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Cabaletta Bio, Inc.

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

FORM 10-K

(Mark One)
☒

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

For the fiscal year ended December 31, 2020

☐

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

Commission File Number 001-39103

CABALETTA BIO, INC.

(Exact name of Registrant as specified in its Charter)

Delaware
(State or other jurisdiction of
incorporation or organization)
2929 Arch Street, Suite 600
Philadelphia, PA
(Address of principal executive offices)

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

Title of each class
Common Stock, par value $0.00001 per share

Securities registered pursuant to Section 12(g) of the Act: None

82-1685768
(I.R.S. Employer
Identification No.)

19104
(Zip Code)

Registrant’s telephone number, including area code:  (267) 759-3100

Trading
Symbol(s)
CABA

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

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes  ☐ No ☒

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.  Yes  ☐ No ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period
that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically 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 ☒ No ☐

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

  ☐

  ☒

   Accelerated filer

   Smaller reporting company

  Emerging growth company

  ☐

  ☒

  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided
pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the
Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes  ☐ No ☒

As of June 30, 2020 (the last business day of the registrant's most recently completed second fiscal quarter), the aggregate market value of the registrant's common stock held by non-affiliates was approximately
$214 million based on the last reported sale price of the registrant's common stock on the Nasdaq Global Select Market on June 30, 2020.

The number of shares of registrant’s Common Stock outstanding as of March 10, 2021 was 24,062,775.

Part III of this Annual Report on Form 10-K incorporates by reference certain information from the registrant’s definitive Proxy Statement for its 2021 annual meeting of shareholders, which the registrant intends
to file pursuant to Regulation 14A with the Securities and Exchange Commission not later than 120 days after the registrant’s fiscal year end of December 31, 2020. Except with respect to information specifically
incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.

DOCUMENTS INCORPORATED BY REFERENCE

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

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

PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

PART IV
Item 15.
Item 16

Table of Contents

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

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

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

Exhibits, Financial Statement Schedules
Form 10-K Summary
Signatures

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Summary of the Material and Other Risks Associated with Our Business

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We are a clinical-stage company with a limited operating history, have incurred significant losses since our inception, and anticipate that we will continue to incur
significant losses for the foreseeable future.

We are highly dependent on our relationship with University of Pennsylvania, or Penn, for our preclinical research and development activities, key technology and
our current manufacturing needs for our clinical trial of DSG3-CAART, or the DesCAARTesTM trial, and if Penn’s manufacturing capacity is reduced or otherwise
delayed or limited, this could adversely impact enrollment in our DesCAARTesTM trial.

We are reliant on intellectual property licensed to us by Penn and termination of our license agreement with Penn would result in the loss of significant rights, which
would have a material adverse effect on our business.

If we are unable to obtain and maintain sufficient intellectual property protection for DSG3-CAART, our other product candidates and technologies or any future
product candidates, we may not be able to compete effectively in our markets.

We will need to raise substantial additional funding before we can expect to complete development of any of our product candidates or generate any revenues from
product sales.

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

If we are unable to successfully develop our current programs into a portfolio of product candidates, or experience significant delays in doing so, we may not realize
the full commercial potential of our current and future product candidates.

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

If we are unable to advance our product candidates through clinical development, obtain regulatory approval and ultimately commercialize our product candidates,
or experience significant delays in doing so, our business will be materially harmed.

Results of earlier studies may not be predictive of future study or trial results, and we may fail to establish an adequate safety and efficacy profile to conduct clinical
trials or obtain regulatory approval for our product candidates.

If serious adverse events, undesirable side effects or unexpected characteristics are identified during the development of any of our product candidates, we may
need to delay, abandon or limit our further clinical development of those product candidates.

The COVID-19 pandemic and the future outbreak of other highly infectious or contagious diseases could seriously harm our research, development and potential
future commercialization efforts, increase our costs and expenses and have a material adverse effect on our business, financial condition and results of operations.

Manufacturing and administering our product candidates is complex and we may encounter difficulties in technology transfer from Penn to a contract
manufacturing organization.

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

We may establish our own manufacturing facility and infrastructure in addition to or in lieu of relying on third parties for the manufacture of our product
candidates, which will be costly and time-consuming, and which may not be successful.

Our future success depends in part upon our ability to retain our key employees, consultants and advisors and to attract, retain and motivate other qualified
personnel.

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SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K, including the sections entitled “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of
Operations,” contains express or implied forward-looking statements that are based on our management’s  belief  and  assumptions  and  on  information  currently  available  to  our
management.  Although  we  believe  that  the  expectations  reflected  in  these  forward-looking  statements  are  reasonable,  these  statements  relate  to  future  events  or  our  future
operational or financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be
materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Forward-looking statements in this Annual
Report on Form 10-K include, but are not limited to, statements about:

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the success, cost and timing and conduct of our clinical trial program, including our clinical trial of DSG3-CAART, or the DesCAARTesTM  trial,  and  our
other product candidates, including statements regarding the timing of initiation and completion of the clinical trials and the period during which the results of
the clinical trials will become available;
the timing of and our ability to obtain and maintain regulatory approval of our product candidates, including DSG3-CAART, MuSK-CAART, FVIII-CAART
and DSG3/1-CAART, in any of the indications for which we plan to develop them, and any related restrictions, limitations, and/or warnings in the label of an
approved product candidate;
the impact of any business interruptions to our operations, including the timing and enrollment of patients in our ongoing and planned clinical trials and our
planned  Investigational  New  Drug  application  submissions,  or  to  those  of  our  clinical  sites,  manufacturers,  suppliers,  or  other  vendors  resulting  from  the
coronavirus disease (COVID-19) pandemic or similar public health crisis;
our  expected  use  of  proceeds  from  the  initial  public  offering  and  the  period  over  which  such  proceeds,  together  with  cash,  will  be  sufficient  to  meet  our
operating needs;
our plans to pursue research and development of other product candidates;
our plan to infuse our DSG3-CAART product candidate without lymphodepletion or other preconditioning agents initially in our DesCAARTesTM trial;
the  potential  advantages  of  our  proprietary  Cabaletta  Approach  for  selective  B  cell  Ablation  platform,  called  our  CABA  platform,  and  our  product
candidates;
the extent to which our scientific approach and CABA platform may potentially address a broad range of diseases;
the potential benefits and success of our arrangements and our expanded sponsored research agreement with the Trustees of the University of Pennsylvania,
or Penn, and the Children’s Hospital of Philadelphia, or CHOP, and our scientific co-founders, Drs. Milone and Payne;
our ability to successfully commercialize our product candidates, including DSG3-CAART and our other product candidates;
the potential receipt of revenue from future sales of DSG3-CAART and our other product candidates;
the rate and degree of market acceptance and clinical utility of DSG3-CAART and our other product candidates;
our estimates regarding the potential market opportunity for DSG3-CAART and our other product candidates, and our ability to serve those markets;
our sales, marketing and distribution capabilities and strategy, whether alone or with potential future collaborators;
our ability to establish and maintain arrangements or a facility for manufacture of DSG3-CAART and our other product candidates;
our ability to obtain funding for our operations, including funding necessary to initiate and complete our  DesCAARTesTM trial and our ongoing preclinical
studies of MuSK-CAART, DSG3/1-CAART and FVIII-CAART;
the potential achievement of milestones and receipt of payments under our collaborations;
our ability to enter into additional collaborations with existing collaborators or other third parties;
our expectations regarding our ability to obtain and maintain intellectual property protection for our product candidates and our ability to operate our business
without infringing on the intellectual property rights of others;
the success of competing therapies that are or become available, and our competitive position;
the accuracy of our estimates regarding expenses, future revenues, capital requirements and needs for additional financing;
the impact of government laws and regulations in the United States and foreign countries; and
our ability to attract and retain key scientific or management personnel.

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These factors should not be construed as exhaustive and should be read in conjunction with the other cautionary statements that are included in this Annual Report on
Form 10-K. The forward-looking statements contained in this Annual Report on Form 10-K are made as of the date of this Annual Report on Form 10-K, and we undertake no
obligations to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise.

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  PART I

  Item 1. Business.

Overview

We are a clinical-stage biotechnology company focused on the discovery and development of engineered T cell therapies, and exploring their potential to provide a
deep and durable, perhaps curative, treatment, for patients with B cell-mediated autoimmune diseases. Our proprietary technology utilizes Chimeric AutoAntibody Receptor, or
CAAR, T cells that are designed to selectively bind and eliminate only specific B cells that produce disease-causing autoantibodies, or pathogenic B cells, while sparing normal
B  cells.  Our  lead  CAAR  T  cell  product  candidate  was  designed  based  on  the  clinically  validated  and  commercially  approved  Chimeric  Antigen  Receptor,  or  CAR,  T  cell
technology that is marketed for the treatment of B cell cancers. By harnessing the power of targeted cell therapy, we believe our CAAR T product candidates have the potential to
provide responses that may be a safer and more effective option than current treatments. We believe our technology, in combination with our proprietary  Cabaletta Approach for
selective B cell Ablation platform, called our CABA platform, has applicability across over two dozen B cell-mediated autoimmune diseases that we have identified, evaluated and
prioritized. Our initial focus is mucosal pemphigus vulgaris, or mPV, which is an autoimmune blistering disease. Our lead product candidate, DSG3-CAART, designed to treat
patients with mPV, is currently enrolling patients for a Phase 1 trial, or the DesCAARTes TM  trial. We expect to report the acute safety data from the first cohort of patients in the
DesCAARTesTM   trial  in  the  first  half  of  2021,  with  additional  topline  data  on  any  completed  dose  cohorts  throughout  the  second  half  of  2021.  Our  lead  preclinical  product
candidate, designed for the treatment of muscle-specific kinase myasthenia gravis, or MuSK MG, is currently in Investigational New Drug, or IND, enabling studies with an IND
submission expected in the second half of 2021. We are also advancing additional product candidates currently in discovery-stage or preclinical development for the treatment of
mucocutaneous PV, or mcPV, and Hemophilia A with Factor VIII, or FVIII, alloantibodies in addition to three undisclosed targets.

B cell-mediated autoimmune diseases occur when certain populations of B cells mistakenly produce autoantibodies, which are directed against specific healthy tissue
or cells in the body. The presence of autoantibodies can manifest in a variety of autoimmune diseases and result in the destruction of healthy tissue in the body. Current treatment
options for B cell-mediated autoimmune diseases are generally limited to corticosteroids and other generalized immunosuppressants that offer only temporary disease suppression,
may  require  chronic,  in-hospital  administration  and  are  associated  with  potentially  life-threatening  side  effects.  We  believe  the  ideal  therapy  for  B  cell-mediated  autoimmune
diseases would selectively and completely eliminate the pathogenic B cells while sparing the body’s normal B cells.

We are pioneering the development of a new class of engineered T cell therapies that express CAARs to selectively engage and eliminate pathogenic B cells. Our CAARs
build upon the scientific foundation of CARs, differing primarily in the use of the antigen rather than an antibody fragment, which enables the CAAR T cells to serve as a “decoy”
for specific autoantibodies expressed on the surface of B cells. This allows these pathogenic B cells to engage with the CAAR T cells instead of benign antigens, resulting in their
elimination. We have developed our CABA platform to inform product candidate development from scientific, clinical and commercial assessment through CAAR design. Using
our CABA platform, we have identified and thoroughly evaluated over two dozen B cell-mediated autoimmune diseases that we believe will be amenable to treatment with the
Cabaletta approach and have advanced several of our highest priority targets into discovery and preclinical testing.

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Our current product candidate pipeline is illustrated below.

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In our discovery stage, we perform epitope mapping and optimize CAAR construct and design.
May not be required if Phase 2 is a registrational clinical trial, subject to discussion with the FDA.

  Our  initial  therapeutic  focus  is  on  pemphigus  vulgaris,  or  PV,  a  chronic,  autoimmune  blistering  skin  disease.  Despite  a  current  standard  of  care  that  includes
corticosteroids  and  adjunctive  immunosuppressive  agents,  PV remains  associated  with  frequent  recurrences  as  well  as  substantial  morbidity  and  mortality.  Our  lead  product
candidate, DSG3-CAART, is being evaluated for the treatment of mPV, a subtype of PV that affects mucosal surfaces. mPV is caused by autoantibodies against the cell adhesion
protein  desmoglein  3,  or  DSG3.  DSG3-CAART  is  designed  to  selectively  target  B  cells  expressing  autoantibodies  specific  for  DSG3,  which  may  prevent  these  B  cells  from
producing DSG3 antibodies that are the cause of mPV while preserving general B cell immune function. In January 2020, the U.S. Food and Drug Administration, or the FDA,
granted orphan drug designation to DSG3-CAART for the treatment of PV. In May 2020, DSG3-CAART received fast track designation from the FDA for improving healing of
mucosal  blisters  in  patients  with  mPV.  In  December  2020,  we  announced  that  the  first  patient  had  been  dosed  in  the  DesCAARTes™  trial.  Our  next  PV-directed  product
candidate, DSG3/1-CAART, is being designed to target B cells expressing autoantibodies against DSG3 and desmoglein 1, or DSG1. It is being developed for the treatment of
mucocutaneous PV, or mcPV, another subtype of PV that affects both mucosal and skin surfaces and is caused by autoantibodies against DSG3 and DSG1, respectively.

Our lead preclinical product candidate, MuSK-CAART, is designed to treat a subset of patients with myasthenia gravis, or MG. MG is an autoimmune disease induced by
autoantibodies targeting the neuromuscular junction, or NMJ, which can lead to life-threatening muscle weakness. Our product candidate targets B cells expressing autoantibodies
against a transmembrane protein, muscle-specific kinase, or MuSK, and is being developed for the treatment of MuSK MG. Data from our initial in vitro and in vivo studies of
MuSK-CAART was presented at the American Academy of Neurology’s Science Highlights Virtual Platform in May 2020. The efficacy and safety of MuSK CAAR T cells were
investigated using in vitro cytotoxicity assays, in vitro screens for off-target toxicity and a mouse model to evaluate the efficacy of human MuSK CAAR T cells against MuSK
antibody expressing B cells in vivo. In preclinical studies, MuSK CAAR T cells demonstrated in vitro cytotoxicity towards a B cell line expressing anti-MuSK antibodies, but we
did  not  observe  any  cytotoxicity  when  the  anti-MuSK  antibody  was  not  expressed.  In  addition,  MuSK  CAAR  T  cells  also  targeted  and  eliminated  a  panel  of  B  cells  targeting
different  MuSK  epitopes.  In  an in vivo  mouse  model,  MuSK  CAAR  T  cells,  but  not  control  CAAR  T  cells,  showed  biological  activity  by  blocking  the  growth  of  B  cell  lines
expressing an anti-MuSK antibody. Based in part on these results, IND-enabling studies have been initiated and an IND submission is anticipated in the second half of 2021.

We are also pursuing development of an additional product candidate, FVIII-CAART, which is being designed to treat a subset of patients with Hemophilia A, an X-
linked bleeding disorder caused by mutations in the FVIII gene. While our CABA platform is primarily focused on the treatment of B cell-mediated autoimmune diseases, we
believe our approach may be applicable in other instances where B cell antibody production is

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implicated in response to exogenous FVIII, which is administered for the treatment of Hemophilia A. Specifically, we have identified an unmet need in cases where the immune
system produces antibodies against exogenous antigens, which is known as an alloimmune response. Some patients receiving repeated administrations of exogenous FVIII will
develop alloantibodies against the treatment, also known as inhibitors, neutralizing its therapeutic potential. Patients with FVIII alloantibodies may often require high-dose FVIII,
immune tolerance induction with FVIII, agents that mimic FVIII or plasmapheresis to remove the FVIII alloantibodies. FVIII-CAART leverages a CAAR designed to target B cells
expressing alloantibodies against FVIII, and it is initially being developed as an adjunctive therapy for Hemophilia A patients who develop FVIII alloantibodies.

Our  manufacturing  strategy  is  a  three-stage  process  designed  to  initially  leverage  the  extensive  early-stage  manufacturing  expertise  of  our  academic  partners  while
migrating to contract manufacturing organization, or CMO, partnerships and ultimately aiming to achieve full manufacturing independence. We believe partnering with proven and
reputable manufacturing partners has allowed us to efficiently deploy financial and personnel resources. Stage 1 leverages the expertise in cell and vector manufacturing of our
partners at the Children’s Hospital of Philadelphia, or CHOP, and the University of Pennsylvania, or Penn. This stage included early development work, support of the DSG3-
CAART IND, and cell and vector product manufacturing for our DesCAARTes TM trial. We believe these partnerships and use of these established facilities have allowed us to
move  efficiently  into  clinical  trials,  but  are  not  sufficient  to  support  a  commercial  license.  Stage  2,  which  is  ongoing,  is  designed  to  engage  partners  who  are  qualified  for
manufacturing  of  vectors  at  commercial  grade  and  scale  and  who  have  experience  with  cell  processing.  In  January  2021,  we  initiated  a  collaboration  with  WuXi Advanced
Therapies, Inc. or WuXi, to serve as our cell processing manufacturing partner for the anticipated MuSK-CAART Phase 1 clinical trial.  Contingent on sufficient clinical evidence
from the DesCAARTes TM trial, we plan to advance the third stage of our manufacturing strategy which will include building, qualifying and operating our own manufacturing
facility. We believe  this  additional  stage  will  enable  full  control  of  product  development  and  commercial  supply  for  products  arising  from  our  CABA  platform,  enabling  us  to
achieve continuous improvement of our product candidates. Our Chief Executive Officer and Executive Vice President, Science and Technology, have both, in prior roles, built
and led organizations that have constructed and commissioned cell therapy facilities which we hope will enable us to smoothly transition to stage 3 when feasible.

We  plan  to  build  upon  our  first  mover  advantage  in  the  field  of  targeted  cell  therapy  for  B  cell-mediated  autoimmune  diseases  and  further  advance  the  discovery,
development  and  commercialization  of  our  CAAR  T  portfolio.  Our  extensive  correlative  study  program  has  been  designed  to  inform  clinical  observations  from  the
DesCAARTesTM trial in order to preserve and expand our industry leading insights into the impact of CAAR T therapies in patients. Our scientific founders are leading experts in
B cell-mediated autoimmune diseases and CAR T technology, and we are led by an experienced team with demonstrated success in discovering, developing, manufacturing, and
evaluating novel cell therapy products in clinical trials. In addition, we have partnered our discovery and initial development efforts with Penn, a pioneer in cell and gene therapy
with a proven track record of expertise in the translational research, clinical development and manufacturing of cell therapy products, in order to advance our lead product candidate
in clinical trials along with our preclinical product candidates.

Our History and Team

Our scientific co-founders, Aimee Payne, M.D., Ph.D., and Michael Milone, M.D., Ph.D., began partnering at Penn in 2013 to combine Dr. Payne’s expertise in B cell-
mediated  autoimmune  diseases  with  Dr.  Milone’s  deep  and  experienced  insights  into  the  design  and  implementation  of  CAR  T  products.  Dr.  Payne  is  a  worldwide  leader  in
characterizing B cell-mediated autoantibody repertoires in PV and other autoimmune diseases. Dr. Milone is a renowned scientist in CAR T therapy and was a co-inventor of and a
key  driver  in  the  preclinical  discovery  and  development  efforts  that  yielded  Kymriah,  the  first  FDA-approved  CAR  T  therapy  for  the  treatment  of  B  cell  cancers.  Dr.  Payne’s
laboratory surmised that by incorporating an antigen instead of an antibody fragment as the extracellular domain of the CAAR, specific pathogenic B cells could be targeted. This
resulted in a collaboration between the two investigators to apply the scientific foundation of CAR T technology as it has been advanced by Drs. Payne and Milone in order to
address B cell-mediated autoimmune diseases.

Their  first  scientific  publication,  “Reengineering  chimeric  antigen  receptor  T  cells  for  targeted  therapy  of  autoimmune  disease”  (Science,  July  2016),  attracted  the

attention of a colleague, Steven Nichtberger, M.D., who is an adjunct professor at the Wharton School at the University of Pennsylvania, teaching a class on biotech company

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formation,  financing  and  leadership  in  the  Vagelos  Life  Sciences  &  Management  Program.  Additionally,  Dr.  Nichtberger  has  experience  creating  and  building  companies,
including a novel cellular therapy company, which required transferring the technology from an academic institution, establishing a research and development organization, hiring
of  manufacturing  and  quality  teams,  creating  novel  manufacturing  processes,  reaching  agreement  with  the  FDA  on  novel  clinical  development  pathways  and  constructing  a
commercial-scale  Good  Manufacturing  Practices,  or  GMP,  facility  that  manufactured  autologous  cell  therapy  products  for  clinical  trials.  In  2017,  based  on  over  a  year  of
interaction and discussions regarding the optimal strategy to advance the scientific opportunity into a commercially developed product portfolio that could offer potentially curative
treatment options to patients, Drs. Payne, Milone and Nichtberger decided to launch Cabaletta Bio.

The  longstanding  and  highly  productive  partnership  between  our  co-founders  has  been  complemented  by  additional  management  experience  that  brings  a  successful
history  of  translating  academic  cellular  therapy  research  from  Penn  and  elsewhere  into  commercially  sponsored  clinical  trials  and  the  establishment  of  a  GMP  manufacturing
facility  and  organization.  Gwendolyn  Binder,  Ph.D.,  our  Executive  Vice  President,  Science  and  Technology,  was  an  early  member  of  the  Translational  Research  Program
Operations team at Penn for over five years and participated in the submission and acceptance of multiple INDs for novel engineered T cell therapy products. As part of the cell
therapy organization at Penn, Dr. Binder partnered with Dr. Milone and others to drive the IND-enabling translational studies that facilitated the initial CAR T clinical trial in B cell
cancers  at  Penn.  Dr.  Binder  also  built  and  led  a  clinical  stage  biotechnology  company’s  manufacturing  operations  and  quality  teams,  including  creation  of  a  fully  functioning
commercial grade GMP facility. Dr. Binder also built the translational research program and ultimately led the company’s research organization.

Our Research and Manufacturing Collaboration with Penn

Our  CABA  platform  has  already  produced  multiple  product  candidates  through  our  sponsored  research  agreements,  or  SRAs,  with  Penn  for  the  laboratories  of  our
scientific  co-founders,  Drs.  Payne  and  Milone.  Our  continuing  relationship  with  our  scientific  co-founders  provides  important  guidance  and  insights  to  us.  Our  contractual
relationship with Penn through ongoing licensing and research arrangements also provides important services around manufacturing supply.

In  May  2020,  we  amended  and  restated  our  worldwide  license  agreement  with  Penn  to  develop  our  CAAR  T  technology  to  treat  B  cell-mediated  autoimmune  and
alloimmune diseases. This license agreement provides us with access to multiple patent families covering CAAR T therapy as applied to the field of B cell-mediated autoimmune
and alloimmune diseases and to the robust intellectual property portfolio created by Penn under these SRAs in this field. See “—Our Material Agreements—Amended and Restated
License Agreement with Penn.”

Our ongoing collaboration with Penn is also based on a Master Translational Research Services Agreement, or the Services Agreement, that we entered into in October
2018, along with multiple additional agreements under the Services Agreement to engage and partner in individual Penn entities, including cell product manufacturing, correlative
research, vector manufacturing, clinical trial operations and protocol development. In addition to the Services Agreement, we have agreements in place with various functional
areas and centers that provide additional resources to Penn as well as contractual commitments from Penn with the goal of providing the capacity to manufacture our lead product
candidate, DSG3-CAART. Penn has also agreed to manufacture vector product for use in our clinical trials. Penn’s obligations are subject to certain limitations and termination
rights. See “—Our Material Agreements—Master Translational Research Services Agreement with Penn”.

We believe Penn is uniquely suited to be our partner in our efforts to develop product candidates leveraging our CAAR T technology based on a decade of experience,
including manufacturing and clinical support for approximately a dozen active cell therapy clinical trials. The original manufacturing process for the first FDA-approved CAR T
therapy was developed at Penn before being transferred to Novartis Pharmaceuticals Corporation during late-stage clinical trials. We are leveraging Penn’s experience, validated
standard operating procedures, manufacturing facilities and staffing to accelerate development efforts for our lead product candidate.

7

 
Our Strategy

Our goal is to build upon our first mover advantage and expertise in cell therapies for B cell-mediated autoimmune diseases to accelerate the discovery, development and
commercialization of our CAAR T cell therapies, with a focus on reliable manufacturing. We believe achieving this goal could result in potentially curative therapies for patients
with unmet medical needs who suffer from certain B cell-mediated autoimmune diseases. To achieve this goal, key elements of our strategy include:

•

Achieving clinical proof-of-concept for our lead product candidate, DSG3-CAART in mPV, the first in a series of well-understood and validated B cell-
mediated  autoimmune  diseases  for  which  we  are  developing  CAAR  T  cell  product  candidates. It  is  well-established  that  the  presence  of  DSG3
autoantibodies and DSG3 autoantibody producing B cells in patients are both necessary and sufficient to cause mPV in the vast majority of cases. We believe
our biologic understanding coupled with the well-understood clinical signs, symptoms and natural course of the disease, identify mPV as a model disease to
evaluate  our  CAAR  T  approach.  In  addition,  we  have  made  significant  investment  in  the  design  and  development  of  DSG3-CAART,  generating  a  lead
candidate  that  has  demonstrated  robust  target  engagement  and  no  off-target  toxicities  in  preclinical  studies.  Taken  together,  our  Phase  1  clinical  trial
evaluating DSG3-CAART for the treatment of mPV represents an optimal first opportunity to establish initial clinical proof-of-concept of our CABA platform.

8

 
 
•

•

•

Leveraging  our  CABA  platform  to  identify  optimal  targets  for  the  CAAR  T  approach  and  apply  learnings  from  DSG3-CAART  to  advance  additional
product candidates. Shortly after inception, we undertook a comprehensive review of all known B cell-mediated autoimmune diseases in order to evaluate and
prioritize  the  opportunity  for  selective  destruction  of  B  cells  in  an  effort  to  cure  B  cell-mediated  autoimmune  diseases.  Central  to  this  analysis  were
(i)  scientific,  clinical  and  commercial  assessment,  (ii)  epitope  mapping  to  determine  regions  targeted  by  autoantibodies,  (iii)  evaluation  of  the  ability  to
optimize the CAAR construct and design with the goal of selectively ablating reactive B cells, and (iv) evaluation of existing or required development of new
preclinical  models  and in vitro  and in vivo clinical testing. As we performed this analysis of potential product candidates, we considered possible paths for
clinical trial design and regulatory approval. This analysis incorporated the extensive learnings gleaned from years of effort devoted to development of DSG3-
CAART.  We  prioritized  the  targets  and  since  then  have  been  focused  on  being  first  to  discover  and  develop  a  series  of  products  with  each  providing  the
potential  for  cure  of  an  important  B  cell-mediated  autoimmune  disease  in  patients.  We  intend  to  continue  to  apply  our  proprietary  learnings  from  DSG3-
CAART, including scientific and regulatory learnings, to most effectively advance these additional opportunities. Preclinical studies that are generally similar
to, and informed by, DSG3-CAART preclinical studies are actively ongoing with other CAAR T cell product candidates.

Expanding upon our established IP position and first mover advantage in CAAR T therapy targeted towards B cell-mediated autoimmune diseases. We are
focused on protecting our intellectual property as we continue to pursue the development of future product candidates. We believe the issued U.S. patent on our
initial CAAR constructs is the first patent covering cells engineered to express the known pathogenic epitopes recognized by DSG3 and DSG1 autoantibodies,
which we are working to supplement with additional patent filings. The design of a broadly effective CAAR requires a deep understanding of the location of
immunogenic epitopes targeted by autoantibodies, a competency that we believe we are uniquely positioned to utilize in product candidate development. We
believe there is a particularly high value to the first mover advantage including, but not limited to, experience in discovery, preclinical development, regulatory
efforts, intellectual property and insights from clinical trials that can be translated across programs.

Leveraging our cellular therapy experience and knowledge in addition to knowledge gained through our Penn collaboration to rapidly build our own fully-
integrated  internal  infrastructure.  We  have  differentiated  expertise  that  we  believe  is  uniquely  suited  for  the  continued  buildout  of  our  CABA  platform
specializing in B cell-mediated autoimmune diseases. Our scientific co-founders who initially developed our technology continue to collaborate closely with us
through SRAs. In addition, our management team has a successful history of building the capabilities of cell therapy-based companies from the discovery and
preclinical stage through Phase 3 readiness. In combination with our team, which possesses significant experience in executing on manufacturing strategies for
cell  therapy  products,  our  partnership  with  Penn  allows  us  to  utilize  their  existing  infrastructure,  which  accelerated  our  ability  to  submit  our  first  IND.  In
parallel, we continue to build out an experienced team to manage the relationship with Penn while also developing and continuing to implement a path to our
manufacturing  independence.  Ultimately,  we  intend  to  prepare  and  build  our  own  manufacturing  facility  depending  on  the  achievement  of  sufficient  initial
clinical trial data for DSG3-CAART.

9

 
 
 
 
 
B Cell-Mediated Autoimmune Diseases: Overview and Current Treatment Paradigm

The body’s immune system, which is designed to protect the body from infection and cancer, includes B cells and T cells. B cells are responsible for producing antibodies
against  antigens  that  the  body  perceives  as  foreign  whereas  T  cells  are  responsible  for  cell-mediated  immunity.  In  the  case  of  B  cell-mediated  autoimmune  diseases,  certain
populations of the patient’s B cells mistakenly produce antibodies directed against normal tissues and cells, leading to disease. While these autoantibodies are the major effectors of
B  cell-mediated  autoimmune  diseases,  the  underlying  root  cause  of  each  B  cell-mediated  autoimmune  disease  is  the  defective  B  cells  that  mistakenly  make  these  pathogenic
antibodies. These pathogenic B cells express autoantibodies on their surface with the same antigen specificity as the circulating pathogenic autoantibodies, which can be used to
distinguish them from the healthy B cell population, as shown in the figure below.

Antibodies are B cell receptors that drive B cell maturation. CD19 serves as a B cell marker throughout the naïve B cell phase, while CD20 is a surface marker expressed later in
B cell maturation. CAAR T is designed to eliminate antigen specific B cells and prevent their further development to antibody producing plasma cells. IgM: immunoglobulin M;
IgD: immunoglobulin D; IgA: immunoglobulin A; sIg: surface immunoglobulin, representing the autoantibody on the B cell surface.

Current treatment options for autoimmune mediated diseases involve generalized immune suppression, achieved through corticosteroids, immunosuppressive medications
and  biologics.  Most  commonly,  corticosteroids  are  used  on  both  a  chronic  and  acute  basis  to  control  disease,  and  act  via  a  variety  of  mechanisms  to  control  or  downregulate
multiple inflammatory pathways. In many cases, systemic immunosuppressive medications often used in chemotherapy such as mycophenolate, azathioprine and methotrexate, are
added in an effort to minimize symptoms and manage the expected recurrences in patients. Biologic therapies have emerged as a new class of therapies and have a variety of targets
including  cytokines,  B  cells,  and  co-stimulation  molecules.  One  particular  biologic,  rituximab,  is  an  anti-CD20  antibody  and  is  employed  in  multiple  autoimmune  diseases.
Rituximab was approved by the FDA in 2018 for treatment of moderate to severe PV. Currently existing treatment options target parts of the immune system in addition to disease-
causing B cells, and in general require chronic administration to reduce recurrence rates. We believe the ideal therapy in autoimmune diseases would completely and specifically
eliminate the pathogenic B cells while sparing the immune cells that protect against infection, without requiring chronic administration.

Our Approach

Using our CABA platform, we are developing engineered T cell therapy candidates that express CAARs, which serve as “decoys” for antibodies expressed on the surface
of  B  cells.  We  believe  these  CAARs  enable  the  T  cells  to  specifically  engage  and  eliminate  pathogenic  B  cells  while  sparing  normal  B  cells.  By  harnessing  the  power  of  cell
therapy, our technology has the potential to overcome the ability of these B cells to evade elimination and thus lead to durable responses. Our CAAR T platform is based on the
foundation of established CAR T therapeutics, differing primarily in their use of the antigen rather than an antibody fragment to target pathogenic B cells. We

10

 
 
 
believe our technology has broad applicability and we are building a portfolio of product candidates for B cell-mediated autoimmune diseases.

Background: CAR T Cells

Engineered T cell therapy is a type of immunotherapy in which human T cells are genetically modified to express specific receptors, enabling the T cells to recognize and

eliminate pathogenic cells.

A key application of engineered cell therapy involves the use of CARs, which are engineered molecules that enable T cells to identify specific antigens present on the
surface of diseased cells. When expressed on the patient’s T cells, the CAR directs the T cells to kill cells that express a particular antigen. These CAR-expressing T cells, or CAR
T cells, can proliferate, generating memory CAR T cells.

Many companies are using CAR T technology to develop therapies for the treatment of B cell cancers. Several drug candidates have demonstrated clinical success, leading
to the first FDA regulatory approvals of CAR T therapies for certain B cell cancers. In these B cell cancers, CAR T therapy has resulted in complete remission of disease in many
patients, even in cancer patients with severe, refractory disease. Despite success in treating certain B cell cancers, we believe that CARs have not yet been developed or evaluated
as a treatment option for other types of B cell-mediated autoimmune diseases in patients.

Our Technology: CAARs

Our CAAR T platform builds upon the scientific foundation of CARs to enable targeted B cell elimination in an autoimmune setting, which may lead to complete and

durable remission of disease while sparing all other B cell populations that can provide beneficial immunity from infection.

The co-stimulatory domain and the signaling domain of both a CAR T cell and CAAR T cell carry out the same activation and cytotoxic functions once the engineered
cell therapy engages a B cell. Our CAAR T cells differ from CAR T cells primarily in the extracellular targeting domain. Our CAAR T cells incorporate the relevant parts of the
autoantigen that is subject to attack in autoimmune disease, as shown in the figure below.

Key differences between CAR T (left) vs. CAAR T therapy (right). A CAR T cell typically contains a signaling domain and a co-stimulatory domain and incorporates antibody
fragments that recognize a specific antigen, such as CD19, which is present in both B cell leukemia cells and healthy B cells. In contrast, a CAAR T cell typically contains an
antigen as its targeting domain rather than an antibody fragment. The antigen is recognized by the specific, pathogenic antibody along with the limited population of B cells that
produce the antibody. The model

11

 
 
 
CAAR T cell depicted here contains an identical signaling domain and a co-stimulatory domain. The primary difference between a CAR T cell and a CAAR T cell is the target
domain expressed on the cell surface. The example shown demonstrates the pan-B cell ablation that happens when targeting the B cell lineage marker, CD19, and the highly
selective pathogenic B cell targeting approach of CAAR T.

Potential Advantages of CAAR T Cell Therapy in B Cell-Mediated Autoimmune Diseases

In contrast to currently available therapies for B cell-mediated autoimmune diseases, based on observations of CAR T activity in refractory B cell cancers, we believe a
single CAAR T treatment could potentially offer complete and durable remission of certain specific B cell-mediated autoimmune diseases while leaving the humoral, or bodily
fluid, antibody-producing immune system intact. We believe our CAAR T cells can recognize the specific autoantibodies that are responsible for causing an underlying disease and
kill the cells that express the autoantibodies on their surface. As a result, we believe CAAR T cell therapy used in B cell-mediated autoimmune disease has the potential for durable
elimination of pathogenic B cells and an associated elimination of clinical recurrences with an improved adverse event, or tolerability, profile relative to the current standard of
care.

Enhanced target specificity and preservation of humoral immune system

Preservation of the humoral immune system with CAAR T cell therapy represents a potentially meaningful benefit over existing CD19- or CD20-targeting methods for B
cell ablation, as patients would be less susceptible to infection they may encounter after non-specific B cell elimination and would not require chronic in-hospital treatment with
intravenous immunoglobulin, or IVIG, or other prophylactic therapies. Additionally, because self-reactive B cells make up only 0.01% to 1% of the normal B cell population, we
believe the risk of on-target toxicity may be reduced compared to systemically immunosuppressive medications that non-specifically weaken the immune system. Continued use of
these drugs poses significant risks, such as the potential for fatal infections due to the non-specific tempering of the immune system related to the complete depletion of CD20+ or
CD19+ B cells.

Potential for complete, long-lasting elimination of pathogenic B cells

The current standard of care for B cell-mediated autoimmune disease displays limited and transient therapeutic benefit while also weakening the humoral immune system.
We believe our CAAR T cells have the potential to eliminate the reactive, antibody-producing B cells that are ultimately responsible for disease, while sparing normal B cells. The
curative potential of CAAR T cells would be consistent with clinical findings from use of CAR T products in B cell cancers and would be a significant improvement relative to the
current standard of care for certain B cell-mediated autoimmune diseases.

While CAR T has demonstrated significant clinical success in B cell cancers, cancer cells employ a variety of mechanisms to evade detection by targeting immune cells,
and antigen escape poses a significant risk of failure for CAR T cell treatment in oncology. Antigen escape in CAR T treatment occurs when the antigen that the CAR T cell targets
is lost from the malignant cell. Clinically, this results in response rates that decline from an initial complete response level of about 80% to approximately 50% over a period of
years.

We believe this risk of antigen escape is reduced in our setting as mechanisms to evade CAAR T therapy would involve B cell receptor down-regulation or mutation such
that antigen specificity is lost. We believe that the implication of this is that the mutated B cell would no longer produce autoantibodies that recognize the antigen and therefore
should no longer be pathogenic. We also believe that a single infusion of CAAR T cells has the potential for curative effects due to either complete ablation of pathogenic cells or
production of memory CAAR T cells.

12

 
Our CABA Platform

Our team has developed our CABA platform to inform product candidate development from indication selection through preclinical studies. Using our CABA platform,
our  team  has  identified  our  highest  priority  target  indications  following  a  rigorous  analysis  of  B  cell-mediated  autoimmune  diseases. A  deep  understanding  of  the  antigenic
epitopes targeted in these diseases is required to design and construct a successful CAAR. Our scientific founders have studied B cell repertoires for many years in the context of
PV. Their expertise is essential to provide insights and guidance regarding our portfolio of products. We leverage the experience and insight gained from the development of each
product candidate to improve the efficiency of our CABA platform in evaluating additional potential product candidates.

Scientific, Clinical and Commercial Assessment

Through broad literature review and consultation with internal and external experts, we have identified and continue to monitor the universe of diseases where pathogenic
B cells are implicated in disease pathophysiology. From this set of possible indications, our team then evaluates each disease based on numerous criteria, which include, but are
not limited to:

Biologic Opportunity for Cure

•

•

•

•

•

the presence of the antibody is well established in patients with the clinical manifestations of the disease;

the identified antibody has been shown to be necessary and sufficient in causing clinical disease;

there is a correlation between antibody titer and disease activity;

B cell-depleting therapies are shown or believed to be effective in treating the disease;

the antibody repertoire has been or can be characterized for the disease;

Identifiable and Underserved Patient Populations

•

•

•

a routine and established antibody test exists or can be developed for diagnosis and biomarker assessment;

the clinical course and severity of the disease warrant a cellular therapy despite current standard of care;

products in development do not have the potential to materially improve outcomes versus the current standard of care;

13

 
 
 
 
 
 
 
 
 
 
 
Evaluation of Preclinical and Clinical Development Pathway

•

•

preclinical in vitro and in vivo models exist or can be developed; and

potential clinical trial designs and endpoints appear reasonable and achievable.

In addition to assessing the underlying biologic and clinical rationale for each potential target, we also assess commercial feasibility of CAAR T therapy in various B cell-
mediated  indications. As  part  of  this  assessment,  we  evaluate  the  direct  lifetime  drug  and  overall  healthcare  costs  due  to  the  burden  from  the  disease,  including  the  costs  of
managing potential adverse effects from existing standard of care compared to the potential CAAR T therapy.

We perform this rigorous and detailed conceptual analysis to enable us to be thorough and thoughtful before committing significant resources to a program. We believe

this analysis allows us to prioritize and advance potential product candidates through the CABA platform with a higher degree of confidence and a higher probability of success.

Epitope Mapping

Epitope mapping involves identifying specific sites on the antigen that are responsible for binding to the antibody of interest. This step is required in order to facilitate an
understanding of CAAR design and feasibility. An understanding of the locations of the key immunogenic epitopes on the antigen heavily informs the potential feasibility of a
CAAR. With an understanding of these epitopes, we then leverage our cell therapy expertise to design the CAAR construct.

CAAR Construct / Design

Our  scientists  and  collaborators  design  and  create  multiple  CAAR  constructs  following  completion  of  epitope  mapping,  which  are  tested  against  the  antibody  or
antibodies of interest. The goal in CAAR design is to maximize the inclusion of known immunogenic epitopes on the antigen while also optimizing the size of the construct to
improve the ability of the CAAR to bind to the antibody. Determining the location of antigen expression and if there are other antigens that may unintentionally cross-react with the
CAAR will also inform CAAR design and feasibility. The size of the antigen will also determine whether a CAAR can be designed based on the size constraints of the delivery
system. Once we have designed and developed optimal CAAR constructs, we test them in a variety of in vitro and in vivo studies.

In Vitro and In Vivo Testing

In vitro  preclinical  testing  is  focused  on  establishing  the  specificity  and  activity  of  the  potential  CAAR  T  cell  product  candidate  against  B  cells  expressing  known
pathogenic target antibodies. Specificity is evaluated against non-target membrane proteins that may be expressed on other cells, with specific focus against any proteins that are
known to bind to the antigen presented on the CAAR. CAAR T function is tested in the presence and absence of soluble, or free, antibodies isolated from patients, since these
antibodies may enhance or inhibit CAAR T cell function. Where relevant animal models exist, the CAAR T cell product candidate is tested in one or more models to address
specific questions around safety and the ability of the potential product candidate to reduce disease activity in vivo.

Pipeline

We are developing a portfolio of CAAR T cell product candidates for the treatment of B cell-mediated autoimmune diseases. Our lead product candidate, DSG3-CAART,
targets B cells that express pathogenic autoantibodies against the DSG3 protein, which cause mPV. The publication of the first  in vivo evaluation of activity and toxicity of the
candidate in an animal model was followed by additional preclinical studies to support our IND submission, which was cleared by the FDA in September 2019 The FDA granted
our lead product candidate, DSG3-CAART, designed to treat patients with mPV, orphan drug designation for the treatment of PV in January 2020 and fast track designation for
improving healing of mucosal blisters in patients with mPV in May 2020. We initiated our DesCAARTes™  trial in June 2020 and announced the dosing of the first patient in
December 2020. Our next PV-directed product candidate, DSG3/1-CAART, targets B cells that give rise to pathogenic autoantibodies against either the DSG3 or DSG1 protein,
which cause mcPV, and could address a broader PV population.

14

 
 
 
Our second product candidate, MuSK-CAART, targets B cells that give rise to pathogenic autoantibodies against the MuSK receptor in patients with MG. An additional
product candidate, FVIII-CAART, targets B cells that produce alloantibodies against exogenous FVIII in Hemophilia A patients who consequently require repeated and increased
exogenous  FVIII  administration. In  May  2020,  we  expanded  our Payne SRA  to  include  CAAR  design  and  optimization  efforts  in  three  additional  B  cell-mediated  autoimmune
diseases. We are exploring additional CAAR T cell product candidates that will focus on patients with B cell-mediated autoimmune diseases with well-defined antibody targets.

Our Product Candidates

DSG3-CAART for Mucosal PV

Our lead product candidate, DSG3-CAART, is a CAAR T cell therapy expressing DSG3 antigen epitopes as the extracellular domain of a chimeric immunoreceptor, and
is  designed  to  enable  specific  cytotoxicity  toward  B  cells  with  DSG3  autoantibody  targeting  abilities.  We  believe  this  strategy  has  the  potential  to  enable  direct  elimination  of
DSG3 autoantibody memory B cells and indirect elimination of DSG3-specific short-lived plasma cells that produce the pathogenic autoantibodies.

Scientific, Clinical and Commercial Assessment

PV  is  a  potentially  fatal,  chronic  autoimmune  disease  characterized  by  acantholysis,  which  is  the  loss  of  adhesion  between  cells  of  the  skin  or  mucous  membranes.
Desmosomes  are  a  collection  of  proteins  that  provide  the  structure  for  epithelial  cells  to  connect  with  each  other.  PV  results  when  specific  pathogenic  autoantibodies  disrupt
desmosomes by targeting DSG3 and/or DSG1, which are proteins that are part of the desmosomes. These autoantibodies cause the upper layer of the epidermis to split away from
its base resulting in characteristic erosions and blisters. Widespread damage to the skin and mucous membranes increases susceptibility to life-threatening systemic infections. PV
has two major subtypes:

•

•

mPV—Characterized by DSG3 autoantibodies only, affecting only mucosal surfaces—accounts for approximately 25% of PV

mcPV—Characterized by DSG3 autoantibodies and DSG1 autoantibodies, affecting both mucosal and cutaneous surfaces—accounts for approximately 75% of
PV

15

 
 
 
 
The presence of DSG-specific antibodies is 98% to 100% sensitive and specific in identifying patients with PV, and these antibodies have been deemed both necessary
and sufficient to cause the disease. Thus, in the absence of DSG autoantibodies, PV generally does not occur. In mPV, patients will typically develop painful skin blisters on their
mucosal  membrane  surface,  including  mouth,  nose,  throat,  genitals,  and  other  orifices,  often  leading  to  an  inability  to  eat,  drink  and  function  normally.  The  pathogenic  DSG3
autoantibody is made by a specific small number of aberrant B cells, which express the DSG3 autoantibody on their surface. An overview of mPV and mcPV is provided in the
figure below.

Visual evidence of clinical manifestations of PV. (Left panel) Inside of cheek of a patient with mPV, showing sloughing mucosa and blistering. (Right panel) Back of a patient
showing cutaneous skin blistering and sloughing in a patient with mcPV. Image credit: D@nderm.

Like most autoimmune  diseases,  the  current  standard  of  care  for  PV  relies  on  general  immune  suppression,  which  is  often  transiently  effective  but  can  lead  to  severe
infection, potentially resulting in hospitalization and death. First-line therapy for PV typically consists of corticosteroids in moderate to high doses in combination with the anti-
CD20  monoclonal  antibody  rituximab  where  clinically  appropriate.  Second-line  therapy  focuses  on  the  several  systemically  immunosuppressive  medications  such  as
mycophenolate, azathioprine and methotrexate. Additional options used in the acute setting with severe disease presentation include plasmapheresis, or infusions of intravenous
immunoglobulin.

B cell depletion with rituximab was approved by the FDA for the treatment of PV in 2018 and is playing an increasing role as part of the standard of care because it has
proven to be one of the more effective therapies for PV. However, data suggest that a significant number of patients treated with rituximab will relapse with or without chronic
therapy.  Despite  its  recent  approval  for  use  as  an  adjuvant  therapy  with  corticosteroids  in  PV,  rituximab  has  several  limitations  in  terms  of  efficacy,  safety  and  convenience.
Rituximab treatment frequently results in relapse, which is reduced but still occurs despite chronic treatment every six months in PV. It does not specifically target the pathogenic B
cells, but rather it depletes all CD20-expressing B cells, which leads to an ongoing risk of severe infection and death. As such, there remains not only an unmet medical need in PV,
but also a need for safer therapies that can provide a reliable, durable and complete remission off of all other medications.

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There  are  several  emerging  therapies  also  being  developed  for  the  treatment  of  PV,  which  are  being  evaluated  in  late-stage  clinical  trials.  These  therapies  provide
important alternative therapeutic options for patients; however, we believe based on early published data that these therapies are unlikely to be curative and do not specifically
ablate autoantibody producing B cells.

Epitope Mapping

DSG3 consists of five extracellular cadherin, or EC, domains as shown schematically in the figure below. Since T cell activation depends on the intermembrane distance
of the immunologic synapse, we tested different combinations of ECs for expression in primary human T cells using DSG3 fragments as the extracellular domain as shown in the
figure below.

Image showing the naturally occurring DSG3 protein and the five EC domains. (B) The CAAR constructs that were evaluated in preclinical studies, containing the whole or
subsets of the DSG3 protein. The transmembrane and intracellular signaling domains are identical to those in the CART19 studies published by Penn.

CAAR Construct / Design

The DSG3 EC1-5 CAAR was minimally functional, likely due to the extracellular domain being too large to enable CAAR function or aggregation of the CAAR on the T
cell surface. The CAAR designs with either DSG3 EC1-3 or DSG3 EC1-4 showed interferon-gamma production after exposure to the target cells, demonstrating specific cytotoxic
activity across targets. In addition, no cytokine production was detected after exposure to cells that did not express surface immunoglobulins or other non-target cells.

17

 
 
 
The DSG3 EC1-3 was not effective against one target cell known to bind to the DSG3 EC3-4 domain. Together, this data suggests that the DSG3 EC1-4 CAAR is the

optimal construct to balance activity while retaining the ability to target locations of known pathogenic antibodies, as shown in the figures below.

Cytotoxicity assay to assess killing activity of DSG3 CAART. Negative control is a CAR T with an antibody fragment attached to the extracellular domain. * indicates construct that
was selected for further development. E:T ratio = effector to target ratio.

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In Vitro Studies

A  variety  of in vitro  studies  were  conducted  to  evaluate  DSG3-CAART  from  a  preclinical  activity  and  toxicity  perspective.  These  studies  included  an  evaluation  of
DSG3-CAART against proteins that are known to bind the DSG3 antigen, a screen of DSG3-CAART against an array of other membrane proteins and a set of studies designed to
evaluate the potential effects of soluble DSG3 antibodies against DSG3-CAART. The results of these studies are summarized below.

Evaluation of DSG3-CAART reactivity against known DSG3 binding proteins. The DSG3 antigen presented on the extracellular domain of DSG3-
CAART may naturally bind proteins in the body. These proteins may bind to and activate DSG3-CAART, potentially causing toxicity. The native binding proteins
for DSG3 are the desmocollin proteins, which are important for cell adhesion in the skin and mucosa. We performed a variety of studies to test whether DSG3-
CAART recognizes and activates the desmocollin proteins. Epithelial cells isolated from various primary organ systems that express some level of desmocollin
proteins were screened. Potential DSG3-CAART activity was evaluated through the detection of cytokines released against each cell type and cytotoxicity. The
data demonstrated an absence of inflammatory T cell cytokines after being exposed to these cells, indicating an absence of T cell activation. No cytotoxicity was
detected except at very high, non-pharmacologically feasible doses. Collectively, we believe there is sufficient evidence to suggest that the DSG3 protein in the
context of a CAAR does not meaningfully interact with desmocollin proteins.

Evaluation of DSG3-CAART off-target binding against membrane proteins. A membrane protein array was utilized to screen the DSG3-CAART
extracellular domain against 5,300 membrane proteins, which encompass the approximate number of membrane proteins contained in the human genome. The
confirmatory screen yielded no off-target signals, except for one weak signal against a protein that is known to bind to glycoproteins, and which was detected in
both the test and control conditions. Further evaluation of this protein in cell-based assays indicated that DSG3-CAART does not recognize and activate against
this protein.

Evaluation  of  the  effect  of  soluble  antibodies  on  DSG3-CAART  function.  We  expect  that  circulating  antibodies  may  prompt  an  active  immune
response against treatment with CAAR T cell therapy. These antibodies can induce proliferation of DSG3 CAAR T cells but may also neutralize the cells. In our
preclinical in vitro studies, we observed that while DSG3 antibodies may have a variable effect on CAAR function, there was no systematic effect to enhance or
reduce CAAR function. These dynamics were evaluated in a series of in vitro studies as follows:

•

•

•

Soluble DSG3 antibodies were added to CAAR T cell cytotoxicity assays, at a range of concentrations likely to be encountered in patients, to
assess  the  impact  on  CAAR  function.  In  all  cases  when  the  CAAR  T  cells  were  tested  in  the  presence  of  soluble  DSG3  antibodies,  they
retained  their  killing  function.  In  addition,  the  presence  of  antibodies  did  not  demonstrate  a  systematic  effect  to  enhance  or  reduce  the
CAAR T cells’ cytotoxic ability. Therefore, we believe that removal of circulating soluble DSG3 antibodies from patients prior to infusions
may not be necessary to enable potential benefit.

Monoclonal  DSG3  antibodies  with  an  enhancing  effect  were  evaluated  in  combination  with  PV  patient  serum  to  assess  their  impact  on
DSG3 CAAR T cell division and stimulation of cytokine production. Monoclonal DSG3 antibodies were capable of inducing DSG3 CAAR T
cell division and stimulated production of moderate levels of cytokine production, as measured by interferon gamma. Therefore, we believe
the presence of DSG3 autoantibodies in patients may contribute to the DSG3 CAAR T cell population expansion post-infusion.

Antibodies purified from PV patients were added to DSG3 CAAR T cells at a range of concentrations known to commonly occur in patients
in order to evaluate the extent to which patient serum may activate CAAR T cells. These antibodies induced a dose dependent increase in
interferon gamma.

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•

Off-target toxicity may also be seen due to antibody-mediated bridging of DSG3 CAAR T cell cytotoxicity against hematopoietic cells that
express receptors designed to bind to antibodies, known as Fc receptors. To evaluate this, we loaded DSG3 antibodies onto cells expressing
antibody-binding receptors, and evaluated the ability of DSG3 CAAR T cells to bind and activate against these targets in vitro. No evidence
of cytotoxicity was observed, suggesting the potentially low risk of off-target killing mediated by this mechanism.

In Vivo Studies

To evaluate DSG3-CAART in vivo, four murine models were used. These models were designed to directly compare the potency of DSG3-CAART in comparison with

CART19 cells; evaluate the potential for on-target skin toxicity; and measure the activity of DSG3-CAART in the presence of polyclonal soluble DSG3 antibodies.

•

•

•

Evaluation of potency of DSG3-CAART in a human B cell tumor line compared to CART19 cells. This B cell model contained genetically-modified B
cells to express DSG3 antibodies on the cell surface in addition to luciferase, a bioluminescence marker, and allowed evaluation of DSG3-CAART’s
ability to engage and kill B cells that express the pathogenic antibody. CART19 cells were used as a positive control in  this  model  as  the  B  cells
express CD19 on their cell surface. In this model, DSG3-CAART was found to result in a similar reduction of B cells compared to the CART19 cells.

Evaluation of on-target skin toxicity mediated by DSG3-CAART. A human skin-xenografted model was used to evaluate the potential skin toxicity of
DSG3-CAART by evaluating if the extracellular domain would react with desmocollin proteins, which are the known target for DSG3. These results
were compared directly to a positive control CAR T expressing a DSG3 specific antibody as an extracellular domain. In this model, we observed the
absence of skin toxicity mediated by the DSG3-CAART cells compared to the positive control, which did demonstrate skin toxicity.

Evaluation of DSG3-CAART in the presence of soluble antibodies. We also tested a model where mice have circulating DSG3 antibodies to mimic the
situation in PV patients. In this model, the DSG3 antibodies have well-defined and different epitopes with varying affinities, which may reflect the
potential breadth of B cell targets that could be encountered in PV patients. The mice were then treated with DSG3-CAART, which was compared to
non-CAAR expressing T cells, or negative control CAR T cells. In this model, we observed amelioration of disease (see figure A below), reduction of
DSG3 antibody titers (see figure B below), as well as control of the pathogenic B cells (see figure C below), by DSG3-CAART. In this model, DSG3-
CAART  also  demonstrated  dose-related  activity,  particularly  in  regard  to  reduction  of  serum  autoantibodies,  epithelial-bound  autoantibodies  (not
shown in Figures) and DSG3-CAART engraftment, suggesting that higher DSG3-CAART doses may promote engraftment (see Figures D and E).
We believe these results show the functional activity of DSG3-CAART in the presence of soluble antibody.

20

 
 
 
 
 
 
Histology showing DSG3 CAAR maintaining normal epithelial cell structure in treated animals.

OD450 is a proxy measure for anti-serum DSG3antibodies in the blood. * indicates statistically significant reduction in DSG3 serum antibody level in DSG3-CAART treated mice.
P value is < 0.05. *** indicates statistically significant increase in DSG3 serum antibody level in the negative control CAR treated group. P value is < 0.001.

21

 
 
 
 
Total flux is a quantitative measure of cell bioluminescence, which approximates cell activity in this assay.

D

OD450 is a proxy measure for the level serum anti-DSG3 antibodies in the blood. Serum anti-DSG3 ELISA was performed on day 10 for all mice with remaining serum samples
available, indicating that mice treated with the 3x107 and 1x107 DSG3-CAART dose effectively reduced serum anti-DSG3 IgG production compared to mice treated with NTD T-
cells or the 3x106 DSG3-CAART dose.** indicates statistically significant reduction in DSG3 serum antibody level in DSG3-CAART treated mice. P value is < 0.01. * indicates
statistically significant increase in DSG3 serum antibody level in the negative control CAR treated group. P value is < 0.05. ns indicates a non-significant difference.

22

 
 
 
 
 
Quantification by flow cytometry of CD3-positive T-cells in peripheral blood on day 10 and 17 is shown.  The data support dose-related DSG3-CAART engraftment

based on increased CD3+ cells with increased DSG3-CAART dose.

•

Evaluation of DSG3-CAART in an active immune model. An exploratory active immune mouse model for PV was developed to better represent the
human phenotype in autoimmune disease. This model involved generating anti-DSG3 B cells in a mouse without DSG3 by repeated immunization
with  human  DSG3.  Splenocytes  containing  anti-DSG3  B  cells  from  the  immunized  mouse  were  transferred  into  an  immunodeficient  mouse  to
generate the PV phenotype. These mice produced DSG3 antibodies against multiple extracellular domains of the DSG3 antigen, including EC5, at
physiologic  levels  comparable  to  those  observed  in  PV  patients.  Treatment  with  DSG3  EC1-4  CAAR  T  cells,  in  the  absence  of  preconditioning,
effectively  lowered  serum  DSG3  antibody  levels  by  ELISA,  reduced  antibodies  against  relevant  DSG3  domains  by  epitope  mapping  and  reduced
blistering by histology. These mice retained autoantibodies targeting the DSG3 EC5 region, though the mice did not show clinical manifestations of
PV.

•

See figure F below for a schematic representation of the experiment.

F

Schematic representation of the PV active immune model. A DSG3 knockout mouse is immunized with DSG3 EC1-5. The knockout mouse develops antibodies against DSG3 across
all EC domains. The splenocytes from the knockout mouse are transferred to an immunodeficient mouse where the DSG3 antibodies cause a clinical phenotype consistent with PV.
Those mice are then treated with DSG3-CAART (EC1-4 domains only).

