of cystic fibrosis. Neutrophils accumulate in the lungs 
of CF patients and secrete arginase, an enzyme that metabolizes arginine and impairs production of nitric oxide, while 
generating arginine metabolites that may impair lung function. CB-280 is an orally administered small molecule inhibitor 
of arginase. We have completed a Phase 1 trial to evaluate the safety, tolerability and pharmacokinetic profile of oral CB-
280 in healthy volunteers, and plan to open a study in CF patients in the first half of 2020. 

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•

Apply our insights in tumor metabolism and immuno-oncology to discover and develop additional targets beyond 
our current clinical pipeline.  Our research focus has remained on metabolic enzymes, but our portfolio has diversified 
into the therapeutic areas of oncology, immuno-oncology and cystic fibrosis. We have two earlier stage immunotherapy 
programs which include our clinical candidate CB-708, which targets CD73, an enzyme in the tumor microenvironment 
that produces the immuno-suppressive metabolite adenosine, as well an IL4I1 inhibitor program.

Our Research and Development Programs

The following table summarizes our ongoing and planned clinical trials for our lead programs. We also intend to develop 

additional product candidates from our research and discovery efforts in these fields. 

DISCOVERY

PRE-IND

PHASE 1

PHASE 2

REGISTRATIONAL

Pipeline

Glutaminase Inhibitor Telaglenastat (CB-839)

mRCC + cabozantinib CANTATA

mRCC + everolimus ENTRATA

Lung NRF2/Keap1 mutation

Solid Tumors + talazoparib*

Solid Tumors + palbociclib*

Multiple Investigator Sponsored Trials (ISTs)

Arginase Inhibitor INCB001158 (CB-1158)

Solid Tumors + pembrolizumab

Solid Tumors + chemotherapy

Multiple Myeloma + daratumumab

Arginase Inhibitor CB-280: Cystic Fibrosis

CD73 Inhibitor CB-708: lmmuno-Oncology

IL4l1 Inhibitor: lmmuno-Oncology

* In collaboration with Pfizer

The Evolution of Cancer Therapeutic Agents

Cancer is characterized by the uncontrolled growth of aberrant cells in the body, leading to the invasion of essential organs and 

often death. Unlike normal cells, which grow only in response to carefully regulated signals from the body, cancer cells are able to 
proliferate largely without external signals. Cancer cells have gained this ability as the result of genetic alterations that change protein 
expression or function. Invasive tumors, also known as metastatic tumors, which are the greatest threat to patients, typically have 
multiple mutations, deletions or amplifications of genes encoding key proteins that regulate cell growth. These alterations allow the 
cancer cell to grow, invade other tissues, and avoid recognition and destruction by the body’s immune system.

Initially, the pharmacological treatment of cancer utilized non-specific cytotoxic agents that targeted all rapidly dividing cells, 
including normal cells. These non-specific cytotoxic agents have anti-tumor effects but their use is often limited by severe toxicities. 
As the understanding of the proteins and pathways that enable cancer cells to thrive has evolved, newer more targeted agents have 
been developed that block specific proteins that are activated in cancer cells.

Tumor metabolism and tumor immunology represent two emerging fields for the development of therapeutics that can address 

the challenges presented in treating cancers with multiple mutations or with mutations that are difficult to inhibit. Certain fundamental 
changes in the metabolic pathways of cancer cells are observed in many cancer types with different mutational backgrounds. 
Emerging therapeutic agents that can take advantage of these changes in metabolism have the potential to act broadly against many 
cancers. Similarly, genetically diverse tumor types have developed mechanisms to escape destruction by the body’s immune system. 
We believe additional opportunities exist to develop novel therapeutics that can further enhance the cancer-fighting ability of the 
immune system, either as single agents, or in combination with approved therapeutics.

Rationale for Targeting Tumor Cell Metabolism

Cancer cells acquire the ability to grow rapidly and spread to new sites in the body by accumulating genetic alterations in 

important genes that control growth and survival. These same genetic changes also result in altered metabolic pathways within the 
cancer cells that fuel the high demand for energy and the production of new proteins, lipids, RNA and DNA needed for rapid 

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proliferation. We and others have observed that many types of cancer cells develop a unique dependence on specific metabolic 
pathways upon which normal cells are less reliant. Accordingly, when these metabolic pathways are blocked, cancer cells are 
essentially starved of critical nutrients and stop growing or die, whereas normal cells are largely unaffected.

Rewired metabolic signaling pathways are a hallmark of many cancers. Targeting oncometabolism is a novel therapeutic 
approach to blocking cancer growth. Many cancer cells excessively consume nutrients, such as glutamine and glucose, to meet 
increased metabolic demands. Glutamine is a critical fuel for the metabolic demands of cancer cell growth. Glutaminase catalyzes the 
conversion of glutamine to glutamate and is frequently overexpressed in cancer. Cancer cells can become dependent on glutaminase in 
response to oncogene signaling and thus glutaminase is emerging as a novel target for cancer therapeutics.

Our Programs

Our Glutaminase Inhibitor Program

It has been known for more than 50 years that most cancer cells require glutamine to thrive. Glutaminase converts glutamine to 
glutamate, an amino acid required by cells for several essential functions. Many cancer cells, unlike normal cells, are dependent upon 
the enzyme glutaminase to make sufficient amounts of glutamate to grow and survive. This higher dependency upon the glutaminase 
pathway is likely due to an alternate use of the tricarboxylic acid cycle (also known as TCA or Krebs cycle) in cancer cells to generate 
energy and metabolic intermediates required for cell growth and survival. Glutaminase inhibition in tumors implanted in animals leads 
to tumor shrinkage and marked reduction in downstream metabolic intermediates including amino acids, nucleotides and glutathione, 
whereas these metabolic intermediates are largely unaffected in normal tissues. This supports our hypothesis that glutaminase 
inhibitors can selectively target tumors. When combined with therapeutic agents that target growth factor receptors and downstream 
signaling pathways known to increase glucose utilization in tumor cells, it is possible to block glucose and glutamine utilization by 
tumor cells, which we believe can provide an enhanced therapeutic benefit.

During an immune response, T-cell metabolism partially resembles the metabolism of cancer cells, and the need for both 
glucose and glutamine increases markedly. The expression of the checkpoint PD-1 on T-cells following activation inhibits the uptake 
and utilization of glucose, and blocks rapid proliferation. The checkpoint inhibitors that block PD-L1 or PD-1 restore the ability of T-
cells to utilize glucose. However, T-cells require both glucose and glutamine to proliferate. We believe that the accumulation of 
glutamine through the inhibition of tumor cell glutaminase has the indirect effect of supplying T-cells and NK cells with a needed 
nutrient. Since T-cell proliferation, unlike cancer cell proliferation, is not significantly inhibited by telaglenastat, we believe that 
combining telaglenastat with inhibitors of the PD-L1/PD-1 checkpoint will support the activation and expansion of cytotoxic immune 
cells in the nutrient-deprived tumor microenvironment and enhance anti-tumor responses.

Our Glutaminase Inhibitor Telaglenastat (CB-839)

Our lead product candidate, telaglenastat, takes advantage of the pronounced dependency many cancers have on the nutrient 

glutamine for growth and survival. Telaglenastat is a novel, selective glutaminase inhibitor that blocks glutamine consumption in 
tumor cells and demonstrates synergistic antitumor effects with multiple anticancer therapies in preclinical studies. 

Many tumor cells depend on this metabolic pathway for growth and survival. Telaglenastat targets an allosteric binding site that 
is highly specific for glutaminase. Inhibition of glutaminase prevents glutamine from serving its critical roles in nucleic acid synthesis, 
DNA repair, cell cycle progression, energy generation, and protection from oxidative stress. Telaglenastat produces synergistic anti-
tumor effects in preclinical studies when used in combination with multiple classes of anti-cancer therapies. Because telaglenastat has 
multiple mechanisms for impacting cellular metabolism, it has anti-tumor effects on a number of different tumor types when 
combined with a variety of different agents, including tyrosine kinase inhibitors, mTOR inhibitors, chemotherapeutic agents (such as 
platinum agents and taxanes), immune checkpoint inhibitors, CDK4/6 inhibitors and PARP inhibitors.

Telaglenastat binds to a site on glutaminase distinct from the glutamine-binding active site, making it a highly selective and 

unique allosteric inhibitor. Telaglenastat is well-tolerated in part because of this selectivity. We believe telaglenastat has the potential 
to be an important new therapeutic agent with a novel mechanism of action for the treatment of a broad range of cancers, and is the 
first selective allosteric glutaminase inhibitor currently in clinical trials. We retain all commercial rights to telaglenastat and have been 
granted a U.S. patent, which provides composition of matter coverage for telaglenastat through 2032, as well as patents applied 
for/issued in other territories.

In February 2014, we initiated three Phase 1 clinical trials to assess the safety and tolerability of telaglenastat in patients with 

solid and hematological tumors. Most patients in these trials were relapsed and refractory to multiple approved therapies. These 
studies showed that drug concentration generally increases with dose, and increasing concentration of telaglenastat in blood correlates 
with increasing inhibition of glutaminase in blood platelets and tumors. The half-life of telaglenastat in blood is approximately four 
hours. We have observed this dosing regimen provides sufficient glutaminase inhibition at steady state dosing and the average 
exposure is above levels we are targeting. Telaglenastat is dosed with food on a twice-daily regimen.

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Telaglenastat has been generally well-tolerated using doses up to 1000 mg administered either twice or three times daily. The 
primary treatment-related toxicities with monotherapy telaglenastat observed to date include fatigue, gastrointestinal events (nausea, 
vomiting, and constipation), elevations in liver function tests, or LFTs, and photophobia. The majority of these adverse events have 
been mild to moderate (Grade 1/2) in severity.

Evaluation of telaglenastat in renal cell carcinoma (RCC)

New therapeutic options are needed to slow disease progression and improve overall survival in patients with advanced RCC. 

Metastatic RCC is associated with a poor quality of life and high mortality, with a 5-year survival rate of 12%. According to the 
American Cancer Society, 73,750 new cases of RCC are estimated to be diagnosed in the United States in 2020. It is the sixth most 
common cancer diagnosed in men. Approximately 16% of patients with RCC present with metastatic disease; however, up to 40% of 
patients develop metastatic disease after primary surgical treatment of localized RCC. New agents with novel mechanisms of action 
are needed despite recent advances with antiangiogenic and immune therapies.

RCC commonly exhibits genetically-driven metabolic alterations that increase their dependence on glutamine, which creates 

opportunities to develop novel agents targeting glutamine metabolism that could improve patient outcomes. Clear cell RCC, the most 
common RCC subtype comprising 75-85% of patients, is closely associated with inactivation of the VHL tumor suppressor gene, 
which can lead to activation of hypoxia-related pathways through HIFs (hypoxia-inducible transcriptional factors). VHL-deficient 
cells and tumors are dependent on glutamine because of an HIF-mediated loss of ability to make fatty acids from glucose, which is a 
characteristic that confers sensitivity to glutamine depletion. Targeted therapies that deprive VHL-deficient RCC cells of glutamine 
could prove beneficial in the treatment of VHL-deficient tumors. Accordingly, we believe that most patients with RCC tumors will 
have increased susceptibility to inhibition of glutaminase with telaglenastat. 

The telaglenastat development program includes two Phase 2 randomized double blind, placebo-controlled clinical trials of 
telaglenastat for the treatment of RCC. Telaglenastat is being investigated in the CANTATA trial (NCT03428217), which is designed 
with registrational intent. It is a global, randomized, double-blind trial of 444 patients, designed to evaluate the safety and efficacy of 
telaglenastat in combination with cabozantinib versus placebo with cabozantinib in patients with advanced clear cell RCC who have 
been treated with one or two prior lines of systemic therapy, including at least one vascular endothelial growth factor tyrosine kinase 
inhibitor or the combination of nivolumab and ipilimumab. The primary endpoint is PFS by blinded independent review, and a key 
secondary endpoint is overall survival. Patients will be stratified by International Metastatic Renal Cell Carcinoma Database 
Consortium, or IMDC, risk category and prior treatment with anti-PD(L)1 therapy. The study has 85% power to show a 31% 
improvement in progression free survival. In support of the CANTATA trial, Exelixis, Inc. has entered into a material supply 
agreement with us for cabozantinib. The U.S. Food and Drug Administration, or FDA, has granted Fast Track designation to 
telaglenastat in combination with cabozantinib, for the treatment of patients with metastatic RCC who have received one or two prior 
lines of therapy. We completed enrollment of the CANTATA trial in October 2019, and we expect to release top-line results in late 
third quarter or fourth quarter 2020.

The CANTATA trial was initiated following the completion of a Phase 1b trial of telaglenastat in combination with 

cabozantinib in RCC. Among 12 evaluable late-line RCC patients treated with telaglenastat and cabozantinib, including 10 clear cell 
patients and two papillary patients, 100% of evaluable patients experienced tumor shrinkage and had disease control. The response 
rate was 50% in the clear cell patient population, which compares favorably to historical data with cabozantinib monotherapy in which 
the overall response rate was 17% in Exelixis’ METEOR trial. Patients enrolled in this trial had advanced or metastatic disease and 
had received a median of three prior treatments, which included tyrosine kinase inhibitors, mTOR inhibitors, and immune checkpoint 
inhibitors. Patients were administered telaglenastat in oral doses that ranged from 600-800 mg twice a day in combination with a fixed 
oral dose of cabozantinib at 60 mg once a day.

The ENTRATA trial (NCT03163667) is a Phase 2 randomized, double blind trial designed to evaluate the safety and efficacy of 
telaglenastat in combination with everolimus versus placebo with everolimus in patients with advanced clear cell RCC who have been 
treated with at least two prior lines of systemic therapy, including at least one VEGFR-targeted tyrosine kinase inhibitor (TKI). 
Patients were randomized in a 2:1 ratio. The trial opened for enrollment in August 2017 and completed enrollment in January 2019. 
The trial enrolled 69 patients at multiple centers in the United States and results were presented earlier this year. Key demographics 
were balanced between the two treatment arms. Patients enrolled were heavily pre-treated with a median of three prior lines of therapy 
for advanced metastatic disease including 70% (72% vs. 65% in telaglenastat and placebo arms, respectively) with two or more prior 
TKIs, and 68% (70% vs. 65%) with intermediate/poor MSKCC prognostic score. Eighty-eight percent of patients received prior PD-
1/PD-L1 therapy (91% vs. 83%). Telaglenastat, when added to everolimus, doubled the median PFS to 3.8 months as compared to 1.9 
months for everolimus alone and reduced the risk of disease progression or death by 36% (HR=0.64, p=0.079 one-sided). The primary 
endpoint of the trial was PFS per investigator assessment with a predetermined threshold of p (cid:3) 0.2 one-sided. Overall response per 
Response Evaluation Criteria in Solid Tumors version 1.1 (RECIST v.1.1) was 2.2% vs. 0%, and stable disease was 56.5% vs. 47.8%. 
The secondary endpoint of overall survival is not yet mature.

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Frequency of all-grade adverse events in the telaglenastat-containing arm were comparable to that of everolimus alone. Grade 3 

or higher adverse events occurred in 80.4% of patients in the telaglenastat plus everolimus arm versus 60.9% in the everolimus plus 
placebo arm. The most frequently reported Grade (cid:4) 3 adverse events in the treatment versus control arms, respectively, were anemia 
(17.4% vs. 17.4%), pneumonia (6.5% vs. 4.3%), abdominal pain (6.5% vs. 0%), thrombocytopenia (6.5% vs. 0%), and fatigue (4.3% 
vs. 8.7%). Adverse events leading to discontinuation of any study drug were comparable (28.3% vs. 30.4%).

The results of the Phase 1b trial of telaglenastat in combination with everolimus in RCC were presented in January 

2018. Twenty-four patients, with a median of 3 prior therapies, were treated and evaluable for response. Ninety-two percent (92%) of 
patients experienced control of their disease, including one patient with a partial response and 21 patients with stable disease. The 
median progression free survival was 5.8 months, which compares favorably to historical data in this patient population. Patients were 
administered telaglenastat in oral doses that ranged from 400-800 mg twice a day in combination with a fixed oral dose of everolimus 
at 10 mg once a day. The addition of telaglenastat to full-dose everolimus has been well tolerated, with a similar safety profile to the 
known profile of everolimus alone. 

Telaglenastat was evaluated as a monotherapy in an RCC cohort in the dose expansion stage of our solid tumor Phase 1 clinical 

trial. Twenty-one efficacy-evaluable RCC patients were treated with single agent telaglenastat on the BID (twice-daily) dosing 
schedule. One patient achieved a partial response with a substantial decrease in target lesions (32%), including a dramatic 
improvement in the patient’s extensive lymphadenopathy. A total of 10 patients showed stable disease or better.  

Evaluation of telaglenastat in combination in non-small cell lung cancer (NSCLC) with NRF2/KEAP1 pathway mutations

Lung cancer is one of the most common cancers with approximately 228,820 new cases and 135,720 deaths in the U.S. 

projected in 2020, according to the American Cancer Society and NSCLC is the most common type of lung cancer accounting for 84% 
of all lung cancer diagnoses. Mutations in the NRF2/KEAP1 pathway are a major driver of primary resistance in non-small cell lung 
cancer patients and occur in an estimated 20-25% of NSCLC patients. Recently presented clinical data demonstrate that activation of 
this pathway through the loss of KEAP1 function results in very poor outcomes in NSCLC patients receiving front line standard of 
care chemotherapy or chemo-immunotherapy. In a recently published observational study (Skoulidis, ASCO 2019) the survival of 
patients with KEAP1 genomic alterations treated with standard-of care first line chemo-immunotherapy was statistically significantly 
shorter when compared to patients without the mutations (7.8 months vs. 20.4 months p=0.002). 

Mutations that activate the NRF2/KEAP1 pathway can drive the development of certain cancers, including a significant 
proportion of NSCLC and HNSCC. Proliferating tumors are metabolically active and can accumulate high levels of reactive oxygen 
species (ROS). Activation of the NRF2/KEAP1 pathway induces the expression of many genes that allow the tumor to better manage 
these high levels of ROS. A key subset of these activated genes regulate the uptake and metabolism of glutamine and the synthesis of 
glutathione, making tumors that harbor these mutations dependent on the activity of glutaminase. Multiple in vivo preclinical models 
have demonstrated that activation of this pathway, through loss of KEAP1 function or a gain-of-function NRF2 mutation, accelerates 
tumor formation and spread. In addition to making tumor models more aggressive, the activation of the NRF2/KEAP1 pathway in 
these models also makes them very sensitive to the inhibition of glutaminase activity by telaglenastat. Genetic analysis of 
adenocarcinoma NSCLC tumors from patients indicate that NRF2/KEAP1 mutations occur early in tumor development. The clear 
mechanistic rationale, strong preclinical data, and high unmet medical need in the NSCLC population have motivated a randomized 
clinical study that will evaluate telaglenastat, in combination with standard of care chemo-immunotherapy in front line NSCLC 
patients with tumors that harbor mutations in either KEAP1 or NRF2 that activate this pathway. The randomized, double-blind trial 
will enroll approximately 120 patients with stage IV non-squamous NSCLC with NRF2 or KEAP1 mutation determined by next 
generation sequencing. Patients will be randomized to receive telaglenastat or placebo, in combination with pembrolizumab, 
carboplatin and pemetrexed. The study will include an initial safety run-in period. Co-primary endpoints are safety and investigator 
assessed progression-free survival, and an interim analysis is planned. This trial is expected to begin in the first half of 2020.  

Evaluation of telaglenastat in combination with talazoparib (Talzenna)

In October 2018, we announced a collaboration with Pfizer to evaluate the dual mechanism poly ADP-ribose polymeriase 
(PARP) inhibitor talazoparib (Talzenna) in combination with telaglenastat for the treatment of patients with renal cell carcinoma and 
triple negative breast cancer. PARP inhibitors block repair of single stranded DNA breaks and are active cancer agents in patients with 
DNA repair mutations. Telaglenastat synergizes with PARP inhibitors to impair DNA synthesis, enhance DNA damage, and block 
cancer cell proliferation. The combination of telaglenastat with PARP inhibitors has demonstrated synergistic activity in a number of 
preclinical cancer models, including RCC, TNBC, CRC, NSCLC, ovarian cancer and prostate cancer. There is a potential to develop 
the combination therapy in patients with or without DNA repair mutations. Based on these data, we initiated a Phase 1/2 clinical trial 
of the combination of telaglenastat plus talazoparib in patients with RCC and TNBC in March 2019.

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Evaluation of telaglenastat in combination with palbociclib (Ibrance)

In October 2018, we announced a collaboration with Pfizer to evaluate the CDK4/6 inhibitor palbociclib (Ibrance) in 
combination with telaglenastat for the treatment of patients with KRAS mutated colorectal cancer and patients with KRAS mutated 
non-small cell lung cancer. Preclinical data suggest that telaglenastat, which is designed to starve tumor cells of the key nutrient 
glutamine, synergizes with CDK4/6 inhibitors by enhancing cell cycle arrest and blocking cancer cell proliferation. The combination 
of telaglenastat with CDK4/6 inhibitors has demonstrated synergistic activity in a number of preclinical cancer models, including 
colorectal cancer (CRC), non-small cell lung carcinoma (NSCLC), triple negative breast cancer (TNBC) and ER+ breast cancer. 
Based on these data, we initiated a Phase 1/2 clinical trial of the combination of telaglenastat plus palbociclib in patients with KRAS 
mutated CRC and patients with KRAS mutated NSCLC in July 2019.

Evaluation of telaglenastat in additional indications

Telaglenastat is also the subject of several additional investigator-sponsored clinical trials and is available under the NIH/NCI 

Cancer Therapy Evaluation Program (CTEP) collaborative agreement for clinical and non-clinical studies. Investigator-sponsored 
Phase 2 trials are ongoing and recruiting patients with PIK3CA mutant CRC, RAS wild-type CRC and myelosdysplastic syndrome 
(MDS). A clinical trial in patients with PIK3CA mutant CRC is ongoing at Case Western and Cleveland Clinic. This research is 
supported by a Stand Up To Cancer Colorectal Cancer Dream Team Translational Research Grant (Grant Number: SU2C-AACR-
DT22-17). As of the June 2018 data presentation, 16 patients have been enrolled, including 12 patients with CRC. CRC patients must 
have progressed on prior fluoropyrimidine-containing therapy. In the dose escalation phase of the trial, there were no dose limiting 
toxicities and telaglenastat plus capecitabine was well tolerated at the full dose of telaglenastat. All late-line CRC patients had 
progressed on at least one prior fluoropyrimidine-containing regimen. For CRC patients with PIK3CA-mutated cancer (n=7), the 
median PFS was 26 weeks and for patients with PIK3CA wild-type cancer (n=5) the median PFS was 16 weeks (p=0.058). These 
results compare favorably to historical data in third line CRC patients receiving standard of care therapies, where the median PFS is 
approximately 8 weeks. The Phase 2 dose expansion portion of this study in patients with PIK3CA mutant colorectal cancer is 
ongoing. The clinical trial in patients with KRAS wild-type CRC is ongoing at Vanderbilt evaluating telaglenastat plus panitumumab 
in anti-EGFR-refractory patients. Dose escalation is complete and the Phase 2 portion of this trial is ongoing. The clinical trial in 
patients with newly diagnosed high risk MDS is ongoing at MD Anderson Cancer Center. Phase 2 is ongoing and an interim analysis 
was presented at the 2019 American Society of Hematology Annual meeting.

In addition to the investigator sponsored trials, a total of five NIH/NCI CTEP trials are planned or ongoing. These trials include 

the following:

•

•

•

•

•

A study of telaglenastat in combination with carfilzomib and dexamethasone for the treatment of multiple myeloma

A study of telaglenastat plus radiation therapy and temozolomide in patients with IDH mutant glioma

A study of telaglenastat plus osimertinib in patients with EGFR mutant NSCLC 

A study of telaglenastat monotherapy in patients with solid tumors with NF1, KEAP1/NRF2 or STK11 mutations

A study of telaglenastat plus sapanisertib in patients with advanced NSCLC with KEAP1/NRF2/STK11 mutations 

Preclinical Activity of Telaglenastat

Telaglenastat is a novel, selective glutaminase inhibitor that blocks glutamine consumption in tumor cells and demonstrates 

synergistic antitumor effects with multiple anticancer therapies in preclinical studies. Telaglenastat targets an allosteric binding site 
that is highly specific for glutaminase. Inhibition of glutaminase prevents glutamine from serving its critical roles in nucleic acid 
synthesis, DNA repair, cell cycle progression, energy generation, and protection from oxidative stress. Single-agent telaglenastat 
blocks growth and survival in glutamine-dependent cancer cell lines and tumor xenograft models.

At plasma concentrations of telaglenastat of 300 nM or above, maximal effects on glutamine and glutamate levels in tumors 

were observed. In contrast, normal tissues in the same animals showed only small changes in the levels of glutamine and glutamate, 
despite exposure to high levels of telaglenastat. We believe that normal cells and tissues can utilize other pathways to produce 
glutamate, whereas most tumor cells have been genetically re-wired to be highly reliant on glutaminase as their principal source of 
glutamate. This provides a potential explanation for why high doses of telaglenastat are well tolerated in animals.

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Telaglenastat produces synergistic antitumor effects in preclinical studies when used in combination with multiple classes of 

standard-of-care anticancer therapies. Telaglenastat acted synergistically when combined with drugs that target the Ras/Raf and 
PI3K/mTOR branches of growth factor signaling pathways. The two agents acting together have a greater effect on the growth and 
survival of tumor cells than either agent used separately. Telaglenastat was synergistic with the epidermal growth factor receptor, or 
EGFR, inhibitor erlotinib (marketed as Tarceva®) in non-small cell lung cancer, or NSCLC cells, with the multikinase inhibitors 
sunitinib (marketed as Sutent®), sorafenib (marketed as Nexavar®), trametinib (marketed as Mekinist®), selumetinib (in 
development), pazopanib (marketed as Votrient®), and cabozantinib (marketed as Cabometyx®) and the mTOR inhibitors everolimus 
(marketed as Afinitor®) and temsirolimus (marketed as Toricel®) in RCC, cells. We believe these synergistic activities likely result 
from the fact that growth factor pathways also control tumor metabolism and ultimately tumor cell dependence on glutamine and 
glucose.

Glutaminase inhibition blocks the formation of key metabolic intermediates needed for nucleotide synthesis in cancer cells and 

enhances the activity of DNA synthesis blocking agents, such as CDK4/6 inhibitors, and DNA repair inhibitors, such as PARP 
inhibitors. Telaglenastat is synergistic with the CDK4/6 inhibitor palbociclib in ER+, estrogen-resistant breast cancer lines, which 
results from enhanced cell cycle blockade. Furthermore, telaglenastat was recently shown to induce double-strand DNA breaks in 
tumor cells and had synergistic activity in vitro and in vivo  in RCC cell lines with the PARP inhibitor olaparib (marketed as 
Lynparza®).

Inhibition of glutaminase also results in the reduction of the antioxidant molecule glutathione. The master transcriptional 
regulator NRF2 induces more than 200 genes related to antioxidant stress including genes responsible for glutathione biosynthesis. 
Somatic mutations in the NRF2/KEAP1 pathway are present in lung cancers, head and neck cancers, hepatocellular carcinoma and 
other cancer types. Lung cancer models with NRF2/KEAP1 pathway mutations showed marked sensitivity to inhibition by 
telaglenastat which is believed to be due to pronounced dependence on tumor cell glutathione production that is blocked by 
glutaminase inhibition.

In preclinical models, telaglenastat enhances the antitumor activity of immune checkpoint inhibitors by relieving nutrient 
competition in the tumor microenvironment, which potentially supports T-cell function. Telaglenastat also acted synergistically when 
combined with I-O drugs that inhibited the PD-1/PD-L1 immune cell checkpoint. Because many tumor cells consume large quantities 
of glutamine, an important nutrient for T-cells and NK cells, the tumor microenvironment is thought to be severely depleted of this 
nutrient. We believe that T-cells and NK cells benefit indirectly from treatment with telaglenastat by the increased availability of 
glutamine in the tumor microenvironment. Telaglenastat significantly increased the number of tumor regressions observed in 
syngeneic mice bearing CT-26 colorectal tumors when used in combination with an anti-PD(cid:12)1 checkpoint inhibitor. Similar activity 
was observed when an anti-PD-L1 checkpoint inhibitor was used in combination with telaglenastat. Anti PD-1 is known to increase 
glucose utilization in T-cells, and we believe that telaglenastat, by blocking tumor consumption of glutamine, increases the 
concentration of glutamine in the tumor microenvironment to further activate and stimulate the proliferation of T-cells and NK cells.

In IND-enabling toxicity studies, telaglenastat was well tolerated, with no dose limiting toxicities observed. The plasma 
concentration of telaglenastat measured at the highest dose in rats in these studies was greater than ten-fold above the 300 nM 
concentration required in mice to achieve maximal effects on glutamine and glutamate levels in tumors and suppress tumor growth. In 
independent studies, telaglenastat was shown to distribute broadly to all tissues except the brain, indicating that glutaminase could be 
strongly inhibited in normal tissues without causing any major toxicological effects.

Our Arginase Inhibitor INCB001158

Immune surveillance is the process whereby the body identifies pathogens as well as abnormal cells that are either infected with 

viruses or have become cancerous. Upon recognition of foreign or abnormal cells, a number of immune processes are activated to 
allow the body to attack and clear cells. However, excessive or inappropriate activation of the immune system can have negative 
consequences such as autoimmune disease, inflammation, or maternal-fetal rejection. Compensatory mechanisms have evolved to 
control excessive inflammatory activity by dampening the immune stimulation. Cancerous cells that successfully evade immune 
surveillance do so, in part, by blocking or reducing immune-stimulatory and/or enhancing immune-inhibitory activities. Immuno-
oncology therapies interfere with mechanisms that tumors have used to dampen the immune response.

Tumors have evolved a number of strategies to avoid recognition and destruction by the immune system. One key mechanism is 

through suppression of cytotoxic T-cells that would otherwise attack and kill the cancer cells. Arginine is an amino acid that is 
fundamental to the function of cytotoxic T-cells. Without arginine, tumor specific cytotoxic T-cells fail to activate, proliferate, and 
mount an effective anti-tumor response.

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In response to tumor-secreted factors, myeloid-derived suppressor cells, or MDSCs, and neutrophils accumulate in the tumor 

and secrete the enzyme arginase, resulting in depletion of arginine from the tumor microenvironment. Significant infiltration by 
arginase-expressing myeloid cells has been reported in many solid tumor types including lung cancer, colorectal esophageal, bladder, 
head and neck, kidney cancer, and other tumor types. We have confirmed that arginase-expressing MDSCs are found by 
immunohistochemistry, or IHC, in a wide range of tumor types including non-small cell lung (both adenocarcinoma and squamous 
types), gastrointestinal cancers and bladder cancers. Arginase enzyme levels are elevated in the plasma of cancer patients across a 
wide range of malignancies. We believe that arginase inhibitors can promote an anti-tumor immune response by restoring arginine 
levels, thereby allowing activation of the body’s cytotoxic T-cells.

Our product candidate INCB001158, which is a potent and selective orally bioavailable inhibitor of the enzyme arginase, was 

discovered by us and is being co-developed with Incyte. Arginase depletes arginine, a nutrient that is critical for the activation and 
proliferation of the body’s cancer-fighting immune cells, such as cytotoxic T-cells and natural killer (NK)-cells. During normal 
activation of the immune system, arginase, which is expressed by suppressive myeloid immune cells, plays an important role in 
halting T-cell proliferation. But in many tumors, including lung, gastrointestinal, bladder, renal cancer, squamous cell cancer of the 
head and neck, and acute myeloid leukemia, arginase-expressing myeloid cells accumulate and maintain an immunosuppressive 
environment, blocking the ability of T-cells and NK-cells to kill cancer cells. We believe that inhibitors of arginase can promote an 
anti-tumor immune response by restoring arginine levels, thereby allowing activation of the body’s own immune cells, including 
cytotoxic T-cells and NK-cells. INCB001158 entered clinical trials in September 2016 and is currently being tested in four ongoing 
clinical trials. The first Phase 1b/2 trial (NCT02903914) is designed to evaluate the safety and recommended Phase 2 dose of 
INCB001158 as a mono-therapy and in combination with the immune checkpoint inhibitor pembrolizumab. We presented 
monotherapy data in June 2017 at the American Society of Clinical Oncology, or ASCO, annual meeting. In September 2019, data 
were presented at the European Society for Medical Oncology (ESMO) of INCB001158 as a monotherapy and in combination with 
the checkpoint inhibitor pembrolizumab in microsatellite stable (MSS) colorectal carcinoma patients. The study was designed as a 
dose escalation of INCB001158 alone and in combination with pembrolizumab followed by expansion cohorts which followed a 
Simon 2 Stage design. There were three monotherapy expansion cohorts (non-small cell lung cancer, colorectal carcinoma and other 
solid tumors) and eight combination expansion cohorts, including PD-(L)1-naïve (MSS colorectal carcinoma, head and neck cancer, 
gastric cancer, and mesothelioma) and PD-(L)1 refractory (non-small cell lung cancer, urothelial carcinoma, melanoma, and MSI 
colorectal carcinoma) patients. Results were as of the data cut-off of July 22, 2019.

Efficacy results for the pembrolizumab combination were presented for the PD-(L)1-naïve MSS colorectal carcinoma (CRC) 
patient cohort, which has advanced to stage 2 of a Simon 2-stage design. Among 43 response-evaluable patients who had received a 
median of 3 prior therapies, 3 patients achieved a confirmed partial response (7%); the historical overall response rate is 0-1% in third-
line (and beyond) MSS CRC patients treated with checkpoint inhibitor therapies. Two of the three responders are ongoing at the time 
of data cutoff with a duration of response of 2.4+ and 7+ months respectively. The third responder had a duration of response of 6.7 
months. The six-month PFS rate for the cohort was 20%. Pharmacodynamic increases in total intratumoral CD8+ cells were seen post-
treatment with INCB001158 + pembrolizumab in MSS CRC patients.

The colorectal carcinoma monotherapy cohort has advanced to stage 2 of a Simon 2-stage design. Among 33 response-evaluable 

MSS CRC patients, one patient achieved a confirmed partial response (3%) and one patient achieved stable disease lasting seven 
months. Both patients had disease progression within six months on their immediately preceding line of therapy. The disease control 
rate for the monotherapy MSS CRC cohort was 27%. INCB001158 inhibited plasma arginase activity at all doses and induced dose-
related increases in plasma arginine, including a mean three-fold increase at the recommended phase 2 dose of 100 mg bid.

The HNSCC cohort of PD-1 naïve patients receiving pembrolizumab and INCB001158 has also advanced to stage 2 of a Simon 

2-stage design and is ongoing.

A total of 85 patients with advanced solid tumors were treated with INCB001158 as a monotherapy in doses of 50 to 150mg bid 
and were evaluable for safety. A maximum tolerated dose was not reached. Immune-related adverse events included one dose-limiting 
toxicity (DLT) each of Grade 2 malaise (at 150mg) and Grade 3 colitis (100mg). Clinically significant urea cycle inhibition was not 
seen. A total of 114 PD-(L)1-naïve and PD-(L)1 refractory patients were treated in INCB001158 in combination with pembrolizumab 
and evaluable for safety across multiple disease specific cohorts. The overall frequency and severity of immune related adverse events 
was consistent with the pembrolizumab safety profile.

A second clinical trial (NCT03314935) designed to evaluate INCB001158 in combination with chemotherapy opened for 
enrollment in November 2017. The Phase 1/2 trial in patients with solid tumors (including metastatic microsatellite stable colorectal 
cancer, biliary tract cancer, gastroesophageal cancer, endometrial cancer or ovarian cancer), is evaluating INCB001158 administered 
orally twice daily with either FOLFOX, gemcitabine/cisplatin or paclitaxel. Primary endpoints include safety and objective response 
rate.

11

Two additional Phase 1/2 trials are ongoing. One is evaluating the safety and anti-tumor activity of INCB001158 in combination 
with daratumumab compared to daratumumab alone in refractory multiple myeloma patients (NCT03837509). The other is evaluating 
the safety and pharmacokinetics of INCB001158 alone and in combination with INCMGA00012, an experimental PD-1 inhibitor 
(NCT03910530).

In January 2017, we entered into a collaboration and license agreement, or the Incyte Collaboration Agreement, with Incyte 
Corporation. Under the terms of the Incyte Collaboration Agreement, we granted Incyte an exclusive, worldwide license to co-develop 
and co-commercialize our small molecule arginase inhibitors for hematology and oncology indications. The parties are collaborating 
on and co-funding the development of the licensed products, with Incyte bearing 70% and us bearing 30% of global development 
costs. The parties will share profits and losses in the U.S., with 60% to Incyte and 40% to us. We will have the right to co-detail the 
licensed products in the U.S., and Incyte will pay us tiered royalties ranging from the low to mid-teens on net sales of licensed 
products outside the U.S. We may opt out of our co-funding obligation, in which case the U.S. profit sharing will no longer be in 
effect, and Incyte will pay us tiered royalties ranging from the low to mid-double digits on net sales of licensed products both in the 
U.S. and outside the U.S., and additional royalties to reimburse us for previously incurred development costs.

In December 2014, we entered into an exclusive license agreement, or the Arginase License Agreement, with Mars, Inc., by and 

through its Mars Symbioscience division, or Symbioscience, under which we have been granted the exclusive, worldwide license 
rights to develop and commercialize Symbioscience’s portfolio of arginase inhibitors for use in human healthcare. Under the Arginase 
License Agreement, we are responsible for the worldwide development and commercialization of the licensed products at our cost, are 
required to use commercially reasonable efforts with respect to such development and commercialization activities, and must meet 
certain general diligence obligations. We hold the first right to prosecute and to enforce all licensed rights under the Arginase License 
Agreement throughout the world, and Symbioscience will retain certain step-in enforcement rights. Under the exclusivity provisions 
of the Arginase License Agreement, each party agrees not to develop any other arginase inhibitors for use in human healthcare outside 
of the scope of the Arginase License Agreement.  

Our Arginase Inhibitor CB-280

Arginase has been proposed to be critical in the pathophysiology of several non-oncology diseases, including cystic fibrosis 
(CF). CF patients have a mutation in the gene that encodes the cystic fibrosis transmembrane-conductance regulator, or CFTR, making 
them particularly susceptible to progressive loss in lung function. Airway disease in CF has a complex pathophysiology and, despite 
recent advances in developing therapies for CF, there still remains an unmet need. CB-280 is a potent and selective oral inhibitor of 
arginase. Arginase plays an important role in the pathophysiology of CF airway disease. Neutrophils accumulate in the lungs of CF 
patients and secrete arginase. Sputum from patients with CF has elevated arginase activity leading to diminished arginine levels. 
Reduced arginine is thought to exacerbate pulmonary disease in CF by impairing production of nitric oxide, leading to a diminished 
anti-microbial immune response and impaired airway function. It is known that airways of patients with CF have lower than normal 
nitric oxide (NO) production, and lower NO levels directly correlate with worsened lung function and increased colonization with 
pathogens, including Pseudomonas aeruginosa. Research in CF patients has demonstrated that increasing arginine levels can increase 
the production of nitric oxide and improve lung function. In addition, published preclinical data also demonstrated that arginine-
dependent NO-based signaling was associated with increased function of the CFTR (Wu et al. Molecular Pharmacology 2019). The 
result was that the use of an arginase inhibitor improved the function of delta 508 mutant CFTR in the presence or absence of a CFTR 
modulator as demonstrated by a change FLIPR fluorescence from baseline.

We, along with our pre-clinical collaborators, have validated arginase inhibitors in mouse models of CF. Based on pre-clinical 
studies in a mouse model of CFTR-mutated CF, we believe that arginase inhibition can lead to reduced infection and improved lung 
function in CF patients and that these data support the clinical development of CB-280 in CF. In February 2019, we initiated a Phase 1 
trial conducted under an IND application. The first-in-human Phase 1 Single Ascending Dose trial, which is now complete, evaluated 
the safety, tolerability and pharmacokinetic profile of oral CB-280 in healthy volunteers. A Phase 1b clinical study in CF patients is 
expected to start enrollment in the first half of 2020, which will test multiple doses of CB-280 compared to placebo in 32 adult CF 
patients to determine a maximum tolerated dose, or MTD, range for CB-280 in CF patients. Patients will receive CB-280 or placebo 
for 14 days; lung function as well as microbes in sputum will be evaluated. A dose-finding expansion of this study is planned in which 
additional cohorts of patients will receive different doses of CB-280 or placebo for 28 days in order to select the optimal dose of CB-
280 to improve lung function. For the entire study, patients will continue their existing therapies for CF (including CFTR modulators). 
Arginase is also thought to play an important pathophysiologic role in several other diseases, including idiopathic pulmonary fibrosis 
and other fibrotic diseases, primary pulmonary hypertension, acute respiratory distress syndrome, and others. Under our collaboration 
agreement with Incyte, we retained the sole right to develop and commercialize CB-280 in specific non-oncology rare disease 
indications, including CF. 

Early Immuno-Oncology Programs

Our research focus has remained on metabolic enzymes. We have two earlier stage immunotherapy programs which include our 

candidate CB-708, which targets CD73, an enzyme in the tumor microenvironment, as well an IL4I1 inhibitor program.

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CD73 is an enzyme that produces adenosine, a powerful inhibitor of immune function in tumors. CD73 is expressed across a 
wide range of tumors and tumor infiltrating leukocytes, and often correlates with poor prognosis. Blockade of adenosine production by 
CD73 inhibition is expected to reverse immunosuppression in the tumor microenvironment and enhance the immune system’s ability 
to fight the cancer. We have developed an orally-bioavailable small molecule inhibitor of CD73, CB-708, that has anti-tumor activity 
in mouse syngeneic models both as monotherapy and in combination with checkpoint inhibitors as well as chemotherapy. Preclinical 
data were presented at the 2019 American Association for Cancer Research annual meeting in April and the Society for 
Immunotherapy of Cancer meeting in November demonstrating that CB-708 is a potent and selective inhibitor of CD73 that has 
immune-mediated, single agent activity in syngeneic mouse tumor models. In pre-clinical studies CB-708 was well-tolerated and 
shows enhanced anti-tumor activity when combined with either an anti-PD-L1 immunotherapy or with chemotherapeutic agents, such 
as oxaliplatin or doxorubicin. Despite the promising preclinical data on CB-708, we have chosen to de-prioritized development of this 
program at this time and we do not have plans to advance the candidate into clinical trials this year.

IL4I1, an enzyme that is primarily expressed by tumor cells and antigen presenting cells, metabolizes phenylalanine to produce 

hydrogen peroxide, an inhibitor of T-cell function. IL4I1 expression has been correlated with poor outcomes in several tumor types, 
has a potential role in immune invasion and may decrease the ability of checkpoint therapy to stimulate an anti-tumor immune 
response. IL4I1 expression is elevated in multiple tumor types with particularly high expression in ovarian and B-cell tumors. We 
have developed an investigational first-in-class, potent, orally available IL4I1 inhibitor. Preclinical data were presented at the SITC 
meeting in November and demonstrated that our novel small-molecule inhibitor of IL4I1 has single-agent anti-tumor activity in 
syngeneic mouse tumor models and augments the activity of checkpoint inhibitors.

Intellectual Property

Our commercial success depends in large part on our ability to obtain and maintain intellectual property protection for our 
product candidates, including telaglenastat, INCB001158, our preclinical compounds, and our core technologies. Our policy is to seek 
to protect our intellectual property position by, among other methods, filing U.S. and foreign patent applications related to the 
technology, inventions and improvements that are important to the development and implementation of our business strategy. We also 
rely on trade secrets, know-how and continuing technological innovation to develop and maintain our proprietary position.

We file patent applications directed to our product candidates, preclinical compounds and related technologies to establish 

intellectual property positions on these compounds and their uses in treating disease. We are seeking patent protection for the use of 
biomarkers to identify patients most likely to benefit from treatment with our product candidates. As of December 31, 2019, we 
owned 15 issued U.S. patents, 25 issued foreign patents, and approximately 285 pending U.S. and foreign patent applications in the 
following foreign jurisdictions: Argentina, Australia, Brazil, Canada, Chile, China, Colombia, Costa Rica, Ecuador, the Eurasian 
Patent Organization, Europe, Hong Kong, Indonesia, India, Israel, Japan, Malaysia, Mexico, New Zealand, Peru, Philippines, Russia, 
Singapore, South Africa, South Korea, Sri Lanka, Taiwan, Thailand, Ukraine, Venezuela, and Vietnam. We expect that these patents 
and patent applications, if issued, would expire between April 2031 and June 2039.

As of December 31, 2019, the intellectual property portfolio for our glutaminase inhibitor program, which includes telaglenastat, 
included nine issued U.S. patents. Four of these U.S. patents expire in 2032 or 2035 and claim compositions of matter for and methods 
of treating cancer with telaglenastat. The other U.S. patents expire between 2035 and 2037, claiming methods of treating cancer with 
telaglenastat. We also have 24 issued foreign patents, eight pending U.S. patent applications and 112 corresponding pending PCT and 
foreign patent applications directed to compositions of matter for telaglenastat and related chemical compounds, as well as methods of 
using these compounds. This portfolio includes one granted U.S. patent and one pending U.S. patent application relating to methods 
for measuring biomarkers in cancer patients to identify patients suitable for treatment with glutaminase inhibitors. We expect that 
these patents and patent applications, if issued, would expire between November 2032 and November 2038.

The intellectual property portfolio for our arginase inhibitor program, which includes INCB001158 and CB-280, includes issued 

patents and pending patent applications that we have exclusively licensed from Symbioscience as well as issued patents and pending 
patent applications that we own. This portfolio includes 12 issued U.S. patents, seven pending U.S. patent applications, 146 
corresponding pending foreign patent applications, and 38 issued foreign patents directed to various arginase inhibitors, therapeutic 
methods of using the compounds, methods of making the compounds, and intermediates useful in preparing the compounds. We 
expect that these patents and patent applications, if issued, would expire between April 2031 and May 2038.

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Manufacturing

We do not own or operate, and currently have no plans to establish, any manufacturing facilities. We currently rely, and expect 

to continue to rely, on third parties to manufacture clinical supplies of telaglenastat, INCB001158, CB-280, and CB-708. Telaglenastat, 
INCB001158, CB-280 and CB-708 are organic compounds of low molecular weight. Our third-party contract manufacturers are 
currently producing telaglenastat, INCB001158, CB-280, and CB-708 for use in our clinical trials utilizing reliable and reproducible 
synthetic processes and common manufacturing techniques. We obtain our supplies from manufacturers on a purchase order basis and 
do not have any long-term arrangements. In addition, we do not currently have arrangements in place for bulk drug substance or drug 
product services of telaglenastat, INCB001158, CB-280 or CB-708. We intend to identify and qualify additional manufacturers to 
provide bulk drug substance and drug product services prior to submission of a new drug application to the FDA if necessary to ensure 
sufficient commercial quantities of telaglenastat, CB-280 and CB-708. Incyte Corporation has assumed responsibility for 
manufacturing of INCB001158 drug substance and drug product.

Research and Development

In the ordinary course of business, we enter into agreements with third parties, such as contract research organizations, medical 

institutions, clinical investigators and contract laboratories, to conduct our clinical trials and aspects of our research and preclinical 
testing. These third parties provide project management and monitoring services and regulatory consulting and investigative services.

Coverage and Reimbursement

Significant uncertainty exists as to the coverage and reimbursement status of any drugs for which we may obtain regulatory 

approval. In the United States and markets in other countries, sales of any drugs for which we receive regulatory approval for 
commercial sale will depend in part on the availability of coverage and reimbursement from third-party payors. Third-party payors 
include government authorities, managed care plans, private health insurers and other organizations. The process for determining 
whether a third-party payor will provide coverage for a drug may be separate from the process for setting the reimbursement rate that 
the payor will pay for the drug. One third-party payor’s decision to cover a particular drug does not ensure that other payors will also 
provide coverage for the drug, or will provide coverage at an adequate reimbursement rate. 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 drug development.

Competition

The pharmaceutical and biotechnology industries are characterized by rapidly advancing technologies, intense competition and a 

strong emphasis on proprietary products. While we believe that our technology, development experience and scientific knowledge 
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 
and new therapies that may become available in the future. 

There are also a number of product candidates in preclinical and clinical development by third parties to treat cancer by 
targeting cellular metabolism. Our principal competitors in the fields of tumor immunology, tumor metabolism, and/or other product 
candidates in development for advanced cancer treatment include Agios Pharmaceuticals, Inc., Arcus Biosciences, Inc., AstraZeneca 
plc, Boehringer Ingelheim GmbH, Bayer Pharma AG, Bristol-Myers Squibb Company, Celgene Corporation, Corvus Pharmaceuticals, 
Inc., Eisai Co., Ltd., Eli Lilly and Company, GlaxoSmithKline plc, Immunomedics Inc., Incyte Corporation, Ipsen, iTeos Therapeutics 
SA, Merck & Co., Merck KGaA, Nektar Therapeutics, Novartis International AG, Pfizer Inc, Roche Holdings AG and its subsidiary 
Genentech, Inc., Takeda Pharmaceutical Co., Ltd., and Xynomic Pharmaceuticals, Inc.

Our primary competitors in the field of Cystic Fibrosis include AbbVie, Inc., AIT Therapeutics, Inc., Corbus Pharmaceuticals, 

Inc., Flatley Discovery Lab, LLC, Galapagos NV, Novartis AG, Novoteris, LLC, Proteostatis Therapeutics, Inc., ProQR Therapeutics 
NV, Translate Bio, Inc., and Vertex Pharmaceuticals, Inc.

The most common methods of treating patients with cancer are surgery, radiation and drug therapy, including chemotherapy, 
hormone therapy, targeted drug therapy, and immunotherapy. There are a variety of available drug therapies marketed for cancer. In 
many cases, these drugs are administered in combination to enhance efficacy. Any product candidates we develop will compete with 
many existing drug and other therapies. To the extent they are ultimately used in combination with or as an adjunct to these therapies, 
our product candidates may not be competitive with them. Some of the currently approved drug therapies are branded and subject to 
patent protection, and others are available on a generic basis. Many of these approved drugs are well established therapies and are 
widely accepted by physicians, patients and third-party payors. In general, although there has been considerable progress over the past 
few decades in the treatment of cancer and the currently marketed therapies provide benefits to many patients, these therapies all are 
limited to some extent in their efficacy and frequency of adverse events, and none are successful in treating all patients. As a result, 
the level of morbidity and mortality from cancer remains high.

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In addition to currently marketed therapies, there are also a number of therapeutics in late stage clinical development to treat 

cancer. These therapeutics in development may provide efficacy, safety, convenience and other benefits that are not provided by 
currently marketed therapies. As a result, they may provide significant competition for any product candidate for which we may obtain 
market approval.

Many of our competitors may have significantly greater financial resources and expertise in research and development, 

manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and marketing approved therapeutics than 
we do. Mergers and acquisitions in the pharmaceutical, biotechnology and diagnostic industries may result in even more resources 
being concentrated among a smaller number of our competitors. 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 necessary for, our programs. Smaller or early stage companies may also prove to be 
significant competitors, particularly through collaborative arrangements with large and established companies.

The key competitive factors affecting the success of telaglenastat, INCB001158, and any future product candidates we develop, 

if approved, are likely to be their efficacy, safety, synergy with other approved therapies, convenience, price and the availability of 
reimbursement from government and other third-party payors.

Our competitors may develop and commercialize therapeutics that are safer, more effective, have fewer or less severe side 
effects, are more convenient or are less expensive than any therapeutics that we may develop. Our competitors also may obtain FDA 
or other regulatory approval for their therapeutics 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 and government programs seeking to control healthcare costs.

Government Regulation

Government authorities in the United States, at the federal, state and local level, and in other countries extensively regulate, 

among other things, the research, development, testing, manufacture, including any manufacturing changes, packaging, storage, 
recordkeeping, labeling, advertising, promotion, distribution, marketing, post-approval monitoring and reporting, import and export of 
pharmaceutical products, such as those we are developing.

United States Drug Approval Process

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and implements 

regulations. The process of obtaining regulatory approvals and the subsequent compliance with appropriate federal, state, local and 
foreign statutes and regulations requires the expenditure of substantial time and financial resources. Failure to comply with the 
applicable United States requirements at any time during the product development process, approval process or after approval, may 
subject an applicant to a variety of administrative or judicial sanctions, such as the FDA’s refusal to approve pending applications, 
withdrawal of an approval, imposition of a clinical hold, issuance of warning letters and untitled letters, product recalls, product 
seizures, total or partial suspension of production or distribution injunctions, fines, refusals of government contracts, restitution, 
disgorgement of profits or civil or criminal penalties.

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

•

•

•

•

•

•

•

•

contract manufacturing expenses, primarily for the production or purchase of clinical supplies;

completion of preclinical laboratory tests, animal studies and formulation studies in compliance with the FDA’s good 
laboratory practice, or GLP, regulations;

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

approval by an independent institutional review board, or IRB, at each clinical site before each trial may be initiated;

performance of adequate and well-controlled human clinical trials in accordance with good clinical practices, or GCP, to 
establish the safety and efficacy of the proposed drug for each indication;

submission to the FDA of a new drug application, or NDA;

satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the product is produced to 
assess compliance with current good manufacturing practices, or cGMP, requirements and to assure that the facilities, 
methods and controls are adequate to preserve the drug’s identity, strength, quality and purity; and

FDA review and approval of the NDA.

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Preclinical Studies and IND

Preclinical studies include laboratory evaluation of product chemistry and formulation, as well as in vitro and animal studies to 

assess the potential for adverse events, and in some cases, to establish a rationale for therapeutic use. The conduct of preclinical 
studies is subject to federal regulations and requirements, including GLP regulations for safety/toxicology studies. An IND sponsor 
must submit the results of the preclinical tests, together with manufacturing information, analytical data, any available clinical data or 
literature and plans for clinical trials, among other things, to the FDA as part of an IND. Some long-term preclinical testing, such as 
animal tests of reproductive adverse events and carcinogenicity, may continue after the IND is submitted. An IND automatically 
becomes effective 30 days after receipt by the FDA, unless before that time, the FDA raises concerns or questions related to one or 
more proposed clinical trials and places the trial on clinical hold. In such a case, the IND sponsor and the FDA must resolve any 
outstanding concerns before the clinical trial can begin. As a result, submission of an IND may not result in the FDA allowing clinical 
trials to commence.

Clinical Trials

Clinical trials involve the administration of the investigational new drug to human subjects under the supervision of qualified 

investigators in accordance with GCP requirements, which include, among other things, the requirement that all research subjects 
provide their informed consent in writing before their participation in any clinical trial. Clinical trials are conducted under written 
study protocols detailing, among other things, the objectives of the study, the parameters to be used in monitoring safety and the 
effectiveness criteria to be evaluated. A protocol for each clinical trial and any subsequent protocol amendments must be submitted to 
the FDA as part of the IND. In addition, an IRB at each institution participating in the clinical trial must review and approve the plan 
for any clinical trial before it commences at that institution, and the IRB must conduct continuing review. The IRB must review and 
approve, among other things, the study protocol and informed consent information to be provided to study subjects. An IRB must 
operate in compliance with FDA regulations. Information about certain clinical trials must be submitted within specific timeframes to 
the National Institutes of Health for public dissemination at www.clinicaltrials.gov. Human clinical trials are typically conducted in 
three sequential phases, which may overlap or be combined:

•

•

•

Phase 1: The drug is initially introduced into healthy human subjects or patients with the target disease or condition and 
tested for safety, dosage tolerance, absorption, metabolism, distribution, excretion and, if possible, to gain an early 
indication of its effectiveness.

Phase 2: The drug is administered to a limited patient population to identify possible adverse effects and safety risks, to 
preliminarily evaluate the efficacy of the product for specific targeted diseases and to determine dosage tolerance and 
optimal dosage.

Phase 3: The drug is administered to an expanded patient population in adequate and well-controlled clinical trials to 
generate sufficient data to statistically confirm the efficacy and safety of the product for approval, to establish the overall 
risk-benefit profile of the product and to provide adequate information for the labeling of the product.

Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and, more frequently, if 

serious adverse events occur. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified 
period, or at all. Furthermore, the FDA or the sponsor may suspend or terminate a clinical trial at any time on various grounds, 
including a finding that the research subjects are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or 
terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s 
requirements or if the drug has been associated with unexpected serious harm to patients.

Marketing Approval

Assuming successful completion of the required clinical testing, the results of the preclinical studies and clinical trials, together 

with detailed information relating to the product’s chemistry, manufacture, controls and proposed labeling, among other things, are 
submitted to the FDA as part of an NDA requesting approval to market the product for one or more indications. Under federal law, the 
submission of most NDAs is additionally subject to a substantial application user fee, and the sponsor of an approved NDA is also 
subject to annual product and establishment user fees, which fees are typically increased annually.

The FDA conducts a preliminary review of all NDAs within the first 60 days after submission before accepting them for filing 
to determine whether they are sufficiently complete to permit substantive review. The FDA may request additional information rather 
than accept an NDA for filing. In this event, the application must be resubmitted with the additional information. The resubmitted 
application is also subject to review before the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins 
an in-depth substantive review. The FDA has agreed to specified performance goals in the review of NDAs. Under these goals, the 
FDA has committed to review most such applications for non-priority products within 10 months, and most applications for priority 
review products, that is, drugs that the FDA determines represent a significant improvement over existing therapy, within six months. 
The review process may be extended by the FDA for three additional months to consider certain information or clarification regarding 
information already provided in the submission. The FDA may also refer applications for novel drugs or 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 recommendations 
of an advisory committee, but it considers such recommendations carefully when making decisions.

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Before approving an NDA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA 

will not approve an application unless it determines that the manufacturing processes and facilities are in compliance with cGMP 
requirements and adequate to assure consistent production of the product within required specifications. In addition, before approving 
an NDA, the FDA will typically inspect one or more clinical sites to assure compliance with GCP and integrity of the clinical data 
submitted.

The testing and approval process requires substantial time, effort and financial resources, and each may take many years to 

complete. Data obtained from clinical activities are not always conclusive and may be susceptible to varying interpretations, which 
could delay, limit or prevent regulatory approval. The FDA may not grant approval on a timely basis, or at all. We may encounter 
difficulties or unanticipated costs in our efforts to develop our product candidates and secure necessary governmental approvals, 
which could delay or preclude us from marketing our products.

After the FDA’s evaluation of the NDA and inspection of the manufacturing facilities, the FDA may issue an approval letter or a 

complete response letter. An approval letter authorizes commercial marketing of the drug with specific prescribing information for 
specific indications. A complete response letter generally outlines the deficiencies in the submission and may require substantial 
additional testing or information in order for the FDA to reconsider the application. If and when those deficiencies have been 
addressed to the FDA’s satisfaction in a resubmission of the NDA, the FDA will issue an approval letter. The FDA has committed to 
reviewing such resubmissions in two or six months depending on the type of information included. Even with submission of this 
additional information, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for approval and 
refuse to approve the NDA. Even if the FDA approves a product, it may limit the approved indications for use for the product, require 
that contraindications, warnings or precautions be included in the product labeling, require that post-approval studies, including phase 
4 clinical trials, be conducted to further assess a drug’s safety after approval, require testing and surveillance programs to monitor the 
product after commercialization, or impose other conditions, including distribution restrictions or other risk management mechanisms, 
including Risk Evaluation and Mitigation Strategies, or REMs, which can materially affect the potential market and profitability of the 
product. The FDA may prevent or limit further marketing of a product based on the results of post-market studies or surveillance 
programs. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes and 
additional labeling claims, are subject to further testing requirements and FDA review and approval.

Fast Track Designation

The FDA is required to facilitate the development and expedite the review of drugs that are intended for the treatment of a 

serious or life-threatening condition for which there is no effective treatment and which demonstrate the potential to address unmet 
medical needs for the condition. Under the Fast Track program, the sponsor of a new product candidate may request the FDA to 
designate the product for a specific indication as a Fast Track product concurrent with or after the submission of the IND for the 
product candidate. The FDA must determine if the product candidate qualifies for Fast Track designation within 60 days after receipt 
of the sponsor’s request.

In addition to other benefits, such as the ability of the sponsor to have more frequent interactions with the FDA, the FDA may 

initiate review of sections of a Fast Track product’s NDA before the application is complete. This rolling review is available if the 
applicant provides and the FDA approves a schedule for the submission of the remaining information and the applicant pays 
applicable user fees. However, the FDA’s time period goal for reviewing a Fast Track application does not begin until the last section 
of the NDA is submitted. In addition, the Fast Track designation may be withdrawn by the FDA if the FDA believes that the 
designation is no longer supported by data emerging in the clinical trial process.

Priority Review

Under FDA policies, a product candidate may be eligible for Priority Review, or review generally within a six-month time 

frame from the time a complete application is accepted for filing. Products regulated by the FDA’s Center for Drug Evaluation and 
Research, or CDER, are eligible for Priority Review if they provide a significant improvement compared to marketed products in the 
treatment, diagnosis or prevention of a disease. A Fast Track designated product candidate would ordinarily meet the FDA’s criteria 
for Priority Review.

Accelerated Approval

Under the FDA’s accelerated approval regulations, the FDA may approve a drug for a serious or life-threatening illness that 

provides meaningful therapeutic benefit to patients over existing treatments based upon a surrogate endpoint that is reasonably likely 
to predict clinical benefit. In clinical trials, a surrogate endpoint is a measurement of laboratory or clinical signs of a disease or 
condition that substitutes for a direct measurement of how a patient feels, functions or survives. Surrogate endpoints can often be 
measured more easily or more rapidly than clinical endpoints. A product candidate approved on this basis is subject to rigorous post-
marketing compliance requirements, including the completion of Phase 4 or post-approval clinical trials to confirm the effect on the 
clinical endpoint. Failure to conduct required post-approval trials, or confirm a clinical benefit during post-marketing studies, would 
allow the FDA to withdraw the drug from the market on an expedited basis. All promotional materials for drug candidates approved 
under accelerated regulations are subject to prior review by the FDA.

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Breakthrough Therapy Designation

A sponsor can request designation of a product candidate as a “breakthrough therapy.” A breakthrough therapy is defined as a 
drug that is intended, alone or in combination with one or more other drugs, to treat a serious or life-threatening disease or condition, 
and preliminary clinical evidence indicates that the product candidate 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 FDA must take certain actions, such as holding timely meetings and providing advice, intended to expedite the development and 
review of an application for approval of a breakthrough therapy. The FDA may later decide that the product candidate no longer meets 
the conditions for breakthrough therapy designation.

Orphan Drugs

Under the Orphan Drug Act, the FDA may grant orphan drug designation to drugs intended to treat a rare disease or condition, 

which is generally defined as a disease or condition that affects fewer than 200,000 individuals in the United States. Orphan drug 
designation must be requested before submitting an NDA. After the FDA grants orphan drug designation, the generic identity of the 
drug and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in, or 
shorten the duration of, the regulatory review and approval process. The first NDA applicant to receive FDA approval for a particular 
active ingredient to treat a particular disease with FDA orphan drug designation is entitled to a seven-year exclusive marketing period 
in the United States for that product, for that indication. During the seven-year exclusivity period, the FDA may not approve any other 
applications to market the same drug for the same orphan indication, except in limited circumstances, such as a showing of clinical 
superiority to the product with orphan drug exclusivity in that it is shown to be safer, more effective or makes a major contribution to 
patient care. Orphan drug exclusivity does not prevent the FDA from approving a different drug for the same disease or condition, or 
the same drug for a different disease or condition. Among the other benefits of orphan drug designation are tax credits for certain 
research and a waiver of the NDA application user fee.

Pediatric Exclusivity and Pediatric Use

Under the Best Pharmaceuticals for Children Act, or BPCA, certain drugs may obtain an additional six months of exclusivity, if 

the sponsor submits information requested in writing by the FDA (a Written Request), relating to the use of the active moiety of the 
drug in children. The FDA may not issue a Written Request for studies on unapproved or approved indications or where it determines 
that information relating to the use of a drug in a pediatric population, or part of the pediatric population, may not produce health 
benefits in that population.

In addition, the Pediatric Research Equity Act, or PREA, requires a sponsor to conduct pediatric studies for most drugs and 

biologics, for a new active ingredient, new indication, new dosage form, new dosing regimen or new route of administration. Under 
PREA, original NDAs, biologics license application and supplements thereto, must contain a pediatric assessment unless the sponsor 
has received a deferral or waiver. Unless otherwise required by regulation, PREA does not apply to any drug for an indication where 
orphan designation has been granted. The required assessment must assess the safety and effectiveness of the product for the claimed 
indications in all relevant pediatric subpopulations and support dosing and administration for each pediatric subpopulation for which 
the product is safe and effective. The sponsor or FDA may request a deferral of pediatric studies for some or all of the pediatric 
subpopulations. A deferral may be granted for several reasons, including a finding that the drug or biologic is ready for approval for 
use in adults before pediatric studies are complete or that additional safety or effectiveness data needs to be collected before the 
pediatric studies begin. The FDA must send a non-compliance letter to any sponsor that fails to submit the required assessment, keep a 
deferral current or fails to submit a request for approval of a pediatric formulation.

Overview of FDA Regulation of Companion Diagnostics

We may seek to develop in vitro companion diagnostics for use in selecting the patients that we believe will respond to our 

therapeutics. In August 2014, the FDA issued a guidance document that states that if safe and effective use of a therapeutic product 
depends on an in vitro diagnostic, then the FDA generally will require approval or clearance of the diagnostic at the same time that the 
FDA approves the therapeutic product. The guidance addresses issues critical to developing and obtaining approval or clearance for 
companion diagnostics and provides guidance as to when the FDA will require that the in vitro diagnostic, which is regulated as a 
medical device, and the drug be approved simultaneously. The FDA requires in vitro companion diagnostics intended to select the 
patients who will respond to cancer treatment to obtain approval simultaneously with approval of the drug.

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Other Regulatory Requirements

Any drug 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 recordkeeping, periodic reporting, product sampling and distribution, 
advertising and promotion and reporting of adverse experiences with the product. After approval, most changes to the approved 
product, such as adding new indications or other labeling claims are subject to prior FDA review and approval.

The FDA may impose a number of post-approval requirements, including REMs, as a condition of approval of an NDA. For 

example, the FDA may require post-marketing testing, including phase four clinical trials, and surveillance to further assess and 
monitor the product’s safety and effectiveness after commercialization. Regulatory approval of oncology products often requires that 
patients in clinical trials be followed for long periods to determine the overall survival benefit of the drug.

In addition, drug manufacturers and other entities involved in the manufacture and distribution of approved drugs are required to 

register their establishments with the FDA and state agencies, and are subject to periodic unannounced inspections by the FDA and 
these state agencies for compliance with cGMP requirements. Changes to the manufacturing process are strictly regulated and often 
require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations 
from cGMP and impose reporting and documentation 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 areas of production and quality control to 
maintain cGMP compliance.

Once an approval is granted, the FDA may withdraw the 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 trials to assess new safety risks or imposition of distribution or other restrictions under a Risk Evaluation and 
Mitigation Strategy program. Other potential consequences include, among other things:

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•

•

•

•

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

fines, warning letters or holds on post-approval clinical trials;

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; or

consent decrees, injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates marketing, labeling, advertising and promotion of products that are placed on the market. Drugs may 

be promoted only for the approved indications 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, and a company that is found to have 
improperly promoted off label uses may be subject to significant liability.

Additional Provisions

In addition to FDA restrictions on marketing of pharmaceutical products, several other types of state and federal laws have been 

applied to restrict certain marketing practices in the pharmaceutical industry in recent years. These laws include, among others, anti-
kickback statutes and false claims statutes. The federal healthcare program 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. This statute has been interpreted to apply to arrangements between pharmaceutical 
manufacturers on the one hand and prescribers, purchasers and formulary managers on the other. 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.

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Federal false claims laws prohibit any person from knowingly presenting, or causing to be presented, a false claim for payment 
to the federal government, or knowingly making, or causing to be made, a false statement to have a false claim paid. Recently, several 
pharmaceutical and other healthcare companies have been prosecuted under these laws for allegedly inflating drug prices they report 
to pricing services, which in turn were used by the government to set Medicare and Medicaid reimbursement rates, and for allegedly 
providing free product to customers with the expectation that the customers would bill federal programs for the product. In addition, 
certain marketing practices, including off-label promotion, may also violate false claims laws. Violations of the anti-kickback statute 
and false claims laws are punishable by imprisonment, criminal fines, civil monetary penalties, possible exclusion from participation 
in federal healthcare programs and integrity oversight and reporting obligations to resolve allegations of non-compliance with this law. 
The majority of states also have statutes or regulations similar to the federal anti-kickback law and false claims laws, which apply to 
items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor.

We may also be subject to additional federal and state laws related to physician transparency, data privacy and security, and 
pharmaceutical manufacturer compliance guidelines, including the federal Health Insurance Portability and Accountability Act of 
1996 and the Physician Payments Sunshine Act.

If our operations are found to be in violation of any of the laws described above or any other government regulations that apply 

to us, we may be subject to penalties, including significant administrative, civil and criminal penalties, damages, fines, additional 
reporting requirements and oversight if we become subject to a corporate integrity agreement or similar agreement to resolve 
allegations of noncompliance with these laws, exclusion from participation in government health care programs, such as Medicare and 
Medicaid, disgorgement, imprisonment, contractual damages, reputational harm and the curtailment or restructuring of our operations, 
any of which could harm our ability to operate our business and our results of operations.

Foreign Regulation

In order to market any product outside of the United States, we would need to comply with numerous and varying regulatory 

requirements of other countries regarding safety and efficacy and governing, among other things, clinical trials, marketing 
authorization, commercial sales and distribution of our products. Whether or not we obtain FDA approval for a product, we would 
need to obtain the necessary approvals by the comparable regulatory authorities of foreign countries before we can commence clinical 
trials or marketing of the product in those countries. The approval process varies from country to country and can involve additional 
product testing and additional administrative review periods. The time required to obtain approval in other countries might differ from 
and be longer than that required to obtain FDA approval. Regulatory approval in one country does not ensure regulatory approval in 
another, but a failure or delay in obtaining regulatory approval in one country may negatively impact the regulatory process in others.

New Legislation and Regulations

From time to time, legislation is drafted, introduced and passed in Congress that could significantly change the statutory 
provisions governing the testing, approval, manufacturing and marketing of products regulated by the FDA. In addition to new 
legislation, FDA regulations and policies are often revised or interpreted by the agency in ways that may significantly affect our 
business and our products. It is impossible to predict whether further legislative changes will be enacted or whether FDA regulations, 
guidance, policies or interpretations changed or what the effect of such changes, if any, may be.

Employees

As of December 31, 2019, we had 93 employees, 90 of which were full-time employees, including 29 employees with Ph.D. or 

M.D. degrees. Of these full-time employees, 65 employees are engaged in research and development activities. None of our 
employees are represented by a labor union or covered by a collective bargaining agreement.

Facilities 

We occupy approximately 54,000 square feet of office and laboratory space in South San Francisco, California. Our lease term 
is through January 2024, with an option to extend another two years to January 2026. Approximately 21,000 square feet of laboratory 
space was leased to another biotechnology company under a sublease agreement that expired in February 2020. We believe that our 
facility is sufficient to meet our current needs and that suitable additional space will be available as and when needed.

Legal Proceedings

From time to time, we may become involved in litigation relating to claims arising from the ordinary course of business. Our 
management believes that there are currently no claims or actions pending against us, the ultimate disposition of which could have a 
material adverse effect on our results of operations, financial condition or cash flows.

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Available Information

We were incorporated in the State of Delaware on March 9, 2010. Our website address is www.calithera.com. Information 

found on, or accessible through, our website is not a part of, and is not incorporated into, this Annual Report on Form 10-K.

We file electronically with the U.S. Securities and Exchange Commission, or SEC, our annual reports on Form 10-K, quarterly 
reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 
15(d) of the Securities Exchange Act of 1934, as amended. We make available on our website at www.calithera.com, free of charge, 
copies of these reports as soon as reasonably practicable after filing these reports with, or furnishing them to, the SEC.

Item 1A.

Risk Factors.

Our business involves significant risks, some of which are described below. You should carefully consider these risks, in 
addition to the other information contained in this Annual Report on Form 10-K, including our consolidated financial statements and 
related notes and the section of this report titled “Management’s Discussion and Analysis of Financial Condition and Results of 
Operations.” The occurrence of any of the events or developments described in the following risk factors and the risks described 
elsewhere in this report could harm our business, financial condition, results of operations, cash flows, the trading price of our 
common stock and our growth prospects. Additional risks and uncertainties not presently known to us or that we currently deem 
immaterial may also impair our business operations. This report on Form 10-K also contains forward-looking statements that involve 
risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements as a result 
of factors that are described in the following risk factors and the risks described elsewhere in this report. 

Risks Related to Our Financial Position and Need For Additional Capital

We have incurred significant operating losses since our inception and anticipate that we will continue to incur substantial 
operating losses for the foreseeable future. We may never achieve or maintain profitability.