Clinical Development Plan

The FDA cleared our IND for a Phase 1 trial of DSG3-CAART in September 2019. The FDA granted DSG3-CAART orphan drug designation for the treatment of PV in
January  2020  and  fast  track  designation  for  improving  healing  of  mucosal  blisters  in  patients  with  mPV  in  May  2020.  We  announced  that  the  first  patient  was  dosed  in  the
DesCAARTesTM trial in December 2020. The DesCAARTesTM trial is an open-label trial to assess the safety and tolerability of various dosing regimens of DSG3-CAART in the
treatment of subjects with active mPV. DSG3-CAART will be administered by intravenous infusion, using a fractionated-dose infusion scheme of escalating numbers of DSG3-
CAART cells for the initial cohorts in the first phase. This dosing scheme is designed to reduce the potential risks associated with acute infusion-related toxicities while preserving
potential benefit for subjects by

23

 
 
 
 
 
 
 
allowing a total infused dose that we believe is large enough to be potentially therapeutic based on prior CAR T trials.

We expect that the Phase 1 trial will have three parts:

•

•

•

Part A: Fractionated dose escalation

Part B: Fractionation reduction at the selected dose

Part C: Expansion phase at the selected dose and administration scheme

In Part A, the split dose uses dose fractionation to accommodate a low number of cells in the first infusion while still advancing the dose within the cohort up towards and
spanning the range of cell doses that have been therapeutic in past gene-engineered T cell therapy trials. In Part B, the dose selected from Part A will be delivered in a decreasing
number of dose fractionations to determine the dose fractionation strategy. In Part C, subjects will be enrolled at the dose and fractionation, as determined in Part A and B, to
generate additional safety and outcome data to support the rationale for and design of future clinical trials.

Patients  are  eligible  to  be  enrolled  if  they  have  a  confirmed  diagnosis  of  mPV  based  on  biopsy  for  histology  and  positive  DSG3  ELISA;  active  disease  at  screening;
elevated DSG3 by ELISA at screening; and previously been inadequately managed by, or refractory to, or relapsed after, or with contraindications to or intolerance of at least one
prior systemic therapy. The primary objective of the trial is to evaluate the safety of DSG3-CAART cells, and secondary objectives include evaluating the initial signs of target
engagement.

We  believe  the  risk  of  cytokine  release  syndrome,  or  CRS,  a  potentially  life-threatening  toxicity  that  has  been  observed  after  treatment  with  some  types  of
immunotherapy, may be reduced with our CAAR T cells, due to its correlation with target cell burdens. In the context of treating cancer, the target cell population consists of all B
cells (healthy and cancerous), whereas our CAAR T cells only target the small subset of disease-causing reactive B cell population. While the possibility of cytokine release in a
clinical trial resulting from strongly activating soluble antibody cannot be ruled out, to date we have not observed any evidence of it in preclinical studies.

The primary endpoint of the study is the incidence of adverse events within three months of DSG3-CAART infusion, including dose limiting toxicity defined as occurring
within 28 days of infusion. The FDA has requested, and we have agreed, that we will share data from cohort A to inform a discussion on the optimal design of cohort C. According
to FDA guidance, the submission of cohort A data is not gating to planned enrollment in cohort B and the FDA plans to provide feedback, if any, in a timely manner. In addition,
we plan to report on acute tolerability data on no less than a cohort basis, which is defined to include adverse events within eight days following DSG3-CAART infusion. We
believe  the  eight-day  timeframe  appropriately  covers  the  period  of  time  when  one  would  expect  the  onset  of  CRS  in  most  subjects.  We  also  currently  intend  to  communicate
serious adverse events once we have sufficient understanding of the events, if they materially change timelines or the trial design.

We also expect to provide updates from time-to-time related to target engagement in subjects receiving DSG3-CAART typically only once data is available for a full
cohort. Although possible but not expected in the lower dosing cohorts, we believe target engagement could be observed if DSG3 autoantibody titer falls within six months after
DSG3-CAART  infusion  in  addition  to  other  parameters  of  engraftment  and  target  engagement  that  will  be  monitored  regularly.  Clinical  responses,  including  improvement  or
resolution of mucosal lesions and absence of new lesions will also be evaluated.

DSG3/1-CAART for mcPV

Scientific and Commercial Assessment

Our next PV product candidate, DSG3/1-CAART, is being designed to target DSG3 and/or DSG1 autoantibodies on pathogenic B cells that cause mcPV. mcPV is the
most severe and most common subtype of PV and affects approximately 75% of PV patients. While mPV is caused by DSG3 autoantibodies, mcPV involves autoantibodies to both
DSG3 and DSG1, resulting in the additional involvement of skin erosion and blistering.

24

 
 
 
 
Similar to mPV, mcPV is typically treated with immune suppression, which has a high rate of relapse and potential for hospitalizations and fatal infections.

Epitope Mapping

DSG1 consists of five EC domains, with all known pathogenic epitopes occurring in the DSG1 EC1-4 domains. Similar to development of DSG3-CAART, we tested
different combinations of DSG1 ECs for expression in primary human T cells using DSG1 fragments as the DSG1 EC domains. Given prior development of DSG3 CAAR, we
leveraged those findings in the design of our DSG1 CAAR.

CAAR Construct / Design

We also tested multiple combinations of EC domains of DSG1 CAAR administered alone and in combination with the DSG3 EC1-4 CAAR to evaluate for cell-surface
expression of the CAAR along with the potency and breadth of target cell killing. In this setting, the DSG1 EC1-4 CAAR showed robust and specific cytotoxicity towards all
known pathogenic epitopes.

In Vitro Studies

CAAR development for mcPV, based on the targeting of DSG3- and/or DSG1-specific B cells, has shown promising preclinical results. DSG1 CAAR T cells specifically
killed DSG1-specific B cells in vitro. In addition, we observed that with a 1:1 mixture of DSG3 and DSG1 CAAR T cells had killing capabilities without synergistic or antagonistic
effect.

In Vivo Studies

The activity and toxicity of DSG3 and DSG1-CAAR T cells was evaluated using human skin xenografts in comparison with anti-CART19 cells, which are known from

human clinical trials not to cause direct skin toxicity. A 1:1 mixture of DSG3 and DSG1 CAAR T cells did not show off-target toxicity in vivo.

Development Plan

From a regulatory and clinical trial design perspective, we anticipate that many of the elements incorporated into the planned DesCAARTesTM  trial  will  carry  over  to
DSG3/1-CAART.  We  plan  to  evaluate  the  initial  cohorts  of  patients  from  the  planned  DesCAARTes TM  trial  to  evaluate  for  safety  and  evidence  of  target  engagement  prior  to
proceeding with an IND submission for DSG3/1-CAART. We believe that, because mcPV is the most prevalent subset of PV and the patients are generally followed by the same
subspecialists, it will allow for a wider patient pool eligible for a clinical trial. We anticipate the DSG3/1-CAART clinical trial protocol will have a significant amount of overlap
with the DSG3-CAART protocol, but it will be informed by clinical data from the early cohorts in the DesCAARTes TM trial. We further anticipate being able to use the same
centers from the DesCAARTesTM trial to enroll patients for the DSG3/1-CAART clinical trials.

We are currently evaluating advanced manufacturing technologies that would potentially allow us to administer DSG3/1-CAART as a single product rather than requiring
separate  administration.  The  size  of  the  DSG3/1  product  candidate  will  likely  require  us  to  incorporate  additional  technologies  to  accommodate  the  size  of  the  final  CAAR
construct. An evaluation of potential technologies to achieve this objective is ongoing. Upon completing the evaluation of these manufacturing technologies, we expect to conduct
additional in vitro and in vivo studies using the combined product. While a product that administers a DSG3 CAAR and DSG1 CAAR as two separate products may be feasible, we
believe that there would be significant advantages to developing a combined product from a regulatory and commercial perspective.

25

 
MuSK-CAART for MuSK Myasthenia Gravis

Scientific, Clinical and Commercial Assessment

MG is an autoimmune disease induced by autoantibodies targeting the neuromuscular junction, or NMJ, which can lead to life-threatening muscle weakness. Generalized
MG, or gMG, is characterized by profound muscle weakness throughout the body, resulting in motor impairment, disabling fatigue, shortness of breath due to respiratory muscle
weakness and episodes of respiratory failure.

gMG affects approximately 50,000 to 80,000 patients in the United States. The majority of patients who develop gMG have autoantibodies against some part of the NMJ
that are known to be pathogenic. 80% to 90% of patients with gMG have autoantibodies against the acetylcholine receptor, or AchR, detectable in their serum. Approximately 6%
to 7.5% of patients with gMG have autoantibodies against MuSK, which is a different target on the surface of the muscle membrane.

Patients diagnosed with MuSK MG have a different recommended treatment course compared to patients with AchR MG. Importantly, many patients with MuSK MG
respond poorly to cholinesterase inhibitors, which are often the first line of therapy in AchR MG. In that setting, patients with MuSK MG are typically started on corticosteroids in
addition to one or more steroid-sparing immunosuppressive agents. Corticosteroids are tapered to the extent possible to prevent disease relapse, though many remain dependent on
corticosteroid despite concomitant treatment with immunosuppressive medications. In the acute setting, plasmapheresis or intravenous immunoglobulin may be used to address
severe disease. Rituximab is often considered as a second-line therapeutic option in patients with an inadequate response to initial immunosuppressive medications. Importantly,
complement is not thought to be meaningfully implicated in the pathophysiology of MuSK MG, and complement inhibitors are not indicated for treatment of disease.

Epitope Mapping

The MuSK protein has a similar structure and size as compared to DSG3. MuSK contains four extracellular domains, as shown below.

Figure illustrating the domains of the wild-type MuSK protein.

26

 
 
 
Studies conducted in patients with MuSK MG have revealed that the autoantibodies may be against epitopes located in each of the extracellular domains for MuSK.

CAAR Construct and Design

With an understanding that pathogenic autoantibody epitopes may target any domain of MuSK, multiple MuSK CAAR candidates have been engineered that incorporate

all extracellular domains. Each CAAR construct is being or will be tested in preliminary in vitro and in vivo experiments.

In Vitro Studies, In Vivo Studies and Development Plan

Data from our initial in vitro and in vivo studies of MuSK-CAART was presented at the American Academy of Neurology’s Science Highlights Virtual Platform in May
2020. The efficacy and safety of MuSK CAAR T cells were investigated using in vitro cytotoxicity assays, in vitro screens for off-target toxicity and a mouse model to evaluate the
efficacy of human MuSK CAAR T cells against MuSK antibody expressing B cells in vivo. In preclinical studies, MuSK CAAR T cells containing the native MuSK extracellular
domain  demonstrated  in  vitro  cytotoxicity  towards  a  panel  of  B  cells  expressing  anti-MuSK  antibodies  specific  for  different  extracellular  regions  of  the  MuSK  protein,  but  no
observed cytotoxicity when anti-MuSK antibodies are not expressed (figure below). Additionally, MuSK CAAR T cells did not demonstrate cytotoxicity toward cells expressing
LRP4, which is a different protein in the neuromuscular junction that can bind with naturally occurring MuSK in certain configurations.

Figure illustrating that MuSK-CAART, which contains the native MuSK extracellular domain, demonstrated selective and specific in vitro cytotoxicity towards a B cell
line expressing anti-MuSK antibodies targeting different MuSK epitopes across multiple domains of the native MuSK protein. The specific lysis increases directly with increasing
effector to target ratios for MuSK-CAART.

27

 
 
 
As illustrated in the figure below, in an in vivo mouse model, MuSK CAAR T cells, but not control CAAR T cells, showed biological activity by blocking the growth of B

cell lines expressing an anti-MuSK antibody.

Figure illustrating MuSK CAAR T cells are able to recognize and suppress anti-MuSK target cells in a murine model. The target cells express both CD19 and anti-MuSK

B cell receptors, and CART19 is used as a positive control in this experimental system.

Based in part on these results, IND-enabling studies were initiated for the MuSK-CAART product candidate. An IND submission is anticipated in the second half of 2021

for MuSK-CAART.

FVIII-CAART for Hemophilia A with Factor VIII Alloantibodies

While  our  CABA  platform  is  primarily  directed  towards  the  treatment  of  B  cell-mediated  autoimmune  diseases,  we  believe  the  approach  may  be  applicable  in  other
instances  where  B  cell  antibody  production  is  implicated.  Specifically,  we  have  identified  an  opportunity  to  apply  the  CABA  platform  to  develop  potential  CAAR  adjunctive
therapies in cases where the immune system has or produces antibodies against potential therapies, which is known as an alloimmune response. These alloantibodies can prevent a
particular therapy from being delivered effectively because the therapy is degraded by the immune response due to alloantibody binding. We believe our approach has the potential
to address the alloantibody response by specifically ablating the B cells responsible for producing the alloantibodies through a similar mechanism seen in autoimmune disease. With
the alloantibody producing cells ablated, the treatment could then be provided.

Scientific, Clinical and Commercial Assessment

Hemophilia A is an X-linked bleeding disorder caused by mutations in the FVIII gene resulting in a deficiency of functional FVIII, a critical factor in blood coagulation.
It affects about 1:5,000 male births. Severe Hemophilia A, where FVIII levels are less than 1% of normal, accounts for about 60% of all cases and is characterized by frequent
spontaneous bleeds. Currently, Hemophilia A is treated with FVIII replacement via intravenous administration.

The main complication of FVIII replacement therapy is that 20% to 30% of patients with severe disease develop neutralizing alloantibodies against the FVIII protein.
These alloantibodies decrease the levels of FVIII and at high titers, render attempts to replace or stimulate the production of FVIII ineffective. The risk of alloantibody development
for  patients  with  severe  Hemophilia A  is  highest  during  their  initial  FVIII  exposures.  The  standard  treatment  to  reverse  alloantibody  formation  consists  of  repeated  high-dose
infusions of FVIII, which has limited efficacy, a high cost and is difficult to titrate to an appropriate therapeutic level for the patient. We believe FVIII-

28

 
CAART could be effective in addressing patients with Hemophilia A who have developed FVIII antibodies that require repeated, high-dose administrations of FVIII.

Epitope Mapping

The following image depicts FVIII, which is a large glycoprotein consisting of six domains that interact with each other to form the full complex.

Studies  conducted  in  patients  with  Hemophilia A  have  revealed  that  acquired  FVIII  alloantibodies  following  exogenous  FVIII  administration  are  typically  directed

against A2, C1 and C2 domains of FVIII.

CAAR Construct and Design

Preliminary  FVIII  CAAR  and  CAAR-like  constructs  have  been  engineered  that  target  parts,  but  not  all,  of  the  FVIII  domains.  Dr.  Milone,  one  of  our  scientific  co-

founders, has led the development of one such construct.

Development Plan

Internally,  we  are  conducting  additional studies  to  optimize  our  FVIII-CAART  development.  The  focus  of  these  studies  will  be  to  fully  characterize  any  additional
pathogenic epitopes and construct a FVIII-CAART that includes additional FVIII domains. Given the size of the FVIII protein, this will likely require us to incorporate additional
technologies to reduce the size of the final CAAR construct. An evaluation of potential technologies to achieve this objective is ongoing.

Manufacturing

Manufacturing Strategy

We intend to implement a three-stage plan that we believe will ultimately enable us to achieve manufacturing independence. Part of our strategy relies on engaging non-
profit and commercial suppliers early and in a staged manner. We believe partnering with proven and reputable manufacturing partners will allow us to efficiently deploy financial
and personnel resources. Stage 1 of this plan is in place and utilizes the deep expertise in cell and vector manufacturing from our partners at Children’s Hospital of Philadelphia, or
CHOP, and Penn. This included early development work, support of the DSG3-CAART IND, and cell and vector product manufacturing for our DesCAARTesTM trial. We believe
these facilities will allow us to move efficiently into clinical trials but are not sufficient to support a commercial license.

29

 
 
 
Stage 2 of our plan is designed to engage partners who are qualified for manufacturing of vector at commercial grade and scale and cell therapy products. We are aware
that changes in any manufacturing process or facility introduces regulatory and scientific risk to a development program, if the changes result in a product that is not comparable.
We plan to mitigate these risks primarily in two ways:

1.

2.

By  securing  contract  manufacturing  organizations,  or  CMOs,  as  partners  during  Stage  2  of  our  manufacturing  strategy  early  on  for  both  vector  and  cell
manufacturing. We plan to prioritize potential partners who are qualified to, and have an established track record of, the commercial production of vector and
cell  products.  We  believe  this  allows  us  to  make  one  change  in  our  supply  partners  during  an  early  period  of  clinical  development  to  facilitate in  vitro
comparability testing and clinical validation, prior to controlled clinical studies.

By  licensing  the  cell  manufacturing  process  used  for  our  planned  Phase  1  DSG3-CAART  first-in-human  study  from  Penn.  This  is  allowing  us  the  time  to
understand the process used in order to reduce the chance of changes that may impact comparability.

In addition to Stage 2, and contingent on sufficient clinical evidence from our planned DesCAARTesTM trial, we are further planning to pursue Stage 3 in manufacturing
supply. During Stage 3, we plan to build, qualify and run our own manufacturing facility. We believe this additional stage will enable full control of continuous improvement,
product development and commercial supply for products arising from our CABA platform. Our Chief Executive Officer and Executive Vice President, Science and Technology
have both, in prior roles, built and led organizations that have constructed and commissioned cell therapy facilities.

Vector Manufacturing

The  lentiviral  vector  that  we  plan  to  use  in  the  initial  subjects  in  our  DesCAARTesTM  trial  was  manufactured  at  CHOP.  We  have  also  reserved  multiple  vector
manufacturing slots at Penn and CHOP, which we may use in our DSG3-CAART or subsequent clinical trials. In parallel, we are engaging in development work with multiple
CMOs  with  a  plan  to  secure  production  slots  for  vector  which  may  be  used  in  our  DSG3-CAART  or  subsequent  clinical  trials.  We  believe  these  efforts  will  provide  us  with
sufficient clinical-grade vector to move forward with our anticipated clinical trials.

Cell Manufacturing

We have entered into a collaboration with the Clinical Cell and Vaccine Production Facility, or CVPF, at Penn, to provide focused scientific, technical and regulatory
support  for  CAAR  T  cell  manufacture.  CVPF  is  accredited  by  the  Foundation  for  the  Accreditation  of  Cellular  Therapy  and  is  capable  of  and  experienced  at  supporting
manufacture for early-phase clinical trials of novel cell therapy products in first-in-man clinical trials. We expect to rely upon CVPF to provide initial Phase 1 clinical trial drug
supply  for  DSG3-CAART.  Penn’s  manufacturing  process  for  DSG3-CAART  is  directly  related  to  the  process  developed  at  Penn  for  early  clinical  trials  of  CART19,  which
subsequently became known commercially as Kymriah. The process was later transferred to Novartis Pharmaceuticals Corporation and further modified for the Kymriah program.

As we scale our manufacturing of DSG3-CAART and our other product candidates to meet our expected needs for further clinical trials, we may or may not rely on Penn,
but we also expect to rely on CMOs and other third parties for the manufacturing and processing of our clinical trial materials. Any CMO that we select will be subject to cGMP
requirements. We believe the use of contract manufacturing for our pipeline programs will be cost-effective and allow us to rapidly prepare for clinical trials in accordance with our
development  plans.  In  preparation  for  this  transition,  we  have  engaged  multiple  third-party  contractors  to  manufacture  clinical  grade  viral  vector  used  to  deliver  the  applicable
CAAR gene into the T cells. We have also initiated development work with certain contractors for cGMP and commercial vector production. We expect third-party manufacturers
will be capable of providing and processing sufficient quantities of our product candidates to meet anticipated clinical trial demands and commercial need. In January 2021, we
initiated a collaboration with WuXi to serve as our cell processing manufacturing partner for the anticipated MuSK-CAART Phase 1 clinical trial.

30

 
 
 
Once we have sufficient clinical data from subjects in our DSG3-CAART study, we intend to begin the process of engineering and then establishing our own commercial
scale  GMP-compliant  manufacturing  facility.  We  believe  this  will  allow  us  to  enhance  supply  chain  control,  increase  supply  capacity  and  help  ensure  clinical  and  commercial
demand for our pipeline programs is met in the event that DSG3-CAART receives marketing approval. Informed by our experience in building cell therapy facilities and creating
supply chains, we plan to develop a robust supply chain with alternative sources to maintain continuous supply. In parallel with these activities, we are evaluating and executing
proof-of-concept  studies  to  test  advanced  manufacturing  and  automation  technologies  to  continuously  improve  the  manufacturing  process  and  meet  commercial  and  scalability
targets.

Commercialization

Our aim is to become a fully integrated cellular therapy company in order to improve the lives of patients with B cell-mediated autoimmune diseases. We have designed a
strategic approach to move forward with our lead product candidate, DSG3-CAART, while at the same time having a number of product candidates in development. The product
candidates from our CABA platform address clinical indications where there is a compelling opportunity to improve clinical outcomes in comparison with the current standard of
care  in  an  easily  identified  patient  population.  Our  initial  product  candidates  are  focused  on  rare  disease  populations  where  we  believe  there  is  potential  to  commercialize
independently. This is due to a concentration of treatment paradigms and limited but easily identified patient populations. Our plan is to focus commercialization and launch efforts
initially in the United States, and eventually in the European Union and Asia-Pacific geographies.

Competition

The biotechnology and pharmaceutical industries are characterized by rapidly advancing technologies, intense competition and a strong focus on intellectual property. We
face  competition  from  many  different  players,  including  large  and  specialty  pharmaceutical  and  biotechnology  companies,  academic  research  organizations  and  governmental
agencies. Any  therapeutic  candidates  we  successfully  develop  and  commercialize  will  compete  with  the  existing  standard  of  care  as  well  as  any  novel  therapies  that  may  gain
regulatory approval in the future.

Existing treatment options for PV are limited. Rituximab, marketed by Roche Holding AG, is the first drug to have received approval for PV in the United States in over
60  years.  In  Europe,  the  approved  therapies  for  PV  are  corticosteroids,  azathioprine  and  rituximab.  Other  standard  of  care  treatments  include  various  immunosuppressants,
plasmapheresis, and intravenous immunoglobulin infusions given monthly or on another periodic chronic basis. Additionally, multiple biopharmaceutical companies have therapies
in clinical development.

Competition in the MuSK MG autoimmune space is currently dominated by the current standard of care, rituximab. A second approved approach to treating patients is
IVIG,  which  is  available  through  CSL  Behring  LLC,  Grifols,  S.A.,  and  Mitsubishi  Tanabe  Pharma  Corporation.  Additionally,  multiple  biopharmaceutical  companies  have
therapies in clinical development.

Multiple therapies are approved or in development for the treatment of Hemophilia A patients who develop alloantibodies against FVIII. Standard of care is typically
immune tolerance induction, or ITI, therapy with higher doses of FVIII. Available treatments for those who do not respond to ITI include anti-inhibitor coagulation complexes,
recombinant factor VIIa, and bispecific factor IXa- and factor X-directed antibodies. Companies who market products or are developing product candidates within these categories
of medicine include Catalyst Pharmaceuticals, Inc., Novo Nordisk A/S, OPKO Health, Inc., Roche Holding AG and Takeda Pharmaceutical Company.

31

 
We  believe  we  are  the  first  and  only  company  developing  CAAR  T  drug  candidates  for  the  treatment  of  B  cell-mediated  autoimmune  diseases.  However,  despite  the
significant differences in discovery, development and target populations between oncology and autoimmune targets, we recognize that companies with an investment and expertise
in  CAR  T  cell  development  for  oncology  indications  could  attempt  to  leverage  their  expertise  into  B  cell-mediated  autoimmune  disease-affected  populations.  We  are  aware  of
biotechnology  companies  that  are  exploring  other  methods  of  engineering  T  cells  for  the  treatment  of  autoimmune  conditions.  In  addition,  some  biotechnology  companies  are
engineering red blood cells to incorporate self-antigens with the goal of tolerizing the immune system to treat autoimmune and alloimmune conditions.

Many of the companies against which we are competing or against which we may compete in the future 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 industry may result in even more resources being concentrated among a smaller number of our competitors. Smaller or early
stage  companies  may  also  prove  to  be  significant  competitors,  particularly  through  collaborative  arrangements  with  large  and  established  companies.  These  competitors  also
compete with us in recruiting and retaining qualified scientific and management personnel and establishing clinical trial sites and patient registration for clinical trials, as well as in
acquiring technologies complementary to, or necessary for, our programs.

Intellectual Property and Barriers to Entry

We strive to protect the proprietary technologies that we believe are important to our business, including pursuing and maintaining patent protection intended to cover our
product  candidates  and  their  use,  as  well  as  other  inventions  that  are  important  to  our  business.  In  addition  to  patent  protection,  we  also  rely  on  know-how,  confidentiality
agreements,  invention  assignment  agreements  and  trade  secrets  to  protect  aspects  of  our  business  that  are  not  amenable  to,  or  that  we  do  not  consider  appropriate  for,  patent
protection,  to  develop  and  maintain  our  proprietary  position.  The  confidentiality  agreements  are  designed  to  protect  our  proprietary  information  and  the  invention  assignment
agreements  are  designed  to  grant  us  ownership  of  technologies  that  are  developed  for  us  by  our  employees,  consultants  or  certain  other  third  parties.  We  seek  to  preserve  the
integrity  and  confidentiality  of  our  data  and  trade  secrets  by  maintaining  physical  security  of  our  premises  and  physical  and  electronic  security  of  our  information  technology
systems. While we have confidence in our agreements and security measures, either may be breached, and we may not have adequate remedies. In addition, our trade secrets may
otherwise become known or independently discovered by competitors.

Our  commercial  success  depends  in  part  upon  our  ability  to  obtain  and  maintain  patent  and  other  proprietary  protection  for  commercially  important  technologies,
inventions  and  trade  secrets  related  to  our  business,  defend  and  enforce  our  intellectual  property  rights,  particularly  our  patent  rights,  preserve  the  confidentiality  of  our  trade
secrets and operate without infringing valid and enforceable intellectual property rights of others.

The patent positions for biotechnology companies like us are generally uncertain and can involve complex legal, scientific and factual issues. In addition, the coverage
claimed in a patent application can be significantly reduced before a patent is issued, and its scope can be reinterpreted and even challenged after issuance. As a result, we cannot
guarantee that any of our product candidates will be protectable or remain protected by enforceable patents. We cannot predict whether the patent applications we are currently
pursuing will issue as patents in any particular jurisdiction or whether the claims of any issued patents will provide sufficient proprietary protection from competitors. Any patents
that we hold may be challenged, circumvented or invalidated by third parties.

As of February 1, 2021, our patent estate (all of which has been in-licensed) included one issued U.S. patent, seven pending U.S. patent applications, and 34 pending
foreign patent applications. See “—Our Material Agreements—Amended and Restated License Agreement with the Trustees of the University of Pennsylvania and the Children’s
Hospital of Philadelphia.”

With regard to our DSG3-CAART and DSG3/1-CAART product candidates, we have one issued U.S. patent with claims directed to a genetically modified cell containing
a chimeric autoantibody receptor containing an extracellular domain containing DSG3, DSG1 or fragments thereof, which is scheduled to expire in 2035, without taking a potential
patent term extension into account. We also have four pending U.S. patent applications and

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counterpart patent applications pending in Canada, China and Europe, which if issued, would be expected to expire in 2035. This patent family is owned by Penn and exclusively
licensed to us in the field of the license.

With regard to our MuSK-CAAR T cell product candidate, we have one pending U.S. patent application and counterpart patent applications pending in Australia, Canada,
China, Europe, Israel, Japan, Korea, Mexico, New Zealand, and Russia, which if issued, would be expected to expire in 2039. This patent family is owned by Penn and exclusively
licensed to us in the field of the license.

With regard to our FVIII-CAAR T cell product candidate, we have one pending U.S. patent application and counterpart patent applications pending in Australia, Canada,
China, Europe, Japan, Hong Kong, Korea, Mexico, New Zealand, and Russia, which if issued, would be expected to expire in 2037. This patent family is co-owned by Penn and
CHOP and is exclusively licensed to us in the field of the license.

The term of individual patents depends upon the legal term of the patents in the countries in which they are obtained. In most countries in which we file, the patent term is

20 years from the earliest date of filing a non-provisional patent application.

In the United States, the term of a patent covering an FDA-approved drug may be eligible for a patent term extension under the Hatch-Waxman Act as compensation for
the  loss  of  patent  term  during  the  FDA  regulatory  review  process.  The  period  of  extension  may  be  up  to  five  years  beyond  the  expiration  of  the  patent,  but  cannot  extend  the
remaining term of a patent beyond a total of 14 years from the date of product approval. Only one patent among those eligible for an extension may be extended, and a given patent
may only be extended once. Similar provisions are available in Europe and in certain other jurisdictions to extend the term of a patent that covers an approved drug. It is possible
that issued U.S. patents covering each of our product candidates may be entitled to patent term extensions. If our product candidates receive FDA approval, we intend to apply for
patent term extensions, if available, to extend the term of patents that cover the approved product candidates. We also intend to seek patent term extensions in any jurisdictions
where they are available, however, there is no guarantee that the applicable authorities, including the FDA, will agree with our assessment of whether such extensions should be
granted, and even if granted, the length of such extensions.

In addition to patent protection, we also rely on know-how and trade secret protection for our proprietary information that is not amenable to, or that we do not consider
appropriate  for,  patent  protection,  to  develop  and  maintain  our  proprietary  position.  However,  trade  secrets  can  be  difficult  to  protect. Although  we  take  steps  to  protect  our
proprietary information, including restricting access to our premises and our confidential information, as well as entering into agreements with our employees, consultants, advisors
and potential collaborators, third parties may independently develop the same or similar proprietary information or may otherwise gain access to our proprietary information. As a
result, we may be unable to meaningfully protect our know-how, trade secrets, and other proprietary information.

In addition, we plan to rely on regulatory protection based on orphan drug exclusivities, data exclusivities, and market exclusivities. See “—Government Regulation” for

additional information.

Our Material Agreements

 Amended and Restated License Agreement with the Trustees of the University of Pennsylvania and the Children’s Hospital of Philadelphia

In July 2019, we entered into an amended and restated license agreement, or the License Agreement, as further amended in May 2020, with Penn and CHOP, collectively
the Institutions, pursuant to which we obtained (a) a non-exclusive, non-sublicensable, worldwide research license to make, have made and use products in two subfields of use,
(b) effective as of October 2018, an exclusive, worldwide, royalty-bearing license, with the right to sublicense, under certain patent rights of the Institution to make, use, sell, offer
for sale and import products in the same two subfields of use, and (c) effective as of October 2018, a non-exclusive, worldwide, royalty-bearing license, with limited rights to
sublicense, under certain of Penn’s know-how, which know-how satisfies certain criteria and is listed on a mutually agreed-to schedule, to make, have made, use, sell, offer for
sale, import and have imported products in the same two subfields of use. Our rights are subject to the rights of the U.S. government and certain

33

 
rights retained by the Institutions. The License Agreement was amended in May 2020 to add certain intellectual property relating to one of the three undisclosed disease targets.

Unless earlier terminated, the License Agreement expires on the expiration or abandonment or other termination of the last valid claim in the intellectual property we
license from Penn. We may terminate the License Agreement at any time for convenience upon 60 days written notice. In the event of an uncured, material breach, Penn may
terminate the License Agreement upon 60 days written notice.

Penn  maintains  control  of  all  filing,  prosecution  and  maintenance  of  the  Institutions’  patent  rights  licensed  by  us,  and  we  are  responsible  for  all  ongoing  patent  costs
during  the  term  of  the  agreement.  We  also  reimbursed  Penn  for  its  out-of-pocket  expenses  incurred  prior  to  the  effective  date  of  the  agreement  with  respect  to  the  filing,
prosecution and maintenance of the patent rights licensed by us. Under the terms of the License Agreement, we were also obligated to pay $2.0 million annually for three years
beginning  August  2018  for  funding  to  the  laboratories  of  each  of  Drs.  Milone  and  Payne.  See  “—Sponsored  Research  Agreements  with  the  Trustees  of  the  University  of
Pennsylvania.”

Under the License Agreement, we must use commercially reasonable efforts to develop and commercialize a product in each subfield. During the term of the License
Agreement until the first commercial sale of the first product, we are obligated to pay Penn a non-refundable, non-creditable annual license maintenance fee of $10,000. We are
required to pay certain milestone payments upon the achievement of specified clinical and commercial milestones. Milestone payments are reduced by a certain percentage for the
second  product  that  achieves  a  milestone,  by  an  additional  percentage  for  the  third  product  that  achieves  a  milestone,  and  so  on,  for  each  subsequent  product  that  achieves  a
milestone.  In  the  event  that  we  are  able  to  successfully  develop  and  launch  multiple  products  under  the  License Agreement,  total  milestone  payments  could  be  approximately
$21.0 million. Penn is also eligible to receive tiered royalties at percentage rates in the low single-digits, subject to an annual minimum royalty, on annual worldwide net sales of
any products that are commercialized by us, our affiliates or our sublicensees that contain, use, embody, result from the use of or incorporate, or are covered by, the intellectual
property licensed by us. To the extent we sublicense our license rights under the License Agreement, Penn would be eligible to receive tiered sublicense income at percentage rates
in  the  mid-single  to  low  double-digits.  We  have  also  entered  into  a  subscription  and  technology  transfer  agreement  with  Penn,  pursuant  to  which  we  owed  Penn  an  upfront
subscription fee, which was paid in 2019, and a nominal non-refundable royalty on the net sales of products, a portion of which will be credited toward milestone payments and
royalties under this License Agreement. Technology transfer activities would be at our cost and subject to agreement as to the technology to be transferred.

Sponsored Research Agreements with Penn

Dr. Michael Milone

In April 2018, we entered into a Sponsored Research Agreement with Penn for the laboratory of Dr. Milone, or the Milone SRA, pursuant to which we agreed to sponsor
certain  research  related  to  the  development  of  (i)  T  cell  based  immunotherapies  for  autoimmune  and  alloimmune  antibodies  of  pathologic  significance  and  (ii)  a  clinical  grade
microfluidic device designed for single step selection and activation of T cells from blood samples to be conducted in Dr. Milone’s laboratory at Penn. Under the Milone SRA,
Penn granted us a perpetual, irrevocable, non-transferable, non-exclusive license to use all intellectual property resulting from the research sponsored by us for internal research
purposes. In addition, Penn granted us an option to include, in exchange for a fee, any intellectual property resulting from the research sponsored by us that relates to CAAR T cell
therapies  for  hemophilia  and/or  pemphigus  within  the  scope  of  the  License Agreement.  Penn  also  granted  us  an  option  to  negotiate  a  license  to  all  other  intellectual  property
resulting from the research sponsored by us. Unless earlier terminated, the Milone SRA will expire on April 23, 2021.

Dr. Aimee Payne

In April 2018, we entered into a Sponsored Research Agreement with Penn for the laboratory of Dr. Payne, or the Payne SRA, pursuant to which we agreed to sponsor
certain research related to the development of T cell based immunotherapies for autoimmune and alloimmune antibodies of pathologic significance to be conducted in Dr. Payne’s
laboratory at Penn. In May 2020, the  Payne  SRA  was  amended  to   include  CAAR  design  and  optimization  efforts  in  three  additional  B  cell-mediated  autoimmune  diseases.  In
August  2020,  this  agreement  was  further  amended  to  extend  the  term  of  the  original  research  plan. Under  the  Payne  SRA,  Penn  granted  us  a  perpetual,  irrevocable,  non-
transferable, non-exclusive license to use all intellectual property resulting from the research sponsored by us for internal research purposes. In addition, Penn granted us an option
to include, in exchange for a fee, any intellectual property resulting from the research sponsored by us that relates to CAAR T cell therapies for

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hemophilia, MG and/or pemphigus within the scope of the License Agreement. Penn also granted us an option to negotiate a license to all other intellectual property resulting from
the research sponsored by us. Unless earlier terminated, the Payne SRA will expire in February 2023.

We have committed to funding a defined research plan for through February 2023 under both the Milone and Payne SRAs. We have estimated the total cost of the two
SRAs  to  be  $11.8  million,  which  satisfies  the  $2.0  million  annual  obligation  under  the  License Agreement. As  of  December  31,  2020,  $7.1  million  of  cost  has  been  incurred
pursuant to the Milone and Payne SRAs.

Master Translational Research Services Agreement with Penn

  In October 2018, we entered into a Master Translational Research Services Agreement with Penn, or the Services Agreement, pursuant to which Penn agreed to perform
certain services related to the research and development of the technology licensed to us under the License Agreement, as well as certain clinical, regulatory and manufacturing
services. The Services Agreement will expire on the later of (i) October 19, 2021 or (ii) completion of the services for which we have engaged Penn under the Services Agreement.
Either party may terminate this agreement with or without cause upon a certain number of days’ prior written notice. The services encompassed by the Services Agreement are
performed  by  different  organizations  at  Penn  pursuant  to  certain  addenda  to  the  Services Agreement,  including  the  Center  for Advanced  Retinal  and  Ocular  Therapeutics,  or
CAROT, Addendum, as amended in May 2020, and the CVPF Addendum. In addition, in July 2019 we entered into an Alliance Agreement with Penn, pursuant to which we will
pay Penn a nominal annual fee in order for Penn to provide an adequate and consistent level of support to the services that it provides to us.

The CAROT Addendum

Under the CAROT Addendum, Penn manufactures vector that is then to be used by the CVPF in the manufacture of our product candidates. In the event that certain
materials owned by Penn are incorporated into a product developed for us, Penn has agreed to grant us a limited license to use those materials. Further, Penn agreed to grant us an
exclusive, paid-up, royalty-free, transferable, irrevocable, perpetual exclusive license to any deliverables produced under the CAROT Addendum, except with respect to certain
technical  information  of  Penn  that  is  contained  or  incorporated  in  the  deliverables,  to  which  Penn  agreed  to  grant  us  a  limited  nonexclusive  license.  However,  any  necessary
technology transfer would be pursuant to the subscription and technology transfer agreement described above.

The CVPF Addendum

Under the CVPF Addendum, Penn conducts process validation studies and large-scale engineering runs for our product candidates. Under the CVPF Addendum, CVPF
will contractually agree to manufacture agreed upon quantities of DSG3-CAART material for use in connection with our DesCAARTes TM trial, unless the agreement is terminated
by either party. Any necessary technology transfer would be pursuant to the subscription and technology transfer agreement described above.

Research Agreements with The Regents of the University of California

In  October  2018,  we  entered  into  the  first  Research Agreement,  or  the  First  UC Agreement,  with  The  Regents  of  the  University  of  California,  or  the  UC  Regents,
pursuant to which the UC Regents agreed to perform certain research projects relating to the toxicity and activity of MuSK CAAR T cells in various models of anti-MuSK MG, or
the UC Research. In January 2021, we entered into the Second Research Agreement, or the Second UC Agreement, collectively, the UC Agreements, pursuant to which the UC
Regents agreed to perform the same.

The  UC Agreements  provide  that  the  UC  Regents  will  own  all  rights  to  any  intellectual  property  developed  solely  by  UC  Regents  employees  in  conducting  the  UC
Research, or developed solely by any of our employees that conduct the UC Research using the UC Regents’ facilities or resources. The UC Regents granted us an irrevocable,
royalty-free, nonexclusive, worldwide, nontransferable, perpetual license to use this UC-owned intellectual property for internal research purposes only.

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We  and  the  UC  Regents  jointly  own  the  rights  to  any  intellectual  property  jointly  developed  by  our  employees  and  UC  Regents  employees  in  conducting  the  UC
Research, provided that our employees did not use the UC Regents’ facilities or resources in the research. We were granted an option to acquire a non-exclusive or exclusive,
worldwide, transferable license, including the right to sublicense, to make, use sell, offer for sale, import and otherwise exploit products embodying these joint inventions.

If  we  exercise  our  option  with  respect  to  certain  intellectual  property  under  the  UC Agreements,  any  license  we  enter  into  will  require  us  to  diligently  pursue  timely
commercial development and marketing of product candidates using such intellectual property, and will be subject to other terms and conditions to be negotiated at the time of
entering into any such license. Unless earlier terminated, the term of the First UC Agreement will expire in January 2022. Unless earlier terminated, the term of the Second UC
Agreement will expire in 2023.

Government Regulation

U.S. Regulation

As a biopharmaceutical company that operates in the United States, we are subject to extensive regulation. Our cell products will be regulated as biologics. With this
classification, commercial production of our products will need to occur in registered facilities in compliance with cGMP for biologics. The FDA categorizes human cell- or tissue-
based products as either minimally manipulated or more than minimally manipulated, and has determined that more than minimally manipulated products require clinical trials to
demonstrate product safety and efficacy and the submission of a BLA for marketing authorization. Our products are considered more than minimally manipulated and will require
evaluation in clinical trials and the submission and approval of a BLA before we can market them.

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,  manufacturing,  quality  control,  approval,  labeling,  packaging,  storage,  record-keeping,  promotion,  advertising,  distribution,  post-approval  monitoring  and
reporting, marketing and export and import of biopharmaceutical products such as those we are developing. Our product candidates must be approved by the FDA before they may
be legally marketed in the United States and by the appropriate foreign regulatory agency before they may be legally marketed in foreign countries. Generally, our activities in
other countries will be subject to regulation that is similar in nature and scope as that imposed in the United States, although there can be important differences. Additionally, some
significant  aspects  of  regulation  in  Europe  are  addressed  in  a  centralized  way,  but  country-specific  regulation  remains  essential  in  many  respects.  The  process  for  obtaining
regulatory marketing approvals and the subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time
and financial resources.

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U.S. Biological Product Development

In the United States, the FDA regulates biologics under the Federal Food, Drug, and Cosmetic Act, or FDCA, and the Public Health Service Act, or PHSA, and their
implementing regulations. Biologics are also subject to other federal, state and local statutes and regulations. The process of obtaining regulatory approvals and the subsequent
compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources. Failure to comply with the
applicable U.S. requirements at any time during the product development process, approval process or after approval, may result in delays to the conduct of a study, regulatory
review  and  approval  or  subject  an  applicant  to  administrative  or  judicial  sanctions.  These  sanctions  could  include,  among  other  actions,  the  FDA’s  refusal  to  approve  pending
applications, withdrawal of an approval, license suspension or revocation, refusal to allow an applicant to proceed with clinical trials, imposition of a clinical hold, issuance of
untitled or warning letters, product recalls or withdrawals from the market, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals of
government contracts, restitution, disgorgement of profits, or civil or criminal investigations or penalties. Any agency or judicial enforcement action could have a material adverse
effect on us.

Our  drug  product  candidates  must  be  approved  by  the  FDA  through  the  Biologics  License Application,  or  BLA,  process  before  they  may  be  legally  marketed  in  the

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

•

•

•

•

•

•

•

•

completion of extensive nonclinical, sometimes referred to as preclinical, laboratory tests, animal studies and formulation studies in accordance with applicable
regulations, including the FDA’s Good Laboratory Practice, or GLP, regulations and standards;

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, representing each clinical site before each clinical trial may be initiated;

performance of adequate and well-controlled human clinical trials in accordance with applicable IND regulations, good clinical practices, or GCPs, and other
clinical trial-related regulations to establish the safety and efficacy of the proposed drug product candidate for its proposed indication;

submission to the FDA of a BLA, which includes not only the results of the clinical trials, but also, detailed information on the chemistry, manufacture and
quality controls for the product candidate and proposed labeling;

satisfactory completion of an FDA pre-approval inspection of the manufacturing facility or facilities where the product is produced to assess compliance with
the  FDA’s  current  good  manufacturing  practice,  or  cGMP,  requirements  to  assure  that  the  facilities,  methods  and  controls  are  adequate  to  preserve  the
product’s identity, strength, quality, purity and potency;

potential FDA audit of the preclinical trial sites and/or clinical trial sites that generated the data in support of the BLA; and

FDA review and approval of the BLA prior to any commercial marketing or sale of the product in the United States.

The  data  required  to  support  a  BLA  is  generated  in  two  distinct  development  stages:  preclinical  and  clinical.  The  preclinical  development  stage  generally  involves
laboratory evaluations of drug chemistry, formulation and stability, as well as studies to evaluate toxicity in animals, which support subsequent clinical testing. The conduct of the
preclinical studies must comply with federal regulations, including GLPs. The sponsor must submit the results of the preclinical studies, together with manufacturing information,
analytical  data,  any  available  clinical  data  or  literature  and  a  proposed  clinical  protocol,  as  well  as  other  information,  to  the  FDA  as  part  of  the  IND. An  IND  is  a  request  for
authorization  from  the  FDA  to  administer  an  investigational  drug  product  to  humans.  The  central  focus  of  an  IND  submission  is  on  the  general  investigational  plan  and  the
protocol(s)  for  human  trials.  The  IND  automatically  becomes  effective  30  days  after  receipt  by  the  FDA,  unless  the  FDA  raises  concerns  or  questions  regarding  the  proposed
clinical trials and places the IND on clinical hold within that 30-day time period. In such a case, the IND sponsor and the FDA must resolve any outstanding concerns before the
clinical trial can begin. The FDA may also impose clinical holds on a drug product candidate at any time before or during clinical trials due to safety concerns, non-compliance, or
other issues affecting the integrity of the trial. Accordingly, we cannot be sure that submission of an IND will result in the FDA allowing clinical trials to begin, or that, once begun,
issues will not arise that could cause the trial to be suspended or terminated.

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In addition to the submission of an IND to the FDA before initiation of a clinical trial in the United States, certain human clinical trials involving recombinant or synthetic
nucleic acid molecules had historically been subject to review by the Recombinant DNA Advisory Committee, or RAC, of the NIH Office of Biotechnology Activities, or the NIH
Office of Biotechnology Activities, or OBA, pursuant to the NIH Guidelines. On August 17, 2018, the NIH issued a notice in the Federal Register and issued a public statement
proposing changes to the oversight framework for gene therapy trials, including changes to the applicable NIH Guidelines to modify the roles and responsibilities of the RAC with
respect  to  human  clinical  trials  of  gene  therapy  products,  and  requesting  public  comment  on  its  proposed  modifications.  During  the  public  comment  period,  which  closed
October 16, 2018, the NIH announced that it will no longer accept new human gene transfer protocols for review as a part of the protocol registration process or convene the RAC
to review individual clinical protocols. In April 2019, NIH announced the updated guidelines, which reflect these proposed changes, and clarify that these trials will remain subject
to the FDA’s oversight and other clinical trial regulations, and oversight at the local level will continue as set forth in the NIH Guidelines. Specifically, under the NIH Guidelines,
supervision  of  human  gene  transfer  trials  includes  evaluation  and  assessment  by  an  Institutional  Biosafety  Committee,  or  IBC,  a  local  institutional  committee  that  reviews  and
oversees research utilizing recombinant or synthetic nucleic acid molecules at that institution. The IBC assesses the safety of the research and identifies any potential risk to public
health or the environment, and such review may result in some delay before initiation of a clinical trial. While the NIH Guidelines are not mandatory unless the research in question
is being conducted at or sponsored by institutions receiving NIH funding of recombinant or synthetic nucleic acid molecule research, many companies and other institutions not
otherwise subject to the NIH Guidelines voluntarily follow them.

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The  clinical  stage  of  development  involves  the  administration  of  the  drug  product  candidate  to  healthy  volunteers  and  patients  under  the  supervision  of  qualified
investigators, generally physicians not employed by or under the trial sponsor’s control, in accordance with GCPs, which include the requirement that all research subjects provide
their informed consent for their participation in any clinical trial. Clinical trials are conducted under protocols detailing, among other things, the objectives of the clinical trial,
dosing  procedures,  subject  selection  and  exclusion  criteria,  and  the  parameters  to  be  used  to  monitor  subject  safety  and  assess  efficacy.  Each  protocol,  and  any  subsequent
amendments to the protocol, must be submitted to the FDA as part of the IND. Further, each clinical trial must be reviewed and approved by an IRB at or servicing each institution
at  which  the  clinical  trial  will  be  conducted. An  IRB  is  charged  with  protecting  the  welfare  and  rights  of  trial  participants  and  considers  such  items  as  whether  the  risks  to
individuals participating in the clinical trials are minimized and are reasonable in relation to anticipated benefits. The IRB also approves the informed consent form that must be
provided to each clinical trial subject or his or her legal representative and must monitor the clinical trial until completed.

There are also requirements governing the reporting of ongoing clinical trials and completed clinical trial results to public registries. Sponsors of certain clinical trials of

FDA-regulated products, including biologics, are required to register and disclose certain clinical trial information, which is publicly available at www.clinicaltrials.gov.

Clinical trials are generally conducted in three sequential phases, known as Phase 1, Phase 2 and Phase 3, and may overlap. Phase 1 clinical trials generally involve a
small number of healthy volunteers who are initially exposed to a single dose and then multiple doses of the drug product candidate. The primary purpose of these clinical trials is
to assess the metabolism, pharmacologic action tolerability, adverse effects, and safety of the drug product candidate and, if possible, to gain early evidence on effectiveness. Phase
2  clinical  trials  typically  involve  studies  in  disease-affected  patients  to  determine  the  dose  required  to  produce  the  desired  benefits.  At  the  same  time,  safety  and  further
pharmacokinetic and pharmacodynamic information is collected, as well as identification of possible adverse effects and safety risks and preliminary evaluation of efficacy. Phase
3 clinical trials generally involve large numbers of patients at multiple sites, in multiple countries, and are designed to provide the data necessary to demonstrate the efficacy of the
product for its intended use, its safety in use, and to establish the overall benefit/risk relationship of the product and provide an adequate basis for product approval. Phase 3 clinical
trials may include comparisons with placebo and/or other comparator treatments. The duration of treatment is often extended to mimic the actual use of a product during marketing.
Generally, two adequate and well-controlled Phase 3 clinical trials are required by the FDA for approval of a BLA. In certain instances, FDA may condition approval of a BLA on
the sponsor’s agreement to conduct additional clinical trials to further assess the biologic’s safety and effectiveness after BLA approval. Such post-approval trials are sometimes
referred to as Phase 4 clinical trials. These trials are used to gain additional experience from the treatment of patients in the intended therapeutic indication and further document
clinical benefit in the case of drugs approved under Accelerated Approval regulations. Failure to exhibit due diligence with regard to conducting Phase 4 clinical trials could result
in withdrawal of approval for products.

Progress reports detailing the results of the clinical trials, among other information, must be submitted at least annually to the FDA, and written IND safety reports must
be submitted to the FDA and the investigators for serious and unexpected suspected adverse events, findings from other studies suggesting a significant risk to humans exposed to
the  biologic,  findings  from  animal  or  in  vitro  testing  that  suggest  a  significant  risk  for  human  subjects,  and  any  clinically  important  increase  in  the  rate  of  a  serious  suspected
adverse  reaction  over  that  listed  in  the  protocol  or  investigator  brochure.  Phase  1,  Phase  2  and  Phase  3  clinical  trials  may  not  be  completed  successfully  within  any  specified
period, if at all. The FDA, the IRB, or the sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects or patients
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.  Additionally,  some  clinical  trials  are  overseen  by  an
independent group of qualified experts organized by the clinical trial sponsor, known as a data safety monitoring board or committee. This group provides authorization for whether
or not a trial may move forward at designated intervals based on access to certain data from the trial and may halt the clinical trial if it determines that there is an unacceptable
safety risk for subjects or other grounds, such as interim data suggesting a lack of efficacy. We may also suspend or terminate a clinical trial based on evolving business objectives
and/or competitive climate. Concurrent with clinical trials, companies usually complete additional animal studies and must also develop additional information about the chemistry
and  physical  characteristics  of  the  drug  product  candidate  as  well  as  finalize  a  process  for  manufacturing  the  product  in  commercial  quantities  in  accordance  with  cGMP
requirements. The manufacturing process must be capable of consistently producing quality batches of the drug product candidate and, among other things, must develop methods
for testing the identity, strength, quality, potency and purity of the final product. Additionally,

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appropriate  packaging  must  be  selected  and  tested  and  stability  studies  must  be  conducted  to  demonstrate  that  the  drug  product  candidate  does  not  undergo  unacceptable
deterioration over its shelf life.

BLA and FDA Review Process

Following trial completion, trial data are analyzed to assess safety and efficacy. The results of preclinical studies and clinical trials are then submitted to the FDA as part of
a BLA, along with proposed labeling for the product and information about the manufacturing process and facilities that will be used to ensure product quality, results of analytical
testing  conducted  on  the  chemistry  of  the  drug  product  candidate,  and  other  relevant  information.  The  BLA  is  a  request  for  approval  to  market  the  biologic  for  one  or  more
specified  indications  and  must  contain  proof  of  safety,  purity,  potency  and  efficacy,  which  is  demonstrated  by  extensive  preclinical  and  clinical  testing.  The  application  may
include both negative or ambiguous results of preclinical and clinical trials as well as positive findings. Data may come from company-sponsored clinical trials intended to test the
safety and efficacy of a use of a product, or from a number of alternative sources, including studies initiated by investigators. To support marketing approval, the data submitted
must be sufficient in quality and quantity to establish the safety and efficacy of the investigational product to the satisfaction of the FDA. FDA approval of a BLA must be obtained
before a biologic may be marketed in the United States.

Under  the  Prescription  Drug  User  Fee Act,  or  PDUFA,  as  amended,  each  BLA  must  be  accompanied  by  a  significant  user  fee,  which  is  adjusted  on  an  annual  basis.
PDUFA also imposes an annual prescription drug product program fee. Fee waivers or reductions are available in certain circumstances, including a waiver of the application fee
for the first application filed by a small business.

Once a BLA has been accepted for filing, which occurs, if at all, sixty days after the BLA’s submission, the FDA’s goal is to review BLAs within 10 months of the filing
date for standard review or six months of the filing date for priority review, if the application is for a product intended for a serious or life-threatening condition and the product, if
approved, would provide a significant improvement in safety or effectiveness. The FDA has substantial discretion in the approval process and may refuse to accept any application
or decide that the data is insufficient for approval, and may require additional preclinical, clinical or other studies before it accepts the filing. Additionally, the review process is
often significantly extended by FDA requests for additional information or clarification.

After the BLA submission is accepted for filing, the FDA reviews the BLA to determine, among other things, whether the proposed drug product candidate is safe and
effective for its intended use, and whether the drug product candidate is being manufactured in accordance with cGMP to assure and preserve the drug product candidate’s identity,
strength, quality, purity and potency. The FDA may refer applications for novel drug product candidates or drug product candidates which 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 and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making
decisions. The FDA will likely re-analyze the clinical trial data, which could result in extensive discussions between the FDA and us during the review process. The review and
evaluation of a BLA by the FDA is extensive and time consuming and may take longer than originally planned to complete, and we may not receive a timely approval, if at all.

Before approving a BLA, the FDA will conduct a pre-approval inspection of the manufacturing facilities for the new product to determine whether the facilities comply
with cGMPs. The FDA will not approve the product 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  a  BLA,  the  FDA  may  also  audit  data  from  clinical  trials  to  ensure
compliance with GCP requirements. After the FDA evaluates the application, manufacturing process and manufacturing facilities, it may issue an approval letter or a Complete
Response Letter. An approval letter authorizes commercial marketing of the product with specific prescribing information for specific indications. A Complete Response Letter
indicates that the review cycle of the application is complete and the application will not be approved in its present form. A Complete Response Letter usually describes all of the
specific deficiencies in the BLA identified by the FDA. The Complete Response Letter may require additional clinical data and/or an additional pivotal Phase 3 clinical trial(s),
and/or other significant and time-consuming requirements related to clinical trials, preclinical studies or manufacturing. If a Complete Response Letter is issued, the applicant may
either resubmit the BLA, addressing all of the deficiencies identified in the letter, withdraw the application or request a hearing. Even if such data and information is submitted, the
FDA may

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ultimately decide that the BLA does not satisfy the criteria for approval. Data obtained from clinical trials are not always conclusive, and the FDA may interpret data differently
than we interpret the same data.

There is no assurance that the FDA will ultimately approve a product for marketing in the United States, and we may encounter significant difficulties or costs during the
review process. If a product receives marketing approval, the approval may be significantly limited to specific populations, severities of allergies, and dosages or the indications for
use may otherwise be limited, which could restrict the commercial value of the product. Further, the FDA may require that certain contraindications, warnings or precautions be
included in the product labeling or may condition the approval of the BLA on other changes to the proposed labeling, development of adequate controls and specifications, or a
commitment to conduct post-market testing or clinical trials and surveillance to monitor the effects of approved products. For example, the FDA may require Phase 4 testing which
involves  clinical  trials  designed  to  further  assess  the  product’s  safety  and  effectiveness  and  may  require  testing  and  surveillance  programs  to  monitor  the  safety  of  approved
products  that  have  been  commercialized.  The  FDA  may  also  place  other  conditions  on  approvals  including  the  requirement  for  a  Risk  Evaluation  and  Mitigation  Strategy,  or
REMS, to assure the safe use of the product. If the FDA concludes a REMS is needed, the sponsor of the BLA must submit a proposed REMS. The FDA will not approve the BLA
without an approved REMS, if required. A REMS could include medication guides, physician communication plans, or elements to assure safe use, such as restricted distribution
methods, patient registries and other risk minimization tools. Any of these limitations on approval or marketing could restrict the commercial promotion, distribution, prescription
or  dispensing  of  products.  Product  approvals  may  be  withdrawn  for  non-compliance  with  regulatory  standards  or  based  on  the  results  of  post-market  studies  or  surveillance
programs. Additionally, post-approval, many types of changes to the approved product, such as adding new indications, changing manufacturing processes and adding labeling
claims, are subject to further testing requirements and FDA review and approval. Such post-approval requirements can be costly and time-consuming and can affect the potential
market and profitability of the product.

Orphan Designation and Exclusivity

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biological product intended to treat a rare disease or condition, which is generally a
disease or condition that affects fewer than 200,000 individuals in the United States, or more than 200,000 individuals in the United States and for which there is no reasonable
expectation that the cost of developing and making the product available in the United States for this type of disease or condition will be recovered from sales of the product.

Orphan drug designation must be requested before submitting an NDA or BLA. After the FDA grants orphan drug designation, the identity of the therapeutic agent 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.

If a product that has orphan drug designation subsequently receives the first FDA approval for the disease or condition for which it has such designation, the product is
entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications to market the same drug or biologic for the same indication for seven years
from the date of such approval, except in limited circumstances, such as a showing of clinical superiority to the product with orphan exclusivity on the basis of greater effectiveness
or safety or providing a major contribution to patient care or in instances of drug supply issues. Competitors, however, may receive approval of either a different product for the
same indication or the same product for a different indication but that could be used off-label in the orphan indication. Orphan drug exclusivity also could block the approval of one
of our products for seven years if a competitor obtains approval before we do for the same product, as defined by the FDA, for the same indication we are seeking approval, or if
our product is determined to be contained within the scope of the competitor’s product for the same indication or disease. If we pursue marketing approval for an indication broader
than the orphan drug designation we have received, we may not be entitled to orphan drug exclusivity. Orphan drug status in the European Union has similar, but not identical,
requirements and benefits.