Since our inception, we have incurred significant operating losses. Our net loss was $89.9 million, $54.6 million, and $27.8 
million for year ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, we had an accumulated deficit of 
$286.1 million. To date, we have financed our operations through sales of our capital stock and payments from the Incyte 
Collaboration Agreement. We have devoted substantially all of our financial resources and efforts to research and development. We 
expect that it may be a couple of years, if ever, before we receive regulatory approval and have a product candidate ready for 
commercialization. We expect to continue to incur significant expenses and increasing operating losses for the foreseeable future. Our 
net losses may fluctuate significantly from quarter to quarter and year to year. We anticipate that our expenses will increase 
substantially if and as we:

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advance further into clinical trials for our existing clinical product candidates, telaglenastat, INCB001158, and CB-280;

continue the preclinical development of our research programs and advance candidates into clinical trials;

identify additional product candidates and advance them into preclinical development;

pursue regulatory approval of product candidates;

seek marketing approvals for our product candidates that successfully complete clinical trials;

establish a sales, marketing and distribution infrastructure to commercialize any product candidates for which we obtain 
marketing approval;

maintain, expand and protect our intellectual property portfolio;

hire additional clinical, commercial, regulatory and scientific personnel;

add operational, financial and management information systems and personnel, including personnel to support product 
development and commercialization; 

acquire or in-license other product candidates and technologies; and

operate as a public company.

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We have never generated any revenue from product sales and may never be profitable. To become and remain profitable, we 

and/or our collaborators must develop and eventually commercialize one or more products with significant market potential. This will 
require us to be successful in a range of challenging activities, including completing preclinical studies and clinical trials of our 
product candidates, obtaining marketing approval for these product candidates, manufacturing, marketing and selling those product 
candidates for which we may obtain marketing approval, and satisfying any post-marketing requirements. We may never succeed in 
these activities and, even if we do, may never generate revenue that is significant or large enough to achieve profitability. Our failure 
to become and remain profitable would decrease the value of the company and could impair our ability to raise capital, maintain our 
research and development efforts, expand our business or continue our operations. A decline in the value of our company could also 
cause you to lose all or part of your investment.

We will need substantial additional funding. If we are unable to raise capital when needed, we would be forced to delay, reduce or 
eliminate our product development programs or commercialization efforts.

We expect our expenses to increase in connection with our ongoing activities, particularly as we continue the research and 
development of, continue and initiate clinical trials of, potentially prepare for commercial launch of, and seek marketing approval for 
our product candidates, specifically telaglenastat and INCB001158, and as we become obligated to make milestone payments pursuant 
to our outstanding license agreement. In addition, if we obtain marketing approval for any of our product candidates, we expect to 
incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution of the approved 
product. 

Our future capital requirements will depend on many factors, including:

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the scope, progress, results and costs of drug discovery, clinical development, laboratory testing and clinical trials for our 
product candidates, in particular telaglenastat, and INCB001158 and CB-280;

the costs, timing and outcome of any regulatory review of our product candidates, telaglenastat, INCB001158, and CB-
280;

the cost of any other product programs we pursue;

the costs and timing of commercialization activities, including manufacturing, marketing, sales and distribution, for any 
product candidates that receive, or that we anticipate may 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;

achieving the milestones set forth in the Incyte Collaboration Agreement;

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

the extent to which we acquire or in-license other product candidates and technologies.

Identifying potential product candidates and conducting preclinical studies and clinical trials are time consuming, expensive and 
uncertain processes that take years to complete, and we may never generate the necessary data or results required to obtain marketing 
approval and achieve product sales for any of our current or future product candidates. In addition, our product candidates, if approved, 
may not achieve commercial success. Our commercial revenue, if any, will be derived from sales of products that may not be 
commercially available for many years, if at all.

We do not have any material committed external source of funds or other support for our development efforts other than the 

Incyte Collaboration Agreement for the development and commercialization of small molecule arginase inhibitors in hematology and 
oncology indications, including INCB001158, which agreement is terminable by Incyte for convenience or following our uncured 
breach. If Incyte terminates our collaboration agreement, we would need to obtain substantial additional sources of funding to develop 
INCB001158 as currently contemplated. If such additional funding is not available on favorable terms or at all, we may need to delay 
or reduce the scope of our INCB001158 development program or dedicate resources allocated to other programs to fund INCB001158. 
We may also need to grant rights in the United States, as well as outside the United States, to INCB001158 to one or more partners.

Accordingly, we will need substantial additional funding in connection with our continuing operations and to achieve our goals. 

We expect that our existing cash, cash equivalents, and investments will be sufficient to enable us to meet our current operating plan 
for at least the next 12 months. However, our existing cash, cash equivalents and investments may prove to be insufficient for these 
activities. If we are unable to raise capital when needed or on attractive terms, we would be forced to delay, reduce or eliminate our 
research and development programs or future commercialization efforts. Adequate additional financing may not be available to us on 
acceptable terms, or at all. In addition, we may seek additional financing due to favorable market conditions or strategic considerations, 
even if we believe we have sufficient funds for our operating plans.

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

Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a 

combination of equity and debt financings, as well as entering into new collaborations, strategic alliances and licensing arrangements. 
We do not have any committed external source of funds, other than our collaborations, which are limited in scope and duration. To the 
extent that we raise additional capital through the sale of equity or convertible debt securities, your ownership interest will be diluted, 
and the terms of these securities may include liquidation or other preferences that adversely affect your rights as a common 
stockholder. Debt financing, if available, may involve agreements that include covenants limiting or restricting our ability to take 
specific actions, such as incurring additional debt, making capital expenditures or declaring dividends, and may be secured by all or a 
portion of our assets. If we raise funds by entering into new collaborations, strategic alliances or licensing arrangements in the future 
with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product 
candidates or to grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or 
debt financings or through collaborations, strategic alliances or licensing arrangements when needed, we may be required to delay, 
limit, reduce or terminate our product development or future commercialization efforts or grant rights to develop and market product 
candidates that we would otherwise prefer to develop and market ourselves.

Our short operating history may make it difficult for you to evaluate the success of our business to date and to assess our future 
viability.

We were founded in March 2010 and our operations to date have been limited to organizing and staffing our company, business 

planning, raising capital, developing our technology, identifying potential product candidates, undertaking preclinical studies and 
commencing Phase 1 and 2 clinical trials of our product candidates. CB-280, INCB001158, and telaglenastat are currently being 
evaluated in Phase 1, Phase 1/2, and Phase 2 clinical trials, respectively. All of our other programs are in research and preclinical 
development. We have not yet demonstrated our ability to successfully complete any clinical trials, including large-scale, pivotal 
clinical trials required for regulatory approval of our product candidates, obtain marketing approvals, manufacture a commercial scale 
product, or arrange for a third party to do so on our behalf, or conduct sales and marketing activities necessary for successful 
commercialization. Typically, it takes many years to develop one new product from the time it is discovered to when it is 
commercially available. Consequently, any predictions made about our future success or viability may not be as accurate as they could 
be if we had a longer operating history or if we had product candidates in advanced clinical trials.

In addition, we may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors 
that may alter or delay our plans. We will need to continue to transition from a company with a research focus to a company capable 
of supporting development activities and, if a product candidate is approved, a company capable of supporting successful commercial 
activities. We may not be successful in any step in such a transition.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

Sections 382 and 383 place a limitation on the amount of taxable income which can be offset by carryforward tax attributes, 
such as net operating losses or tax credits, after a change in control. Generally, after a change in control, a loss corporation cannot 
deduct carryforward tax attributes in excess of the limitation prescribed by Section 382 and 383. Therefore, certain of the Company's 
carryforward tax attributes may be subject to an annual limitation regarding their utilization against taxable income in future periods. 
As a result of the Company's IPO in 2014, the Company triggered an "ownership change" as defined in Internal Revenue Code Section 
382 and related provisions. Additionally, due to stock acquired by investors and reported under Section 13(g), the Company believes 
that an “ownership change” occurred during 2018, as well. Subsequent ownership changes since 2018 may subject the Company to 
annual limitations of its net operating loss and credit carryforwards. Such annual limitation could result in the expiration of the net 
operating loss and credit carryforwards before utilization.

Furthermore, our ability to use our net operating losses and other tax attributes to offset potential future taxable income and 
related income taxes that would otherwise be due is dependent upon our generation of future taxable income before the expiration 
dates of the net operating losses, and we cannot predict with certainty when, or whether, we will generate sufficient taxable income to 
use all of our net operating losses. Federal net operating losses generated prior to 2018 will continue to be governed by the net 
operating loss tax rules as they existed prior to the adoption of the new Tax Cuts and Jobs Act of 2017, or Tax Act, which means that 
generally they will expire 20 years after they were generated if not used prior thereto. Many states have similar laws. Accordingly, our 
federal and state net operating losses could expire unused and be unavailable to offset future income tax liabilities. Under the newly 
enacted Tax Act, federal net operating losses incurred in 2018 and in future years may be carried forward indefinitely, but the 
deductibility of such federal net operating losses is limited to 80% of current year taxable income.

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Our effective tax rate may fluctuate, and tax authorities may disagree with our positions and conclusions regarding certain tax 
positions, resulting in unanticipated costs, taxes or non-realization of expected benefits. 

Our effective tax rate may be different than experienced in the past due to numerous factors, including passage of the newly 

enacted federal income tax law, changes in the mix of our profitability between jurisdictions in which we are or may become subject 
to tax, the results of examinations and audits of our tax filings, our inability to secure or sustain acceptable agreements with tax 
authorities, changes in accounting for income taxes and changes in tax laws. Any of these factors could cause us to experience an 
effective tax rate significantly different from previous periods or our current expectations and may result in tax obligations in excess 
of amounts accrued in our financial statements.

A tax authority may disagree with tax positions that we have taken, which could result in increased tax liabilities. For example, a 

tax authority could assert that we are subject to tax in a jurisdiction where we believe we have not established a taxable nexus, often 
referred to as a “permanent establishment” under international tax treaties, and such an assertion, if successful, could increase our 
expected tax liability in one or more jurisdictions. A tax authority may take the position that material income tax liabilities, interest 
and penalties are payable by us, in which case, we expect that we might contest such assessment. Contesting such an assessment may 
be lengthy and costly and if we were unsuccessful in disputing the assessment, the implications could increase our anticipated 
effective tax rate, where applicable.

Risks Related to Drug Discovery, Development and Commercialization

Our approach to the discovery and development of product candidates that target tumor metabolism and tumor immunology is 
unproven and may never lead to marketable products.

Our scientific approach focuses on using our understanding of cellular metabolic pathways and the role of glutaminase in these 

pathways, as well as the role of arginase in the anti-tumor immune response, to identify molecules that are potentially promising as 
therapies for cancer indications. Any product candidates we develop may not effectively modulate metabolic or immunology 
pathways. The scientific evidence to support the feasibility of developing product candidates based on inhibiting tumor metabolism or 
impacting the anti-tumor immune response are both preliminary and limited. Although preclinical studies suggest that inhibiting 
glutaminase can suppress the growth of certain cancer cells, to date no company has translated this mechanism into a drug that has 
received marketing approval. Even if we are able to develop a product candidate in preclinical studies, we may not succeed in 
demonstrating the safety and efficacy of the product candidate in human clinical trials. Our expertise in cellular metabolic pathways, 
the role of glutaminase in these pathways, and the role of arginase in the anti-tumor immune response may not result in the discovery 
and development of commercially viable products to treat cancer.

Our drug discovery and development efforts might not generate successful product candidates.

We have invested a significant portion of our efforts and financial resources in the identification of our most advanced product 

candidates, telaglenastat, INCB001158 and CB-280, which are being evaluated in Phase 2, Phase 1/2 and Phase 1 clinical trials, 
respectively. Although we believe the Phase 2 CANTATA trial, if it meets its primary endpoint, may be sufficient to support approval 
of a New Drug Application by FDA, the FDA may disagree and we may be required to conduct additional trials to support the 
approval of telaglenastat in combination for the second or third line treatment of renal cell carcinoma. We have entered into the Incyte 
Collaboration Agreement for the development and commercialization of INCB001158. Pursuant to our agreement, we collaborate on 
and co-fund the development of INCB001158 for hematology and oncology indications, and, unless we opt out of our co-funding 
obligation, Incyte will fund 70% of global development costs and we will be responsible for the remaining 30%. All of our other 
programs are in research and preclinical development. Telaglenastat and INCB001158 will be developed for use in combination with 
other approved therapies, and as such, we will be dependent upon the continued marketing availability of the drugs that are used in 
combination with them. As a result, the timing and costs of the regulatory paths we will follow and marketing approvals remain 
uncertain. Our ability to generate product revenue, which may not occur for many years, if ever, will depend heavily on the successful 
development and eventual commercialization of telaglenastat and INCB001158. The success of telaglenastat, INCB001158 and any 
other product candidates we may develop will depend on many factors, including the following:

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successful enrollment in, and completion of, clinical trials;

demonstrating safety and efficacy;

receipt of marketing approvals from applicable regulatory authorities;

establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers;

obtaining and maintaining patent and trade secret protection and non-patent exclusivity for our product candidates;

developing a sales and marketing organization or outsourcing these functions to third parties;

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launching commercial sales of the product candidates, if and when approved, whether alone or selectively in collaboration 
with others;

our ability to successfully develop and commercialize small molecule arginase inhibitors, including INCB001158 with 
Incyte;

acceptance of the product candidates, if and when approved, by patients, the medical community and third-party payors;

effectively competing with other therapies;

a continued acceptable safety profile of the products following approval; 

enforcing and defending intellectual property rights and claims; and

other legal, regulatory, compliance, privacy, and fraud and abuse matters.

If we do not accomplish one or more of these goals in a timely manner, or at all, we could experience significant delays or an 

inability to successfully commercialize our product candidates, which would harm our business.

We may not be successful in our efforts to identify or discover potential product candidates for clinical development.

Our drug discovery efforts may not be successful in identifying compounds that are useful in treating cancer. Our research 
programs may initially show promise in identifying potential product candidates, yet fail to yield product candidates for clinical 
development for a number of reasons. In particular, our research methodology used may not be successful in identifying compounds 
with sufficient potency or bioavailability to be potential product candidates. In addition, our potential product candidates may, on 
further study, be shown to have harmful side effects or other negative characteristics.

Research programs to identify new product candidates require substantial technical, financial and human resources. We may 

choose to focus our efforts and resources on potential product candidates that ultimately prove to be unsuccessful. If we are unable to 
identify suitable compounds for preclinical and clinical development, we will not be able to generate product revenue, which would 
harm our financial position and adversely impact our stock price.

If clinical trials of our product candidates fail to demonstrate safety and efficacy to the satisfaction of regulatory authorities 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 our product candidates.

Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must complete 
preclinical development and in the case of INCB001158, together with Incyte, then conduct extensive clinical trials to demonstrate the 
safety and efficacy of our product candidates in humans. Clinical testing is expensive, difficult to design and implement, can take 
many years to complete and is uncertain as to outcome. A failure of one or more clinical trials could occur at any stage of testing. The 
outcome of preclinical testing and early clinical trials may not be predictive of the success of later clinical trials, and interim results of 
a particular clinical trial do not necessarily predict final results of that trial.

Moreover, preclinical and clinical data are often susceptible to multiple interpretations and analyses. 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.

We may experience numerous unforeseen events during, or as a result of, preclinical testing or clinical trials that could delay or 

prevent our ability to receive marketing approval or commercialize our product candidates, including that:

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regulators or institutional review boards may not authorize us or our investigators to commence a clinical trial or conduct 
a clinical trial at a prospective trial site;

we may have delays in reaching or fail to reach agreement on acceptable clinical trial contracts or clinical trial protocols 
with prospective trial sites;

clinical trials of our product candidates may produce negative or inconclusive results, and we may decide, or regulators 
may require us, to conduct additional clinical trials or abandon product development programs;

the number of patients required for clinical trials of our product candidates may be larger than we anticipate; enrollment in 
these clinical trials may be slower than we anticipate, or participants may drop out of these clinical trials at a higher rate 
than we anticipate;

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

regulators or institutional review boards may require that we or our investigators suspend or terminate clinical research for 
various reasons, including noncompliance with regulatory requirements or a finding that the participants are being 
exposed to unacceptable health risks;

the cost of clinical trials of our product candidates may be greater than we anticipate; and

the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product 
candidates may be insufficient or inadequate.

If we are required to conduct additional clinical trials or other testing of our product candidates beyond those that we currently 
contemplate, if we are unable to successfully complete clinical trials of our product candidates or other testing, if the results of these 
trials or tests are not positive or are only modestly positive or if there are safety concerns, we may:

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be delayed in obtaining marketing approval for our product candidates;

not obtain marketing approval at all;

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 in receiving marketing approvals. We do not 

know whether any clinical trials will begin as planned, will need to be restructured or will be completed on schedule, or at all. 
Significant clinical trial delays also could shorten any periods during which we may have the exclusive right to commercialize our 
product candidates, could allow our competitors to bring products to market before we do, and could impair our ability to successfully 
commercialize our product candidates, any of which may harm our business and results of operations.

If we experience delays or difficulties in enrolling patients in clinical trials, our receipt of necessary regulatory approvals could be 
delayed or prevented.

We may not be able to initiate or continue clinical trials for our product candidates if we are unable to identify and enroll a 
sufficient number of eligible patients to participate in these trials as required by the U.S. Food and Drug Administration, or the FDA, 
or analogous regulatory authorities outside the United States. In addition, some of our competitors may have ongoing clinical trials for 
product candidates that would treat the same indications as our product candidates, and patients who would otherwise be eligible for 
our clinical trials may instead enroll in clinical trials of our competitors’ product candidates. Patient enrollment is also affected by 
other factors, including:

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severity of the disease under investigation;

availability and efficacy of approved medications for the disease under investigation;

eligibility criteria for the trial in question;

perceived risks and benefits of the product candidate under study;

efforts to facilitate timely enrollment in clinical trials;

patient referral practices of health care professionals;

the ability to monitor patients adequately during and after treatment; and

proximity and availability of clinical trial sites for prospective patients.

Our inability to enroll a sufficient number of patients for our clinical trials would result in significant delays or may require us to 

abandon one or more clinical trials altogether. Enrollment delays in our clinical trials may result in increased development costs for 
our product candidates, which would cause the value of our company to decline and limit our ability to obtain additional financing.

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If serious adverse effects or unexpected characteristics of our product candidates are identified during development, we may need 
to abandon or limit our development of some or all of our product candidates.

We are currently evaluating CB-280, INCB001158, and telaglenastat in Phase 1, Phase 1/2, and Phase 2 clinical trials, 
respectively. All our other programs are in research and preclinical development and their risk of failure is high. It is impossible to 
predict when or if any of our product candidates will prove effective or safe in humans or will receive marketing approval. Adverse 
events or undesirable side effects caused by, or other unexpected properties of, our product candidates could cause us, any current or 
future collaborators, an institutional review board or regulatory authorities to interrupt, delay or halt clinical trials of one or more of 
our product candidates and could result in a more restrictive label, or the delay or denial of marketing approval by the FDA or 
comparable foreign regulatory authorities. If adverse effects were to arise in patients being treated with any of our product candidates, 
it could require us to halt, delay or interrupt clinical trials of such product candidate or adversely affect our ability to obtain requisite 
approvals to advance the development and commercialization of such product candidate. If our product candidates are associated with 
undesirable side effects or have characteristics that are unexpected, we may need to abandon their development or limit development 
to certain uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more 
acceptable from a risk-benefit perspective. Many agents that initially showed promise in early stage testing for treating cancer or other 
diseases have later been found to cause side effects that prevented further development of the agent.

We are in early clinical trials with telaglenastat and INCB001158 and we have seen several adverse events, or AEs, deemed 

possibly or probably related to study drug in each of those programs. For example, in our evaluation of telaglenastat with nivolumab, 
during the dose escalation of the combination therapy, there was one report of dose limiting Grade 3 ALT increase. We have treated 
an insufficient number of patients to fully assess the safety of telaglenastat and INCB001158 and, as these trials progress, we may 
experience frequent or severe adverse events. Our ongoing and planned trials for telaglenastat and our and Incyte’s ongoing and 
planned trials for INCB001158 may fail due to safety issues, and we may need to abandon development of telaglenastat or 
INCB001158. Our other research programs may fail due to preclinical or clinical safety issues, causing us to abandon or delay the 
development of a product candidate from these programs.

Results of preclinical studies and early clinical trials may not be predictive of results of future clinical trials.

The outcome of preclinical studies and early clinical trials may not be predictive of the success of later clinical trials, and 
interim results of clinical trials do not necessarily predict success in future clinical trials. Many companies in the pharmaceutical and 
biotechnology industries have suffered significant setbacks in late-stage clinical trials after achieving positive results in earlier 
development, and we could face similar setbacks. The design of a clinical trial can determine whether its results will support approval 
of a product and flaws in the design of a clinical trial may not become apparent until the clinical trial is well advanced. We may 
experience delays in designing and executing clinical trials to support marketing approval. In addition, preclinical and clinical data are 
often susceptible to varying interpretations and analyses. Many companies that believed their product candidates performed 
satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval for the product candidates. 
Even if we, or our current and future collaborators, believe that the results of clinical trials for our product candidates warrant 
marketing approval, the FDA or comparable foreign regulatory authorities may disagree and may not grant marketing approval of our 
product candidates.

In some instances, there can be significant variability in safety or efficacy results between different clinical trials of the same 

product candidate due to numerous factors, including changes in trial procedures set forth in protocols, differences in the size and type 
of the patient populations, changes in and adherence to the dosing regimen and other clinical trial protocols and the rate of dropout 
among clinical trial participants. If we fail to receive positive results in clinical trials of our product candidates, the development 
timeline and regulatory approval and commercialization prospects for our most advanced product candidates, and, correspondingly, 
our business and financial prospects would be negatively impacted. 

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product 
candidates or indications that may be more profitable or for which there is a greater likelihood of success.

We have limited financial and managerial resources. As a result, we may forego or delay pursuit of opportunities with other 
product candidates or for other indications 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 
products. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may 
relinquish valuable rights to that product candidate through collaboration, licensing or other royalty arrangements, including our 
agreement with Incyte, in cases in which it would have been more advantageous for us to retain sole development and 
commercialization rights to such product candidate. In addition, under our agreement with Incyte, Incyte has the right to 
commercialize INCB001158 in hematology and oncology indications. If Incyte does not successfully commercialize INCB001158, we 
may be unable to realize the full value from our collaboration with Incyte.

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Even if any of our product candidates receives marketing approval, we or others may later discover that the product is less effective 
than previously believed or causes undesirable side effects that were not previously identified, which could compromise our ability, 
or that of any future collaborators, to market the product.

Clinical trials of our product candidates are conducted in carefully defined sets of patients who have agreed to enter into clinical 

trials. Consequently, it is possible that our clinical trials, or those of any future collaborator, may indicate an apparent positive effect 
of a product candidate that is greater than the actual positive effect, if any, or alternatively fail to identify undesirable side effects. If, 
following approval of a product candidate, we, or others, discover that the product is less effective than previously believed or causes 
undesirable side effects that were not previously identified, any of the following adverse events could occur:

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regulatory authorities may withdraw their approval of the product or seize the product;

we, or any future collaborators, may be required to recall the product, change the way the product is administered or 
conduct additional clinical trials;

additional restrictions may be imposed on the marketing of, or the manufacturing processes for, the particular product;

regulatory authorities may require the addition of labeling statements, such as a “black box” warning or a contraindication;

we, or any future collaborators, may be required to create a Medication Guide outlining the risks of the previously 
unidentified side effects for distribution to patients;

we, or any future collaborators, could be sued and held liable for harm caused to patients;

the product may become less competitive; and

our reputation may suffer.

Even if any of our product candidates receive marketing approval, they may fail to achieve the degree of market acceptance by 
health care professionals, patients, third party payors and others in the medical community necessary for commercial success.

If any of our product candidates receive marketing approval, they may nonetheless fail to gain sufficient market acceptance by 
health care professionals, patients, third party payors and others in the medical community for us to achieve commercial success. For 
example, current cancer treatments like chemotherapy and radiation therapy for certain diseases and conditions are well established in 
the medical community, and doctors may continue to rely on these treatments. If our product candidates do not achieve an adequate 
level of acceptance, we may not generate significant product revenue to become profitable. The degree of market acceptance of our 
product candidates, if approved for commercial sale, will depend on a number of factors, including:

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the efficacy and potential advantages compared to alternative treatments;

our ability to offer any approved products for sale at competitive prices;

convenience and ease of administration compared to alternative treatments;

the willingness of the target patient population to try new therapies and of health care professionals to prescribe these 
therapies;

the strength of marketing and distribution support;

third-party coverage and sufficient reimbursement; and

the prevalence and severity of any side effects.

If, in the future, we are unable to establish adequate sales and marketing capabilities or to selectively enter into agreements with 
third parties to sell and market our product candidates, we may not be successful in commercializing our product candidates if and 
when they are approved.

We do not have a sales or marketing infrastructure and have no experience in the sale, marketing or distribution of 

pharmaceutical products. To achieve commercial success for any approved product for which we retain sales and marketing 
responsibilities, we must either develop a robust sales and marketing organization or outsource these functions to other third parties. 
For our small molecule arginase inhibitors in hematology and oncology indications, including INCB001158, unless we establish our 
own sales and marketing capabilities, we will be significantly dependent on Incyte’s sales and marketing infrastructure to effectively 
commercialize these products. In the future, we may choose to build a focused sales and marketing infrastructure to sell some of our 
product candidates, if and when they are approved.

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There are risks involved both with establishing our own sales and marketing capabilities and with entering into arrangements 
with third parties to perform these services. For example, recruiting and training a sales force is expensive and time consuming and 
could delay any product launch. If the commercial launch of a product candidate for which we recruit a sales force and establish 
marketing capabilities is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these 
commercialization expenses. This may be costly, and our investment would be lost if we cannot retain or reposition our sales and 
marketing personnel.

Factors that may inhibit our efforts to commercialize our product candidates on our own include:

•

•

•

our inability to recruit and retain adequate numbers of effective sales and marketing personnel;

the inability of sales personnel to obtain access to health care professionals or persuade adequate numbers of health care 
professionals to prescribe any future products; and

unforeseen costs and expenses associated with creating an independent sales and marketing organization.

If we enter into arrangements with third parties to perform sales, marketing and distribution services, our product revenue or the 
profitability of these product revenue to us may be lower than if we were to market and sell any products that we develop ourselves. In 
addition, we may not be successful in entering into arrangements with third parties to sell and market our product candidates or may 
be unable to do so on terms that are favorable to us. We may have little control over such third parties, and any of them may fail to 
devote the necessary resources and attention to sell and market our products effectively. If we do not establish sales and marketing 
capabilities successfully, either on our own or in collaboration with third parties, we will not be successful in commercializing our 
product candidates.

We face substantial competition, which may result in others discovering, developing or commercializing products before or more 
successfully than we do. 

The development and commercialization of new drug products is highly competitive. Research and discoveries by others may 

result in breakthroughs which may render our products obsolete even before they generate any revenue. We face competition with 
respect to our current product candidates, and will face competition with respect to any product candidates that we may seek to 
develop or commercialize in the future, from major pharmaceutical companies, specialty pharmaceutical companies and 
biotechnology companies worldwide. There are a number of large pharmaceutical and biotechnology companies that currently market 
and sell products or are pursuing the development of products for the treatment of the cancer indications for which we are focusing our 
product development efforts. Some of these competitive products and therapies are based on scientific approaches that are the same as 
or similar to our approach and others are based on entirely different approaches. Potential competitors also include academic 
institutions, government agencies and other public and private research organizations that conduct research, seek patent protection and 
establish collaborative arrangements for research, development, manufacturing and commercialization.

We are developing our product candidates for the treatment of various cancers. There are a variety of available drug therapies 

marketed for cancer. In many cases, these drugs are administered in combination to enhance efficacy. Some of the currently approved 
drug therapies are branded and subject to patent protection, and others are available on a generic basis. Many of these approved drugs 
are well-established therapies and are widely accepted by health care professionals, patients and third-party payors. Insurers and other 
third-party payors may also encourage the use of generic products. We expect that if our product candidates are approved, they will be 
priced at a significant premium over competitive generic products. This may make it difficult for us to achieve our business strategy of 
using our product candidates in combination with existing therapies or replacing existing therapies with our product candidates.

There are also a number of product candidates in preclinical and clinical development by third parties to treat cancer by 
targeting cellular metabolism. Our principal competitors in the fields of tumor immunology, tumor metabolism, and/or other product 
candidates in development for advanced cancer treatment include Agios Pharmaceuticals, Inc., Arcus Biosciences, Inc., AstraZeneca 
plc, Boehringer Ingelheim GmbH, Bayer Pharma AG, Bristol-Myers Squibb Company, Celgene Corporation, Corvus Pharmaceuticals, 
Inc., Eisai Co., Ltd., Eli Lilly and Company, GlaxoSmithKline plc, Immunomedics Inc., Incyte Corporation, Ipsen, iTeos Therapeutics 
SA, Merck & Co., Merck KGaA, Nektar Therapeutics, Novartis International AG, Pfizer Inc, Roche Holdings AG and its subsidiary 
Genentech, Inc., Takeda Pharmaceutical Co., Ltd., and Xynomic Pharmaceuticals, Inc.

Our primary competitors in the field of Cystic Fibrosis include AbbVie, Inc., AIT Therapeutics, Inc., Corbus Pharmaceuticals, 

Inc., Flatley Discovery Lab, LLC, Galapagos NV, Novartis AG, Novoteris, LLC, Proteostatis Therapeutics, Inc., ProQR Therapeutics 
NV, Translate Bio, Inc., and Vertex Pharmaceuticals, Inc.

29

Our competitors may develop products that are more effective, safer, more convenient or less costly than any that we are 
developing or that would render our product candidates obsolete or non-competitive. In addition, our competitors may discover 
biomarkers that more efficiently measure metabolic pathways than our methods, which may give them a competitive advantage in 
developing potential products. Our competitors may also obtain marketing approval from the FDA or other regulatory authorities for 
their products sooner 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. Many of our competitors have significantly greater financial 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 pharmaceutical and biotechnology industries may result in even more 
resources being concentrated among a smaller number of our competitors. Smaller and other early stage companies may also prove to 
be significant competitors, particularly through collaborative arrangements with large and established companies. These third parties 
may compete with us in recruiting and retaining qualified scientific and management personnel, establishing clinical trial sites and 
patient registration for clinical trials, as well as in acquiring technologies complementary to, or necessary for, our programs.

Even if we are able to commercialize any product candidates, these products may become subject to unfavorable pricing 
regulations, third-party reimbursement practices or healthcare reform initiatives, which would harm our business.

The regulations that govern marketing approvals, pricing and reimbursement for new drugs vary widely from country to country. 

In the United States, new and future legislation may significantly change the approval requirements in ways that could involve 
additional costs and cause delays in obtaining approvals. Some countries require approval of the sale price of a drug before it can be 
marketed. In many countries, the pricing review period begins after marketing or product-licensing approval is granted. In some 
foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial marketing 
approval is granted. As a result, we might obtain marketing approval for a drug in a particular country, but then be subject to price 
regulations that delay its commercial launch, possibly for lengthy time periods, and negatively impact the revenue we are able to 
generate from the sale of the drug in that country. Adverse pricing limitations may hinder our ability to commercialize and generate 
revenue from one or more product candidates, even if our product candidates obtain marketing approval.

Our ability to commercialize any product candidates successfully also will depend in part on the extent to which reimbursement 

for these products and related treatments will be available from government health programs, private health insurers and other 
organizations. Government authorities and third-party payors, such as private health insurers and health maintenance organizations, 
decide which medications they will pay for and establish reimbursement levels. A significant 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 payment for particular medications. Increasingly, third-party payors are requiring that drug companies provide them 
with predetermined discounts from list prices and are challenging the prices charged for medical products. Reimbursement may not be 
available for any product that we commercialize and, if reimbursement is available, the level of reimbursement may not be sufficient. 
Reimbursement may impact the demand for, or the price of, any product candidate for which we obtain marketing approval. If 
reimbursement is not available or is available only to limited levels, we may not be able to successfully commercialize any product 
candidate for which we obtain marketing approval.

There may be significant delays in obtaining reimbursement for newly approved products, and coverage may be more limited 

than the purposes for which the product is approved by the FDA or similar regulatory authorities outside the United States. Moreover, 
eligibility for reimbursement does not imply that any product will be paid for in all cases or at a rate that covers our costs, including 
research, development, manufacture, sale and distribution. Interim reimbursement levels for new drugs, if applicable, may also not be 
sufficient to cover our costs and may not be made permanent. Reimbursement rates may vary according to the use of the drug and the 
medical circumstances under which it is used, may be based on reimbursement levels already set for lower cost products or procedures 
or may be incorporated into existing payments for other services. Net prices for drugs may be reduced by mandatory discounts or 
rebates required by government healthcare programs or private payors and by any future relaxation of laws that presently restrict 
imports of drugs from countries where they may be sold at lower prices than in the United States. Third-party payors often rely upon 
Medicare coverage policies and payment limitations in setting their own reimbursement policies. Our inability to promptly obtain 
coverage and profitable payment rates from both government-funded programs and private payors for any approved products that we 
develop could have a material adverse effect on our operating results, our ability to raise capital needed to commercialize our 
approved products and our overall financial condition.

In addition, there has been heightened governmental scrutiny of pharmaceutical pricing practices in light of the rising cost of 

prescription drugs and biologics. Such scrutiny has resulted in several recent 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, and reform government program reimbursement methodologies for drug products. We 
continue to monitor and evaluate the potential impact of these legislative actions and their effect on our business and operations.

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Product liability lawsuits against us could cause us to incur substantial liabilities and could limit the commercialization of any 
product candidates we may develop.

We face an inherent risk of product liability exposure related to the testing of our product candidates in human clinical trials and 

will face an even greater risk if we commercially sell any products that we may develop after approval. If we cannot successfully 
defend ourselves against claims that our product candidates caused injuries, we could incur substantial liabilities. Regardless of merit 
or eventual outcome, liability claims may result in:

•

•

•

•

•

•

•

decreased demand for any product candidates that we may develop;

injury to our reputation and significant negative media attention;

withdrawal of clinical trial participants;

significant costs to defend any related litigation;

substantial monetary awards to trial participants or patients;

loss of revenue; and

the inability to commercialize any products we may develop.

Although we maintain product liability insurance coverage in the amount of up to $10.0 million per claim and in the aggregate, 
it may not be adequate to cover all liabilities that we may incur. We anticipate that we will need to increase our insurance coverage as 
we continue clinical trials and if we successfully commercialize any products. 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.

If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or 
incur costs that could harm our business.

We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory 
procedures and the handling, use, storage, treatment and disposal of hazardous materials and wastes. Our operations involve the use of 
hazardous and flammable materials, including chemicals and biological and radioactive materials. Our operations also produce 
hazardous waste products. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate 
the risk of contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous 
materials, we could be held liable for any resulting damages, and any liability could exceed our resources. We also could incur 
significant costs associated with civil or criminal fines and penalties.

Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our 
employees in our workplace, including those 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, chemical, 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.

Risks Related to Our Dependence on Third Parties

We rely on third parties to conduct our clinical trials and some aspects of our research and preclinical testing and manufacture 
our product candidates, and those third parties may not perform satisfactorily, including failing to meet deadlines for the 
completion of such trials, research or testing.

We currently rely and expect to continue to rely on third parties, such as our collaborators, contract research organizations, 

clinical data management organizations, medical institutions and clinical investigators, to conduct our clinical trials and to conduct 
some aspects of our research and preclinical testing. Any of these third parties may terminate their engagements with us at any time. If 
these third parties do not successfully carry out their contractual duties, meet expected deadlines or conduct our clinical trials in 
accordance with regulatory requirements or our stated protocols, we will not be able to obtain, or may be delayed in obtaining, 
marketing approvals for our product candidates and will not be able to, or may be delayed in our efforts to, successfully 
commercialize our product candidates. Furthermore, these third parties may also have relationships with other entities, some of which 
may be our competitors. If we need to enter into alternative arrangements, it would delay our product development activities.

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Our reliance on these third parties for research and development activities will reduce our control over these activities but will 

not relieve us of our responsibilities. For example, we will remain responsible for ensuring that each of our clinical trials is conducted 
in accordance with the general investigational plan and protocols for the trial, and that all clinical trial activities conducted by our 
contract research organizations follow applicable laws and regulations, and are conducted in an ethical and compliant manner. 
Moreover, the FDA requires us to comply with standards, commonly referred to as Good Clinical Practices, for conducting, recording 
and reporting the results of clinical trials to assure that data and reported results are credible and accurate and that the rights, integrity 
and confidentiality of trial participants are protected. We also are required to register ongoing clinical trials and post the results of 
completed clinical trials on a government sponsored database, available at www.clinicaltrials.gov, within certain timeframes. Failure 
by us, or any of the third parties working on our behalf, to do the above can result in fines, adverse publicity and civil and criminal 
sanctions.

We do not have any manufacturing facilities. We currently rely, and expect to continue to rely, on third party manufacturers for 
the manufacture of our product candidates for preclinical studies and clinical trials and for commercial supply of any of these product 
candidates for which we obtain marketing approval. To date, we have obtained or plan to obtain materials for telaglenastat, 
INCB001158 and CB-280 for our current and planned clinical trials from third-party manufacturers. We have engaged third party 
manufacturers to obtain the active ingredient for telaglenastat, INCB001158 and CB-280 for pre-clinical testing and clinical trials. We 
do not have a long-term supply agreement with any third-party manufacturers, and we purchase our required drug supply on a 
purchase order basis.

We may be unable to establish agreements with third-party manufacturers or to do so on acceptable terms. Even if we are able to 

establish agreements with third-party manufacturers, reliance on third-party manufacturers entails additional risks, including:

•

•

•

reliance on the third party for legal and regulatory compliance and quality assurance;

the possible breach of the manufacturing agreement by the third party; and

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

Third-party manufacturers may not be able to comply with current U.S. Good Manufacturing Practice requirements, or cGMPs, 

or similar legal and regulatory requirements outside the United States. Our failure, or the failure of our third-party manufacturers, to 
comply with applicable regulations could result in sanctions being imposed on us, including fines, injunctions, civil penalties, delays, 
suspension or withdrawal of approvals, license revocation, seizures or recalls of product candidates, operating restrictions and criminal 
prosecutions, any of which could adversely affect supplies of our product candidates and harm our business and results of operations.

Any product that we may develop may compete with other product candidates and products for access to these manufacturing 
facilities. There are a limited number of manufacturers that operate under cGMPs and that might be capable of manufacturing for us.

Any performance failure on the part of our existing or future manufacturers could delay clinical development or marketing 

approval. We do not currently have arrangements in place for redundant supply for bulk drug substances. If any one of our current 
contract manufacturers cannot perform as agreed, we may be required to replace that manufacturer. Although we believe that there are 
several potential alternative manufacturers who could manufacture our product candidates, we may incur added costs and delays in 
identifying and qualifying any such replacement.

Our current and anticipated future dependence upon others for the manufacture of our product candidates or products may 
adversely affect our future profit margins and our ability to commercialize any product candidates that receive marketing approval on 
a timely and competitive basis.

We also currently rely, and expect to continue to rely, on third parties to store and distribute drug supplies for our clinical trials. 

Any performance failure on the part of these third parties could delay clinical development or marketing approval of our product 
candidates or commercialization of our drugs, producing additional losses and depriving us of potential revenue. Although we believe 
that there are several potential alternative third parties who could store and distribute drug supplies for our clinical trials, we may incur 
added costs and delays in identifying and qualifying any such replacement.

The COVID-19 coronavirus could adversely impact our business, including our clinical trials.

In December 2019, a novel strain of coronavirus, COVID-19, was reported to have surfaced in Wuhan, China. Since then, the 

COVID-19 coronavirus has spread to multiple countries, including the United States, specifically California where we are 
headquartered, and several European countries. If the COVID-19 coronavirus continues to spread in the United States, China and 

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Europe, we may experience disruptions that could impact our business, clinical trials and product candidate development efforts. The 
extent to which the COVID-19 coronavirus may impact our business, our clinical trials and product candidate development efforts will 
depend on future developments, which are highly uncertain and cannot be predicted with confidence at this time.

Our arginase inhibitors program in hematology and oncology indications, including INCB001158, is reliant in part on Incyte for 
the successful development and commercialization in a timely manner. If Incyte does not devote sufficient resources to 
INCB001158’s development, is unsuccessful in its efforts, or chooses to terminate its agreement with us, our business, operating 
results and financial condition will be harmed.

We have entered into the Incyte Collaboration Agreement under which we have granted Incyte an exclusive, worldwide license 

to develop and commercialize small molecule arginase inhibitors for hematology and oncology indications, including INCB001158, 
which is currently in Phase 1/2 clinical trials.

Under the agreement, we and Incyte will jointly conduct and co-fund development of INCB001158, with Incyte leading global 

development activities. Unless we opt out of our co-funding obligation, Incyte will fund 70% of global development costs and we will 
be responsible for the remaining 30%. Should we disagree with Incyte about the clinical development or commercialization strategy, 
we could escalate the disagreement to our representatives on the Joint Steering Committee for resolution. We and Incyte are obligated 
to use good faith efforts to resolve such disputes; however, in cases of deadlock, Incyte will have the deciding vote. If the agreement is 
terminated, other than as a result of our breach, with respect to one or more products or countries, all rights in the terminated products 
and countries revert to us. The Incyte collaboration may not be clinically or commercially successful due to a number of important 
factors, including the following:

•

•

•

•

Subject to the terms of our collaboration agreement, including diligence obligations, although Incyte has certain 
obligations to use commercially reasonable efforts to develop and commercialize INCB001158, Incyte has discretion in 
determining the efforts and resources that it will apply to its partnership with us. The timing and amount of any 
development milestones, and downstream commercial milestones and royalties that we may receive under such 
partnership will depend on, among other things, the efforts, allocation of resources and successful development and 
commercialization of INCB001158;

Incyte may select a dose for INCB001158 that does not have a favorable benefit/risk profile;

Incyte may terminate its partnership with us without cause and for circumstances outside of our control, which could 
make it difficult for us to attract new strategic partners or adversely affect how we are perceived in scientific and financial 
communities;

Incyte may develop or commercialize INCB001158 in a way that exposes us to potential litigation that could jeopardize or 
invalidate our intellectual property rights or expose us to potential liability; and

If Incyte were to breach our collaboration agreement, we may need to enforce our rights under the agreement, which could be 

costly. If we were to terminate our agreement with Incyte due to Incyte’s breach or if Incyte were to terminate the agreement without 
cause, there could be a delay in the return of our rights to INCB001158 and the development and commercialization of INCB001158 
would be delayed, curtailed or terminated because we may not have sufficient financial resources or capabilities to continue 
development and commercialization on our own.

Incyte may enter into one or more transactions with third parties, including a merger, consolidation, reorganization, sale of 

substantial assets, sale of substantial stock or other change in control, which could divert the attention of its management and 
adversely affect Incyte’s ability to retain and motivate key personnel who are important to the continued development of the small 
molecule arginase inhibitor program. In addition, the third party to any such transaction could reprioritize Incyte’s development 
programs which could delay the development of our programs or cause Incyte to terminate the agreement.

We have in the past and may seek in the future to selectively establish collaborations, and, if we are unable to establish them on 
commercially reasonable terms, we may have to alter our development and commercialization plans.

Our drug development programs and the potential commercialization of our product candidates will require substantial 
additional cash to fund expenses. In addition to our collaboration with Incyte, for some of our product candidates, we may decide to 
collaborate with additional pharmaceutical and biotechnology companies for the development and potential commercialization of 
those product candidates.

We may also be restricted under existing license agreements from engaging in research and development activities or entering 

into future agreements on certain terms with potential collaborators. For example, pursuant to our license agreement with 

33

Symbioscience, we have agreed not to develop any other arginase inhibitors for use in human healthcare outside of the scope of that 
agreement. In addition, under our agreement with Incyte, we are not allowed to develop any retained arginase inhibitors (small 
molecule arginase inhibitors, other than INCB001158, retained by us for research and development in non-hematology/oncology 
indications) for any indication except specific orphan indications outside of hematology and oncology.

We face significant competition in seeking appropriate collaborators. Whether we reach a definitive agreement for a 
collaboration will depend, among other things, upon our assessment of the collaborator’s resources and expertise, the terms and 
conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors. Those factors may include 
the design or results of clinical trials, the likelihood of approval by the FDA or similar regulatory authorities outside the United States, 
the potential market for the subject product candidate, the costs and complexities of manufacturing and delivering such product 
candidate to patients, the potential of competing products, the existence of uncertainty with respect to our ownership of technology, 
which can exist if there is a challenge to such ownership without regard to the merits of the challenge and industry and market 
conditions generally. The collaborator may also consider alternative product candidates for similar indications that may be available to 
collaborate on and whether such a collaboration could be more attractive than the one with us for our product candidate.

Collaborations are complex and time-consuming to negotiate and document. In addition, there have been a significant number of 
recent business combinations among large pharmaceutical companies that have resulted in a reduced number of potential future 
collaborators.

If we decide to collaborate with any other third parties in connection with any of our development programs or product 
candidates, we may not be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. If we are unable to do so, 
we may have to curtail the development program or the product candidate for which we are seeking to collaborate, reduce or delay its 
development program or one or more of our other development programs, delay its potential commercialization or reduce the scope of 
any sales or marketing activities, or increase our expenditures and undertake development or commercialization activities at our own 
expense. If we elect to increase our expenditures to fund development or commercialization activities on our own, we may need to 
obtain additional capital, which may not be available to us on acceptable terms or at all. If we do not have sufficient funds, we may not 
be able to further develop our product candidates or bring them to market and generate product revenue.

To the extent we enter into any other collaborations, we may depend on such collaborations for the development and 
commercialization of our product candidates. If those collaborations are not successful, we may not be able to capitalize on the 
market potential of our product candidates.

We may selectively seek additional third-party collaborators for the development and commercialization of our product 
candidates. Our current and any future collaborators for any collaboration arrangements include large and mid-size pharmaceutical 
companies, regional and national pharmaceutical companies and biotechnology companies. Pursuant to these arrangements and any 
potential future arrangements, we will have limited control over the amount and timing of resources that our collaborators dedicate to 
the development or commercialization of our product candidates. Our ability to generate revenue from these arrangements will depend 
on our collaborators’ abilities to successfully perform the functions assigned to them in these arrangements.

Collaborations involving our product candidates, including our collaboration with Incyte, pose many risks to us, including that:

•

•

•

•

•

•

Collaborators have significant discretion in determining the efforts and resources that they will apply to these 
collaborations;

Collaborators may not pursue development and commercialization of our product candidates or may elect not to continue 
or renew development or commercialization programs based on clinical trial results, changes in the collaborator’s strategic 
focus or available funding or external factors such as an acquisition that diverts resources or creates competing priorities;

Collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or 
abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for 
clinical testing;

Collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with 
our product candidates or products if the collaborators believe that competitive products are more likely to be successfully 
developed or can be commercialized under terms that are more economically attractive than ours;

A collaborator with marketing and distribution rights to one or more product candidates or products may not commit 
sufficient resources to the marketing and distribution of such drugs;

Collaborators may not properly maintain or defend our intellectual property rights or may use our proprietary information 
in such a way as to invite litigation that could jeopardize or invalidate our proprietary information or expose us to 
potential litigation;

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•

•

•

•

Disputes may arise between the collaborators and us that result in the delay or termination of the research, development or 
commercialization of our product candidates or products or that result in costly litigation or arbitration that diverts 
management attention and resources;

We may lose certain valuable rights under circumstances identified in our collaborations if we undergo a change of 
control;

Collaborations may be terminated and, if terminated, may result in a need for additional capital to pursue further 
development or commercialization of the applicable product candidates; and

Collaboration agreements may not lead to development or commercialization of product candidates in the most efficient 
manner or at all. If a future collaborator of ours were to be involved in a business combination, the continued pursuit and 
emphasis on our product development or commercialization program under such collaboration could be delayed, 
diminished or terminated.

We have in-licensed a portfolio of arginase inhibitors as part of our efforts to develop product candidates for the arginase 
program, and we are substantially dependent on this in-license for that program. To the extent this in-license is terminated, our 
business may be harmed.

Our internal computer systems, or those used by our Clinical Research Organizations or other contractors or consultants, may fail 
or suffer security breaches.

Despite the implementation of security measures, our internal computer systems, and those of our Clinical Research 
Organizations and other third parties on which we rely, are vulnerable to damage from computer viruses and unauthorized access, 
malware, natural disasters, fire, terrorism, war and telecommunication, electrical failures, cyber-attacks or cyber-intrusions over the 
Internet, attachments to emails, persons inside our organization, or persons with access to systems inside our organization. The risk of 
a security breach or disruption, particularly through cyber-attacks or cyber intrusion, including by computer hackers, foreign 
governments, and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and 
intrusions from around the world have increased. While we have not experienced any such material system failure or security breach 
to our knowledge to date, if such an event were to occur and cause interruptions in our operations, it could result in a material 
disruption of our development programs and our business operations. For example, the loss of clinical trial data from completed, 
ongoing or future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover 
or reproduce the data. Likewise, we rely on third parties for the manufacture of our product candidates and to conduct clinical trials, 
and similar events relating to their computer 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, we could incur liability and the further development and commercialization of our future 
product candidates could be delayed.

Risks Related to Our Intellectual Property

Recent laws and rulings by U.S. courts make it difficult to predict how patents will be issued or enforced in our industry.

Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may have a 

significant impact on our ability to protect our technology and enforce our intellectual property rights. There have been numerous 
recent changes to the patent laws and to the rules of the United States Patent and Trademark Office, or the USPTO, which 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, which was signed into law in 2011, includes a transition from a “first-to-invent” system to a “first-to-file” 
system, and changes the way issued patents are challenged. Certain changes, such as the institution of inter partes review proceedings, 
came into effect on September 16, 2012. Substantive changes to patent law associated with the America Invents Act may affect our 
ability to obtain patents, and, if obtained, to enforce or defend them in litigation or post-grant proceedings, all of which could harm our 
business.

Furthermore, the patent positions of companies engaged in the development and commercialization of biologics and 
pharmaceuticals are particularly uncertain. Two cases involving diagnostic method claims and “gene patents” have recently been 
decided by the Supreme Court. On March 20, 2012, the Supreme Court issued a decision in Mayo Collaborative Services v. 
Prometheus Laboratories, Inc., or Prometheus, a case involving patent claims directed to measuring a metabolic product in a patient 
to optimize a drug dosage amount for the patient. According to the Supreme Court, the addition of well-understood, routine or 
conventional activity such as “administering” or “determining” steps was not enough to transform an otherwise patent ineligible 
natural phenomenon into patent eligible subject matter. On July 3, 2012, the USPTO issued guidance indicating that process claims 
directed to a law of nature, a natural phenomenon or an abstract idea that do not include additional elements or steps that integrate the 
natural principle into the claimed invention such that the natural principle is practically applied and the claim amounts to significantly 

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more than the natural principle itself should be rejected as directed to non-statutory subject matter. On June 13, 2013, the Supreme 
Court issued its decision in Association for Molecular Pathology v. Myriad Genetics, Inc., or Myriad, a case involving patent claims 
held by Myriad Genetics, Inc. relating to the breast cancer susceptibility genes BRCA1 and BRCA2. Myriad held that isolated 
segments of naturally occurring DNA, such as the DNA constituting the BRCA1 and BRCA2 genes, is not patent eligible subject 
matter, but that complementary DNA, which is an artificial construct that may be created from RNA transcripts of genes, may be 
patent eligible.

We cannot assure you that our efforts to seek patent protection for our technology and products will not be negatively impacted 
by the decisions described above, rulings in other cases or changes in guidance or procedures issued by the USPTO. We cannot fully 
predict what impact the Supreme Court’s decisions in Prometheus and Myriad may have on the ability of life science companies to 
obtain or enforce patents relating to their products and technologies in the future.

Moreover, although the Supreme Court has held in Myriad that isolated segments of naturally occurring DNA are not patent-
eligible subject matter, certain third parties could allege that activities that we may undertake infringe other gene-related patent claims, 
and we may deem it necessary to defend ourselves against these claims by asserting non-infringement and/or invalidity positions, or 
pay to obtain a license to these claims. In any of the foregoing or in other situations involving third-party intellectual property rights, if 
we are unsuccessful in defending against claims of patent infringement, we could be forced to pay damages or be subjected to an 
injunction that would prevent us from utilizing the patented subject matter. Such outcomes could harm our business.

If we are alleged to infringe intellectual property rights of third parties, our business could be harmed.

Our research, development and commercialization activities may be alleged to infringe patents, trademarks or other intellectual 

property rights owned by other parties. Certain of our competitors and other companies in the industry have substantial patent 
portfolios and may attempt to use patent litigation as a means to obtain a competitive advantage. We may be a target for such litigation. 
Even if our pending patent applications issue, they may relate to our competitors’ activities and may therefore not deter litigation 
against us. The risks of being involved in such litigation may also increase as we become more visible as a public company and move 
into new markets and applications for our product candidates. There may also be patents and patent applications that are relevant to 
our technologies or product candidates that are unknown to us. For example, certain relevant patent applications may have been filed 
but not published. If such patents exist, or if a patent issues on any of such patent applications, that patent could be asserted against us. 
Third parties could bring claims against us that would cause us to incur substantial expenses and, if the claims against us are 
successful, could cause us to pay substantial damages, including treble damages and attorneys’ fees for willful infringement. The 
defense of such a suit could also divert the attention of our management and technical personnel. Further, if an intellectual property 
infringement suit were brought against us, we could be forced to stop or delay research, development or sales of the product that is the 
subject of the suit.

As a result of infringement claims, or to avoid potential claims, we may choose or be compelled to seek intellectual property 

licenses from third parties. These licenses may not be available on acceptable terms, or at all. Even if we are able to obtain a license, 
the license would likely obligate us to pay license fees or royalties or both, and the rights granted to us likely would be nonexclusive, 
which would mean that our competitors also could obtain licenses to the same intellectual property. Ultimately, we could be prevented 
from commercializing a product candidate and/or technology or be forced to cease some aspect of our business operations if, as a 
result of actual or threatened infringement claims, we are unable to enter into licenses of the relevant intellectual property on 
acceptable terms. Further, if we attempt to modify a product candidate and/or technology or to develop alternative methods or 
products in response to infringement claims or to avoid potential claims, we could incur substantial costs, encounter delays in product 
introductions or interruptions in sales.

We may become involved in other lawsuits to protect or enforce our patents or other intellectual property, which could be 
expensive and time-consuming, and an unfavorable outcome could harm our business.

In addition to the possibility of litigation relating to infringement claims asserted against us, we may become a party to other 

patent litigation and other proceedings, including inter partes review proceedings, post-grant review proceedings, derivation 
proceedings declared by the USPTO and similar proceedings in foreign countries, regarding intellectual property rights with respect to 
our current or future technologies or product candidates or products. The cost to us of any patent litigation or other proceeding, even if 
resolved in our favor, could be substantial. Some of our competitors may be able to sustain the costs of such litigation or proceedings 
more effectively than we can because of their substantially greater financial resources. Patent litigation and other proceedings may 
also absorb significant management time. Uncertainties resulting from the initiation and continuation of patent litigation or other 
proceedings could impair our ability to compete in the marketplace.

Competitors may infringe or otherwise violate our intellectual property, including patents that may issue to or be licensed by us. 
As a result, we may be required to file claims in an effort to stop third-party infringement or unauthorized use. Any such claims could 

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provoke these parties to assert counterclaims against us, including claims alleging that we infringe their patents or other intellectual 
property rights. This can be expensive, particularly for a company of our size, and time-consuming, and even if we are successful, any 
award of monetary damages or other remedy we may receive may not be commercially valuable. In addition, in an infringement 
proceeding, a court may decide that our asserted intellectual property is not valid or is unenforceable, or may refuse to stop the other 
party from using the technology at issue on the grounds that our intellectual property does not cover its technology. An adverse 
determination in any litigation or defense proceedings could put our intellectual property at risk of being invalidated or interpreted 
narrowly and could put our patent applications at risk of not issuing.

If the breadth or strength of our patent or other intellectual property rights is compromised or threatened, it could allow third 

parties to commercialize our technology or products or result in our inability to commercialize our technology and products without 
infringing third-party intellectual property rights. Further, third parties may be dissuaded from collaborating with us. 

Interference or derivation proceedings brought by the USPTO or its foreign counterparts may be necessary to determine the 

priority of inventions with respect to our patent applications, and we may also become involved in other proceedings, such as re-
examination proceedings, before the USPTO or its foreign counterparts. Due to the substantial competition in the pharmaceutical 
space, the number of such proceedings may increase. This could delay the prosecution of our pending patent applications or impact the 
validity and enforceability of any future patents that we may obtain. In addition, any such litigation, submission or proceeding may be 
resolved adversely to us and, even if successful, may result in substantial costs and distraction to our management.

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. Moreover, 
intellectual property law relating to the fields in which we operate is still evolving and, consequently, patent and other intellectual 
property positions in our industry are subject to change and are often uncertain. We may not prevail in any of these suits or other 
efforts to protect our technology, and the damages or other remedies awarded, if any, may not be commercially valuable. During the 
course of this type of litigation, 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, the market price for our common stock could 
be significantly harmed.

We may not be able to protect, or fully exploit, our intellectual property rights throughout the world, which could impair our 
competitive position.

Filing, prosecuting, defending and enforcing patents on all of our technologies, product candidates and products throughout the 

world would be prohibitively expensive. As a result, we seek to protect our proprietary position by filing patent applications in the 
United States and in select foreign jurisdictions and cannot guarantee that we will obtain the patent protection necessary to protect our 
competitive position in all major markets. Competitors may use our technologies in jurisdictions where we have not obtained patent 
protection to develop their own products and, further, may export infringing products to territories where we may obtain patent 
protection but where enforcement is not as strong as that in the United States. These products may compete with our current and future 
products in jurisdictions where we do not have any issued patents, and our patent claims or other intellectual property rights may not 
be effective or sufficient to prevent them from so 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 
and other intellectual property protection, which could make it difficult for us to stop the infringement of our patents or the marketing 
of competing products in violation of our proprietary rights generally. The legal systems of certain countries make it difficult or 
impossible to obtain patent protection for pharmaceutical products and services. Proceedings to enforce our patent rights in foreign 
jurisdictions could result in substantial costs and could divert our efforts and attention from other aspects of our business.

Even if we do secure patents in foreign jurisdictions, the legal systems in certain of those countries might require us, as 
examples, to do business through an entity that is partially owned by a local investor, or to grant license rights to local partners in a 
manner not required by the jurisdictions in which we currently operate. Requirements such as the foregoing could limit our ability to 
fully exploit and in the future monetize our product candidates and patents, as well as placing potential additional difficulties on our 
enforcement efforts in those jurisdictions.

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

In addition to seeking patents for some of our technologies and product candidates, we also rely on trade secrets, including 

unpatented know-how, technology and other proprietary information, to maintain our competitive position. We seek to protect these 
trade secrets, in part, by entering into non-disclosure and confidentiality agreements with parties who have access to them, such as our 
employees, corporate collaborators, outside scientific collaborators, contract manufacturers, consultants, advisors and other third 
parties. We also enter into confidentiality and invention assignment agreements with our employees and consultants that obligate them 
to assign to us any inventions developed in the course of their work for us. However, we cannot guarantee that we have executed these 
agreements with each party that may have or have had access to our trade secrets or that the agreements we have executed will provide 
adequate protection. Despite these efforts, any of these parties may breach the agreements and disclose our proprietary information, 

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including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. As a result, we may be forced to 
bring claims against third parties, or defend claims that they bring against us, to determine ownership of what we regard as our 
intellectual property. Monitoring unauthorized disclosure is difficult and we do not know whether the procedures we have followed to 
prevent such disclosure are, or will be adequate. 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 inside and outside the United 
States may be less willing or unwilling to protect trade secrets. If any of the technology or information that we protect as 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.

If our trademarks and trade names are not adequately protected, we may not be able to build name recognition in our markets of 
interest, and our business may be harmed.

Our trademarks or trade names may be challenged, infringed, circumvented, declared generic or determined to be infringing on 

other marks. As a means to enforce our trademark rights and prevent infringement, we may be required to file trademark claims 
against third parties or initiate trademark opposition proceedings. This can be expensive and time-consuming, particularly for a 
company of our size. In addition, in an infringement proceeding, a court may decide that a trademark of ours is not valid or is 
unenforceable, or may refuse to stop the other party from using the trademark at issue. We may not be able to protect our rights to 
these and other trademarks and trade names which we need to build name recognition by potential partners or customers in our 
markets of interest. We do not currently have any registered trademarks in the United States. Any trademark applications in the United 
States and in other foreign jurisdictions where we may file may not be allowed or may subsequently be opposed. In addition, other 
companies in the biopharmaceutical space may be using trademarks that are similar to ours and may in the future allege that our use of 
the trademark infringes or otherwise violates their trademarks. Over the long term, if we are unable to establish name recognition 
based on our trademarks and trade names, then we may not be able to compete effectively and our business may be harmed.

Third parties may assert ownership or commercial rights to inventions we develop.

Third parties may in the future make claims challenging the inventorship or ownership of our intellectual property. We have 

written agreements with collaborators that provide for the ownership of intellectual property arising from our collaborations. In some 
instances, there may not be adequate written provisions to address clearly the resolution of intellectual property rights that may arise 
from a collaboration. If we cannot successfully negotiate sufficient ownership and commercial rights to the inventions that result from 
our collaborations, or if disputes otherwise arise with respect to the intellectual property developed in the course of a collaboration, we 
may be limited in our ability to capitalize on the market potential of these inventions.

In addition, we may face claims by third parties that our agreements with employees, contractors or consultants obligating them 

to assign intellectual property to us are ineffective or are in conflict with prior or competing contractual obligations of assignment, 
which could result in ownership disputes regarding intellectual property we have developed or will develop and interfere with our 
ability to capture the commercial value of such inventions. Litigation may be necessary to resolve an ownership dispute, and if we are 
not successful, we may be precluded from using certain intellectual property, or may lose our exclusive rights in that intellectual 
property. Either outcome could have an adverse impact on our business.

Risks Related to Regulatory Approval of Our Product Candidates and Other Legal Compliance Matters

Even if we complete the necessary preclinical studies and clinical trials, the marketing approval process is expensive, time-
consuming and uncertain and may prevent us from obtaining approvals for the commercialization of some or all of our product 
candidates. If we or our collaborators are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we 
will not be able to commercialize, or will be delayed in commercializing, our product candidates, and our ability to generate 
revenue will be impaired.

Our product candidates and the activities associated with their development and commercialization, including their design, 
testing, manufacture, safety, efficacy, recordkeeping, labeling, storage, approval, advertising, promotion, sale and distribution, are 
subject to comprehensive regulation by the FDA and other regulatory agencies in the United States and by comparable authorities in 
other countries. Failure to obtain marketing approval for a product candidate will prevent us from commercializing the product 
candidate. We have not received approval to market any of our product candidates from regulatory authorities in any jurisdiction. We 
have only limited experience in filing and supporting the applications necessary to gain marketing approvals and expect to rely on 
third-party contract research organizations to assist us in this process. Securing regulatory approval requires the submission of 
extensive preclinical and clinical data and supporting information to the various regulatory authorities for each therapeutic indication 
to establish the product candidate’s safety and efficacy. Securing regulatory approval also requires the submission of information 
about the product manufacturing process to, and inspection of manufacturing facilities by, the relevant regulatory authority. Our 
product candidates may not be effective, may be only moderately effective or may prove to have undesirable or unintended side 
effects, toxicities or other characteristics that may preclude our obtaining marketing approval or prevent or limit commercial use.

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The process of obtaining marketing approvals, both in the United States and elsewhere, is expensive, may take many years and 
can vary substantially based upon a variety of factors, including the type, complexity and novelty of the product candidates involved. 
We cannot assure you that we will ever obtain any marketing approvals in any jurisdiction. Changes in marketing approval policies 
during the development period, changes in or the enactment of additional statutes or regulations or changes in regulatory review for 
each submitted product application may cause delays in the approval or rejection of an application. The FDA and comparable 
authorities in other countries have substantial discretion in the approval process and may refuse to accept any application or may 
decide that our data is insufficient for approval and require additional preclinical or other studies, and clinical trials. In addition, 
varying interpretations of the data obtained from preclinical testing and clinical trials could delay, limit or prevent marketing approval 
of a product candidate. Additionally, any marketing approval we ultimately obtain may be limited or subject to restrictions or post-
approval commitments that render the approved product not commercially viable.

Any product candidate for which we obtain marketing approval could be subject to marketing restrictions or withdrawal from the 
market, and we may be subject to penalties if we fail to comply with regulatory requirements or if we experience unanticipated 
problems with our products.

Any product candidate for which we obtain marketing approval, along with the manufacturing processes, post-approval clinical 
data, labeling, advertising and promotional activities for such product, will be subject to continual requirements of and review by the 
FDA and other regulatory authorities. These requirements include submissions of safety and other post-marketing information and 
reports, registration and listing requirements, cGMP requirements, quality assurance and corresponding maintenance of records and 
documents and requirements regarding the distribution of samples to health care professionals and recordkeeping. Even if marketing 
approval of a product candidate is granted, the approval may be subject to limitations on the indicated uses for which the product may 
be marketed or to the conditions of approval, or contain requirements for costly post-marketing testing and surveillance to monitor the 
safety or efficacy of the medicine. The FDA closely regulates the post approval marketing and promotion of drugs to ensure that they 
are marketed only for the approved indications and in accordance with the provisions of the approved labeling. The FDA imposes 
stringent restrictions on manufacturers’ communications regarding off-label use and if we do not market our products for their 
approved indications, we may be subject to enforcement action for off-label marketing.

In addition, later discovery of previously unknown problems with our products, manufacturers or manufacturing processes, or 

failure to comply with regulatory requirements, may result in, among other things:

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restrictions on such products, manufacturers or manufacturing processes;

restrictions on the labeling, marketing, distribution or use of a product;

requirements to conduct post-approval clinical trials;

warning or untitled letters;

withdrawal of the products from the market;

refusal to approve pending applications or supplements to approved applications that we submit;

recall of products;

fines, restitution or disgorgement of profits or revenue;

suspension or withdrawal of marketing approvals;

refusal to permit the import or export of our products;

product seizure; and

injunctions or the imposition of civil or criminal penalties.

Our relationships with customers and third-party payors will be subject to applicable anti-kickback, fraud and abuse and other 
healthcare laws and regulations, which could expose us to criminal sanctions, civil penalties, contractual damages, reputational 
harm and diminished profits and future earnings.

Healthcare providers, physicians and third-party payors play a primary role in the recommendation and prescription of any 

product candidates for which we obtain marketing approval. Our current and future arrangements with third-party payors and 
customers may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the 
business or financial arrangements and relationships through which we market, sell and distribute our medicines for which we obtain 
marketing approval. Restrictions under applicable federal and state healthcare laws and regulations include the following:

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the federal healthcare anti-kickback statute prohibits, among other things, persons from knowingly and willfully soliciting, 
offering, receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward either the 

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referral of an individual for, or the purchase, order or recommendation of, any good or service, for which payment may be 
made under federal and state healthcare programs such as Medicare and Medicaid;

the federal False Claims Act imposes criminal and civil penalties, including civil whistleblower or qui tam actions, against 
individuals or entities for knowingly presenting, or causing to be presented, to the federal government, claims for payment 
that are false or fraudulent or making a false statement to avoid, decrease or conceal an obligation to pay money to the 
federal government;

the federal Health Insurance Portability and Accountability Act of 1996, as amended by the Health Information 
Technology for Economic and Clinical Health Act, imposes criminal and civil liability for executing a scheme to defraud 
any healthcare benefit program and also imposes obligations, including mandatory contractual terms, with respect to 
safeguarding the privacy, security and transmission of individually identifiable health information;

the federal false statements statute prohibits knowingly and willfully falsifying, concealing or covering up a material fact 
or making any materially false statement in connection with the delivery of or payment for healthcare benefits, items or 
services;

the Physician Payments Sunshine Act requires manufacturers of drugs, devices, biologics and medical supplies to report to 
the Department of Health and Human Services information related to payments and other transfers of value to physicians 
(as defined by such law) and physician ownership and investment interests; and

analogous state laws and regulations, such as state anti-kickback and false claims laws, may apply to sales or marketing 
arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, 
including private insurers, some 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 
in addition to requiring drug manufacturers to report information related to payments to physicians and other health care 
providers, marketing expenditures and/or drug pricing, and other state and local laws require the registration of 
pharmaceutical sales representatives.

Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations 

will involve substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply 
with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If 
our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be 
subject to significant civil, criminal and administrative penalties, damages, fines, possible exclusion from government funded 
healthcare programs, such as Medicare and Medicaid, disgorgement, imprisonment, integrity oversight and reporting obligations to 
resolve allegations of non-compliance with these laws, and the curtailment or restructuring of our operations. If any of the health care 
professionals or other providers or entities with whom we expect to do business are found to be not in compliance with applicable 
laws, they may be subject to significant criminal, civil or administrative sanctions, including exclusions from government funded 
healthcare programs.

Recently enacted and future legislation may increase the difficulty and cost for us to obtain marketing approval of and 
commercialize our product candidates and affect the prices we may obtain.

In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and 

proposed changes regarding the healthcare system that could prevent or delay marketing approval of our product candidates, restrict or 
regulate post-approval activities and affect our ability to profitably sell any product candidates for which we obtain marketing 
approval.

The Medicare Prescription Drug, Improvement, and Modernization Act of 2003, or the Medicare Modernization Act, changed 
the way Medicare covers and pays for pharmaceutical products. The legislation expanded Medicare coverage for drug purchases by 
the elderly and introduced a new reimbursement methodology based on average sales prices for physician-administered drugs. In 
addition, this legislation provided authority for limiting the number of drugs that will be covered in any therapeutic class. Cost 
reduction initiatives and other provisions of this legislation could decrease the coverage and price that we receive for any approved 
products. While the Medicare Modernization Act applies only to drug benefits for Medicare beneficiaries, private payors often follow 
Medicare coverage policy and payment limitations in setting their own reimbursement rates. Therefore, any reduction in 
reimbursement that results from the Medicare Modernization Act may result in a similar reduction in payments from private payors.

Additionally, the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act 
of 2010, or collectively the PPACA, enacted in 2010, made a number of substantial changes in the way healthcare is financed by both 
governmental and private insurers. There continue to be, significant developments in, and continued legislative activity around, 

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attempts to repeal or repeal and replace the PPACA. Due to these efforts, there is significant uncertainty regarding the future of the 
PPACA. 

Since January 2017, President Trump has signed two Executive Orders designed to delay the implementation of any certain 
provisions of the PPACA or otherwise circumvent some of the requirements for health insurance mandated by the ACA. For example, 
the 2020 federal spending package permanently eliminated, effective January 1, 2020, the PPACA-mandated “Cadillac” tax on high-
cost employer-sponsored health coverage and medical device tax and, effective January 1, 2021, also eliminates the health insurer tax. 
In addition, the Centers for Medicare & Medicaid Services issued a final rule, effective for plan year 2020 that gives states greater 
flexibility 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. The Trump administration has also 
announced that it will discontinue the payment of cost-sharing reduction, or CSR, payments to insurance companies until Congress 
approves the appropriation of funds for the CSR payments. The loss of the CSR payments is expected to increase premiums on certain 
policies issued by qualified health plans under the PPACA. A bipartisan bill to appropriate funds for CSR payments has been 
introduced in the Senate, but the future of that bill is uncertain. Further, each chamber of Congress has put forth multiple bills 
designed to repeal or repeal and replace portions of the PPACA. While Congress has not passed comprehensive repeal legislation, 
several bills affecting the implementation of certain taxes under PPACA have been signed into law. The Tax Cuts and Jobs Act of 
2017, or Tax Act, included a provision which repealed, effective January 1, 2019, the tax-based shared responsibility payment 
imposed by PPACA 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”. On December 14, 2018, a Texas U.S. District Court Judge ruled that the PPACA is 
unconstitutional in its entirety because the “individual mandate” was repealed by Congress as part of the Tax Act. Additionally, on 
December 18, 2019, the U.S. Court of Appeals for the 5th Circuit upheld the District Court ruling that the individual mandate was 
unconstitutional and remanded the case back to the District Court to determine whether the remaining provisions of the PPACA are 
invalid as well. It is unclear how this decision, future decisions, subsequent appeals, and other efforts to repeal and replace the PPACA 
will impact the PPACA. We continue to evaluate the potential impact of PPACA and its possible repeal or replacement on our 
business.

Policy changes, including potential modification or repeal of all or parts of the PPACA or the implementation of new health care 

legislation could result in significant changes to the health care system, which may prevent us from being able to generate revenue, 
attain profitability or commercialize our drugs. 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 or lower pricing for our product candidates, or additional pricing pressures.

Further, there has been heightened governmental scrutiny of pharmaceutical pricing practices in light of the rising cost of 
prescription drugs and biologics. Such scrutiny has resulted in several recent 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, and reform government program reimbursement methodologies for drug products. For 
example, the Trump administration’s budget proposal for fiscal year 2021 includes a $135 billion 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. Further, the Trump administration previously released a “Blueprint” to lower drug prices 
and reduce out of pocket costs of drugs that contains additional proposals to increase drug 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. The Department of Health and Human Services has solicited 
feedback on some of these measures and has implemented others under its existing authority. Congress and the Trump administration 
have each indicated that it will continue to seek new legislative and/or administrative measures to control drug costs. In addition, there 
have been and continue to be similar initiatives at the state level to reduce drug costs.

We expect that healthcare reform measures that may be adopted in the future, could have a material adverse effect on our 

industry generally and on our ability to maintain or increase sales of any of our product candidates that we successfully 
commercialize. 

Legislative and regulatory proposals have been made to expand post-approval requirements and restrict sales and promotional 
activities for pharmaceutical products. We cannot be sure whether additional legislative changes will be enacted, or whether the 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 the U.S. 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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Risks Related to Employee Matters and Managing Growth

Our future success depends on our ability to retain our senior management team and to attract, retain and motivate qualified 
personnel.