Expedited Development and Review Programs

The  FDA  has  a  fast  track  program  that  is  intended  to  expedite  or  facilitate  the  process  for  reviewing  new  drugs  and  biological  products  that  meet  certain  criteria.
Specifically, new drugs and biological products are eligible for fast track designation if they are intended to treat a serious or life-threatening condition and nonclinical or clinical
data

41

 
demonstrate the potential to address unmet medical needs for the condition. Fast track designation applies to the combination of the product and the specific indication for which it
is  being  studied.  The  sponsor  of  a  new  drug  or  biologic  may  request  the  FDA  to  designate  the  drug  or  biologic  as  a fast track  product  concurrently  with,  or  at  any  time  after,
submission  of  an  IND,  and  the  FDA  must  determine  if  the  product  qualifies  for  fast track  designation  within  60  days  of  receipt  of  the  sponsor’s  request. Under the  fast track
designation,  the  FDA  may  consider  for  review  sections  of  the  marketing  application  on  a  rolling  basis  before  the  complete  application  is  submitted,  if  the  sponsor  provides  a
schedule for the submission of the sections of the application, the FDA agrees to accept sections of the application and determines that the schedule is acceptable, and the sponsor
pays any required user fees upon submission of the first section of the application.

Any  product  submitted  to  the  FDA  for  marketing,  including  under  a  fast  track  program,  may  be  eligible  for  other  types  of  FDA  programs  intended  to  expedite
development and review, such as priority review and accelerated approval. Any product is eligible for priority review, or review within a six-month timeframe from the date a
complete BLA is accepted for filing, if it has the potential to provide a significant improvement in safety and effectiveness compared to available therapies. The FDA will attempt
to direct additional resources to the evaluation of an application for a new drug or biological product designated for priority review in an effort to facilitate the review.

Additionally, a product may be eligible for accelerated approval. An investigational drug may obtain accelerated approval if it treats a serious or life-threatening condition
and generally provides a meaningful advantage over available therapies and demonstrates an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit or on
a clinical endpoint that can be measured earlier than irreversible morbidity or mortality, or IMM, that is reasonably likely to predict an effect on IMM or other clinical benefit. As a
condition of approval, the FDA may require that a sponsor of a drug or biological product receiving accelerated approval perform adequate and well-controlled post-marketing
clinical trials. If the FDA concludes that a drug shown to be effective can be safely used only if distribution or use is restricted, it will require such post-marketing restrictions as it
deems necessary to assure safe use of the drug, such as:

•

•

distribution restricted to certain facilities or physicians with special training or experience; or

distribution conditioned on the performance of specified medical procedures.

The limitations imposed would be commensurate with the specific safety concerns presented by the product. In addition, the FDA currently requires as a condition for
accelerated  approval  pre-approval  of  promotional  materials,  which  could  adversely  impact  the  timing  of  the  commercial  launch  of  the  product.  Fast  track  designation,  priority
review and accelerated approval do not change the standards for approval but may expedite the development or approval process.

Breakthrough Designation

A product can be designated as a breakthrough therapy if it is intended to treat a serious or life-threatening condition and preliminary clinical evidence indicates that it
may  demonstrate  substantial  improvement  over  existing  therapies  on  one  or  more  clinically  significant  endpoints.  A  sponsor  may  request  that  a  drug  product  candidate  be
designated as a breakthrough therapy concurrently with, or at any time after, the submission of an IND, and the FDA must determine if the drug product candidate qualifies for
breakthrough therapy designation within 60 days of receipt of the sponsor’s request. If so designated, the FDA shall act to expedite the development and review of the product’s
marketing application, including by meeting with the sponsor throughout the product’s development, providing timely advice to the sponsor to ensure that the development program
to  gather  preclinical  and  clinical  data  is  as  efficient  as  practicable,  involving  senior  managers  and  experienced  review  staff  in  a  cross-disciplinary  review,  assigning  a  cross-
disciplinary project lead for the FDA review team to facilitate an efficient review of the development program and to serve as a scientific liaison between the review team and the
sponsor, and taking steps to ensure that the design of the clinical trials is as efficient as practicable.

Accelerated Approval for Regenerative Medicine Advanced Therapies

As part of the 21st Century Cures Act, Congress amended the FDCA to create an accelerated approval program for regenerative advanced therapies, which include cell

therapies, therapeutic tissue engineering products,

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human  cell  and  tissue  products,  and  combination  products  using  any  such  therapies  or  products.  Regenerative medicine advanced  therapies  do  not  include  those  human  cells,
tissues, and cellular and tissue-based products regulated solely under section 361 of the Public Health Service Act and 21 CFR Part 1271. The new program is intended to facilitate
efficient development and expedite review of regenerative medicine advanced therapies, which are intended to treat, modify, reverse, or cure a serious or life-threatening disease or
condition. A drug sponsor may request that FDA designate a drug as a regenerative  medicine advanced therapy concurrently with or at any time after submission of an IND. FDA
has 60 calendar days to determine whether the drug meets the criteria, including whether there is preliminary clinical evidence indicating that the drug has the potential to address
unmet medical needs for a serious or life-threatening disease or condition. A new drug application or BLA for a regenerative medicine advanced therapy may be eligible for priority
review or accelerated approval through (1) surrogate or intermediate endpoints reasonably likely to predict long-term clinical benefit or (2) reliance upon data obtained from a
meaningful number of sites. Benefits of such designation also include early interactions with FDA to discuss any potential surrogate or intermediate endpoint to be used to support
accelerated  approval. A  regenerative  medicine advanced therapy that is granted accelerated approval  and  is  subject  to  post approval  requirements  may  fulfill  such  requirements
through the submission of clinical evidence, clinical studies, patient registries, or other sources of real world evidence, such as electronic health records; the collection of larger
confirmatory data sets; or post approval monitoring of all patients treated with such therapy prior to its approval.

Pediatric Trials

Under the Pediatric Research Equity Act, or PREA, a BLA or supplement to a BLA must contain data to assess the safety and efficacy of the product for the claimed
indications in all relevant pediatric subpopulations and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. The FDCA
requires that a sponsor who is planning to submit a marketing application for a drug or biological product that includes a new active ingredient, new indication, new dosage form,
new dosing regimen or new route of administration submit an initial Pediatric Study Plan, or PSP, within sixty days of an end-of-Phase 2 meeting or as may be agreed between the
sponsor and FDA. The initial PSP must include an outline of the pediatric study or studies that the sponsor plans to conduct, including study objectives and design, age groups,
relevant endpoints and statistical approach, or a justification for not including such detailed information, and any request for a deferral of pediatric assessments or a full or partial
waiver of the requirement to provide data from pediatric studies along with supporting information. The FDA and the sponsor must reach agreement on the PSP. A sponsor can
submit amendments to an agreed-upon initial PSP at any time if changes to the pediatric plan need to be considered based on data collected from nonclinical studies, early phase
clinical trials, and/or other clinical development programs. The FDA may, on its own initiative or at the request of the applicant, grant deferrals for submission of data or full or
partial waivers.

Post-Marketing Requirements

Following  approval  of  a  new  product,  a  manufacturer  and  the  approved  product  are  subject  to  continuing  regulation  by  the  FDA,  including,  among  other  things,
monitoring  and  recordkeeping  activities,  reporting  to  the  applicable  regulatory  authorities  of  adverse  experiences  with  the  product,  providing  the  regulatory  authorities  with
updated  safety  and  efficacy  information,  product  sampling  and  distribution  requirements,  and  complying  with  promotion  and  advertising  requirements,  which  include,  among
others, standards for direct-to-consumer advertising, restrictions on promoting products for uses or in patient populations that are not described in the product’s approved labeling
(known  as  “off-label  use”),  limitations  on  industry-sponsored  scientific  and  educational  activities,  and  requirements  for  promotional  activities  involving  the  internet. Although
physicians may prescribe legally available drugs and biologics for off-label uses, manufacturers may not market or promote such off-label uses.

Modifications or enhancements to the product or its labeling or changes of the site of manufacture are often subject to the approval of the FDA and other regulators, which

may or may not be received or may result in a lengthy review process. Prescription drug promotional materials must be submitted to the FDA in conjunction with their first use.

In the United States, once a product is approved, its manufacture is subject to comprehensive and continuing regulation by the FDA. The FDA regulations require that
products be manufactured in specific approved facilities and in accordance with cGMPs. We rely, and expect to continue to rely, on third parties for the production of clinical and
commercial quantities of our products in accordance with cGMP regulations. cGMP regulations require,

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among other things, quality control and quality assurance as well as the corresponding maintenance of records and documentation and the obligation to investigate and correct any
deviations from cGMP. Manufacturers and other entities involved in the manufacture and distribution of approved products are required to register their establishments with the
FDA  and  certain  state  agencies,  and  are  subject  to  periodic  unannounced  inspections  by  the  FDA  and  certain  state  agencies  for  compliance  with  cGMP  and  other  laws.
Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain cGMP compliance. These regulations also
impose  certain  organizational,  procedural  and  documentation  requirements  with  respect  to  manufacturing  and  quality  assurance  activities.  BLA  holders  using  contract
manufacturers, laboratories or packagers are responsible for the selection and monitoring of qualified firms, and, in certain circumstances, qualified suppliers to these firms. These
firms and, where applicable, their suppliers are subject to inspections by the FDA at any time, and the discovery of violative conditions, including failure to conform to cGMP,
could result in enforcement actions that interrupt the operation of any such facilities or the ability to distribute products manufactured, processed or tested by them. Discovery of
problems with a product after approval may result in restrictions on a product, manufacturer, or holder of an approved BLA, including, among other things, recall or withdrawal of
the product from the market.

The FDA also may require post-approval testing, sometimes referred to as Phase 4 testing, REMS and post-marketing surveillance to monitor the effects of an approved
product or place conditions on an approval that could restrict the distribution or use of the product. Discovery of previously unknown problems with a product or the failure to
comply with applicable FDA requirements can have negative consequences, including adverse publicity, judicial or administrative enforcement, untitled or warning letters from the
FDA, mandated corrective advertising or communications with doctors, and civil or criminal penalties, among others. Newly discovered or developed safety or effectiveness data
may  require  changes  to  a  product’s  approved  labeling,  including  the  addition  of  new  warnings  and  contraindications,  and  also  may  require  the  implementation  of  other  risk
management measures. Also, new government requirements, including those resulting from new legislation, may be established, or the FDA’s policies may change, which could
delay or prevent regulatory approval of our products under development.

Other Regulatory Matters

Manufacturing, sales, promotion and other activities following product approval are also subject to regulation by numerous regulatory authorities in addition to the FDA,
including,  in  the  United  States,  the  Centers  for  Medicare  &  Medicaid  Services,  or  CMS,  other  divisions  of  the  Department  of  Health  and  Human  Services  (e.g.,  the  Office  of
Inspector General, or OIG, and Office for Civil Rights), the Drug Enforcement Administration, the Consumer Product Safety Commission, the Federal Trade Commission, the
Occupational  Safety  &  Health  Administration,  the  Environmental  Protection  Agency  and  state  and  local  governments.  In  the  United  States,  sales,  marketing  and
scientific/educational programs must also comply with federal and state fraud and abuse laws, data privacy and security laws, transparency laws, and pricing and reimbursement
requirements in connection with governmental payor programs, among others. The handling of any controlled substances must comply with the U.S. Controlled Substances Act
and  Controlled  Substances  Import  and  Export  Act.  Products  must  meet  applicable  child-resistant  packaging  requirements  under  the  U.S.  Poison  Prevention  Packaging  Act.
Manufacturing, sales, promotion and other activities are also potentially subject to federal and state consumer protection and unfair competition laws.

The  distribution  of  pharmaceutical  products  is  subject  to  additional  requirements  and  regulations,  including  extensive  record-keeping,  licensing,  storage  and  security

requirements intended to prevent the unauthorized sale of pharmaceutical products.

The  failure  to  comply  with  regulatory  requirements  subjects  firms  to  possible  legal  or  regulatory  action.  Depending  on  the  circumstances,  failure  to  meet  applicable
regulatory requirements can result in criminal prosecution, fines or other penalties, injunctions, recall or seizure of products, total or partial suspension of production, denial or
withdrawal of product approvals, or refusal to allow a firm to enter into supply contracts, including government contracts. In addition, even if a firm complies with FDA and other
requirements, new information regarding the safety or efficacy of a product could lead the FDA to modify or withdraw product approval. Prohibitions or restrictions on sales or
withdrawal of future products marketed by us could materially affect our business in an adverse way.

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Changes  in  regulations,  statutes  or  the  interpretation  of  existing  regulations  could  impact  our  business  in  the  future  by  requiring,  for  example:  (i)  changes  to  our
manufacturing arrangements; (ii) additions or modifications to product labeling; (iii) the recall or discontinuation of our products; or (iv) additional record-keeping requirements. If
any such changes were to be imposed, they could adversely affect the operation of our business.

U.S. Patent Term Restoration and Marketing Exclusivity

Depending upon the timing, duration and specifics of the FDA approval of our drug product candidates, some of our U.S. patents may be eligible for limited patent term
extension  under  the  Drug  Price  Competition  and  Patent  Term  Restoration  Act  of  1984,  commonly  referred  to  as  the  Hatch-Waxman  Amendments.  The  Hatch-Waxman
Amendments  permit  a  patent  restoration  term  of  up  to  five  years  as  compensation  for  patent  term  lost  during  product  development  and  the  FDA  regulatory  review  process.
However, patent term restoration cannot extend the remaining term of a patent beyond a total of 14 years from the product’s approval date. The patent term restoration period is
generally one-half the time between the effective date of an IND and the submission date of a BLA plus the time between the submission date of a BLA and the approval of that
application, except that the review period is reduced by any time during which the applicant failed to exercise due diligence. Only one patent applicable to an approved drug is
eligible for the extension and the application for the extension must be submitted prior to the expiration of the patent. The U.S. PTO, in consultation with the FDA, reviews and
approves the application for any patent term extension or restoration. In the future, we may apply for restoration of patent term for our currently owned or licensed patents to add
patent life beyond its current expiration date, depending on the expected length of the clinical trials and other factors involved in the filing of the relevant BLA.

An abbreviated approval pathway for biological products shown to be biosimilar to, or interchangeable with, an FDA-licensed reference biological product was created
by the Biologics Price Competition and Innovation Act of 2009, or BPCI Act, which was part of the Patient Protection and Affordable Care Act, as amended by the Health Care
and Education Reconciliation Act of 2010, or collectively the ACA. This amendment to the PHSA attempts to minimize duplicative testing. Biosimilarity, which requires that the
biological  product  be  highly  similar  to  the  reference  product  notwithstanding  minor  differences  in  clinically  inactive  components  and  that  there  be  no  clinically  meaningful
differences between the product and the reference product in terms of safety, purity, and potency, can be shown through analytical studies, animal studies, and a clinical trial or
trials. Interchangeability requires that a biological product be biosimilar to the reference product and that the product can be expected to produce the same clinical results as the
reference product in any given patient and, for products administered multiple times, that the product and the reference product may be switched after one has been previously
administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biological product. However, complexities associated with the
larger, and often more complex, structure of biological products as compared to small molecule drugs, as well as the processes by which such products are manufactured, pose
significant hurdles to implementation that are still being worked out by the FDA.

A reference biological product is granted twelve years of exclusivity from the time of first licensure of the product, and the FDA will not accept an application for a
biosimilar or interchangeable product based on the reference biological product until four years after first licensure. “First licensure” typically means the initial date the particular
product at issue was licensed in the United States. This does not include a supplement for the biological product or a subsequent application by the same sponsor or manufacturer
of the biological product (or licensor, predecessor in interest, or other related entity) for a change that results in a new indication, route of administration, dosing schedule, dosage
form, delivery system, delivery device, or strength, unless that change is a modification to the structure of the biological product and such modification changes its safety, purity,
or potency. Whether  a  subsequent  application,  if  approved,  warrants  exclusivity  as  the  “first  licensure”  of  a  biological  product  is  determined  on  a  case-by-case  basis  with  data
submitted by the sponsor.

Pediatric exclusivity is another type of regulatory market exclusivity in the United States. Pediatric exclusivity, if granted, adds six months to existing exclusivity periods
and patent terms. This six-month exclusivity, which attaches to the twelve-year exclusivity period for reference biologics, may be granted based on the voluntary completion of a
pediatric trial in accordance with an FDA-issued “Written Request” for such a trial.

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Pricing and Reimbursement

United States

Sales of our products will depend, in part, on the extent to which our products, once approved, will be covered and reimbursed by third-party payors, such as government
health  programs,  commercial  insurance  and  managed  healthcare  organizations.  These  third-party  payors  are  increasingly  reducing  reimbursements  for  medical  products  and
services. The process for determining whether a third-party payor will provide coverage for a drug product, including a biologic, typically is separate from the process for setting
the price of a drug product or for establishing the reimbursement rate that a payor will pay for the drug product once coverage is approved. Third-party payors may limit coverage
to specific drug products on an approved list, also known as a formulary, which might not include all of the approved drugs for a particular indication.

In order to secure coverage and reimbursement for any drug product candidate that might be approved for sale, we may need to conduct expensive pharmacoeconomic
studies in order to demonstrate the medical necessity and cost-effectiveness of the drug product candidate, in addition to the costs required to obtain FDA or other comparable
regulatory approvals. Whether or not we conduct such studies, our drug product candidates may not be considered medically necessary or cost-effective. A third-party payor’s
decision to provide coverage for a drug product does not imply that an adequate reimbursement rate will be approved. Third party reimbursement may not be sufficient to enable us
to maintain price levels high enough to realize an appropriate return on our investment in product development. In the United States, the principal decisions about reimbursement
for new drug products are typically made by the U.S. Centers for Medicare and Medicaid Services, or CMS, an agency within the U.S. Department of Health and Human Services,
or HHS. CMS decides whether and to what extent a new drug product will be covered and reimbursed under Medicare, and private payors tend to follow CMS to a substantial
degree. However, no uniform policy of coverage and reimbursement for drug products exists among third-party payors and coverage and reimbursement levels for drug products
can  differ  significantly  from  payor  to  payor. Additionally,  one  third-party  payor’s  decision  to  cover  a  particular  product  or  service  does  not  ensure  that  other  payors  will  also
provide coverage for the product or service, and the level of coverage and reimbursement can differ significantly from payor to payor. As a result, the coverage determination
process will often require us to provide scientific and clinical support for the use of our products to each payor separately and can be a time-consuming process, with no assurance
that coverage and adequate reimbursement will be applied consistently or obtained in the first instance.

The containment of healthcare costs has become a priority of federal and state governments, and the prices of drugs, including biologics, have been a focus in this effort.
The U.S. government, state legislatures and foreign governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions
on reimbursement and requirements for substitution of generic products. In many countries, the prices of drug products are subject to varying price control mechanisms as part of
national health systems. In general, the prices of drug products under such systems are substantially lower than in the United States. Other countries allow companies to fix their
own prices for drug products, but monitor and control company profits. Accordingly, in markets outside the United States, the reimbursement for drug products may be reduced
compared with the United States. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and
measures, could further limit our net revenue and results. Decreases in third-party reimbursement for our drug product candidate or a decision by a third-party payor to not cover
our  drug  product  candidate  could  reduce  physician  usage  of  the  drug  product  candidate  and  have  a  material  adverse  effect  on  our  sales,  results  of  operations  and  financial
condition.

Outside of the United States, the pricing of pharmaceutical products is subject to governmental control in many countries. For example, in the European Union, pricing
and reimbursement schemes vary widely from country to country. Some countries provide that products may be marketed only after a reimbursement price has been approved.
Some  countries  may  require  the  completion  of  additional  studies  that  compare  the  cost  effectiveness  of  a  particular  therapy  to  currently  available  therapies  or  so-called  health
technology assessments, in order to obtain reimbursement or pricing approval. Other countries may allow companies to fix their own prices for products, but monitor and control
product volumes and issue guidance to physicians to limit prescriptions. Efforts to control prices and utilization of pharmaceutical products will likely continue as countries attempt
to manage healthcare expenditures.

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Other Healthcare Laws and Compliance Requirements

Healthcare providers, physicians, and third-party payors will play a primary role in the recommendation and prescription of any products for which we obtain marketing
approval. Our business operations in the United States and our current and future arrangements with clinical investigators, healthcare providers, consultants, third-party payors and
patients may expose us to broadly applicable federal and state 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  any  drugs  for  which  we  obtain  marketing  approval.  In  the  United  States,  these  laws  include:  the  federal Anti-
Kickback Statute, the False Claims Act, and HIPAA.

The Anti-Kickback Statute makes it illegal for any person, including a prescription drug manufacturer (or a party acting on its behalf), to knowingly and willfully solicit,
receive, offer or pay any remuneration, directly or indirectly, in cash or in kind, that is intended to induce or reward referrals, including the purchase, recommendation, order or
prescription of a particular drug, for which payment may be made under a federal healthcare program, such as Medicare or Medicaid. Violations of this law are punishable by
imprisonment, criminal fines, administrative civil money penalties and exclusion from participation in federal healthcare programs. In addition, a person or entity does not need to
have actual knowledge of the statute or specific intent to violate it. Moreover, the ACA provides that the government may assert that a claim including items or services resulting
from a violation of the federal Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the federal civil False Claims Act. On December 2, 2020, the Office of
Inspector General, or OIG, published further modifications to the federal Anti-Kickback Statute. Under the final rules, OIG added safe harbor protections under the Anti-Kickback
Statute  for  certain  coordinated  care  and  value-based  arrangements  among  clinicians,  providers,  and  others.  This  rule  (with  exceptions)  became  effective  January  19,  2021.
Implementation of this change and new safe harbors for point-of-sale reductions in price for prescription pharmaceutical products and pharmacy benefit manager service fees are
currently under review by the Biden administration and may be amended or repealed. We continue to evaluate what effect, if any, the rule will have on our business.

Although we would not submit claims directly to payors, drug manufacturers can be held liable under the federal civil False Claims Act, which imposes civil penalties,
including through civil whistleblower or qui tam actions, against individuals or entities (including manufacturers) for, among other things, knowingly presenting, or causing to be
presented to federal programs (including Medicare and Medicaid) claims for items or services, including drugs, that are false or fraudulent, claims for items or services not provided
as claimed, or claims for medically unnecessary items or services. Penalties for a False Claims Act violation include three times the actual damages sustained by the government,
plus mandatory civil penalties for each separate false claim, the potential for exclusion from participation in federal healthcare programs and, although the federal False Claims Act
is  a  civil  statute,  conduct  that  results  in  a  False  Claims Act  violation  may  also  implicate  various  federal  criminal  statutes.  The  government  may  deem  manufacturers  to  have
“caused” the submission of false or fraudulent claims by, for example, providing inaccurate billing or coding information to customers or promoting a product off- label. Claims
which  include  items  or  services  resulting  from  a  violation  of  the  federal Anti-Kickback  Statute  are  false  or  fraudulent  claims  for  purposes  of  the  False  Claims Act.  Our  future
marketing and activities relating to the reporting of wholesaler or estimated retail prices for our products, if approved, the reporting of prices used to calculate Medicaid rebate
information  and  other  information  affecting  federal,  state  and  third-party  reimbursement  for  our  products,  and  the  sale  and  marketing  of  our  product  candidates,  are  subject  to
scrutiny under this law.

The civil monetary penalties statute imposes penalties against any person or entity that, among other things, is determined to have presented or caused to be presented a

claim to a federal health program that the person knows or should know is for an item or service that was not provided as claimed or is false or fraudulent.

Additionally,  we  may  be  subject  to  data  privacy  and  security  regulations  by  both  the  federal  government  and  states  in  which  we  conduct  our  business.  For  example,
HIPAA created new federal criminal statutes that prohibit among other things, knowingly and willfully executing, or attempting to execute, a scheme to defraud or to obtain, by
means of false or fraudulent pretenses, representations or promises, any money or property owned by, or under the control or custody of, any healthcare benefit program, including
private third party payors, knowingly and willfully embezzling or stealing from a healthcare benefit program, willfully obstructing a criminal investigation of a healthcare offense,
and knowingly and willfully falsifying, concealing or covering up by trick, scheme or device, a material fact or making any materially false, fictitious or fraudulent statement in
connection with the delivery of or

47

 
payment for healthcare benefits, items or services. Like the federal Anti-Kickback Statute a person or entity does not need to have actual knowledge of the statute or specific intent
to violate it in order to have committed a violation.

HIPAA, as amended by HITECH, and their implementing regulations, mandates, among other things, the adoption of uniform standards for the electronic exchange of
information in common healthcare transactions, as well as standards relating to the privacy and security of individually identifiable health information, which require the adoption
of administrative, physical and technical safeguards to protect such information. Among other things, HITECH makes HIPAA’s security standards directly applicable to business
associates, defined as independent contractors or agents of covered entities, which include certain health care providers, health plans, and healthcare clearinghouses, that create,
receive or obtain protected health information in connection with providing a service for or on behalf of a covered entity. HITECH also increased the civil and criminal penalties
that may be imposed against covered entities and business associates, and gave state attorneys general new authority to file civil actions for damages or injunctions in federal courts
to enforce the federal HIPAA laws and seek attorney’s fees and costs associated with pursuing federal civil actions. In addition, certain state laws govern the privacy and security of
health information in certain circumstances, some of which are more stringent than HIPAA and many of which differ from each other in significant ways and may not have the
same effect, thus complicating compliance efforts. Failure to comply with these laws, where applicable, can result in the imposition of significant civil and criminal penalties.

Further,  the  federal  Physician  Payments  Sunshine Act,  or  the  Sunshine Act,  within  the ACA,  and  its  implementing  regulations,  require  that  certain  manufacturers  of
drugs, devices, biological and medical supplies for which payment is available under Medicare, Medicaid or the Children’s Health Insurance Program (with certain exceptions)
report annually to CMS information related to certain payments or other transfers of value made or distributed to physicians (defined to include doctors, dentists, optometrists,
podiatrists and chiropractors) and teaching hospitals, or to entities or individuals at the request of, or designated on behalf of, physicians, certain other healthcare professionals, and
teaching  hospitals  and  to  report  annually  certain  ownership  and  investment  interests  held  by  physicians,  certain  other  healthcare  professionals,  and  their  immediate  family
members. Effective January 1, 2022, these reporting obligations will extend to include transfers of value made to certain non-physician providers such as physician assistants and
nurse practitioners. In addition, many states also govern the reporting of payments or other transfers of value, many of which differ from each other in significant ways, are often
not pre-empted, and may have a more prohibitive effect than the Sunshine Act, thus further complicating compliance efforts.

Similar federal, state and foreign fraud and abuse 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. Such laws are generally broad and are enforced by various state agencies and private actions. Also, many states have similar
fraud and abuse statutes or regulations that may be broader in scope and may apply regardless of payor, in addition to items and services reimbursed under Medicaid and other state
programs. Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant federal government
compliance  guidance,  and  require  drug  manufacturers  to  report  information  related  to  payments  and  other  transfers  of  value  to  physicians  and  other  healthcare  providers  or
marketing expenditures.

In  order  to  distribute  products  commercially,  we  must  comply  with  state  laws  that  require  the  registration  of  manufacturers  and  wholesale  distributors  of  drug  and
biological products in a state, including, in certain states, manufacturers and distributors who ship products into the state even if such manufacturers or distributors have no place of
business within the state. Some states also impose requirements on manufacturers and distributors to establish the pedigree of product in the chain of distribution, including some
states that require manufacturers and others to adopt new technology capable of tracking and tracing product as it moves through the distribution chain. Several states have enacted
legislation  requiring  pharmaceutical  and  biotechnology  companies  to  establish  marketing  compliance  programs,  file  periodic  reports  with  the  state,  make  periodic  public
disclosures on sales, marketing, pricing, clinical trials and other activities, and/or register their sales representatives, as well as to prohibit pharmacies and other healthcare entities
from providing certain physician prescribing data to pharmaceutical and biotechnology companies for use in sales and marketing, and to prohibit certain other sales and marketing
practices. All of our activities are potentially subject to federal and state consumer protection and unfair competition laws.

48

 
The scope and enforcement of each of these laws is uncertain and subject to rapid change in the current environment of healthcare reform, especially in light of the lack of
applicable  precedent  and  regulations.  Federal  and  state  enforcement  bodies  have  recently  increased  their  scrutiny  of  interactions  between  healthcare  companies  and  healthcare
providers,  which  has  led  to  a  number  of  investigations,  prosecutions,  convictions  and  settlements  in  the  healthcare  industry.  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,  disgorgement,  contractual  damages,  reputational  harm,  diminished  profits  and  future  earnings,  individual  imprisonment,
exclusion  of  drugs  from  government  funded  healthcare  programs,  such  as  Medicare  and  Medicaid,  and  the  curtailment  or  restructuring  of  our  operations,  any  of  which  could
adversely affect our ability to operate our business and our financial results. If any of the physicians or other healthcare providers or entities with whom we expect to do business is
found to be not in compliance with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare
programs. Ensuring business arrangements comply with applicable healthcare laws, as well as responding to possible investigations by government authorities, can be time- and
resource- consuming and can divert a company’s attention from the business.

Current and Future Legislation

In the United States and some foreign jurisdictions, there have been, and likely will continue to be, a number of legislative and regulatory changes and proposed changes

regarding the healthcare system directed at broadening the availability of healthcare, improving the quality of healthcare, and containing or lowering the cost of healthcare.

For example, in March 2010, the ACA was enacted in the United States. The ACA includes measures that have significantly changed, and are expected to continue to
significantly change, the way healthcare is financed by both governmental and private insurers. Among the provisions of the ACA of greatest importance to the pharmaceutical
industry are that the ACA:

1.

2.

3.

4.

5.

6.

7.

made several changes to the Medicaid Drug Rebate Program, including increasing pharmaceutical manufacturers’ rebate liability by raising the minimum basic
Medicaid rebate on average manufacturer price, or AMP, on most branded prescription drugs and adding a new rebate calculation for “line extensions” ( i.e.,
new formulations, such as extended release formulations) of solid oral dosage forms of branded products, as well as potentially impacting their rebate liability
by modifying the statutory definition of AMP;

imposed a requirement on manufacturers of branded drugs to provide a 50% point-of-sale discount (increased to 70% pursuant to the Bipartisan Budget Act of
2018, effective as of January 1, 2019) off the negotiated price of branded drugs dispensed to Medicare Part D beneficiaries in the coverage gap (i.e., “donut
hole”) as a condition for a manufacturer’s outpatient drugs being covered under Medicare Part D;

extended a manufacturer’s Medicaid rebate liability to covered drugs dispensed to individuals who are enrolled in Medicaid managed care organizations;

expanded the entities eligible for discounts under the 340B Drug Discount Program;

established a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs that are inhaled,
infused, instilled, implanted, or injected;

imposed  an  annual,  nondeductible  fee  on  any  entity  that  manufactures  or  imports  certain  branded  prescription  drugs,  apportioned  among  these  entities
according to their market share in certain government healthcare programs, and

established  a  new  Patient-Centered  Outcomes  Research  Institute  to  oversee,  identify  priorities  in,  and  conduct  comparative  clinical  effectiveness  research,
along  with  funding  for  such  research.  The  research  conducted  by  the  Patient-Centered  Outcomes  Research  Institute  may  affect  the  market  for  certain
pharmaceutical products. The ACA established the Center for Medicare and Medicaid Innovation within CMS to test innovative payment and service delivery
models to lower Medicare and Medicaid spending,

49

 
 
 
 
 
 
 
 
potentially  including  prescription  drug  spending.  Funding  has  been  allocated  to  support  the  mission  of  the  Center  for  Medicare  and  Medicaid  Innovation
through 2019.

Since its enactment, there have been numerous judicial, administrative, executive, and legislative challenges to certain aspects of the ACA. Various portions of the ACA
are currently undergoing constitutional challenges in the Fifth Circuit Court and the United  States  Supreme  Court.  The  former  Trump Administration  issued  various  Executive
Orders  eliminating  cost  sharing  subsidies  and  various  provisions  that  would  impose  a  fiscal  burden  on  states  or  a  cost,  fee,  tax,  penalty  or  regulatory  burden  on  individuals,
healthcare  providers,  health  insurers,  or  manufacturers  of  pharmaceuticals  or  medical  devices,  and  Congress  has  introduced  several  pieces  of  legislation  aimed  at  significantly
revising or repealing the ACA. It is unclear whether the ACA will be further amended, and we cannot predict what affect further changes to the ACA would have on our business,
especially under the new Biden administration.

Other legislative changes have been proposed and adopted in the United States since the ACA was enacted. In August 2011, the Budget Control Act of 2011, among
other things, created measures for spending reductions by Congress. A Joint Select Committee on Deficit Reduction, tasked with recommending a targeted deficit reduction of at
least $1.2 trillion for the years 2013 through 2021, was unable to reach required goals, thereby triggering the legislation’s automatic reduction to several government programs.
This includes aggregate reductions of Medicare payments to providers up to 2% per fiscal year, which went into effect in April 2013, following passage of the Bipartisan Budget
Act of 2013 and subsequent legislation, and will remain in effect through 2030 unless additional congressional action is taken. However, pursuant to the Coronavirus Aid, Relief
and  Economic  Security Act,  or  CARES Act,  the  2%  Medicare  sequester  reductions  have  been  suspended  from  May  1,  2020  through  March  31,  2021  due  to  the  COVID-19
pandemic. Proposed legislation, if passed, would extend this suspension until the end of the pandemic. Further, in January 2013, President Obama signed into law the American
Taxpayer  Relief Act  of  2012,  which,  among  other  things,  further  reduced  Medicare  payments  to  several  providers,  including  hospitals,  imaging  centers  and  cancer  treatment
centers, and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. Any reduction in reimbursement from
Medicare or other government programs may result in a similar reduction in payments from private payors, which may adversely affect our future profitability. Additionally, there
has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices.

On May 30, 2018, the Trickett Wendler, Frank Mongiello, Jordan McLinn, and Matthew Bellina Right to Try Act of 2017, or the Right to Try Act, was signed into law.
The law, among other things, provides a federal framework for certain patients to request access to certain investigational new drug products that have completed a Phase I clinical
trial and that are undergoing investigation for FDA approval. There is no obligation for a pharmaceutical manufacturer to make its drug products available to eligible patients as a
result of the Right to Try Act.

In addition, there has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices. Specifically, there have
been several recent U.S. Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more transparency to drug pricing,
review the relationship between pricing and manufacturer patient assistance programs, and reform government program reimbursement methodologies for drugs. For example, the
former  Trump  administration’s  budget  proposal  for  fiscal  year  2021  included  a  $135  billion  allowance  to  support  legislative  proposals  seeking  to  reduce  drug  prices,  increase
competition,  lower  out-of-pocket  drug  costs  for  patients,  and  increase  patient  access  to  lower-cost  generic  and  biosimilar  drugs.  On  March  10,  2020,  the  former  Trump
administration  sent  “principles”  for  drug  pricing  to  Congress,  calling  for  legislation  that  would,  among  other  things,  cap  Medicare  Part  D  beneficiary  out-of-pocket  pharmacy
expenses, provide an option to cap Medicare Part D beneficiary monthly out-of-pocket expenses, and place limits on pharmaceutical price increases. Moreover, in May 2018, the
former  Trump  administration  also  previously  released  its  “Blueprint  to  Lower  Drug  Prices  and  Reduce  Out-of-Pocket  Costs,”  or  the  Blueprint.  The  Blueprint  contains  several
potential regulatory actions and legislative recommendations aimed at lowering prescription drug prices, including measures to promote innovation and competition for biologics,
changes to Medicare Part D to give plan sponsors more leverage when negotiating prices with manufacturers, and updating the Medicare drug-pricing dashboard to make price
increases and generic competition more transparent. In addition, HHS released a Request for Information, or RFI, soliciting public input on ways to lower drug pricing. HHS has
already started the process of soliciting feedback on some of these measures and, at the same, is immediately implementing others under its existing authority. For example, in May
2019, CMS issued a final rule to allow Medicare Advantage Plans the option of using step therapy, a type of prior authorization, for Part B drugs beginning January 1, 2020. This
final rule codified CMS’s policy change that was effective January 1, 2019. It is unclear

50

 
 
whether the Biden administration will challenge, reverse, revoke or otherwise modify these executive and administrative actions after January 20, 2021.

In addition, there have been several changes to the 340B drug pricing program, which imposes ceilings on prices that drug manufacturers can charge for medications sold
to certain health care facilities. It is unclear how these developments could affect covered hospitals who might purchase our future products and affect the rates we may charge such
facilities for our approved products in the future, if any.

On July 24, 2020 and September 13, 2020, President Trump announced several executive orders related to prescription drug pricing that seek to implement several of the
administration's proposals. In response, the FDA released a final rule on September 24, 2020, which went into effect on November 30, 2020, providing guidance for states to build
and submit importation plans for drugs from Canada. Further, on November 20, 2020 CMS issued an Interim Final Rule implementing the Most Favored Nation, or MFN, Model
under which Medicare Part B reimbursement rates will be calculated for certain drugs and biologicals based on the lowest price drug manufacturers receive in Organization for
Economic  Cooperation  and  Development  countries  with  a  similar  gross  domestic  product  per  capita.    However,  in  response  to  a  lawsuit  filed  by  several  industry  groups,  on
December 28, the U.S. District Court for the Northern District of California issued a nationwide preliminary injunction enjoining government defendants from implementing the
MFN Rule pending completion of notice-and-comment procedures under the Administrative Procedure Act. On January 13, 2021, in a separate lawsuit brought by industry groups
in  the  U.S.  District  of  Maryland,  the  government  defendants  entered  a  joint  motion  to  stay  litigation  on  the  condition  that  the  government  would  not  appeal  the  preliminary
injunction granted in the U.S. District Court for the Northern District of California and that performance for any final regulation stemming from the MFN Interim Final Rule shall
not commence earlier than 60 days after publication of that regulation in the Federal Register. Further, authorities in Canada have passed rules designed to safeguard the Canadian
drug  supply  from  shortages.  If  implemented,  importation  of  drugs  from  Canada  and  the  MFN  Model  may  materially  and  adversely  affect  the  price  we  receive  for  any  of  our
product candidates.

Additionally, on December 2, 2020, HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors
under  Part  D,  either  directly  or  through  pharmacy  benefit  managers,  unless  the  price  reduction  is  required  by  law.  The  rule  also  creates  a  new  safe  harbor  for  price  reductions
reflected at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit managers and manufacturers. Pursuant to an order entered by the
U.S. District Court for the District of Columbia, the portion of the rule eliminating safe harbor protection for certain rebates related to the sale or purchase of a pharmaceutical
product from a manufacturer to a plan sponsor under Medicare Part D has been delayed to January 1, 2023. Further, implementation of this change and new safe harbors for point-
of-sale reductions in price for prescription pharmaceutical products and pharmacy benefit manager service fees are currently under review by the Biden administration and may be
amended  or  repealed.  While  many  of  the  proposed  measures  will  require  authorization  through  additional  legislation  to  become  effective,  and  the  Biden Administration  may
reverse or otherwise change these measures, Congress has indicated that it will continue to seek new legislative, administrative and/or additional measures to control drug costs.

We cannot predict what healthcare reform initiatives may be adopted in the future. Further federal, state and foreign legislative and regulatory developments are likely,
and we expect ongoing initiatives to increase pressure on drug pricing. Such reforms could have an adverse effect on anticipated revenues from product candidates and may affect
our overall financial condition and ability to develop product candidates.

The Foreign Corrupt Practices Act

The FCPA prohibits any U.S. individual or business from paying, offering, or authorizing payment or offering of anything of value, directly or indirectly, to any foreign
official, political party or candidate for the purpose of influencing any act or decision of the foreign entity in order to assist the individual or business in obtaining or retaining
business. The FCPA also obligates companies whose securities are listed in the United States to comply with accounting provisions requiring the company to maintain books and
records  that  accurately  and  fairly  reflect  all  transactions  of  the  corporation,  including  international  subsidiaries,  and  to  devise  and  maintain  an  adequate  system  of  internal
accounting controls for international operations.

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Additional Regulation

In addition to the foregoing, state and federal laws regarding environmental protection and hazardous substances, including the Occupational Safety and Health Act, the
Resource  Conservancy  and  Recovery Act  and  the  Toxic  Substances  Control Act,  affect  our  business.  These  and  other  laws  govern  our  use,  handling  and  disposal  of  various
biological, chemical and radioactive substances used in, and wastes generated by, our operations. If our operations result in contamination of the environment or expose individuals
to  hazardous  substances,  we  could  be  liable  for  damages  and  governmental  fines.  We  believe  that  we  are  in  material  compliance  with  applicable  environmental  laws  and  that
continued compliance therewith will not have a material adverse effect on our business. We cannot predict, however, how changes in these laws may affect our future operations.

Europe / Rest of World Government Regulation

In addition to regulations in the United States, we may be subject to a variety of regulations in other jurisdictions that we may in the future select governing, among other
things,  clinical  trials  and  any  commercial  sales  and  distribution  of  our  products.  Whether  or  not  we  obtain  FDA  approval  of  a  product,  we  would  need  to  obtain  the  requisite
approvals from regulatory authorities in foreign countries prior to the commencement of clinical trials or marketing of the product in those countries. Certain countries outside of
the United States have a similar process that requires the submission of a clinical trial application much like the IND prior to the commencement of human clinical trials. In the EU,
for  example,  a  clinical  trial  application  must  be  submitted  to  each  country’s  national  health  authority  and  an  independent  ethics  committee,  much  like  the  FDA  and  IRB,
respectively. Once the clinical trial application is approved in accordance with a country’s requirements, clinical trial development may proceed. Because biologically sourced raw
materials are subject to unique contamination risks, their use may be restricted in some countries.

The requirements and process governing the conduct of clinical trials, product licensing, pricing and reimbursement vary from country to country. In all cases, the clinical

trials must be conducted in accordance with GCP and the applicable regulatory requirements and the ethical principles that have their origin in the Declaration of Helsinki.

To obtain regulatory approval of an investigational drug or biological product under EU regulatory systems, we must submit an MAA. The application used to file the

BLA in the United States is similar to that required in the EU, with the exception of, among other things, country-specific document requirements.

For  other  countries  outside  of  the  EU,  such  as  countries  in  Eastern  Europe,  Latin America  or Asia,  the  requirements  governing  the  conduct  of  clinical  trials,  product
licensing, pricing and reimbursement vary from country to country. In all cases, again, the clinical trials must be conducted in accordance with GCP and the applicable regulatory
requirements and the ethical principles that have their origin in the Declaration of Helsinki.

If  we  or  our  potential  collaborators  fail  to  comply  with  applicable  foreign  regulatory  requirements,  we  may  be  subject  to,  among  other  things,  fines,  suspension  or

withdrawal of regulatory approvals, product recalls, seizure of products, operating restrictions and criminal prosecution.

European Union General Data Protection Regulation

In  addition  to  EU  regulations  related  to  the  approval  and  commercialization  of  our  products,  we  may  be  subject  to  the  EU’s  General  Data  Protection  Regulation,  or
GDPR.  The  GDPR  imposes  stringent  requirements  for  controllers  and  processors  of  personal  data  of  persons  in  the  EU,  including,  for  example,  more  robust  disclosures  to
individuals  and  a  strengthened  individual  data  rights  regime,  shortened  timelines  for  data  breach  notifications,  limitations  on  retention  of  information,  increased  requirements
pertaining  to  special  categories  of  data,  such  as  health  data,  and  additional  obligations  when  we  contract  with  third-party  processors  in  connection  with  the  processing  of  the
personal data. The GDPR also imposes strict rules on the transfer of personal data out of the European Union to the United States and other third countries. In addition, the GDPR
provides that EU member states may make their own further laws and regulations limiting the processing of personal data, including genetic, biometric or health data.

The GDPR applies extraterritorially, and we may be subject to the GDPR because of our data processing activities that involve the personal data of individuals located in
the European Union, such as in connection with our EU clinical trials. Failure to comply with the requirements of the GDPR and the applicable national data protection laws of the
EU member states may result in fines of up to €20,000,000 or up to 4% of the total worldwide annual turnover of the preceding financial year, whichever is higher, and other
administrative penalties. GDPR regulations

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may  impose  additional  responsibility  and  liability  in  relation  to  the  personal  data  that  we  process  and  we  may  be  required  to  put  in  place  additional  mechanisms  to  ensure
compliance with the new data protection rules.

Employees

As of December 31, 2020, we had 34 employees, 33 of whom were full-time. Of those, 27 were engaged in research and development activities. All company employees
are  located  in  the  United  States.  We  do  not  have  any  employees  that  are  represented  by  a  labor  union  or  covered  under  a  collective  bargaining  agreement.  We  consider  our
relationship with our employees to be good.

Corporate History and Trademarks

We were incorporated under the laws of the State of Delaware in April 2017 under the name Tycho Therapeutics, Inc. In August 2018, our corporate name was changed to
Cabaletta Bio, Inc. Our principal executive offices are located at 2929 Arch Street, Suite 600, Philadelphia, PA 19104 and our telephone number is (267) 759-3100. Our website
address is www.cabalettabio.com. We do not incorporate the information on or accessible through our website into this Annual Report on Form 10-K, and you should not consider
any information on, or that can be accessed through, our website to be part of this Annual Report on Form 10-K. We have included our website address in this Annual Report on
Form 10-K solely as an inactive textual reference.

We  view  our  operations  and  measure  our  business  as  one  reportable  segment. All  of  the  Company's  tangible  assets  are  held  in  the  United  States.  Refer  to  Note  2,

Summary of Significant Accounting Policies, to our financial statements appearing elsewhere in this Annual Report on Form 10-K for additional information.

We own or have rights to various trademarks, service marks and trade names that we use in connection with the operation of our business. This Annual Report on Form
10-K may also contain trademarks, service marks and trade names of third parties, which are the property of their respective owners. Our use or display of third parties’ trademarks,
service marks, trade names or products in this Annual Report on Form 10-K is not intended to, and does not imply a relationship with, or endorsement or sponsorship by us. Solely
for convenience, the trademarks, service marks and trade names referred to in this Annual Report on Form 10-K may appear without the ®, ™ or SM symbols, but the omission of
such references is not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or the right of the applicable owner of these
trademarks, service marks and trade names.

Available Information

Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to these reports filed or furnished pursuant to
Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are available free of charge on our website located at www.cabalettabio.com as soon as reasonably
practicable after they are filed with or furnished to the SEC. These reports are also available at the SEC’s Internet website at www.sec.gov.

A  copy  of  our  Corporate  Governance  Guidelines,  Code  of  Conduct  and  Business  Ethics  and  the  charters  of  the  Audit  Committee,  Compensation  Committee  and

Nominating and Corporate Governance Committee are posted on our website, www.cabalettabio.com, under the heading “Investors & Media.”

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  Item 1A. Risk Factors.

Our business involves material and other risks, some of which are summarized and described below. You should carefully consider the risks and uncertainties described
below, together with all of the other information contained in this Annual Report on Form 10-K, including "Management's Discussion and Analysis of Financial Condition and
Results of Operations" and the condensed financial statements and the related notes. If any of the following risks actually occur, it could harm our business, prospects, operating
results  and  financial  condition  and  future  prospects.  In  such  event,  the  market  price  of  our  common  stock  could  decline  and  you  could  lose  all  or  part  of  your  investment.
Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also impair our business operations. This Annual 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 below and elsewhere in this Annual Report.

Risks Related to Our Business, Technology and Industry

 Risks Related to Clinical Development

 We are early in our development efforts. If we are unable to advance our product candidates through clinical development, obtain regulatory approval and ultimately
commercialize our product candidates, or experience significant delays in doing so, our business will be materially harmed.

  We are early in our development efforts and we  have only initiated one clinical trial to date:  our DesCAARTes TM trial in June 2020. Our ability to generate product
revenues, which we do not expect will occur for many years, if ever, will depend heavily on the successful development and eventual commercialization of one or more of our
product candidates. Even if we are able to develop and commercialize a marketable product, we may face challenges generating revenue from product sales. The success of our
product candidates will depend on several factors, including the following:

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successful completion of preclinical studies resulting in data that is supportive of advancing to an IND submission;

successful submission and acceptance of INDs or comparable applications;

successful initiation of clinical trials;

demonstration of adequate safety to progress to a therapeutic dose level;

successful patient enrollment in and completion of clinical trials;

receipt and related terms of regulatory and marketing approvals and licensures from applicable regulatory authorities;

establishing commercial manufacturing capabilities or making arrangements with third-party manufacturers for clinical supply and commercial manufacturing
of our product candidates;

making arrangements with various medical divisions across hospitals for administration of our product candidates, including with cancer treatment centers to
conduct leukapheresis and with the relevant hospital divisions to perform infusion;

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

establishing sales, marketing and distribution and patient administration capabilities and launching commercial sales of our products, if and when licensed,
whether alone or in collaboration with others;

acceptance of our products, if and when licensed, by patients, the medical community and third-party payors;

effectively competing with other therapies targeting the same indications as our product candidates;

obtaining and maintaining third-party coverage and adequate reimbursement; and

maintaining a continued acceptable safety profile of our products following licensure.

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If we do not achieve one or more of these factors in a timely manner or at all, we could experience significant delays or be unable to successfully commercialize our
product  candidates,  which  would  materially  harm  our  business.  If  we  do  not  receive  regulatory  approvals  for  our  product  candidates,  we  may  not  be  able  to  continue  our
operations.

 Cellular therapies, including our engineered CAAR T product candidates, represent a novel approach to the treatment of B cell-mediated autoimmune diseases, which
creates significant challenges for us. Negative perception or increased regulatory scrutiny of any product candidates that we develop could adversely affect our ability
to conduct our business or obtain regulatory approvals for such product candidates.

Cellular therapies are a novel approach and negative perception or increased regulatory scrutiny of any product candidates that we develop could adversely affect our
ability to conduct our business or obtain regulatory approvals for such product candidates. Cellular therapies in general, and CAAR T cell therapies in particular, remain novel
therapies,  with  no  cellular  immunotherapies  licensed  to  date  in  the  United  States  or  the  European  Union  to  treat  autoimmune  diseases  or  alloimmune  responses.  CAAR  T  cell
therapies may not gain the acceptance of the public or the medical community. For example, CAR Ts and other cellular therapies have in some cases caused severe side effects,
including death, and their broader use may therefore be limited. Even if CAR Ts and other cellular therapies are accepted by the public and medical community in the short term,
long-term  adverse  events  observed  in  these  therapies  may  increase  negative  perception  and  regulatory  scrutiny. Although  our  CAAR  Ts  are  different  from  CAR  Ts  and  other
cellular therapies, they may be viewed in the same vein, limiting their market acceptance. Public perception may be influenced by claims that gene therapy, including the insertion
of a transgene, is unsafe, and products incorporating gene therapy may not gain the acceptance of the public or the medical community. The patient populations targeted by our
product candidates are also typically not at risk of near-term death, even if they may suffer life-threatening symptoms, so patients will need to deem the benefits of cell therapy to
be worth the risk of unknown potential adverse side effects. Our success will depend upon physicians who specialize in the treatment of B cell-mediated autoimmune diseases
targeted by our product candidates prescribing treatments that involve the use of our product candidates in lieu of, or in addition to, existing treatments with which they are more
familiar and for which greater clinical data may be available. Adverse events in clinical trials of our product candidates or in clinical trials of others developing similar products and
the resulting publicity, as well as any other adverse events in the field of cellular therapies, could result in a decrease in demand for any product that we may develop.

We are developing a pipeline of CAAR T product candidates that are intended for use in treating individuals with B cell-mediated autoimmune disease. Advancing these

novel product candidates creates significant challenges for us, including:

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manufacturing our product candidates to our specifications and in a timely manner to support our clinical trials, and, if licensed, commercialization;

sourcing clinical and, if licensed, commercial supplies for the materials used to manufacture our product candidates;

understanding and addressing variability in the quality and quantity of a subject’s T  cells,  which  could  ultimately  affect  our  ability  to  manufacture  clinical
supply and, if licensed, commercial supply of our product candidates in a reliable and consistent manner;

educating medical personnel regarding the potential side effect profile of our product candidates, if licensed, such as the potential adverse side effects related
to pemphigus flare from infusion of activated T cells or medication taper, cytokine release syndrome, or CRS, or other unexpected adverse effects of therapy
with our product candidates;

facilitating patient access to the limited number of facilities able to administer our product candidates, if licensed;

using  medicines  to  manage  adverse  side  effects  of  our  product  candidates  that  may  not  adequately  control  the  side  effects  and/or  may  have  a  detrimental
impact on the efficacy of the treatment;

potentially utilizing preconditioning agents in patients to enhance engraftment in advance of administering our product candidates, which may increase the risk
of adverse side effects;

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•

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obtaining  and  maintaining  regulatory  approval  for  our  product  candidates,  as  the  FDA  and  other  regulatory  authorities  have  limited  or  no  experience  with
development of engineered T cell therapies for the treatment of B cell-mediated autoimmune diseases;

establishing sales and marketing capabilities upon obtaining any regulatory approval to gain market acceptance of a novel therapy; and

managing costs of inputs and other supplies while scaling production.

In addition, preclinical murine and other animal models may not exist or be adequate for some or all of the B cell-mediated autoimmune diseases we choose to pursue in
our programs, and because we are early in the clinical development process, we are unable to predict whether there may be short-term or long-term effects from treatment with any
product candidates that we develop. In developing our product candidates, we have not exhaustively explored different options in the method for manufacturing CAAR T cells. We
may  find  our  existing  manufacturing  process  may  be  substantially  improved  with  future  design  or  process  changes,  necessitating  further  clinical  testing,  delaying  commercial
launch of our first products, and causing us to incur additional expenses. For example, while we have used a lentiviral vector in our manufacturing process, we may in the future
find that another viral vector or non-viral vector-based process offers advantages. Switching from one lentiviral vector to another or switching from lentiviral to another delivery
system would necessitate additional process development and clinical testing, and this may delay the development of existing product candidates.

In  addition,  we  do  not  know  the  doses  to  be  evaluated  in  pivotal  trials  or,  if  licensed,  commercially.  Finding  a  suitable  dose  may  delay  our  anticipated  clinical
development timelines. Our expectations with regard to our scalability and costs of manufacturing may vary significantly as we develop our product candidates and understand
these critical factors. We may experience delays in developing a sustainable, reproducible and scalable manufacturing process or transferring that process to commercial partners,
which may prevent us from completing our clinical studies or commercializing our product candidates on a timely or profitable basis, if at all.

Moreover, our product candidates may not perform successfully in clinical trials or may be associated with adverse events that distinguish them from the chimeric antigen
receptor  T,  or  CAR  T,  therapies  that  have  previously  been  licensed.  For  instance,  subjects  in  our  clinical  trials  will  be  infused  with  our  proposed  therapies,  and  may  possess
strongly activating soluble antibodies, which, are not present in oncology patients and when they interact with our infused product candidates, could result in potential adverse side
effects, such as CRS. Unexpected side effects or clinical outcomes would significantly impact our business. Adverse side effects caused by even one of our product candidates
could negatively affect our ability to develop future product candidates based on our CABA platform.

In  addition,  two  of  our  current  product  candidates,  DSG3/1-CAART  and  FVIII-CAART,  and  certain  of  our  future  product  candidates  may  require  introducing  large
transgenes into T cells, and lentiviral vectors may have too limited a genome capacity to accomplish this process. We currently use lentiviral vector transduction for transgene
delivery. However, lentiviral vectors have a limited genome capacity that restricts the size of the transgene that can be delivered using this vector system. For example, designing a
lentiviral vector that will have sufficient capacity to introduce DSG3 CAAR and DSG1 CAAR together into T cells may not be possible. In addition to reducing lentiviral vector
titers that may substantially increase the cost of gene transfer, it may be entirely unsuccessful, thus necessitating use of alternative strategies for transfer of these larger transgenes
into T cells.

Further,  the  clinical  study  requirements  of  the  FDA  and  other  regulatory  agencies  and  the  criteria  they  use  to  determine  the  safety,  potency  and  purity  of  a  product
candidate  are  determined  according  to  the  type,  complexity,  novelty  and  intended  use  and  market  of  the  potential  products.  The  regulatory  approval  process  for  novel  product
candidates such as ours is less clear, and can be more complex and consequently have higher development risk, be more expensive and take longer than for other, better known or
extensively studied pharmaceutical or other product candidates. Approvals by the FDA for existing cell therapies treating B cell-mediated diseases, such as Kymriah (Novartis
Pharmaceuticals Corporation) and Yescarta (Gilead Sciences, Inc.), may not be indicative of what the FDA may require for approval of our therapies. Approvals by any regulatory
agency may not be indicative of what any other regulatory agency may require for approval or what such regulatory agencies may require for approval in connection with new
product candidates. As we advance our product candidates, we will be required to consult with these regulatory agencies and comply with applicable requirements and guidelines.
If we fail to do so, we may be

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required to delay or discontinue development of such product candidates. These additional processes may result in a review and approval process that is longer than we otherwise
would have expected. More restrictive statutory regimes, government regulations or negative public opinion would have an adverse effect on our business, financial condition,
results of operations and prospects and may delay or impair the development and commercialization of our product candidates or demand for any products we may develop.

In addition, responses by agencies at the federal and state level to negative public perception or ethical concerns may result in new legislation or regulations that could
limit our ability to develop or commercialize any product candidates, obtain or maintain regulatory approval or otherwise achieve profitability. The FDA has expressed interest in
further regulating biotechnology products, such as cellular therapies. Agencies at both the federal and state level in the United States, as well as the U.S. Congressional committees
and  other  government  entities  or  governing  agencies  have  also  expressed  interest  in  further  regulating  the  biotechnology  industry.  Such  action  may  delay  or  prevent
commercialization of some or all of our product candidates. Adverse developments in clinical trials of cellular therapy products conducted by others may cause the FDA or other
oversight  bodies  to  change  the  requirements  for  approval  of  any  of  our  product  candidates.  These  regulatory  review  agencies  and  committees  and  the  new  requirements  or
guidelines  they  promulgate  may  lengthen  the  regulatory  review  process,  require  us  to  perform  additional  studies  or  trials,  increase  our  development  costs,  lead  to  changes  in
regulatory positions and interpretations, delay or prevent approval and commercialization of our product candidates or lead to significant post-approval limitations or restrictions.

 Patients receiving T cell-based immunotherapies, such as our product candidates, may experience serious adverse events, including neurotoxicity, CRS and killing of
cells other than the intended B cells that express the autoantibodies. If our product candidates are revealed to have high and unacceptable severity and/or prevalence of
side  effects  or  unexpected  characteristics,  their  clinical  development,  regulatory  approval,  and  commercial  potential  will  be  negatively  impacted,  which  will
significantly harm our business, financial condition and prospects.

Our product candidates are CAAR T cell-based immunotherapies. There is a possibility that our product candidates could have adverse side effects, such as neurotoxicity
and CRS. In other similarly designed cellular immunotherapies to treat cancer, there have been life threatening events related to severe neurotoxicity and CRS requiring intense
medical  intervention,  such  as  intubation  or  medications  to  support  blood  pressure,  and  in  several  cases,  resulted  in  death.  Severe  neurotoxicity  is  a  condition  that  is  currently
defined clinically by cerebral edema, confusion, drowsiness, speech impairment, tremors, seizures or other central nervous system side effects, when such side effects are serious
enough to lead to intensive care. CRS is a condition that is currently defined clinically by certain symptoms related to the release of cytokines, which can include fever, chills and
low blood pressure, when such side effects are serious enough to lead to intensive care with mechanical ventilation or significant medications to support blood pressure.