We are highly dependent upon our senior management team, as well as the other principal members of our research and 
development teams. All of our executive officers are employed “at will,” meaning we or they may terminate the employment 
relationship at any time. We do not maintain “key person” insurance for any of our executives or other employees. The loss of the 
services of any of these persons could impede the achievement of our research, development and commercialization objectives.

Recruiting and retaining qualified scientific, clinical, manufacturing and sales and marketing personnel will also be critical to 

our success. We may not be able to attract and retain these personnel on acceptable terms given the competition among numerous 
pharmaceutical and biotechnology companies for similar personnel. We also experience competition for the hiring of scientific and 
clinical personnel from universities and research institutions. In addition, we rely on consultants and advisors, including scientific and 
clinical advisors, to assist us in formulating our research and development and commercialization strategy. Our consultants and 
advisors may be employed by employers other than us and may have commitments under consulting or advisory contracts with other 
entities that may limit their availability to us.

We expect to expand our operations, and may encounter difficulties in managing our growth, which could disrupt our business.

We expect to expand the scope of our operations, particularly in the areas of drug development, regulatory affairs and sales and 

marketing. To manage our anticipated future growth, we must continue to implement and improve our managerial, operational and 
financial systems, expand our facilities and continue to recruit and train additional qualified personnel. We may not be able to 
effectively manage the expected expansion of our operations or recruit and train additional qualified personnel. Moreover, the 
expected expansion of our operations may lead to significant costs and may divert our management and business development 
resources. For example, our facilities expenses may increase, or decrease which will vary depending on the time and terms of any 
facility lease or sublease we may enter into from time to time. Any inability to manage growth could delay the execution of our 
business plans or disrupt our operations.

We may engage in acquisitions that could disrupt our business, cause dilution to our stockholders or reduce our financial 
resources.

In the future, we may enter into transactions to acquire other businesses, products or technologies. Because we have not made 

any acquisitions to date, our ability to do so successfully is unproven. If we do identify suitable candidates, we may not be able to 
make such acquisitions on favorable terms, or at all. Any acquisitions we make may fail to strengthen our competitive position, and 
these transactions may be viewed negatively by customers or investors. We may decide to incur debt in connection with an acquisition 
or issue our common stock or other equity securities to the stockholders of the acquired company, which would reduce the percentage 
ownership of our existing stockholders. We could incur losses resulting from undiscovered liabilities of the acquired business that are 
not covered by the indemnification we may obtain from the seller. In addition, we may not be able to successfully integrate the 
acquired personnel, technologies and operations into our existing business in an effective, timely and non-disruptive manner. 
Acquisitions may also divert management attention from day-to-day responsibilities, increase our expenses and reduce our cash 
available for operations and other uses. We cannot predict the number, timing or size of future acquisitions or the effect that any such 
transactions might have on our operating results.

International expansion of our business exposes us to business, regulatory, political, operational, financial and economic risks 
associated with doing business in various jurisdictions globally.

Our business strategy incorporates international expansion, including establishing and maintaining relationships with service 

providers, distributors and manufacturers globally. Doing business internationally involves a number of risks, including:

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multiple, conflicting and changing laws and regulations such as tax laws, export and import restrictions, employment laws, 
anti-bribery and anti-corruption laws, regulatory requirements and other governmental approvals, permits and licenses;

failure by us or our distributors to obtain appropriate licenses or regulatory approvals for the sale or use of our product 
candidates, if approved, in various countries;

difficulties in managing foreign operations;

financial risks, such as difficulty enforcing contracts exposure to foreign currency exchange rate fluctuations;

reduced protection for intellectual property rights;

reduced protection of contractual rights in the event of bankruptcy or insolvency of the other contracting party;

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natural disasters, political and economic instability, including wars, terrorism and political unrest, outbreak of disease, 
boycotts, curtailment of trade and other business restrictions;

difficulties in complying with changes in laws, regulations and costs affecting our foreign operations, including our 
United Kingdom, or UK, operations potentially affected by the UK exiting the European Union, or EU;

failure to comply with foreign laws, regulations, standards and regulatory guidance governing the collection, use, 
disclosure, retention, security and transfer of personal data, including the European Union General Data Privacy 
Regulation, or GDPR, which introduces strict requirements for processing personal data of individuals within the 
European Union; and

failure to comply with the United Kingdom Bribery Act 2010, or UK Bribery Act, and similar antibribery and 
anticorruption laws in other jurisdictions, and the Foreign Corrupt Practices Act, including its books and records 
provisions and its anti-bribery provisions, including by failing to maintain accurate information and control over sales and 
distributors’ activities.

The UK’s withdrawal from the EU, commonly referred to as Brexit, may have a negative effect on global economic conditions, 
financial markets and our business.

Following the result of a referendum in 2016, the United Kingdom left the European Union on January 31, 2020, commonly 

referred to as Brexit. Pursuant to the formal withdrawal arrangements agreed between the United Kingdom and the European Union, 
the United Kingdom will be subject to the Transition Period until December 31, 2020 during which European Union rules will 
continue to apply. Negotiations between the United Kingdom and the European Union are expected to continue in relation to the 
customs and trading relationship between the United Kingdom and the European Union following the expiry of the Transition Period.

The lack of clarity over which EU laws and regulations will continue to be implemented in the United Kingdom after the 
Transition Period (including financial laws and regulations, tax and free trade agreements, intellectual property rights, data protection 
laws, supply chain logistics, environmental, health and safety laws and regulations, immigration laws and employment laws) may 
negatively impact foreign direct investment in the United Kingdom, increase costs, depress economic activity and restrict access to 
capital. The uncertainty concerning the United Kingdom’s legal, political and economic relationship with the European Union after 
the Transition Period may be a source of instability in the international markets, create significant currency fluctuations, and/or 
otherwise adversely affect trading agreements or similar cross-border co-operation arrangements (whether economic, tax, fiscal, legal, 
regulatory or otherwise).

These developments, or the perception that any of them could occur, have had, and may continue to have, a significant adverse 

effect on global economic conditions and the stability of global financial markets, and could significantly reduce global market 
liquidity and limit the ability of key market participants to operate in certain financial markets. In particular, it could also lead to a 
period of considerable uncertainty in relation to the United Kingdom’s financial and banking markets, as well as on the regulatory 
process in Europe. Asset valuations, currency exchange rates and credit ratings may also be subject to increased market volatility.

If the United Kingdom and the European Union are unable to negotiate acceptable withdrawal terms or if other EU Member 

States pursue withdrawal, barrier-free access between the United Kingdom and other EU Member States or among the European 
Economic Area, or EEA, overall could be diminished or eliminated. The long-term effects of Brexit will depend on any agreements 
(or lack thereof) between the United Kingdom and the European Union and, in particular, any arrangements for the United Kingdom 
to retain access to EU markets after the Transition Period.

Such a withdrawal from the European Union is unprecedented, and it is unclear how the United Kingdom’s access to the 
European single market for goods, capital, services and labor within the European Union, or single market, and the wider commercial, 
legal and regulatory environment, will impact us.  

Risks Related to Our Common Stock

The trading price of our common stock is likely to be volatile, and purchasers of our common stock could incur substantial losses.

Our stock price has fluctuated in the past and is likely to be volatile in the future. The stock market in general and the market for 
biotechnology companies in particular have experienced extreme volatility that has often been unrelated to the operating performance 
of particular companies. As a result of this volatility, investors may experience losses on their investment in our common stock. The 
market price for our common stock may be influenced by many factors, including:

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the success of competitive products or technologies;

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regulatory actions with respect to our product candidates or our competitors’ product and product candidates;

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

results of clinical trials of our product candidates or those of our competitors;

regulatory or legal developments in the United States and other countries;

developments or disputes concerning patent applications, issued patents or other proprietary rights;

the recruitment or departure of key personnel;

actual and anticipated fluctuations in our quarterly operating results;

the level of expenses related to any of our product candidates or clinical development programs;

the results of our efforts to in-license or acquire additional products or product candidates;

actual or anticipated changes in estimates as to financial results, development timelines or recommendations by securities 
analysts;

variations in our financial results or those of companies that are perceived to be similar to us;

fluctuations in the valuation of companies perceived by investors to be comparable to us;

inconsistent trading volume levels of our shares;

announcement or expectation of additional financing efforts;

sales of our common stock by us, our insiders or our other stockholders;

changes in the structure of healthcare payment systems;

market conditions in the pharmaceutical and biotechnology sectors;

general economic, industry and market conditions; and

the other factors described in this “Risk Factors” section.

In addition, in the past, stockholders have initiated class action lawsuits against companies following periods of volatility in the 

market prices of these companies’ stock. Such litigation, if instituted against us, could cause us to incur substantial costs and divert 
management’s attention and resources.

Concentration of ownership of our common stock among our existing executive officers, directors and principal stockholders may 
prevent new investors from influencing significant corporate decisions.

Our executive officers, directors and current beneficial owners of 5% or more of our common stock, in the aggregate, 
beneficially own a significant percentage of our outstanding common stock. These persons, acting together, will be able to 
significantly influence all matters requiring stockholder approval, including the election and removal of directors and any merger or 
other significant corporate transactions. The interests of this group of stockholders may not coincide with the interests of other 
stockholders.

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

The trading market for our common stock will depend in part on the research and reports that securities or industry analysts 

publish about us or our business, our market and our competitors. We do not have any control over these analysts. If one or more of 
the analysts who cover us downgrade our shares or change their opinion of our shares, our share price would likely decline. If one or 
more of these analysts cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial 
markets, which could cause our share price or trading volume to decline.

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We have and will incur costs and demands upon management as a result of complying with the laws and regulations affecting 
public companies in the United States, which may harm our operating results.

As a public company listed in the United States, we have and will continue to incur significant additional legal, accounting and 

other expenses. In addition, changing laws, regulations and standards relating to corporate governance and public disclosure, including 
regulations implemented by the Securities and Exchange Commission, or SEC, and the Nasdaq Global Select Market, may increase 
legal and financial compliance costs and make some activities more time-consuming. These laws, regulations and standards are 
subject to varying interpretations, and as a result, their application in practice may evolve over time as new guidance is provided by 
regulatory and governing bodies. We intend to invest resources to comply with evolving laws, regulations and standards, and this 
investment may result in increased general and administrative expenses and a diversion of management’s time and attention from 
revenue-generating activities to compliance activities. If, notwithstanding our efforts to comply with new laws, regulations and 
standards, we fail to comply, regulatory authorities may initiate legal proceedings against us, and our business may be harmed.

Further, failure to comply with these laws, regulations and standards might also make it more difficult for us to obtain certain 

types of insurance, including director and officer liability insurance, and we might be forced to accept reduced policy limits and 
coverage or incur substantially higher costs to obtain the same or similar coverage. The impact of these events could also make it more 
difficult for us to attract and retain qualified persons to serve on our Board of Directors, on committees of our Board of Directors or as 
members of senior management.

We do not anticipate paying any cash dividends on our common stock so any returns will be limited to changes in the value of our 
common stock.

We have never declared or paid cash dividends on our common stock. We currently intend to retain our future earnings, if any, 

to fund the development and growth of our business. In addition, the terms of any existing or future credit facility may restrict our 
ability to pay dividends. Any return to stockholders will therefore be limited to the increase, if any, of our stock price.

If we are unable to maintain proper and effective internal controls over financial reporting, the accuracy and timeliness of our 
financial reporting and the market price of our common stock may be adversely affected.

Effective internal controls are necessary for us to provide reliable financial reports and to protect from fraudulent, illegal or 
unauthorized transactions. If we cannot provide effective controls and reliable financial reports, our business and operating results 
could be harmed. We have in the past discovered, and may in the future discover, areas of our internal controls that need improvement. 
We are required, pursuant to Section 404 of the Sarbanes-Oxley Act, to furnish a report by management on the effectiveness of our 
internal control over financial reporting. Our independent registered public accounting firm also needs to attest to the effectiveness of 
our internal control over financial reporting.

If material weaknesses or control deficiencies occur in the future, we are unable to comply with the requirements of Section 404 

in a timely manner, we are unable to assert that our internal control over financial reporting is effective, or if our independent 
registered public accounting firm is unable to express an opinion as to the effectiveness of our internal control over financial 
reporting, we may be unable to report our financial results accurately on a timely basis, which could cause our reported financial 
results to be materially misstated and result in the loss of investor confidence and cause the market price of our common stock to 
decline.

Provisions in our corporate charter documents and under Delaware law may prevent or frustrate attempts by our stockholders to 
change our management or hinder efforts to acquire a controlling interest in us, and the market price of our common stock may be 
lower as a result.

There are provisions in our certificate of incorporation and bylaws that may make it difficult for a third party to acquire, or 

attempt to acquire, control of our company, even if a change in control was considered favorable by our stockholders.

Our charter documents also contain other provisions that could have an anti-takeover effect, such as:

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establishing a classified Board of Directors so that not all members of our Board of Directors are elected at one time;

permitting the Board of Directors to establish the number of directors and fill any vacancies and newly created 
directorships;

providing that directors may only be removed for cause;

prohibits cumulative voting for directors;

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

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authorizing the issuance of “blank check” preferred stock that our Board of Directors could use to implement a 
stockholder rights plan;

eliminating the ability of stockholders to call special meetings of stockholders; and

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

Moreover, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General 
Corporation Law, which prohibit a person who owns 15% or more of our outstanding voting stock from merging or combining with us 
for a period of three years after the date of the transaction in which the person acquired in excess of 15% of our outstanding voting 
stock, unless the merger or combination is approved in a prescribed manner. Any provision in our certificate of incorporation or our 
bylaws or Delaware law that has the effect of delaying or deterring a change in control could limit the opportunity for our stockholders 
to receive a premium for their shares of our common stock, and could also affect the price that some investors are willing to pay for 
our common stock.

Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware is the exclusive 
forum for substantially all disputes between us and our stockholders, which could limit our stockholders’ ability to obtain a 
favorable judicial forum for disputes with us or our directors, officers or employees.

Our amended and restated certificate of incorporation provides that the Court of Chancery of the State of Delaware is the 

exclusive forum for any derivative action or proceeding brought on our behalf; any action asserting a breach of fiduciary duty; any 
action asserting a claim against us arising pursuant to the Delaware General Corporation Law, our amended and restated certificate of 
incorporation or our bylaws; or any action asserting a claim against us that is governed by the internal affairs doctrine. The choice of 
forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or our 
directors, officers or other employees, which may discourage such lawsuits against us and our directors, officers and other employees. 
Some companies that adopted a similar federal district court forum selection provision are currently subject to a suit in the Chancery 
Court of Delaware by stockholders who assert that the provision is not enforceable. If a court were to find the choice of forum 
provision contained in our amended and restated certificate of incorporation to be inapplicable or unenforceable in an action, we may 
incur additional costs associated with resolving such action in other jurisdictions, which could harm our business and financial 
condition.

Item 1B.

Unresolved Staff Comments. 

None.

Item 2.

Properties. 

Our headquarters are located at 343 Oyster Point Blvd., Suite 200, South San Francisco, California 94080 under a lease that 

expires in January 2024, with an option to extend another two years to January 2026. We subleased a portion of this office and 
laboratory space to another biotechnology company under a three-year sublease agreement that expired in February 2020.  We believe 
that our existing facilities are adequate for our current needs, as the facilities have sufficient laboratory space to house additional 
employees to be hired as we expand. 

Item 3.

Legal Proceedings. 

From time to time, we may become involved in legal proceedings relating to claims arising from the ordinary course of business. 

Our management believes that there are currently no claims or actions pending against us, the ultimate disposition of which could 
have a material adverse effect on our results of operations, financial condition or cash flows. 

Item 4.

Mine Safety Disclosures.

Not applicable.

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Item 5.

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

Market Information

Our common stock commenced trading on the Nasdaq Global Select Market under the symbol "CALA" on October 2, 2014.

PART II

Holders of Record

As of March 5, 2020, there were approximately 21 holders of record of our common stock. 

Dividend Policy

We have never declared or paid cash dividends on our capital stock. We intend to retain all available funds and any future 

earnings, if any, to fund the development and expansion of our business and we do not anticipate paying any cash dividends in the 
foreseeable future. Any future determination related to dividend policy will be made at the discretion of our Board of Directors.

Recent Sales of Unregistered Securities

None.

Issuer Purchases of Equity Securities

None. 

Item 6.

Selected Financial Data. 

Not required. 

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Item 7.

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

You should read the following discussion and analysis of our financial condition and results of operations in conjunction with 

our consolidated financial statements and related notes included in Part II, Item 8 of this report. 

This discussion and analysis generally covers our financial condition and results of operations for the year ended December 31, 

2019, including year-over-year comparisons versus the year ended December 31, 2018. Our Annual Report on Form 10-K for the 
year ended December 31, 2018, filed with the SEC on March 7, 2019, and available free of charge on the SEC’s website at 
www.sec.gov and at our investor relations website www.calithera.com, includes a discussion and analysis of our financial condition 
and results of operations for the year ended December 31, 2017 in Item 7 of Part II, “Management’s Discussion and Analysis of 
Financial Condition and Results of Operations.”

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the Securities 
Exchange Act of 1933, as amended, or the Securities Act, and Section 21E of the Securities Exchange Act of 1934, as amended, or the 
Exchange Act. Forward-looking statements are identified by words such as “believe,” “will,” “may,” “estimate,” “continue,” 
“anticipate,” “intend,” “should,” “plan,” “expect,” “predict,” “could,” “potentially” or the negative of these terms or similar 
expressions. You should read these statements carefully because they discuss future expectations, contain projections of future results 
of operations or financial condition, or state other “forward-looking” information. These statements relate to our future plans, 
objectives, expectations, intentions and financial performance and the assumptions that underlie these statements. These forward-
looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those 
anticipated in the forward-looking statements. Factors that might cause such a difference include, but are not limited to, those 
discussed in this report in Part I, Item 1A — “Risk Factors,” and elsewhere in this report. Forward-looking statements are based on 
our management’s beliefs and assumptions and on information currently available to our management. These statements, like all 
statements in this report, speak only as of their date, and we undertake no obligation to update or revise these statements in light of 
future developments. We caution investors that our business and financial performance are subject to substantial risks and 
uncertainties. In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject. 
These statements are based on information available to us as of the date of this Annual Report on Form 10-K. While we believe that 
information provides a reasonable basis for these statements, that information may be limited or incomplete. Our statements should 
not be read to indicate that we have conducted an exhaustive inquiry into or review of, all relevant information. These statements are 
inherently uncertain and investors are cautioned not to unduly rely on these statements.

Overview

We are a clinical-stage bio-pharmaceutical company focused on fighting cancer and other life-threatening diseases by 
discovering and developing novel small molecule drugs that target cellular metabolism. Tumor metabolism and immuno-oncology 
have emerged as promising new fields for cancer drug discovery, and recent clinical successes with therapeutic agents in each field 
have created fundamentally new potential therapies for cancer patients. With our unique approach, we have established a broad 
pipeline of small molecule drug candidates that target enzymes controlling metabolically critical pathways in tumor cells and immune 
cells. We have multiple internally discovered clinical stage compounds that are all enzyme inhibitors. While we are primarily focused 
on oncology, we may opportunistically develop therapeutics outside of oncology where we can leverage our existing expertise in 
immune cell metabolism to treat diseases with unmet need.

Through genetic mutations that alter fundamental metabolic pathways, cancer cells can acquire the ability to grow in an 

uncontrolled manner, but they also acquire nutrient dependencies that can differentiate them from normal cells. Targeting these 
nutrient dependencies by inhibiting specific metabolic pathways in cancer cells is a novel therapeutic approach to blocking the 
uncontrolled growth of tumors. Our lead product candidate, telaglenastat (CB-839), takes advantage of the critical dependency many 
cancers have on the nutrient glutamine for growth and survival. We believe telaglenastat has the potential to be an important new 
therapeutic agent with a novel mechanism of action for the treatment of a broad range of cancers, and is the first selective allosteric 
glutaminase inhibitor to enter clinical trials. We retain all commercial rights to telaglenastat and have been granted a U.S. patent, 
which includes composition of matter coverage for telaglenastat through 2032.

We are currently developing telaglenastat in combination with standard therapies in a select set of solid tumors. Our lead 

development pathway is in renal cell carcinoma, or RCC, where we are evaluating telaglenastat in the CANTATA trial 
(NCT03428217), a global, randomized, double-blind trial designed to evaluate the safety and efficacy of telaglenastat in combination 
with cabozantinib versus placebo with cabozantinib in patients with advanced clear cell RCC patients who have been treated with one 
or two prior lines of systemic therapy. The primary endpoint is progression-free survival, or PFS, by blinded independent review, and 
a key secondary endpoint is overall survival. The trial is designed with registrational intent. The U.S. Food and Drug Administration, 
or FDA, has granted Fast Track designation to telaglenastat in combination with cabozantinib, for the treatment of patients with 
metastatic RCC who have received one or two prior lines of therapy. The CANTATA trial completed enrollment of 444 patients in 
October 2019 and we plan to report topline efficacy and safety data in late third quarter or fourth quarter 2020. In June 2019, we 
reported the results of the randomized, double blind, placebo-controlled ENTRATA study of telaglenastat, which met its primary 
endpoint. ENTRATA provides the first clinical proof of concept for telaglenastat in a randomized trial. 

48

We also plan to develop telaglenastat for the treatment of NRF2/KEAP1 mutated non-small cell lung cancer (NSCLC). The 

NRF2/KEAP1 pathway is known to drive the development of certain cancers, including a significant proportion of NSCLC, through 
the regulation of reactive oxygen species (ROS) in a manner that makes cells highly dependent on glutaminase activity. We plan to 
initiate a randomized, placebo controlled trial (NCT04250545) in first line patients with non-squamous NSCLC with tumors that 
harbor mutations in either the KEAP1 or NRF2 gene in the first half of 2020. We will be evaluating the combination of telaglenastat 
plus pembrolizumab and standard chemotherapy versus placebo with pembrolizumab and standard chemotherapy. We plan to present 
interim data from this trial in 2021. 

Our product candidate, INCB001158 is an oral inhibitor of arginase, an enzyme that depletes the amino acid arginine, a key 
metabolic nutrient for T-cells. INCB001158 was discovered by Calithera and is being co-developed with Incyte Corporation, or Incyte, 
for oncology and hematology indications, and is currently being evaluated in Phase 1/2 trials as a monotherapy and in combination 
with other anti-cancer agents. Arginase depletes arginine, a nutrient that is critical for the activation and proliferation of the body’s 
cancer-fighting immune cells, such as cytotoxic T-cells and natural killer (NK)-cells. In some physiological circumstances such as 
maternal-fetal immune tolerance, arginase-mediated depletion of arginine plays an important role in suppressing the immune system. 
But in many tumors, arginase-expressing myeloid cells accumulate and maintain an immunosuppressive environment, blocking the 
ability of T-cells and NK-cells to kill cancer cells. We have demonstrated that arginase-expressing myeloid cells can accumulate in a 
number of cancers, including lung, gastrointestinal, bladder, renal, squamous cell head and neck and acute myeloid leukemia. We 
believe that inhibitors of arginase can promote an anti-tumor immune response by restoring arginine levels, thereby allowing 
activation of the body’s own immune cells, including cytotoxic T-cells and NK-cells.

Arginase inhibitors also have potential in the treatment of cystic fibrosis; accordingly, we have selected CB-280, a unique oral 

arginase inhibitor, for the treatment of cystic fibrosis, or CF, patients. It is a novel oral arginase inhibitor which is solely owned by 
Calithera. We have completed a Phase 1 Single Ascending Dose trial to evaluate the safety, tolerability and pharmacokinetic profile of 
oral CB-280 in healthy volunteers and plan to open a study in CF patients in the first half of 2020. We plan to present data from this 
trial in 2021.

We are a fully integrated biopharmaceutical company with expertise in biology and chemistry, and our ongoing research efforts 

are focused on discovering additional product candidates for the treatment of cancer and other life-threatening diseases. We have 
discovered and developed the clinical candidate CB-708, a potent, selective, orally administered small molecule that inhibits CD73, an 
enzyme that converts adenosine monophosphate to generate the immunosuppressive agent adenosine. We have also developed an 
investigational first-in-class, potent, orally administered IL4I1 inhibitor as a novel immuno-oncology approach to cancer.

Critical Accounting Polices 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 United States generally accepted accounting principles, or 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.

Revenue Recognition

Effective January 1, 2018, we adopted Accounting Standards Codification, or ASC, Revenue from Contracts with Customers 
(Topic 606), or ASC 606, using the modified retrospective approach. Under this approach, we recorded a cumulative adjustment to 
decrease accumulated deficit and deferred revenue by $8.8 million on January 1, 2018. Under ASC 606, an entity recognizes revenue 
when its customer obtains control of promised goods or services, in an amount that reflects the consideration that the entity expects to 
receive in exchange for those goods or services. To determine revenue recognition for arrangements that an entity determines are 
within the scope of ASC 606, the entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the 
performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance 
obligations in the contract; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. We only apply the 
five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or 
services we transfer to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, we 
assess the goods or services promised within each contract and determine those that are performance obligations, and assess whether 

49

each promised good or service is distinct. We then recognize as revenue the amount of the transaction price that is allocated to the 
respective performance obligation when (or as) the performance obligation is satisfied.  

We have a collaboration and licensing agreement that is within the scope of ASC 606, under which we license certain rights to 

one of our product candidates to Incyte Corporation. The terms of this arrangement include payment to us of a non-refundable, upfront 
license fee, and potential development, regulatory and sales milestones, and sales royalties. Each of these payments results in 
collaboration revenues, except for revenues from royalties on net sales of licensed products, which would be classified as royalty 
revenues.

In determining the appropriate amount of revenue to be recognized as we fulfill our obligations under our agreement, we 

perform the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the 
promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) 
measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the 
performance obligations; and (v) recognition of revenue when (or as) we satisfy each performance obligation.  As part of the 
accounting for these arrangements, we must develop assumptions that require judgment to determine the stand-alone selling price for 
each performance obligation identified in the contract. 

Licenses of Intellectual Property:  If the license to our intellectual property is determined to be distinct from the other 
performance obligations identified in the arrangement, we recognize revenues from non-refundable, upfront fees allocated to the 
license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. For licenses that are 
bundled with other promised goods or services, we utilize judgment to assess the nature of the combined performance obligation to 
determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the appropriate 
method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees. We evaluate the measure of 
progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition.

Milestone Payments:  At the inception of each arrangement that includes development, regulatory or commercial milestone 
payments, we evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the 
transaction price. If it is probable that a significant reversal of cumulative revenue would not occur, the associated milestone value is 
included in the transaction price. Milestone payments that are not within our control or the licensees’ control, such as regulatory 
approvals, are not considered probable of being achieved until those approvals are received or the underlying activity has been 
completed. The transaction price is then allocated to each performance obligation on a relative stand-alone selling price basis, for 
which we recognize revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent 
reporting period, we re-evaluate the probability of achievement of such development milestones and any related constraint, and if 
necessary, adjust our estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis, 
which would affect collaboration revenue in the period of adjustment. 

Royalties:  For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and 

the license is deemed to be the predominant item to which the royalties relate, we recognize revenue at the later of (i) when the related 
sales occur, or (ii) when the performance obligation to which some or all of the royalty has been allocated has been satisfied (or 
partially satisfied). To date, we have not recognized any royalty revenue resulting from any of our licensing arrangements.

Contract Balances

Upfront payments and fees are recorded as deferred revenue upon receipt or when due, and may require deferral of revenue 
recognition to a future period until we perform our obligations under these arrangements. Amounts payable to us are recorded as 
accounts receivable when our right to consideration is unconditional.

We receive payments from Incyte based on billing schedules established in the contract. Upfront payments and fees are recorded 
as deferred revenue upon receipt or when due, and may require deferral of revenue recognition to a future period until we perform our 
obligations under these arrangements. Amounts are recorded as accounts receivable when our right to consideration is 
unconditional. We do not assess whether a contract has a significant financing component if the expectation at contract inception is 
such that the period between payment by the licensees and the transfer of the promised goods or services to the licensees will be one 
year or less.

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Accrued Research and Development Costs

We record accrued liabilities for estimated costs of our research and development activities conducted by third-party service 
providers, which include the conduct of preclinical and clinical studies, and contract manufacturing activities. We record the estimated 
costs of research and development activities based upon the estimated amount of services provided but not yet invoiced, and include 
these costs in accrued liabilities in the balance sheets and within research and development expense in the statements of operations. 
These costs are a significant component of our research and development expenses. We accrue for these costs based on factors such as 
estimates of the work completed and in accordance with agreements established with our third-party service providers under the 
service agreements.

We have not experienced any material differences between accrued costs and actual costs incurred. However, the status and 
timing of actual services performed, number of patients enrolled, and the rate of patient enrollments may vary from our estimates, 
resulting in adjustments to expense in future periods. Changes in these estimates that result in material changes to our accruals could 
materially affect our results of operations.

Stock-Based Compensation 

We recognize compensation costs related to stock options granted to employees, nonemployee directors, and non-employees 
based on the estimated fair value of the awards on the date of grant, net of forfeitures. We account for forfeitures as they occur. We 
estimate the grant date fair value for employee, nonemployee directors, and non-employees, and the resulting stock-based 
compensation expense, using the Black-Scholes option-pricing model. The grant date fair value of the stock-based awards is generally 
recognized on a ratable basis over the requisite service period, which is generally the vesting period of the respective awards.

The Black-Scholes option-pricing model requires the use of highly subjective assumptions, which determine the fair value of 

stock-based awards. These assumptions include:

Expected Term. Our expected term represents the period that our stock-based awards are expected to be outstanding and is 

determined using the simplified method (based on the mid-point between the vesting date and the end of the contractual term).

Expected Volatility. The expected volatility was estimated based on a weighted volatility using both the trading history for our 

common stock and the average volatility for comparable publicly traded biopharmaceutical companies over a period equal to the 
expected term of the stock option grants. The comparable companies were chosen based on their similar size, stage in the life cycle, or 
area of specialty.

Risk-Free Interest Rate. The risk-free interest rate is based on the U.S. Treasury zero coupon issues in effect at the time of grant 

for periods corresponding with the expected term of option.

Expected Dividend. We have never paid dividends on our common stock and have no plans to pay dividends on our common 

stock. Therefore, we used an expected dividend yield of zero. 

Income Taxes 

As of December 31, 2019 and 2018, we had approximately $247.4 million and $167.3 million of federal operating loss 

carryforwards, respectively, and $53.5 million and $53.6 million of state operating loss carryforwards, respectively, available to 
reduce future taxable income. Of the federal net operating loss carryforwards, $129.3 million will begin to expire in 2030, and $118.1 
million will carryforward indefinitely, while state net operating losses begin to expire in 2030.

As of December 31, 2019 and 2018, we also had research and development tax credit carryforwards of approximately $10.7 
million and $8.1 million for federal purposes, respectively, and $5.1 million and $4.3 million for state purposes, respectively, available 
to offset future taxable income tax. If not utilized, the federal carryforwards will expire in various amounts beginning in 2030, and the 
state credits can be carried forward indefinitely.

51

Utilization of the net operating loss carryforwards may be subject to a substantial annual limitation due to the ownership change 
limitations provided by the Internal Revenue Code of 1986, as amended, and similar state provisions. We have performed an analysis 
to determine whether an "ownership change" has occurred from inception to December 31, 2014. Based on this analysis, management 
has determined that there was an ownership change. Additionally, due to stock acquired by investors and reported under Section 13(g), 
we believe that an “ownership change” occurred during 2018, as well. We believe that some of our net operating losses and credit 
carryforwards may be limited by these ownership changes but that any limitation would not have a significant impact to the financial 
statements since there is no utilization of the net operating losses and credit carryforwards and a full valuation allowance exists against 
the net operating losses and credit carryforwards for U.S. tax purposes. Subsequent ownership changes since 2018 may subject us to 
annual limitations of our net operating loss and credit carryforwards. Such annual limitation could result in the expiration of the net 
operating loss and credit carryforwards before utilization.

Financial Overview

Collaboration Revenue 

Collaboration revenue represents the portion of deferred revenue recognized from a $45.0 million upfront fee and $12.0 million 

milestone achieved in the first quarter of 2017, from the Incyte Collaboration Agreement. The combined transaction price of 
$57.0 million was recognized over the estimated period of performance under the Incyte Collaboration Agreement based on the 
measure of progress toward completion for the combined performance obligation, which was satisfied as of June 2018. Effective 
January 1, 2018, we adopted ASC 606 using the modified retrospective approach. Refer to Item 8, Notes to consolidated financial 
statements, Notes 2 and 11, for further information on the adoption of ASC 606 and the Incyte Collaboration Agreement.

Research and Development Expenses

Research and development expenses represent costs incurred to conduct research, such as the discovery and development of our 

product candidates. We recognize all research and development costs as they are incurred. Costs associated with co-development 
activities performed under our collaboration agreements with Incyte, Bristol-Myers Squibb, and Pfizer are included in research and 
development expenses, with any reimbursement of costs reflected as a reduction of such expenses.

Research and development expenses consist primarily of the following:

•

•

•

•

•

•

employee-related expenses, which include salaries, benefits and stock-based compensation;

expenses incurred under agreements with clinical trial sites that conduct research and development activities on our behalf;

laboratory and vendor expenses related to the execution of preclinical studies and clinical trials;

contract manufacturing expenses, primarily for the production of clinical supplies;

facilities and other allocated expenses, which include direct and allocated expenses for rent and maintenance of facilities, 
depreciation expense and other supplies; and

license fees and milestone payments related to our licensing agreements.

The largest component of our total operating expenses has historically been our investment in research and development 
activities including the clinical development of our product candidates. We allocate to research and development expenses the salaries, 
benefits, stock-based compensation expense, and indirect costs of our clinical and preclinical programs on a program-specific basis, 
and we include these costs in the program-specific expenses. 

52

 
The following table shows our research and development expenses for 2019 and 2018: 

Development candidate:

Telaglenastat (CB-839) ....................................................  $
INCB001158..................................................................... 
CB-280 ............................................................................. 
Total development............................................................... 

Preclinical and research:

Preclinical and research....................................................... 
Total.....................................................................................................  $

Year Ended December 31,

2019

2018

(in thousands)

 $

51,019 
10,336 
4,002 
65,357 

10,933 
76,290 

 $

44,264 
7,235 
3,830 
55,329 

10,866 
66,195  

We expect our research and development expenses will increase during the next few years as we advance our product candidates 

into and through clinical trials, and pursue regulatory approval of our product candidates, and as we begin our efforts in the potential 
commercial launch of telaglenastat for RCC, which will also require a significant investment in contract manufacturing and inventory 
build-up related costs. 

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 product candidates. The probability of success of our product candidates may be 
affected by numerous factors, including clinical data, 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 and sale of any of our product candidates.

General and Administrative Expenses

General and administrative expenses consist of personnel costs, allocated expenses and other expenses for outside professional 

services, including legal, audit and accounting services. Personnel costs consist of salaries, benefits and stock-based compensation. 
Allocated expenses consist of facilities and other allocated expenses, which include direct and allocated expenses for rent and 
maintenance of facilities, depreciation expense and other supplies. We have incurred and expect to continue to incur additional 
expenses as a result of operating as a public company, including costs to comply with the rules and regulations applicable to 
companies listed on a national securities exchange and costs related to compliance and reporting obligations pursuant to the rules and 
regulations of the SEC. In addition, we have incurred and expect to continue to incur increased expenses associated with being a 
public company, including additional legal, insurance, investor relations and other increases related to needs for additional human 
resources and professional services. 

Results of Operations

Comparison of the Years Ended December 31, 2019 and 2018 

Years Ended December 31,
2018
2019

Change

$

%

(in thousands, except percentages)

Revenue:

Collaboration revenue .................................................   $
Total revenue.......................................................  

—    $
—   

22,254    $
22,254   

(22,254)  
(22,254)  

-100%  
-100%  

Operating expenses:

Research and development..........................................  
General and administrative..........................................  
Total operating expenses.....................................  
Loss from operations ...........................................................  
Interest and other income, net..............................................  
Net loss ................................................................................   $

76,290   
16,605   
92,895   
(92,895)  
3,035   
(89,860)   $

66,195   
13,340   
79,535   
(57,281)  
2,652   
(54,629)   $

10,095   
3,265   
13,360   
(35,614)  
383   
(35,231)  

15%  
24%  
17%  
62%  
14%  
64%  

53

 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
  
 
  
 
  
 
 
  
  
  
 
  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
 
   
   
   
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Collaboration Revenue    

Collaboration revenue decreased from $22.3 million for 2018, to $0 for 2019, or 100%. The decrease related to the satisfaction 

of our and Incyte’s combined performance obligation under the Incyte Collaboration Agreement, for which revenue recognized in 
each period was determined based on the measure of progress toward the completion of the manufacturing services and technology 
transfer to Incyte, which occurred in June of 2018. Refer to Item 8, Notes to consolidated financial statements, Notes 2 and 11, for 
further information on the Incyte Collaboration Agreement.

Research and Development 

Research and development expenses increased $10.1 million, or 15%, from $66.2 million for 2018 to $76.3 million for 2019. 

The increase of $10.1 million was due to a $6.7 million increase in the telaglenastat program, including for our CANTATA trial where 
we completed enrollment in 2019 and expect top-line results in late third quarter or fourth quarter of 2020, an increase of $3.1 million 
in the INCB001158 program, an increase of $0.2 million in the CB-280 program, and an increase of $0.1 million for investment in our 
early stage research programs. 

General and Administrative

General and administrative expenses increased $3.3 million, or 24%, from $13.3 million for 2018 to $16.6 million for 2019. The 

increase of $3.3 million was primarily related to $2.1 million higher professional services costs mainly for legal and accounting 
services, and $1.0 million in higher personnel-related costs, primarily from higher headcount, salary increases, as well as severance 
payments to a former employee. 

Interest and Other Income, net    

Interest and other income, net increased $0.4 million, from $2.6 million for the year ended December 31, 2018 to $3.0 million 

for the year ended December 31, 2019. The increase of $0.4 million was due to $0.2 million higher interest income generated from 
higher returns on our investments, partially offset by lower average cash equivalents and investment balances compared to the prior 
year, and a $0.2 million increase related to the gain on the sublease of our facility.

Liquidity and Capital Resources

As of December 31, 2019, we had cash, cash equivalents and investments totaling $157.4 million. Our operations have been 

financed by net proceeds from the sale of shares of our capital stock and payments from the Incyte Collaboration Agreement. 

In August 2017, we filed a shelf registration statement on Form S-3 with the Securities and Exchange Commission which 
permits the offering, issuance and sale by us of up to a maximum aggregate offering price of $250.0 million of our common stock. As 
of December 31, 2019, $131.6 million of our common stock remained available for sale, of which up to $7.6 million may be issued 
and sold pursuant to an at-the-market offering program for sales of our common stock under a sales agreement with Jefferies LLC, 
subject to certain conditions as specified in the sales agreement.

In June 2019, we sold 14,375,000 shares of common stock pursuant to an underwriting agreement with SVB Leerink LLC, 

Wells Fargo Securities, LLC, and William Blair & Company, LLC at a public offering price of $4.00 per share for gross proceeds of 
$57.5 million, resulting in net proceeds of $53.8 million after deducting underwriting fees and offering expenses. 

During the year ended December 31, 2019, we sold an aggregate of 9,929,742 shares of common stock pursuant to our at-the-

market offering programs with Jefferies LLC and Cowen and Company LLC, at an average price of approximately $4.54 per share for 
gross proceeds of $45.1 million, resulting in net proceeds of $44.0 million after deducting underwriting fees and offering expenses. 

Our primary uses of cash are to fund operating expenses, primarily research and development expenditures. Cash used to fund 
operating expenses is impacted by the timing of when we pay these expenses, as reflected in the change in our outstanding accounts 
payable and accrued expenses.

We believe that our existing cash, cash equivalents and investments as of December 31, 2019 will be sufficient for us to meet 
our current operating plan for at least the twelve-month period following the filing of our December 31, 2019 Form 10-K. However, 
our forecast of 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. In order to complete the process of 
obtaining regulatory approval for our product candidates and to build the sales, marketing and distribution infrastructure that we 
believe will be necessary to commercialize our product candidates, if approved, we will require substantial additional funding.

54

We have based our projections of operating capital requirements on assumptions that may prove to be incorrect and we may use 
all of our available capital resources sooner than we expect. Because of the numerous risks and uncertainties associated with research, 
development and commercialization of pharmaceutical products, we are unable to estimate the exact amount of our operating capital 
requirements. Our future funding requirements will depend on many factors, including, but not limited to:

•

•

•

•

•

•

•

•

•

the timing and costs of our planned clinical trials for our product candidates;

the timing and costs of our planned preclinical studies of our product candidates;

our success in establishing and scaling commercial manufacturing capabilities;

the number and characteristics of product candidates that we pursue;

the outcome, timing and costs of seeking regulatory approvals;

subject to receipt of regulatory approval, revenue received from commercial sales of our product candidates;

the terms and timing of any future collaborations, licensing, consulting or other arrangements that we may establish;

the amount and timing of any payments we may be required to make in connection with the licensing, filing, prosecution, 
maintenance, defense and enforcement of any patents or patent applications or other intellectual property rights; and

the extent to which we in-license or acquire other products and technologies.

We plan to continue to fund our operations and capital funding needs through reimbursement of expenses under our existing 

collaboration agreements and through equity and/or debt financing. We may also consider further collaborations or selectively 
partnering for clinical development and commercialization. The sale of additional equity would result in additional dilution to our 
stockholders. The incurrence of debt financing would result in debt service obligations and the instruments governing such debt could 
provide for operating and financing covenants that would restrict our operations. If we are not able to secure adequate additional 
funding we may be forced to make reductions in spending, extend payment terms with suppliers, liquidate assets where possible, 
and/or suspend or curtail planned programs. Any of these actions could harm our business, results of operations and future prospects. 

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

Cash used in operating activities............................................... 
Cash (used in) provided by investing activities ........................ 
Cash provided by financing activities ....................................... 

$
$
$

Year Ended December 31,

2019

2018

(in thousands)

(78,745)  $
(10,784)  $
98,908    $

(64,842)
52,799 
14,626  

Cash Flows

Year Ended 2019 Compared with Year Ended 2018

Cash used in operations was ($78.7) million for 2019, compared to ($64.8) million for 2018. The increase of $13.9 million in 

cash used in operations mainly related to increased clinical trial research and development activities, primarily related to our 
teleglenastat, INCB001158 and CB-280 programs.

Cash (used in) provided by investing activities was ($10.8) million and $52.8 million in 2019 and 2018, respectively, and for 

both years primarily related to the purchase and the sale and maturity of investments.  

Cash provided by financing activities was $98.9 million and $14.6 million in 2019 and 2018, respectively. In 2019, we received 
$53.8 million in net proceeds from the sale and issuance of common stock related to our public offering, $43.9 million in net proceeds 
from the issuance of common stock through our at-the-market offering programs, and $1.2 million from the issuance of common stock 
upon the exercise of stock options and from employee stock plan purchases. In 2018, cash provided by financing activities was related 
to $13.7 million in net proceeds from the issuance of common stock through our at-the-market offering program, and the issuance of 
common stock upon the exercise of stock options and employee stock plan purchases of $0.9 million.

55

 
 
 
 
 
 
   
 
 
 
 
Contractual Obligations and Other Commitments 

The following table summarizes our contractual obligations as of December 31, 2019:

Contractual Obligations:

Less Than 1
Year

1 to 3 Years

3 to 5 Years

More Than 5
Years

Total

Payments Due By Period

Operating lease obligations (1)............................   $
Less:  sublease income (2)...................................  

Total contractual obligations (3) ....................   $

2,148    $
(187)  
1,961    $

(In thousands)

4,898    $
—   
4,898    $

2,778    $
—   
2,778    $

—    $
—   
—    $

9,824 
(187)
9,637  

1.

2.

Represents future minimum lease payments under the non-cancelable lease for our headquarters in South San Francisco, 
California. The minimum lease payments above do not include any related common area maintenance charges or real estate 
taxes.
In February 2017, we entered into a non-cancelable sublease agreement for a portion of our facilities, from March 2017 through 
February 2020.

3. We enter into agreements in the normal course of business with organizations for collaborations or in-licensing arrangements, 
contract research organizations for clinical trials and vendors for preclinical studies and other services and products for 
operating purposes which are cancelable at any time by us, generally upon 30 to 60 days prior written notice. These payments 
are not included in this table of contractual obligations.

Off-Balance Sheet Arrangements 

During 2019 and 2018 we did not have any off-balance sheet arrangements.

Recent Accounting Pronouncements

Please refer to Note 2 to our audited consolidated financial statements appearing under Part II, Item 8 for a discussion of recent 

accounting pronouncements.

Item 7A.

Quantitative and Qualitative Disclosures About Market Risk. 

Not required. 

56

 
 
 
 
   
   
   
   
 
 
 
 
 
 
 
 
 
Item 8.

Consolidated Financial Statements and Supplementary Data. 

CALITHERA BIOSCIENCES, INC.

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS 

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

Page

58
59
60
61
62
63
64

57

 
 
Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Calithera Biosciences, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Calithera Biosciences, Inc. (the Company) as of December 31, 
2019 and 2018, the related consolidated statements of operations, comprehensive loss, stockholders' equity and cash flows for each of 
the three years in the period ended December 31, 2019, and the related notes (collectively referred to as the “consolidated financial 
statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the 
Company at December 31, 2019 and 2018, and the results of its operations and its cash flows for each of the three years in the period 
ended December 31, 2019, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), 
the Company's internal control over financial reporting as of December 31, 2019, based on criteria established in Internal Control-
Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our 
report dated March 11, 2020 expressed an unqualified opinion thereon.

Adoption of ASU No. 2014-09

As discussed in Note 2 to the consolidated financial statements, the Company changed its method of accounting for revenue 
recognition due to the adoption of ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), using the modified 
retrospective method effective January 1, 2018. 

Adoption of ASU No. 2016-02

As discussed in Note 2 to the consolidated financial statements, the Company changed its method of accounting for leases in 2019 due 
to the adoption of ASU No. 2016-02, Leases (Topic 842), and the related amendments. 

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 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. 
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.

/s/ Ernst & Young LLP 

We have served as the Company’s auditor since 2014.
Redwood City, California
March 11, 2020

58

Calithera Biosciences, Inc.
Consolidated Balance Sheets 
(in thousands, except per share amounts) 

Assets
Current assets:

Cash and cash equivalents ................................................................................................   $
Short-term investments .....................................................................................................  
Receivables from collaborations.......................................................................................  
Prepaid expenses and other current assets ........................................................................  
Total current assets......................................................................................................  
Other assets ............................................................................................................................  
Restricted cash........................................................................................................................  
Property and equipment, net...................................................................................................  
Operating lease right-of-use asset ..........................................................................................  

Total assets ..........................................................................................................................   $

Liabilities and Stockholders’ Equity
Current liabilities:

Accounts payable..............................................................................................................   $
Accrued and other liabilities .............................................................................................  
Total current liabilities ................................................................................................  
Noncurrent operating lease liability .......................................................................................  
Deferred rent ..........................................................................................................................  
Total liabilities.....................................................................................................................  

Commitments and contingencies (Note 5)
Stockholders’ equity:

December 31,

2019

2018

60,437    $
96,924   
482   
1,953   
159,796   
280   
440   
992   
7,260   
168,768    $

2,052    $
17,572   
19,624   
6,718   
—   
26,342   

51,058 
85,095 
1,997 
2,102 
140,252 
569 
440 
1,464 
— 
142,725 

1,247 
13,634 
14,881 
— 
1,130 
16,011 

Preferred stock, $0.0001 par value, 10,000 shares authorized as of December 31, 2019
   and 2018; no shares issued and outstanding as of December 31, 2019 and 2018 .........  
Common stock, $0.0001 par value, 200,000 shares authorized as of December 31,
   2019 and 2018; 63,514 and 38,834 shares issued and outstanding as of
   December 31, 2019 and 2018, respectively...................................................................  
Additional paid-in capital .................................................................................................  
Accumulated deficit..........................................................................................................  
Accumulated other comprehensive income (loss) ............................................................  
Total stockholders’ equity ...........................................................................................  

Total liabilities and stockholders’ equity ...............................................................................   $

—   

— 

6   
428,479   
(286,101)  
42   
142,426   
168,768    $

4 
322,993 
(196,170)
(113)
126,714 
142,725  

See accompanying notes.

59

 
 
 
 
 
 
   
 
 
   
   
   
 
 
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
Calithera Biosciences, Inc.
Consolidated Statements of Operations
(in thousands, except per share amounts) 

Revenue:

Collaboration revenue ................................................................   $
Total revenue ........................................................................  

Operating expenses:

Research and development .........................................................  
General and administrative.........................................................  
Total operating expenses.......................................................  
Loss from operations........................................................................  
Interest and other income, net..........................................................  
Net loss.............................................................................................   $
Net loss per share, basic and diluted................................................   $
Weighted average common shares used to compute net
   loss per share, basic and diluted....................................................  

2019

Year Ended December 31,
2018

2017

—    $
—   

76,290   
16,605   
92,895   
(92,895)  
3,035   
(89,860)   $
(1.90)   $

22,254    $
22,254   

66,195   
13,340   
79,535   
(57,281)  
2,652   
(54,629)   $
(1.49)   $

47,312   

36,604   

25,955 
25,955 

43,111 
12,530 
55,641 
(29,686)
1,860 
(27,826)
(0.84)

32,951  

See accompanying notes.

60

 
 
 
 
 
   
   
 
 
   
   
   
   
   
 
 
 
 
 
 
    
 
    
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Calithera Biosciences, Inc.
Consolidated Statements of Comprehensive Loss
(in thousands) 

Net loss................................................................................................................ $
Other comprehensive income (loss):

2019

Year Ended December 31,
2018

2017

(89,860)

 $

(54,629)

 $

(27,826)

Net unrealized gain (loss) on available-for-sale securities............................
Total comprehensive loss.................................................................................... $

155 
(89,705)

 $

157 
(54,472)

 $

(257)
(28,083)

See accompanying notes.

61

 
 
 
 
 
 
 
 
 
  
  
  
  
  
 
  
  
Calithera Biosciences, Inc.
Consolidated Statements of Stockholders’ Equity
(in thousands, except per share amounts) 

Common Stock

Shares

  Amount

Additional
Paid-In
Capital

Accumulated
Deficit

Accumulated
Other
Comprehensive
Income (Loss)  

Total
Stockholders'
Equity

Balance at December 31, 2016....................................   

21,502    $

2    $ 172,419    $ (122,502)   $

(13)   $

49,906 

Issuance of common stock in connection with
   at-the-market offering, net of underwriting
   commissions and issuance costs ..........................   
Issuance of common stock in connection with
   public offering, net of underwriting
   commissions and issuance costs ..........................   
Issuance of common stock in connection with
   Incyte Stock Purchase Agreement,
   net of issuance costs .............................................   
Exercise of stock options ........................................   
Issuance of common stock per ESPP purchase.......   
Stock-based compensation expense ........................   
Cumulative-effect adjustment from adoption
   of accounting standard on stock-based
   compensation .......................................................   
Net loss....................................................................   
Unrealized loss on available-for-sale securities......   
Balance at December 31, 2017....................................   

Issuance of common stock in connection with
   at-the-market offering, net of underwriting
   commissions and issuance costs ..........................   
Exercise of stock options ........................................   
Issuance of common stock per ESPP purchase.......   
Stock-based compensation expense ........................   
Cumulative-effect adjustment from adoption
   of ASC 606 accounting standard on revenue
   recognition ...........................................................   
Net loss....................................................................   
Unrealized gain on available-for-sale securities .....   
Balance at December 31, 2018....................................   

Issuance of common stock in connection
   with public offering, net of underwriting
   commissions and issuance costs ..........................   
Issuance of common stock in connection with
   at-the-market offerings, net of underwriting
   commissions and issuance costs ..........................   
Exercise of stock options ........................................   
Issuance of common stock per ESPP purchase.......   
Stock-based compensation expense ........................   
Cumulative-effect adjustment from adoption
   of ASU 2018-07 accounting standard on stock
   compensation .......................................................   
Net loss....................................................................   
Unrealized gain on available-for-sale securities .....   
Balance at December 31, 2019....................................   

4,351     

1     

38,314     

—     

—     

38,315 

7,855     

1     

75,385     

—     

—     

75,386 

1,720     
153     
178     
—     

—     
—     
—     
35,759     

2,731     
125     
219     
—     

—     
—     
—     
38,834     

—     
—     
—     
—     

7,914     
787     
546     
5,541     

—     
—     
—     
—     

—     
—     
—     
—     

7,914 
787 
546 
5,541 

—     
—     
—     
—     
—     
—     
4      300,906     

(5)    
(27,826)    
—     
(150,333)    

—     
—     
(257)    
(270)    

(5)
(27,826)
(257)
150,307 

—     
—     
—     
—     

13,729     
247     
674     
7,437     

—     
—     
—     
—     

—     
—     
—     
—     

13,729 
247 
674 
7,437 

—     
—     
—     
—     
—     
—     
4      322,993     

8,792     
(54,629)    
—     
(196,170)    

—     
—     
157     
(113)    

8,792 
(54,629)
157 
126,714 

14,375     

1     

53,760     

—     

—     

53,761 

9,929     
191     
185     
—     

1     
—     
—     
—     

43,967     
490     
732     
6,466     

—     
—     
—     
—     

—     
—     
—     
—     

43,968 
490 
732 
6,466 

—     
—     
—     
63,514    $

(71)    
—     
(89,860)    
—     
—     
—     
6    $ 428,479    $ (286,101)   $

71     
—     
—     

—     
—     
155     
42    $

— 
(89,860)
155 
142,426  

See accompanying notes.

62

 
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
Calithera Biosciences, Inc.
Consolidated Statements of Cash Flows 
(in thousands) 

2019

Year Ended December 31,
2018

2017

(89,860)

 $

(54,629)

 $

(27,826)

Cash Flows (Used in) Provided by Operating Activities
Net loss...............................................................................................................  $
Adjustments to reconcile net loss to net cash (used in) provided by operating
   activities:

Depreciation..................................................................................................   
Amortization of premiums (discounts) on investments................................   
Stock-based compensation............................................................................   
Loss on disposal of property and equipment ................................................   
Non-cash lease expense ................................................................................   

Changes in operating assets and liabilities:

Receivables from collaborations...................................................................   
Prepaid expenses and other current assets ....................................................   
Other assets ...................................................................................................   
Accounts payable..........................................................................................   
Accrued liabilities .........................................................................................   
Lease liability................................................................................................   
Deferred revenue...........................................................................................   
Deferred rent, non-current ............................................................................   
Net cash (used in) provided by operating activities............................   

479 
(897)
6,466 
— 
1,366 

1,515 
(26)
289 
816 
2,576 
(1,469)
— 
— 
(78,745)

505 
(272)
7,437 
— 
— 

(855)    
630 
(341)
175 
4,725 
— 
(22,254)    
37 
(64,842)

Cash Flows (Used in) Provided by Investing Activities

Purchases of investments ..............................................................................   
Proceeds from the sale and maturity of investments ....................................   
Purchase of property and equipment ............................................................   
Net cash (used in) provided by investing activities.............................   

(153,227)
142,450 
(7)
(10,784)

(76,107)
129,120 
(214)
52,799 

Cash Flows Provided by Financing Activities

Proceeds from issuance of common stock upon public offering, net ...........   
Proceeds from issuance of common stock under stock purchase
   agreement, net............................................................................................   
Proceeds from issuance of common stock through at-the-market
   offerings, net ..............................................................................................   
Proceeds from stock option exercises and employee stock plan
   purchases....................................................................................................   
Net cash provided by financing activities............................................   

Net increase in cash, cash equivalents, and restricted cash................................   
Cash, cash equivalents, and restricted cash at beginning of period ...................   
Cash, cash equivalents, and restricted cash at end of period..............................  $

53,760 

— 

43,926 

1,222 
98,908 

9,379 
51,498 
60,877 

 $

—     

—     

13,705 

921 
14,626 

2,583 
48,915 
51,498 

 $

365 
446 
5,536 
9 
— 

(1,142)
(952)
62 
674 
4,878 
— 
31,045 
656 
13,751 

(194,650)
97,448 
(1,229)
(98,431)

75,386 

7,914 

38,315 

1,333 
122,948 

38,268 
10,647 
48,915 

Supplemental Disclosure of Non-Cash Financing Information:
Unpaid amounts related to deferred financing costs ..........................................  $

68 

 $

25 

 $

—  

See accompanying notes.

63

 
 
 
 
 
 
 
 
 
 
 
     
       
       
 
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
   
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
 
   
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
 
   
  
  
  
  
  
  
  
  
  
 
   
  
  
  
  
  
   
  
  
  
  
  
Calithera Biosciences, Inc.
Notes to Consolidated Financial Statements

1. Organization and Basis of Presentation

Organization

Calithera Biosciences, Inc., or the Company, was incorporated in the State of Delaware on March 9, 2010. The Company is a 

clinical-stage biopharmaceutical company focused on discovering and developing small molecule drugs that target novel and critical 
metabolic pathways in tumor and cancer-fighting immune cells. The Company’s principal operations are based in South San 
Francisco, California, and it operates in one segment. 

Presentation

The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, Calithera 
Biosciences UK Limited and Calithera Biosciences Ireland Limited. All significant intercompany accounts and transactions have been 
eliminated from the consolidated financial statements.

Liquidity 

In the course of its development activities, the Company has sustained operating losses and expects such losses to continue over 

the next several years. The Company’s ultimate success depends on the outcome of its research and development activities. The 
Company has incurred net losses from operations since inception and has an accumulated deficit of $286.1 million as of December 31, 
2019. The Company intends to raise additional capital through the issuance of additional equity, and potentially through strategic 
alliances with partner companies. However, if such financing is not available at adequate levels, the Company will need to reevaluate 
its operating plans. Management believes that the currently available resources will provide sufficient funds to enable the Company to 
meet its operating plan for at least the twelve-month period following the filing of the Company’s 2019 consolidated financial 
statements included in the Annual Report on Form 10-K. However, if the Company’s anticipated operating results are not achieved in 
future periods, management believes that planned expenditures may need to be reduced in order to extend the time period over which 
the then-available resources would be able to fund the Company’s operations.

2. Summary of Significant Accounting Policies

Use of Estimates

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting 

principles, or GAAP. The preparation of consolidated financial statements in conformity with GAAP requires management to make 
estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as 
of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. On 
an ongoing basis, management evaluates its estimates, including those related to clinical trial accrued liabilities, revenue recognition, 
fair value of marketable securities, income taxes, and stock-based compensation. Management bases its estimates on historical 
experience and on various other market specific and relevant assumptions that management believes to be reasonable under the 
circumstances. Actual results could differ from those estimates.

Cash and Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to 
be cash equivalents. Cash equivalents, which consist primarily of amounts invested in money market accounts, are stated at fair value.

Investments

All investments have been classified as “available-for-sale” and are carried at estimated fair value as determined based upon 

quoted market prices or pricing models for similar securities. Management determines the appropriate classification of its investments 
at the time of purchase and reevaluates such designation as of each balance sheet date. Unrealized gains and losses are excluded from 
earnings and are reported as a component of comprehensive loss. Realized gains and losses and declines in fair value judged to be 
other than temporary, if any, on available-for-sale securities are included in interest and other income, net. The cost of securities sold 
is based on the specific-identification method. Interest on marketable securities is included in interest and other income, net.

64

Receivables from Collaborations

Receivables from collaborations represent amounts due under the terms of the Company’s collaboration agreements, primarily 

its collaboration agreement with Incyte Corporation, or Incyte, as described in Note 11, Collaboration and Licensing Agreements - 
Incyte Collaboration and License Agreement, for reimbursements of certain costs. Based on its evaluation of credit worthiness and 
historical payment patterns, the Company did not record any allowance for doubtful accounts as of December 31, 2019 and 2018.

Restricted Cash

Restricted cash consists of money market funds held by the Company’s financial institution as collateral for the Company’s 

obligations under its facility lease for the Company’s corporate headquarters in South San Francisco, California.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to a concentration of credit risk consist of cash, cash equivalents, 
investments and restricted cash. The Company invests in a variety of financial instruments and, by its policy, limits these financial 
instruments to high credit quality securities issued by the U.S. government, U.S. government-sponsored agencies and highly rated 
banks and corporations, subject to certain concentration limits. The Company’s cash, cash equivalents, investments and restricted cash 
are held by financial institutions in the United States that management believes are of high credit quality. Amounts on deposit may at 
times exceed federally insured limits.

All of the Company’s collaboration revenue and the majority of the Company’s receivables from collaborations are derived 
from its collaboration and license agreement with Incyte Corporation, or Incyte, as described in Note 11, Collaboration and Licensing 
Agreements - Incyte Collaboration and License Agreement. 

Property and Equipment

Property and equipment are stated at cost, less accumulated depreciation. Depreciation is computed using the straight-line 

method over the estimated useful lives of the respective assets. 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 is removed from the balance sheet and the resulting gain or loss is reflected in operations.

The useful lives of property and equipment are as follows:

Research and development equipment
Furniture and office equipment
Computer equipment
Software
Leasehold improvements

5 years
5 years
3 years
3 years
Shorter of remaining lease term or estimated useful life

Impairment of Long-Lived Assets

The Company evaluates its long-lived assets, including property and equipment, for impairment whenever events or changes in 

circumstances indicate that the carrying value of these assets may not be recoverable. Recoverability of these assets is measured by 
comparison of the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate over its 
remaining life. If the asset is considered to be impaired, the amount of any impairment is measured as the difference between the 
carrying value and the fair value of the impaired asset. The Company has not recorded impairment of any long-lived assets during any 
of the periods presented.

Revenue Recognition

The Company records revenue in accordance with Accounting Standards Codification, or ASC No. 2014-09, Revenue from 
Contracts with Customers (Topic 606), or ASC 606.  Under ASC 606, an entity recognizes revenue when its customer obtains control 
of promised goods or services, in an amount that reflects the consideration that the entity expects to receive in exchange for those 
goods or services. To determine revenue recognition for arrangements that an entity determines are within the scope of ASC 606, the 
entity performs the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the 
contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) 
recognize revenue when (or as) the entity satisfies a performance obligation. The Company only applies the five-step model to 
contracts when it is probable that the entity will collect the consideration it is entitled to in exchange for the goods or services it 
transfers to the customer. At contract inception, once the contract is determined to be within the scope of ASC 606, the Company 
assesses the goods or services promised within each contract and determines those that are performance obligations, and assesses 
whether each promised good or service is distinct. The Company then recognizes as revenue the amount of the transaction price that is 
allocated to the respective performance obligation when (or as) the performance obligation is satisfied.

65

 
The Company has a collaboration and license agreement with Incyte, or the Incyte Collaboration Agreement, that is within the 

scope of ASC 606, under which it licenses certain rights to one of its product candidates to Incyte Corporation. The terms of this 
arrangement include payment to the Company of a non-refundable, upfront license fee, and potential development, regulatory and 
sales milestones, and sales royalties. Each of these payments results in collaboration revenues, except for revenues from royalties on 
net sales of licensed products, which would be classified as royalty revenues.

In determining the appropriate amount of revenue to be recognized as it fulfills its obligations under its agreement, the Company 

performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the 
promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) 
measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the 
performance obligations; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation. As part of 
the accounting for these arrangements, the Company must develop assumptions that require judgment to determine the stand-alone 
selling price for each performance obligation identified in the contract. 

Licenses of Intellectual Property:  If the license to the Company’s intellectual property is determined to be distinct from the 
other performance obligations identified in the arrangement, the Company recognizes revenues from non-refundable, upfront fees 
allocated to the license when the license is transferred to the licensee and the licensee is able to use and benefit from the license. For 
licenses that are bundled with other promised goods or services, the Company utilizes judgment to assess the nature of the combined 
performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if 
over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees. The 
Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related 
revenue recognition.

Milestone Payments:  At the inception of each arrangement that includes development, regulatory or commercial milestone 

payments, the Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be 
included in the transaction price. If it is probable that a significant reversal of cumulative revenue would not occur, the associated 
milestone value is included in the transaction price. Milestone payments that are not within the control of the Company or the licensee, 
such as regulatory approvals, are not considered probable of being achieved until those approvals are received or the underlying 
activity has been completed. The transaction price is then allocated to each performance obligation on a relative stand-alone selling 
price basis, for which the Company recognizes revenue as or when the performance obligations under the contract are satisfied. At the 
end of each subsequent reporting period, the Company re-evaluates the probability of achievement of such development milestones 
and any related constraint, and if necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on 
a cumulative catch-up basis, which would affect collaboration revenue in the period of adjustment. 

Royalties:  For arrangements that include sales-based royalties, including milestone payments based on the level of sales, and 

the license is deemed to be the predominant item to which the royalties relate, the Company recognizes revenue at the later of (i) when 
the related sales occur, or (ii) when the performance obligation to which some or all of the royalty that has been allocated has been 
satisfied (or partially satisfied). To date, the Company has not recognized any royalty revenue resulting from any of its licensing 
arrangements.

Contract Balances 

Upfront payments and fees are recorded as deferred revenue upon receipt or when due, and may require deferral of revenue 
recognition to a future period until the Company performs its obligations under these arrangements. Amounts payable to the Company 
are recorded as accounts receivable when the Company’s right to consideration is unconditional.

The Company does not assess whether a contract has a significant financing component if the expectation at contract inception 

is such that the period between payment by the licensees and the transfer of the promised goods or services to the licensees will be one 
year or less.

The following table presents changes in the Company’s contract liabilities for the year ended December 31, 2018 (in thousands):

Year Ended December 31, 2018

Balance at
Beginning of
Period

Balance at
End of
Period

Deferred revenue.................................................................................   $
Deferred revenue, less current portion................................................  

29,017    $
2,028   

— 
—  

66

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred revenue related to the Incyte Collaboration Agreement, which was comprised of the $57 million transaction price 

including a $45 million upfront license payment and a $12 million development milestone achieved, less the collaboration revenue 
recognized from the effective date of the contract, was recognized as the combined performance obligation was satisfied.

The Company had no contract assets during the years ended December 31, 2019 and 2018. The Company had no contract 

liabilities during the year ended December 31, 2019. During the year ended December 31, 2018, the Company’s contract liabilities, 
which consisted of deferred revenue, decreased $31.0 million related to revenue recognized in the period related to amounts included 
in the contract liability at the beginning of the period. In addition, the Company recorded a cumulative adjustment to decrease 
accumulated deficit and deferred revenue by $8.8 million upon the adoption of ASC 606 on January 1, 2018, using the modified 
retrospective approach. For the years ended December 31, 2019 and 2018, the Company did not recognize any revenue from 
performance obligations satisfied in previous periods.

Accrued Research and Development Costs

The Company records accrued liabilities for estimated costs of research and development activities conducted by third-party 

service providers, which include the conduct of preclinical and clinical studies, and contract manufacturing activities. The Company 
records the estimated costs of research and development activities based upon the estimated amount of services provided but not yet 
invoiced, and includes these costs in accrued and other liabilities in the consolidated balance sheets and within research and 
development expense in the consolidated statements of operations. These costs are a significant component of the Company’s research 
and development expenses. The Company accrues for these costs based on factors such as estimates of the work completed and in 
accordance with agreements established with its third-party service providers under the service agreements. The Company makes 
significant judgments and estimates in determining the accrued liabilities balance in each reporting period. As actual costs become 
known, the Company adjusts its accrued liabilities. The Company has not experienced any material differences between accrued costs 
and actual costs incurred. However, the status and timing of actual services performed, number of patients enrolled, and the rate of 
patient enrollments may vary from the Company’s estimates, resulting in adjustments to expense in future periods. Changes in these 
estimates that result in material changes to the Company’s accruals could materially affect the Company’s results of operations. 

Research and Development Costs

Research and development costs are expensed as incurred and consist of salaries and benefits, stock-based compensation 
expense, laboratory supplies, manufacturing costs, and allocated facility costs, as well as fees paid to third parties that conduct certain 
research and development activities on the Company’s behalf. Costs associated with development activities performed under the 
collaboration agreements are included in research and development expenses, with any reimbursement of costs reflected as a reduction 
of such expenses. Nonrefundable advance payments for goods or services to be rendered in the future for use in research and 
development activities are deferred and capitalized. The capitalized amounts are expensed as the related goods are delivered or the 
services are performed.

Deferred Rent

Rent expense is recognized on a straight-line basis over the noncancelable term of the Company’s operating lease. Prior to the 
adoption of ASU NO. 2016-02, Leases (Topic 842), or ASU 842, the Company recorded the difference between cash rent payments 
and the recognition of rent expense as a deferred rent liability. Incentives granted under the Company’s facility leases, including 
allowances to fund leasehold improvements, are deferred and are recognized as adjustments to rental expense on a straight-line basis 
over the term of the lease.

Leases

Effective January 1, 2019, the Company adopted ASU No. 2016-02, Leases (Topic 842), or ASU 842. Operating lease right-of-

use, or ROU, assets and lease liabilities are recognized at commencement and are recorded for leases with durations greater than 12 
months. 

ROU assets represent the Company’s right to use an underlying asset during the lease term, and lease liabilities represent the 
Company’s obligation to make lease payments arising from the lease. The Company’s lease terms may include options to extend or 
terminate the lease when it is reasonably certain that it will exercise that option. Operating lease ROU assets and liabilities are 
recognized at commencement date based on the present value of lease payments over the lease term. The Company estimates an 
incremental borrowing rate based on the information available at commencement date, in determining the present value of lease 
payments. The operating lease ROU asset also includes lease incentives. The Company elected to not separate lease components and 
non-lease components for its long-term facility lease. Variable lease payments include lease operating expenses.

67

Stock-Based Compensation

Stock-based awards issued to employees, non-employee directors of the board, and non-employees, including stock options and 

stock purchased under the employee stock purchase plan, are recorded at fair value as of the grant date using the Black-Scholes 
option-pricing model and recognized as expense on a ratable basis over the employee or director’s requisite service period (generally 
the vesting period). 

Because stock compensation expense is based on awards ultimately expected to vest, it is reduced by forfeitures. The Company 

has elected to account for forfeitures as they occur. 

Income Taxes

The Company uses the 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. The Company must then assess 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. Since realization of the Company’s deferred tax assets is dependent 
upon the Company generating future taxable income, the timing and amount of which are uncertain, the net deferred tax assets have 
been fully offset by a valuation allowance.

The Company recognizes benefits of uncertain tax positions if it is more likely than not that such positions will be sustained 
upon examination based solely on their technical merits, as the largest amount of benefit that is more likely than not to be realized 
upon the ultimate settlement. The Company’s policy is to recognize interest and penalties related to the underpayment of income taxes 
as a component of income tax expense or benefit. To date, there have been no interest or penalties charged in relation to the 
unrecognized tax benefits.

Net Loss per Share

Basic net loss per share is calculated by dividing the net loss by the weighted average number of shares of common stock 
outstanding during the period without consideration of common stock equivalents. Since the Company was in a loss position for all 
periods presented, basic net loss per share is the same as diluted net loss per share for all periods as the inclusion of all potential 
common shares outstanding would have been anti-dilutive.  

Recent Accounting Pronouncements 

Recently Adopted Accounting Guidance

In 2016, the Financial Accounting Standards Board, or FASB, issued ASU 842, which is aimed at making leasing activities 

more transparent, and requires substantially all leases be recognized by lessees on their balance sheet as a right-of-use asset and 
corresponding lease liability. The ASU was previously required to be applied with a modified retrospective approach to each prior 
reporting period presented. In July 2018, the FASB issued ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, or ASU 
No. 2018-11. In issuing ASU No. 2018-11, the FASB is permitting another transition method for ASU 2016-02, which allows the 
transition to the new lease standard by recognizing a cumulative-effect adjustment to the opening balance of retained earnings in the 
period of adoption. The Company adopted the ASU on January 1, 2019, using a modified retrospective approach, and elected the 
transition method, which allowed the Company to record a cumulative adjustment to its accumulated deficit upon adoption. The 
consolidated financial statements for the year ended December 31, 2019, are presented under the new standard, while previous periods 
are not adjusted and continue to be reported in accordance with the Company’s historical accounting policy. The Company elected the 
practical expedients upon transition to not reassess prior conclusions related to contracts containing leases, lease classification and 
initial direct costs. The Company also elected the practical expedient for lessees to combine lease and non-lease components for all 
asset classes, and elected the practical expedient to use hindsight in determining the lease term and in assessing impairment of the 
Company’s right-of-use assets. Upon adoption, the Company recognized in the consolidated balance sheet an operating lease right-of-
use asset and lease liability of approximately $8.6 million and $9.7 million, respectively, and eliminated the previously recorded 
deferred rent of $1.2 million, related to its facility lease. There was no impact to accumulated deficit upon adoption. Refer to Note 5, 
Commitments and Contingencies, Facilities Lease, for more information.

68

In June 2018, the FASB issued ASU No. 2018-07, Compensation – Stock Compensation (Topic 718): Improvements to 
Nonemployee Share-Based Payment Accounting, or ASU 2018-07. The ASU expands the scope of Topic 718 to include share-based 
payment transactions for acquiring goods and services from non-employees. The ASU also clarifies that Topic 718 does not apply to 
share-based payments used to effectively provide (1) financing to the issuer or (2) awards granted in conjunction with selling goods or 
services to customers as part of a contract accounted for under Revenue from Contracts with Customers (Topic 606). The Company 
adopted the ASU on January 1, 2019. Upon adoption, the Company recorded a cumulative-effect adjustment of $71,000 to 
accumulated deficit in the consolidated statement of stockholders’ equity.