Our product candidates may have serious and potentially fatal targeting of cells within the body due to unexpected protein interactions with the CAAR. Although we have
completed multiple preclinical studies designed to screen for toxicity caused by unintended off-target recognition by the cell binding domain of the DSG3 CAAR, our product
candidates may still recognize and react with one or more proteins unrelated to the intended surface immunoglobin target protein to which it is designed to link. If unexpected
binding occurs in normal tissue, our product candidates may target and kill the normal tissue in a patient, leading to serious and potentially fatal adverse events, undesirable side
effects, toxicities or unexpected characteristics. Detection of any unexpected targeting may halt or delay any ongoing clinical trials for our product candidates and prevent or delay
regulatory approval. While we have developed a preclinical screening process to identify cross-reactivity of our product candidates, we cannot be certain that this process will
identify all potential tissue that our product candidates may target. For example, a membrane protein array with DSG3-CAART yielded one weak signal against a protein that is
designed  to  bind  to  glycoproteins  and  which  was  detected  in  both  the  test  and  control  conditions.  Further  analysis  of  this  protein  in  confirmatory  cell-based  assays  repeatedly
demonstrated that DSG3-CAART does not recognize nor activate against this protein. However, this further analysis may prove to be inaccurate. Any unexpected targeting that
impacts patient safety could materially impact our ability to advance our product candidates into clinical trials or to proceed to marketing approval and commercialization.

Results of our studies could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics. Undesirable side effects caused by our

product candidates could cause us or regulatory

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authorities to interrupt, delay or halt clinical trials and could result in a more restrictive label or the delay or denial of regulatory approval by the FDA. The FDA has requested and
we have agreed to provide data on the subjects dosed in Part A of our  DesCAARTesTM  trial prior to dosing subjects in Part B. The FDA has communicated that the dosing of
patients in Part B1 is not dependent on the review of Part A data and that they will provide feedback, if any, in a timely manner. In some cases, side effects such as neurotoxicity or
CRS  have  resulted  in  clinical  holds  of  ongoing  clinical  trials  and/or  discontinuation  of  the  development  of  the  product  candidate.  Given  that  the  autoimmune  and  alloimmune
diseases  we  are  seeking  to  treat  are,  in  some  cases,  less  serious  than  the  later  stage  cancers  being  treated  with  other  immunotherapy  products,  we  believe  the  FDA  and  other
regulatory authorities likely will apply a different benefit-risk assessment thresholds such that even if our product candidate demonstrated a similar safety profile as current CAR T
therapies, the FDA may ultimately determine that the harmful side effects outweigh the benefits and require us to cease clinical trials or deny approval of our product candidates.
We believe tolerance for adverse events in the patient population being pursued with CAAR T cell therapies will be lower than it is in oncology, and the risks of negative impact
from these toxicities may therefore be higher for us than for CAR T programs in oncology.

Furthermore, treatment-related side effects could also affect patient recruitment or the ability of enrolled patients to complete the studies or result in potential product
liability  claims.  In  addition,  these  side  effects  may  not  be  appropriately  recognized  or  managed  by  the  treating  medical  staff,  as  toxicities  resulting  from  T  cell-based
immunotherapies are not normally encountered in routine medical care. Medical personnel may need additional training regarding T cell-based immunotherapy product candidates
to understand their side effects. Inadequate training in recognizing or failure to effectively manage the potential side effects of T cell-based immunotherapy product candidates
could result in patient deaths. Any of these occurrences may harm our business, financial condition and prospects significantly.

In addition to side effects caused by our product candidates, the preconditioning, administration process or related procedures, which we evaluate from time to time as
part of our process improvement and optimization efforts, may also cause adverse side effects. For example, severe neurotoxicity has been noted to be associated with the use of
certain lymphodepleting regimens. While we believe there are sufficient data from other CAR T programs to suggest that it is reasonable for us to initiate our first clinical trial of
DSG3-CAART without a preconditioning regimen, we cannot be certain that a preconditioning regimen, with or without lymphodepleting agents, will not be required.

 Although we plan to infuse DSG3-CAART without preconditioning initially in our DesCAARTesTM trial, we may in the future use a preconditioning regimen for our
CAAR T cell product candidates, which may increase the risk of adverse side effects and impact our ability to accurately assess the efficacy of our product candidates.

In oncology patients receiving CAR T cell therapy, a lymphodepleting preconditioning regimen is typically used to condition the patient prior to CAR T cell infusion in
order to improve tumor immunogenicity and to promote the expansion of the infused CAR T cells. Together, these effects have been shown to enhance the clinical activity of CAR
T  cells  in  oncology  patients.  These  regimens  often  include  cyclophosphamide  and  fludarabine  and  are  usually  administered  within  the  week  prior  to  infusion  of  CAR  T  cells.
Serious  adverse  events  have  been  observed  in  some  patients  following  CAR  T  cell  infusion,  and  these  include  infection,  cytokine  release  syndrome  and  neurotoxicity.  The
preconditioning regimen may contribute to the occurrence and severity of these adverse events due to its role in inducing lymphopenia, or low levels of lymphocytes in the blood,
and enhanced CAR T cell activity.

Lymphodepleting preconditioning may not be required in all oncology settings for CAR T cell activity. A recent clinical trial in multiple myeloma patients published in
2019  in The  Journal  of  Clinical  Investigation showed  similar  clinical  activity  of  CAR  T  cell  infusions  in  patients  with  or  without  a  lymphodepleting  preconditioning  regimen.
Furthermore, the requirement for lymphodepleting preconditioning for potentiating engineered T cell therapy outside of oncology has not been well established. Specifically, the
effect on tumor immunogenicity is not relevant in settings outside oncology, and therefore the contribution of this aspect to the potential enhancing effect of preconditioning would
not apply.

In addition, a lymphodepleting regimen may eliminate pathogenic B cells targeted by our CAAR T cell product candidates. As a result, any lymphodepleting regimen for

preconditioning that we use may adversely affect our ability to use DSG3 autoantibody titers, a standard clinical assay, to assess the activity of DSG3-CAART. An

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inability  to  use  DSG3  autoantibody  levels  to  demonstrate  the  specific  activity  of  our  CAAR  T  cell  product  candidates  may  require  us  to  rely  on  the subjective  measurement  of
blister formation in patients, which can be a less sensitive and accurate measurement of CAAR T cell activity. This therefore could delay efficient clinical development. As a result
of these factors, including the concern that lymphodepletion may confer a potential increased safety risk to an autoimmune patient population, we believe the inclusion of such a
regimen must be justified by clinical data demonstrating the need for it in the setting of autoimmune patients and is therefore difficult to justify in our first-in-human studies.

We initiated our DesCAARTesTM trial without a preconditioning regimen. If clinical data suggest that a preconditioning regimen is advisable, or if FDA requires that we
employ a preconditioning regimen, we may employ such a regimen. If we ultimately use a preconditioning regimen, with or without lymphodepleting agents, prior to infusing
patients  with  our  CAAR  T  cell  product  candidates,  our  clinical  patients  may  experience  increased  or  more  severe  adverse  effects  specifically  related  to  the  preconditioning
regimen, some of which may result in death. These undesirable side effects, whether associated with the preconditioning regimen alone or in combination with our CAAR T cell
product candidates, could cause delays in patient enrollment in our clinical trials, could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result in
a change to our clinical trial design, a more restrictive label or the delay or denial of regulatory approval by the FDA. Any of the foregoing may increase the duration and expense
of the clinical development of our product candidates or limit market acceptance of such product candidates, if approved, any of which could have a material adverse effect on our
business and financial condition. Even if we do not use a preconditioning regimen, patients may experience adverse effects related to our CAAR T cell product candidates, and our
decision to design our clinical trials without preconditioning does not eliminate the risk of those side effects.

 Our business is highly dependent on the success of our initial product candidates targeting B cell-mediated autoimmune diseases, particularly DSG3-CAART. All of
our  product  candidates  will  require  significant  additional  preclinical  and  clinical  development  before  we  can  seek  regulatory  approval  for  and  launch  a  product
commercially.

Our business and future success depend on our ability to obtain regulatory approval of, and then successfully launch and commercialize our initial product candidates
targeting  B  cell-mediated  autoimmune  diseases,  including  DSG3-CAART,  MuSK-CAART,  DSG3/1-CAART  and  others  that  may  be  selected  from  preclinical  programs.  Our
product  candidates  are  in  the  early  stages  of  development  and  will  require  additional  preclinical  studies,  clinical  trials,  regulatory  review  and  licensure,  substantial  investment,
access to sufficient commercial manufacturing capacity and significant marketing efforts before we can generate any revenue from product sales. There is no guarantee that we will
be  able  to  advance  our  product  candidates  through  clinical  development  or  obtain  marketing  approval  for  any  of  our  product  candidates.  The  process  for  obtaining  marketing
approval for any product candidate is very long and risky and there will be significant challenges for us to address in order to obtain marketing approval as planned, if at all.

Our IND was cleared in September 2019, and we initiated our DesCAARTesTM trial in June 2020. We announced dosing of the first patient in this trial in December
2020. Until dosing of this patient, DSG3-CAART had only been administered in murine models, and the preclinical results we have observed may not be predictive of the results of
our clinical trial or any future clinical trials. Because DSG3-CAART is the first product candidate that we are testing in the clinic, we may experience preliminary complications
surrounding trial design, protocol establishment and execution, establishing trial protocols, patient recruitment and enrollment, quality and supply of clinical doses, or safety issues.
For example, while the majority of oncology CAR T clinical trials have been conducted with a lymphodepleting or other preconditioning regimen prior to infusion, we do not
intend  to  use  pre-infusion  lymphodepletion  or  other  preconditioning  regimen  initially  in  our  Phase  1  trial.  However,  we  may  determine  that  use  of  a  lymphodepleting  or  other
preconditioning regimen is necessary for our product candidates to be successful, which could result in delays in clinical development and will expose patients to the associated
risks.

Additionally, a failure of our clinical trial of DSG3-CAART could influence physicians’ and regulators’ opinions with regard to the viability of our CABA platform more
broadly, particularly if treatment-related side effects are observed. The occurrence of any of these risks could significantly harm our development plans and business prospects. If
treatment-related side effects are observed with the administration of DSG3-CAART, or if it is viewed as less safe, potent or pure than other therapies, our ability to develop other
CAAR T cell therapies may be significantly harmed.

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 We have never successfully completed any clinical trials, and we may be unable to do so for any product candidates we develop.

We have not yet demonstrated our ability to successfully complete any clinical trials, including large-scale, pivotal clinical trials, obtain regulatory 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. Although our
key  employees  have  significant  experience  in  leading  clinical  development  programs,  we  have  no  experience  as  a  company  in  conducting  clinical  trials  beyond  our  current
DesCAARTesTM  trial  initiated  in  June  2020.  Otherwise,  we  currently  have  ongoing  IND-enabling  studies  for  our  MuSK  CAAR  T  program,  with  a  planned  IND  submission
anticipated in the second half of 2021. We may not be able to file such IND or INDs for any of our other product candidates on the timelines we expect, if at all. For example, we
may experience manufacturing delays with IND-enabling studies. Moreover, we cannot be sure that submission of an IND will result in the FDA allowing further clinical trials to
begin, or that, once begun, issues will not arise that require us to suspend or terminate clinical trials. Commencing each of these clinical trials is subject to finalizing the trial design
based on discussions with the FDA and other regulatory authorities. Any guidance we receive from the FDA or other regulatory authorities is subject to change. These regulatory
authorities could change their position, including, on the acceptability of our trial designs or the clinical endpoints selected, which may require us to complete additional clinical
trials or impose stricter approval conditions than we currently expect.

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;

  be subject to post-marketing testing requirements; or

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

 We may not be able to file INDs to commence clinical trials on the timelines we expect, and even if we are able to, the FDA may not permit us to proceed.

We submitted an IND to the FDA to initiate a clinical trial of DSG3-CAART targeting mPV in August 2019, which was cleared by the FDA in September 2019. The
timing  of  submissions  on  future  product  candidates  will  be  dependent  on  further  preclinical  and  manufacturing  success.  We  cannot  be  sure  that  submission  of  an  IND  or  IND
amendment will result in the FDA allowing testing and clinical trials to begin, or that, once begun, issues will not arise that would cause us or the FDA to suspend or terminate such
clinical trials. Additionally, even if such regulatory authorities agree with the design and implementation of the clinical trials set forth in an IND or clinical trial application, we
cannot guarantee that such regulatory authorities will not change their requirements in the future.

Risks Related to the Current Novel Coronavirus (COVID-19) Pandemic

 The COVID-19 pandemic and the future outbreak of other highly infectious or contagious diseases could seriously harm our research, development and potential

future commercialization efforts, increase our costs and expenses and have a material adverse effect on our business, financial condition and results of operations.

Public  health  crises  such  as  pandemics  or  similar  outbreaks  could  adversely  impact  our  business,  the  business  operations  of  third  parties  on  whom  we  rely  and  our
ongoing or planned research and development activities. In December 2019, a novel strain of coronavirus surfaced in Wuhan, China and has since reached multiple other regions
and countries, including Philadelphia, Pennsylvania where our primary office and laboratory space, as well as certain of our CMO partners, are located. The COVID-19 pandemic
is evolving, and to date has led to the implementation of various responses, including government-imposed quarantines, travel restrictions and other public

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health safety measures. The extent to which COVID-19 impacts our operations or those of our third party partners will depend on future developments, which are highly uncertain
and  cannot  be  predicted  with  confidence,  including  the  duration  of  the  pandemic,  new  information  that  may  emerge  concerning  the  severity of  COVID-19,  the  impact  of  new
strains of the virus, the effectiveness and availability of vaccines and the actions to contain COVID-19 or treat its impact, among others.

Additionally, timely enrollment in our ongoing and planned clinical trials is dependent upon clinical trial sites which will be adversely affected by global health matters,
such as COVID-19. We plan to conduct clinical trials for our product candidates in geographies which are currently being affected by COVID-19. Some factors from the COVID-
19 pandemic that have delayed and could further delay or otherwise adversely affect enrollment in the clinical trials of our product candidates, as well as our business generally,
include:

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the potential diversion of healthcare resources away from the conduct of clinical trials to focus on pandemic concerns, including the attention of physicians
serving as our clinical trial investigators, hospitals serving as our clinical trial sites and hospital staff supporting the conduct of our prospective clinical trials;

limitations on travel that could interrupt key trial and business activities, such as clinical trial site initiations and monitoring, domestic and international travel
by employees, contractors or patients to clinical trial sites, including any government-imposed travel restrictions or quarantines that will impact the ability or
willingness of patients, employees or contractors to travel to our clinical trial sites or secure visas or entry permissions, a loss of face-to-face meetings and
other interactions with potential partners, any of which could delay or adversely impact the conduct or progress of our prospective clinical trials;

interruption in global shipping affecting the transport of clinical trial materials, such as patient samples, investigational drug product and conditioning drugs
and other supplies used in our prospective clinical trials;

interruptions in operations at our third-party manufacturers, which could result in delays or disruptions in the supply of our current product candidates and any
future product candidates; and

business disruptions caused by potential workplace, laboratory and office closures and an increased reliance on employees working from home, disruptions to
or  delays  in  ongoing  laboratory  experiments  and  operations,  product  manufacturing  and  supply,  staffing  shortages,  travel  limitations  or  mass  transit
disruptions, any of which could adversely impact our business operations or delay necessary interactions with local regulators, ethics committees and other
important agencies and contractors.

These and other factors arising from the coronavirus could continue to worsen. Any of these factors, and other factors related to any such disruptions that are unforeseen,
could have a material adverse effect on our business and our results of operation and financial condition. Further, uncertainty around these and related issues could lead to adverse
effects on the economy of the United States and other economies, which could impact our ability to raise the necessary capital needed to develop and commercialize our product
candidates.

Risks Related to the Industry

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

Undesirable or unacceptable side effects caused by our product candidates could cause us or regulatory authorities to interrupt, delay or halt clinical trials and could result
in a more restrictive label or the delay or denial of regulatory approval by the FDA. Further, clinical trials by their nature utilize a sample of the potential patient population. With a
limited number of subjects and limited duration of exposure, rare and severe side effects of our product candidates may only be uncovered with a significantly larger number of
patients exposed to the drug. Undesirable side effects could also result in an expansion in the size of our clinical trials, increasing the expected costs and timeline of our clinical
trials. Additionally, results of our clinical trials could reveal a high and unacceptable severity and prevalence of side effects or unexpected characteristics.

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Licensed  CAR  T  cell  therapies  and  those  under  development  have  shown  frequent  rates  of  CRS  and  neurotoxicity,  and  adverse  events  have  resulted  in  the  death  of
patients. Similar adverse events could occur during treatment with our CAAR T cell product candidates. For example, activation of CAAR T cells by patient autoantibodies or
alloantibodies could stimulate CRS. When CAAR T cells are infused and the CAAR binds to soluble antibodies in the blood or tissues of treated patients, these soluble antibodies
may cause the CAAR T cells to proliferate, resulting in an activation of the immune system that is too high, leading to CRS. Further, it is possible that patients will exhibit acute
rejection of the CAAR T cells because of preexisting immunity to the antigen within the CAAR. This could render our product candidates ineffective.

If unacceptable toxicities or health risks, including risks inferred from other unrelated immunotherapy trials, arise in the development of our product candidates, we could
suspend or terminate our trials or the FDA, the Data Safety Monitoring Board, or DSMB, or local regulatory authorities such as institutional review boards, or IRBs, could order us
to cease clinical trials. Regulatory authorities, such as the FDA, could also deny approval of our product candidates for any or all targeted indications. Treatment-related side effects
could also affect patient recruitment or the ability of enrolled subjects to complete the trial or result in potential product liability claims. In addition, these side effects may not be
appropriately recognized or managed by the treating medical staff, as toxicities resulting from T cell therapy are not normally encountered in the general patient population and by
medical personnel. We expect to have to train medical personnel using CAAR T cell product candidates to understand the side effect profile of our product candidates for both our
preclinical studies and clinical trials and upon any commercialization of any of our product candidates, if licensed. Inadequate training in recognizing or managing the potential
side effects of our product candidates could result in patient deaths. Any of these occurrences may harm our business, financial condition and prospects significantly.

 Our  preclinical  studies  and  clinical  trials  may  fail  to  demonstrate  the  safety,  potency  and  purity  of  any  of  our  product  candidates,  which  would  prevent  or  delay
regulatory approval and commercialization.

Before obtaining regulatory approvals for the commercial sale of any of our product candidates, we must demonstrate through lengthy, complex and expensive preclinical
testing and clinical trials that our product candidates are safe, potent and pure for use in each target indication. Clinical trials are expensive and can take many years to complete,
and their outcomes are inherently uncertain. Failure can occur at any time during the clinical trial process. The results of preclinical studies and early clinical trials of our product
candidates  may  not  be  predictive  of  the  results  of  later-stage  clinical  trials,  including  in  any  post-approval  studies  of  our  product  candidates.  In  addition,  initial  success  in  any
clinical trials may not be indicative of results obtained when such trials are completed. There is typically an extremely high rate of attrition from the failure of product candidates
proceeding  through  clinical  trials.  Product  candidates  in  later  stages  of  clinical  trials  may  fail  to  show  the  desired  safety,  potency  and  purity  profile  despite  having  progressed
through preclinical studies and initial clinical trials.

A number of companies in the biopharmaceutical industry have suffered significant setbacks in advanced clinical trials due to lack of potency or efficacy, insufficient
durability of potency or efficacy or unacceptable safety issues, notwithstanding promising results in earlier trials, and we cannot be certain that we will not face similar setbacks.
These setbacks have been caused by, among other things, preclinical and other nonclinical findings made while clinical trials were underway, or safety or efficacy observations
made in preclinical studies and clinical trials, including previously unreported adverse events. Moreover, preclinical and clinical data are often susceptible to varying interpretations
and analyses and many companies that believed their product candidates performed satisfactorily in preclinical studies and clinical trials nonetheless failed to obtain FDA or EMA
approval. Most product candidates that commence clinical trials are never approved as products.

Any preclinical studies or clinical trials that we may conduct may not demonstrate the safety, potency and purity necessary to obtain regulatory approval to market our
product  candidates.  If  the  results  of  our  ongoing  or  future  preclinical  studies  and  clinical  trials  are  inconclusive  with  respect  to  the  safety,  potency  and  purity  of  our  product
candidates, if we do not meet the clinical endpoints with statistical and clinically meaningful significance, or if there are safety concerns associated with our product candidates, we
may be prevented or delayed in obtaining marketing approval for such product candidates. In some instances, there can be significant variability in safety, potency or purity results
between  different  preclinical  studies  and  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 clinical trial protocols and the rate of dropout among clinical trial participants. For
example, because our CAAR T cell product candidates only target approximately 0.01% to 1% of the B cells in a patient, they may not engage enough of the target to achieve
adequate engraftment necessary for elimination of all pathogenic B cells. Insufficient safety or potency in clinical trials may delay product development to enable time to modify the
product candidate for next generation approaches or make manufacturing changes or may lead us to discontinue development of the product candidate.

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Additionally, our ongoing DesCAARTes™ trial utilizes, and our planned trials may utilize, an “open-label” trial design. An “open-label” clinical trial is one where both
the patient and investigator know whether the patient is receiving the investigational product candidate or either an active drug or placebo. Most typically, open-label clinical trials
test only the investigational product candidate and sometimes may do so at different dose levels. Open-label clinical trials are subject to various limitations that may exaggerate
any  therapeutic  effect  as  patients  in  open-label  clinical  trials  are  aware  when  they  are  receiving  treatment.  Open-label  clinical  trials  may  be  subject  to  a  “patient  bias”  where
patients perceive their symptoms to have improved merely due to their awareness of receiving an experimental treatment. In addition, open-label clinical trials may be subject to an
“investigator bias” where those assessing and reviewing the physiological outcomes of the clinical trials are aware of which patients have received treatment and may interpret the
information of the treated group more favorably given this knowledge. The results from an open-label trial may not be predictive of future clinical trial results with any of our
product candidates for which we include an open-label clinical trial when studied in a controlled environment with a placebo or active control.

In addition, for DSG3-CAART, MuSK-CAART and any future trials that may be completed, we cannot guarantee that the FDA will interpret the results as we do, and
more trials could be required before we submit our product candidates for approval. To the extent that the results of the trials are not satisfactory to the FDA to support a marketing
application, approval of our product candidates may be significantly delayed, or we may be required to expend significant additional resources, which may not be available to us,
to conduct additional trials in support of potential approval of our product candidates.

 Interim, topline or preliminary data from any preclinical studies or clinical trials that we conduct may change as more data become available and are subject to audit
and verification procedures that could result in material changes in the final data.

Our initial clinical trial for our lead product candidate will be open-label. From time to time, we may publicly disclose preliminary or topline or data from our preclinical
studies and clinical trials, which will be based on a preliminary analysis of then-available data, and the results and related findings and conclusions are subject to change following
a more comprehensive review of the data related to the particular study or trial. We also make assumptions, estimations, calculations and conclusions as part of our analyses of
data,  and  we  may  not  have  received  or  had  the  opportunity  to  fully  and  carefully  evaluate  all  data. Additionally,  in  our  DesCAARTes TM  trial,  the  product  candidate  will  be
administered by intravenous infusion, using a fractionated-dose infusion scheme of escalating numbers of DSG3-CAART cells.

As a result, the topline results that we report may differ from future results of the same studies, or different conclusions or considerations may qualify such results, once
additional  data  have  been  received  and  fully  evaluated.  Topline  data  also  remain  subject  to  audit  and  verification  procedures  that  may  result  in  the  final  data  being  materially
different from the preliminary data we previously published. As a result, topline data should be viewed with caution until the final data are available. From time to time, we may
also disclose interim data from planned interim analyses in our clinical trials. Interim data from clinical trials that we may complete are subject to the risk that one or more of the
clinical outcomes may materially change as patient enrollment continues and more patient data become available. Adverse differences between preliminary or interim data and
final data could significantly harm our business prospects. Further, disclosure of interim data by us or by our competitors could result in volatility in the price of our common
stock.

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Regulatory agencies, including the FDA, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may interpret or weigh the
importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the particular product candidate or product and
our company in general.

If the interim, topline or preliminary data that we report differ from actual results, or if others, including regulatory authorities, disagree with the conclusions reached, our

ability to obtain approval for, and commercialize, our product candidates may be harmed, which could harm our business, operating results, prospects or financial condition.

 We may encounter substantial delays in our clinical trials or may not be able to conduct our trials on the timelines we expect or at all.

Clinical  testing  is  expensive,  time  consuming  and  subject  to  uncertainty.  We  cannot  guarantee  that  any  clinical  trials  will  be  conducted  as  planned  or  completed  on
schedule, if at all. Even if these trials begin as planned, issues may arise that could suspend or terminate such clinical trials. A failure of one or more clinical trials can occur at any
stage of testing, and our ongoing and future clinical trials may not be successful. Events that may prevent successful or timely completion of clinical development include:

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inability to generate sufficient preclinical, toxicology or other in vivo or in vitro data to support the initiation of clinical trials;

delays in sufficiently developing, characterizing or controlling a manufacturing process suitable for clinical trials;

delays in developing suitable assays for screening patients for eligibility for clinical trials with respect to certain product candidates;

delays in reaching a consensus with the FDA and other regulatory agencies on trial design;

delays in reaching agreement on acceptable terms with prospective CROs and clinical study sites, the terms of which can be subject to extensive negotiation
and may vary significantly among different CROs and clinical trial sites;

delays in obtaining required institutional review board, or IRB, approval at each clinical trial site;

imposition  of  a  temporary  or  permanent  clinical  hold  by  regulatory  agencies  for  a  number  of  reasons,  including  after  review  of  an  IND  submission  or
amendment, or equivalent application or amendment; as a result of a new safety finding that presents unreasonable risk to clinical trial participants; a negative
finding from an inspection of our clinical study operations or study sites; developments on trials conducted by competitors for related technology that raises
FDA concerns about risk to patients of the technology broadly; or if FDA finds that the investigational protocol or plan is clearly deficient to meet its stated
objectives;

delays in recruiting eligible patients to participate in our clinical trials;

delays in treating one or more patients, once enrolled, due to a patient’s inability to accommodate parts of the complex study procedures schedule;

difficulty collaborating with patient groups and investigators;

failure by our CROs, other third parties or us to adhere to clinical trial requirements;

limitations on our recourse in our CRO relationship with Penn as compared to a CRO that is not an academic institution;

failure to perform in accordance with the FDA’s good clinical practice, or GCP, requirements or applicable regulatory guidelines in other countries;

transfer  of  manufacturing  processes  to  any  new  CMO  or  our  own  manufacturing  facilities  or  any  other  development  or  commercialization  partner  for  the
manufacture of product candidates;

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delays in having patients complete participation in a trial or return for post-treatment follow-up;

patients dropping out of a trial;

occurrence of adverse events associated with the product candidate that are viewed to outweigh its potential benefits;

changes in regulatory requirements and guidance that require amending or submitting new clinical protocols;

changes in the standard of care on which a clinical development plan was based, which may require new or additional trials;

the cost of clinical trials of our product candidates being greater than we anticipate;

clinical trials of our product candidates producing negative or inconclusive results, which may result in our deciding, or regulators requiring us, to conduct
additional clinical trials or abandon product development programs;

delays or failure to secure supply agreements with suitable raw material suppliers, or any failures by suppliers to meet our quantity or quality requirements for
necessary raw materials; and

delays in manufacturing, testing, releasing, validating or importing/exporting sufficient stable quantities of our product candidates for use in clinical trials or
the inability to do any of the foregoing.

Any inability to successfully complete preclinical and clinical development could result in additional costs to us or impair our ability to generate revenue. In addition, if
we make manufacturing or formulation changes to our product candidates, we may be required to, or we may elect to, conduct additional trials to bridge our modified product
candidates to earlier versions. Clinical trial delays could also shorten any periods during which our product candidates and products, if licensed, have patent protection and may
allow our competitors to bring products to market before we do, which could impair our ability to successfully commercialize our product candidates and may harm our business
and results of operations.

We could also encounter delays if a clinical trial is suspended or terminated by us, by the DSMB for such trial or by the FDA or other regulatory authority, or if the IRBs
of the institutions in which such trials are being conducted suspend or terminate the participation of their clinical investigators and sites subject to their review. Such authorities
may  suspend  or  terminate  a  clinical  trial  due  to  a  number  of  factors,  including  failure  to  conduct  the  clinical  trial  in  accordance  with  regulatory  requirements  or  our  clinical
protocols, inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or
adverse side effects, failure to demonstrate a benefit from using a product candidate, changes in governmental regulations or administrative actions or lack of adequate funding to
continue the clinical trial.

Delays in the initiation, conduct or completion of any clinical trial of our product candidates will increase our costs, slow down our product candidate development and
approval process and delay or potentially jeopardize our ability to commence product sales and generate revenue. In addition, many of the factors that cause, or lead to, a delay in
the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval of our product candidates. In the event we identify any additional
product  candidates  to  pursue,  we  cannot  be  sure  that  submission  of  an  IND  will  result  in  the  FDA  allowing  clinical  trials  to  begin  in  a  timely  manner,  if  at  all. Any  of  these
occurrences may significantly harm our business, financial condition and prospects.

  Monitoring  safety  of  patients  receiving  our  product  candidates  will  be  challenging,  which  could  adversely  affect  our  ability  to  obtain  regulatory  approval  and
commercialize our product candidates.

For our clinical trials of DSG3-CAART and our other product candidates, we expect to continue to contract with Penn and other academic medical centers and hospitals
experienced in the assessment and management of toxicities arising during clinical trials. In the future, we may also contract with non-academic medical centers and hospitals with
similar capabilities. Nonetheless, these centers and hospitals may have difficulty observing patients, including due to failure by patients to comply with post-clinical trial follow-up
programs, and treating toxicities,

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which may be more challenging due to personnel changes, inexperience, shift changes, house staff coverage or related issues. This could lead to more severe or prolonged toxicities
or even patient deaths, which could result in us or the FDA delaying, suspending or terminating one or more of our clinical trials, and which could jeopardize regulatory approval.
We also expect the centers using DSG3-CAART and our other product candidates, if licensed, on a commercial basis could have similar difficulty in managing adverse events.
Medicines used at centers to help manage adverse side effects of DSG3-CAART and our other product candidates may not adequately control the side effects and/or may have a
detrimental impact on the efficacy of the treatment.

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

We  may  experience  difficulties  in  patient  enrollment  in  our  clinical  trials  for  a  variety  of  reasons.  The  timely  completion  of  clinical  trials  in  accordance  with  their
protocols depends, among other things, on our ability to enroll a sufficient number of patients who remain in the trial until its conclusion. The enrollment of patients depends on
many factors, including:

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the size and nature of the patient population;

the patient eligibility criteria defined in the protocol;

the size of the patient population required for analysis of the trial’s primary endpoints;

recruiting an adequate number of suitable patients to participate in a clinical trial;

reaching agreement on acceptable terms with prospective CROs and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary
significantly among different CROs and clinical trial sites;

obtaining IRB and other required reviewing body approval at each clinical trial site;

the proximity of patients to trial sites;

the design of the trial and whether the FDA agrees to the design and implementation of the trial;

our ability to identify clinical trial sites and recruit clinical trial investigators with the appropriate capabilities, competencies and experience;

clinicians’  and  patients’  perceptions  as  to  the  potential  advantages  and  risks  of  the  product  candidate  being  studied  in  relation  to  other  available  therapies,
including any new drugs that may be approved for the indications we are investigating;

the occurrence of dose-limiting toxicity in the clinical trial;

the efforts to facilitate timely enrollment in clinical trials;

the patient referral practices of physicians;

the ability to monitor patients adequately during and after treatment;

our ability to obtain and maintain patient consents;

the risk that patients enrolled in clinical trials will drop out of the trials before the infusion of our product candidates or trial completion; and

the ability of patients to meet the complex follow-up requirements of the clinical trial.

In  addition,  our  clinical  trials  will  compete  with  other  clinical  trials  for  product  candidates  that  are  in  the  same  therapeutic  areas  as  our  product  candidates,  and  this
competition will reduce the number and types of patients available to us because some patients who might have opted to enroll in our trials may instead opt to enroll in a trial being
conducted by one of our competitors. Since the number of qualified clinical investigators is limited, some of our clinical trial sites may also be used by some of our competitors,
which may reduce the number of patients who are available for our clinical trials in that clinical trial site.

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Moreover, because our product candidates represent a departure from more commonly used methods for B cell-mediated autoimmune disease treatment, potential patients
and their doctors may be inclined to use conventional therapies, such as corticosteroids or systemic immunosuppressive medications, rather than enroll patients in our clinical trial.

Delays in patient enrollment may result in increased costs or may affect the timing or outcome of our ongoing and planned clinical trials, which could prevent completion

of these trials and adversely affect our ability to advance the development of our product candidates.

Our DesCAARTesTM trial and additional expected Phase 1 clinical trials for each of our product candidates will be pilot dose escalation studies with a limited number of
patients. The activity and toxicity data from these clinical trials of our product candidates may differ from future results of Phase 2 and/or Phase 3 clinical trials that enroll a larger
number of patients.

Since the number of patients that we plan to dose in our DesCAARTesTM trial is small, the results from such clinical trial, once completed, may be less reliable than
results achieved in larger clinical trials, which may hinder our efforts to obtain regulatory approval for our product candidates. In our DesCAARTesTM trial, we plan to evaluate the
toxicity profile of DSG3-CAART and establish the recommended dose for the next clinical trial. The preliminary results of clinical trials with smaller sample sizes, such as our
DesCAARTesTM trial, can be disproportionately influenced by various biases associated with the conduct of small clinical trials, such as the potential failure of the smaller sample
size to accurately depict the features of the broader patient population, which limits the ability to generalize the results across a broader community, thus making the clinical trial
results less reliable than clinical trials with a larger number of patients. As a result, there may be less certainty that such product candidates would achieve a statistically significant
effect in any future clinical trials. If we conduct any future clinical trials of DSG3-CAART, we may not achieve a statistically significant result or the same level of statistical
significance, if any, that we might have anticipated based on the results observed in our DesCAARTesTM trial.

Risks Related to Sales, Marketing and Competition

 The market opportunities for our product candidates may be limited to those patients who are ineligible for or have failed prior treatments and may be small.

Our projections of both the number of people who have the B cell-mediated autoimmune diseases we are targeting, as well as the subset of people with these diseases in a
position to receive second or later lines of therapy and who have the potential to benefit from treatment with our product candidates, are based on our beliefs and estimates. These
estimates have been derived from a variety of sources, including scientific literature, surveys of clinics, patient foundations, or market research and may prove to be incorrect.
Further,  new  studies  may  change  the  estimated  incidence  or  prevalence  of  these  B  cell-mediated  autoimmune  diseases.  The  number  of  patients  may  turn  out  to  be  lower  than
expected. Additionally, the potentially addressable patient population for our product candidates may be limited or may not be amenable to treatment with our product candidates.
For instance, we expect our lead product candidate, DSG3-CAART, to initially target a small patient population that suffers from mPV. Even if we obtain significant market share
for our product candidates, because the potential target populations are small, we may never achieve profitability without obtaining regulatory approval for additional indications.

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

The biopharmaceutical and pharmaceutical industries are characterized by rapidly advancing technologies, intense competition and a strong focus on intellectual property.
We face competition from many different players, including large and specialty pharmaceutical and biotechnology companies, academic research organizations and governmental
agencies.  Any  therapeutic  candidates  we  successfully  develop  and  commercialize  will  compete  with  the  existing  standard  of  care  as  well  as  novel  therapies  that  may  gain
regulatory approval in the future. Many of our competitors have substantially greater financial, technical and other resources, such as larger research and development staff and
experienced  marketing  and  manufacturing  organizations  and  well-established  sales  forces.  Smaller  or  early-stage  companies  may  also  prove  to  be  significant  competitors,
particularly through collaborative arrangements with large, established companies. Mergers and acquisitions in the biotechnology and pharmaceutical

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industries may result in even more resources being concentrated in our competitors. We believe we are the first and only company developing CAAR T drug candidates for the
treatment  of  B  cell-mediated  autoimmune  diseases.  However,  despite  the  significant  differences  in  discovery,  development  and  target  populations  between  oncology  and
autoimmune targets, we recognize that companies with an investment and expertise in CAR T cell development for oncology indications could attempt to leverage their expertise
into B cell-mediated autoimmune disease affected populations. Competition may increase further as a result of advances in the commercial applicability of technologies and greater
availability  of  capital  for  investment  in  these  industries.  Our  competitors,  either  alone  or  with  collaborative  partners,  may  succeed  in  developing,  acquiring  or  licensing  on  an
exclusive  basis  drug  or  biologic  products  that  are  more  effective,  safer,  more  easily  commercialized  or  less  costly  than  our  product  candidates  or  may  develop  proprietary
technologies or secure patent protection that we may need for the development of our technologies and products.

Specifically, while rituximab is the first drug for the treatment of PV, the target indication of our lead product candidate, DSG3-CAART, to have received regulatory
approval  in  the  United  States  in  over  60  years,  we  are  aware  that  multiple  biopharmaceutical  companies  have  therapies  in  clinical  development.  We  are  also  aware  of  other
biopharmaceutical companies developing therapies for muscle-specific kinase myasthenia gravis, or MuSK MG, and Hemophilia A patients who develop alloantibodies against
FVIII. While we do not expect these product candidates to be directly competitive to our product candidates, even if we obtain regulatory approval of our product candidates, the
availability and price of these other products could limit the demand and the price we are able to charge for our product candidates. We may not be able to implement our business
plan  if  the  acceptance  of  our  product  candidates  is  inhibited  by  price  competition  or  the  reluctance  of  physicians  to  switch  from  existing  methods  of  treatment  to  our  product
candidates, or if physicians switch to other new drug or biologic products or choose to reserve our product candidates for use in limited circumstances.

 Even if we obtain regulatory approval of our product candidates, the products may not gain the market acceptance among physicians, patients, hospitals, treatment
centers and others in the medical community necessary for commercial success.

The  use  of  engineered  T  cells  as  a  potential  treatment  for  B  cell-mediated  autoimmune  diseases  is  a  recent  development  and  may  not  become  broadly  accepted  by
physicians, patients, hospitals, treatment centers and others in the medical community. We expect physicians to be particularly influential and we may not be able to convince them
to use our product candidates for many reasons. Additional factors will influence whether our product candidates are accepted in the market, including:

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the clinical indications for which our product candidates are licensed;

physicians, hospitals, treatment centers and patients considering our product candidates as a safe and effective treatment;

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

the prevalence and severity of any side effects;

product labeling or product insert requirements of the FDA or other regulatory authorities;

limitations or warnings contained in the labeling approved by the FDA;

the timing of market introduction of our product candidates as well as competitive products;

the cost of treatment in relation to alternative treatments;

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

the willingness of patients to pay out-of-pocket in the absence of coverage and adequate reimbursement by third-party payors and government authorities;

relative convenience and ease of administration, including as compared to alternative treatments and competitive therapies; and

the effectiveness of our sales and marketing efforts.

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The product candidates we plan to develop and commercialize are premised on offering a potential cure for B cell-mediated autoimmune diseases, which may result in a
high degree of uncertainty related to pricing and long-term demand for our product. Our target patient populations are relatively small. Because of this pricing and demand for our
product  candidates,  if  licensed,  may  not  be  adequate  to  support  an  extended  period  of  commercial  viability,  which  could  adversely  affect  our  continued  ability  to  successfully
produce and market our product or any follow-on products.

In addition, if our product candidates are licensed but fail to achieve market acceptance among physicians, patients, hospitals, treatment centers or others in the medical
community, we will not be able to generate significant revenue. Even if our products achieve market acceptance, we may not be able to maintain that market acceptance over time
if new products or technologies are introduced that are more favorably received than our products, are more cost effective or render our products obsolete.

 Risks Related to Business Development

 We may not be successful in our efforts to identify additional product candidates. Due to our limited resources and access to capital, we must prioritize development of
certain product candidates, which may prove to be wrong and may adversely affect our business.

Although we intend to explore other therapeutic opportunities, in addition to the product candidates that we are currently developing, we may fail to identify viable new

product candidates for clinical development for a number of reasons. If we fail to identify additional potential product candidates, our business could be materially harmed.

Research programs to pursue the development of our existing and planned product candidates for additional indications and to identify new product candidates and disease
targets require substantial technical, financial and human resources whether or not they are ultimately successful. Our research programs may initially show promise in identifying
potential indications and/or product candidates, yet fail to yield results for clinical development for a number of reasons, including:

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the research methodology used may not be successful in identifying potential indications and/or product candidates;

potential product candidates may be identified but may not be able to be expressed on T cells in a manner that enables product activity;

potential product candidates may, after further study, be shown to have harmful adverse effects or other characteristics that indicate they are unlikely to be
effective drugs; or

it may take greater human and financial resources than we will possess to identify additional therapeutic opportunities for our product candidates or to develop
suitable potential product candidates through internal research programs, thereby limiting our ability to develop, diversify and expand our product portfolio.

Because we have limited financial and human resources, we intend to initially focus on research programs and product candidates for a limited set of indications. 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 or a greater
likelihood of success. Our resource allocation decisions may cause us to fail to capitalize on viable commercial products or profitable market opportunities.

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Accordingly, there can be no assurance that we will ever be able to identify additional therapeutic opportunities for our product candidates or to develop suitable potential
product  candidates  through  internal  research  programs,  which  could  materially  adversely  affect  our  future  growth  and  prospects.  We  may  focus  our  efforts  and  resources  on
potential product candidates or other potential programs that ultimately prove to be unsuccessful.

 If we fail to develop additional product candidates, our commercial opportunity will be limited.

One  of  our  core  strategies  is  to  pursue  clinical  development  of  additional  product  candidates  beyond  DSG3-CAART,  MuSK-CAART,  DSG3/1-CAART  and  FVIII-
CAART. Developing, obtaining regulatory approval and commercializing additional CAAR T cell product candidates will require substantial additional funding and is prone to the
risks  of  failure  inherent  in  medical  product  development.  We  cannot  provide  you  any  assurance  that  we  will  be  able  to  successfully  advance  any  of  these  additional  product
candidates through the development process.

Even if we receive FDA approval to market additional product candidates for the treatment of B cell-mediated autoimmune diseases, we cannot assure you that any such
product candidates will be successfully commercialized, widely accepted in the marketplace or more effective than other commercially available alternatives. If we are unable to
successfully  develop  and  commercialize  additional  product  candidates,  our  commercial  opportunity  will  be  limited.  Moreover,  a  failure  in  obtaining  regulatory  approval  of
additional product candidates may have a negative effect on the approval process of any other, or result in losing approval of any approved, product candidate.

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

Our ability to compete in the highly competitive biotechnology and pharmaceutical industries depends upon our ability to attract and retain highly qualified managerial,
scientific  and  medical  personnel.  We  are  highly  dependent  on  our  management,  scientific,  and  medical  personnel,  including  our  Chief  Executive  Officer  and  President,  our
Scientific Advisory Board members, our Chief Medical Officer, our Executive Vice President, Science and Technology, and our Chief Financial Officer. The loss of the services
of any of our executive officers, other key employees, and other scientific and medical advisors, and our inability to find suitable replacements could result in delays in product
development and harm our business.

Competition for skilled personnel in our market is intense and may limit our ability to hire and retain highly qualified personnel on acceptable terms or at all. To induce
valuable  employees  to  remain  at  our  company,  in  addition  to  salary  and  cash  incentives,  we  have  provided  stock  options  that  vest  over  time.  The  value  to  employees  of  stock
options  that  vest  over  time  may  be  significantly  affected  by  movements  in  our  stock  price  that  are  beyond  our  control  and  may  at  any  time  be  insufficient  to  counteract  more
lucrative  offers  from  other  companies.  Despite  our  efforts  to  retain  valuable  employees,  members  of  our  management,  scientific  and  development  teams  may  terminate  their
employment with us on short notice. Although we have employment agreements with our key employees, these employment agreements provide for at-will employment, which
means  that  any  of  our  employees  could  leave  our  employment  at  any  time,  with  or  without  notice.  We  do  not  maintain  “key  person”  insurance  policies  on  the  lives  of  these
individuals or the lives of any of our other employees. Our success also depends on our ability to continue to attract, retain and motivate highly skilled junior, mid-level and senior
managers as well as junior, mid-level and senior scientific and medical personnel.

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 We expect to grow the size of our organization, and we may experience difficulties in managing this growth.

As of December 31, 2020, we had 33 full-time employees and one part-time employee. As our development and commercialization plans and strategies develop, and as
we continue to transition into operating as a public company, we expect to rapidly expand our employee base and continue to  add  managerial,  operational,  sales,  research  and
development, marketing, financial and other personnel. For example, we are still dependent on Penn and certain Penn-affiliated entities to continue providing certain research and
development as well as manufacturing services under that certain research services agreement. Current and future growth imposes significant added responsibilities on members of
management, including:

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identifying, recruiting, integrating, maintaining and motivating additional employees;

managing our internal development efforts effectively, including the clinical and FDA review process for our product candidates, while complying with our
contractual obligations to contractors and other third parties; and

improving our operational, financial and management controls, reporting systems and procedures.

Our future financial performance and our ability to commercialize our product candidates will depend, in part, on our ability to effectively manage our growth, and our
management may also have to divert a disproportionate amount of its attention away from day-to-day activities in order to devote a substantial amount of time to managing these
growth activities.

We currently rely, and for the foreseeable future will continue to rely, in substantial part on certain independent organizations, advisors and consultants to provide certain
services, including certain research and development as well as general and administrative support, pursuant to agreements which expire after a certain period of time. There can be
no assurance that the services of independent organizations, advisors and consultants will continue to be available to us on a timely basis when needed, or that we can find qualified
replacements. In addition, if we are unable to effectively manage our outsourced activities or if the quality or accuracy of the services provided by consultants is compromised for
any reason, our clinical trials may be extended, delayed or terminated, and we may not be able to obtain regulatory approval of our product candidates or otherwise advance our
business. There can be no assurance that we will be able to manage our existing consultants or find other competent outside contractors and consultants on economically reasonable
terms, or at all.

If we are not able to effectively expand our organization by hiring new employees and expanding our groups of consultants and contractors, or if we are not able to raise
sufficient funds in the future to support our hiring efforts beyond our research and development personnel, we may not be able to successfully implement the tasks necessary to
further develop and commercialize our product candidates and, accordingly, may not achieve our research, development and commercialization goals.

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

Our  operations,  Penn’s  operations  and  those  of  any  CMOs,  CROs  and  other  contractors  and  consultants  that  we  may  engage  could  be  subject  to  earthquakes,  power
shortages,  telecommunications  failures,  water  shortages,  floods,  hurricanes,  typhoons,  fires,  extreme  weather  conditions,  medical  epidemics  and  other  natural  or  man-made
disasters  or  business  interruptions,  for  which  we  are  predominantly  self-insured.  The  occurrence  of  any  of  these  business  disruptions  could  seriously  harm  our  operations  and
financial condition and increase our costs and expenses. We currently rely on Penn to produce and process our first product candidate and anticipate that in the future we will rely
on a third-party CMO for the same. Our ability to obtain clinical supplies of our product candidates could be disrupted if the operations of these suppliers are affected by a man-
made or natural disaster or other business interruption.

In addition, due to the COVID-19 pandemic, our increased reliance on personnel working from home may negatively impact productivity, or disrupt, delay, or otherwise
adversely impact our business operations. Further, this could increase our cyber security risk, create data accessibility concerns, and make us more susceptible to communication
disruptions, any of which could adversely impact our business operations or delay necessary

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interactions with local and federal regulators, ethics committees, manufacturing sites, research or clinical trial sites and other important agencies and contractors.

Risks Related to Litigation

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

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

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inability to bring our product candidates to the market;

decreased demand for our product candidates;

injury to our reputation;

withdrawal of clinical trial participants;

initiation of investigations by regulators;

costs to defend the related litigation;

a diversion of management’s time and our resources;

substantial monetary awards to trial participants or patients;

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

loss of revenue;

exhaustion of any available insurance and our capital resources;

the inability to commercialize any product candidate; and

a decline in our share price.

Since  we  have  not  yet  commenced  marketing  of  any  products,  we  do  not  yet  hold  product  liability  insurance  for  commercialization  of  our  product  candidates.  Our
inability to obtain sufficient product liability insurance at an acceptable cost to protect against potential product liability claims could prevent or inhibit the commercialization of
products we develop, alone or with corporate collaborators. Our insurance policies may also have various exclusions, and we may be subject to a product liability claim for which
we have no coverage. Assuming we obtained clinical trial insurance for our clinical trials, we may have to pay amounts awarded by a court or negotiated in a settlement that exceed
our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient capital to pay such amounts. Even if our agreements with
any future corporate collaborators entitle us to indemnification against losses, such indemnification may not be available or adequate should any claim arise.

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Risks Related to Our Financial Condition and Capital Requirements

Risks Related to Past Financial Condition

We  have  incurred  net  losses  in  every  period  since  our  inception  and  anticipate  that  we  will  incur  substantial  net  losses  over  the  next  several  years,  and  may  never
achieve or maintain profitability.

Investment  in  biopharmaceutical  product  development  is  highly  speculative  because  it  entails  substantial  upfront  capital  expenditures  and  significant  risk  that  any
potential  product  candidate  will  fail  to  demonstrate  adequate  effect  or  an  acceptable  safety  profile,  gain  regulatory  approval  and  become  commercially  viable.  We  have  only
recently licensed rights to the patents underlying our product candidates and initiated our DesCAARTes TM trial in June 2020. We have no products licensed for commercial sale,
and we will continue to incur significant research and development and other expenses related to our ongoing operations. Our net losses may fluctuate significantly from quarter to
quarter and year to year. We have to date financed our operations primarily through private placements of our preferred stock.

As a result, we are not profitable and have incurred net losses in each period since our inception. For the years ended December 31, 2020 and 2019, we recorded net losses
of  $33.3  million  and  $16.9  million,  respectively. As  of  December  31,  2020,  we  had  an  accumulated  deficit  of  $66.3  million.  We  expect  to  incur  significant  losses  for  the
foreseeable future, and we expect these losses to increase substantially if, and as, we:

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continue our research and development efforts and submit additional Investigational New Drug applications, or INDs, for our product candidates;

conduct preclinical studies and clinical trials for our current and future product candidates;

further develop our product candidate platform;

continue to discover and develop additional product candidates;

maintain, expand and protect our intellectual property portfolio;

hire additional clinical, scientific manufacturing and commercial personnel;

establish a commercial manufacturing source and secure supply chain capacity sufficient to provide commercial quantities of any product candidates for which
we may obtain regulatory approval, whether through a contract manufacturing organization, or CMO, or through a manufacturing facility that we establish;

acquire  or  in-license  other  product  candidates  and  technologies,  including  advanced  manufacturing  and  translational  capabilities  that  we  will  need  for  the
further development and possible commercialization of our product candidates;

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

establish a sales, marketing and distribution infrastructure to support the sales and marketing of any product candidates for which we may obtain marketing
approvals; and

add operational, financial and management information systems and personnel, including personnel to support our product development and planned future
commercialization efforts, as well as to support our transition to a public company.

To become and remain profitable, we must succeed in developing, and eventually commercializing, a product or products that generate significant revenue. The ability to
achieve  this  success  will  require  us  to  be  effective  in  a  range  of  challenging  activities,  including  completing  preclinical  testing  and  clinical  trials  of  our  product  candidates,
discovering additional product candidates, obtaining regulatory approval for these product candidates and manufacturing, marketing and selling any products for which we may
obtain  regulatory  approval.  We  are  only  in  the  preliminary  stages  of  most  of  these  activities  and  have  not  yet  demonstrated  our  ability  to  successfully  develop  any  product
candidate,  obtain  regulatory  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 product commercialization. We may never be able to develop, manufacture or commercialize a marketable product.

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Even if we are able to succeed in these activities, we may never generate revenues that are significant enough to achieve profitability. Because of the numerous risks and
uncertainties associated with pharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses or when, or if, we will be able to
achieve profitability. Our expenses will increase if, among other things:

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there are any delays in completing our clinical trials or the development of any of our product candidates;

we are required by the FDA or other regulatory authorities to perform trials or studies in addition to, or different than, those expected; or

there are any third-party challenges to our intellectual property or we need to defend against any intellectual property-related claim.

Because  of  the  numerous  risks  and  uncertainties  associated  with  pharmaceutical  product  development,  we  are  unable  to  accurately  predict  the  timing  or  amount  of
increased expenses we will incur or when, if ever, we will be able to achieve profitability. Even if we succeed in commercializing one or more of our product candidates, we will
continue  to  incur  substantial  research  and  development  and  other  expenditures  to  develop,  seek  regulatory  approval  for  and  market  additional  product  candidates.  We  may
encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net losses will depend,
in part, on the rate of future growth of our expenses and our ability to generate revenue. Our prior losses and expected future losses have had and will continue to have an adverse
effect on our stockholders’ equity and working capital.

We have a limited operating history, which may make it difficult to evaluate the success of our business to date and to assess our future viability, and we may face
significant challenges and expense as we test our product candidates and build our capabilities.

We were incorporated in 2017 and initially acquired rights to license certain patent rights Penn in August 2018. We are early in our development efforts, have a limited
operating  history  and  are  subject  to  the  risks  inherent  to  any  newly-formed  organization,  including,  among  others,  risks  that  we  may  not  be  able  to  hire  sufficient  qualified
personnel and establish operating controls and procedures.

Our limited operating history, particularly in light of the rapidly evolving cell therapy field, may make it difficult to evaluate our technology and industry and predict our
future performance. Our short history as an operating company makes any assessment of our future success or viability subject to significant uncertainty. We will encounter risks
and difficulties frequently experienced by early-stage companies in rapidly evolving fields. If we do not address these risks successfully, our business will suffer. Similarly, we
expect that our financial condition and operating results will fluctuate significantly from quarter to quarter and year to year due to a variety of factors, many of which are beyond
our control. As a result, our shareholders should not rely upon the results of any quarterly or annual period as an indicator of future operating performance.

We currently do not have in-house resources sufficient to enable our chimeric autoantibody receptor, or CAAR, T cell platform. We are reliant on several manufacturing
and support services from Penn through a Master Translational Research Services Agreement, or the Services Agreement, as well as certain research and development and general
and administrative services through two sponsored research agreements. We also rely on Penn for access to key technologies for current manufacturing of our product candidates.
As we build our own capabilities, and enter into agreements with third parties, we expect to encounter risks and uncertainties frequently experienced by growing companies in new
and rapidly evolving fields, including the risks and uncertainties described herein. Our ability to rely on services from Penn is limited to a specified period of time, to specific
capabilities, and is subject to Penn’s right to terminate these services with or without cause. If we are unable to establish necessary relationships with third party partners and build
our own capabilities, our operating and financial results could differ materially from our expectations, and our business could suffer.

All of our programs require additional preclinical research and development, clinical development, regulatory approval in multiple jurisdictions, obtaining manufacturing
supply, capacity and expertise, building of a commercial organization, substantial investment and significant marketing efforts before we generate any revenue from product sales.
Other programs of ours require additional discovery research and then preclinical and clinical development. In

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addition, our product candidates must be licensed for marketing by the FDA before we may commercialize any product.

In addition, as an early-stage company, we have encountered and may continue to encounter unforeseen expenses, difficulties, complications, delays and other known and
unknown circumstances. As we advance our product candidates, we will need to transition from a company with a research focus to  a  company  capable  of  supporting  clinical
development and if successful, commercial activities. We may not be successful in such a transition.

We have not generated any revenue from our product candidates and our ability to generate revenue from product sales and become profitable depends significantly on
our success in a number of areas.

To become and remain profitable, we or any potential future collaborator must develop and eventually commercialize products with significant market potential at an
adequate profit margin after cost of goods sold and other expenses. All of our product candidates are in the early stages of development and we will require additional preclinical
studies,  clinical  development,  regulatory  review  and  approval,  substantial  investment,  access  to  sufficient  commercial  manufacturing  capacity  and  significant  marketing  efforts
before we can generate any revenue from product sales. We initiated our DesCAARTes TM  trial  of  DSG3-CAART,  our  most  advanced  product  candidate,  targeting  pathogenic
B cells in patients with mucosal pemphigus vulgaris, or mPV, in June 2020. Our other product candidates, which include DSG3/1-CAART, targeting pathogenic B cells in patients
with mucocutaneous pemphigus vulgaris, or mcPV, MuSK-CAART, targeting pathogenic B cells in a subset of patients with myasthenia gravis, or MG, and FVIII-CAART, for
potential use as an adjunctive therapy targeting a subset of patients with Hemophilia A who develop alloantibody resistance to Factor VIII, or FVIII, replacement therapy, have yet
to  complete  IND-enabling  studies.  We  have  not  yet  administered  any  of  our  product  candidates  in  humans  and,  as  such,  we  face  significant  translational  risk  as  our  product
candidates advance to the clinical stage. Our ability to generate revenue depends on a number of factors, including, but not limited to:

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timely completion of our preclinical studies and clinical trials, which may be significantly slower or cost more than we currently anticipate and will depend
substantially upon the performance of third-party academic and commercial contractors;

our ability to complete IND-enabling studies and successfully submit INDs or comparable applications;

whether we are required by the FDA to conduct additional clinical trials or other studies beyond those planned to support the licensure and commercialization
of our product candidates or any future product candidates;

our ability to demonstrate to the satisfaction of the FDA the safety, potency, purity and acceptable risk to benefit profile of our product candidates or any future
product candidates;

the prevalence, duration and severity of potential side effects or other safety issues experienced with our product candidates or future product candidates, if
any;

the cost of manufacturing and processing our product candidates being greater than we anticipate;

the timely receipt of necessary marketing approvals from the FDA;

the willingness of physicians, operators of clinics and patients to utilize or adopt any of our product candidates or future product candidates to treat B cell-
mediated autoimmune diseases;

our ability and the ability of third parties with whom we contract to manufacture adequate clinical and commercial supplies of our product candidates or any
future  product  candidates,  remain  in  good  standing  with  regulatory  authorities  and  develop,  validate  and  maintain  commercially  viable  manufacturing
processes that are compliant with current Good Manufacturing Practices, or cGMP;

our  ability  to  successfully  develop  a  commercial  and  competitive  strategy  and  thereafter  commercialize  our  product  candidates  or  any  future  product
candidates in the United States, if licensed for marketing, reimbursement, sale and distribution, whether alone or in collaboration with others;

patient demand for our product candidates and any future product candidates, if licensed; and

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our ability to establish and enforce intellectual property rights in and to our product candidates or any future product candidates.