In August 2018, the SEC adopted amendments to certain disclosure requirements in Securities Act Release No. 33-10532, 

Disclosure Update and Simplification. These amendments eliminate, modify, or integrate into other SEC requirements certain 
disclosure rules. Among the amendments is the requirement to present an analysis of changes in stockholders’ equity in the interim 
financial statements included in quarterly reports on Form 10-Q. The analysis, which can be presented as a footnote or separate 
statement, is required for the current and comparative quarter and year-to-date interim periods. The amendments are effective for all 
filings made on or after November 5, 2018. The Company adopted this new guidance and included this information in its condensed 
consolidated statements of stockholders’ equity in its 2019 Quarterly Reports on Form 10-Q.

Accounting Guidance Not Yet Adopted 

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit 
Losses on Financial Instruments, or ASU 2016-13. The updated accounting guidance requires changes to the recognition of credit 
losses on financial instruments not accounted for at fair value through net income. In May 2019, the FASB issued ASU No. 2019-
05, Targeted Transition Relief, which provides transition guidance to entities that elect the fair value option for eligible instruments. In 
November 2019, the FASB issued ASU 2019-10 which extends the effective date of the standards for smaller reporting companies to 
interim and annual periods beginning after December 15, 2022. These standards require using a modified retrospective approach with 
the cumulative effect recognized as an adjustment to retained earnings. A prospective transition approach is required for debt 
securities that have recognized an other-than-temporary impairment prior to the effective date. For the Company’s receivables from 
collaborations and certain other financial instruments, the Company will be required to use a forward-looking “expected” credit loss 
model instead of the existing “incurred” credit loss model, which will generally result in earlier recognition of allowances for credit 
losses. The Company plans to adopt this standard effective January 1, 2023. The Company is currently evaluating the effect the 
guidance will have on its financial statements or disclosures.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the 
Disclosure Requirements for Fair Value Measurement, which modifies the disclosure requirements on fair value measurements. This 
guidance is effective for fiscal years beginning after December 15, 2019, and interim periods therein. Early adoption is permitted. The 
adoption of this guidance is not expected to have a significant impact on the Company’s disclosures.

In November 2018, the FASB issued ASU 2018-18—Collaborative Arrangements (Topic 808): Clarifying the Interaction 
between Topic 808 and Topic 606, or ASU 2018-18. This standard provides guidance on the interaction between Revenue Recognition 
(Topic 606) and Collaborative Arrangements (Topic 808) by aligning the unit of account guidance between the two topics and 
clarifying whether certain transactions between collaborative participants should be accounted for as revenue under Topic 606. ASU 
2018-18 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. The adoption of 
this guidance is not expected to have a significant impact on the Company’s financial statements and related disclosures. 

3. Fair Value Measurements

Fair value accounting is applied for all financial assets and liabilities that are recognized or disclosed at fair value in the 
consolidated financial statements on a recurring basis (at least annually). Financial instruments include cash and cash equivalents, 
short-term investments, receivables from collaborations, accounts payable, accrued liabilities and the current portion of deferred 
revenue that approximate fair value due to their relatively short maturities. 

Assets and liabilities recorded at fair value on a recurring basis in the consolidated balance sheets are categorized based upon the 

level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the exchange price that would 
be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the 
asset or liability in an orderly transaction between market participants on the measurement date. The authoritative guidance on fair 
value measurements establishes a three tier fair value hierarchy for disclosure of fair value measurements as follows: 

Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date; 

69

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. 

A financial instrument’s categorization within the valuation hierarchy is based upon the lowest level of input that is significant 

to the fair value measurement. Where quoted prices are available in an active market, securities are classified as Level 1. The 
Company classifies money market funds as Level 1. When quoted market prices are not available for the specific security, then the 
Company estimates fair value by using quoted prices for identical or similar instruments in markets that are not active and model-
based valuation techniques for which all significant inputs are observable in the market or can be corroborated by observable market 
data for substantially the full term of the assets. Where applicable, these models project future cash flows and discount the future 
amounts to a present value using market-based observable inputs obtained from various third party data providers, including but not 
limited to, benchmark yields, interest rate curves, reported trades, broker/dealer quotes and market reference data. The Company 
classifies its corporate notes and commercial paper, U.S. treasury securities, and U.S. government agency securities as Level 2. Level 
2 inputs for the valuations are limited to quoted prices for similar assets or liabilities in active markets and inputs other than quoted 
prices that are observable for the asset or liability. There were no transfers between Level 1 and Level 2 during the periods presented.

The following table sets forth the fair value of the Company’s financial assets and liabilities, allocated into Level 1, Level 2 and 

Level 3, that was measured on a recurring basis (in thousands):

Level 1

Level 2

Level 3

Total

December 31, 2019

Financial Assets:

Money market funds ............................................  $
Corporate notes and commercial paper ............... 
U.S. treasury securities ........................................ 
U.S. government agency securities...................... 
Total financial assets............................................  $

45,743    $
—     
—     
—     
45,743    $

—    $
55,770     
38,739     
16,603     
111,112    $

—    $
—     
—     
—     
—    $

45,743 
55,770 
38,739 
16,603 
156,855 

Level 1

Level 2

Level 3

Total

December 31, 2018

Financial Assets:

Money market funds ............................................  $
Corporate notes and commercial paper ............... 
U.S. treasury securities ........................................ 
U.S. government agency securities...................... 
Total financial assets............................................  $

14,077    $
—     
—     
—     
14,077    $

—    $

73,733 
20,334 
28,072 
122,139    $

—    $
— 
— 
— 
—    $

14,077 
73,733 
20,334 
28,072 
136,216 

70

 
 
 
 
 
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
       
       
       
 
 
 
 
 
 
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
  
  
 
  
  
 
 
   
       
       
       
 
4. Balance Sheet Components

Financial Instruments 

Cash equivalents and investments, all of which are classified as available-for-sale securities, and restricted cash consisted of the 

following (in thousands):

Cost

December 31, 2019

Unrealized
Gain

Unrealized
(Loss)

 $

—  $

—   $

Estimated
Fair Value  
45,743 

Cost
  $ 14,077 

December 31, 2018

Unrealized
Gain

Unrealized
(Loss)

 $

—  $

Estimated
Fair Value  
—   $ 14,077 

55,770 
38,739 
16,603 
156,855  

  73,769 
    20,334 
     28,149  
 $136,329   $

— 

4    
—    
4  $

(36)
(4)   
(77)   

73,733 
20,334 
28,072 
(117) $ 136,216 

Money market funds............................. $ 45,743 
Corporate notes and commercial
   paper ..................................................
U.S. treasury securities .........................
U.S. government agency securities.......

  55,761 
  38,710 
  16,599  
$156,813   $

Classified as:

Cash equivalents...........................
Short-term investments.................
Restricted cash..............................

Total cash equivalents,
   restricted cash and
   investments .............................

13 
29    
4    
46  $

(4)
—    
—    
(4) $

   $

59,491  
96,924 
440  

$

156,855 

   $ 50,681 
85,095 
440 

$ 136,216 

At December 31, 2019, the remaining contractual maturities of available-for-sale securities were less than one year. There have 

been no significant realized gains or losses on available-for-sale securities for the periods presented. As of December 31, 2019, 
unrealized losses on cash equivalents and investments were insignificant. The gross unrealized loss that had been in a continuous loss 
position for 12 months or longer was $0 and $59,000 as of December 31, 2019 and 2018, respectively. The Company does not intend 
to sell its securities that are in an unrealized loss position, and it is unlikely that the Company will be required to sell its securities 
before recovery of their amortized cost basis, which may be maturity. Factors considered in determining whether a loss is temporary 
include the length of time and extent to which the fair value has been less than the amortized cost basis and whether the Company 
intends to sell the security or whether it is more likely than not that the Company would be required to sell the security before 
recovery of the amortized cost basis. As of December 31, 2019, the Company had a total of $157.8 million in cash, cash equivalents, 
restricted cash and investments, which included $0.9 million in cash and $156.9 million in cash equivalents, restricted cash and 
investments.

Property and Equipment, Net

Property and equipment, net consist of the following (in thousands):

December 31,

2019

2018

Research and development equipment ...........................................
Furniture and office equipment ......................................................
Computer equipment ......................................................................
Software .........................................................................................
Leasehold improvements................................................................
Total property and equipment ........................................................
Less: accumulated depreciation .....................................................
Property and equipment, net .....................................................

$

$

 $

2,112 
167 
601 
80 
1,234 
4,194 
(3,202)   
 $
992 

2,132 
167 
595 
80 
1,234 
4,208 
(2,744)
1,464  

Property and equipment depreciation expense for the years ended December 31, 2019, 2018, and 2017 was $479,000, $505,000, 

and $365,000, respectively.

71

 
 
 
 
 
 
 
   
   
 
 
 
   
   
 
 
 
 
 
 
  
 
 
 
 
 
 
  
  
 
 
 
 
 
   
   
     
    
 
 
    
 
   
   
     
    
 
 
 
 
   
   
     
   
 
   
   
     
 
 
   
   
     
    
    
 
   
   
     
    
 
 
   
   
     
    
   
 
   
   
     
    
 
 
   
   
     
   
    
 
   
   
     
   
 
   
      
     
      
       
      
     
      
 
 
 
 
 
 
 
 
  
 
  
 
  
 
  
 
  
 
Accrued Liabilities

Accrued liabilities consist of the following (in thousands):

Accrued clinical and manufacturing expenses ................................. $
Accrued payroll and related expenses ..............................................
Collaboration reimbursement advances............................................
Current portion of lease liability.......................................................
Other .................................................................................................

Total accrued liabilities ............................................................... $

8,270 
5,045 
1,547 
1,478 
1,232 
17,572 

 $

 $

6,316 
3,529 
2,467 
— 
1,322 
13,634 

December 31,

2019

2018

5. Commitments and Contingencies 

Facilities Lease

On January 1, 2019, the Company adopted ASU 842, which requires leases with a duration greater than twelve months to be 

recognized on the balance sheet. The Company adopted the standard using the modified retrospective approach with an effective date 
as of the beginning of the Company’s fiscal year, January 1, 2019. Prior period financial information was not recast under the new 
standard, and therefore, those amounts are not presented below. The Company elected the package of transition provisions available 
for expired or existing contracts, which allowed it to carryforward its historical assessments of 1) whether contracts are or contain 
leases, 2) lease classification and 3) initial direct costs. The Company also elected the hindsight practical expedient, and elected to not 
separate lease and non-lease components. 

The Company has a non-cancelable facility lease agreement, or the Lease, for office and laboratory facilities in South San 

Francisco, California, with a remaining lease term of 4.09 years, through January 2024, and a two-year renewal option prior to 
expiration. The renewal option to extend the Lease was not considered in the determination of the right-of-use asset or the lease 
liability for the Lease as the Company did not consider it reasonably certain that it would exercise any such option. The Lease has rent 
escalation clauses through the lease term and provided for tenant improvement allowances up to $499,900, which were fully utilized 
by December 2017 and included in the calculation of the lease liability. The Lease provides that the Company is obligated to pay 
certain variable costs, including taxes and operating expenses. The Lease is classified as an operating lease. The Company has 
measured the present value of its lease liability using an estimated incremental borrowing rate of 9%. In addition, the Company has a 
non-cancelable sublease agreement for a portion of its facilities through February 2020. The sublease agreement provides that the 
subtenant is obligated to pay its share of the variable costs under the Lease.

The components of net operating lease costs included in the consolidated statement of operations for the year December 31, 

2019, were as follows (in thousands):

Lease Costs for the Year Ended December 31, 2019
Straight-line rent expense related to facility operating lease ......................................... 
Variable rent expense related to operating lease ............................................................ 
Sublease income ............................................................................................................. 
Variable sublease income............................................................................................... 
Net operating lease costs ................................................................................................ 

$

$

2,177 
1,327 
(1,115)
(509)
1,880  

Cash paid for amounts included in the measurement of the lease liabilities for the year ended December 31, 2019, was $2.3 
million, respectively, and was included in net cash used in operating activities in the Company’s consolidated statements of cash flows.

72

 
 
 
   
 
 
  
 
  
 
  
 
  
 
 
 
    
 
 
 
   
 
 
 
 
Supplemental balance sheet information related to the Company’s operating lease as of December 31, 2019, was as follows (in 

thousands):

Classification

Assets:

Operating lease right-of-use asset................................................................................ 

Current Liabilities:

Current portion included in accrued and other liabilities ............................................ 

Noncurrent Liabilities:

Noncurrent operating lease liability ............................................................................ 

$

$

$

The maturities of the Company’s lease liability as of December 31, 2019, were as follows (in thousands):

Year ending December 31:
2020................................................................................................................................ 
2021................................................................................................................................ 
2022................................................................................................................................ 
2023................................................................................................................................ 
2024................................................................................................................................ 
Total lease payments ...................................................................................................... 
Less: interest................................................................................................................... 
Present value of lease liability........................................................................................ 

$

$

7,260 

1,478 

6,718  

2,148 
2,413 
2,485 
2,559 
219 
9,824 
(1,628)
8,196  

The Company has an existing letter of credit of $440,000 as a security deposit to the lease. The lessor shall be entitled to draw 

on the letter of credit in the event of any uncured default by the Company under the terms of the lease. 

Expenses and income associated with the Company’s operating leases were as follows (in thousands): 

Rent expense ............................................................  $
Sublease income/gain...............................................   

3,504    $
(1,624)   

3,439    $
(1,566)   

3,445 
(1,277)

2019

Year Ended December 31,
2018

2017

Indemnifications 

The Company indemnifies each of its officers and directors for certain events or occurrences, subject to certain limits, while the 

officer or director is or was serving at the Company’s request in such capacity, as permitted under Delaware law and in accordance 
with its certificate of incorporation and bylaws. The term of the indemnification period lasts as long as an officer or a director may be 
subject to any proceeding arising out of acts or omissions of such officer or director in such capacity. The maximum amount of 
potential future indemnification is unlimited; however, the Company currently holds director and officer liability insurance. This 
insurance allows the transfer of risk associated with the Company’s exposure and may enable it to recover a portion of any future 
amounts paid. The Company believes that the fair value of these indemnification obligations is minimal. Accordingly, it has not 
recognized any liabilities relating to these obligations for any period presented. 

6. Stockholders’ Equity

Public Offering

In March 2017, the Company entered into an underwriting agreement with Leerink Partners LLC, as representative of several 

underwriters named therein (collectively, the “2017 Underwriters”), pursuant to which the Company issued and sold 7,854,500 shares 
of common stock, including 1,024,500 shares sold pursuant to the 2017 Underwriters’ exercise in full of their option to purchase 
additional shares. The price to the public in the offering was $10.25 per share, and the 2017 Underwriters purchased the shares from 
the Company at a price of $9.64 per share. The net proceeds to the Company from this public offering were approximately $75.4 
million, after deducting underwriting discounts and commissions and other offering expenses. 

73

 
   
 
 
   
 
 
   
 
 
   
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
  
In June 2019, the Company entered into an underwriting agreement with SVB Leerink LLC, Wells Fargo Securities, LLC, and 

William Blair & Company, LLC (collectively, the 2019 Underwriters), pursuant to which the Company issued and sold 14,375,000 
shares of common stock, including 1,875,000 shares sold pursuant to the 2019 Underwriters’ exercise in full of their option to 
purchase additional shares. The price to the public in the offering was $4.00 per share, and the 2019 Underwriters purchased the shares 
from the Company at a price of $3.76 per share. The net proceeds to the Company from this public offering were approximately $53.8 
million, after deducting underwriting discounts and commissions and other offering expenses.

Incyte Stock Purchase Agreement

In January 2017, the Company entered into a stock purchase agreement with Incyte, pursuant to which the Company issued and 

sold 1,720,430 shares of common stock, at a price of $4.65 per share to Incyte, resulting in net proceeds of approximately $7.9 
million, after deducting offering expenses. 

At-the-Market Offerings

In November 2015, the Company entered into a sales agreement with Cowen and Company LLC, or Cowen, as sales agent and 

underwriter, pursuant to which the Company could issue and sell shares of its common stock for an aggregate maximum offering price 
of $50.0 million under an at-the-market offering program, or 2015 ATM program. The Company paid Cowen up to 3% of gross 
proceeds for the common stock sold through the sales agreement. As of December 31, 2017, the Company had sold all available 
shares under the 2015 ATM program. 

In August 2017, the Company entered into a sales agreement with Cowen, as sales agent and underwriter, pursuant to which the 
Company could issue and sell shares of its common stock with an aggregate maximum offering price of $50.0 million under an at-the-
market offering program, or ATM program. The Company paid Cowen up to 3% of gross proceeds for any common stock sold 
through the sales agreement. In December 2019, the Company terminated its sales agreement with Cowen and Company LLC. 

In December 2019, the Company entered into a sales agreement with Jefferies LLC, or Jefferies, as sales agent and underwriter, 

pursuant to which the Company could issue and sell shares of its common stock with an aggregate maximum offering price of $50.0 
million under an at-the-market offering program, or the Jefferies ATM program. The Company will pay Jefferies up to 3% of gross 
proceeds for any common stock sold through the sales agreement. 

During the year ended December 31, 2019, the Company sold an aggregate of 9,929,742 shares under its ATM programs at an 

average price of approximately $4.54 per share for gross proceeds of $45.1 million, resulting in net proceeds of $44.0 million after 
underwriting fees and offering expenses. As of December 31, 2019, $7.6 million and $0 million of common stock remained available 
for sale under the Jefferies and Cowen ATM programs, respectively.

7. Equity Incentive Plans

2010 Plan

In 2010, the Company adopted the 2010 Equity Incentive Plan, or the 2010 Plan. Under the 2010 Plan, shares of the Company’s 

common stock have been reserved for the issuance of stock options to employees, directors, and consultants under terms and 
provisions established by the Board of Directors. Under the terms of the 2010 Plan, options were granted at an exercise price not less 
than fair market value. For employees holding more than 10% of the voting rights of all classes of stock, the exercise prices for 
incentive and nonstatutory stock options were not less than 110% of fair market value, as determined by the Board of Directors. The 
terms of options granted under the 2010 Plan did not exceed ten years. The vesting schedule of option grants was typically four years.

The Company granted options under the 2010 Plan until October 2014 when it was terminated as to future awards, although it 

continues to govern the terms of options that remain outstanding under the 2010 Plan. 

As of December 31, 2019, approximately 506,000 shares of common stock are subject to options outstanding under the 2010 

Plan. 

74

2014 Plan

In September 2014, the Company’s Board of Directors and stockholders approved the 2014 Equity Incentive Plan, or the 2014 
Plan, which became effective in October 2014, at which time the 2010 Plan was terminated. The 2014 Plan provides for the grant of 
stock options, other forms of equity compensation, and performance cash awards. The number of shares of common stock reserved for 
issuance under the 2014 Plan will automatically increase on January 1 of each year, beginning on January 1, 2015 and ending on and 
including January 1, 2024, by 4% of the total number of shares of the Company’s capital stock outstanding on December 31 of the 
preceding calendar year, or a lesser number of shares determined by the Company’s Board of Directors. 

As of December 31, 2019, approximately 6.3 million shares of common stock were reserved for issuance under the 2014 Plan 
and there were approximately 128,000 shares of common stock available for future grant. The Company issues new shares upon the 
exercise of options. The maximum term of options granted under the 2014 Plan is ten years. The vesting schedule of option grants are 
typically four years.

2018 Inducement Plan

In January 2018, the Company’s Board of Directors approved the 2018 Inducement Plan, a non-stockholder approved stock plan, 

under which it reserved and authorized up to 1 million shares of the Company’s common stock in order to award nonstatutory options 
and restricted stock unit awards to persons not previously an employee or director of the Company, or following a bona fide period of 
non-employment, as an inducement material to such persons entering into employment with the Company. As of December 31, 2019, 
there were 1 million shares reserved under the 2018 Inducement Plan and there were approximately 920,000 shares of common stock 
available for future grant. The maximum term of options granted under the 2018 Inducement Plan is ten years. The vesting schedule of 
option grants are typically four years.

The following summarizes option activity (in thousands, except price per option data): 

Outstanding — December 31, 2018 .................................. 
Options granted ............................................................ 
Options exercised......................................................... 
Options cancelled......................................................... 
Outstanding — December 31, 2019 .................................. 
Exercisable — December 31, 2019 ................................... 
Vested and expected to vest — December 31, 2019 ......... 

Options Outstanding
Weighted-
Average
Exercise Price
per Option

Number of
Options

4,669    $
2,222    $
(191)  $
(187)  $
6,513    $
3,525    $
6,513    $

7.86    $
4.75   
3.67   
8.91   
6.89    $
7.89    $
6.89    $

Aggregate
Intrinsic
Value

1,108 

5,808 
3,203 
5,808  

The aggregate intrinsic values of options outstanding, exercisable, vested and expected to vest were calculated as the difference 

between the exercise price of the options and the fair value of the Company’s common stock of $5.71 per share as of December 31, 
2019.

The weighted-average fair value per share of employee options granted during the years ended December 31, 2019, 2018, and 

2017 were $3.46, $5.69, and $10.79, respectively. The total fair value of options that vested during the years ended December 31, 
2019, 2018, 2017 was $6.7 million, $5.6 million, and $4.8 million, respectively. The aggregate intrinsic value of options exercised was 
$0.3 million, $0.6 million and $1.3 million for the years ended December 31, 2019, 2018 and 2017, respectively.

As of December 31, 2019, the weighted-average remaining contractual life was 5.97 years and 7.23 years for exercisable options 

and vested and expected to vest options, respectively.

75

 
 
 
 
 
 
   
   
 
 
 
 
  
 
 
  
 
 
  
 
 
 
Stock-Based Compensation Expense

Total stock-based compensation recognized related to the 2010 Plan, 2014 Plan and 2018 Inducement Plan was as follows (in 

thousands):

Research and development ................................................
General and administrative................................................
Total stock-based compensation ..................................

 $

 $

3,223    $
2,886     
6,109    $

3,187    $
3,233     
6,420    $

2,243 
2,511 
4,754  

Year Ended December, 31
2018

2017

2019

As of December 31, 2019, the total unrecognized compensation expense related to unvested options was $10.7 million, which 

the Company expects to recognize over an estimated weighted average period of 2.54 years.

In each of the periods presented, the exercise price per share for each stock option was the same as the fair value of the 

Company’s common stock on the date of grant. 

In determining the fair value of the stock-based awards, the Company uses the Black-Scholes option-pricing model and 

assumptions discussed below. Each of these inputs is subjective and generally requires significant judgment to determine.

Expected Term—The Company’s expected term represents the period that the Company’s stock-based awards are expected to be 

outstanding and is determined using the simplified method (based on the midpoint between the vesting date and the end of the 
contractual term).

Expected Volatility—The expected volatility was estimated based on a weighted volatility using both the Company’s trading 
history for its common stock and the average volatility for comparable publicly traded biopharmaceutical companies over a period 
equal to the expected term of the stock option grants. The comparable companies were chosen based on their similar size, stage in the 
life cycle, or area of specialty.

Risk-Free Interest Rate—The risk-free interest rate is based on the U.S. Treasury zero coupon issues in effect at the time of 

grant for periods corresponding with the expected term of option.

Expected Dividend—The Company has never paid dividends on its common stock and has no plans to pay dividends on its 

common stock. Therefore, the Company used an expected dividend yield of zero.

The fair value of stock option awards was estimated using a Black-Scholes option pricing model with the following assumptions:

Expected term .....................................
Volatility .............................................
Risk-free interest rate ..........................
Expected dividend rate........................ 

2019
5.3 - 6.1 years
84.6% - 85.7%    
1.42% - 2.60%    

Year Ended December 31,
2018
5.3 - 6.1 years
84.4% - 95.7%    
2.40% - 3.10%    

—%

—%

2017
5.3 - 6.1 years
68.9% - 95.0%  
1.80% - 2.27%  

—%

ESPP

In September 2014, the Company’s Board of Directors and stockholders approved the 2014 Employee Stock Purchase Plan, or 

the ESPP, which became effective in October 2014. The number of shares of common stock reserved for issuance under the ESPP will 
increase automatically each year, beginning on January 1, 2015 and continuing through and including January 1, 2024, by the lesser of 
(1) 1% of the total number of shares of common stock outstanding on December 31 of the preceding calendar year; (2) 250,000 shares 
of common stock; or (3) such lesser number as determined by the Company’s Board of Directors. 

76

 
 
 
 
 
 
 
 
 
 
  
 
 
 
   
   
 
   
   
 
    
    
 
The ESPP allows eligible employees to purchase shares of the Company's common stock at a discount through payroll 
deductions of up to 15% of their eligible compensation, subject to certain plan limitations. Through December 9, 2018, the ESPP 
provided for 24-month offering periods with four 6-month purchase periods, and at the end of each purchase period, employees were 
able to purchase shares at 85% of the lower of the fair market value of the Company's common stock on the first trading day of the 
offering period or on the last day of the purchase period. Effective beginning December 10, 2018, the ESPP provides for 6-month 
offering periods and a 6-month purchase period, and at the end of each purchase period, employees are able to purchase shares at 85% 
of the lower of the fair market value of the Company’s common stock on the first trading day of the offering period or on the last day 
of the purchase period. As of December 31, 2019, 763,530 shares of common stock have been issued to employees participating in the 
ESPP and 503,120 shares were available for issuance under the ESPP. The ESPP is a compensatory plan as defined by the 
authoritative guidance for stock compensation. As such stock-based compensation expense has been recorded for the years ended 
December 31, 2019, 2018 and 2017.

Total stock-based compensation expense recognized related to the ESPP was as follows (in thousands):

Research and development..................   $ 
General and administrative .................      
Total stock-based compensation .........   $ 

269    $ 
88       
357    $ 

819    $ 
198       
1,017    $ 

639 
143 
782  

2019

Year Ended December 31,
2018

2017

The Company used the following assumptions to estimate the fair value of stock offered under the ESPP for the years ended 

December 31, 2019, 2018 and 2017:

Expected term..................................
Volatility..........................................
Risk-free interest rate ......................
Expected dividend rate ....................

8. Employee Benefit Plan 

2019
0.24 - 0.50 years
52.9% - 82.0 %    
1.58% - 2.55%    

Year Ended December 31,
2018

2017

    0.24 - 0.86 years

    0.03 - 1.74 years

61.0% - 86.6%    
1.56% - 2.55%    

72.2% - 135.6%  
0.76% - 1.59%  

—%

—%

—%

The Company has an employee benefit plan under Section 401(k) of the Internal Revenue Code. The plan allows employees to 

contribute a portion of their compensation, subject to certain limitations. The Company may make contributions to this plan at its 
discretion. For the year ended December, 31, 2019, the Company matched a portion of the employees’ contributions up to a defined 
maximum, and recognized expense of approximately $0.3 million relating to these contributions. No contributions were made by the 
Company to the plan for the years ended December 31, 2018 and 2017. 

9. Income Taxes

No provision for income taxes was recorded for the years ended December 31, 2019, 2018, and 2017. The Company has 
incurred net operating losses for all the periods presented. The Company has not reflected any benefit of such net operating loss 
carryforwards in the accompanying consolidated financial statements.

The domestic and foreign components of loss before provision for income tax are as follows (in thousands):

Domestic ........................................................................... $
Foreign ..............................................................................
Total .................................................................................. $

(89,860)  $
—     
(89,860)  $

(54,629)  $
—     
(54,629)  $

(27,826)
— 
(27,826)

2019

Year Ended December 31,
2018

2017

77

 
 
 
 
 
   
   
 
 
 
 
   
   
 
 
 
    
    
 
 
 
 
 
 
 
 
 
 
The effective tax rate of the provision for income taxes differs from the federal statutory rate as follows:

Federal statutory income tax rate ......................................  
State income taxes, net of federal benefit .........................  
Federal and state tax credits, net of reserves.....................  
Stock-based compensation ................................................  
Other permanent differences .............................................  
Tax Cuts and Jobs Act Remeasurement of Deferred
   Taxes ..............................................................................
Change in valuation allowance .........................................  

2019

Year Ended December, 31
2018

2017

21.0%   
— 
2.5 
(0.4)    
(0.1)    

—
(23.0)    
0%   

21.0%   

0.7 
4.4 
(1.4)    
(0.1)    

—
(24.6)    
0%   

34.0%
0.5 
5.6 
(1.8)
(2.7)

(63.8)
28.2 

0%

The components of the deferred tax assets and liability are as follows (in thousands):

Deferred tax assets:

Net operating loss carryforwards ........................................................... $
Tax credits, net of reserves ....................................................................
Accrued liabilities ..................................................................................
Stock-based compensation.....................................................................
Operating lease liability .........................................................................
Other.......................................................................................................
     Gross deferred tax assets...................................................................
Valuation allowance...............................................................................
Total deferred tax assets ...................................................................

Deferred tax liability:

Operating lease right-of-use asset ..........................................................
Total deferred tax liability ................................................................

Net deferred tax assets (liability) ............................................. $

Year Ended December 31,
2018
2019

55,531    $
9,514   
1,600   
3,070   
1,721   
279   
71,715 
(70,190) 
1,525   

(1,525) 
(1,525) 

—    $

38,707 
7,220 
1,109 
2,152 
— 
273 
49,461 
(49,461)
— 

— 
— 
— 

Realization of the Company’s deferred tax assets is dependent upon the Company generating future taxable income, the timing 

and amount of which are uncertain. Accordingly, the deferred tax assets have been fully offset by a valuation allowance as of 
December 31, 2019 and 2018. The valuation allowance increased by $20.7 million for the year ended December 31, 2019, and 
increased by $11.3 million for the year ended December 31, 2018. ASC Topic 740 requires that the tax benefit of deductible 
temporary differences of carryforwards be recorded as a deferred tax asset to the extent that management assesses that realization is 
"more likely than not." Future realization of the tax benefit ultimately depends on the existence of sufficient taxable income within the 
carryback or carryforward period available under the tax law. The Company has set up the valuation allowance against the federal and 
state deferred tax assets because based on all available evidence, these deferred tax assets are not more likely than not to be realizable.

As of December 31, 2019 and 2018, the Company had approximately $247.4 million and $167.3 million of federal operating 

loss carryforwards, respectively, and $53.5 million and $53.6 million of state net operating loss carryforwards, respectively, available 
to reduce future taxable income. Of the federal net operating loss carryforwards, $129.3 million will begin to expire in 2030, and 
$118.1 million will carryforward indefinitely, while state net operating losses begin to expire in 2030.

As of December 31, 2019 and 2018, the Company also had research and development tax credit carryforwards of approximately 

$10.7 million and $8.1 million for federal purposes, respectively, and $5.1 million and $4.3 million for state purposes, respectively, 
available to offset future taxable income tax. If not utilized, the federal carryforwards will expire in various amounts beginning in 
2030, and the state credits can be carried forward indefinitely.

78

 
 
 
 
 
 
 
 
   
   
   
   
 
 
   
 
   
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
   
   
   
 
 
 
 
 
 
   
   
   
 
Sections 382 and 383 place a limitation on the amount of taxable income which can be offset by carryforward tax attributes, 
such as net operating losses or tax credits, after a change in control. Generally, after a change in control, a loss corporation cannot 
deduct carryforward tax attributes in excess of the limitation prescribed by Section 382 and 383. Therefore, certain of the Company's 
carryforward tax attributes may be subject to an annual limitation regarding their utilization against taxable income in future periods. 
As a result of the Company's IPO in 2014, the Company triggered an "ownership change" as defined in Internal Revenue Code Section 
382 and related provisions. Additionally, due to stock acquired by investors and reported under Section 13(g), the Company believes 
that an “ownership change” occurred during 2018, as well. The Company believes that some of its net operating losses and credit 
carryforwards may be limited by these ownership changes but that any limitation would not have a significant impact to the financial 
statements since there is no utilization of the net operating losses and credit carryforwards and a full valuation allowance exists against 
the net operating losses and credit carryforwards for U.S. tax purposes. Subsequent ownership changes since 2018 may subject the 
Company to annual limitations of its net operating loss and credit carryforwards. Such annual limitation could result in the expiration 
of the net operating loss and credit carryforwards before utilization.

The Tax Cuts and Jobs Act (Act) was enacted on December 22, 2017 and provides for significant changes to U.S. tax law. 
Among other provisions, the Act reduces the U.S. corporate income tax rate to 21%, effective in 2018. The Act also contains a number 
of provisions that may impact the Company in future years. As a result of the reduction in the corporate rate, the Company determined 
the remeasurement resulted in a reduction in deferred tax assets of $17.8 million as of December 31, 2017, which was fully offset by a 
corresponding change to the Company’s valuation allowance. At December 31, 2017, the Company had not completed its accounting 
for all of the enactment-date income tax effects of the Act for remeasurement of deferred tax assets and liabilities, one-time transition 
tax, and tax on global intangible low-taxed income. During the year ended December 31, 2018, the Company completed its accounting 
for all of the enactment-date income tax effects of the Act. Upon completing the analysis, the Company recognized no material 
adjustments to the provisional amounts recorded for the year ended December 31, 2017. 

The Act also provides for a transition to a new territorial system of taxation and generally requires companies to include certain 

untaxed foreign earnings of non-U.S. subsidiaries into taxable income in 2017, or Transition Tax. As the Company’s foreign 
subsidiaries were dormant, the Company had no Transition Tax.

The Act subjects a U.S. shareholder to current tax on global intangible low-taxed income, or GILTI, earned by certain foreign 
subsidiaries. The FASB Staff Q&A, Topic 740 No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can 
make an accounting policy election to either recognize deferred taxes for temporary differences expected to reverse as GILTI in future 
years or provide for the tax expense related to GILTI in the year the tax is incurred. The Company has elected to recognize the tax on 
GILTI as a period expense in the period the tax is incurred. As a result of no activity in the Company’s dormant foreign subsidiaries, 
the Company has no GILTI inclusion for the year ended 2019 and 2018. 

Uncertain Tax Positions

As of December 31, 2019, the Company’s total unrecognized tax benefit was $6.0 million, of which none of the tax benefit, if 

recognized, would affect the effective income tax rate due to the valuation allowance that currently offsets deferred tax assets.  A 
reconciliation of the Company’s unrecognized tax benefits for the years ended December 31, 2019, 2018, and 2017 is as follows (in 
thousands):

Balance at beginning of year............................................. $
Decreases related to prior year tax positions ...............
Additions based on tax positions related to current
   year ...........................................................................
Balance at end of year ....................................................... $

4,964    $
(6)   

1,035
5,993    $

3,623    $
—   

1,341
4,964    $

2,326 
— 

1,297
3,623 

2019

Year Ended December 31,
2018

2017

The unrecognized tax benefits, if recognized and in absence of full valuation allowance, would increase the Company’s credit 

carryforwards and hence deferred tax assets and have no impact to the effective tax rate. The Company does not expect the 
unrecognized tax benefits to change significantly over the next 12 months.

Interest and penalties are zero, and the Company’s policy is to account for interest and penalties in tax expense on the statement 
of operations and comprehensive loss. The Company files income tax returns in the U.S. federal, California and various other state tax 

79

 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
   
       
   
   
 
jurisdictions. All periods since inception are subject to examination by U.S. federal, California and other state tax jurisdictions, none 
of which are currently under examination.

10. Net Loss per Common Share

Since the Company was in a loss position for all periods presented, diluted net loss per share is the same as basic net loss per 

share for all periods as the inclusion of all potential common shares outstanding would have been anti-dilutive.

Potentially dilutive securities that were not included in the diluted per share calculations because they would be anti-dilutive 

were as follows (in thousands):

Options to purchase common stock ..................................
Employee stock plan purchases ........................................
Total ..................................................................................

2019

6,513 
19 
6,532 

December 31,
2018

4,669 
16 
4,685 

2017

3,571 
59 
3,630  

11. Licensing and Collaboration Agreements

Incyte Collaboration and License Agreement

On January 27, 2017, the Company entered into a collaboration and license agreement with Incyte, or the Incyte Collaboration 
Agreement. Under the terms of the Incyte Collaboration Agreement, the Company granted Incyte an exclusive, worldwide license to 
develop and commercialize its small molecule arginase inhibitors for hematology and oncology indications. The parties are 
collaborating on and co-funding the development of the licensed products, with Incyte bearing 70% and the Company bearing 30% of 
global development costs. The parties will share profits and losses in the United States, with 60% to Incyte and 40% to the Company. 
The Company will have the right to co-detail the licensed products in the United States, and Incyte will pay the Company tiered 
royalties ranging from the low to mid-double digits on net sales of licensed products outside the United States. The Company may opt 
out of its co-funding obligation, in which case the United States profit sharing will no longer be in effect, and Incyte will pay the 
Company tiered royalties ranging from the low to mid-double digits on net sales of licensed products both in the United States and 
outside the United States, and additional royalties to reimburse the Company for previously incurred development costs.

Under the Incyte Collaboration Agreement, the Company received an upfront payment of $45.0 million in February 2017. In 

March 2017, the Company achieved a development milestone of $12.0 million, for which the Company received payment in May of 
2017. The Company is also eligible to receive up to an additional $418.0 million in potential development, regulatory and sales 
milestones.  

The Incyte Collaboration Agreement also provides that the Company may choose to opt out of its co-funding obligations at any 
time. In this scenario, the potential development, regulatory and commercialization milestones from Incyte will be up to an additional 
$738.0 million. The Company would no longer be eligible to receive future United States profits and losses but would be eligible to 
receive tiered royalty payments on future global sales, including United States sales. In addition, if the Company opts out, the 
Company will receive an incremental 3% royalty on annual net sales in the United States of such licensed product until such 
incremental royalty equals 120% of previous development expenditures incurred by the Company.

The Incyte Collaboration Agreement is considered to be under the scope of FASB Topic 808, Collaborative Arrangements. The 

Company has concluded that the research and development co-funding activities were not representative of a customer relationship 
and this unit of account is accounted for as an increase to or reduction of research and development expenses, rather than as revenue. 
In addition, the Company has analogized to ASC 606 for other aspects of the arrangement. The performance obligations under the 
Incyte Collaboration Agreement consist of intellectual property licenses and the performance of certain manufacturing and 
manufacturing technology transfer services. The Company determined that the license was not distinct from the associated 
manufacturing and technology transfer services to be performed under the agreement. Specifically, the Company believes the license 
is not capable of being distinct, as Incyte did not have the know-how to manufacture the collaboration product without Calithera’s 
assistance until completion of the manufacturing technology transfer process, and no other third parties could perform such assistance 
due to the early stage nature of the licensed intellectual property as well as Calithera’s propriety knowledge with respect to the 
licensed intellectual property. Prior to the adoption of ASC 606, the Company concluded that the delivered licenses did not have 
stand-alone value, and the rights conveyed to Incyte did not permit Incyte to perform all efforts necessary to use the Company’s 
technology to bring the compound through development and, upon regulatory approval, commercialization of the compound, without 
the associated manufacturing and technology transfer services. Accordingly, the Company combined these deliverables and allocated 
the upfront consideration of $45.0 million to the combined unit of accounting. The Company recognized the $45.0 million upfront 
payment on a straight-line basis over the estimated period of performance under the Incyte Collaboration Agreement, and recognized 

80

 
 
 
   
   
 
 
  
  
 
  
  
 
  
  
the $12.0 million developmental milestone payment from Incyte on a straight-line basis over the remaining period of performance for 
the combined unit of accounting. For the year ended December 31, 2017, the Company recognized revenue from its collaboration with 
Incyte totaling $26.0 million related to amortization of the $45.0 million upfront fee and the $12.0 million milestone. 

Subsequent to the adoption of ASC 606 on January 1, 2018 under the modified retrospective approach, the transaction price of 

the Incyte Collaboration Agreement was determined to be $57.0 million, representing the $45.0 million upfront payment and the $12.0 
million developmental milestone payment from Incyte that was earned in March 2017. The $57.0 million transaction price was 
recognized over the performance period, based on the measure of progress toward completion for the combined performance 
obligation, rather than on a straight-line basis. The measure of progress towards completion was based on the effort of certain 
employees within the Company who dedicated time to complete the manufacturing services and technology transfer to Incyte. An $8.8 
million cumulative effect adjustment to decrease the accumulated deficit and deferred revenue was recorded on January 1, 2018, as a 
result of applying the new standard. As of June 30, 2018, the manufacturing services and technology transfer to Incyte were 
determined to be substantially complete. For the year ended December 31, 2018, the Company recognized revenue from its 
collaboration with Incyte totaling $22.2 million related to the completion of the combined performance obligation. No revenue was 
recognized during the year ended December 31, 2019, related to the Incyte Collaboration Agreement. 

Net costs associated with co-development activities performed under the Incyte Collaboration Agreement are included in 
research and development expenses in the accompanying consolidated statements of operations, with any reimbursement of costs by 
Incyte reflected as a reduction of such expenses. For the years ended December 31, 2019, 2018 and 2017, net costs (payable to) 
reimbursable by Incyte were ($0.2) million, $3.9 million and $6.4 million, respectively. As of December 31, 2019, the receivable due 
from Incyte was $0.5 million. 

Bristol-Myers Squibb and Pfizer Collaboration Agreements

In December 2016, the Company entered into a clinical trial collaboration and supply agreement with Bristol-Myers Squibb, or 
BMS, to evaluate BMS’s PD-1 inhibitor nivolumab (OPDIVO®) in combination with telaglenastat. In November 2017, the agreement 
was expanded such that certain development costs would be shared. In July 2019, with the enrollment on the trial complete, the 
collaboration with Bristol-Myers was discontinued.  

In October 2018, the Company entered into a clinical trial collaboration and supply agreement with Pfizer to evaluate Pfizer’s 

PARP inhibitor talazoparib (Talzenna) and CDK4/6 inhibitor palbociclib (Ibrance), each in combination with telaglenastat.  

Under the terms of the clinical collaborations, BMS and Pfizer each provide reimbursement of certain development costs. Costs 
associated with development activities performed under the clinical collaborations are included in research and development expenses 
in the accompanying consolidated statements of operations, with any reimbursements of costs reflected as a reduction of such 
expenses. For the year ended December 31, 2019 and 2018, net costs reimbursed and reimbursable by BMS and Pfizer were not 
material to the consolidated financial statements.

Symbioscience License Agreement

In December 2014, the Company entered into an exclusive license agreement with Mars, Inc., by and through its Mars 
Symbioscience division, or Symbioscience, under which the Company has been granted the exclusive, worldwide license rights to 
develop and commercialize Symbioscience’s portfolio of arginase inhibitors for use in human healthcare, or the Symbioscience 
License Agreement. Under the terms of the Symbioscience License Agreement, the Company paid Symbioscience an upfront license 
fee of $0.3 million, which was recorded as research and development expense in 2014. No expenses were recognized related to its 
licensing arrangement with Mars Symbioscience for the year ended December 31, 2019, 2018 and 2017.

The Company may make future payments of up to $23.6 million contingent upon attainment of various development and 
regulatory milestones and $95.0 million contingent upon attainment of various sales milestones. Additionally, the Company will pay 
royalties on sales of the licensed product, if such product sales are ever achieved. If the Company develops additional licensed 
products, after achieving regulatory approval of the first licensed product, the Company would owe additional regulatory milestone 
payments and additional royalty payments based on sales of such additional licensed products.  

81

12. Selected Quarterly Financial Data (Unaudited)

Selected quarterly results from operations for the years ended December 31, 2019 and 2018 are as follows (in thousands, except 

per share amounts): 

2019 Quarter End

Collaboration revenue......................................... $
Operating expenses.............................................  
Net loss ...............................................................  
Basic and diluted net loss per common share..... $

 $

— 
24,403 
(23,687)   
(0.61)  $

March 31,

June 30,

March 31,

June 30,

— 
24,912 
(24,152)   
(0.58)  $

  September 30,  
— 
 $
21,127 
(20,293)   
(0.38)  $

  December 31,  
— 
 $
22,453 
(21,728)
(0.39)

2018 Quarter End

17,065 
20,803 
(3,075)   
(0.09)  $

  September 30,  
— 
 $
19,507 
(18,849)   
(0.52)  $

  December 31,  
— 
 $
20,224 
(19,499)
(0.51)

Collaboration revenue......................................... $
Operating expenses.............................................  
Net loss ...............................................................  
Basic and diluted net loss per common share..... $

 $

5,189 
19,001 
(13,206)   
(0.37)  $

82

 
 
 
 
 
 
  
  
  
 
 
 
 
 
 
  
  
  
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, 2019, management, with the participation of our Chief Executive Officer (Principal Executive Officer and 

Principal 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, to allow timely 
decisions regarding required disclosures.

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. Based on this evaluation, our Chief Executive Officer concluded that, as of December 31, 2019, the design 
and operation of our disclosure controls and procedures were effective at a reasonable assurance level. 

Management’s 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 Exchange Act Rules 13a-15(f) and 15d-15(f). Our management conducted an evaluation of the effectiveness of our 
internal control over financial reporting as of December 31, 2019 based on the criteria established in Internal Control - Integrated 
Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Based on the results of its evaluation, management concluded that our internal control over financial reporting was effective as 

of December 31, 2019.

Our independent registered public accounting firm, Ernst & Young LLP, has audited the effectiveness of our internal control 

over financial reporting as of December 31, 2019 as stated in their attestation report which is included herein.

Limitations on Effectiveness of Controls and Procedures and Internal Control over Financial Reporting

In designing and evaluating the disclosure controls and procedures and internal control over financial reporting, management 

recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of 
achieving the desired control objectives. In addition, the design of disclosure controls and procedures and internal control over 
financial reporting must reflect the fact that there are resource constraints and that management is required to apply judgment in 
evaluating the benefits of possible controls and procedures relative to their costs.

Changes in Internal Control over Financial Reporting 

There was no change in our internal control over financial reporting during the three months ended December 31, 2019 that has 

materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

83

Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Calithera Biosciences, Inc.

Opinion on Internal Control over Financial Reporting

We have audited Calithera Biosciences, Inc.’s internal control over financial reporting as of December 31, 2019, based on criteria 
established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway 
Commission (2013 framework) (the COSO criteria). In our opinion, Calithera Biosciences, Inc. (the Company) maintained, in all 
material respects, effective internal control over financial reporting as of December 31, 2019, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), 
the consolidated balance sheets of Calithera Biosciences, Inc. (the Company) as of December 31, 2019 and 2018, the related 
consolidated statements of operations, comprehensive loss, stockholders' equity and cash flows for each of the three years in the 
period ended December 31, 2019, and the related notes and our report dated March 11, 2020 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of 
the effectiveness of internal control over financial reporting included in the accompanying Management’s Report on Internal Control 
over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based 
on our audit. We are a public accounting firm registered with the 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 audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit 
to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. 

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness 
exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such 
other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our 
opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed 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. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the 
maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the 
company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in 
accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in 
accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding 
prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect 
on the financial statements.

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.

/s/ Ernst & Young LLP

Redwood City, California
March 11, 2020

84

 
 
Item 9B.

Other Information. 

None.

PART III 

Item 10.

Directors, Executive Officers and Corporate Governance. 

Information required by this item will be contained in our definitive proxy statement to be filed with the Securities and 

Exchange Commission on Schedule 14A in connection with our 2020 Annual Meeting of Stockholders or the Proxy Statement, which 
is expected to be filed not later than 120 days after the end of our year ended December 31, 2019, under the headings “Executive 
Officers,” “Election of Directors,” and “Information Regarding the Board of Directors and Corporate Governance,” and is 
incorporated herein by reference.

We have adopted a Code of Business Conduct and Ethics that applies to our officers, directors and employees, which is 
available on our website at www.calithera.com. The Code of Business Conduct and Ethics is intended to qualify as a “code of ethics” 
within the meaning of Section 406 of the Sarbanes-Oxley Act of 2002 and Item 406 of Regulation S-K. In addition, we intend to 
promptly disclose (1) the nature of any amendment to our Code of Business Conduct and Ethics that applies to our principal executive 
officer, principal financial officer, principal accounting officer or controller or persons performing similar functions and (2) the nature 
of any waiver, including an implicit waiver, from a provision of our code of ethics that is granted to one of these specified officers, the 
name of such person who is granted the waiver and the date of the waiver on our website in the future.

Item 11.

Executive Compensation. 

The information required by this item regarding executive compensation is incorporated by reference to the information set forth 

in the section titled “Executive Compensation” in our Proxy Statement.

Item 12.

Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters. 

The information required by this item regarding security ownership of certain beneficial owners and management is 
incorporated by reference to the information set forth in the section titled “Security Ownership of Certain Beneficial Owners and 
Management” in our Proxy Statement.

Item 13.

Certain Relationships and Related Transactions, and Director Independence. 

The information required by this item regarding certain relationships and related transactions and director independence is 
incorporated by reference to the information set forth in the sections titled “Transactions with Related Parties” and “Election of 
Directors – Independence of the Board of Directors,” respectively, in our Proxy Statement.

Item 14.

Principal Accounting Fees and Services. 

The information required by this item regarding principal accountant fees and services is incorporated by reference to the 

information set forth in the section titled “Principal Accountant Fees and Services” in our Proxy Statement. 

85

Item 15.

Exhibits, Financial Statement Schedules. 

(a) The following documents are filed as part of this report:

PART IV 

1. Financial Statements

See Index to Consolidated Financial Statements at Item 8 herein.

2. Financial Statement Schedules

All schedules are omitted because they are not applicable or the required information is shown in the financial statements 
or notes thereto.

3. Exhibits

86

Exhibit
Number

    3.1

    3.2

    4.1

    4.2

Exhibit Description

   Form   SEC File No.    Exhibit  

Filing Date

  Amended and Restated Certificate of Incorporation of the Registrant.

  8-K   001-36644   3.1

  10/07/2014

  Amended and Restated Bylaws of the Registrant.

  S-1   333-198355  3.4

  9/19/2014

  Reference is made to Exhibits 3.1 through 3.2.

  Form of common stock certificate of the Registrant.

  S-1   333-198355  4.1

  9/25/2014

Incorporation By Reference

    4.3^

  Description of Capital Stock.

  10.1

  10.2

  10.3

  10.4

  10.5

  10.6

  10.7

  10.8†

  10.9

Amended and Restated Investor Rights Agreement, among the Registrant and 
certain of its security holders, dated October 7, 2013, as amended.

2014 Equity Incentive Plan.

Forms of option agreement and option grant notice under the  Calithera 
Biosciences, Inc. 2014 Equity Incentive Plan.

2014 Employee Stock Purchase Plan.

  S-1   333-198355  10.1   8/25/2014

S-1

333-198355 10.4

9/25/2014

S-1

S-1

333-198355 10.5

9/25/2014

333-198355 10.6

9/25/2014

Form of Indemnification Agreement between the Registrant and each of its 
directors and executive officers.

S-1

333-198355 10.13 9/19/2014

Lease between Are-Technology Center SSF, LLC and the Registrant, dated 
February 14, 2013.

S-1

333-198355 10.14 8/25/2014

Amendment to lease between Are-Technology Center SSF, LLC and the 
Registrant, dated October 30, 2013.

S-1

333-198355 10.15 8/25/2014

Collaboration and License Agreement by and between the Registrant and 
Mars, Inc., dated December 9, 2014.

10-K 001-36644

10.16 3/27/2015

Second Amendment to Lease Agreement by and between ARE-Technology 
Center SSF, LLC and Calithera Biosciences, Inc., effective March 1, 2016.

10-Q 001-36644

10.18 5/10/2016

  10.10†

Collaboration and License Agreement between Incyte Corporation and the 
Registrant, dated January 27, 2017.

10-Q 001-36644

10.1

5/09/2017

  10.11

  10.12

  10.13

  10.14

  23.1^

  24.1^

  31.1^

  32.1*^

Third Amendment to Lease Agreement between Are-Technology Center SSF, 
LLC and the Registrant, dated February 28, 2017.

10-Q 001-36644

10.2

5/09/2017

Calithera Biosciences Inc. Severance Benefit Plan.

10-Q 001-36644

10.1

11/02/2017

S-8

S-8

333-223533 99.4

03/08/2018

333-223533 99.5

03/08/2018

2018 Inducement Plan.

Form of Stock Option Grant Notice and Option Agreement under the Calithera 
Biosciences, Inc. 2018 Inducement Plan. 

Consent of Independent Registered Public Accounting Firm.

Power of Attorney (included on signature page to this Annual Report on Form 
10-K).

Certifications of Principal Executive and Financial Officer pursuant to Rule 
13a-14(a).

Certification of Principal Executive and Financial Officer pursuant to Rule 
13a-14(b) of the Securities Exchange Act of 1934, as amended, and 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 Taxonomy Extension Schema Document.
101.CAL**  XBRL Taxonomy Extension Calculation Linkbase Document.

87

 
    
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
Exhibit
Number
101.DEF**   XBRL Taxonomy Extension Definition Linkbase Document.

Exhibit Description

101.LAB**  XBRL Taxonomy Extension Label Linkbase Document.

101.PRE**   XBRL Taxonomy Extension Presentation Linkbase Document.

Incorporation By Reference

   Form   SEC File No.    Exhibit  

Filing Date

^
*

**

†

Filed herewith
The certification attached as Exhibit 32.1 that accompanies this Annual Report on Form 10-K is not deemed filed with the 
Securities and Exchange Commission and is not to be incorporated by reference into any filing of Calithera Biosciences, Inc. 
under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, whether made before or 
after the date of this Annual Report on Form 10-K, irrespective of any general incorporation language contained in such filing. 
Attached as Exhibit 101 to this Annual Report on Form 10-K formatted in XBRL (Extensible Business Reporting Language): (i) 
Consolidated Balance Sheets, (ii) Consolidated Statements of Operations, (iii) Consolidated Statements of Comprehensive Loss, 
(iv) Consolidated Statements of Cash Flows, (v) Consolidated Statements of Stockholders’ Equity; and (vi) Notes to 
Consolidated Financial Statements, tagged as blocks of text and including detailed tags.
Confidential treatment has been granted with respect to certain portions of this exhibit. Omitted portions have been filed 
separately with the Securities and Exchange Commission.

88

 
    
  
  
  
  
  
  
  
  
  
  
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.

SIGNATURES

Date: March 11, 2020

  Calithera Biosciences, Inc.

  By:

/s/  Susan M. Molineaux
Susan M. Molineaux, Ph.D.
President and Chief Executive Officer

POWER OF ATTORNEY

Each person whose individual signature appears below hereby authorizes and appoints Susan M. Molineaux and Stephanie 

Wong, 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 or her 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.

Name

Title

Date

/s/ Susan M. Molineaux

Susan M. Molineaux, Ph.D.

  President, Chief Executive Officer and Director
(Principal Executive Officer and Principal Financial 
Officer)

  March 11, 2020

/s/ Stephanie Wong
Stephanie Wong

/s/ Sunil Agarwal
Sunil Agarwal, M.D. 

/s/ Jonathan G. Drachman
Jonathan G. Drachman, M.D.

/s/ Jean M. George
Jean M. George

/s/ Suzy Jones
Suzy Jones

/s/ Deepa R. Pakianathan
Deepa R. Pakianathan, Ph.D.

/s/ Blake Wise
Blake Wise

/s/ H. Ward Wolff
H. Ward Wolff

  Senior Vice President, Finance and Secretary
  (Principal Accounting Officer)

  Director

  Director

  Director

  Director

  Director 

  Director

Director

89

  March 11, 2020

  March 11, 2020

  March 11, 2020

  March 11, 2020

  March 11, 2020

  March 11, 2020

  March 11, 2020

March 11, 2020

 
 
 
   
 
 
   
 
   
 
 
 
 
 
 
 
 
   
 
 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
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(cid:3)
(cid:3)

Management(cid:3)Team(cid:3)
Susan(cid:3)M.(cid:3)Molineaux,(cid:3)Ph.D.(cid:3)
(cid:9)(cid:145)(cid:151)(cid:144)(cid:134)(cid:135)(cid:148)(cid:481)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:8)(cid:154)(cid:135)(cid:133)(cid:151)(cid:150)(cid:139)(cid:152)(cid:135)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)
Curtis(cid:3)C.(cid:3)Hecht(cid:3)
(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:5)(cid:151)(cid:149)(cid:139)(cid:144)(cid:135)(cid:149)(cid:149)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)
Keith(cid:3)Orford,(cid:3)MD,(cid:3)Ph.D.(cid:3)
(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:16)(cid:135)(cid:134)(cid:139)(cid:133)(cid:131)(cid:142)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)
Christopher(cid:3)J.(cid:3)Molineaux,(cid:3)Ph.D.(cid:3)
(cid:22)(cid:135)(cid:144)(cid:139)(cid:145)(cid:148)(cid:3)(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:7)(cid:135)(cid:152)(cid:135)(cid:142)(cid:145)(cid:146)(cid:143)(cid:135)(cid:144)(cid:150)(cid:3)
Sumita(cid:3)Ray(cid:3)(cid:3)
(cid:22)(cid:135)(cid:144)(cid:139)(cid:145)(cid:148)(cid:3)(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:481)(cid:3)(cid:10)(cid:135)(cid:144)(cid:135)(cid:148)(cid:131)(cid:142)(cid:3)(cid:6)(cid:145)(cid:151)(cid:144)(cid:149)(cid:135)(cid:142)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)
(cid:6)(cid:145)(cid:143)(cid:146)(cid:142)(cid:139)(cid:131)(cid:144)(cid:133)(cid:135)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)
Eric(cid:3)B.(cid:3)Sjogren,(cid:3)Ph.D.(cid:3)
(cid:22)(cid:135)(cid:144)(cid:139)(cid:145)(cid:148)(cid:3)(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:7)(cid:148)(cid:151)(cid:137)(cid:3)(cid:7)(cid:139)(cid:149)(cid:133)(cid:145)(cid:152)(cid:135)(cid:148)(cid:155)(cid:3)
Sam(cid:3)Whiting,(cid:3)M.D.,(cid:3)Ph.D.(cid:3)
(cid:22)(cid:135)(cid:144)(cid:139)(cid:145)(cid:148)(cid:3)(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:6)(cid:142)(cid:139)(cid:144)(cid:139)(cid:133)(cid:131)(cid:142)(cid:3)(cid:7)(cid:135)(cid:152)(cid:135)(cid:142)(cid:145)(cid:146)(cid:143)(cid:135)(cid:144)(cid:150)(cid:3)
Stephanie(cid:3)Wong(cid:3)
(cid:22)(cid:135)(cid:144)(cid:139)(cid:145)(cid:148)(cid:3)(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:9)(cid:139)(cid:144)(cid:131)(cid:144)(cid:133)(cid:135)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:22)(cid:135)(cid:133)(cid:148)(cid:135)(cid:150)(cid:131)(cid:148)(cid:155)(cid:3)
Susan(cid:3)Demo,(cid:3)Ph.D.(cid:3)
(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:16)(cid:135)(cid:134)(cid:139)(cid:133)(cid:131)(cid:142)(cid:3)(cid:4)(cid:136)(cid:136)(cid:131)(cid:139)(cid:148)(cid:149)(cid:3)
Jennifer(cid:3)I.(cid:3)McNealey(cid:3)
(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:12)(cid:144)(cid:152)(cid:135)(cid:149)(cid:150)(cid:145)(cid:148)(cid:3)(cid:21)(cid:135)(cid:142)(cid:131)(cid:150)(cid:139)(cid:145)(cid:144)(cid:149)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:22)(cid:150)(cid:148)(cid:131)(cid:150)(cid:135)(cid:137)(cid:155)(cid:3)
Frank(cid:3)Parlati,(cid:3)Ph.D(cid:3)
(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:145)(cid:136)(cid:3)(cid:21)(cid:135)(cid:149)(cid:135)(cid:131)(cid:148)(cid:133)(cid:138)(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)

Board(cid:3)of(cid:3)Directors(cid:3)
Susan(cid:3)M.(cid:3)Molineaux,(cid:3)Ph.D.(cid:3)
(cid:9)(cid:145)(cid:151)(cid:144)(cid:134)(cid:135)(cid:148)(cid:481)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:8)(cid:154)(cid:135)(cid:133)(cid:151)(cid:150)(cid:139)(cid:152)(cid:135)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)
Jean(cid:3)M.(cid:3)George(cid:3)
(cid:10)(cid:135)(cid:144)(cid:135)(cid:148)(cid:131)(cid:142)(cid:3)(cid:19)(cid:131)(cid:148)(cid:150)(cid:144)(cid:135)(cid:148)(cid:3)
(cid:4)(cid:134)(cid:152)(cid:131)(cid:144)(cid:133)(cid:135)(cid:134)(cid:3)(cid:23)(cid:135)(cid:133)(cid:138)(cid:144)(cid:145)(cid:142)(cid:145)(cid:137)(cid:155)(cid:3)(cid:25)(cid:135)(cid:144)(cid:150)(cid:151)(cid:148)(cid:135)(cid:149)(cid:3)
Deepa(cid:3)R.(cid:3)Pakianathan,(cid:3)Ph.D.(cid:3)
(cid:16)(cid:131)(cid:144)(cid:131)(cid:137)(cid:139)(cid:144)(cid:137)(cid:3)(cid:16)(cid:135)(cid:143)(cid:132)(cid:135)(cid:148)(cid:3)
(cid:7)(cid:135)(cid:142)(cid:146)(cid:138)(cid:139)(cid:3)(cid:25)(cid:135)(cid:144)(cid:150)(cid:151)(cid:148)(cid:135)(cid:149)(cid:3)
Jonathan(cid:3)Drachman,(cid:3)M.D.(cid:3)
(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:8)(cid:154)(cid:135)(cid:133)(cid:151)(cid:150)(cid:139)(cid:152)(cid:135)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)(cid:3)
(cid:17)(cid:135)(cid:145)(cid:142)(cid:135)(cid:151)(cid:141)(cid:139)(cid:144)(cid:3)(cid:23)(cid:138)(cid:135)(cid:148)(cid:131)(cid:146)(cid:135)(cid:151)(cid:150)(cid:139)(cid:133)(cid:149)(cid:3)
H.(cid:3)Ward(cid:3)Wolff(cid:3)
(cid:9)(cid:145)(cid:148)(cid:143)(cid:135)(cid:148)(cid:3)(cid:8)(cid:154)(cid:135)(cid:133)(cid:151)(cid:150)(cid:139)(cid:152)(cid:135)(cid:3)(cid:25)(cid:139)(cid:133)(cid:135)(cid:3)(cid:19)(cid:148)(cid:135)(cid:149)(cid:139)(cid:134)(cid:135)(cid:144)(cid:150)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:6)(cid:9)(cid:18)(cid:3)
(cid:22)(cid:131)(cid:144)(cid:137)(cid:131)(cid:143)(cid:145)(cid:3)(cid:23)(cid:138)(cid:135)(cid:148)(cid:131)(cid:146)(cid:135)(cid:151)(cid:150)(cid:139)(cid:133)(cid:149)(cid:3)
Sunil(cid:3)Agarwal,(cid:3)M.D.(cid:3)
(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:7)(cid:135)(cid:152)(cid:135)(cid:142)(cid:145)(cid:146)(cid:143)(cid:135)(cid:144)(cid:150)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:11)(cid:135)(cid:131)(cid:134)(cid:3)(cid:19)(cid:145)(cid:148)(cid:150)(cid:136)(cid:145)(cid:142)(cid:139)(cid:145)(cid:3)(cid:22)(cid:150)(cid:148)(cid:131)(cid:150)(cid:135)(cid:137)(cid:155)(cid:3)
(cid:22)(cid:131)(cid:144)(cid:131)(cid:3)(cid:5)(cid:139)(cid:145)(cid:150)(cid:135)(cid:133)(cid:138)(cid:144)(cid:145)(cid:142)(cid:145)(cid:137)(cid:155)(cid:3)(cid:3)
Suzy(cid:3)Jones(cid:3)
(cid:9)(cid:145)(cid:151)(cid:144)(cid:134)(cid:135)(cid:148)(cid:3)(cid:131)(cid:144)(cid:134)(cid:3)(cid:16)(cid:131)(cid:144)(cid:131)(cid:137)(cid:139)(cid:144)(cid:137)(cid:3)(cid:19)(cid:131)(cid:148)(cid:150)(cid:144)(cid:135)(cid:148)(cid:3)
(cid:7)(cid:17)(cid:4)(cid:3)(cid:12)(cid:144)(cid:141)(cid:3)
Blake(cid:3)Wise(cid:3)
(cid:6)(cid:138)(cid:139)(cid:135)(cid:136)(cid:3)(cid:8)(cid:154)(cid:135)(cid:133)(cid:151)(cid:150)(cid:139)(cid:152)(cid:135)(cid:3)(cid:18)(cid:136)(cid:136)(cid:139)(cid:133)(cid:135)(cid:148)(cid:3)
(cid:17)(cid:145)(cid:152)(cid:145)(cid:143)(cid:135)(cid:3)(cid:5)(cid:139)(cid:145)(cid:150)(cid:135)(cid:133)(cid:138)(cid:144)(cid:145)(cid:142)(cid:145)(cid:137)(cid:139)(cid:135)(cid:149)(cid:3)
(cid:3)
(cid:3)
Stockholder(cid:3)Information(cid:3)
Corporate(cid:3)Headquarters(cid:3)
(cid:6)(cid:131)(cid:142)(cid:139)(cid:150)(cid:138)(cid:135)(cid:148)(cid:131)(cid:3)(cid:5)(cid:139)(cid:145)(cid:149)(cid:133)(cid:139)(cid:135)(cid:144)(cid:133)(cid:135)(cid:149)(cid:3)
(cid:885)(cid:886)(cid:885)(cid:3)(cid:18)(cid:155)(cid:149)(cid:150)(cid:135)(cid:148)(cid:3)(cid:19)(cid:145)(cid:139)(cid:144)(cid:150)(cid:3)(cid:5)(cid:145)(cid:151)(cid:142)(cid:135)(cid:152)(cid:131)(cid:148)(cid:134)(cid:481)(cid:3)(cid:22)(cid:151)(cid:139)(cid:150)(cid:135)(cid:3)(cid:884)(cid:882)(cid:882)(cid:3)
(cid:22)(cid:145)(cid:151)(cid:150)(cid:138)(cid:3)(cid:22)(cid:131)(cid:144)(cid:3)(cid:9)(cid:148)(cid:131)(cid:144)(cid:133)(cid:139)(cid:149)(cid:133)(cid:145)(cid:481)(cid:3)(cid:6)(cid:4)(cid:3)(cid:891)(cid:886)(cid:882)(cid:890)(cid:882)(cid:3)
Stockholder(cid:3)Inquiry(cid:3)
(cid:21)(cid:135)(cid:147)(cid:151)(cid:135)(cid:149)(cid:150)(cid:149)(cid:3)(cid:136)(cid:145)(cid:148)(cid:3)(cid:139)(cid:144)(cid:136)(cid:145)(cid:148)(cid:143)(cid:131)(cid:150)(cid:139)(cid:145)(cid:144)(cid:3)(cid:143)(cid:131)(cid:155)(cid:3)(cid:132)(cid:135)(cid:3)(cid:149)(cid:135)(cid:144)(cid:150)(cid:3)(cid:150)(cid:145)(cid:3)(cid:12)(cid:144)(cid:152)(cid:135)(cid:149)(cid:150)(cid:145)(cid:148)(cid:3)
(cid:21)(cid:135)(cid:142)(cid:131)(cid:150)(cid:139)(cid:145)(cid:144)(cid:149)(cid:3)(cid:131)(cid:150)(cid:3)(cid:145)(cid:151)(cid:148)(cid:3)(cid:6)(cid:145)(cid:148)(cid:146)(cid:145)(cid:148)(cid:131)(cid:150)(cid:135)(cid:3)(cid:11)(cid:135)(cid:131)(cid:134)(cid:147)(cid:151)(cid:131)(cid:148)(cid:150)(cid:135)(cid:148)(cid:149)(cid:3)(cid:145)(cid:148)(cid:3)(cid:132)(cid:155)(cid:3)(cid:152)(cid:139)(cid:149)(cid:139)(cid:150)(cid:139)(cid:144)(cid:137)(cid:3)
(cid:150)(cid:138)(cid:135)(cid:3)(cid:139)(cid:144)(cid:152)(cid:135)(cid:149)(cid:150)(cid:145)(cid:148)(cid:3)(cid:148)(cid:135)(cid:142)(cid:131)(cid:150)(cid:139)(cid:145)(cid:144)(cid:149)(cid:3)(cid:146)(cid:145)(cid:148)(cid:150)(cid:139)(cid:145)(cid:144)(cid:3)(cid:145)(cid:136)(cid:3)(cid:145)(cid:151)(cid:148)(cid:3)(cid:153)(cid:135)(cid:132)(cid:149)(cid:139)(cid:150)(cid:135)(cid:3)(cid:131)(cid:150)(cid:483)(cid:3)
(cid:153)(cid:153)(cid:153)(cid:484)(cid:133)(cid:131)(cid:142)(cid:139)(cid:150)(cid:138)(cid:135)(cid:148)(cid:131)(cid:484)(cid:133)(cid:145)(cid:143)(cid:3)
Stock(cid:3)Listing(cid:3)
(cid:17)(cid:4)(cid:22)(cid:7)(cid:4)(cid:20)(cid:483)(cid:3)(cid:6)(cid:4)(cid:15)(cid:4)(cid:3)
Transfer(cid:3)Agent(cid:3)
(cid:4)(cid:143)(cid:135)(cid:148)(cid:139)(cid:133)(cid:131)(cid:144)(cid:3)(cid:22)(cid:150)(cid:145)(cid:133)(cid:141)(cid:3)(cid:23)(cid:148)(cid:131)(cid:144)(cid:149)(cid:136)(cid:135)(cid:148)(cid:3)(cid:428)(cid:3)(cid:23)(cid:148)(cid:151)(cid:149)(cid:150)(cid:3)(cid:6)(cid:145)(cid:143)(cid:146)(cid:131)(cid:144)(cid:155)(cid:481)(cid:3)(cid:15)(cid:15)(cid:6)(cid:3)(cid:888)(cid:884)(cid:882)(cid:883)(cid:3)
(cid:883)(cid:887)(cid:150)(cid:138)(cid:3)(cid:4)(cid:152)(cid:135)(cid:144)(cid:151)(cid:135)(cid:3)(cid:5)(cid:148)(cid:145)(cid:145)(cid:141)(cid:142)(cid:155)(cid:144)(cid:481)(cid:3)(cid:17)(cid:135)(cid:153)(cid:3)(cid:28)(cid:145)(cid:148)(cid:141)(cid:3)(cid:883)(cid:883)(cid:884)(cid:883)(cid:891)(cid:3)
Legal(cid:3)Counsel(cid:3)
(cid:6)(cid:145)(cid:145)(cid:142)(cid:135)(cid:155)(cid:3)
(cid:19)(cid:131)(cid:142)(cid:145)(cid:3)(cid:4)(cid:142)(cid:150)(cid:145)(cid:481)(cid:3)(cid:6)(cid:131)(cid:142)(cid:139)(cid:136)(cid:145)(cid:148)(cid:144)(cid:139)(cid:131)(cid:3)
Independent(cid:3)Registered(cid:3)Public(cid:3)Accounting(cid:3)Firm(cid:3)
(cid:8)(cid:148)(cid:144)(cid:149)(cid:150)(cid:3)(cid:428)(cid:3)(cid:28)(cid:145)(cid:151)(cid:144)(cid:137)(cid:3)(cid:15)(cid:15)(cid:19)(cid:3)
(cid:21)(cid:135)(cid:134)(cid:153)(cid:145)(cid:145)(cid:134)(cid:3)(cid:6)(cid:139)(cid:150)(cid:155)(cid:481)(cid:3)(cid:6)(cid:131)(cid:142)(cid:139)(cid:136)(cid:145)(cid:148)(cid:144)(cid:139)(cid:131)(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)

(cid:3)
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(cid:3)
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(cid:3)
(cid:3)
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(cid:3)
(cid:3)
(cid:3)
(cid:3)
(cid:3)
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(cid:3)
(cid:3)
(cid:3)

(cid:6)(cid:131)(cid:142)(cid:139)(cid:150)(cid:138)(cid:135)(cid:148)(cid:131)(cid:3)(cid:5)(cid:139)(cid:145)(cid:149)(cid:133)(cid:139)(cid:135)(cid:144)(cid:133)(cid:135)(cid:149)(cid:481)(cid:3)(cid:12)(cid:144)(cid:133)(cid:484)
(cid:885)(cid:886)(cid:885)(cid:3)(cid:18)(cid:155)(cid:149)(cid:150)(cid:135)(cid:148)(cid:3)(cid:19)(cid:145)(cid:139)(cid:144)(cid:150)(cid:3)(cid:5)(cid:145)(cid:151)(cid:142)(cid:135)(cid:152)(cid:131)(cid:148)(cid:134)(cid:481)(cid:3)(cid:22)(cid:151)(cid:139)(cid:150)(cid:135)(cid:3)(cid:884)(cid:882)(cid:882)(cid:3)
(cid:22)(cid:145)(cid:151)(cid:150)(cid:138)(cid:3)(cid:22)(cid:131)(cid:144)(cid:3)(cid:9)(cid:148)(cid:131)(cid:144)(cid:133)(cid:139)(cid:149)(cid:133)(cid:145)(cid:481)(cid:3)(cid:6)(cid:4)(cid:3)(cid:891)(cid:886)(cid:882)(cid:890)(cid:882)(cid:3)

(cid:153)(cid:153)(cid:153)(cid:484)(cid:133)(cid:131)(cid:142)(cid:139)(cid:150)(cid:138)(cid:135)(cid:148)(cid:131)(cid:484)(cid:133)(cid:145)(cid:143)(cid:3)
(cid:3)