Many  of  the  factors  listed  above  are  beyond  our  control  and  could  cause  us  to  experience  significant  delays  or  prevent  us  from  obtaining  regulatory  approvals  or
commercialize our product candidates. Even if we are able to commercialize our product candidates, we may not achieve profitability soon after generating product sales, if ever. If
we  are  unable  to  generate  sufficient  revenue  through  the  sale  of  our  product  candidates  or  any  future  product  candidates,  we  may  be  unable  to  continue  operations  without
continued funding.

If we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Additionally, even if we succeed in commercializing
one or more of our product candidates, we will continue to incur substantial research and development and other expenditures to research, develop and market additional product
candidates.  Our  failure  to  become  and  remain  profitable  would  decrease  the  value  of  our  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 also could cause you to lose all or part of your investment.

We may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. The size of our future net
losses will depend, in part, on the rate of future growth of our expenses and our ability to generate revenue. Our prior losses and expected future losses have had and will continue
to have an adverse effect on our stockholders’ equity and working capital.

Risks Related to Future Financial Condition

We will require substantial additional financing to develop and commercialize our product candidates and implement our operating plans. If we fail to obtain additional
financing or cannot obtain financing at the levels we require due to unstable market and economic conditions or other reasons, we may be delayed in our plans or
unable to complete the development and commercialization of our product candidates.

Our operations have consumed substantial amounts of cash since inception. We expect to continue to spend substantial amounts to continue the preclinical and clinical
development of our product candidates, including our DesCAARTes TM trial, our initial in vitro studies and expected in vivo studies of MuSK-CAART, and our planned studies for
DSG3/1-CAART as well as research and development, preclinical studies and clinical trials for FVIII-CAART and any future product candidates, to seek regulatory approvals for
our product candidates, to enable commercial production of our products, if licensed, and to initiate and complete registration trials for multiple products. While we currently expect
our existing cash and cash equivalents and investments to be sufficient to fund our operations through completion of Part A Dose Escalation of our DesCAARTes TM  trial,  we
expect  to  require  significant  additional  financing  to  complete  this  Phase  1  trial,  and  any  future  clinical  trials  of  DSG3-CAART  and  our  other  product  candidates.  Further,  if
licensed, we will require significant additional amounts of cash to launch and commercialize our product candidates.

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As  of December 31,  2020,  we  had  approximately  $108.7  million  of  cash  and  cash  equivalents  and  investments.  On  October  29,  2019,  we  completed  an  initial  public
offering of our common stock by issuing 7,275,501 shares of our common stock (including 475,501 shares of our common stock pursuant to the underwriters’ option to purchase
additional shares that we issued in November 2019), at $11.00 per share, for gross proceeds of $80.0 million, or net proceeds of $71.0 million. Based on our current operating plan,
we believe that the net proceeds from our IPO together with our existing cash and cash equivalents and investments will be sufficient to fund our operations through at least the
third quarter of 2022. However, we have based this estimate on assumptions that may prove to be wrong. Additionally, changing circumstances may cause us to consume capital
significantly faster than we currently anticipate, and we may need to spend more money than currently expected because of circumstances beyond our control. We may require
substantial  additional  capital  for  the  further  development  and  commercialization  of  our  product  candidates,  including  funding  our  internal  manufacturing  capabilities,  and  may
need to raise additional funds sooner if we choose to expand more rapidly than we presently anticipate. Because the length of time and activities associated with development of
our  product  candidates  is  highly  uncertain,  we  are  unable  to  estimate  the  actual  funds  we  will  require  for  development  and  any  approved  marketing  and  commercialization
activities. Our future funding requirements, both near- and long-term, will depend on many factors, including, but not limited to:

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the initiation, progress, timing, costs and results of preclinical studies and clinical trials for our product candidates;

the clinical development plans we establish for these product candidates;

the number and characteristics of product candidates that we may develop or in-license;

the terms of any collaboration agreements we may choose to conclude;

the outcome, timing and cost of meeting regulatory requirements established by the FDA;

the cost of filing, prosecuting, defending and enforcing our patent claims and other intellectual property rights;

the cost of defending intellectual property disputes, including patent infringement actions brought by third parties against us or our product candidates;

the effect of competing technological and market developments;

the costs of establishing and maintaining a supply chain for the development and manufacture of our product candidates;

the cost and timing of establishing, expanding and scaling manufacturing capabilities;

the cost of maintaining the amount patient data for which we would be responsible following commercialization of one or more of our product candidates; and

the cost of establishing sales, marketing and distribution capabilities for any product candidates for which we may receive regulatory approval in regions where
we choose to commercialize our products on our own.

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We cannot be certain that additional funding will be available on acceptable terms, or at all. As widely reported, global credit and financial markets have experienced
extreme  volatility  and  disruptions  from  the  COVID-19  pandemic  and  related  factors,  including  severely  diminished  liquidity  and  credit  availability,  declines  in  consumer
confidence, declines in economic growth, increases in unemployment rates and uncertainty about economic stability. There can be no assurance that further deterioration in credit
and financial markets and confidence in economic conditions will not occur. Until we are able to generate sufficient revenue to finance our cash requirements, we will need to
finance  our  future  cash  needs  through  a  combination  of  public  or  private  equity  offerings,  debt  financings,  collaborations,  strategic  alliances,  licensing  arrangements  and  other
marketing or distribution arrangements. If we are unable to raise additional capital in sufficient amounts or on terms acceptable to us, we may have to significantly delay, scale back
or discontinue our research and development initiatives and clinical development plans. We could be required to seek collaborators for our product candidates at an earlier stage
than otherwise would be desirable or on terms that are less favorable than might otherwise be available or relinquish or license on unfavorable terms our rights to our product
candidates in markets where we otherwise would seek to pursue development or commercialization ourselves.

Future  sales  and  issuances  of  our  common  stock  or  rights  to  purchase  common  stock,  including  pursuant  to  our  equity  incentive  plans,  could  result  in  additional
dilution of the percentage ownership of our stockholders and could cause our stock price to fall.

We  expect  that  significant  additional  capital  may  be  needed  in  the  future  to  continue  our  planned  operations,  including  conducting  clinical  trials,  commercialization
efforts, expanded research and development activities and costs associated with operating a public company. To raise capital, we may sell common stock, convertible securities or
other  equity  securities  in  one  or  more  transactions  at  prices  and  in  a  manner  we  determine  from  time  to  time.  If  we  sell  common  stock,  convertible  securities  or  other  equity
securities, investors may be materially diluted by subsequent sales. Such sales may also result in material dilution to our existing stockholders, and new investors could gain rights,
preferences and privileges senior to the holders of our common stock.

Pursuant  to  our  equity  incentive  plans,  our  management  is  authorized  to  grant  stock  options  to  our  employees,  directors  and  consultants. Additionally,  the  number  of
shares of our common stock reserved for issuance under the 2019 Stock Option and Incentive Plan automatically increased on January 1, 2020 and will automatically increase each
January 1 thereafter through and including January 1, 2029, by 4% of the total number of shares of our capital stock outstanding on December 31 of the preceding calendar year, or
a lesser number of shares determined by our board of directors. Unless our board of directors elects not to increase the number of shares available for future grant each year, our
stockholders may experience additional dilution, which could cause our stock price to fall.

Any  of  the  above  events  could  significantly  harm  our  business,  prospects,  financial  condition  and  results  of  operations  and  cause  the  price  of  our  common  stock  to

decline.

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Risks Related to Our Intellectual Property

We rely heavily  on  certain  in-licensed  patent  and  other  intellectual  property  rights  in  connection  with  our  development  of  our  product  candidates  and,  if  we  fail  to
comply with our obligations under our existing and any future intellectual property licenses with third parties, we could lose license rights that are important to our
business.

Our ability to develop and commercialize our product candidates is heavily dependent on in-licenses to patent rights and other intellectual property granted to us by third
parties.  For  example,  we  depend  heavily  on  our  License Agreement  with  Penn  and  CHOP,  which  was  entered  into  in  2018,  amended  and  restated  in  July  2019,  and  further
amended in May 2020, pursuant to which we obtained (a) a non-exclusive, non-sublicensable, worldwide research license to intellectual property controlled by Penn and CHOP to
make, have made and use products in two subfields of use, (b) effective as of October 2018, an exclusive, worldwide, royalty-bearing license, with the right to sublicense, under
certain of such intellectual property to make, use, sell, offer for sale and import products in the same two subfields of use, and (c) effective as of October 2018, a non-exclusive,
worldwide,  royalty-bearing  license,  with  limited  rights  to  sublicense,  under  certain  of  Penn’s  know-how,  which  know-how  satisfies  certain  criteria  and  is  listed  on  a  mutually
agreed  to  schedule,  to  make,  have  made,  use,  sell,  offer  for  sale,  import  and  have  imported  products  in  the  same  two  subfields  of  use.  We  may  enter  into  additional  license
agreements in the future. Our license agreement with Penn and CHOP imposes, and we expect that future license agreements will impose, various diligence, milestone payment,
royalty,  insurance  and  other  obligations  on  us.  If  we  fail  to  comply  with  our  obligations  under  these  licenses,  our  licensors,  including  Penn  and  CHOP,  may  have  the  right  to
terminate these license agreements, in which event we might not be able to market our product candidates. Termination of any of our license agreements or reduction or elimination
of our licensed rights may also result in our having to negotiate new or reinstated licenses with less favorable terms.

We may need to obtain additional licenses from third parties to advance our research or allow commercialization of our product candidates, and we have done so from
time to time. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, if at all. In that event, we may be required to expend significant time and
resources to develop or license replacement technology. If we are unable to do so, we may be unable to develop or commercialize the affected product candidates, which could
harm our business significantly. We cannot provide any assurances that third-party patents do not exist which might be enforced against our current product candidates or future
products, resulting in either an injunction prohibiting our sales, or, with respect to our sales, an obligation on our part to pay royalties and/or other forms of compensation to third
parties.

Furthermore,  in  many  cases,  we  may  not  have  the  right  to  control  the  preparation,  filing  and  prosecution  of  patent  applications,  or  to  maintain  the  patents,  covering
technology that we in-license from third parties. For example, pursuant to our License Agreement with Penn and CHOP, Penn controls such activities for the patent rights licensed
to us under such agreement. Therefore, although we provide input to Penn and CHOP on these activities, we cannot be certain that these patents will be prosecuted, maintained and
enforced in a manner consistent with the best interests of our business. If our current or future licensors or collaboration partners fail to obtain, maintain or protect any patents or
patent applications licensed to us, our rights to such patents and patent applications may be reduced or eliminated and our right to develop and commercialize any of our product
candidates that are the subject of such licensed rights could be adversely affected.

Disputes may arise between us and our current and future licensors regarding intellectual property subject to a license agreement, including those related to:

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the scope of rights granted under the License Agreement and other interpretation-related issues;

whether we have breached the License Agreement and whether any such breach is subject to a cure period;

whether and the extent to which our technology and processes infringe on intellectual property of the licensor that is not subject to the licensing agreement;

our right to sublicense patent and other rights to third parties under collaborative development relationships;

our diligence obligations with respect to the use of the licensed technology in relation to our development and commercialization of our product candidates,
and what activities satisfy those diligence obligations; and

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•

the ownership of inventions and know-how resulting from the joint creation or use of intellectual property by our licensors and us and our partners.

Furthermore, disputes may arise between us and our current or future licensors regarding the ownership of intellectual property developed by us, such that we may be
required to assign or otherwise transfer such intellectual property to such licensor. In the event that the assigned or transferred intellectual property is covered by an existing license
agreement with such licensor we may be required to make additional royalty or milestone payments, or both, to such licensor. If the assigned or transferred intellectual property is
not covered by an existing license agreement, then we may be required to enter into an additional license agreement to advance our research or allow commercialization of our
product candidates, which may not be available on commercially reasonable terms or at all.

If  disputes  over  intellectual  property  that  we  have  licensed,  or  license  in  the  future,  prevent  or  impair  our  ability  to  maintain  our  current  licensing  arrangements  on

acceptable terms, we may be unable to successfully develop and commercialize the affected product candidates.

If our efforts to protect the proprietary nature of the intellectual property related to our current and any future product candidates are not adequate, we may not be able
to compete effectively in our market.

Our success depends in large part on our ability to obtain and maintain intellectual property protection in the United States and other countries with respect to our product
candidates. If we do not adequately protect or enforce our intellectual property rights, competitors may be able to erode or negate any competitive advantage we may have, which
could harm our business and ability to achieve profitability. To protect our proprietary position, we have in-licensed patent rights in the United States and abroad relating to the
product candidates that are important to our business. The patent application and approval process is expensive, complex and time-consuming. Our licensors may not be able to file
and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner.

The  patent  position  of  biotechnology  and  pharmaceutical  companies  generally  is  highly  uncertain.  No  consistent  policy  regarding  the  breadth  of  claims  allowed  in
biotechnology and pharmaceutical patents has emerged to date in the United States or in many foreign jurisdictions. In addition, the determination of patent rights with respect to
biological and pharmaceutical products commonly involves complex legal and factual questions, which has in recent years been the subject of much litigation. As a result, the
issuance,  scope,  validity,  enforceability  and  commercial  value  of  our  patent  rights  are  highly  uncertain.  Pending  patent  applications  cannot  be  enforced  against  third  parties
practicing the technology claimed in such applications unless and until a patent issues from such applications. Assuming the other requirements for patentability are met, currently,
the  first  to  file  a  patent  application  is  generally  entitled  to  the  patent.  However,  prior  to  March  16,  2013,  in  the  United  States,  the  first  to  invent  was  entitled  to  the  patent.
Publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the United States and other jurisdictions are typically not
published until 18 months after filing, or in some cases not at all. Therefore, we cannot be certain that our licensors were the first to make the inventions claimed in the patents or
pending patent applications we in-license, or that our licensors were the first to file for patent protection of such inventions.

Moreover, because the issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, the patents or pending patent applications we in-
license may be challenged in the courts or patent offices in the United States and abroad. For example, we may be subject to a third party preissuance submission of prior art to the
U.S. Patent and Trademark Office, or USPTO, or become involved in post-grant review procedures, derivation proceedings, reexaminations, or inter partes review in the United
States, or oppositions and other comparable proceedings in foreign jurisdictions, challenging our patent rights or the patent rights of others. An adverse determination in any such
challenges may result in loss of exclusivity or in patent claims being narrowed, invalidated or held unenforceable, in whole or in part, which could limit our ability to stop others
from using or commercializing similar or identical technology and products, or limit the duration of the patent protection of our technology and product candidates. In addition,
given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before or shortly
after such candidates are commercialized.

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Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may diminish the value of the patents we in-license or narrow
the scope of our patent protection. In addition, the laws of foreign countries may not protect our rights to the same extent or in the same manner as the laws of the United States.
For example, European patent law is more restrictive than U.S. patent law in connection with the patentability of methods of treatment of the human body.

We cannot predict whether the patent applications we in-license currently being pursued will issue as patents, whether the claims of any patent that has or may issue will
provide us with a competitive advantage or prevent competitors from designing around the claims to develop competing technologies in a non-infringing manner, or whether we or
our licensors will be able to successfully pursue patent applications in the future relating to our current product candidates or future products and product candidates. Moreover, the
patent application and approval process is expensive and time-consuming. We or our licensors may not be able to file and prosecute all necessary or desirable patent applications at
a reasonable cost or in a timely manner. Furthermore, we, or any future partners, collaborators, or licensees, may fail to identify patentable aspects of inventions made in the course
of development and commercialization activities before it is too late to obtain patent protection on them. Therefore, we may miss potential opportunities to seek additional patent
protection.

It is possible that defects of form in the preparation or filing of patent applications may exist, or may arise in the future, for example with respect to proper priority claims,
inventorship, claim scope, or requests for patent term adjustments. If we fail to establish, maintain or protect such patents and other intellectual property rights, such rights may be
reduced or eliminated. If there are material defects in the form, preparation, prosecution or enforcement of the patents or patent applications we in-license, such patents may be
invalid and/or unenforceable, and such applications may never result in valid, enforceable patents. Any of these outcomes could impair our ability to prevent competition from third
parties, which may have an adverse impact on our business.

Even if the patent applications we in-license issue as patents, they may not issue in a form that will provide us with any meaningful protection, prevent competitors from
competing  with  us  or  otherwise  provide  us  with  any  competitive  advantage.  Our  competitors  may  be  able  to  circumvent  our  patent  rights  by  developing  similar  or  alternative
technologies or products in a non-infringing manner. Our competitors may also seek approval to market their own products similar to or otherwise competitive with our product
candidates. Alternatively, our competitors may seek to market generic versions of any approved products by submitting abbreviated BLAs to the FDA during which process they
may claim that patents licensed by us are invalid, unenforceable or not infringed. In these circumstances, we may need to defend or assert our intellectual property rights, or both,
including by filing lawsuits alleging patent infringement. In any of these types of proceedings, a court or other agency with jurisdiction may find the patents we in-license invalid or
unenforceable,  or  that  our  competitors  are  competing  in  a  non-infringing  manner.  Thus,  even  if  we  have  in-licensed  valid  and  enforceable  patents,  these  patents  still  may  not
provide  protection  against  competing  products  or  processes  sufficient  to  achieve  our  business  objectives. Any  of  the  foregoing  could  have  a  material  adverse  effect  on  our
competitive position, business, financial conditions, results of operations, and prospects.

In the future, we likely will need to expand our patent portfolio to pursue patent coverage for new product candidates that we wish to develop. The patent prosecution
process  is  competitive,  and  other  companies,  some  which  may  have  greater  resources  than  we  do  in  this  area,  may  also  be  pursuing  intellectual  property  rights  that  we  may
consider necessary or attractive in order to develop and commercialize future product candidates.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting, maintaining, defending and enforcing patents on our product candidates in all countries throughout the world would be prohibitively expensive, and
our intellectual property rights in some countries outside the United States could be less extensive than those in the United States. The deadline to pursue protection in foreign
jurisdictions for many of the patent families licensed under the License Agreement with Penn has not yet expired. Prior to applicable deadlines, we and Penn will need to decide
where  to  pursue  protection,  and  we  will  not  have  the  opportunity  to  pursue  protection  unless  we  do  so  in  applicable  jurisdictions  prior  to  the  deadlines. Although  our  License
Agreement grants us worldwide rights, there can be no assurance that we will obtain or maintain patent rights in or outside the United States under any future license agreements.
In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States even in jurisdictions where
we and our licensors pursue patent protection. Consequently, we and our licensors may

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not  be  able  to  prevent  third  parties  from  practicing  our  inventions  in  all  countries  outside  the  United  States,  even  in  jurisdictions  where  we  and  our  licensors  pursue  patent
protection,  or  from  selling  or  importing  products  made  using  our  inventions  in  and  into  the  United  States  or  other  jurisdictions.  Competitors  may  use  our  technologies  in
jurisdictions where we and our licensors have not pursued and obtained patent protection to develop their own products and, further, may export otherwise infringing products to
territories  where  we  and  our  licensors  have  patent  protection,  but  enforcement  is  not  as  strong  as  that  in  the  United  States.  These  products  may  compete  with  our  product
candidates and the patents we in-license or other intellectual property rights may not be effective or sufficient to prevent them from competing.

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

We or our licensors may be subject to claims challenging the inventorship or ownership of the patents and other intellectual property that we own or license.

We or our licensors may be subject to claims that former employees, collaborators or other third parties have an ownership interest in the patents and intellectual property
that we in-license or that we may own or in-license in the future. While it is our policy to require our employees and contractors who may be involved in the development of
intellectual property to execute agreements assigning such intellectual property to us, we may be unsuccessful in executing such an agreement with each party who in fact develops
intellectual property that we regard as our own or such assignments may not be self-executing or may be breached. Our licensors may face similar obstacles. We or our licensors
could  be  subject  to  ownership  disputes  arising,  for  example,  from  conflicting  obligations  of  employees,  consultants  or  others  who  are  involved  in  developing  our  product
candidates.  For  example,  our  scientific  co-founders,  Drs.  Payne  and  Milone,  are  members  of  our  scientific  advisory  board  and  are  also  employed  by  and  subject  to  Penn’s
intellectual property policy.  Litigation  may  be  necessary  to  defend  against  any  claims  challenging  inventorship  or  ownership.  If  we  or  our  licensors  fail  in  defending  any  such
claims, we may have to pay monetary damages and may lose valuable intellectual property rights, such as exclusive ownership of, or right to use, intellectual property, which could
adversely impact our business, results of operations and financial condition.

Some intellectual property which we have in-licensed was discovered through government funded programs and thus is subject to federal regulations such as “march-
in” rights, certain reporting requirements, and a preference for U.S. industry. Compliance with such regulations may limit our exclusive rights and limit our ability to
contract with non-U.S. manufacturers.

Certain  of  the  intellectual  property  rights  we  have  licensed,  including  rights  licensed  to  us  by  Penn  relating  to  our  DSG3-CAART  and  DSG3/1-CAART  product
candidates, was generated through the use of U.S. government funding and may therefore be subject to certain federal laws and regulations. As a result, the U.S. government has
certain rights to intellectual property embodied in our DSG3-CAART and DSG3/1-CAART product candidates and may have rights in future product candidates pursuant to the
Bayh-Dole Act of 1980. These U.S. government rights in certain inventions developed under a government-funded program include a non-exclusive, non-transferable, irrevocable
worldwide  license  to  use  inventions  for  any  governmental  purpose.  In  addition,  the  U.S.  government  has  the  right  to  require  us  to  grant  exclusive,  partially  exclusive,  or  non-
exclusive licenses to any of these inventions to a third party if it determines that: (i) adequate steps have not been taken to commercialize the invention; (ii) government action is
necessary to meet public health or safety needs; or (iii) government action is necessary to meet requirements for public use under federal regulations, also referred to as “march-
in rights”. The U.S. government also has the right to take title to these inventions if we, or the applicable licensor, such as Penn, fail to disclose the invention to the government and
fail to file an application to register the intellectual property within

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specified time limits. Intellectual property generated under a government funded program is also subject to certain reporting requirements, compliance with which may require us
or the applicable licensor to expend substantial resources. In addition, the U.S. government requires that products embodying the subject invention or produced through the use of
the subject invention be manufactured substantially in the United States. The manufacturing preference requirement can be waived if the owner of the intellectual property can
show  that  reasonable  but  unsuccessful  efforts  have  been  made  to  grant  licenses  on  similar  terms  to  potential  licensees  that  would  be  likely  to  manufacture  substantially  in  the
United States or that under the circumstances domestic manufacture is not commercially feasible. This preference for U.S. manufacturers may limit our ability to contract with non-
U.S. product manufacturers for product candidates covered by such intellectual property.

We  may  become  involved  in  lawsuits  to  protect  or  enforce  our  patent  rights  or  other  intellectual  property  rights,  which  could  be  expensive,  time  consuming  and
unsuccessful.

Competitors  may  infringe,  misappropriate  or  otherwise  violate  patents,  trademarks,  copyrights  or  other  intellectual  property  that  we  own  or  in-license.  To  counter
infringement, misappropriation or other unauthorized use, we may be required to file claims, which can be expensive and time consuming and divert the time and attention of our
management and scientific personnel. Any claims we assert against perceived violators could provoke these parties to assert counterclaims against us alleging that we infringe,
misappropriate or otherwise violate their intellectual property, in addition to counterclaims asserting that the patents we in-license are invalid or unenforceable, or both. In any
patent infringement proceeding, there is a risk that a court will decide that a patent we in-license is invalid or unenforceable, in whole or in part, and that we do not have the right to
stop the other party from using the invention at issue. There is also a risk that, even if the validity of such patents is upheld, the court will construe the patent’s claims narrowly or
decide that we do not have the right to stop the other party from using the invention at issue on the grounds that the patent claims do not cover the invention. An adverse outcome in
a litigation or proceeding involving the patents we in-license could limit our ability to assert the patent we in-license against those parties or other competitors and may curtail or
preclude our ability to exclude third parties from making and selling similar or competitive products. Any of these occurrences could adversely affect our competitive business
position, business prospects and financial condition.

Even if we establish infringement, misappropriation or another violation of our intellectual property rights, the court may decide not to grant an injunction against the
offender  and  instead  award  only  monetary  damages,  which  may  or  may  not  be  an  adequate  remedy.  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 litigation. There could also be
public announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it
could have a material adverse effect on the price of our shares. Moreover, there can be no assurance that we will have sufficient financial or other resources to file and pursue such
claims, which typically last for years before they are concluded. Even if we ultimately prevail in such claims, the monetary cost of such litigation and the diversion of the attention
of our management and scientific personnel could outweigh any benefit we receive as a result of the proceedings. Any of the foregoing may have a material adverse effect on our
business, financial condition, results of operations and prospects.

Changes in patent law in the United States and other jurisdictions could diminish the value of patents in general, thereby impairing our ability to protect our product
candidates.

Changes in either the patent laws or the interpretation of the patent laws in the United States or other jurisdictions could increase the uncertainties and costs surrounding
the prosecution of patent applications and the enforcement or defense of issued patents. On September 16, 2011, the Leahy-Smith America Invents Act, or the Leahy-Smith Act,
was  signed  into  law.  When  implemented,  the  Leahy-Smith Act  included  several  significant  changes  to  U.S.  patent  law  that  impacted  how  patent  rights  could  be  prosecuted,
enforced  and  defended.  In  particular,  the  Leahy-Smith Act  also  included  provisions  that  switched  the  United  States  from  a  “first-to-invent”  system  to  a  “first-to-file”  system,
allowed third-party submission of prior art to the USPTO during patent prosecution and set forth additional procedures to attack the validity of a patent by the USPTO administered
post grant proceedings. Under a first-to-file system, assuming the other requirements for patentability are met, the first inventor to file a patent application generally will be entitled
to the patent on an invention regardless of whether another inventor had made the invention earlier. The USPTO developed new regulations and procedures governing

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the administration of the Leahy-Smith Act, and many of the substantive changes to patent law associated with the Leahy-Smith Act, and in particular, the first to file provisions,
only became effective on March 16, 2013. It remains unclear what impact, if any, the Leahy-Smith Act will have on the operation of our business. However, the Leahy-Smith Act
and its implementation could increase the uncertainties and costs surrounding the prosecution of the patent applications we in-license and the enforcement or defense of the issued
patents we in-license, all of which could have a material adverse effect on our business.

The  patent  positions  of  companies  engaged  in  the  development  and  commercialization  of  biologics  are  particularly  uncertain.  For  example,  the  Supreme  Court  of  the
United States 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 an isolated segment 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. Thereafter, the USPTO issued a guidance memorandum instructing USPTO examiners on the ramifications of the Prometheus and Myriad rulings and apply the
Myriad ruling to natural products and principles including all naturally occurring nucleic acids. Certain claims of our in-licensed patent applications contain, and any future patents
we may obtain may contain, claims that relate to specific recombinant DNA sequences that are naturally occurring at least in part and, therefore, could be the subject of future
challenges made by third parties.

We cannot assure you that our efforts to seek patent protection for one or more of our product candidates will not be negatively impacted by this Supreme Court decision,
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 Myriad may have on the
ability of life science companies to obtain or enforce patents relating to their products in the future. These decisions, the guidance issued by the USPTO and rulings in other cases or
changes in USPTO guidance or procedures could have a material adverse effect on our existing patent rights and our ability to protect and enforce our intellectual property in the
future.

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

In addition to the protection afforded by patents, we rely on trade secret protection and confidentiality agreements to protect certain proprietary know-how that is not
patentable or that we elect not to patent, processes for which patents are difficult to enforce, and any other elements of our product candidate discovery and development processes
that involve proprietary know-how, information or technology that is not covered by patents. However, trade secrets can be difficult to protect and some courts inside and outside
the  United  States  are  less  willing  or  unwilling  to  protect  trade  secrets.  We  seek  to  protect  our  proprietary  technology  and  processes,  in  part,  by  entering  into  confidentiality
agreements with our employees, consultants, scientific advisors, and contractors. We cannot guarantee that we have entered into such agreements with each party that may have or
has had access to our trade secrets or proprietary technology and processes. We also seek to preserve the integrity and confidentiality of our data and trade secrets by maintaining
physical security of our premises and physical and electronic security of our information technology systems. While we have confidence in these individuals, organizations and
systems, agreements or security measures may be breached, and we may not have adequate remedies for any breach.

In  addition,  our  trade  secrets  may  otherwise  become  known  or  be  independently  discovered  by  competitors.  Competitors  and  other  third  parties  could  infringe,
misappropriate or otherwise violate our intellectual property rights, design around our protected technology or develop their own competitive technologies that fall outside of our
intellectual property rights. If any of our trade secrets were to be lawfully obtained or independently developed by a competitor or other third party, we would have no right to
prevent them, or those to whom they communicate it, from using that technology or information to compete with us. If our trade secrets are not adequately protected or sufficient to
provide  an  advantage  over  our  competitors,  our  competitive  position  could  be  adversely  affected,  as  could  our  business. Additionally,  if  the  steps  taken  to  maintain  our  trade
secrets are deemed inadequate, we may have insufficient recourse against third parties for misappropriating our trade secrets.

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Patent term may be inadequate to protect our competitive position on our product candidates for an adequate amount of time.

Given the amount of time required for the development, testing and regulatory review of new product candidates, patents protecting such candidates might expire before
or shortly after such candidates are commercialized. In the United States, the Drug Price Competition and Patent Term Restoration Act of 1984 permits a patent term extension of
up to five years beyond the normal expiration of the patent, which is limited to the approved indication (or any additional indications approved during the period of extension).
However, a patent term extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of the product’s approval by the FDA, only one patent
applicable to an approved drug is eligible for the extension, and only those claims covering the approved drug, a method for using it or a method for manufacturing it may be
extended. In the future, if and when our product candidates receive FDA approval, we plan to apply for patent term extensions on patents covering those product candidates in any
jurisdiction where these are available. However, the applicable authorities, including the FDA and the USPTO in the United States, and any equivalent regulatory authority in other
countries, may not agree with our assessment of whether such extensions are available, and may refuse to grant extensions to the patents we in-license, or may grant more limited
extensions than we request. Moreover, we may not receive an extension because of, for example, failing to apply within applicable deadlines, failing to apply prior to expiration of
relevant patents or otherwise failing to satisfy applicable requirements. If this occurs, our competitors may be able to take advantage of our investment in development and clinical
trials by referencing our clinical and preclinical data and launch their product earlier than might otherwise be the case.

We may be subject to claims asserting that our employees, consultants or advisors have wrongfully used or disclosed alleged trade secrets of their current or former
employers or claims asserting ownership of what we regard as our own intellectual property.

Certain  of  our  employees,  consultants  or  advisors  are  currently,  or  were  previously,  employed  at  universities  or  other  biotechnology  or  pharmaceutical  companies,
including our competitors or potential competitors. Although we try to ensure that our employees, consultants and advisors do not use the proprietary information or know-how of
others  in  their  work  for  us,  we  may  be  subject  to  claims  that  these  individuals  or  we  have  used  or  disclosed  intellectual  property,  including  trade  secrets  or  other  proprietary
information, of any such individual’s current or former employer. Litigation may be necessary to defend against these claims. If we fail in defending any such claims, in addition to
paying monetary damages, we may lose valuable intellectual property rights or personnel. Even if we are successful in defending against such claims, litigation could result in
substantial costs and be a distraction to management. Our licensors may face similar risks, which could have an adverse impact on intellectual property that is licensed to us.

Intellectual property rights do not necessarily address all potential threats.

The  degree  of  future  protection  afforded  by  our  intellectual  property  rights  is  uncertain  because  intellectual  property  rights  have  limitations  and  may  not  adequately

protect our business or permit us to maintain our competitive advantage. For example:

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others may be able to make products that are similar to our product candidates or utilize similar cell therapy technology but that are not covered by the claims
of our current or future patent portfolio;

we, or our current or future licensors or collaborators, might not have been the first to make the inventions covered by the issued patent or pending patent
application that we license now or that we may license or own in the future;

we, or our current or future licensors or collaborators, might not have been the first to file patent applications covering certain of our or their inventions;

others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our licensed intellectual property
rights;

it is possible that our current or future licensed patent applications will not lead to issued patents;

issued patents that we hold rights to may be held invalid or unenforceable, including as a result of legal challenges by our competitors or other third parties;

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our  competitors  or  other  third  parties  might  conduct  research  and  development  activities  in  countries  where  we  do  not  have  patent  rights  and  then  use  the
information learned from such activities to develop competitive products for sale in our major commercial markets;

we may not develop additional proprietary technologies that are patentable;

the patents of others may harm our business;

we  may  choose  not  to  file  a  patent  application  in  order  to  maintain  certain  trade  secrets  or  know-how,  and  a  third  party  may  subsequently  file  a  patent
application covering such intellectual property; and

third-party patents may issue with claims covering our activities; we may have infringement liability exposure arising from such patents.

Should any of these events occur, they could have a material adverse effect on our business, financial condition, results of operations and prospects.

We may become subject to claims that we are infringing certain third-party patents or other third-party intellectual property rights, any of which may prevent or delay
our development and commercialization efforts and have a material adverse effect on our business.

Our commercial success depends in part on avoiding infringing, misappropriating and otherwise violating the patents and other intellectual property and proprietary rights
of third parties. There is a substantial amount of litigation, both within and outside the United States, involving patent and other intellectual property rights in the biotechnology
and pharmaceutical industries, including patent infringement lawsuits, and administrative proceedings such as interferences, inter partes review and post grant review proceedings
before  the  USPTO  and  opposition  proceedings  before  foreign  patent  offices.  Numerous  U.S.  and  foreign  issued  patents  and  pending  patent  applications,  which  are  owned  or
controlled by third parties, including our competitors, exist in the fields in which we are pursuing product candidates. As the biotechnology and pharmaceutical industries expand
and more patents are issued, the risk increases that our product candidates may be subject to claims of infringement of the patent rights of third parties.

Third parties may assert that we or our licensors are employing their proprietary technology without authorization. There may be third-party patents or patent applications
with claims to materials, methods of manufacture or methods for treatment relating to our product candidates and, because patent applications can take many years to issue, there
may be currently pending third party patent applications which may later result in issued patents, in each case that our product candidates, their manufacture or use may infringe or
be alleged to infringe. We may fail to identify potentially relevant patents or patent applications, incorrectly conclude that a patent is invalid or does not cover our activities, or
incorrectly conclude that a patent application is unlikely to issue in a form of relevance to our activities.

Parties  making  patent  infringement  claims  against  us  may  obtain  injunctive  or  other  equitable  relief,  which  could  effectively  block  our  ability  to  further  develop  and
commercialize one or more of our product candidates. Defense of these claims, including demonstrating non-infringement, invalidity or unenforceability of the respective patent
rights in question, regardless of their merit, is time-consuming, would involve substantial litigation expense and would be a substantial diversion of employee resources from our
business. For example, in order to successfully challenge the validity of any U.S. patent in federal court, we would need to overcome a presumption of validity. This is a high
burden  requiring  us  to  present  clear  and  convincing  evidence  as  to  the  invalidity  of  any  such  U.S.  patent  claim,  and  we  can  provide  no  assurance  that  a  court  of  competent
jurisdiction would invalidate the claims of any such U.S. patent. We may not have sufficient resources to bring these actions to a successful conclusion. There could also be public
announcements of the results of hearings, motions or other interim proceedings or developments. If securities analysts or investors perceive these results to be negative, it could
have a material adverse effect on the price of our shares.

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In the event that a holder of any such patents seeks to enforce its patent rights against us with respect to one or more of our product candidates, and our defenses against
the infringement of such patent rights are unsuccessful, we may be precluded from commercializing our product candidates, even if approved, without first obtaining a license to
some or all of these patents, which may not be available on commercially reasonable terms or at all. Moreover, we may be required to pay significant fees and royalties to secure a
license to the applicable patents. Such a license may only be non-exclusive, in which case our ability to stop others from using or commercializing technology and products similar
or identical to ours may be limited. Furthermore, we could be liable for damages to the holder of these patents, which may be significant and could include treble damages if we are
found to have willfully infringed such patents. In the event that a challenge to these patents were to be unsuccessful or we were to become subject to litigation or unable to obtain a
license on commercially reasonable terms with respect to these patents, it could harm our business, financial condition, results of operations and prospects.

We are aware of third-party issued U.S. patents relating to the lentiviral vectors which may be used in the manufacture or use of our product candidates. If these patent
rights were enforced against us, we believe that we have defenses against any such action, including that these patents would not be infringed by our product candidates and/or that
these patents are not valid. However, if these patents were enforced against us and defenses to such enforcement were unsuccessful, unless we obtain a license to these patents,
which may not be available on commercially reasonable terms, or at all, we could be liable for damages and precluded from commercializing any product candidates that were
ultimately held to infringe these patents, which could have a material adverse effect on our business, financial condition, results of operations and prospects.

Even in the absence of a finding of infringement, we may need or may choose to obtain licenses from third parties to advance our research or allow commercialization of
our product candidates. We may fail to obtain any of these licenses at a reasonable cost or on reasonable terms, or at all. In that event, we would be unable to further develop and
commercialize our product candidates. Claims that we have misappropriated the confidential information or trade secrets of third parties could have a similar negative impact on
our business. Any of the foregoing could materially adversely affect our business, results of operations and financial condition.

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Risks Related to Our Reliance on Third Parties

We are reliant on a research services agreement with Penn for our nonclinical research and development activities and current manufacturing activities.

If Penn and its affiliated entities were to fail to perform their obligations in accordance with the terms of the Services Agreement or terminate the Services Agreement with
little  notice,  we  may  have  difficulty  continuing  our  normal  business  operations  and  our  business  prospects,  financial  condition  and  results  of  operations  could  be  harmed.  In
addition, the termination of our relationship with Penn and the Services Agreement and any delay in appointing or finding a suitable replacement provider, if one exists, could
make it difficult for us to operate our business for that period. Moreover, we will be reliant on Penn to assist us with any necessary technology transfer. Any delays or inadequacies
in such technology transfer, or disputes regarding the scope of such technology transfer, could delay our operations, including our clinical trials, require us to expend additional
resources and otherwise have an adverse effect on our business.

Additionally, over time we will need to transition from receiving the services that Penn currently provides to performing such services internally. The Services Agreement
is scheduled to expire on the later of October 19, 2021 or completion of all research and development projects, and unless the Services Agreement is amended, Penn will not be
obligated to provide any further services under the Services Agreement after that time. In addition, Penn has the right to terminate the Services Agreement in whole at any time
with 90 days’ notice and to terminate any research and development project being performed under the Services Agreement if the Penn service provider appointed to lead such
project is unavailable and Penn is unavailable to find a replacement within 60 days for such service provider. Penn also has the right to terminate certain manufacturing services
being performed under the Services Agreement with 180 days’ written notice. From time to time, we may enter into further addenda to the Services Agreement that provide Penn
with the right to terminate such addenda with limited notice periods. If we do not have adequate personnel and capabilities at the time that we assume responsibilities for such
services, we may not be successful in effectively or efficiently transitioning these services from Penn, which could disrupt our business and have a material adverse effect on our
financial  condition  and  results  of  operations.  Further,  we  will  incur  costs  relating  to  establishing  our  own  financial,  administrative,  information  technology  and  other  support
functions as well as running and maintaining such functions on a going-forward basis. In addition, the process of establishing such functions may distract our management from
focusing on business and strategic opportunities and could result in disruptions to our business. Even if we are able to successfully transition these services, they may be more
expensive or less efficient than the services we are receiving from Penn during the transition period.

We will rely on third parties to conduct our clinical trials. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may
not be able to obtain regulatory approval of or commercialize our product candidates.

We depend and will continue to depend upon third parties, including independent investigators and collaborators, such as universities, medical institutions, CROs and
strategic partners, to conduct our preclinical studies and clinical trials under agreements with us. Specifically, we depend on clinical trial sites to enroll patients and conduct the
DesCAARTesTM trial in a timely and appropriate manner. If our clinical trial sites do not conduct the trial on the timeline we expect or otherwise fail to support the trial, our
clinical  trial  results  could  be  significantly  delayed,  thereby  adversely  impacting  our  leadership  position  in  the  CAAR  T  industry  and  our  ability  to  progress  additional  product
candidates. Further, although we intend to transition our manufacturing needs to a CMO and eventually secure our own clinical manufacturing facility, we must currently rely on
Penn to manufacture supplies and process our product candidates. As we open additional clinical trial sites, we expect to have to negotiate budgets and contracts with CROs and
study sites, which may result in delays to our development timelines and increased costs.

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We will rely heavily on these third parties, including Penn, to conduct our preclinical studies and clinical trials, and as a result, will have limited control over the clinical
investigators and limited visibility into their day-to-day activities, including with respect to their compliance with the approved clinical protocol. Nevertheless, we are responsible
for ensuring that each of our trials is conducted in accordance with applicable protocol, legal, regulatory and scientific standards, and our reliance on third parties does not relieve
us of our regulatory responsibilities. We and these third parties are required to comply with Good Clinical Practices, or GCPs, which are regulations and guidelines enforced by the
FDA for product candidates in clinical development. Regulatory authorities enforce these GCPs through periodic inspections of trial sponsors, principal investigators and trial sites.
If we or any of these third parties fail to comply with applicable GCP requirements, the clinical data generated in our clinical trials may be deemed unreliable and the FDA may
require us to perform additional clinical trials before approving our marketing applications. We cannot provide assurance that, upon inspection, such regulatory authorities will not
determine that some or all of our clinical trials do not fully comply with the GCP requirements. For any violations of laws and regulations during the conduct of our clinical trials,
we could be subject to untitled and warning letters or enforcement action that may include civil penalties up to and including criminal prosecution. In addition, our clinical trials
must be conducted with biologic product produced under cGMPs and will require a large number of test patients. We also are required to register ongoing clinical trials and post the
results of completed  clinical  trials  on  a  government-sponsored  database  within  certain  timeframes.  Failure  to  do  so  can  result  in  fines,  adverse  publicity  and  civil  and  criminal
sanctions.

As widely reported, global credit and financial markets have experienced extreme volatility and disruptions from the COVID-19 pandemic and related factors, including
severely  diminished  liquidity  and  credit  availability,  declines  in  consumer  confidence,  declines  in  economic  growth,  increases  in  unemployment  rates  and  uncertainty  about
economic stability. In the event that one or more of our current or future service providers, manufacturers and other partners 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, due to the economic downturn or for any other reasons,
then we may not be able to obtain, or may be delayed in obtaining, marketing approvals for any product candidates we may develop and will not be able to, or may be delayed in
our efforts to, successfully commercialize our medicines. Our failure or the failure of these third parties to comply with applicable regulatory requirements or our stated protocols
could also subject us to enforcement action. Moreover, our business may be implicated if any of these third parties violates federal or state fraud and abuse or false claims laws and
regulations or healthcare privacy and security laws.

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

If any of our relationships with trial sites, or any CRO that we may use in the future, terminates, we may not be able to enter into arrangements with alternative trial sites
or CROs or do so on commercially reasonable terms. Switching or adding third parties to conduct our clinical trials involves substantial cost and requires extensive management
time and focus. In addition, there is often a natural transition period when a new third party commences work. As a result, delays may occur, which can materially impact our
ability to meet our desired clinical development timelines. Though we carefully manage our relationships with our CROs, there can be no assurance that we will not encounter
similar challenges or delays in the future or that these delays or challenges will not have a material adverse impact on our business, financial condition and prospects.

We also expect to rely on other third parties to store and distribute drug supplies for our clinical trials. Any performance failure on the part of our distributors could delay

clinical development or marketing approval of any

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product candidates we may develop or commercialization of our medicines, producing additional losses and depriving us of potential product revenue.

We intend to rely on third parties to manufacture our clinical product supplies, and we may have to rely on third parties to produce and process our product candidates,
if licensed.

Although we may eventually secure our own clinical manufacturing facility for any late phase clinical development that we undertake, we currently rely on Penn to supply
raw materials and other important components that are used to manufacture our product candidates and intend in the future to rely on CMOs. In the case of any manufacturing
performed for us by Penn, the services performed for us risk being delayed because of the competing priorities that Penn has for utilization of its manufacturing resources and any
capacity issues that thereby arise.

We do not yet have sufficient information to reliably estimate the cost of the manufacturing and processing of our product candidates in clinical quantity or commercial
quantity, and the actual cost to manufacture and process our product candidates could ultimately materially and adversely affect the commercial viability of our product candidates.
As a result, we may never be able to develop a commercially viable product.

In addition, our anticipated reliance on a limited number of third-party manufacturers exposes us to the following risks:

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We may be unable to identify manufacturers on acceptable terms or at all because the number of potential manufacturers is limited and the FDA may have
questions regarding any replacement contractor. This may require new testing and regulatory interactions. In addition, a new manufacturer would have to be
educated in, or develop substantially equivalent processes for, production of our products after receipt of FDA questions, if any.

Our  third-party  manufacturers  might  be  unable  to  timely  formulate  and  manufacture  our  product  or  produce  the  quantity  and  quality  required  to  meet  our
clinical and commercial needs, if any.

Contract manufacturers may not be able to execute our manufacturing procedures appropriately.

Any  contract  manufacturers  that  we  engage  may  not  perform  as  agreed  or  may  not  remain  in  the  contract  manufacturing  business  for  the  time  required  to
supply our clinical trials or to successfully produce, store and distribute our product candidates.

Manufacturers are subject to ongoing periodic unannounced inspection by the FDA and corresponding state agencies to ensure strict compliance with cGMP
and other government regulations. We do not have control over third-party manufacturers’ compliance with these regulations and standards.

We  may  not  own,  or  may  have  to  share,  the  intellectual  property  rights  to  any  improvements  made  by  our  third-party  manufacturers  in  the  manufacturing
process for our product candidates.

Our third-party manufacturers could breach or terminate their agreement with us.

Furthermore, all of our contract manufacturers are engaged with other companies to supply and/or manufacture materials or products for such companies, which exposes
our manufacturers to regulatory risks related to the production of such materials and products. As a result, failure to meet the regulatory requirements for the production of those
materials and products may affect the regulatory clearance of our contract manufacturers’ facilities generally. If the FDA does not approve these facilities for the manufacture of
our product candidates or if any agency withdraws its approval in the future, we may need to find alternative manufacturing facilities, which would negatively impact our ability to
develop, obtain regulatory approval for or market our product candidates, if licensed.

Our contract manufacturers would also be subject to the same risks we face in developing our own manufacturing capabilities, as described above. Each of these risks
could delay our clinical trials, the approval, if any of our product candidates by the FDA or the commercialization of our product candidates or result in higher costs or deprive us of
potential product revenue. In addition, we will rely on third parties to perform release tests on our product candidates prior to delivery to patients. If these tests are not appropriately
done and test data are not reliable, patients could be put at risk of serious harm.

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For more information, see “Risk Factors—Risks Related to Manufacturing and Supply”.

We may form or seek strategic alliances or enter into additional licensing arrangements in the future, and we may not realize the benefits of such alliances or licensing
arrangements.

We  may  form  or  seek  strategic  alliances,  create  joint  ventures  or  collaborations  or  enter  into  additional  licensing  arrangements  with  third  parties  that  we  believe  will
complement or augment our development and commercialization efforts with respect to our product candidates and any future product candidates that we may develop. Any of
these relationships may require us to incur non-recurring and other charges, increase our near and long-term expenditures, issue securities that dilute our existing stockholders or
disrupt  our  management  and  business.  In  addition,  we  face  significant  competition  in  seeking  appropriate  strategic  partners  and  the  negotiation  process  is  time-consuming  and
complex. Moreover, we may not be successful in our efforts to establish a strategic partnership or other alternative arrangements for our product candidates because they may be
deemed to be at too early of a stage of development for collaborative effort and third parties may not view our product candidates as having the requisite potential to demonstrate
safety, potency and purity. Any delays in entering into new strategic partnership agreements related to our product candidates could delay the development and commercialization
of our product candidates in certain geographies for certain indications, which would harm our business prospects, financial condition and results of operations.

If  we  license  products  or  businesses,  we  may  not  be  able  to  realize  the  benefit  of  such  transactions  if  we  are  unable  to  successfully  integrate  them  with  our  existing
operations and company culture. For instance, our License Agreement with Penn and CHOP requires significant research and development commitments that may not result in the
development  and  commercialization  of  our  product  candidates,  including  DSG3-CAART  and  our  other  product  candidates.  We  cannot  be  certain  that,  following  a  strategic
transaction or license, we will achieve the results, revenue or specific net income that justifies such transaction.

We may not realize the benefits of acquired assets or other strategic transactions, including any transactions whereby we acquire or license manufacturing and other
advanced technologies.

In August 2018, we entered into a License Agreement with Penn and CHOP which was amended and restated in July 2019, and further amended in May 2020, or the
License Agreement, pursuant to which we were granted licenses to certain patent rights for the research and development of products, as well as an exclusive license under those
same patent rights to make, use, sell and import such products, in the autoimmune disease and alloimmune response subfields, in each case, for the treatment of humans.

We actively evaluate various strategic transactions on an ongoing basis. We may acquire other businesses, products or technologies as well as pursue joint ventures or
investments in complementary businesses. The success of our strategic transactions, including the License Agreement, and any future strategic transactions depends on the risks and
uncertainties involved including:

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unanticipated liabilities related to acquired companies or joint ventures;

difficulties integrating acquired personnel, technologies and operations into our existing business;

retention of key employees;

diversion  of  management  time  and  focus  from  operating  our  business  to  management  of  strategic  alliances  or  joint  ventures  or  acquisition  integration
challenges;

increases in our expenses and reductions in our cash available for operations and other uses;

disruption in our relationships with collaborators or suppliers as a result of such a transaction; and

possible write-offs or impairment charges relating to acquired businesses or joint ventures.

If any of these risks or uncertainties occur, we may not realize the anticipated benefit of any acquisition or strategic transaction. Additionally, foreign acquisitions and

joint ventures are subject to additional risks, including those related to integration of operations across different cultures and languages, currency risks, potentially adverse

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tax consequences of overseas operations and the particular economic, political and regulatory risks associated with specific countries.

Future  acquisitions  or  dispositions  could  result  in  potentially  dilutive  issuances  of  our  equity  securities,  the  incurrence  of  debt,  contingent  liabilities  or  amortization

expenses or write-offs of goodwill, any of which could harm our financial condition.

Risks Related to Manufacturing and Supply

 We currently rely upon Penn for our manufacturing needs, and we intend to rely on other third parties for our future manufacturing needs prior to establishing our
own manufacturing facility.

We are currently reliant upon Penn for our cell product manufacturing for our lead product candidate, DSG3-CAART. In parallel with initiating our first clinical trial, we
have entered into an agreement with a CMO to help secure the manufacturing supply chain for future product candidates. We will need to develop relationships with suppliers,
increase the scale of production and demonstrate comparability of the material produced at these facilities to the material that was previously produced. Transferring manufacturing
processes and know-how is complex and involves review and incorporation of both documented and undocumented processes that may have evolved over time.

In addition, transferring production to different facilities may require utilization of new or different processes to meet the specific requirements of a given facility. We
would expect additional comparability work will also need to be conducted to support the transfer of certain manufacturing processes and process improvements. We cannot be
certain that all relevant know-how and data has been adequately incorporated into the manufacturing process until the completion of studies (and the related evaluations) intended
to demonstrate the comparability of material previously produced with that generated by any CMO that we engage for our manufacturing needs. If we are not able to successfully
transfer and produce comparable product candidates, our ability to further develop and manufacture our product candidates may be negatively impacted.

We plan to eventually establish our own manufacturing facility. While the addition of our own manufacturing facility would provide us with future flexibility within our
manufacturing  network,  we  still  may  need  to  identify  additional  CMOs  for  continued  production  of  supply  for  some  or  all  of  our  product  candidates.  Given  the  nature  of  our
manufacturing processes, the number of CMOs who possess the requisite skill and capability to manufacture our CAAR T cell immunotherapy product candidates is limited.

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Further, we may not be able to achieve clinical manufacturing and cell processing through Penn on a timely basis, on our own or at any future CMO. While our current
manufacturing process is based off the validated process developed at Penn for CD19 CAR T, or CART19, we have limited experience as an organization in managing the CAAR
T engineering process. Finally, because clinical manufacturing and cell processing is highly complex and patient donor material is inherently variable, we cannot be sure that the
manufacturing processes employed by Penn, any CMO that we engage in the future, or by us at a manufacturing facility that we establish will consistently result in T cells that will
be safe and effective.

  Our  product  candidates  are  uniquely  manufactured.  If  we,  Penn  or  any  of  our  third-party  manufacturers  encounter  difficulties  in  manufacturing  our  product
candidates, our ability to provide supply of our product candidates for clinical trials or, if licensed, for commercial sale, could be delayed or stopped, or we may be
unable to maintain a commercially viable cost structure.

The  manufacturing  process  used  to  produce  our  product  candidates  is  complex  and  novel,  and  it  has  not  yet  been  validated  for  commercial  production. Among  the
complex processes used in the manufacture of our product candidates is the manufacture of the lentiviral delivery vector used to deliver the applicable CAAR gene into the T cells.
For example, the manufacture of our product candidates includes harvesting white blood cells from each patient, stimulating certain T cells from the white blood cells and thereby
causing them to activate and proliferate, combining patient T cells with our lentiviral delivery vector through a process known as transduction, expanding the transduced T cells to
obtain the desired dose, and ultimately infusing the modified T cells back into the patient’s body. Notably, the manufacture of both DSG3/1-CAART and FVIII-CAART may be
more  challenging  or  require  new  gene  delivery  technology  due  to  the  need  to  deliver  large  transgenes  for  these  programs,  and  vector  delivery  systems  have  size  limitations.
Because of these complexities, the cost to manufacture our product candidates is higher than traditional small molecule chemical compounds and monoclonal antibodies, and the
manufacturing process is less reliable and is more difficult to reproduce. Furthermore, our manufacturing process development and scale-up is at an early stage. The actual cost to
manufacture and process our product candidates could be greater than we expect and could materially and adversely affect the commercial viability of our product candidates.

Our manufacturing process may be susceptible to technical and logistics delays or failures due to the fact that each patient is an independent manufacturing lot, and also
due  to  unique  supply  chain  requirements.    These  include the  collection  of  white  blood  cells  from  patients’  blood,  variability  in  the  quality  of  white  blood  cells  collected  from
patients’  blood,  cryopreservation  of  the  white  blood  cells  collected,  packaging  and  shipment  of  frozen  white  blood  cells  to  the  manufacturing  site  in  order  to  enable  multi-site
studies, procurement of lentiviral vectors that meet potency and purity requirements and shipment to the product candidate manufacturing site, shipment of the final product to
clinical  centers,  manufacturing  issues  associated  with  interruptions  in  the  manufacturing  process,  scheduling  constraints  for  cell  manufacturing  slots,  process  contamination,
equipment  or  reagent  failure,  improper  installation  or  operation  of  equipment,  vendor  or  operator  error,  and  inconsistency  in  cell  growth.  Even  minor  deviations  from  normal
manufacturing processes could result in reduced production yields, lot failures, product defects, product recalls, product liability claims and other supply disruptions. If microbial,
viral,  or  other  contaminations  are  discovered  in  our  product  candidates  or  in  the  manufacturing  facilities  in  which  our  product  candidates  are  made,  production  at  such
manufacturing  facilities  may  be  interrupted  for  an  extended  period  of  time  to  investigate  and  remedy  the  contamination.  Further,  as  product  candidates  are  developed  through
preclinical  studies  to  late-stage  clinical  trials  toward  approval  and  commercialization,  it  is  common  that  various  aspects  of  the  development  program,  such  as  manufacturing
methods, are altered along the way in an effort to optimize processes and results. Such changes may result in the need to enroll additional patients or to conduct additional clinical
studies to evaluate the impact of changes on product safety and efficacy. Penn has informed us that it will be unable provide clinical supply for any late-phase clinical trials of our
product candidates that we may conduct. Therefore, we will need to enter into new agreements with CMOs to produce clinical supply of our product candidates for late-phase
clinical  trials.  We  cannot  guarantee  that  we  will  be  able  to  enter  into  such  agreements  on  commercially  acceptable  terms,  if  at  all.  We  will  need  to  transfer  the  technology  to
manufacture our product candidates to these CMOs, and these CMOs may decide or be required to adopt different manufacturing protocols or processes, which may require us to
amend  any  ongoing  or  proposed  clinical  trial  protocols  or  perform  additional  preclinical  studies  to  demonstrate  the  comparability  of  any  such  new  manufacturing  protocols  or
processes. We cannot provide any assurance that Penn will provide adequate support to efficiently and effectively transfer the technology or that disputes will not arise between us
and  Penn  regarding  the  necessary  scope  of  technology  transfer,  that  the  technology  transfer  will  be  successful,  or  that  any  CMO  will  be  successful  in  producing  our  product
candidates in sufficient quantities or of acceptable quality, if at all. Such changes carry the risk that they will not achieve these intended objectives, and any of these changes could
cause our product candidates to perform differently and affect the results of ongoing and planned clinical trials or other future clinical trials.

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Although we continue to optimize our manufacturing process for our product candidates, doing so is a difficult and uncertain task, and there are risks associated with
scaling  to  the  level  required  for  advanced  clinical  trials  or  commercialization,  including,  among  others,  cost  overruns,  potential  problems  with  process  scale-up,  process
reproducibility, stability issues, lot consistency and timely availability of reagents and/or raw materials. We ultimately may not be successful in transferring our production system
from our contract manufacturer to any manufacturing facilities we may establish ourselves, or our contract manufacturer may not have the necessary capabilities to complete the
implementation and development process. If we are unable to adequately validate or scale-up the manufacturing process for our product candidates with our current manufacturer,
we will need to transfer to another manufacturer and complete the manufacturing validation process, which can be lengthy. If we are able to adequately validate and scale-up the
manufacturing process for our product candidates with a contract manufacturer, we will still need to negotiate with such contract manufacturer an agreement for commercial supply
and it is not certain we will be able to come to agreement on terms acceptable to us. As a result, we may ultimately be unable to reduce the cost of goods for our product candidates
to levels that will allow for an attractive return on investment if and when those product candidates are commercialized.

 In addition, many of the components which are required to support our cell manufacturing process, such as equipment, media, growth factors and disposables, are highly
specialized and it is possible that the supply chain for these materials may be interrupted. If we are unable to promptly remedy such interruption, then there may be delays to our
clinical development efforts.

The manufacturing process for any products that we may develop is subject to the FDA approval process, and we will need to contract with manufacturers who can
meet all applicable FDA requirements on an ongoing basis.

The manufacturing process for any products that we may develop is subject to the FDA approval process, and we will need to contract with manufacturers who can meet
all applicable FDA requirements on an ongoing basis. If we or our CMOs are unable to reliably produce products to specifications acceptable to the FDA, we may not obtain or
maintain the approvals we need to commercialize such products. Even if we obtain regulatory approval for any of our product candidates, there is no assurance that either we or our
CMOs will be able to manufacture the approved product in accordance with requirements from the FDA, to produce it in sufficient quantities to meet the requirements for the
potential launch of the product, or to meet potential future demand. Any of these challenges could delay completion of clinical trials, require bridging clinical trials or the repetition
of one or more clinical trials, increase clinical trial costs, result in sanctions being imposed on us, including clinical holds, fines, injunctions, civil penalties, delays, suspension or
withdrawal of approvals, license revocation, suspension of production or recalls of the product candidates or marketed biologics, operating restriction and criminal prosecutions,
delay approval of our product candidates, impair commercialization efforts, increase our cost of goods, and have an adverse effect on our business, financial condition, results of
operations and growth prospects. Our future success depends on our ability to manufacture our products, if licensed, on a timely basis with acceptable manufacturing costs, while at
the  same  time  maintaining  good  quality  control  and  complying  with  applicable  regulatory  requirements,  and  an  inability  to  do  so  could  have  a  material  adverse  effect  on  our
business, financial condition, and results of operations. In addition, we could incur higher manufacturing costs if manufacturing processes or standards change, and we could need
to  replace,  modify,  design,  or  build  and  install  equipment,  all  of  which  would  require  additional  capital  expenditures.  Specifically,  because  our  product  candidates  may  have  a
higher cost of goods than conventional therapies, the risk that coverage and reimbursement rates may be inadequate for us to achieve profitability may be greater.

 The manufacture of viral vectors is complex and variable, and there are a limited number of manufacturers able to supply us with viral vectors.

Our DSG3-CAART and MuSK-CAART product candidates utilize a lentiviral delivery vector and some or all of our other product candidates may require a lentiviral
delivery vector, a key drug substance that delivers the CAAR to the target T cells. We do not have the capability to manufacture lentiviral vector and plan to obtain the vector we
require  from  third  parties.  The  manufacturing  process  for  lentiviral  vector  is  variable  and  still  evolving.  It  is  not  uncommon  for  manufacturing  runs  to  fail,  whether  due  to
contamination, supplier error, or equipment failure, or to be delayed. To the extent our product candidates use a lentiviral delivery vector, a lack of vector supply will cause us to
be  unable  to  manufacture  our  CAAR  T  cells  as  well  as  a  delay  in  patient  enrollment,  which  may  have  a  negative  impact  on  our  ability  to  successfully  develop  our  product
candidates.

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Further,  there  are  a  limited  number  of  manufacturers  capable  of  producing  lentiviral  vectors.  It  can  be  challenging  to  secure  a  relationship  with  any  of  these
manufacturers, and the manufacturing and release process can take a significant amount of time. We have secured a supply of lentiviral vector from CHOP sufficient for a portion
of  the  patients  we  plan  to  enroll  in  our  DesCAARTes TM trial.  We  have  also  reserved  additional  vector  manufacturing  capacity  at  Penn and  CHOP and  we  have  engaged  other
CMOs to evaluate their potential capabilities and capacity for additional supply. There is no assurance that we will be able to secure adequate and timely supply of lentiviral vector.
Moreover, we cannot be certain that our CAAR T cell product candidates produced with lentiviral vector from different manufacturers will be comparable or that results of clinical
trials will be consistent if conducted with lentiviral vector from different manufacturers.

Vector  production  also  requires  the  production  of  high-quality  DNA  plasmids,  for  which  there  is  also  a  limited  number  of  suppliers. Although  we  have  established
relationships  with  multiple  suppliers  for  lentiviral  vector  and  plasmids,  we  do  not  yet  have  our  own  clinical-scale  manufacturing  facility  established,  and  are  therefore  highly
dependent on the ability of these suppliers to manufacture necessary materials and to deliver these materials to us on a timely and reliable basis.

 If we are to operate our own manufacturing facility, significant resources will be required and we may fail to successfully operate our facility, which could adversely
affect our clinical trials and the commercial viability of our product candidates.

If  we  establish  our  own  manufacturing  facility,  our  operations  will  be  subject  to  review  and  oversight  by  the  FDA  and  the  FDA  could  object  to  our  use  of  our
manufacturing facility. We must first receive approval from the FDA prior to licensure to manufacture our product candidates, which we may never obtain. Even if licensed, we
would  be  subject  to  ongoing  periodic  unannounced  inspection  by  the  FDA  and  corresponding  state  agencies  to  ensure  strict  compliance  with  cGMPs  and  other  government
regulations. Our license to manufacture product candidates will be subject to continued regulatory review.

Our  cost  of  goods  development  is  at  an  early  stage.  The  actual  cost  to  manufacture  and  process  our  product  candidates  could  be  greater  than  we  expect  and  could

materially and adversely affect the commercial viability of our product candidates.

  The  manufacture  of  biopharmaceutical  products  is  complex  and  requires  significant  expertise,  and  can  be  impacted  by  resource  constraints,  labor  disputes  and
workforce limitations.

The  manufacture  of  biopharmaceutical  products  is  complex  and  requires  significant  expertise,  including  the  development  of  advanced  manufacturing  techniques  and
process controls. Manufacturers of cell therapy products often encounter difficulties in production, particularly in scaling out and validating initial production and ensuring the
absence  of  contamination.  These  problems  include  difficulties  with  production  costs  and  yields,  quality  control,  including  stability  of  the  product,  quality  assurance  testing,
operator error, shortages of qualified personnel, as well as compliance with strictly enforced federal, state and foreign regulations. Furthermore, if contaminants are discovered in
our supply of product candidates or in the manufacturing facilities upon which we currently or will rely, such manufacturing facilities may need to be closed for an extended period
of time to investigate and remedy the contamination. We cannot assure you that any stability or other issues relating to the manufacture of our product candidates, whether by Penn,
by a third-party CMO, or at any manufacturing facility that we may establish, will not occur in the future.

Penn, third-party CMOs that we engage or we may fail to manage the logistics of storing and shipping our product candidates. Storage failures and shipment delays and
problems caused by us, our vendors or other factors not in our control, such as weather, could result in loss of usable product or prevent or delay the delivery of product candidates
to patients.

Penn, third-party CMOs that we engage, or we may also experience manufacturing difficulties due to resource constraints, labor disputes or workforce limitations arising
from the expanding need for manufacturing in the cell therapy field and the limited number of training programs for technical staff. If we were to encounter any of these difficulties,
our ability to provide our product candidates to patients would be jeopardized.

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 We are dependent upon the availability of specialty raw materials and the production capabilities of small manufacturers to source the components of our product
candidates.

Our product candidates require many specialty raw materials, some of which are manufactured by small companies with limited resources and experience to support a
commercial product, and the suppliers may not be able to deliver raw materials to our specifications. In addition, those suppliers generally do not have the capacity to support
commercial products manufactured under cGMP by biopharmaceutical firms. The suppliers may be ill-equipped to support our needs, especially in non-routine circumstances like
an FDA inspection or medical crisis, such as widespread contamination. We also do not have contracts with many of these suppliers, and we may not be able to contract with them
on acceptable terms or at all. Accordingly, we may experience delays in receiving key raw materials to support clinical or commercial manufacturing.

In  addition,  some  raw  materials  are  currently  available  from  a  single  supplier,  or  a  small  number  of  suppliers.  We  cannot  be  sure  that  these  suppliers  will  remain  in
business or that they will not be purchased by one of our competitors or another company that is not interested in continuing to produce these materials for our intended purpose. In
addition, the lead time needed to establish a relationship with a new supplier can be lengthy, and we may experience delays in meeting demand in the event we must switch to a
new supplier. The time and effort to qualify a new supplier could result in additional costs, diversion of resources or reduced manufacturing yields, any of which would negatively
impact  our  operating  results.  Further,  we  may  be  unable  to  enter  into  agreements  with  a  new  supplier  on  commercially  reasonable  terms,  which  could  have  a  material  adverse
impact on our business. We are also unable to predict how changing global economic conditions or global health concerns such as the COVID-19 pandemic will affect our third-
party  suppliers  and  manufacturers.  For  example,  two  vaccines  for  COVID-19  were  granted  Emergency  Use Authorization  by  the  FDA  in  late  2020,  and  more  are  likely  to  be
authorized in the coming months. The resultant demand for vaccines and potential for manufacturing facilities and materials to be commandeered under the Defense Production Act
of 1950, or equivalent foreign legislation, may make it more difficult to obtain materials or manufacturing slots for the products needed for our clinical trials, which could lead to
delays in these trials. Any negative impact of such matters on our third-party suppliers and manufacturers may also have an adverse impact on our results of operations or financial
condition.

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 We may encounter difficulties in production, particularly with respect to process development or scaling up of our manufacturing capabilities. If we encounter such
difficulties, our ability to provide supply of our CAAR T cells for clinical trials or for commercial purposes could be delayed or stopped.

Establishing  clinical  and  commercial  manufacturing  and  supply  is  a  difficult  and  uncertain  task,  and  there  are  risks  associated  with  scaling  to  the  level  required  for
advanced  clinical  trials  or  commercialization,  including,  among  others,  increased  costs,  potential  problems  with  process  scale-out,  process  reproducibility,  stability  issues,  lot
consistency, and timely availability of reagents or raw materials. For example, we may find it difficult to establish a manufacturing process that is consistent. If this occurs, we may
need to complete more than one manufacturing run for each treated patient, which would impact the availability of adequate coverage and reimbursement from third-party payors.
Competitors  that  have  developed  CAR  T  cell  therapies  have  had  difficulty  reliably  producing  engineered  T  cell  therapies  in  the  commercial  setting.  If  we  experience  similar
challenges manufacturing product candidates to approved specifications, this may limit our product candidates’  utilization  and  our  ability  to  receive  payment  for  these  product
candidates  once  licensed. Alternatively,  these  challenges  may  require  changes  to  our  manufacturing  processes,  which  could  require  us  to  perform  additional  clinical  studies,
incurring significant expense. We may ultimately be unable to reduce the expenses associated with our product candidates to levels that will allow us to achieve a profitable return
on investment.

 If we or our third-party suppliers use hazardous, non-hazardous, biological or other materials in a manner that causes injury or violates applicable law, we may be
liable for damages.

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

 Changes in product candidate manufacturing or formulation may result in additional costs or delay, which could adversely affect our business, results of operations
and financial condition.

As product candidates are developed through preclinical studies to later-stage clinical trials towards approval and commercialization, it is common that various aspects of
the development program, such as manufacturing methods or formulation, are altered along the way in an effort to optimize processes and results. Any of these changes could
cause our product candidates to perform differently and affect the results of ongoing and planned clinical trials or other future clinical trials conducted with the altered materials or
with materials made with the altered methods. Such changes may also require additional testing, or notification to, or approval by the FDA or other regulatory authorities. This
could delay completion of clinical trials, require the conduct of bridging clinical trials or studies, require the repetition of one or more clinical trials, increase clinical trial costs,
delay approval of our product candidates and/or jeopardize our ability to commence product sales and generate revenue.

Risks Related to Government Regulation

The FDA regulatory approval process is lengthy and time-consuming, and we may experience significant delays in the clinical development and regulatory approval of
our product candidates.

The research, testing, manufacturing, labeling, approval, selling, import, export, marketing and distribution of drug products, including biologics, are subject to extensive
regulation  by  the  FDA  and  other  regulatory  authorities  in  the  United  States.  We  are  not  permitted  to  market  any  biological  drug  product  in  the  United  States  until  we  receive
approval of a Biologics License Application, or BLA, from the FDA. We have not previously submitted a BLA to the FDA, or similar licensure filings to comparable foreign
authorities. A BLA must include extensive preclinical and clinical data and supporting information to establish the product candidate’s safety, potency and purity for each desired
indication. The BLA must also include significant information regarding the chemistry, manufacturing and controls for the product, including with respect to chain of identity and
chain of custody of the product.

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We expect the novel nature of our product candidates to create further challenges in obtaining regulatory approval. For example, the FDA has not previously reviewed
regulatory applications for the commercial development of CAAR T cells for treatment of pemphigus, and there is no therapy currently approved by the FDA for the treatment of
mPV. Because of this, we have little guidance as to which endpoints will be accepted, how many clinical trials we may expect to conduct, and whether open-label clinical trials will
be  deemed  acceptable,  among  other  things.  We  may  also  request  regulatory  approval  of  future  CAAR  T  cell-based  product  candidates  by  target,  regardless  of  disease  type  or
origin, which the FDA may have difficulty accepting if our clinical trials only involved diseases of certain origins. The FDA may also require a panel of experts, referred to as an
Advisory Committee, to deliberate on the adequacy of the safety, potency and purity data to support licensure. The opinion of the Advisory Committee, although not binding, may
have a significant impact on our ability to obtain licensure of the product candidates based on the completed clinical trials, as the FDA often adheres to the Advisory Committee’s
recommendations. Further, given the rapidly evolving landscape of cell therapy, we could encounter a significant change in the regulatory environment for our product candidates
once we have already begun one or more lengthy and expensive clinical trials for our product candidates. Accordingly, the regulatory approval pathway for our product candidates
may be uncertain, complex, expensive and lengthy, and approval may not be obtained.

We may also experience delays in completing ongoing and planned clinical trials for a variety of reasons, including delays related to:

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obtaining regulatory authorization to begin a trial, if applicable;

the availability of financial resources to commence and complete the planned trials;

reaching agreement on acceptable terms with prospective CROs and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary
significantly among different CROs and trial sites;

obtaining approval at each clinical trial site by an independent IRB;

recruiting suitable patients to participate in a trial;

having patients complete a trial, including having patients enrolled in clinical trials dropping out of the trial before the product candidate is manufactured and
returned to the site, or return for post-treatment follow-up;

clinical trial sites deviating from trial protocol or dropping out of a trial;

addressing any patient safety concerns that arise during a trial;

adding new clinical trial sites; or

manufacturing sufficient quantities of qualified materials under cGMPs and applying them on a patient by patient basis for use in clinical trials.

We could also encounter delays if physicians encounter unresolved ethical issues associated with enrolling patients in clinical trials of our product candidates in lieu of
prescribing existing treatments that have established safety and efficacy profiles. Further, a clinical trial may be suspended or terminated by us, the IRBs for the institutions in
which such trials are being conducted or by the FDA or other regulatory authorities due to a number of factors, including failure to conduct the clinical trial in accordance with
regulatory requirements or our clinical protocols, inspection of the clinical trial operations or trial site by the FDA or other regulatory authorities resulting in the imposition of a
clinical  hold,  unforeseen  safety  issues  or  adverse  side  effects,  failure  to  demonstrate  a  benefit  from  using  a  product  candidate,  changes  in  governmental  regulations  or
administrative  actions,  lack  of  adequate  funding  to  continue  the  clinical  trial,  or  based  on  a  recommendation  by  the  DSMB.  If  we  experience  termination  of,  or  delays  in  the
completion of, any future clinical trial of our product candidates, the commercial prospects for our product candidates will be harmed, and our ability to generate product revenue
will be delayed. In addition, any delays in completing our clinical trials will increase our costs, slow down our product development and approval process and jeopardize our ability
to commence product sales and generate revenue. Many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may ultimately lead to the
denial of regulatory approval of our product candidates.

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We expect the product candidates we develop will be regulated as biological products, or biologics, and therefore they may be subject to competition.

The Biologics Price Competition and Innovation Act of 2009, or BPCIA, was enacted as part of the Patient Protection and Affordable Care Act, as amended by the Health
Care and Education Reconciliation Act, or collectively the ACA, to establish an abbreviated pathway for the approval of biosimilar and interchangeable biological products. The
regulatory  pathway  establishes  legal  authority  for  the  FDA  to  review  and  approve  biosimilar  biologics,  including  the  possible  designation  of  a  biosimilar  as  “interchangeable”
based on its similarity to a licensed biologic. Under the BPCIA, an application for a biosimilar product cannot be licensed by the FDA until 12 years after the reference product
was licensed under a BLA. The law is complex and is still being interpreted and implemented by the FDA. In addition, as discussed more fully below, since the BPCIA was enacted
as part of the ACA, if the ACA is invalidated in its entirety as unconstitutional, then the BPCIA could be considered invalid as well. While it is uncertain when such processes
intended to implement the BPCIA may be fully adopted by the FDA, any such processes could have a material adverse effect on the future commercial prospects for our biological
product candidates.

We believe that any of the product candidates we develop that is licensed in the United States as a biological product under a BLA should qualify for the 12-year period of
exclusivity.  However,  there  is  a  risk  that  this  exclusivity  could  be  shortened  due  to  congressional  action  or  otherwise,  or  that  the  FDA  will  not  consider  the  subject  product
candidates to be reference products for competing products, potentially creating the opportunity for generic competition sooner than anticipated. Moreover, the extent to which a
biosimilar, once licensed, will be substituted for any one of the reference products in a way that is similar to traditional generic substitution for non-biological products is not yet
clear, and will depend on a number of marketplace and regulatory factors that are still developing.

The regulatory landscape that will govern our product candidates is uncertain; regulations relating to more established cell therapies and other therapies for B cell-
mediated autoimmune diseases are still developing, and changes in regulatory requirements could result in delays or discontinuation of development of our product
candidates or unexpected costs in obtaining regulatory approval.

Because  we  are  developing  novel  CAAR  T  cell  product  candidates  that  are  unique  biological  entities,  the  regulatory  requirements  that  we  will  be  subject  to  are  not
entirely  clear.  Even  with  respect  to  more  established  products  that  fit  into  the  categories  of  gene  therapies  or  cell  therapies,  the  regulatory  landscape  is  still  developing.  For
example, regulatory requirements governing gene therapy products and cell therapy products have changed frequently and may continue to change in the future. Moreover, there is
substantial,  and  sometimes  uncoordinated,  overlap  in  those  responsible  for  regulation  of  existing  gene  therapy  products  and  cell  therapy  products.  For  example,  in  the  United
States,  the  FDA  has  established  the  Office  of  Tissues  and Advanced  Therapies,  formerly  known  as  the  Office  of  Cellular,  Tissue  and  Gene  Therapies,  within  its  Center  for
Biologics Evaluation and Research, or CBER, to consolidate the review of gene therapy and related products, and the Cellular, Tissue and Gene Therapies Advisory Committee to
advise CBER on its review. Gene therapy clinical trials are also subject to review and oversight by an institutional biosafety committee, a local institutional committee that reviews
and oversees basic and clinical research conducted at the institution participating in the clinical trial. Although the FDA decides whether individual gene therapy protocols may
proceed, review process and determinations of other reviewing bodies can impede or delay the initiation of a clinical study, even if the FDA has reviewed the study and approved
its initiation. Conversely, the FDA can place an IND application on clinical hold even if such other entities have provided a favorable review. Furthermore, each clinical trial must
be reviewed and approved by an independent IRB at or servicing each institution at which a clinical trial will be conducted. In addition, adverse developments in clinical trials of
gene therapy products conducted by others may cause the FDA or other regulatory bodies to change the requirements for approval of any of our product candidates.

Complex regulatory environments exist in other jurisdictions in which we might consider seeking regulatory approvals for our product candidates, further complicating
the regulatory landscape. For example, in the European Union, a special committee called the Committee for Advanced Therapies was established within the EMA in accordance
with  Regulation  (EC)  No  1394/2007  on  advanced-therapy  medicinal  products,  or  ATMPs,  to  assess  the  quality,  safety  and  efficacy  of  ATMPs,  and  to  follow  scientific
developments in the field. ATMPs include gene therapy products as well as somatic cell therapy products and tissue engineered products. These various regulatory

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review committees and advisory groups and new or revised guidelines that they promulgate from time to time may lengthen the regulatory review process, require us to perform
additional  studies,  increase  our  development  costs,  lead  to  changes  in  regulatory  positions  and  interpretations,  delay  or  prevent  approval  and  commercialization  of  our  product
candidates or lead to significant post-approval limitations or restrictions. Because the regulatory landscape for our CAAR T cell product candidates is new, we may face even more
cumbersome  and  complex  regulations  than  those  emerging  for  gene  therapy  products  and  cell  therapy  products.  Furthermore,  even  if  our  product  candidates  obtain  required
regulatory  approvals,  such  approvals  may  later  be  withdrawn  because  of  changes  in  regulations  or  the  interpretation  of  regulations  by  applicable  regulatory  agencies.  Delay  or
failure to obtain, or unexpected costs in obtaining, the regulatory approval necessary to bring a potential product to market could decrease our ability to generate sufficient product
revenue to maintain our business.

If we are not able to obtain, or if there are delays in obtaining, required regulatory approvals for our product candidates, we will not be able to commercialize, or will
be delayed in commercializing, our product candidates, and our ability to generate revenue will be materially 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, distribution, import and export are subject to comprehensive regulation by the FDA and other regulatory
agencies in the United States. Before we can commercialize any of our product candidates, we must obtain marketing approval. We have not received approval to market any of
our product candidates from regulatory authorities in any jurisdiction and it is possible that none of our product candidates or any product candidates we may seek to develop in the
future will ever obtain regulatory approval. We, as a company, have no experience in filing and supporting the applications necessary to gain regulatory approvals and expect to
rely on third-party CROs and/or regulatory consultants 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 drug candidate’s safety, potency and purity.

Securing  regulatory  approval  also  requires  the  submission  of  information  about  the  drug  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.

The  process  of  obtaining  regulatory  approvals  is  expensive,  may  take  many  years  if  additional  clinical  trials  are  required,  if  approval  is  obtained  at  all,  and  can  vary
substantially based upon a variety of factors, including the type, complexity and novelty of the product candidates involved. 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  IND,  BLA  or  equivalent  application
types, may cause delays in the approval or rejection of an application. The FDA has substantial discretion in the approval process and may refuse to accept any application or may
decide that our data are insufficient for approval and require additional preclinical, clinical or other studies. Our product candidates could be delayed in receiving, or fail to receive,
regulatory approval for many reasons, including the following:

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•

•

the FDA may disagree with the design or implementation of our clinical trials;

we may be unable to demonstrate to the satisfaction of the FDA that a drug candidate is safe, potent and pure for its proposed indication or a related companion
diagnostic is suitable to identify appropriate patient populations;

the results of clinical trials may not meet the level of statistical significance required by the FDA for approval;

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

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

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•

the data collected from clinical trials of our product candidates may not be sufficient to support the submission of an BLA or other submission or to obtain
regulatory approval in the United States or elsewhere;

the FDA may fail to approve the manufacturing processes, test procedures and specifications, or facilities that we may establish or of third-party manufacturers
with which we may contract for clinical and commercial supplies; and

the approval policies or regulations of the FDA may significantly change in a manner rendering our clinical data insufficient for approval.

Of the large number of drugs in development, only a small percentage successfully complete the FDA approval process and are commercialized. The lengthy approval
process  as  well  as  the  unpredictability  of  future  clinical  trial  results  may  result  in  our  failing  to  obtain  regulatory  approval  to  market  our  product  candidates,  which  would
significantly harm our business, results of operations and prospects.

We expect the novel nature of our product candidates to create further challenges in obtaining regulatory approval. As a result, our ability to develop product candidates
and obtain regulatory approval may be significantly impacted. For example, the general approach for FDA approval of a new biologic or drug is for sponsors to seek licensure or
approval based on dispositive data from well-controlled, Phase 3 clinical trials of the relevant product candidate in the relevant patient population. Phase 3 clinical trials typically
involve hundreds of patients, have significant costs and take years to complete. We believe that we may be able to utilize the FDA’s Regenerative Medicine Advanced Therapy
designation for our product candidates given the limited alternatives for treatments for certain rare diseases and B cell-mediated autoimmune diseases, but the FDA may not agree
with our plans.

Moreover, approval of genetic or biomarker diagnostic tests may be necessary to advance some of our product candidates to clinical trials or potential commercialization.
In  the  future,  regulatory  agencies  may  require  the  development  and  approval  of  such  tests. Accordingly,  the  regulatory  approval  pathway  for  such  product  candidates  may  be
uncertain, complex, expensive and lengthy, and approval may not be obtained.

In addition, even if we were to obtain approval, regulatory authorities may approve any of our product candidates for fewer or more limited indications than we request,
may not approve the price we intend to charge for our products, if licensed, may grant approval contingent on the performance of costly post-marketing clinical trials, or may
approve a product candidate with a label that does not include the labeling claims necessary or desirable for the successful commercialization of that product candidate. Any of the
foregoing scenarios could materially harm the commercial prospects for our product candidates.

If we experience delays in obtaining approval or if we fail to obtain approval of our product candidates, the commercial prospects for our product candidates may be

harmed and our ability to generate revenues will be materially impaired.

Even though we may apply for orphan drug designation for our product candidates, we may not be able to obtain orphan drug marketing exclusivity.

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as a disease or condition
with a patient population of fewer than 200,000 in the United States, or a patient population of 200,000 or more in the United States when there is no reasonable expectation that
the cost of developing and making available the drug or biologic in the United States will be recovered from sales in the United States for that drug or biologic. In order to obtain
orphan  drug  designation,  the  request  must  be  made  before  submitting  a  BLA.  In  the  United  States,  orphan  drug  designation  entitles  a  party  to  financial  incentives  such  as
opportunities for grant funding towards clinical trial costs, tax advantages, and user-fee waivers. 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.

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If a product that has orphan drug designation subsequently receives the first FDA approval of that particular product for the disease for which it has such designation, the
product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications, including a BLA, to market the same biologic (meaning, a
product with the same principal molecular structural features) for the same indication for seven years, except in limited circumstances such as a showing of clinical superiority to
the product with orphan drug exclusivity or if FDA finds that the holder of the orphan drug exclusivity has not shown that it can assure the availability of sufficient quantities of the
orphan  drug  to  meet  the  needs  of  patients  with  the  disease  or  condition  for  which  the  drug  was  designated. As  a  result,  even  if  one  of  our  product  candidates  receives  orphan
exclusivity, the FDA can still approve other biologics that do not have the same principal molecular structural features for use in treating the same indication or disease or the same
biologic for a different indication or disease during the exclusivity period. Furthermore, the FDA can waive orphan exclusivity if we are unable to manufacture sufficient supply of
our product or if a subsequent applicant demonstrates clinical superiority over our product.

We have obtained from the FDA orphan drug designation for DSG3-CAART for the treatment of pemphigus vulgaris (PV). We may seek orphan drug designation for
certain other of our product candidates, but may be unable to obtain orphan drug designation for some or all of our product candidates in specific orphan indications in which we
believe there is a medically plausible basis for the use of these products. Even if we obtain orphan drug designation, exclusive marketing rights in the United States may be limited
if we seek approval for an indication broader than the orphan designated indication and may be lost if the FDA later determines that the request for designation was materially
defective or if we are unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition, or if a subsequent applicant demonstrates
clinical superiority over our products, if licensed. In addition, although we may seek orphan drug designation for other product candidates, we may never receive such designations.

A  fast  track  designation  by  the  FDA,  even  if  granted,  may  not  lead  to  a  faster  development  or  regulatory  review  or  approval  process,  and  does  not  increase  the
likelihood that our current product candidate and any future product candidates will receive marketing approval.

If a drug is intended for the treatment of a serious or life-threatening condition and the drug demonstrates the potential to address unmet medical needs for this condition,
the drug sponsor may apply for FDA fast track designation for a particular indication. Fast track is a process designed to facilitate the development, and expedite the review of
drugs  to  treat  serious  or  life-threatening  conditions  and  address  an  unmet  medical  need.  We  have  received  fast  track  designation  for  DSG3-CAART  for  improving  healing  of
mucosal blisters in patients with mPV. We may also apply for fast track designation for certain of our other product candidates, but there is no assurance that the FDA will grant
this status to any of our other current or future product candidates. Marketing applications filed by sponsors of products in fast track development may qualify for priority review
under the policies and procedures offered by the FDA, but the fast track designation does not assure any such qualification or ultimate marketing approval by the FDA. The FDA
has broad discretion whether or not to grant fast track designation, so even if we believe a particular product candidate is eligible for this designation, there can be no assurance that
the FDA would decide to grant it. Even though we have received fast track designation for DSG3-CAART for improving healing of mucosal blisters in patients with mPV, we may
not experience a faster development process, regulatory review or approval compared to conventional FDA procedures, and receiving a fast track designation does not provide
assurance of ultimate FDA approval. In addition, the FDA may withdraw fast track designation if it believes that the designation is no longer supported by data from our clinical
development program. In addition, the FDA may withdraw any fast track designation at any time.

Although  we  may  pursue  expedited  regulatory  approval  pathways  for  a  product  candidate,  it  may  not  qualify  for  expedited  development  or,  if  it  does  qualify  for
expedited development, it may not actually lead to a faster development or regulatory review or approval process.

Although  we  believe  there  may  be  an  opportunity  to  accelerate  the  development  of  certain  of  our  product  candidates  through  one  or  more  of  the  FDA’s  expedited
programs,  such  as  fast  track,  breakthrough  therapy,  Regenerative  Medicine Advanced  Therapy,  accelerated  approval  or  priority  review,  we  cannot  be  assured  that  any  of  our
product candidates will qualify for such programs.

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For  example,  we  may  seek  a  Regenerative  Medicine Advanced  Therapy,  or  RMAT,  designation  for  some  of  our  product  candidates. An  RMAT  is  defined  as  cell
therapies,  therapeutic  tissue  engineering  products,  human  cell  and  tissue  products,  and  combination  products  using  any  such  therapies  or  products.  Gene  therapies,  including
genetically modified cells that lead to a durable modification of cells or tissues may meet the definition of a Regenerative Medicine Therapy. The RMAT program is intended to
facilitate efficient development and expedite review of RMATs, which are intended to treat, modify, reverse, or cure a serious or life-threatening disease or condition. A new drug
application or a BLA for an RMAT may be eligible for priority review or accelerated approval through (1) surrogate or intermediate endpoints reasonably likely to predict long-
term clinical benefit or (2) reliance upon data obtained from a meaningful number of sites. Benefits of such designation also include early interactions with FDA to discuss any
potential surrogate or intermediate endpoint to be used to support accelerated approval. A Regenerative Medicine Therapy that is granted accelerated approval and is subject to
post-approval requirements may fulfill such requirements through the submission of clinical evidence, clinical studies, patient registries, or other sources of real world evidence,
such as electronic health records; the collection of larger confirmatory data sets; or post-approval monitoring of all patients treated with such therapy prior to its approval. Although
RMAT designation or access to any other expedited program may expedite the development or approval process, it does not change the standards for approval. If we apply for
RMAT  designation  or  any  other  expedited  program  for  our  product  candidates,  the  FDA  may  determine  that  our  proposed  target  indication  or  other  aspects  of  our  clinical
development plans do not qualify for such expedited program. Even if we are successful in obtaining a RMAT designation or access to any other expedited program, we may not
experience faster development timelines or achieve faster review or approval compared to conventional FDA procedures. Access to an expedited program may also be withdrawn
by the FDA if it believes that the designation is no longer supported by data from our clinical development program. Additionally, qualification for any expedited review procedure
does not ensure that we will ultimately obtain regulatory approval for such product candidate.

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

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

Disruptions at the FDA and other agencies may also slow the time necessary for new drugs or biologics to be reviewed and/or approved by necessary government
agencies,  which  would  adversely  affect  our  business.  For  example,  over  the  last  several  years,  including  most  recently  from  December  22,  2018  to  January  25,  2019,  the  U.S.
government has shut down several times and certain regulatory agencies, such as the FDA and the SEC, have had to furlough critical FDA, SEC and other government employees
and  stop  critical  activities.  If  a  prolonged  government  shutdown  occurs,  it  could  significantly  impact  the  ability  of  the  FDA  to  timely  review  and  process  our  regulatory
submissions, which could have a material adverse effect on our business.

Separately,  in  response  to  the  COVID-19  pandemic,  on  March  10,  2020  the  FDA  announced  its  intention  to  postpone  most  inspections  of  foreign  manufacturing
facilities and products while local, national and international conditions warrant. On March 18, 2020, the FDA announced its intention to temporarily postpone routine surveillance
inspections of domestic manufacturing facilities and provided guidance regarding the conduct of clinical trials which the FDA continues to update. As of June 23, 2020, the FDA
noted it was continuing to ensure timely reviews of applications for medical products during the COVID-19 pandemic in line with its user fee performance goals; however, FDA
may not be able to continue its current pace and approval timelines could be extended, including where a pre-approval inspection or an inspection of clinical sites is required and
due to the COVID-19 pandemic and travel restrictions FDA is unable to complete such required inspections during the review period. On July 10, 2020, the FDA announced its
goal of restarting domestic on-site inspections during the week of

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July  20,  but  such  activities  will  depend  on  data  about  the  virus’  trajectory  in  a  given  state  and  locality  and  the  rules  and  guidelines  that  are  put  in  place  by  state  and  local
governments. The FDA has developed a rating system to assist in determining when and where it is safest to conduct prioritized domestic inspections. Should FDA determine that
an inspection is necessary for approval and an inspection cannot be completed during the review cycle due to restrictions on travel, FDA has stated that it generally intends to issue
a complete response letter.  Further, if there is inadequate information to make a determination on the acceptability of a facility, FDA may defer action on the application until an
inspection  can  be  completed.  In  2020,  several  companies  announced  receipt  of  complete  response  letters  due  to  the  FDA's  inability  to  complete  required  inspections  for  their
applications. Regulatory authorities outside the U.S. may adopt similar restrictions or other policy measures in response to the COVID-19 pandemic and may experience delays in
their regulatory activities.

Risks Related to Ongoing Regulatory Obligations

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

Any  regulatory  approvals  that  we  receive  for  our  product  candidates  will  require  surveillance  to  monitor  the  safety,  potency  and  purity  of  the  product  candidate.  We
believe it is likely that the FDA will require a Risk Evaluation and Mitigation Strategy, or REMS, in order to approve our product candidates, which could entail requirements for a
medication guide, physician communication plans or additional elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization
tools.  In  addition,  if  the  FDA  approves  our  product  candidates,  the  manufacturing  processes,  labeling,  packaging,  distribution,  adverse  event  reporting,  storage,  advertising,
promotion, import, export and recordkeeping for our product candidates will be subject to extensive and ongoing regulatory requirements. These requirements include submissions
of  safety  and  other  post-marketing  information  and  reports,  registration,  as  well  as  continued  compliance  with  cGMPs  and  cGCPs  for  any  clinical  trials  that  we  conduct  post-
approval. As such, we and our contract manufacturers will be subject to continual review and inspections to assess compliance with cGMP and adherence to commitments made in
any BLA, other marketing application and previous responses to inspectional observations. Accordingly, we and others with whom we work must continue to expend time, money
and effort in all areas of regulatory compliance, including manufacturing, production and quality control. In addition, the FDA could require us to conduct another study to obtain
additional safety or biomarker information.

Further, we will be required to comply with FDA promotion and advertising rules, which include, among others, standards for direct-to-consumer advertising, restrictions
on  promoting  products  for  uses  or  in  patient  populations  that  are  not  described  in  the  product’s  approved  uses  (known  as  “off-label  use”),  limitations  on  industry-sponsored
scientific and educational activities and requirements for promotional activities involving the internet and social media. Later discovery of previously unknown problems with our
product candidates through follow-up programs with our clinical trial patients, including adverse events of unanticipated severity or frequency, or with our third-party suppliers or
manufacturing processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information, imposition of post-
market studies or clinical studies to assess new safety risks, or imposition of distribution restrictions or other restrictions under a REMS program. Other potential consequences
include, among other things:

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

fines, warning letters or holds on clinical trials;

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

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

injunctions or the imposition of civil or criminal penalties.

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The FDA’s policies may change and additional government regulations may be enacted that could prevent, limit or delay regulatory approval of our product candidates.
We  cannot  predict  the  likelihood,  nature  or  extent  of  government  regulation  that  may  arise  from  future  legislation  or  administrative  or  executive  action.  For  example,  certain
policies  of  the  current  U.S.  President’s  administration  may  impact  our  business  and  industry.  Namely,  the  current  U.S.  President’s  administration  has  taken  several  executive
actions, including the issuance of a number of Executive Orders, that could, for example, result in changes to the FDA’s priorities and allocation of resources to respond to the
COVID-19 pandemic. It is difficult to predict how these orders will be implemented, and the extent to which they will impact the FDA’s ability to exercise its regulatory authority.
If these executive actions impose restrictions on FDA’s ability to engage in oversight and implementation activities in the normal course, our business may be negatively impacted.
If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we
may lose any marketing approval that we may have obtained, and we may not achieve or sustain profitability.

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 have a material
adverse effect on the success of 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 research and development activities involve the use of biological and hazardous materials and 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, which could cause an interruption of our commercialization efforts, research and development efforts and business operations, environmental damage resulting in costly
clean-up  and  liabilities  under  applicable  laws  and  regulations  governing  the  use,  storage,  handling  and  disposal  of  these  materials  and  specified  waste  products. Although  we
believe that the safety procedures utilized by our third-party manufacturers for handling and disposing of these materials generally comply with the standards prescribed by these
laws and regulations, we cannot guarantee that this is the case or eliminate the risk of accidental contamination or injury from these materials. In such an event, we may be held
liable for any resulting damages and such liability could exceed our resources and state or federal or other applicable authorities may curtail our use of certain materials and/or
interrupt our business operations. Furthermore, environmental laws and regulations are complex, change frequently and have tended to become more stringent. We cannot predict
the  impact  of  such  changes  and  cannot  be  certain  of  our  future  compliance.  Breach  of  certain  environmental,  health  and  safety  laws  and  regulations  could  also  in  certain
circumstances constitute a breach of our License Agreement with Penn. 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.

Although  we  maintain  workers’  compensation  insurance  to  cover  us  for  costs  and  expenses,  we  may  incur  due  to  injuries  to  our  employees  resulting  from  the  use  of
hazardous  materials  or  other  work-related  injuries,  this  insurance  may  not  provide  adequate  coverage  against  potential  liabilities.  We  do  not  carry  specific  biological  waste  or
hazardous waste insurance coverage, workers compensation or property and casualty and general liability insurance policies that include coverage for damages and fines arising
from biological or hazardous waste exposure or contamination.

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

    We  are  exposed  to  the  risk  of  employee  fraud  or  other  illegal  activity  by  our  employees,  independent  contractors,  consultants,  commercial  partners  and  vendors.
Misconduct  by  these  parties  could  include  intentional,  reckless  and/or  negligent  conduct  that  fails  to  comply  with  the  laws  of  the  FDA,  provide  true,  complete  and  accurate
information to the FDA, comply with manufacturing standards we have established, comply with healthcare fraud and abuse laws in the United States and similar foreign fraudulent
misconduct laws, or report financial information or data accurately or to disclose unauthorized activities to us. If we obtain FDA approval of any of our product candidates and
begin commercializing those products in the United States, our potential exposure under such laws will increase significantly, and our costs associated with compliance with such
laws are also likely to increase. These laws may impact, among other things, our current activities with principal investigators and research patients, as well as proposed and future
sales, marketing and education programs.

Risks Related to Healthcare

Coverage and reimbursement  may  be  limited  or  unavailable  in  certain  market  segments  for  our  product  candidates,  which  could  make  it  difficult  for  us  to  sell  our
product candidates, if licensed, profitably.

Successful commercialization of our product candidates, if licensed, will depend in part on the extent to which reimbursement for those drug products will be available
from government health administration authorities, private health insurers, and other organizations. Government authorities and third-party payors, such as private health insurers
and  health  maintenance  organizations,  decide  which  drug  products  they  will  pay  for  and  establish  reimbursement  levels.  The  availability  and  extent  of  reimbursement  by
governmental and private payors is essential for most patients to be able to afford a drug product. Sales of drug products depend substantially, both domestically and abroad, on the
extent to which the costs of drugs products are paid for by health maintenance, managed care, pharmacy benefit and similar healthcare management organizations, or reimbursed by
government health administration authorities, private health coverage insurers and other third-party payors. Significant uncertainty exists as to the coverage and reimbursement
status of any product candidates for which we obtain regulatory approval. Any product candidate for which we seek regulatory approval and reimbursement will need to meet or
surpass our target product profile, or TPP, to be deemed a viable alternative to currently approved therapies. In addition, because our product candidates represent new approaches
to the treatment of B cell-mediated autoimmune diseases, we cannot accurately estimate the potential revenue from our product candidates.

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Third-party  payors  decide  which  drugs  and  treatments  they  will  cover  and  the  amount  of  reimbursement.  Reimbursement  by  a  third-party  payor  may  depend  upon  a

number of factors, including, but not limited to, the third-party payor’s determination that use of a product is:

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a covered benefit under its health plan;

safe, effective and medically necessary;

appropriate for the specific patient;

cost-effective; and

neither experimental nor investigational.

Obtaining coverage and reimbursement of a product from a government or other third-party payor is a time-consuming and costly process that could require us to provide
the payor with supporting scientific, clinical and cost-effectiveness data for the use of our products, if licensed. In the United States, the principal decisions about reimbursement
for new drug products are typically made by the Centers for Medicare and Medicaid Services, or CMS, an agency within the U.S. Department of Health and Human Services, or
HHS. CMS decides whether and to what extent a new drug product will be covered and reimbursed under Medicare, and private payors tend to follow CMS to a substantial degree.
However, no uniform policy of coverage and reimbursement for drug products exists among third-party payors and coverage and reimbursement levels for drug products can differ
significantly from payor to payor. Further, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage for the product.
Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development.

Even if we obtain coverage for a given product, if the resulting reimbursement rates are insufficient, hospitals may not approve our product for use in their facility or
third-party  payors  may  require  co-payments  that  patients  find  unacceptably  high.  Patients  are  unlikely  to  use  our  product  candidates  unless  coverage  is  provided  and
reimbursement is adequate to cover a significant portion of the cost of our product candidates. Separate reimbursement for the product itself may or may not be available. Instead,
the hospital or administering physician may be reimbursed only for providing the treatment or procedure in which our product is used. Further, from time to time, CMS revises the
reimbursement systems used to reimburse health care providers, including the Medicare Physician Fee Schedule and Outpatient Prospective Payment System, which may result in
reduced Medicare payments. In some cases, private third-party payors rely on all or portions of Medicare payment systems to determine payment rates. Changes to government
healthcare programs that reduce payments under these programs may negatively impact payments from private third-party payors, and reduce the willingness of physicians to use
our product candidates.

The marketability of any product candidates for which we receive regulatory approval for commercial sale may suffer if government and other third-party payors fail to
provide coverage and adequate reimbursement. We expect downward pressure on pharmaceutical pricing to continue. Further, coverage policies and third-party reimbursement
rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which we receive regulatory approval, less favorable
coverage policies and reimbursement rates may be implemented in the future.

Healthcare legislative measures aimed at reducing healthcare costs may have a material adverse effect on our business and results of operations.

In the United States, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could prevent or delay
regulatory  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
regulatory approval. We expect that current laws, as well as other healthcare reform measures that may be adopted in the future, may result in additional reductions in Medicare
and other healthcare funding, more rigorous coverage criteria, new payment methodologies and in additional downward pressure on the price that we, or any collaborators, may
receive for any approved products.

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In March 2010, President Obama signed into law the ACA. Among the provisions of the ACA of potential importance to our business and our product candidates are the

following:

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an annual, non-deductible fee on any entity that manufactures or imports specified branded prescription products and biologic products;

an increase in the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate Program;

a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for products that are inhaled, infused,
instilled, implanted or injected;

expansion  of  healthcare  fraud  and  abuse  laws,  including  the  civil  False  Claims Act  and  the  federal Anti-Kickback  Statute,  new  government  investigative
powers and enhanced penalties for noncompliance;

a new Medicare Part D coverage gap discount program, in which manufacturers must agree to offer 50% (increased to 70% as of January 1, 2019) point-of-
sale discounts off negotiated prices of applicable brand products to eligible beneficiaries during their coverage gap period, as a condition for the manufacturer’s
outpatient products to be covered under Medicare Part D;

extension of manufacturers’ Medicaid rebate liability to individuals enrolled in Medicaid managed care organizations;

expansion of the entities eligible for discounts under the Public Health Service pharmaceutical pricing program;

new requirements to report certain financial arrangements with physicians and teaching hospitals;

a new requirement to annually report product samples that manufacturers and distributors provide to physicians;

a  new  Patient-Centered  Outcomes  Research  Institute  to  oversee,  identify  priorities  in,  and  conduct  comparative  clinical  effectiveness  research,  along  with
funding for such research; and

established the Center for Medicare and Medicaid Innovation within CMS to test innovative payment and service delivery models.

Since its enactment, there have been numerous judicial, administrative, executive, and legislative challenges to certain aspects of the ACA, and we expect there will be
additional challenges and amendments to the ACA in the future. For example, various portions of the ACA are currently undergoing legal and constitutional challenges in the Fifth
Circuit Court and the United States Supreme Court. Additionally, the Trump Administration issued various Executive Orders which eliminated cost sharing subsidies and various
provisions that would impose a fiscal burden on states or a cost, fee, tax, penalty or regulatory burden on individuals, healthcare providers, health insurers, or manufacturers of
pharmaceuticals or medical devices, and Congress has introduced several pieces of legislation aimed at significantly revising or repealing the ACA. It is unclear whether the ACA
will be overturned, repealed, replaced, or further amended, especially under the Biden administration. We cannot predict what affect further changes to the ACA would have on
our business.

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Further legislation or regulation could be passed that could harm our business, financial condition and results of operations. Other legislative changes have been proposed
and adopted since the Affordable Care Act was enacted. For example, in August 2011, President Obama signed into law the Budget Control Act of 2011, which, among other
things included aggregate reductions to Medicare payments to providers of 2% per fiscal year, which went into effect in April 2013 and will remain in effect through 2030 unless
additional Congressional action is taken. Pursuant to the Coronavirus Aid, Relief, and Economic Security Act, also known as the CARES Act, as well as subsequent legislation,
these reductions have been suspended from May 1, 2020 through March 31, 2021 due to the COVID-19 pandemic. Proposed legislation, if passed, would extend this suspension
until the end of the pandemic. In January 2013, the American Taxpayer Relief Act of 2012 was signed into law, which, among other things, further reduced Medicare payments to
several types of providers, including hospitals, imaging centers and treatment centers, and increased the statute of limitations period for the government to recover overpayments to
providers from three to five years. These new laws and regulations may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we
may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used.

There  have  been,  and  likely  will  continue  to  be,  legislative  and  regulatory  proposals  at  the  foreign,  federal  and  state  levels  directed  at  broadening  the  availability  of
healthcare and containing or lowering the cost of healthcare. The implementation of cost containment measures or other healthcare reforms may prevent us from being able to
generate revenue, attain profitability, or commercialize our product candidates. Such reforms could have an adverse effect on anticipated revenue from product candidates that we
may successfully develop and for which we may obtain regulatory approval and may affect our overall financial condition and ability to develop product candidates.

In addition, there has been increasing legislative and enforcement interest in the United States with respect to specialty drug pricing practices. Specifically, there have
been several recent U.S. Congressional inquiries and proposed and enacted federal and state legislation designed to, among other things, bring more transparency to drug pricing,
review the relationship between pricing and manufacturer patient assistance programs, and reform government program reimbursement methodologies for drugs. For example, the
Trump administration’s budget proposal for fiscal year 2021 included a $135 billion allowance to support legislative proposals seeking to reduce drug prices, increase competition,
lower out-of-pocket drug costs for patients, and increase patient access to lower-cost generic and biosimilar drugs. On March 10, 2020, the Trump administration sent “principles”
for drug pricing to Congress, calling for legislation that would, among other things, cap Medicare Part D beneficiary out-of-pocket pharmacy expenses, provide an option to cap
Medicare  Part  D  beneficiary  monthly  out-of-pocket  expenses,  and  place  limits  on  pharmaceutical  price  increases.  Further,  the  Trump  administration  also  previously  released  a
“Blueprint”,  or  plan,  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. HHS has already started the process of soliciting feedback on some of these measures and, at the same, is immediately implementing others under its existing
authority. For example, in May 2019, CMS issued a final rule to allow Medicare Advantage Plans the option of using step therapy, a type of prior authorization, for Part B drugs
beginning January 1, 2020. This final rule codified CMS’s policy change that was effective January 1, 2019. It is unclear whether the Biden administration will challenge, reverse,
revoke or otherwise  modify  these  executive  and  administrative  actions  after  January  20,  2021.  In  addition,  there  have  been  several  changes  to  the  340B  drug  pricing  program,
which imposes ceilings on prices that drug manufacturers can charge for medications sold to certain health care facilities. On December 27, 2018, the District Court for the District
of Columbia invalidated a reimbursement formula change under the 340B drug pricing program, and CMS subsequently altered the FYs 2019 and 2018 reimbursement formula on
specified  covered  outpatient  drugs  (“SCODs”).  The  court  ruled  this  change  was  not  an  “adjustment”  which  was  within  the  Secretary’s  discretion  to  make  but  was  instead  a
fundamental change in the reimbursement calculation. However, most recently, on July 31, 2020, the U.S. Court of Appeals for the District of Columbia Circuit overturned the
district court’s decision and found that the changes were within the Secretary’s authority. On September 14, 2020, the plaintiffs-appellees filed a Petition for Rehearing En Banc
(i.e., before the full court), but was denied on October 16, 2020. It is unclear how these developments could affect covered hospitals who might purchase our future products and
affect the rates we may charge such facilities for our approved products in the future, if any.

On July 24, 2020 and September 13, 2020, President Trump announced several executive orders related to prescription drug pricing that seek to implement several of the

administration's proposals. In response, the FDA

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released a final rule on September 24, 2020, which went into effect on November 30, 2020, providing guidance for states to build and submit importation plans for drugs from
Canada. Further, on November 20, 2020 CMS issued an Interim Final Rule implementing the Most Favored Nation, or MFN, Model under which Medicare Part B reimbursement
rates  will  be  calculated  for  certain  drugs  and  biologicals  based  on  the  lowest  price  drug  manufacturers  receive  in  Organization  for  Economic  Cooperation  and  Development
countries with a similar gross domestic product per capita.  The MFN Model regulations mandate participation by identified Part B providers and will apply in all U.S. states and
territories  for  a  seven-year  period  beginning  January  1,  2021,  and  ending  December  31,  2027.    The  Interim  Final  Rule  has  not  been  finalized  and  is  subject  to  revision  and
challenge. Additionally,  on  November  20,  2020,  HHS  finalized  a  regulation  removing  safe  harbor  protection  for  price  reductions  from  pharmaceutical  manufacturers  to  plan
sponsors  under  Part  D,  either  directly  or  through  pharmacy  benefit  managers,  unless  the  price  reduction  is  required  by  law.  The  rule  also  creates  a  new  safe  harbor  for  price
reductions reflected at the point-of-sale, as well as a safe harbor for certain fixed fee arrangements between pharmacy benefit managers and manufacturers. Implementation of the
amendments to the discount safe harbor have been delayed until at least January 1, 2023. Although a number of these, and other proposed measures may require authorization
through additional legislation to become effective, and the Biden Administration may reverse or otherwise change these measures, Congress has indicated that it will continue to
seek new legislative and/or administrative measures to control drug costs. Individual states in the United States have also become increasingly active in passing legislation and
implementing regulations designed to control pharmaceutical product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access
and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing.

There have been, and likely will continue to be, legislative and regulatory proposals at the foreign, federal and state levels directed at containing or lowering the cost of
healthcare. For example, in 2016, the United Kingdom referendum on its membership in the EU resulted in a majority of the United Kingdom voters voting to exit the EU, often
referred to as “Brexit”. Pursuant to Article 50 of the Treaty on European Union, the United Kingdom ceased being a Member State of the European Union on January 31, 2020. A
transition period began February 1, 2020 and continued until December 31, 2020, during which most laws of the EU continued to apply to the United Kingdom, including the
European Union’s rules, the European Union’s pharmaceutical laws. The United Kingdom and the EU have signed a EU-UK Trade and Cooperation Agreement, which became
provisionally applicable on 1 January 1, 2021 and will become formally applicable once ratified by both the United Kingdom and the EU. This agreement provides details on how
some  aspects  of  the  United  Kingdom’s  and  EU’s  relationship  will  operate  going  forwards  however  there  are  still  many  uncertainties.    Brexit  has  already  and  may  continue  to
adversely  affect  European  and/or  worldwide  regulatory  conditions.  Brexit  could  lead  to  legal  uncertainty  and  potentially  divergent  national  laws  and  regulations  in  Europe,
including those related to the pricing of prescription pharmaceuticals, as the United Kingdom determines which EU laws to replicate or replace, which could impair our ability to
transact  business  in  the  EU  and  the  United  Kingdom  in  the  future,  if  we  elect  to  seek  regulatory  approval  and  commercialize  any  of  our  products  there,  if  approved.  The
implementation of cost containment measures or other healthcare reforms may prevent us from being able to generate revenue, attain profitability, or commercialize our product.
Such reforms could have an adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain regulatory approval and
may affect our overall financial condition and ability to develop product candidates.

We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance companies, managed care organizations and other

payors of healthcare services to contain or reduce costs of healthcare and/or impose price controls may adversely affect:

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

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

our ability to generate revenue and achieve or maintain profitability;

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

the availability of capital.

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

affect our future profitability.

Our relationships with customers, healthcare providers, physicians, and third-party payors will be subject, directly or indirectly, to federal and state healthcare fraud
and abuse laws, false claims laws, health information privacy and security laws, and other healthcare laws and regulations. If we or our employees, independent contractors,
consultants, commercial partners and vendors violate these laws, we could face substantial penalties.

These laws may impact, among other things, our clinical research program, as well as our proposed and future sales, marketing and education programs. In particular, the
promotion, sales and marketing of healthcare items and services is subject to extensive laws and regulations designed to prevent fraud, kickbacks, self-dealing and other abusive
practices,  including,  without  limitation,  the  federal Anti-Kickback  Statute  and  the  federal  False  Claims Act,  which  may  constrain  the  business  or  financial  arrangements  and
relationships  through  which  such  companies  sell,  market  and  distribute  pharmaceutical  products.  These  laws  and  regulations  may  restrict  or  prohibit  a  wide  range  of  pricing,
discounting, marketing and promotion, sales commission, customer incentive and other business arrangements. We may also be subject to federal, state and foreign laws governing
the privacy and security of individual identifiable health information and other personally identifiable information. The U.S. healthcare laws and regulations that may affect our
ability to operate include, but are not limited to:

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the  federal Anti-Kickback  Statute,  which  prohibits,  among  other  things,  knowingly  and  willfully  soliciting,  receiving,  offering  or  paying  any  remuneration
(including  any  kickback,  bribe  or  rebate),  directly  or  indirectly,  overtly  or  covertly,  in  cash  or  in  kind,  to  induce,  or  in  return  for,  either  the  referral  of  an
individual, or the purchase, lease, order or recommendation of any good, facility, item or service for which payment may be made, in whole or in part, under a
federal  healthcare  program,  such  as  the  Medicare  and  Medicaid  programs. A  person  or  entity  can  be  found  guilty  of  violating  the  statute  without  actual
knowledge of the statute or specific intent to violate it. In addition, a claim including items or services resulting from a violation of the federal Anti-Kickback
Statute  constitutes  a  false  or  fraudulent  claim  for  purposes  of  the  False  Claims Act,  or  FCA.  The Anti-Kickback  Statute  has  been  interpreted  to  apply  to
arrangements between pharmaceutical manufacturers on the one hand and prescribers, purchasers, and formulary managers on the other. There are a number of
statutory  exceptions  and  regulatory  safe  harbors  protecting  some  common  activities  from  prosecution.  On  November  20,  2020,  OIG  finalized  further
modifications  to  the  federal Anti-Kickback  Statute.  Under  the  final  rules,  OIG  added  safe  harbor  protections  under  the Anti-Kickback  Statute  for  certain
coordinated care and value-based arrangements among clinicians, providers, and others. These rules (with exceptions) became effective January 19, 2021. We
continue to evaluate what effect, if any, these rules will have on our business;

federal civil and criminal false claims laws and civil monetary penalty laws, including the FCA, which prohibit, among other things, individuals or entities
from  knowingly  presenting,  or  causing  to  be  presented,  false  or  fraudulent  claims  for  payment  to,  or  approval  by  Medicare,  Medicaid,  or  other  federal
healthcare programs, knowingly making, using or causing to be made or used a false record or statement material to a false or fraudulent claim or an obligation
to pay or transmit money to the federal government, or knowingly concealing or knowingly and improperly avoiding or decreasing or concealing an obligation
to pay money to the federal government. Manufacturers can be held liable under the FCA even when they do not submit claims directly to government payors
if they are deemed to “cause” the submission of false or fraudulent claims. The FCA also permits a private individual acting as a “whistleblower” to bring
actions on behalf of the federal government alleging violations of the FCA and to share in any monetary recovery;

the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which created new federal criminal statutes that prohibit knowingly and
willfully  executing,  or  attempting  to  execute,  a  scheme  to  defraud  any  healthcare  benefit  program  or  obtain,  by  means  of  false  or  fraudulent  pretenses,
representations, or promises, any of the money or property owned by, or under the custody or control of, any healthcare benefit program, regardless of the
payor (e.g., public or private) and knowingly and willfully falsifying, concealing or covering up by any trick or device a material fact or making any materially
false statements in connection with the delivery of, or payment for, healthcare benefits, items or services relating to healthcare matters. Similar to the federal
Anti-Kickback Statute, a person or entity

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can be found guilty of violating HIPAA without actual knowledge of the statute or specific intent to violate it;

HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act of 2009, or HITECH, and their respective implementing
regulations, which impose, among other things, requirements on certain covered healthcare providers, health plans, and healthcare clearinghouses as well as
their respective business associates that perform services for them that involve the use, or disclosure of, individually identifiable health information, relating to
the privacy, security and transmission of individually identifiable health information without appropriate authorization. HITECH also created new tiers of civil
monetary  penalties,  amended  HIPAA  to  make  civil  and  criminal  penalties  directly  applicable  to  business  associates,  and  gave  state  attorneys  general  new
authority to file civil actions for damages or injunctions in federal courts to enforce the federal HIPAA laws and seek attorneys’ fees and costs associated with
pursuing federal civil actions; the federal Physician Payment Sunshine Act, created under the Patient Protection and Affordable Care Act, and its implementing
regulations, which require manufacturers of drugs, devices, biologicals and medical supplies for which payment is available under Medicare, Medicaid or the
Children’s Health Insurance Program (with certain exceptions) to report annually to the HHS information related to payments or other transfers of value made
to  physicians  (defined  to  include  doctors,  dentists,  optometrists,  podiatrists  and  chiropractors)  and  teaching  hospitals,  as  well  as  ownership  and  investment
interests  held  by  physicians  and  their  immediate  family  members.  Effective  January  1,  2022,  these  reporting  obligations  will  extend  to  include  transfers  of
value made to certain non-physician providers such as physician assistants and nurse practitioners;

federal consumer protection and unfair competition laws, which broadly regulate marketplace activities and activities that potentially harm consumers; and

analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, which may apply to sales or marketing arrangements and
claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers, and may be broader in scope than
their  federal  equivalents;  state  and  foreign  laws  that  require  pharmaceutical  companies  to  comply  with  the  pharmaceutical  industry’s  voluntary  compliance
guidelines  and  the  relevant  compliance  guidance  promulgated  by  the  federal  government  or  otherwise  restrict  payments  that  may  be  made  to  healthcare
providers; state and foreign laws that require drug manufacturers to report information related to payments and other transfers of value to physicians and other
healthcare providers or marketing expenditures; and state and foreign laws governing the privacy and security of individually identifiable health information
and other personally identifiable information in certain circumstances, many of which differ from each other in significant ways and often are not preempted
by HIPAA, thus complicating compliance efforts.

The  distribution  of  pharmaceutical  products  is  subject  to  additional  requirements  and  regulations,  including  extensive  record-keeping,  licensing,  storage  and  security

requirements intended to prevent the unauthorized sale of pharmaceutical products.

The scope and enforcement of each of these laws is uncertain and subject to rapid change in the current environment of healthcare reform, especially in light of the lack of
applicable  precedent  and  regulations.  Federal  and  state  enforcement  bodies  have  recently  increased  their  scrutiny  of  interactions  between  healthcare  companies  and  healthcare
providers,  which  has  led  to  a  number  of  investigations,  prosecutions,  convictions  and  settlements  in  the  healthcare  industry.  Ensuring  business  arrangements  comply  with
applicable healthcare laws, as well as responding to possible investigations by government authorities, can be time- and resource-consuming and can divert a company’s attention
from the business.

The failure to comply with any of these laws or regulatory requirements subjects entities to possible legal or regulatory action. Depending on the circumstances, failure to
meet applicable regulatory requirements can result in civil, criminal and administrative penalties, damages, fines, disgorgement, individual imprisonment, possible exclusion from
participation in federal and state funded healthcare programs, contractual damages and the curtailment or restructuring of our operations, as well as additional reporting obligations
and oversight if we become subject to a corporate integrity agreement or other agreement to resolve allegations of non-compliance with these

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laws. Any action for violation of these laws, even if successfully defended, could cause a pharmaceutical manufacturer to incur significant legal expenses and divert management’s
attention from the operation of the business. Prohibitions or restrictions on sales or withdrawal of future marketed products could materially affect business in an adverse way.

Because  of  the  breadth  of  these  laws  and  the  narrowness  of  the  statutory  exceptions  and  regulatory  safe  harbors  available,  it  is  possible  that  some  of  our  business
activities, or our arrangements with physicians, some of whom receive stock options as compensation, could be subject to challenge under one or more of such laws. If we or our
employees, independent contractors, consultants, commercial partners and vendors violate these laws, we may be subject to investigations, enforcement actions and/or significant
penalties. We have adopted a code of business conduct and ethics, but it is not always possible to identify and deter employee misconduct or business noncompliance, and the
precautions we take to detect and prevent inappropriate conduct may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental
investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. Efforts to ensure that our business arrangements will comply
with  applicable  healthcare  laws  may  involve  substantial  costs.  It  is  possible  that  governmental  and  enforcement  authorities  will  conclude  that  our  business  practices  may  not
comply with current or future statutes, regulations or case law interpreting applicable fraud and abuse or other healthcare laws and regulations. If any such actions are instituted
against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business, including the imposition of civil,
criminal and administrative penalties, damages, disgorgement, monetary fines, possible exclusion from participation in Medicare, Medicaid and other federal healthcare programs,
contractual damages, reputational harm, diminished profits and future earnings, additional reporting requirements and/or oversight if we become subject to a corporate integrity
agreement or similar agreement to resolve allegations of non-compliance with these laws, and curtailment of our operations, any of which could adversely affect our ability to
operate our business and our results of operations.

Risks Related to Data and Privacy

Data collection is governed by restrictive regulations governing the use, processing, and cross-border transfer of personal information.

We  are  subject  to  stringent  privacy  and  data  protection  requirements.  The  collection,  use,  storage,  disclosure,  transfer,  or  other  processing  of  personal  data  regarding
individuals in the European Economic Area, or EEA– including health data – is governed by the European Union-wide General Data Protection Regulation, or the GDPR, which
became effective on May 25, 2018. The GDPR applies to any business, regardless of its location, that provides goods or services to residents in the EU or monitors the behavior of
individuals  within  the  European  Union.  The  GDPR  is  wide  ranging  in  scope  and  imposes  stringent  operational  requirements  for  processors  and  controllers  of  personal  data,
including, for example, special protections for “sensitive information” which includes health and genetic information of data subjects residing in the EEA, expanded disclosures to
individuals about how their personal data is to be used, limitations on retention of information, increased requirements pertaining to health data and pseudonymized (i.e.,  key-
coded)  data,  implementing  safeguards  to  protect  the  security  and  confidentiality  of  personal  data,  mandatory  data  breach  notification  requirements  and  higher  standards  for
controllers to demonstrate that they have obtained valid consent for certain data processing activities. The GDPR grants individuals the opportunity to object to the processing of
their  personal  information,  allows  them  to  request  deletion  of  personal  information  in  certain  circumstances,  and  provides  the  individual  with  an  express  right  to  seek  legal
remedies in the event the individual believes his or her rights have been violated. Further, the GDPR imposes strict rules on the transfer of personal data out of the European Union
to the United States and other jurisdictions that have not been deemed to offer “adequate” privacy protections.

The GDPR provides that European Union Member States may make their own further laws and regulations in relation to the processing of genetic, biometric or health
data, which could result in differences between Member States, limit our ability to use and share personal data or could cause our costs to increase, and harm our business and
financial condition. Our clinical trial activity conducted within the member states of the European Union is regulated by the GDPR. In addition, we are subject to evolving and strict
rules  on  the  transfer  of  personal  data  out  of  the  European  Union  to  the  United  States.  For  example,  evolution  of  laws  governing  the  cross-border  transfer  of  data,  such  as  the
invalidation of the EU–U.S. Privacy Shield, creates additional uncertainty around the legality and

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mechanics of such transfers.  Compliance with the GDPR will be a rigorous and time-intensive process that may increase our cost of doing business or require us to change our
business practices, and despite those efforts, there is a risk that we may be subject to fines and penalties, litigation, and reputational harm in connection with any future European
activities. We could be adversely affected if we fail to comply fully with all of these requirements. Failure to comply with European Union data protection laws may result in fines
(for  example,  of  up  to  €20,000,000  or  up  to  4%  of  the  total  worldwide  annual  turnover  of  the  preceding  financial  year  (whichever  is  higher)  under  the  GDPR)  and  other
administrative penalties, which may be onerous and adversely affect our business, financial condition, results of operations and prospects.

In addition, further to the United Kingdom's (UK) exit from the EU on January 31, 2020, the GDPR ceased to apply in the UK at the end of the transition period on
December 31, 2020. However, as of January 1, 2021, the UK’s European Union (Withdrawal) Act 2018 incorporated the GDPR (as it existed on December 31, 2020 but subject to
certain UK specific amendments) into UK law (referred to as the 'UK GDPR'). The UK GDPR and the UK Data Protection Act 2018 set out the UK’s data protection regime,
which is independent from but aligned to the EU’s data protection regime. Non-compliance with the UK GDPR may result in monetary penalties of up to £17.5 million or 4% of
worldwide revenue, whichever is higher. The UK, however, is now regarded as a third country under the EU’s GDPR which means that transfers of personal data from the EEA to
the UK will be restricted unless an appropriate safeguard, as recognized by the EU’s GDPR, has been put in place. Although, under the EU-UK Trade Cooperation Agreement it is
lawful to transfer personal data between the UK and the EEA for a 6 month period following the end of the transition period, with a view to achieving an adequacy decision from
the European Commission during that period. Like the EU GDPR, the UK GDPR restricts personal data transfers outside the UK to countries not regarded by the UK as providing
adequate protection (this means that personal data transfers from the UK to the EEA remain free flowing).

This lack of clarity on future UK laws and regulations and their interaction with EU laws and regulations could add legal risk, uncertainty, complexity and cost to our
handling of EU personal information and our privacy and data security compliance programs. It is possible that over time the UK Data Protection Act could become less aligned
with the EU General Data Protection Regulation, or GDPR, which could require us to implement different compliance measures for the UK and the European Union and result in
potentially enhanced compliance obligations for EU personal data.

Further, various jurisdictions around the world continue to propose new laws that regulate the privacy and/or security of certain types of personal data. Complying with
these laws, if enacted, would require significant resources and leave us vulnerable to possible fines and penalties if we are unable to comply. The regulatory framework governing
the collection, processing, storage, use and sharing of certain information is rapidly evolving and is likely to continue to be subject to uncertainty and varying interpretations. It is
possible that these laws may be interpreted and applied in a manner that is inconsistent with our existing data management practices or the features of our services and platform
capabilities. Any failure or perceived failure by us, or any third parties with which we do business, to comply with our posted privacy policies, evolving laws, rules and regulations,
industry standards, or contractual obligations to which we or such third parties are or may become subject, may result in actions or other claims against us by governmental entities
or  private  actors,  the  expenditure  of  substantial  costs,  time  and  other  resources  or  the  incurrence  of  significant  fines,  penalties  or  other  liabilities.  In  addition,  any  such  action,
particularly  to  the  extent  we  were  found  to  be  guilty  of  violations  or  otherwise  liable  for  damages,  would  damage  our  reputation  and  adversely  affect  our  business,  financial
condition and results of operations.

If our security measures are breached or unauthorized access to individually identifiable health information or other personally identifiable information is otherwise
obtained, our reputation may be harmed, and we may incur significant liabilities.

Unauthorized access to, or security breaches of, our systems and databases could result in unauthorized access to data and information and loss, compromise or corruption
of such data and information. The systems of Penn, any CMOs that we may engage in the future, and present and future CROs, contractors and consultants also could experience
breaches of security leading to the exposure of confidential and sensitive information. Cyber incidents have been increasing in sophistication and frequency and can include third
parties gaining access to employee or customer data using stolen or inferred credentials, computer malware, viruses, spamming, phishing attacks, ransomware, card skimming code,
and  other  deliberate  attacks  and  attempts  to  gain  unauthorized  access.  Because  the  techniques  used  by  computer  programmers  who  may  attempt  to  penetrate  and  sabotage  our
network security or

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our website change frequently and may not be recognized until launched against a target, we may be unable to anticipate these techniques.

It is also possible that unauthorized access to customer data may be obtained through inadequate use of security controls by customers, suppliers or other vendors. While
we are not currently aware of any impact that the SolarWinds supply chain attack had on our business, this is a recent event, and the scope of the attack is yet unknown. Therefore,
there is residual risk that we may experience a security breach arising from the SolarWinds supply chain attack.

In the event of a security breach, our company could suffer loss of business, severe reputational damage adversely affecting investor confidence, regulatory investigations
and  orders,  litigation,  indemnity  obligations,  damages  for  contract  breach,  penalties  for  violation  of  applicable  laws  or  regulations,  significant  costs  for  remediation  and  other
liabilities.  For  example,  the  loss  of  preclinical  study  or  clinical  trial  data  from  completed  or  future  preclinical  studies  or  clinical  trials  could  result  in  delays  in  our  regulatory
approval efforts and significantly increase our costs to recover or reproduce the data. 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
product candidates could be delayed.

We  have  incurred  and  expect  to  incur  significant  expenses  to  prevent  security  breaches,  including  costs  related  to  deploying  additional  personnel  and  protection
technologies, training employees, and engaging third-party solution providers and consultants. Although we expend significant resources to create security protections that shield
our customer data against potential theft and security breaches, such measures cannot provide absolute security. Moreover, as we outsource more of our information systems to
vendors and rely more on cloud-based information systems, the related security risks will increase, and we will need to expend additional resources to protect our technology and
information systems.

We  have  in  the  past  experienced  security  incidents,  and  we  may  in  the  future  experience  other  data  security  incidents  or  breaches  affecting  personally  identifiable
information  or  other  confidential  business  information.  For  example,  in  2019,  we  believe  a  phishing  incident  led  to  certain  employee  email  accounts  being  accessed  by  an
unauthorized third party. We initiated an investigation to determine whether further action was required under applicable law. The incident did not have a material impact on our
business or financial condition. While we believe we responded appropriately, including implementing remedial measures with the goal of preventing similar such events in the
future, there can be no assurance that we will be successful in these remedial and preventative measures or in successfully mitigating the effects of potential future incidents or
cyber-attacks. We remain at risk for future breaches, including, without limitation, breaches that may occur as a result of third-party action, or employee, vendor or contractor error
or malfeasance and other causes. If, in the future, we experience a data breach or security incident, we would be likely to experience harm to our reputation, financial performance,
and customer and vendor relationships, and the possibility of litigation or regulatory investigations or actions by state and federal governmental authorities and non-U.S. authorities.
Additionally,  actual,  potential  or  anticipated  attacks  may  cause  us  to  incur  increasing  costs,  including  costs  to  deploy  additional  personnel  and  protection  technologies,  train
employees, and engage third-party experts and consultants. Although we maintain cyber liability insurance, we cannot be certain that our coverage will be adequate for liabilities
actually incurred or that insurance will continue to be available to us on economically reasonable terms, or at all.  

Interruptions  in  the  availability  of  server  systems  or  communications  with  internet  or  cloud-based  services,  or  failure  to  maintain  the  security,  confidentiality,
accessibility or integrity of data stored on such systems, could harm our business.

We rely upon a variety of internet service providers, third-party web hosting facilities and cloud computing platform providers to support our business. Failure to maintain
the security, confidentiality, accessibility or integrity of data stored on such systems could result in interruptions in our operations, damage our reputation in the market, increase
our service costs, cause us to incur substantial costs, subject us to liability for damages and/or fines, and divert our resources from other tasks, any one of which could materially
adversely  affect  our  business,  financial  condition,  results  of  operations  and  prospects.  If  our  security  measures  or  those  of  our  third-party  data  center  hosting  facilities,  cloud
computing platform providers, or third-party service partners, are breached, and unauthorized access

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is obtained to our data or our information technology systems, we may incur significant legal and financial exposure and liabilities.

We also do not have control over the operations of the facilities of our cloud service providers and our third-party web hosting providers, and they also may be vulnerable
to damage or interruption from natural disasters, cybersecurity attacks, terrorist attacks, power outages and similar events or acts of misconduct. In addition, any changes in these
providers’ service levels may adversely affect our ability to meet our requirements and operate our business.

Risks Related to Ownership of Our Common Stock

Risks Related to Ownership Generally

Our principal stockholders and management own a significant percentage of our stock and will be able to exert significant control over matters subject to stockholder
approval.

Our executive officers, directors, and 5% stockholders beneficially owned, in the aggregate, approximately 71% of our outstanding voting common stock, or 64% of our
common stock, assuming all shares of non-voting common stock are converted into voting common stock in accordance with the terms of our amended and restated certificate of
incorporation. Accordingly, these stockholders will have the ability to influence us through this ownership position and significantly affect the outcome of all matters requiring
stockholder approval. For example, these stockholders may be able to significantly affect the outcome of elections of directors, amendments of our organizational documents, or
approval of any merger, sale of assets, or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that
you may feel are in your best interest as one of our stockholders.

If we fail to establish and maintain proper and effective internal control over financial reporting, our operating results and our ability to operate our business could be
harmed.

As a public company, we are required to maintain internal control over financial reporting and to report any material weaknesses in such internal controls. The Sarbanes-
Oxley Act requires that we evaluate and determine the effectiveness of our internal control over financial reporting and, beginning with our second annual report following our
initial public offering, provide a management report on internal control over financial reporting. However, while we remain an emerging growth company, we will not be required
to include an attestation report on internal control over financial reporting issued by our independent registered public accounting firm.

Ensuring that we have adequate internal financial and accounting controls and procedures in place so that we can produce accurate financial statements on a timely basis
is a costly and time-consuming effort that needs to be re-evaluated frequently. Our 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 in accordance with generally accepted accounting principles. We have begun the process
of documenting, reviewing, and improving our internal controls and procedures for compliance with Section 404 of the Sarbanes-Oxley Act. We have begun recruiting additional
finance and accounting personnel with certain skill sets that we need as a public company.

Implementing any appropriate changes to our internal controls may distract our officers and employees, entail substantial costs to modify our existing processes, and take
significant time to complete. These changes may not, however, be effective in maintaining the adequacy of our internal controls, and any failure to maintain that adequacy, or
consequent inability to produce accurate financial statements on a timely basis, could increase our operating costs and harm our business. In addition, investors’ perceptions that
our internal controls are inadequate or that we are unable to produce accurate financial statements on a timely basis may harm our stock price and make it more difficult for us to
effectively market and sell our service to new and existing customers.

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 The dual class structure of our common stock may limit your ability to influence corporate matters and may limit your visibility with respect to certain transactions.

  The dual class structure of our common stock may limit your ability to influence corporate matters. Holders of our common stock are entitled to one vote per share,
while holders of our non-voting common stock are not entitled to any votes. Nonetheless, each share of our non-voting common stock may be converted at any time into one share
of our common stock at the option of its holder by providing written notice to us, subject to the limitations provided for in our amended and restated certificate of incorporation.
Entities affiliated with or managed by Baker Brothers Life Sciences, L.P. and Adage Capital Partners, LP hold an aggregate of 4,458,004 shares of our non-voting common stock
pursuant to our Third Amended and Restated Certificate of Incorporation. At any time, upon written notice, these entities could convert a portion of these shares of non-voting
common stock into up to an aggregate of 19% of our shares of common stock. Upon 61 days’ prior written notice, these entities could convert any or all of their respective shares
of non-voting common stock into shares of common stock. Consequently, if holders of our non-voting common stock exercise their option to make this conversion, this will have
the effect of increasing the relative voting power of those prior holders of our non-voting common stock, and correspondingly decreasing the voting power of the holders of our
common stock, which may limit your ability to influence corporate matters. Additionally, stockholders who hold, in the aggregate, more than 10% of our common stock and non-
voting common stock, but 10% or less of our common stock, and are not otherwise a company insider, may not be required to report changes in their ownership due to transactions
in our non-voting common stock pursuant to Section 16(a) of the Exchange Act, and may not be subject to the short-swing profit provisions of Section 16(b) of the Exchange Act.

Sales of a substantial number of shares of our common stock by our existing stockholders in the public market could cause our stock price to fall.  

Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, or the perception in the market that holders of a
large number of shares intend to sell shares, could reduce the market price of our common stock. Certain holders of our common stock have rights, subject to conditions, to require
us to file registration statements covering their shares or to include their shares in registration statements that we may file for ourselves or other stockholders. Registration of these
shares under the Securities Act would result in the shares becoming freely tradable without restriction under the Securities Act, except for shares held by affiliates, as defined in
Rule 144 under the Securities Act. Any sales of securities by these stockholders could have a material adverse effect on the trading price of our common stock.

On November 10, 2020, we filed a registration statement on Form S-3 (File No. 333-250006) with the SEC, which was declared effective on November 18, 2020 (the
“Shelf Registration Statement”), in relation to the registration of common stock, preferred stock, debt securities, warrants and/or units of any combination thereof for the purposes
of selling, from time to time, our common stock, debt securities or other equity securities in one or more offerings. We also simultaneously entered into a Sales Agreement (the
“Sales Agreement”) with Cowen and Company, LLC, (the “Sales Agent”), to provide for the offering, issuance and sale of up to an aggregate amount of $75.0 million of our
common stock from time to time in “at-the-market” offerings under the Shelf Registration Statement and subject to the limitations thereof. The Company will pay to the Sales
Agent cash commissions of 3.0 percent of the aggregate gross proceeds of sales of common stock under the Sales Agreement. Sales of common stock, debt securities or other
equity securities by us may represent a significant percentage of our common stock currently outstanding. If we sell, or the market perceives that we intend to sell, substantial
amounts of our common stock under the Shelf Registration Statement or otherwise, the market price of our common stock could decline significantly.

We also filed a registration statement on Form S-8 registering the issuance of 4.5 million shares of common stock issued or reserved for future issuance under our equity
compensation  plans.  Shares  registered  under  this  registration  statement  on  Form  S-8  can  be  freely  sold  in  the  public  market  upon  issuance  and  once  vested,  subject  to  volume
limitations applicable to affiliates and the lock-up agreements described above. If any of these additional shares are sold, or if it is perceived that they will be sold, in the public
market, the market price of our common stock could decline.

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In addition, certain of our employees, executive officers, and directors may enter into Rule 10b5-1 trading plans providing for sales of shares of our common stock from
time  to  time.  Under  a  Rule  10b5-1  trading  plan,  a  broker  executes  trades  pursuant  to  parameters  established  by  the  employee,  director,  or  officer  when  entering  into  the  plan,
without further direction from the employee, officer, or director. A Rule 10b5-1 trading plan may be amended or terminated in some circumstances. Our employees, executive
officers, and directors also may buy or sell additional shares outside of a Rule 10b5-1 trading plan when they are not in possession of material, nonpublic information.

Risks Related to our Charter and Bylaws

Anti-takeover provisions under our charter documents and Delaware law could delay or prevent a change of control which could limit the market price of our common
stock and may prevent or frustrate attempts by our stockholders to replace or remove our current management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could delay or prevent a change of control of our company

or changes in our board of directors that our stockholders might consider favorable. Some of these provisions include:

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a board of directors divided into three classes serving staggered three-year terms, such that not all members of the board will be elected at one time;

a prohibition on stockholder action through written consent, which requires that all stockholder actions be taken at a meeting of our stockholders;

a requirement that special meetings of stockholders be called only by the chairman of the board of directors, the chief executive officer, or by a majority of the
total number of authorized directors;

advance notice requirements for stockholder proposals and nominations for election to our board of directors;

a requirement that no member of our board of directors may be removed from office by our stockholders except for cause and, in addition to any other vote
required by law, upon the approval of the holders of not less than 75% of the votes that all our stockholders would be entitled to cast in an annual election of
directors;

a requirement of approval of not less than 75% of all outstanding shares of our voting stock to amend any bylaws by stockholder action or to amend specific
provisions of our certificate of incorporation; and

the authority of the board of directors to issue preferred stock on terms determined by the board of directors without stockholder approval and which preferred
stock may include rights superior to the rights of the holders of common stock.

In addition, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporate Law, which may prohibit
certain business combinations with stockholders owning 15% or more of our outstanding voting stock. These anti-takeover provisions and other provisions in our amended and
restated certificate of incorporation and amended and restated bylaws could make it more difficult for stockholders or potential acquirors to obtain control of our board of directors
or initiate actions that are opposed by the then-current board of directors and could also delay or impede a merger, tender offer or proxy contest involving our company. These
provisions could also discourage proxy contests and make it more difficult for you and other stockholders to elect directors of your choosing or cause us to take other corporate
actions you desire. Any delay or prevention of a change of control transaction or changes in our board of directors could cause the market price of our common stock to decline.

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Our amended and restated bylaws designate certain courts as the sole and exclusive forum for certain types of actions and proceedings that may be initiated by our
stockholders, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers, or employees.

Pursuant to our amended and restated bylaws, unless we consent in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware (or, if
the Chancery Court does not have jurisdiction, the federal district court for the District of Delaware or other state courts of the State of Delaware) will be the sole and exclusive
forum for state law claims for: (i) any derivative action or proceeding brought on our behalf; (ii) any action asserting a claim of breach of a fiduciary duty or other wrongdoing by
any of our directors, officers, employees or agents to us or our stockholders; (iii) any action asserting a claim against us arising pursuant to any provision of the Delaware General
Corporation Law or our certificate of incorporation or bylaws; (iv) any action to interpret, apply, enforce or determine the validity of our certificate of incorporation or bylaws; or
(v) any action asserting a claim governed by the internal affairs doctrine (the Delaware Forum Provision). The Delaware Forum Provision will not apply to any causes of action
arising under the Securities Act of 1933, as amended (the Securities Act) or the Securities Exchange Act of 1934. In addition, our amended and restated bylaws provide that any
person or entity purchasing or otherwise acquiring any interest in shares of our common stock is deemed to have notice of and consented to the foregoing provisions. We recognize
that the forum selection clause in our bylaws may impose additional litigation costs on stockholders in pursuing any such claims, particularly if the stockholders do not reside in or
near the State of Delaware. Additionally, the forum selection clauses in our amended and restated bylaws may limit our stockholders’ ability to bring a claim in a forum that they
find favorable for disputes with us or our directors, officers or employees, which may discourage such lawsuits against us and our directors, officers and employees even though an
action,  if  successful,  might  benefit  our  stockholders.  The  Court  of  Chancery  of  the  State  of  Delaware  may  also  reach  different  judgments  or  results  than  would  other  courts,
including courts where a stockholder considering an action may be located or would otherwise choose to bring the action, and such judgments may be more or less favorable to us
than our stockholders. Alternatively, if a court were to find the choice of forum provision contained in our amended and restated bylaws to be inapplicable or unenforceable in an
action, we may incur additional costs associated with resolving such action in other jurisdictions, which could materially adversely affect our business, financial condition and
operating results.

Risks Related to Tax

Changes in tax laws could adversely affect our business and financial condition.

The  rules  dealing  with  U.S.  federal,  state,  and  local  income  taxation  are  constantly  under  review  by  persons  involved  in  the  legislative  process  and  by  the  Internal
Revenue Service and the U.S. Treasury Department. Changes to tax laws (which changes may have retroactive application) could adversely affect us or holders of our common
stock. In recent years, many such changes have been made and changes are likely to continue to occur in the future. Future changes in tax laws could have a material adverse effect
on our business, cash flow, financial condition or results of operations. Prospective investors in our common stock should consult with their legal and tax advisors with respect to
potential changes in tax laws and the tax consequences of investing in or holding our common stock.

Our ability to utilize our net operating losses and certain other tax attributes to offset future taxable income may be subject to certain limitations.

As  of  December  31,  2020,  we  had  U.S.  federal,  state  and  local  net  operating  loss  carryforwards  of  $45.6  million,  $47.7  million  and  $38.6  million,  respectively.  $0.3
million of the federal amounts expire in 2037. The state net operating losses begin to expire in 2037 and the local net operating losses begin to expire in 2039. Approximately
$45.3 million of the federal net operating losses can be carried forward indefinitely. Certain net operating loss carryforwards could expire unused and be unavailable to offset future
taxable income. In addition, in general, under Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, or the Code, and corresponding provisions of state law, a
corporation that undergoes an “ownership change” is subject to limitations on its ability to utilize its pre-change net operating loss carryforwards or tax credits, or NOLs or credits,
to offset future taxable income or taxes. For these purposes, an ownership change generally occurs where the aggregate stock ownership of one or more stockholders or groups of
stockholders who owns at least 5% of a corporation’s stock increases its ownership by more than 50 percentage points over its lowest ownership percentage within a specified
testing period. Our existing NOLs or credits may be subject to limitations arising from previous ownership changes,

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and if we undergo an ownership change, our ability to utilize NOLs or credits could be further limited by Sections 382 and 383 of the Code. In addition, future changes in our stock
ownership, many of which are outside of our control, could result in an ownership change under Sections 382 and 383 of the Code. Our NOLs or credits may also be impaired
under state law. Accordingly, we may not be able to utilize a material portion of our NOLs or credits. Furthermore, our ability to utilize our NOLs or credits is conditioned upon
our attaining profitability and generating U.S. federal and state taxable income. As described above under “—Risks Related to Our Financial Condition and Capital Requirements”,
we have incurred significant net losses since our inception and anticipate that we will continue to incur significant losses for the foreseeable future; and therefore, we do not know
whether or when we will generate the U.S. federal or state taxable income necessary to utilize our NOLs or credits. Under current law, U.S. federal net operating loss carryforwards
generated in taxable years beginning after December 31, 2017 will not be subject to expiration. However, any such net  operating  loss  carryforwards may only offset 80% of our
annual taxable income in taxable years beginning after December 31, 2020.
General Risk Factors

The price of our stock may be volatile, and you could lose all or part of your investment.

The trading price of our common stock is likely to be highly volatile and could be subject to wide fluctuations in response to various factors, some of which are beyond

our control, including limited trading volume. In addition to the factors discussed in this “Risk Factors” section, these factors include:

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the  commencement,  enrollment  or  results  of  our  planned  preclinical  studies  or  clinical  trials  of  our  product  candidates  or  any  preclinical  studies  or  future
clinical trials we may conduct, or changes in the development status of our product candidates;

our decision to initiate a preclinical study or clinical trial, not to initiate a preclinical study or clinical trial or to terminate an existing preclinical study or clinical
trial;

adverse results or delays in preclinical studies or clinical trials of our product candidates;

any delay in our regulatory filings for our product candidates and any adverse development or perceived adverse development with respect to the applicable
regulatory  authority’s  review  of  such  filings,  including,  without  limitation,  the  FDA’s  issuance  of  a  “refusal  to  file”  letter  or  a  request  for  additional
information;

our failure to commercialize our product candidates;

adverse regulatory decisions, including failure to receive regulatory approval of our product candidates;

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

adverse developments concerning our manufacturers or suppliers;

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

our inability to establish collaborations, if needed;

additions or departures of key scientific or management personnel;

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

introduction of new products or services offered by us or our competitors;

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

our ability to effectively manage our growth;

the size and growth of our initial target markets;

our ability to successfully treat additional types of B cell-mediated autoimmune diseases;

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actual or anticipated variations in annual or quarterly operating results;

our cash position;

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

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

changes in the market valuations of similar companies;

overall performance of the equity markets;

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

trading volume of our common stock;

changes in accounting practices;

ineffectiveness of our internal controls;

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

significant lawsuits, including patent or stockholder litigation;

general political and economic conditions;

global health concerns, such as the COVID-19 pandemic; and

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

In  addition,  the  stock  market  in  general,  and  The  Nasdaq  Global  Select  Market  and  biopharmaceutical  companies  in  particular,  have  experienced  extreme  price  and
volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect
the market price of our common stock, regardless of our actual operating performance. In the past, securities class action litigation has often been instituted against companies
following periods of volatility in the market price of a company’s securities. This type of litigation, if instituted, could result in substantial costs and a diversion of management’s
attention and resources, which would harm our business, operating results or financial condition.

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

We currently anticipate that we will retain future earnings for the development, operation and expansion of our business and do not anticipate declaring or paying any

cash dividends for the foreseeable future. Any return to stockholders will therefore be limited to the appreciation of their stock.

We  are  an  emerging  growth  company  and  a  “smaller  reporting  company,”  and  we  cannot  be  certain  if  the  reduced  reporting  requirements  applicable  to  emerging
growth companies and smaller reporting companies will make our common stock less attractive to investors.

We  are  an  emerging  growth  company,  as  defined  in  the  Jumpstart  Our  Business  Startups Act,  or  JOBS Act.  For  as  long  as  we  continue  to  be  an  emerging  growth
company,  we  may  take  advantage  of  exemptions  from  various  reporting  requirements  that  are  applicable  to  other  public  companies  that  are  not  emerging  growth  companies,
including  not  being  required  to  comply  with  the  auditor  attestation  requirements  of  Section  404  of  the  Sarbanes-Oxley Act  of  2002,  as  amended,  or  the  Sarbanes-Oxley Act,
reduced  disclosure  obligations  regarding  executive  compensation  in  our  periodic  reports  and  proxy  statements  and  exemptions  from  the  requirements  of  holding  nonbinding
advisory votes on executive compensation and stockholder approval of any golden parachute payments not previously approved. We could be an emerging growth company for up
to five years following the date of completion of our initial public offering, although circumstances could cause us to lose that status earlier. We will remain an emerging growth
company until the earlier of (1) the last day of the fiscal year (a) following the fifth

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anniversary of the completion of our initial public offering, (b) in which we have total annual gross revenue of at least $1.07 billion or (c) in which we are deemed to be a large
accelerated filer, which requires the market value of our common stock that is held by non-affiliates to exceed $700 million as of the prior June 30th, and (2) the date on which we
have issued more than $1 billion in non-convertible debt during the prior three-year period.

Under  the  JOBS Act,  emerging  growth  companies  can  also  delay  adopting  new  or  revised  accounting  standards  until  such  time  as  those  standards  apply  to  private
companies. We have elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private
companies until the earlier of the date we (i) are no longer an emerging growth company or (ii) affirmatively and irrevocably opt out of the extended transition period provided in
the JOBS Act. As a result, we are not subject to the same new or revised accounting standards as other public companies that are not emerging growth companies and our financial
statements may not be comparable to other public companies that comply with new or revised accounting pronouncements as of public company effective dates.

We are also a “smaller reporting company,” as defined in Rule 12b-2 under the Securities Exchange Act of 1934, as amended. We would cease to be a smaller reporting
company if we have a public float in excess of $250 million, or have annual revenues in excess of $100 million and a public float in excess of $700 million, determined on an
annual basis. Consequently, even after we no longer qualify as an emerging growth company, we may still qualify as a “smaller reporting company” which would allow us to take
advantage of many of the same exemptions from disclosure requirements including not being required to comply with the auditor attestation requirements of Section 404 of the
Sarbanes-Oxley Act and reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements. We cannot predict if investors will find our
common stock less attractive because we may rely on these exemptions. If some investors find our common stock less attractive as a result, there may be a less active trading
market for our common stock and our stock price may be more volatile.

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

We  may  seek  additional  capital  through  a  combination  of  public  and  private  equity  offerings,  debt  financings,  strategic  partnerships  and  alliances  and  licensing
arrangements. 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 may
include liquidation or other preferences that adversely affect your rights as a stockholder. The incurrence of indebtedness would result in increased fixed payment obligations and
could involve certain restrictive covenants, such as limitations on our ability to incur additional debt, limitations on our ability to acquire or license intellectual property rights and
other operating restrictions that could adversely impact our ability to conduct our business. If we raise additional funds through strategic partnerships and alliances and licensing
arrangements with third parties, we may have to relinquish valuable rights to our technologies or product candidates or grant licenses on terms unfavorable to us.

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

The trading market for our common stock depends in part on the research and reports that securities or industry analysts publish about us or our business. In the event that
one or more of the analysts who covers us downgrades our stock or publishes inaccurate or unfavorable research about our business, our stock price may decline. If one or more of
these analysts ceases coverage of our company or fails to publish reports on us regularly, demand for our stock could decrease, which might cause our stock price and trading
volume to decline.

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  Item 1B. Unresolved Staff Comments.

None.

  Item 2. Properties.

Our corporate headquarters are located in Philadelphia, PA, where we lease 7,672 square feet of office, research and development space subject to a lease agreement that
is in effect through 2022. We expect to expand to a new space in 2022 that will both be adequate for near-term needs in addition to providing additional space to grow. We feel that
suitable additional research and development, laboratory and manufacturing space should be available in the region on commercially reasonable terms.

  Item 3. Legal Proceedings.

From time to time, we may be involved in lawsuits, claims, investigations and proceedings, consisting of intellectual property, commercial, employment and other matters
which arise in the ordinary course of business. While the outcome of any such proceedings cannot be predicted with certainty, as of December 31, 2020, we were not party to any
legal proceedings that we would expect to have a material adverse impact on our financial position, results of operations or cash flow.

  Item 4. Mine Safety Disclosures.

Not applicable.

123

 
  PART II

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

Our  common  stock  trades  on  The  Nasdaq  Global  Select  Market  under  the  symbol  “CABA”.  Trading  of  our  common  stock  commenced  on  October  25,  2019,  in

connection with our initial public offering, or IPO. Prior to that time, there was no established public trading market for our common stock.

Stockholders

As of March 10, 2021, we had approximately 14 holders of record of our common stock. The actual number of holders of our common stock is greater than this number
of record holders and includes stockholders who are beneficial owners, but whose shares are held in street name by brokers or held by other nominees. The number of holders of
record also does not include stockholders whose shares may be held in trust by other entities.

Dividend Policy

We have never declared or paid any cash dividends on our common stock. We currently intend to retain all available funds and any future earnings, if any, to fund the
development and growth of our business. We do not expect to pay any cash dividends in the foreseeable future. Any future determination to pay dividends will be made at the
discretion of our board of directors and will depend on various factors, including applicable laws, our results of operations, financial condition, future prospects, then applicable
contractual restrictions and any other factors deemed relevant by our board of directors. Investors should not purchase our common stock with the expectation of receiving cash
dividends.

Equity Compensation Plan

The information required by Item 5 of Form 10-K regarding equity compensation plans is incorporated herein by reference to Item 12 of Part III of this Annual Report on

Form 10-K.

Issuer Purchases of Equity Securities

We did not purchase any of our equity securities during the period covered by this Annual Report on Form 10-K.

Recent Sales of Unregistered Securities

None.

Use of Proceeds from the Initial Public Offering

On October 29, 2019, we closed our initial public offering, or IPO, in which we issued and sold 7,275,501 shares of common stock at a public offering price of $11.00 per
share, including 475,501 shares of common stock at a price of $11.00 per share pursuant to the exercise of the underwriters’ over-allotment option. All of the shares of common
stock issued and sold in our initial public offering were registered under the Securities Act pursuant to a registration statement on Form S-1 (Registration No. 333-234017), which
was declared effective by the SEC on October 24, 2019. Morgan Stanley & Co. LLC, Cowen and Company and Evercore Group L.L.C. acted as joint book-running managers for
the offering.

The  aggregate  net  proceeds  to  us  from  the  public  offering,  inclusive  of  the  over-allotment  exercise,  were  approximately  $71.0  million,  after  deducting  underwriting
discounts and commissions and other offering expenses payable by us of approximately $3.4 million. No offering expenses were paid directly or indirectly to any of our directors
or officers (or their associates) or persons owning 10% or more of any class of our equity securities or to any other affiliates.

Information related to use of proceeds from registered securities is incorporated herein by reference to the “Use of Proceeds” section of the Company’s final prospectus

related to the IPO. The amounts and timing of our

124

 
actual  expenditures  may  vary  significantly  depending  on  numerous  factors,  including  the  progress  of  our  research  and  development,  the  status  of  and  results  from  non-
clinical studies or clinical trials we may commence in the future, as well as any collaborations that we may enter into with third parties for our product candidates or strategic
opportunities that become available to us, and any unforeseen cash needs. As a result, our management will retain broad discretion over the allocation of the net proceeds from this
offering. There has been no material change in the planned use of proceeds from our IPO as described in our final prospectus. As of December 31, 2020, we have not used any of
the net proceeds from our initial public offering.

125

 
 
  Item 6. Selected Financial Data.

Reserved.

126

 
 
  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  together  with  the  section  entitled  “Selected  Financial
Information” and our financial statements and related notes appearing elsewhere in this Annual Report on Form 10-K, or this Annual Report. Some of the information contained
in this discussion and analysis or set forth elsewhere in this Annual Report, including information with respect to our plans and strategy for our business and related financing,
includes forward-looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the section entitled “Risk Factors,” our
actual results could differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis. You should
carefully read the section entitled “Risk Factors” to gain an understanding of the important factors that could cause actual results to differ materially from our forward-looking
statements.  Please  also  see  the  section  entitled  “Special  Note  Regarding  Forward-Looking  Statements.”  We  do  not  assume  any  obligation  to  update  any  forward-looking
statements, whether as a result of new information, future events or otherwise, except as required by law.

Overview

We are a clinical-stage biotechnology company focused on the discovery and development of engineered T cell therapies, and exploring their potential to provide a deep
and durable, perhaps curative, treatment, for patients with B cell-mediated autoimmune diseases. Our proprietary technology utilizes Chimeric AutoAntibody Receptor, or CAAR,
T cells that are designed to selectively bind and eliminate only specific B cells that produce disease-causing autoantibodies, or pathogenic B cells, while sparing normal B cells.
Our lead CAAR T cell product candidate was designed based on the clinically validated and commercially approved Chimeric Antigen Receptor, or CAR, T cell technology that is
marketed for the treatment of B cell cancers. By harnessing the power of targeted cell therapy, we believe our CAAR T product candidates have the potential to provide responses
that may be a safer and more effective option than current treatments. We believe our technology, in combination with our proprietary  Cabaletta Approach  for  selective B  cell
Ablation platform, called our CABA platform, has applicability across over two dozen B cell-mediated autoimmune diseases that we have identified, evaluated and prioritized. In
order to accelerate product development for our lead program and to access a proven cell therapy manufacturing platform, we have entered into a collaboration with the University
of Pennsylvania, or Penn. We hold multiple agreements with Penn to develop CAAR T cell therapies for the treatment of these diseases. Our goal is to leverage our team’s expertise
in autoimmunity and engineered T cell therapy and our collaboration with Penn to rapidly discover and develop our portfolio of CAAR T product candidates. Our initial focus is
mucosal pemphigus vulgaris, or mPV, which is an autoimmune blistering disease. We submitted an Investigational New Drug, or IND, application for our lead product candidate,
DSG3-CAART, to the U.S. Food and Drug Administration, or the FDA, in August 2019 and our IND was cleared in September 2019. The FDA granted DSG3-CAART orphan
drug designation for the treatment of PV in January 2020, and fast track designation for improving healing of mucosal blisters in patients with mucosal pemphigus vulgaris, or
mPV, in May 2020. Our lead product candidate, DSG3-CAART, designed to treat patients with mPV, is currently enrolling patients for a Phase 1 trial, or the DesCAARTesTM trial.
In December 2020, we announced that the first patient had been dosed in the DesCAARTesTM trial. We expect to report the acute safety data from the first cohort of patients in the
DesCAARTesTM  trial  in  the  first  half  of  2021, with  additional  topline  data  from  any  completed  dose  cohorts  throughout  the  second  half  of  2021.  Our  lead  preclinical  product
candidate is designed for the treatment of muscle-specific kinase myasthenia gravis, or MuSK MG, and is currently in IND enabling studies, with an IND submission expected in
the second half of 2021. We are also advancing additional product candidates currently in discovery-stage or preclinical development for the treatment of mucocutaneous PV, or
mcPV, and Hemophilia A with Factor VIII, or FVIII, alloantibodies in addition to three undisclosed targets.

We  were  incorporated  in April  2017.  In August  2018,  we  entered  into  multiple  agreements  with  Penn  to  develop  the  CAAR  T  technology  to  treat  B  cell-mediated
autoimmune diseases. Our operations to date have been financed primarily by net proceeds of $86.4 million from the sale of convertible notes and convertible preferred stock and
net proceeds of $71.0 million from the sale of common stock in our initial public offering, or IPO, in October 2019. As of December 31, 2020, we had $108.7 million in cash and
cash equivalents and investments.

127

 
Amended and Restated License Agreement with the Trustees of the University of Pennsylvania and the Children’s Hospital of Philadelphia

In August  2018,  we  entered  into  a  license  agreement  with  Penn,  which  was  amended  and  restated  in  July  2019  to  include  the  Children’s  Hospital  of  Philadelphia,  or
CHOP, collectively, the Institutions, and collectively with such amendment, as amended in May 2020, the License Agreement, pursuant to which we obtained (a) a non-exclusive,
non-sublicensable, worldwide research license to make, have made and use products in two subfields of use, (b) effective as of October 2018, an exclusive, worldwide, royalty-
bearing license, with the right to sublicense, under certain of the Institutions’ intellectual property to make, use, sell, offer for sale and import products in the same two subfields of
use, and (c) effective as of October 2018, a non-exclusive, worldwide, royalty-bearing license, with limited rights to sublicense, under certain of Penn’s know-how to make, have
made, use, sell, offer for sale, import and have imported products in the same two subfields of use. Our rights are subject to the rights of the U.S. government and certain rights
retained by the Institutions.

Unless earlier terminated, the License Agreement expires on the expiration or abandonment or other termination of the last valid claim in Penn’s intellectual property
licensed by us. We may terminate the License Agreement at any time for convenience upon 60 days written notice. In the event of an uncured, material breach, Penn may terminate
the License Agreement upon 60 days written notice.

Sponsored Research Agreements

 We have two sponsored research agreements, or SRAs, with Penn for the laboratories of Drs. Payne and Milone,  who are also our scientific co-founders and members of
our scientific advisory board. In May 2020, the agreement with Dr. Payne, or the Payne SRA, was expanded to include CAAR design and optimization efforts in three additional B
cell-mediated autoimmune diseases. In August 2020, the Payne SRA was further amended to extend the term of the original research plan. Under the amended agreements, we are
committed to funding a defined research plan through February 2023. The total estimated cost of the agreements is $11.8 million, which satisfies the $2.0 million annual obligation
under the License Agreement. As of December 31, 2020, $7.1 million of cost has been incurred pursuant to these agreements.

Master Translational Research Services Agreement

In October 2018, we entered into a Master Translational Services Agreement with Penn, or the Services Agreement, pursuant to which Penn agreed to perform certain
services related to the research and development of the technology licensed to us under the License Agreement, as well as certain clinical, regulatory and manufacturing services.
 The Services Agreement will expire on the later of (i) October 19, 2021 or (ii) completion of the services for which we have engaged Penn under the Services Agreement. Either
party may terminate this agreement with or without cause upon a certain number of days’ prior written notice.  The services encompassed by the Services Agreement are performed
by  different  organizations  at  Penn  pursuant  to  certain  addenda  to  the  Services Agreement,  including  the  Center  for Advanced  Retinal  and  Ocular  Therapeutics,  or  CAROT,
Addendum, as amended in May 2020, and the CVPF Addendum.

Components of Operating Results

Revenue

To date, we have not generated any revenue from product sales and do not expect to generate any revenue from the sales of products for several years, if at all. If our
development efforts for our current or future product candidates are successful and result in marketing approval, we may generate revenue in the future from product sales. We
cannot predict if, when or to what extent we will generate revenue from the commercialization and sale of our product candidates. We may never succeed in obtaining regulatory
approval for any of our product candidates.

We may also in the future enter into license or collaboration agreements for our product candidates or intellectual property, and we may generate revenue in the future

from payments as a result of such license or collaboration agreements.

128

 
Operating Expenses

Research and Development

Our research and development expenses include:

•

•

•

•

•

•

•

personnel costs, which include salaries, benefits and stock-based compensation expense;

expenses incurred under agreements with consultants and third-party contract organizations that conduct research and development activities on our behalf;

costs related to sponsored research service agreements;

costs related to production of preclinical and clinical materials, including fees paid to contract manufacturers;

licensing fees for intellectual property and know-how;

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

laboratory supplies and equipment used for internal research and development activities and related depreciation expense.

We  have  not  reported  program  costs  since  inception  because  historically  we  have  not  tracked  or  recorded  our  research  and  development  expenses  on  a  pre-clinical
program-by-program basis. We use our personnel and infrastructure resources across the breadth of our research and development activities, which are directed toward identifying
and developing product candidates.

We expense all research and development costs in the periods in which they are incurred. Costs for certain research and development activities are recognized based on an

evaluation of the progress to completion of specific tasks using information and data provided to us by our vendors and third-party service providers.

We expect our research and development expenses to increase substantially for the foreseeable future as we continue to invest in research and development activities
related  to  developing  our  product  candidates,  including  investments  in  manufacturing,  as  our  programs  advance  and  we  conduct  clinical  trials.  The  process  of  conducting  the
necessary clinical research to obtain regulatory approval is costly and time-consuming, and the successful development of our product candidates is highly uncertain. 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.

Because  of  the  numerous  risks  and  uncertainties  associated  with  product  development,  we  cannot  determine  with  certainty  the  duration  and  completion  costs  of  the
current or future preclinical studies and clinical trials or if, when, or to what extent we will generate revenues from the commercialization and sale of our product candidates. We
may never succeed in achieving regulatory approval for our product candidates. The duration, costs and timing of preclinical studies and clinical trials and development of our
product candidates will depend on a variety of factors, including:

•

•

•

•

•

•

successful completion of preclinical studies and IND-enabling studies;

development of chemistry, manufacturing and controls, or CMC, processes and procedures for purposes of IND applications;

successful patient enrollment in, and the initiation and completion of, clinical trials;

the impact of any business interruptions to our operations, including the timing and enrollment of patients in our ongoing and planned clinical trials, or to those
of our clinical sites, manufacturers, suppliers, or other vendors resulting from the COVID-19 pandemic or similar public health crisis;

receipt of regulatory approvals from applicable regulatory authorities;

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

129

 
 
 
 
 
 
 
 
 
 
 
 
 
 
•

•

•

•

•

•

•

obtaining and maintaining patent and trade secret protection and non-patent exclusivity;

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

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

effectively competing with other therapies and treatment options;

a continued acceptable safety and efficacy profile following approval;

enforcing and defending intellectual property and proprietary rights and claims; and

achieving desirable medicinal properties for the intended indications.

We may never succeed in achieving regulatory approval for any of our product candidates. We may obtain unexpected results from our preclinical studies and clinical
trials. We may elect to discontinue, delay or modify clinical trials of some product candidates or focus on others. A change in the outcome of any of these factors could mean a
significant change in the costs and timing associated with the development of our current and future preclinical and clinical product candidates. For example, if the FDA or another
regulatory authority, were to require us to conduct clinical trials beyond those that we currently anticipate will be required for the completion of clinical development, or if we
experience  significant  delays  in  execution  of  or  enrollment  in  any  of  our  preclinical  studies  or  clinical  trials,  we  could  be  required  to  expend  significant  additional  financial
resources  and  time  on  the  completion  of  preclinical  and  clinical  development.  We  expect  our  research  and  development  expenses  to  increase  for  the  foreseeable  future  as  we
continue the development of product candidates.

General and Administrative Expenses

Our general and administrative expenses consist primarily of personnel costs, costs related to maintenance and filing of intellectual property, depreciation expense and
other  expenses  for  outside  professional  services,  including  legal,  human  resources,  audit  and  accounting  services.  Personnel  costs  consist  of  salaries,  benefits  and  stock-based
compensation expense. We expect our general and administrative expenses to increase over the next several years to support our continued research and development activities,
manufacturing  activities,  increased  costs  of  operating  as  a  public  company  and  the  potential  commercialization  of  our  product  candidates.  We  anticipate  our  general  and
administrative costs will increase with respect to the hiring of additional personnel, developing commercial infrastructure, fees to outside consultants, lawyers and accountants, and
increased  costs  associated  with  being  a  public  company  such  as  expenses  related  to  services  associated  with  maintaining  compliance  with  Nasdaq  listing  rules  and  SEC
requirements, insurance and investor relations costs.

Other Income

Other income consists of interest earned on our cash equivalents, amortization of bond discount or premium and investment gains and losses realized during the period.

130

 
 
 
 
 
 
 
 
 
Results of Operations for the years ended December 31, 2020 and 2019

The following sets forth our results of operations:

Statements of Operations Data:
Operating expenses:

Research and development
General and administrative

Total operating expenses
Loss from operations
Other income:

Interest income

Net loss

Research and Development Expenses

Year Ended December 31,

2020

2019
(in thousands)

Change

  $

  $

21,376     $
12,457    
33,833    
(33,833 )  

494    
(33,339 )   $

11,671     $
7,012    
18,683    
(18,683 )  

1,740    
(16,943 )   $

9,705  
5,445  
15,150  
(15,150 )

(1,246 )
(16,396 )

Research and development expenses were $21.4 million for the year ended December 31, 2020 as compared to $11.7 million for the year ended December 31, 2019. The

table below summarizes our research and development expenses:

Sponsored research activities
License of intellectual property and subscription fee
Manufacturing of preclinical and clinical supplies
Clinical trials
Personnel
Development services
Other

Year Ended December 31,

2020

2019
(in thousands)

Change

  $

  $

3,062     $
143    
4,652    
1,202    
7,827    
4,350    
140    
21,376     $

2,228     $
268    
2,382    
441    
4,006    
2,146    
200    
11,671     $

834  
(125 )
2,270  
761  
3,821  
2,204  
(60 )
9,705

Specific changes in our research and development expenses year over year include a:

•

•

•

•

•

•

$3.8 million increase in personnel costs primarily driven by an increase in headcount to support overall growth, including an increase of $0.7 million in stock-
based compensation expense;

$2.3 million increase in manufacturing costs primarily due to vector manufacturing and cell processing capabilities and related activities;

$2.2 million increase in costs under our development services from increased outsourced preclinical research activities and lab related expenses;

$0.8 million increase in costs under our sponsored research agreements primarily due to an expanded scope of research;

$0.8 million increase in clinical trial costs for the DesCAARTesTM trial, including outsourced costs and investigator payments to clinical trial sites; and

$0.2  million  decrease in  license  of  intellectual  property  and  subscription  fees  and  other  due  primarily  to  a  non-refundable  payment  made  to  Penn  under  a
Subscription and Technology Transfer Agreement in the third quarter of 2019.

131

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
   
 
   
 
 
     
   
   
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
General and Administrative Expenses

General and administrative expenses were $12.5 million for the year ended December 31, 2020 as compared to $7.0 million for the year ended December 31, 2019. The

increase of $5.5 million in our general and administrative expenses year over year includes:

•

•

•

$2.6  million  of  additional  personnel  costs primarily  driven  by  an  increase  in  headcount  to  support  overall  growth,  including  an  increase  of $1.4  million  in
stock-based compensation expense;

$1.9 million of increased insurance costs, primarily as a result of being a public company for a full year; and

$1.0  million  of  additional  services,  including  legal,  audit  and  accounting,  public  relations,  recruiting  and  other  consulting  fees  and  other  general  and
administrative expenses, primarily as a result of being a public company.

Other Income

Interest income has decreased $1.2 million for the year ended December 31, 2020 as compared to the year ended December 31, 2019 primarily as a result of a significant

decrease in interest rates beginning in March 2020.

132

 
 
 
 
Liquidity and Capital Resources

Since our inception in April 2017 through December 31, 2020, our operations have been financed by proceeds of $86.4 million from the sale of convertible notes and our
convertible preferred stock and proceeds of $71.0 million from the sale of common stock in our initial public offering. As of December 31, 2020, we had $108.7 million in cash,
cash equivalents and investments. Cash in excess of immediate requirements is invested in accordance with our investment policy, primarily with a view to liquidity and capital
preservation.

We have incurred losses since our inception and, as of December 31, 2020, we had an accumulated deficit of $66.3 million. Our primary use of cash is to fund operating
expenses, which consist primarily of research and development expenditures, and to a lesser extent, general and administrative 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 prepaid expenses and other current assets, accounts payable and accrued
expenses.

Any  product  candidates  we  may  develop  may  never  achieve  commercialization  and  we  anticipate  that  we  will  continue  to  incur  losses  for  the  foreseeable  future.  We
expect that our research and development expenses, general and administrative expenses, and capital expenditures will continue to increase. As a result, until such time, if ever, as
we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings, debt financings or other capital sources, including
potentially collaborations, licenses and other similar arrangements. Our primary uses of capital are, and we expect will continue to be, compensation and related expenses, third-
party clinical research, manufacturing and development services, costs relating to the build-out of our headquarters, laboratories and manufacturing facility, license payments or
milestone obligations that may arise, laboratory and related supplies, clinical costs, manufacturing costs, legal and other regulatory expenses and general overhead costs.

Based upon our current operating plan, we believe that our existing cash, cash equivalents and investments as of December 31, 2020 will enable us to fund our operating
expenses and capital expenditure requirements through at least the third quarter of 2022. We have based this estimate on assumptions that may prove to be wrong, and we could
utilize our available capital resources sooner than we currently expect. We will continue to require additional financing to advance our current product candidates through clinical
development, to develop, acquire or in-license other potential product candidates and to fund operations for the foreseeable future. We will continue to seek funds through equity
offerings, debt financings or other capital sources, including potentially collaborations, licenses and other similar arrangements. However, we may be unable to raise additional
funds or enter into such other arrangements when needed on favorable terms or at all. If we do raise additional capital through public or private equity offerings, the ownership
interest of our existing stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect our stockholders’ rights. If
we  raise  additional  capital  through  debt  financing,  we  may  be  subject  to  covenants  limiting  or  restricting  our  ability  to  take  specific  actions,  such  as  incurring  additional  debt,
making capital expenditures or declaring dividends. Any failure to raise capital as and when needed could have a negative impact on our financial condition and on our ability to
pursue our business plans and strategies. If we are unable to raise capital, we will need to delay, reduce or terminate planned activities to reduce costs.

At-The-Market Offering Sales Agreement

On November 10, 2020, we filed a registration statement on Form S-3 (File No. 333-250006) with the SEC, which was declared effective on November 18, 2020 (the
Shelf Registration Statement), in relation to the registration of common stock, preferred stock, debt securities, warrants and/or units of any combination thereof for the purposes of
selling,  from  time  to  time,  our  common  stock,  debt  securities  or  other  equity  securities  in  one  or  more  offerings.  We  also  simultaneously  entered  into  a  Sales Agreement  with
Cowen and Company, LLC, to provide for the offering, issuance and sale of up to an aggregate amount of $75.0 million of our common stock from time to time in “at-the-market”
offerings under the Shelf Registration Statement and subject to the limitations thereof. No shares have been sold pursuant to the Sales Agreement as of December 31, 2020.

133

 
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  scope,  progress,  results  and  costs  of  researching,  developing  and  manufacturing  our  lead  product  candidates  or  any  future  product  candidates,  and
conducting preclinical studies and clinical trials;

the timing of, and the costs involved in, obtaining regulatory approvals or clearances for our lead product candidates or any future product candidates;

the  impact  of  any  business  interruptions  to  our  operations  or  to  those  of  our  clinical  sites,  manufacturers,  suppliers,  or  other  vendors  resulting  from  the
coronavirus disease (COVID-19) outbreak or similar public health crisis;

the number and characteristics of any additional product candidates we develop or acquire;

the timing of any cash milestone payments if we successfully achieve certain predetermined milestones;

the  cost  of  manufacturing  our  lead  product  candidate  or  any  future  product  candidates  and  any  products  we  successfully  commercialize,  including  costs
associated with building-out our manufacturing capabilities;

our ability to establish and maintain strategic collaborations, licensing or other arrangements and the financial terms of any such agreements that we may enter
into;

the expenses needed to attract and retain skilled personnel;

the costs associated with being a public company; and

the timing, receipt and amount of sales of any future approved or cleared products, if any.

Further, our operating plans may change, and we may need additional funds to meet operational needs and capital requirements for clinical trials and other research and
development activities. We currently have no credit facility or committed sources of capital. Because of the numerous risks and uncertainties associated with the development and
commercialization  of  our  product  candidates,  we  are  unable  to  estimate  the  amounts  of  increased  capital  outlays  and  operating  expenditures  associated  with  our  current  and
anticipated product development programs.

Cash Flows

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

Net cash provided by (used in):

Operating activities
Investing activities
Financing activities

Net (decrease) increase in cash and cash equivalents

Year Ended December 31,

2020

2019

(in thousands)

(26,770 )  
(7,981 )  
(24 )  
(34,775 )  

$

$

(16,045 )
(693 )
119,925  
103,187

$

$

134

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
Operating Activities

During the year ended December 31, 2020, cash used in operating activities of $26.8 million was attributable to our net loss of $33.3 million, offset by the net change of
$1.6 million in our net operating assets and liabilities and non-cash charges of $4.9 million for stock-based compensation charges, amortization of premium on investments and
depreciation.

During the year ended December 31, 2019, cash used in operating activities of $16.0 million was attributable to our net loss of $16.9 million, increased by the net change

of $1.5 million in our net operating assets and liabilities and offset by non-cash charges of $2.4 million for stock-based compensation charges and depreciation.

Investing Activities

During the year ended December 31, 2020,  cash used in investing activities of $8.0 million was attributable to $11.1 million of purchases of investments and $0.6 million

of purchases of property and equipment, partially offset by proceeds of $3.7 million from maturities of investments.

During the year ended December 31, 2019, we used $0.7 million of cash and cash equivalents in investing activities consisting of purchases of property and equipment.

Financing Activities

During the year ended December 31, 2020, cash used in financing activities included $0.2 million in payments for common stock issuance costs from our IPO in October

2019, offset by $0.2 million in proceeds from stock option exercises and purchases of shares under the employee stock purchase plan.

During the year ended December 31, 2019, cash provided by financing activities of $119.9 million was attributable to $48.7 million of net proceeds upon the issuance of

Series B convertible preferred stock in January 2019 and $71.2 million of net proceeds from the issuance of common stock in our initial public offering in October 2019.

Contractual Obligations and Commitments

In February 2019, we entered into an operating lease agreement for office space in Philadelphia, Pennsylvania. The lease term commenced in May 2019 and will expire in

July 2022. The initial annual base rent was $0.3 million, and such amount will increase by 2% annually on each anniversary of the commencement date.

Our commitments include:

•

The  License  Agreement. Under  the  License Agreement,  we  are  required  to  make  milestone  payments  upon  successful  completion  of  certain  development,
regulatory and sales milestones on a product-by-product and geographical basis. The payment obligations under the License Agreement are contingent upon
future  events  such  as  our  achievement  of  specified  development,  regulatory  and  commercial  milestones  and  we  will  be  required  to  make  development
milestone payments and royalty payments in connection with the sale of products developed under the License Agreement. As of December 31, 2020, we are
unable to estimate the timing or likelihood of achieving the milestones or making future product sales. We were also obligated to pay $2.0 million annually for
three years beginning August 2018 for funding to the laboratories of Drs. Payne and Milone.

Under  the  License Agreement,  we  must  use  commercially  reasonable  efforts  to  develop  and  commercialize  a  product  in  each  subfield.  During  the  term  of  the
License Agreement until the first commercial sale of the first product, we are obligated to pay Penn a non-refundable, non-creditable annual license maintenance
fee of $10,000. We are required to pay certain milestone payments upon the achievement of specified clinical and commercial milestones. Milestone payments are
reduced by a certain percentage for the second product that achieves a milestone, by an additional percentage for the third product that achieves a milestone, and
so on, for each subsequent product that achieves a milestone. In the event that we are able to successfully develop and launch multiple products under the License
Agreement, total milestone payments could be approximately $21.0 million. Penn is also

135

 
 
eligible  to  receive  tiered  royalties  at  percentage  rates  in  the  low  single-digits,  subject  to  an  annual  minimum  royalty,  on  annual  worldwide  net  sales  of  any
products that are commercialized by us or our sublicensees that contain or incorporate, or are covered by, the intellectual property licensed by us. To the extent we
sublicense our license rights under the License Agreement, Penn would be eligible to receive tiered sublicense income at percentage rates in the mid-single to low
double-digits. We have also entered into a subscription and technology transfer agreement with Penn, pursuant to which we owed Penn an upfront subscription fee,
which  was  paid  in  2019,  and  a  nominal  non-refundable  royalty  on  net  sales  of  products,  a  portion  of  which  will  be  credited  toward  milestone  payments  and
royalties under this License Agreement. Technology transfer activities would be at our cost and subject to agreement as to the technology to be transferred.

•

•

•

•

Master Translational Research Services Agreement with Penn. Under the Services Agreement, we have contracted for additional research and development
services from various laboratories within Penn. The Services Agreement will expire upon completion of the services for which we have engaged Penn under
the  Services Agreement.  In  May  2020,  the  Company  amended  its Addendum  with  the  Center  for Advanced  Retinal  and  Ocular  Therapeutics  (CAROT)  to
expand access to vector manufacturing. The Company may incur additional expenses up to $1.4 million through the remaining term of the CAROT Amended
Addendum.

Sponsored  Research  Agreements. We  have  two  sponsored  research  agreements,  or  SRAs,  with  Penn  for  the  laboratories  of  our  scientific  co-founders
Drs.  Payne  and  Milone.  In  May  2020,  the  Payne  SRA  was  expanded to  include  CAAR  design  and  optimization  efforts  in  three  additional  B  cell-mediated
autoimmune diseases. In August 2020, this agreement was further amended to extend the term of the original research plan. Under the amended agreements,
we are committed to funding a defined research plan through February 2023. The total estimated cost of the agreements is $11.8 million, which satisfies the
$2.0 million annual obligation under the License Agreement. As of December 31, 2020, $7.1 million of cost has been incurred pursuant to these agreements.

Manufacturing agreements. In January 2021, we entered into a Development and Manufacturing Services Agreement (Wuxi Agreement) with WuXi Advanced
Therapies, Inc. (Wuxi) to serve as our cell processing manufacturing partner for the anticipated MuSK-CAART Phase 1 clinical trial. We have the right to
terminate  the  Wuxi Agreement  for  convenience  or  other  reasons  specified  in  the  Wuxi Agreement  upon  prior  written  notice.  If  we  terminate  the  Wuxi
Agreement, we will be obligated to pay an early termination fee of $1.5 million. In February 2021, we entered into a research service agreement with CHOP
for vector manufacturing, with a total cost of $0.7 million, expected to be incurred during 2021.

Other Purchase Commitments. In the normal course of business, we enter into various purchase commitments with third-party contract manufacturers for the
manufacture  and  processing  of  our  product  candidates  and  related  raw  materials,  contracts  with  contract  research  organizations  for  clinical  trials  and
agreements with vendors for other services and products for operating purposes. These agreements generally provide for termination or cancellation other than
for costs already incurred.

136

 
 
 
 
 
Off-Balance Sheet Arrangements

During the periods presented, we did not have, nor do we currently have, any off-balance sheet arrangements as defined under SEC rules.

Critical Accounting Policies and Significant Judgments and Estimates

Our  management’s  discussion  and  analysis  of  our  financial  condition  and  results  of  operations  is  based  on  our  financial  statements,  which  have  been  prepared  in
accordance with generally accepted accounting principles, or GAAP. The preparation of these 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 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.

While our significant accounting policies are described in more detail in Note 2 to our financial statements appearing elsewhere in this Annual Report, we believe that the

following accounting policies are those most critical to the judgments and estimates used in the preparation of our financial statements.

Research and Development Costs

We estimate costs of research and development activities conducted by service providers, which include activities under the License Agreement, the conduct of sponsored
research,  preclinical  studies  and  contract  manufacturing  activities.  We  record  the  estimated  costs  of  research  and  development  activities  based  upon  the  estimated  amount  of
services provided and include these costs in the accrued and other current liabilities or prepaid expenses on the balance sheets and within research and development expense on the
statements of operations.

We  estimate  these  costs  based  on  factors  such  as  estimates  of  the  work  completed  and  budget  provided  and  in  accordance  with  agreements  established  with  our
collaboration partners and third-party service providers. We make significant judgments and estimates in determining the accrued liabilities and prepaid expense balances in each
reporting period. As actual costs become known, we adjust our accrued liabilities or prepaid expenses. We have not experienced any material differences between accrued costs
and actual costs incurred since our inception.

Stock-based Compensation

We measure our stock-based awards granted to employees and non-employees and shares issued under our employee stock purchase plan based on the estimated fair
values of the awards on the respective grant dates. We use the Black-Scholes option-pricing model (Black-Scholes) to estimate the fair value of its stock-based awards and shares
purchased under the employee stock purchase plan. The Company recognizes compensation expense for time-based awards on a straight-line basis over the requisite service period,
which is generally the vesting period of the award. The Company accounts for forfeitures of stock option awards as they occur.

Black-Scholes requires the use of subjective assumptions to determine the fair value of stock-based awards.

These assumptions include:

Fair value of common stock—Prior to our IPO in October 2019, the fair value of our common stock underlying stock-based awards was estimated on each grant date by our
board  of  directors.  In  order  to  determine  the  fair  value  of  our  common  stock  underlying  stock-based  awards,  our  board  of  directors  considered,  among  other  things,  a
valuation of our common stock prepared by an unrelated third-party valuation firm in accordance with the guidance provided by the American Institute of Certified Public
Accountants Practice Guide, Valuation of Privately-Held-Company Equity Securities Issued as Compensation.

137

 
Expected term—The expected term represents the period that stock-based awards are expected to be outstanding. The expected term for option grants is determined using
the simplified method, which is the midpoint between the vesting period and the contractual term of the option.

Expected volatility—As a privately held company prior to our IPO in October 2019, we have a limited trading history for our common stock and, as such, the expected
volatility is estimated based on the average volatility for comparable publicly traded biotechnology companies over a period equal to the expected term of the stock-based
awards.  The  comparable  companies  were  chosen  based  on  their  similar  size,  stage  in  the  life  cycle  or  area  of  specialty.  We  will  continue  to  apply  this  process  until  a
sufficient amount of historical information regarding the volatility of our own stock price becomes available.

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 a stock-based award.

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.

We will continue to use judgment in evaluating the assumptions utilized for our stock-based compensation expense calculations on a prospective basis. In addition to the

assumptions used in Black-Scholes, the amount of stock-based compensation expense we recognize in our financial statements includes stock option forfeitures as they occur.  

Emerging Growth Company Status

We  are  an  emerging  growth  company,  as  defined  in  the  JOBS Act.  Under  the  JOBS Act,  emerging  growth  companies  can  delay  adopting  new  or  revised  accounting
standards  issued  subsequent  to  the  enactment  of  the  JOBS Act  until  such  time  as  those  standards  apply  to  private  companies.  Section  107  of  the  JOBS Act  provides  that  an
emerging growth company may take advantage of the extended transition period provided in Section 7(a)(2)(B) of the Securities Act of 1933 for complying with new or revised
accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. Section 107 of the JOBS Act provides that
we can elect to opt out of the extended transition period at any time, which election is irrevocable. We have elected to use this extended transition period for complying with new or
revised accounting standards that have different effective dates for public and private companies until the earlier of the date we (i) are no longer an emerging growth company or
(ii) affirmatively and irrevocably opt out of the extended transition period provided in the JOBS Act. As a result, our financial statements may not be comparable to companies that
comply with new or revised accounting pronouncements as of public company effective dates.

Subject to certain conditions, as an emerging growth company, we may rely on certain other exemptions and reduced reporting requirements, including without limitation
(i) providing an auditor’s attestation report on our system of internal controls over financial reporting pursuant to Section 404(b) of the Sarbanes-Oxley Act and (ii) complying with
any  requirement  that  may  be  adopted  by  the  Public  Company Accounting  Oversight  Board  regarding  mandatory  audit  firm  rotation  or  a  supplement  to  the  auditor’s  report
providing  additional  information  about  the  audit  and  the  consolidated  financial  statements,  known  as  the  auditor  discussion  and  analysis.  We  will  remain  an  emerging  growth
company until the earlier of (a) the last day of the fiscal year in which we have total annual gross revenue of $1.07 billion or more; (b) the last day of the fiscal year following the
fifth anniversary of the date of the completion of our initial public offering; (c) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous
three years; or (d) the date on which we are deemed to be a large accelerated filer under the rules of the SEC.

Recently Issued Accounting Pronouncements Not Yet Adopted

In February 2016, the Financial Accounting Standards Board, or the FASB, issued ASU 2016-02, Leases (Topic 842), with guidance regarding the accounting for and
disclosure of leases. The update requires lessees to recognize the liabilities related all leases, including operating leases, with a term greater than 12 months on the balance sheet.
This update also requires lessees and lessors to disclose key information about their leasing transactions. This guidance was effective for public companies for annual and interim
periods beginning after December 15, 2018. For all other entities, including Emerging Growth Companies, this standard is effective for annual reporting periods beginning after
December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. Early adoption is permitted. As an Emerging Growth Company, we will adopt
Topic 842

138

 
for our annual period ending December 31, 2021, and have not yet finalized  our  assessment  of  the  impact that ASU  2016-02  will  have  on  our  financial  statements  or  financial
statement disclosures.

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

We are exposed to market risks in the ordinary course of our business. These risks primarily include interest rate sensitivities. We held cash and cash equivalents and
investments of $108.7 million as of December 31, 2020. We generally hold our cash in interest-bearing money market treasury fund accounts and our investments are investment
grade  corporate  bonds  with high credit quality issuers. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of U.S.
interest rates. Due to the short-term maturities of our cash equivalents and the low risk profile of our investments, an immediate 100 basis point change in interest rates would not
have a material effect on the fair market value of our cash equivalents. Declines in interest rates, however, would reduce future investment income.

We do not have any foreign currency or derivative financial instruments. Inflation generally affects us by increasing our cost of labor and program costs. We do not

believe that inflation had a material effect on our results of operations during the years ended December 31, 2020 and 2019.

  Item 8. Financial Statements and Supplementary Data.

The financial statements required to be filed pursuant to this Item 8 are appended to this Annual Report. An index of those financial statements is found in Item 15.

 Item 9. Changes in and Disagreements w ith Accountants on Accounting and Financial Disclosure.

There has been no change of accountants nor any disagreements with accountants on any matter of accounting principles or practices of financial disclosure required to be

reported under this Item.

139

 
  Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

The  Company  has  established  disclosure  controls  and  procedures  (as  defined  in  Rules  13a-15(e)  and  15d-15(e)  under  the  Exchange  Act)  designed  to  ensure  that
information  required  to  be  disclosed  in  the  reports  that  the  Company  files  or  submits  under  the  Securities  Exchange Act  of  1934,  as  amended,  or  Exchange Act,  is  recorded,
processed, summarized and reported within the time periods specified in the SEC’s rules and forms and  is accumulated and communicated to management, including the principal
executive officer (our Chief Executive Officer) and principal financial officer (our Chief Financial Officer), to allow timely decisions regarding required disclosure. In addition, the
design of disclosure controls and procedures 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.

Our  management,  with  the  participation  of  our  Chief  Executive  Officer  and  Chief  Financial  Officer,  evaluated,  as  of  December  31,  2020,  the  effectiveness  of  our
disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act). 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 and management necessarily applies its judgment in evaluating the
cost-benefit  relationship  of  possible  controls  and  procedures.  Our  disclosure  controls  and  procedures  have  been  designed  to  provide  reasonable  assurance  of  achieving  their
objectives. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e)
and 15d-15(e) under the Exchange Act) were effective at the reasonable assurance level as of December 31, 2020

Management’s Annual Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is a process
designed to provide reasonable assurance of the reliability of financial reporting and of the preparation of financial statements for external reporting purposes, in accordance with
U.S. generally accepted accounting principles.

Internal control over financial reporting includes policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly
reflect  transactions  and  disposition  of  assets;  (2)  provide  reasonable  assurance  that  transactions  are  recorded  as  necessary  to  permit  preparation  of  financial  statements  in
accordance with U.S. generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with the authorization of its management and
directors; and (3) provide reasonable assurance regarding the prevention or timely detection of unauthorized acquisition, use, or disposition of our assets that could have a material
effect on its financial statements.

Because  of  its  inherent  limitations,  internal  control  over  financial  reporting  may  not  prevent  or  detect  misstatements.  Also,  projections  of  any  evaluation  of  the
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 and
procedures included in such controls may deteriorate.

Our management has assessed the effectiveness of our internal control over financial reporting as of December 31, 2020. In making this assessment, management used
the criteria established by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control - Integrated Framework (2013). These criteria are
in  the  areas  of  control  environment,  risk  assessment,  control  activities,  information  and  communication,  and  monitoring.  Management’s  assessment  included  extensive
documentation, evaluating and testing the design and operating effectiveness of its internal controls over financial reporting.

Based on management’s processes and assessment, as described above, management has concluded that,  as  of  December  31,  2020,  our  internal  control  over  financial

reporting was effective.

Attestation Report of the Registered Public Accounting Firm

This Annual Report on Form 10-K does not include an attestation report of our registered public accounting firm due to an exemption established by the JOBS Act for

“emerging growth companies.”

140

 
Changes in Internal Control over Financial Reporting

There was no change in our internal control over financial reporting (as defined in Rule 13a-15(f) of the Exchange Act) that  occurred  during  the  fiscal  quarter  ended
December 31, 2020 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting. As a result of the COVID-19 pandemic,
since March 2020, most of our employees have been working remotely. We have not identified any material changes in our internal control over financial reporting as a result of
these changes to the working environment. We are continually monitoring and assessing the COVID-19 situation to determine any potential impacts on the design and operating
effectiveness of our internal controls over financial reporting.

  Item 9B. Other Information.

None.

141

 
 
  Item 10. Directors, Executive Officers and Corporate Governance.

  PART III

Except as set forth below, the information required by this item is incorporated by reference from our definitive Proxy Statement to be filed with the SEC in connection

with our 2021 Annual Meeting of Stockholders within 120 days after the end of the fiscal year ended December 31, 2020.

We  have  adopted  a  Code  of  Business  Conduct  and  Ethics  that  applies  to  all  of  our  directors,  officers  and  employees,  including  our  principal  executive  officer  and

principal financial officer. The Code of Business Conduct and Ethics is posted on our website at http://investors.cabalettabio.com/corporate-governance/governance-highlights.

We intend to satisfy the disclosure requirement under Item 5.05 of Form 8-K regarding an amendment to, or waiver from, a provision of this Code of Business Conduct
and Ethics by posting such information on our website, at the address and location specified above and , to the extent required by the listing standards of The Nasdaq Global Select
Market, by filing a Current Report on Form 8-K with the SEC, disclosing such information.

  Item 11. Executive Compensation.

The  information  required  by  this  Item  11  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2021 Annual  Meeting  of

Stockholders within 120 days after the end of the fiscal year ended December 31, 2020 and is incorporated herein by reference.

  Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

The  information  required  by  this  Item  12  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2021 Annual  Meeting  of

Stockholders within 120 days after the end of the fiscal year ended December 31, 2020 and is incorporated herein by reference.

  Item 13. Certain Relationships and Related Transactions, and Director Independence.

The  information  required  by  this  Item  13  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2021 Annual  Meeting  of

Stockholders within 120 days after the end of the fiscal year ended December 31, 2020 and is incorporated herein by reference.

  Item 14. Principal Accounting Fees and Services.

The  information  required  by  this  Item  14  will  be  included  in  our  definitive  proxy  statement  to  be  filed  with  the  SEC  with  respect  to  our  2021 Annual  Meeting  of

Stockholders within 120 days after the end of the fiscal year ended December 31, 2020 and is incorporated herein by reference.

142

 
 
  Item 15. Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this Annual Report on Form 10-K:

(1) Financial Statements:

  PART IV

Report of Independent Registered Public Accounting Firm
Balance Sheets as of December 31, 2020 and 2019
Statements of Operations and Comprehensive Loss for the Years Ended December 31, 2020 and 2019
Statements of Convertible Preferred Stock and Stockholders’ (Deficit) Equity for the Years Ended December 31, 2020 and 2019
Statements of Cash Flows for the Years Ended December 31, 2020 and 2019
Notes to Financial Statements

(2) Financial Statement Schedules:

Page
F-2
F-3
F-4
F-5
F-6
F-7

All financial statement schedules have been omitted because they are not applicable, not required or the information required is shown in the financial statements or the

notes thereto.

(3)  Exhibits.  The  exhibits  required  by  Item  601  of  Regulation  S-K  and  Item  15(b)  of  this Annual  Report  on  Form  10-K  are  listed  in  the  Exhibit  Index  immediately

preceding the signature page of this Annual Report on Form 10-K. The exhibits listed in the Exhibit Index are incorporated by reference herein.

 Item 16. Form 10-K Summary

None.

143

 
 
 
 
 
 
 
 
 
 
 
 
 
 
INDEX TO FINANCIAL STATEMENTS

Report of Independent Registered Public Accounting Firm
Balance Sheets as of December 31, 2020 and 2019
Statements of Operations and Comprehensive Loss for the Years Ended December 31, 2020 and 2019
Statements of Convertible Preferred Stock and Stockholders’ (Deficit) Equity for the Years Ended    December 31, 2020 and 2019
Statements of Cash Flows for the Years Ended December 31, 2020 and 2019
Notes to Financial Statements

Page

F-2
F-3
F-4
F-5
F-6
F-7

F-1

 
 
 
 
 
 
 
 
 
 
 
 
 
  Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of Cabaletta Bio, Inc.

Opinion on the Financial Statements

We  have  audited  the  accompanying  balance  sheets  of  Cabaletta  Bio,  Inc.  (the  Company)  as  of  December  31,  2020  and  2019,  the  related  statements  of  operations  and
comprehensive loss, convertible preferred stock and stockholders’ (deficit) equity and cash flows for the years then ended, and the related notes (collectively referred to as the
“financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2020 and 2019, and
the results of its operations and its cash flows for the years then ended, in conformity with U.S. generally accepted accounting principles.

Basis for Opinion

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

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

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

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2018
Philadelphia, Pennsylvania
March 16, 2021

F-2

 
 
CABALETTA BIO, INC.
  Balance Sheets
(in thousands, except share and per share amounts)

Assets
Current assets:

Cash and cash equivalents
Short-term investments
Prepaid expenses and other current assets

Total current assets
Property, plant and equipment, net
Other assets
Total Assets
Liabilities and stockholders’ equity
Current liabilities:

Accounts payable
Accrued and other current liabilities

Total current liabilities

Commitments and contingencies (see Note 7)

Stockholders’ equity:
Preferred stock, $0.00001 par value: 10,000,000 shares authorized as of

December 31, 2020 and 2019, respectively; no shares issued or outstanding at December 31, 2020 and 2019,
respectively

Voting and non-voting common stock, $0.00001 par value: 150,000,000

(143,590,481 voting and 6,409,519 non-voting) shares authorized as of December 31, 2020 and 2019, respectively;
24,062,775 (19,387,160 voting and 4,675,615 non-voting) shares issued and outstanding as of December 31, 2020
and 24,034,022 (17,624,503 voting and 6,409,519 non-voting) issued and outstanding as of December 31, 2019,
respectively

Additional paid-in capital
Accumulated other comprehensive income
Accumulated deficit
Total stockholders’ equity
Total liabilities and stockholders’ equity

December 31,

2020

2019

101,429     $
7,233    
4,873    
113,535    
890    
299    
114,724     $

1,243     $
3,937    
5,180    

136,204  
—  
4,348  
140,552  
815  
101  
141,468  

920  
2,227  
3,147  

—    

—  

—    
175,836    
6    
(66,298 )  
109,544    
114,724     $

—  
171,280  
—  
(32,959 )
138,321  
141,468

  $

  $

  $

  $

The accompanying notes are an integral part of these financial statements.

F-3

 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
     
 
   
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CABALETTA BIO, INC.
  Statements of Operations and Comprehensive Loss
(in thousands, except share and per share amounts)

Operating expenses:

Research and development
General and administrative

Total operating expenses
Loss from operations
Other income:

Interest income

Net loss
Deemed dividend
Net loss attributable to common stockholders
Other comprehensive income:

Net unrealized gain on available-for-sale investments, net of tax

Net comprehensive loss
Net loss per voting and non-voting share, basic and diluted

Year Ended December 31,

2020

2019

$

$

$
$
$

21,376    
12,457    
33,833    
(33,833 )  

494    
(33,339 )  

—  

(33,339 )  

6    
(33,333 )  
(1.44 )  

$

$

$
$
$

11,671  
7,012  
18,683  
(18,683 )

1,740  
(16,943 )
(5,326 )
(22,269 )

—  
(22,269 )
(4.07 )

The accompanying notes are an integral part of these financial statements.

F-4

 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
   
 
 
 
     
 
   
 
 
 
 
 
 
 
CABALETTA BIO, INC.
  Statements of Convertible Preferred Stock and Stockholders’ (Deficit) Equity
(in thousands, except share and per share amounts)

Convertible Preferred Stock

Common Stock

Balance—December 31, 2018

Issuance of convertible preferred stock,
   net of issuance costs of $1,293
Issuance of common stock upon
completion of initial public offering, net of
issuance costs of $3,408
Issuance of common stock in conjunction
with exercise of stock options
Exchange of convertible preferred stock,
   including deemed dividend
Conversion of convertible preferred stock
into common stock on a 1.5 for 1 basis
Stock-based compensation
Net loss

Balance—December 31, 2019

Issuance of common stock in connection
with exercise of stock options
Issuance of common stock under employee
stock purchase plan
Net unrealized gains on available-for-sale
   securities
Stock-based compensation
Net loss

Balance—December 31, 2020

Shares
12,393,047  

  $

Amount

Shares

Amount

43,921  

3,848,320  

  $

6,963,788  

48,707  

—  

—  

—  

—  

—  

—  

5,326  

7,275,501  

5,667  

—  

(19,356,835 )  

—  
—  
—  

—  

—  

—  
—  
—  
—  

  $

  $

(97,954 )      
—  
—  
—  

12,904,534  
—  
—  
24,034,022  

  $

—  

—  

—  
—  
—  
—  

25,611  

3,142  

—  
—  
—  
 24,062,775  

  $

—  

—  

—  

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  
—  
—  

Additional
Paid-in Capital  
1,762  

  $

Accumulated Other
Comprehensive
Income

Accumulated
Deficit

  $

—  

  $

(12,452 )   $

Total
Stockholders’
(Deficit) Equity
(10,690

—  

71,020  

6  

(1,762 )  

97,954  
2,300  
—  
171,280  

  $

139  

29  

—  
4,388  
—  
175,836  

  $

  $

  $

—  

—  

—  

—  

—  
—  
—  
—  

—  

—  

6  
—  
—  
6  

—

71,020

—  

—  

—  

(3,564 )  

(5,326

—  
—  

  $

(16,943 )  
(32,959 )   $

—  

—  

—  
—  

  $

(33,339 )  
(66,298 )   $

97,954
2,300
(16,943
138,321

139

29

4,388
(33,339
109,544

The accompanying notes are an integral part of these financial statements.

F-5

 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
 
 
 
 
 
 
 
     
 
 
 
 
CABALETTA BIO, INC.
  Statements of Cash Flows
(in thousands)

Cash flows from operating activities:
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Stock-based compensation
Amortization of premium on investments
Depreciation

Changes in operating assets and liabilities:

Prepaid expenses and other current assets
Other assets
Accounts payable
Accrued and other current liabilities

Net cash used in operating activities

Cash flows from investing activities:
Purchases of property and equipment
Purchases of investments
Proceeds from maturities of investments

Net cash used in investing activities

Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs
Proceeds from issuance of convertible preferred stock
Issuance costs of convertible preferred stock
Proceeds from issuance of common stock in connection with
   the exercise of stock options
Proceeds from the issuance of common stock under employee
   stock purchase plan

Net cash (used in) provided by financing activities

Net (decrease) increase in cash and cash equivalents
Cash and cash equivalents—beginning of year
Cash and cash equivalents—end of year
Supplemental disclosures of non-cash investing and
financing activities:

Conversion of convertible preferred stock into common stock
Exchange of convertible preferred stock, including deemed dividend
Deferred offering costs in accounts payable and accrued and other current liabilities
Property and equipment purchases included in accounts payable

Year Ended December 31,

2020

2019

$

(33,339 )  

$

(16,943 )

4,388    
119    
354    

(524 )  
(198 )  
555    
1,875    
(26,770 )  

(635 )  
(11,097 )  
3,751    
(7,981 )  

(192 )  
—    
—    

139    

29    
(24 )  
(34,775 )  
136,204    
101,429    

—    
—    
—    
20    

$

$
$
$
$

2,300  
—  
104  

(3,372 )
(101 )
246  
1,721  
(16,045 )

(693 )
—  
—  
(693 )

71,212  
50,000  
(1,293 )

6  

—  
119,925  
103,187  
33,017  
136,204  

97,954  
10,090  
192  
226

$

$
$
$
$

The accompanying notes are an integral part of these financial statements.

F-6

 
 
 
 
 
 
 
 
 
 
 
 
 
     
   
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
 
CABALETTA BIO, INC.

  Notes to the Financial Statements
(in thousands, except share and per share amounts)

1. Basis of Presentation

Cabaletta Bio, Inc. (the Company or Cabaletta) was incorporated in April 2017 in the State of Delaware as Tycho Therapeutics, Inc. and, in August 2018, changed its
name  to  Cabaletta  Bio,  Inc.  The  Company  is  headquartered  in  Philadelphia,  Pennsylvania.  Cabaletta  is  a  clinical-stage  biotechnology  company  focused  on  the  discovery  and
development of engineered T cell therapies for B cell-mediated autoimmune diseases.

Principal  operations  commenced  in April  2018,  when  the  Company  executed  two  sponsored  research  agreements  with  the  Trustees  of  the  University  of  Pennsylvania

(Penn).

On October 16, 2019, the Company effected a 1-for-1.5 reverse split of the Company’s issued and outstanding shares of common stock, par value $0.00001 per share
(Common Stock). Upon the effectiveness of the reverse stock split: (i) all shares of outstanding Common Stock were adjusted; (ii) the conversion price of the Series A convertible
preferred  stock  (Series A  Preferred),  Series A-1  convertible  preferred  stock  (Series A-1  Preferred),  Series A-2  convertible  preferred  stock  (Series A-2  Preferred)  and  Series  B
convertible preferred stock (Series B Preferred; collectively, the Preferred Shares) was adjusted; (iii) the number of shares of Common Stock for which each outstanding option to
purchase  Common  Stock  is  exercisable  was  adjusted;  and  (iv)  the  exercise  price  of  each  outstanding  option  to  purchase  Common  Stock  was  adjusted. All  of  the  outstanding
Common Stock share numbers (including shares of Common Stock subject to the Company’s options and as converted for the outstanding convertible preferred stock shares),
share prices, exercise prices and per share amounts contained in the financial statements have been retroactively adjusted in the financial statements to reflect this reverse stock
split for all periods presented. The par value per share and the authorized number of shares of Common Stock and convertible preferred stock were not adjusted as a result of the
reverse stock split.

On  October  29,  2019,  the  Company  completed  its  initial  public  offering  (IPO)  of  6,800,000  shares  of  Common  Stock  at  an  offering  price  of  $11.00  per  share.  The
Company  received  net  proceeds  of  $66,156  after  deducting  underwriting  discounts,  commissions  and  estimated  offering  expenses.  In  connection  with  the  IPO,  the  Company’s
outstanding shares of convertible preferred stock were automatically converted into 12,904,534 shares of Common Stock. In November 2019, the underwriters partially exercised
their  option  and  purchased  an  additional  475,501  shares  of  Common  Stock  resulting  in  net  proceeds  to  the  Company  of  $4,864,  after  deducting  underwriting  discounts  and
commissions.

Risks and Uncertainties

The Company does not expect to generate revenue from sales of engineered T cell therapies for B cell-mediated autoimmune diseases or any other revenue unless and
until the Company completes preclinical and clinical development and obtains regulatory approval for one or more product candidates. If the Company seeks to obtain regulatory
approval for any of its product candidates, the Company expects to incur significant commercialization expenses.

The  Company  is  subject  to  risks  common  to  companies  in  the  biotechnology  industry  including,  but  not  limited  to,  new  technological  innovations,  protection  of
proprietary technology, dependence on key personnel, compliance with government regulations and the need to obtain additional financing. As a result, the Company is unable to
predict the timing or amount of increased expenses or when or if the Company will be able to achieve or maintain profitability. Further, the Company is currently dependent on
University of Pennsylvania (Penn) for much of its preclinical research, clinical research and development activities and initial manufacturing activities (Note 6). Product candidates
currently under development will require significant additional research and development efforts, including extensive preclinical and clinical testing and regulatory approval, prior
to commercialization. Even if the Company is able to generate revenues from the sale of its product candidates, if approved, it may not become profitable. If the Company fails to
become profitable or is unable to sustain profitability on a continuing basis, then it may be unable to continue its operations at planned levels and be forced to reduce its operations.

 In  December  2019,  a  novel  strain  of  coronavirus  surfaced  in  Wuhan,  China  and  has  since  reached  multiple  other  regions  and  countries.  The  COVID-19  pandemic  is
evolving, and to date has led to the implementation of various responses, including government-imposed quarantines, travel restrictions and other public health safety measures,
which have delayed  the commencement of non-COVID-19-related clinical trials, among other

F-7

 
restrictions.  The Company’s financial  results  for  the year  ended December 31, 2020  were  not  significantly  impacted  by  COVID-19, however, the  Company  cannot  at  this  time
predict the specific extent, duration, or full impact that the COVID-19 pandemic, including new information that may emerge concerning the severity of COVID-19, the impact of
new strains of the virus, the effectiveness and availability of vaccines and the actions to contain COVID-19 or treat its impact will have on its financial condition, operations, and
business plans, including its ability to raise additional capital, the timing and enrollment of patients in its ongoing and planned clinical trials, future financings and other expected
milestones of its product candidates.

Liquidity

The  Company  has  sustained  annual  operating  losses  since  inception  and  expects  to  continue  to  generate  operating  losses  for  the  foreseeable  future.  The  Company’s
ultimate success depends on the outcome of its research and development activities. The Company had cash and cash equivalents and investments of $108,662 as of December 31,
2020. Through December 31, 2020, the Company has incurred an accumulated deficit of $66,298. Management expects to incur additional losses in the future as it continues its
research and development and will need to raise additional capital to fully implement its business plan and to fund its operations.

The Company intends to raise such additional capital through a combination of equity offerings, debt financings, government funding arrangements, strategic alliances or
other sources. However, if such financing is not available at adequate levels and on a timely basis, or such agreements are not available on favorable terms, or at all, as and when
needed, the Company will need to reevaluate its operating plan and may be required to delay or discontinue the development of one or more of its product candidates or operational
initiatives. The Company expects that its cash, cash equivalents and investments as of December 31, 2020 will be sufficient to fund its projected operations for at least 12 months
from the date the Company’s Annual Report on Form 10-K is filed with the Securities and Exchange Commission (SEC).

2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (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 financial statements
and the reported amounts of expenses during the reporting period. Significant estimates and assumptions made in the accompanying financial statements include but are not limited
to  the  fair  value  of  common  stock,  stock-based  compensation  and  the  valuation  allowance  on  the  Company’s  deferred  tax  assets.  The  Company  evaluates  its  estimates  and
assumptions on an ongoing basis using historical experience and other factors and adjusts those estimates and assumptions when facts and circumstances dictate. Actual results
could differ from those estimates.

Off-Balance Sheet Risk and Concentrations of Credit Risk

Financial  instruments,  which  potentially  subject  the  Company  to  significant  concentrations  of  credit  risk,  consist  primarily  of  cash  and  cash  equivalents,  which  are
primarily  invested  in  U.S.  treasury-based  money  market  funds,  and  available-for-sale  debt  securities,  which  are  invested  in  investment  grade  corporate  bonds  with high  credit
quality issuers. These investments have maturities in 2021. A portion of the Company’s cash is maintained at a federally insured financial institution. The deposits held at this
institution are in excess of federally insured limits. The Company has not experienced any losses in such accounts and management believes that the Company is not exposed to
significant credit risk due to the financial position of the depository institution in which those deposits are held.  The cash in this account is swept daily into U.S. treasury-based and
U.S.  government-based  money  market  funds.  The  Company  has  no  off‑balance  sheet  risk,  such  as  foreign  exchange  contracts,  option  contracts,  or  other  foreign  hedging
arrangements.

F-8

 
Cash and Cash Equivalents

The  Company  considers  all  highly  liquid  investments  purchased  with  original  maturities  of  three  months  or  less  from  the  purchase  date  to  be  cash  equivalents.  Cash

equivalents consist primarily of amounts invested in money market accounts.

Investments

Investments  are  available-for-sale  and  carried  at  estimated  fair  value.  The  Company’s  valuations  of  available-for-sale  debt  securities  are  generally  derived  from
independent pricing services based upon quoted prices in active markets for similar securities, with prices adjusted for yield and number of days to maturity, or based on industry
models using data inputs, such as interest rates and prices that can be directly observed or corroborated in active markets. Management determines the appropriate classification of
its investments in debt securities at the time of purchase and at the end of each reporting period. Investments with original maturities beyond three months at the date of purchase
and which mature at, or less than, twelve months from the balance sheet date are classified as current.

Unrealized gains and losses are excluded from earnings and are reported as a component of comprehensive income. The Company periodically evaluates whether declines
in fair values of its available-for-sale securities below their book value are other-than-temporary. This evaluation consists of several qualitative and quantitative factors including
the severity and duration of the unrealized loss as well as the Company’s ability and intent to hold the available-for-sale security until a forecasted recovery occurs. Additionally,
the Company assesses whether it has plans to sell the security or if more likely than not it will be required to sell any available-for-sale securities before recovery of its amortized
cost basis. 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  investments  sold  is  based  on  the  specific-identification  method.  Interest  income  on  investments  as  well  as  amortization  of  discount  or  premium  is  included  in
interest income.

Property, Plant and Equipment

Property,  plant  and  equipment  are  recorded  at  cost  less  accumulated  depreciation.  Cost  includes  the  acquisition  costs  and  all  costs  necessary  to  bring  the  asset  to  the
location and working condition necessary for its intended use. Depreciation expense is recognized using the straight-line method over the estimated useful life of each asset. Upon
retirement  or  sale,  the  cost  of  assets  disposed  of  and  the  related  accumulated  depreciation  are  removed  from  the  accounts  and  any  resulting  gain  or  loss  is  included  in  the
accompanying  statements  of  operations.  Expenditures  for  normal,  recurring  or  periodic  repairs  and  maintenance  related  to  property  and  equipment  are  charged  to  expense  as
incurred. The cost for planned major maintenance activities, including the related acquisition or construction of assets, is capitalized if it will result in future economic benefits.

Estimated useful lives for property and equipment are as follows:

Property and equipment
Laboratory equipment
Furniture and fixtures
Computer equipment
Leasehold improvements

Estimated useful life

Three years
Three years
Three years
Lesser of estimated useful life or remaining lease term

F-9

 
 
 
  
 
 
 
 
 
 
 
Fair Value Measurement

Assets and liabilities recorded at fair value on a recurring basis in the 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. Valuation techniques used to measure fair value
must maximize the use of observable inputs and minimize the use of unobservable inputs. The authoritative guidance on fair value measurements establishes a three-tier fair value
hierarchy for disclosure of fair value measurements as follows:

Level 1—Observable inputs such as unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2—Inputs (other than quoted prices included in Level 1) that are either directly or indirectly observable for the asset or  liability.  These  include  quoted  prices  for
similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Research and Development Expenses

Research and development costs include costs incurred for internal and external research and development activities and are expensed as incurred in the accompanying
statements  of  operations.  Research  and  development  costs  consist  of  salaries  and  benefits,  including  associated  stock-based  compensation,  and  laboratory  supplies  and  facility
costs, as well as fees paid to entities that conduct certain research and development activities on the Company’s behalf.

The  Company  records  accrued  liabilities  for  estimated  costs  of  research  and  development  activities  conducted  by  service  providers,  which  include  activities  under
agreements with Penn (Note 6), the conduct of sponsored research, preclinical studies and contract manufacturing activities. The Company records the estimated costs of research
and development activities based upon the estimated amount of services provided and includes these costs in accrued and other current liabilities and prepaid expenses and other
current assets in the accompanying balance sheets and within research and development expense in the accompanying statements of operations. Non-refundable advance payments
made for goods or services that will be used or rendered for future research and development activities are deferred and capitalized and recognized as expense as the goods are
received or the related services are rendered.

The Company accrues for these costs based on factors such as estimates of the work completed and in accordance with agreements established with service providers. The
Company  makes  significant  judgments  and  estimates  in  determining  the  accrued  liabilities  and  prepaid  expenses  in  each  reporting  period. As  actual  costs  become  known,  the
Company adjusts its accrued liabilities and prepaid expenses. The Company has not experienced any material differences between accrued costs and actual costs incurred since its
inception.

F-10

 
 
Stock-based Compensation

The Company measures its stock-based awards granted to employees and non-employees based on the estimated fair values of the awards on the respective grant dates.
The Company uses the Black-Scholes option-pricing model (Black-Scholes) to estimate the fair value of its stock-based awards. The Company recognizes compensation expense
for time-based awards on a straight-line basis over the requisite service period, which is generally the vesting period of the award. The Company accounts for forfeitures of stock
option awards as they occur.

Prior to the Company’s IPO, the assumptions used in the Company's Black-Scholes option-pricing model represented management's best estimates and involve a number

of variables, uncertainties and assumptions and the application of management's judgment, as they are inherently subjective.

Income Taxes

The  Company  uses  the  asset  and  liability  method  of  accounting  for  income  taxes.  Deferred  tax  assets  and  liabilities  are  recognized  for  the  estimated  future  tax
consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax base. Deferred tax
assets and liabilities, which relate primarily to the carrying amount of the Company’s property and equipment and its net operating loss carryforwards, are measured using enacted
tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Deferred tax expense or benefit is the result
of changes in the deferred tax assets and liabilities. Valuation allowances are established when necessary to reduce deferred tax assets where, based upon the available evidence,
the  Company  concludes  that  it  is  more-likely-than-not  that  the  deferred  tax  assets  will  not  be  realized.  In  evaluating  its  ability  to  recover  deferred  tax  assets,  the  Company
considers all available positive and negative evidence, including its operating results, ongoing tax planning and forecasts of future taxable income on a jurisdiction-by-jurisdiction
basis. Because of the uncertainty of the realization of deferred tax assets, the Company has recorded a full valuation allowance against its deferred tax assets.

Reserves are provided for tax benefits for which realization is uncertain. Such benefits are only recognized when the underlying tax position is considered more-likely-
than-not  to  be  sustained  on  examination  by  a  taxing  authority,  assuming  they  possess  full  knowledge  of  the  position  and  facts.  Interest  and  penalties  related  to  uncertain  tax
positions are recognized in the provision of income taxes; however, the Company currently has no interest or penalties related to uncertain income tax benefits.

Net Loss Per Share

The  Company  calculates  basic  and  diluted  net  loss  per  share  attributable  to  common  stockholders  in  conformity  with  the  two-class  method  required  for  participating
securities. The Company has voting and non-voting common stock. The rights, including the liquidation and dividend rights, of the holders of the voting and non-voting common
stock are identical, except with respect to voting. Each share of non-voting common stock may be converted at any time into one share of voting common stock at the option of its
holder by providing written notice to the Company, subject to the limitations provided for in the amended and restated certificate of incorporation. The Company also considers its
unvested shares of common stock held by the Company’s founders and, prior to its conversion to common stock, its convertible preferred stock to be participating securities as, in
the event a dividend is paid on common stock, the holders of convertible preferred stock and unvested shares of common stock would be entitled to receive dividends on a basis
consistent with the common stockholders.

F-11

 
Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted average number of
shares of common stock, which excludes unvested shares of common stock. The undistributed loss for each year is allocated to common stockholders based on the contractual
participation  rights  of  the  voting  and  non-voting  common  stock  as  if  the  losses  for  the  year  had  been  distributed.  As  the  liquidation  and  dividend  rights  are  identical,  the
undistributed losses are allocated on a proportionate basis. Net loss attributable to common stockholders for the year ended December 31, 2019 is calculated by adjusting the net
loss  of  the  Company  for  the  deemed  dividend  associated  with  the  exchange  of  Series A-2  Preferred  for  Series  B  Preferred. Diluted  net  loss  per  share  attributable  to  common
stockholders is computed under the if-converted method and assumes that all non-voting common stock has been converted to common stock. Since the Company was in a loss
position for all periods presented, the effects of the other potentially dilutive securities are antidilutive.

Segments

Operating segments are defined as components of an entity for which separate financial information is available and that is regularly reviewed by the Chief Operating
Decision Maker (CODM) in deciding how to allocate resources to an individual segment and in assessing performance. The Company’s CODM is its Chief Executive Officer. The
Company has determined it operates in a single operating segment and has one reportable segment.

Related Party Transactions

The Company engaged a firm controlled by a former executive (until February 2019) of the Company for professional services related to accounting, finance and other
administrative functions. For the years ended December 31, 2020 and 2019, the costs incurred under this arrangement totaled $311 and $601, respectively. These amounts were
recorded as general and administrative expense in the accompanying statements of operations. As of December 31, 2020 and 2019, amounts owed under this arrangement totaled
$13 and $36, respectively, and are included in accounts payable in the accompanying balance sheets.

Emerging Growth Company Status

The Company is an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012 (the JOBS Act). Under the JOBS Act, emerging growth
companies  can  delay  adopting  new  or  revised  accounting  standards  issued  subsequent  to  the  enactment  of  the  JOBS Act,  until  such  time  as  those  standards  apply  to  private
companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public
and private companies until the earlier of the date that it (i) is no longer an emerging growth company or (ii) affirmatively and irrevocably opts out of the extended transition period
provided  in  the  JOBS Act. As  a  result,  these  financial  statements  may  not  be  comparable  to  companies  that  comply  with  the  new  or  revised  accounting  pronouncements  as  of
public company effective dates.

Recently Issued Accounting Pronouncements Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (FASB) issued ASU 2016-02, Leases (Topic 842), with guidance regarding the accounting for and disclosure
of leases. The update requires lessees to recognize the liabilities related all leases, including operating leases, with a term greater than 12 months on the balance sheet. This update
also requires lessees and lessors to disclose key information about their leasing transactions. This guidance will be effective for public companies for annual and interim periods
beginning  after  December  15,  2018.  For  all  other  entities,  including  Emerging  Growth  Companies,  this  standard  is  effective  for  annual  reporting  periods  beginning  after
December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. Early adoption is permitted. As an Emerging Growth Company, the Company
expects to adopt Topic 842 for its annual period ending December 31, 2021 and has not yet finalized the assessment of the impact that ASU 2016-02 will have on its financial
statements or financial statement disclosures.

F-12

 
3. Fair Value Measurements

As of December 31, 2020 and 2019, the Company’s financial instruments included cash and cash equivalents, available-for-sale debt securities, accounts payable and
accrued  expenses.  The  carrying  amounts  for  cash  and  cash  equivalents,  accounts  payable  and  accrued  expenses  reported  in  the  Company’s  financial  statements  for  these
instruments approximate their respective fair values because of the short-term nature of these instruments.

The following tables present information about the Company’s financial assets measured at fair value on a recurring basis and indicate the level of the fair value hierarchy

utilized to determine such fair values:

Financial assets
Cash and cash equivalents:
Money market funds
Short-term investments:
Corporate bonds

Total

Financial assets
Cash equivalents:

Money market funds

Total

December 31, 2020

Quoted
Prices in
Active Markets
for Identical
Assets (Level 1)

Significant
Other
Observable
Inputs
(Level 2)

Total

Significant
Unobservable
Inputs
(Level 3)

$

$

$
$

101,429    

$

101,429    

$

—    

$

7,233    
108,662    

$

—    
101,429    

$

7,233    
7,233    

$

—  

—  
—

December 31, 2019

Quoted Prices in Active
Markets for Identical
Assets (Level 1)

Significant Other
Observable Inputs (Level
2)

Total

Significant Unobservable
Inputs (Level 3)

136,204    
136,204    

$
$

136,204    
136,204    

$
$

—  
—    

  $
$

—  
—

Money market funds are measured at fair value on a recurring basis using quoted prices and are classified as Level 1. Investments are measured at fair value based on
inputs  other  than  quoted  prices  that  are  derived  from  observable  market  data  and  are  classified  as  Level  2  inputs.  There  were  no  transfers  of  assets  between  the  fair  value
measurement levels during the years ended December 31, 2020 or 2019.

For  debt  securities  classified  as  available-for-sale  investments,  the  Company  records  unrealized  gains  or  losses  resulting  from  changes  in  fair  value  between

measurement dates as a component of other comprehensive income. The Company did not hold any available-for-sale securities as of December 31, 2019.

Financial assets
Money market funds

Included in cash and cash equivalents
Corporate bonds - due in one year or less
Included in short-term investments

Total

Amortized Cost

Gross Unrealized
Gains

Gross Unrealized
Losses

Fair value

December 31, 2020

  $

  $

101,429     $

7,227    
108,656     $

—     $

6    
6     $

—     $

101,429  

—    
—     $

7,233  
108,662

F-13

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
     
 
     
 
   
 
 
     
 
     
 
     
 
   
 
 
 
     
 
     
 
     
 
   
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
     
 
     
 
     
 
   
 
 
     
 
     
 
   
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
     
 
     
 
   
 
 
     
 
     
 
     
 
   
 
 
     
 
     
 
     
 
   
 
 
 
 
 
 
4. Property, Plant and Equipment

Property plant and equipment consists of the following:

Laboratory equipment
Furniture and fixtures
Leasehold improvements
Computer equipment

Total property, plant and equipment

Less: accumulated depreciation

Property, plant and equipment, net

Depreciation expense was $354 and $104 for the years ended December 31, 2020 and 2019, respectively.

5. Accrued and Other Current Liabilities

Accrued and other current liabilities consist of the following:

Research and development services
General and administrative services
Compensation expense
Other

6. Collaborations, Licensing Agreements and other Agreements

December 31,

2020

2019

961     $
277    
57    
53    
1,348    
(458 )  
890     $

December 31,

2020

2019

1,294     $
160    
2,445    
38    
3,937     $

544  
277  
57  
41  
919  
(104 )
815

231  
297  
1,522  
177  
2,227

  $

  $

  $

  $

Amended and Restated License Agreement with the Trustees of the University of Pennsylvania and Children’s Hospital of Philadelphia

In August 2018, the Company entered into a license agreement with Penn, as amended and restated in July 2019 to include CHOP as a party, and as amended in May
2020  (the  License Agreement)  pursuant  to  which  the  Company  obtained  (a)  a  non-exclusive,  non-sublicensable  worldwide  license  to  certain  of  Penn’s  intellectual  property  to
conduct research, product development, clinical trials, cell manufacturing and other activities, and (b) an exclusive, worldwide, royalty-bearing right and license, with a right to
sublicense, on a target-by-target basis, under certain of Penn’s intellectual property to make, use, sell, offer for sale, import, and otherwise commercialize products for the treatment
of autoimmune and alloimmune diseases.

 Unless earlier terminated, the License Agreement expires on the expiration or abandonment or other termination of the last valid claim in Penn’s intellectual property
licensed  by  the  Company.  The  Company  may  terminate  the  License Agreement  at  any  time  for  convenience  upon  60  days  written  notice.  In  the  event  of  an  uncured,  material
breach, Penn may terminate the License Agreement upon 60 days written notice.

Under the terms of the License Agreement, the Company was obligated to pay $2,000 annually for three years beginning August 2018 for funding to the laboratories of
each of Drs. Milone and Payne (see Sponsored Research Agreements). During the term of the License Agreement until the first commercial sale of the first product, the Company
is  obligated  to  pay  Penn  a  non-refundable,  non-creditable  annual  license  maintenance  fee  of  $10.  In  May  2020,  the  Company  paid  Penn  an  additional,  non-refundable,  non-
creditable license fee of $33 under the amended License Agreement.

F-14

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The Company is required to pay certain milestone payments upon the achievement of specified clinical and commercial milestones. Milestone payments are reduced by
a certain percentage for the second product that achieves a milestone, by an additional percentage for the third product that achieves a milestone, and so on, for each subsequent
product  that  achieves  a  milestone.  In  the  event  that  the  Company  is  able  to  successfully  develop  and  launch  multiple  products  under  the License Agreement,  total  milestone
payments could be approximately $21,000. Penn is also eligible to receive tiered royalties at percentage rates in the low single-digits, subject to an annual minimum royalty, on
annual worldwide net sales of any products that are commercialized by the Company or its sublicensees that contain or incorporate, or are covered by, the intellectual property
licensed by the Company. To the extent the Company sublicenses its license rights under the  License Agreement, Penn would be eligible to receive tiered sublicense income at
percentage rates in the mid-single to low double-digits. There were no amounts due under the License Agreement as of December 31, 2020.

     Sponsored Research Agreements

The  Company  has  sponsored  research  agreements  with  two  faculty  members  at  Penn,  who  are  also  scientific  co-founders  of  the  Company  and  members  of  the
Company’s scientific advisory board. In May 2020, one of the agreements was amended to expand the scope of sponsored research. In August 2020, this agreement was further
amended to extend the term of the original research plan.

Under the amended agreements, the Company has committed to funding a defined research plan through February 2023. The total estimated cost of $11,781 under the
agreements  satisfies  the  Company’s  annual  obligation  under  the  License  Agreement  (see  Amended  and  Restated  License  Agreement  with  the  Trustees  of  the  University  of
Pennsylvania above). As of December 31, 2020, $7,090 of cost has been incurred pursuant to these agreements. For the years ended December 31, 2020 and 2019, the Company
recognized research and development expense of $2,995 and $2,137, respectively, related to these agreements in the accompanying statements of operations. As of December 31,
2020 and 2019, $1,851 and $1,588 respectively, of advance payments are included in Prepaid expenses and other current assets in the accompanying balance sheets  and there was
$217 included in Accrued and other current liabilities in the accompanying balance sheets as of December 31, 2020.

Master Translational Research Services Agreement

In  October  2018,  the  Company  entered  into  a  services  agreement  (the  Services Agreement)  with  Penn  for  additional  research  and  development  services  from  various
laboratories within Penn. The research and development activities are detailed in separately executed Penn organization-specific addenda. In May 2020, the Company amended its
Addendum with the Center for Advanced Retinal and Ocular Therapeutics (CAROT) to expand access to vector manufacturing.

Research and development expense related to executed addenda under the master translational research service agreement with Penn recognized in the accompanying
statements of operations for the years ended December 31, 2020 and 2019 was $2,474 and $2,355, respectively. The Company may incur additional expenses up to $1,360 through
the remaining term of the CAROT Amended Addendum.

Subscription and Technology Transfer Agreement

In July 2019, the Company entered into a subscription and technology transfer agreement pursuant to which the Company owed Penn an upfront subscription fee, which
was paid in 2019, and a nominal non-refundable royalty on the net sales of products, a portion of which will be credited toward milestone payments and royalties, respectively,
under the Amended License Agreement. Technology transfer activities will be at the Company’s cost and subject to agreement as to the technology to be transferred. Under this
agreement, the Company recognized $250 of research and development expense for the year ended December 31, 2019. No expense was recognized under this agreement for the
year ended December 31, 2020.

Collaboration and License Agreement

In July 2020, the Company entered into a collaboration and license agreement with Artisan Bio, Inc. (Artisan), wherein the Company and Artisan agreed to collaborate to

potentially enhance certain pipeline products of the Company at specific targets using Artisan’s gene editing and engineering technology. If the Artisan technology

F-15

 
 
 
is applied to any of the Company’s products, the Company will be responsible for the development, manufacturing, and commercialization of any such products. Under the terms
of the agreement, the Company was required to pay Artisan a nominal upfront fee, as well as costs associated with research and development activities. Artisan is eligible to receive
future research, development and regulatory milestones, and is also eligible to receive sales milestones and tiered royalties on net sales of products that incorporate the Artisan
technology. The Company can terminate the agreement at will upon advance written notice with payment of a nominal cancellation fee.

7. Commitments and Contingencies

Operating Lease Agreement

In February 2019, the Company entered into an operating lease agreement for new office space in Philadelphia, Pennsylvania. The lease term commenced in May 2019
and will expire in July 2022. The initial annual base rent is $261, and such amount will increase by 2% annually on each anniversary of the commencement date. The Company
records rent expense on a straight-line basis over the lease term. Rent expense related to this lease agreement recognized in the accompanying statement of operations was $266 and
$178 for the years ended December 31, 2020 and 2019.

As of December 31, 2020, the future minimum payments for operating leases are as follows:

 2021
2022
Thereafter

Other Purchase Commitments

$

$

268  
158  
—  

426

In the normal course of business, the Company enters into various purchase commitments with third-party contract manufacturers for the manufacture and processing of
its product candidates and related raw materials, contracts with contract research organizations for clinical trials and agreements with vendors for other services and products for
operating purposes. These agreements generally provide for termination or cancellation, other than for costs already incurred.  

Indemnification

The Company enters into certain types of contracts that contingently requires the Company to indemnify various parties against claims from third parties. These contracts
primarily relate to (i) the Company’s bylaws, under which the Company must indemnify directors and executive officers, and may indemnify other officers and employees, for
liabilities arising out of their relationship, (ii) contracts under which the Company must indemnify directors and certain officers and consultants for liabilities arising out of their
relationship,  (iii)  contracts  under  which  the  Company  may  be  required  to  indemnify  partners  against  certain  claims,  including  claims  from  third  parties  asserting,  among  other
things, infringement of their intellectual property rights, and (iv) procurement, consulting, or license agreements under which the Company may be required to indemnify vendors,
consultants or licensors for certain claims, including claims that may be brought against them arising from the Company’s acts or omissions with respect to the supplied products,
technology  or  services.  From  time  to  time,  the  Company  may  receive  indemnification  claims  under  these  contracts  in  the  normal  course  of  business.  In  addition,  under  these
contracts, the Company may have to modify the accused infringing intellectual property and/or refund amounts received.

In  the  event  that  one  or  more  of  these  matters  were  to  result  in  a  claim  against  the  Company,  an  adverse  outcome,  including  a  judgment  or  settlement,  may  cause  a
material  adverse  effect  on  the  Company’s  future  business,  operating  results  or  financial  condition.  It  is  not  possible  to  determine  the  maximum  potential  amount  under  these
contracts due to the limited history of prior indemnification claims and the unique facts and circumstances involved in each particular agreement.

F-16

 
 
 
 
 
 
 
 
8. Convertible Preferred Stock

Preferred Stock

Preferred Stock

The  Company  has  10,000,000  shares  of  authorized  preferred  stock  as  of  December  31,  2020,  none  of  which  is  issued  or  outstanding.  The  preferred  stock  is  not

redeemable and does not have a stated voting, dividend or liquidation preference.

Convertible Preferred Stock

The Company has issued Series A Preferred, Series A-1 Preferred, Series A-2 Preferred, and Series B Preferred of Convertible Preferred Stock. The Company classified
Convertible Preferred Stock outside of stockholders’ equity (deficit) because the shares contained deemed liquidation rights that were a contingent redemption feature not solely
within the control of the Company.

Series A Preferred

Series A-1 Preferred

Series A-2 Preferred

Series B Preferred

Amount

Shares

Amount

Balance—December 31, 2018

Issuance
Exchange, including
   deemed dividend
Issuance costs
Conversion to common
   stock

Balance—December 31, 2019

Shares
3,146,551  
—  

Amount

12,575  
—  

Shares
7,372,719  
—  

Amount

24,994  
—  

—  
—  

—  
—  

—  
—  

—  
—  

Shares
1,873,777  
—  

(1,405,332 )
—  

(3,146,551 )
—  

  $

(12,575 )
—  

(7,372,719 )
—  

  $

(24,994 )
—  

(468,445 )
—  

  $

6,352  
—  

(4,764 )
—  

(1,588 )
—  

—  
6,963,788  

1,405,332  
—  

—  
50,000  

10,090  
(1,293 )

Total Convertible
Preferred Stock

Shares
12,393,047  
6,963,788  

—  
—  

Amount

43,921  
50,000  

5,326  
(1,293 )

(8,369,120 )
—  

  $

(58,797 )
—  

(19,356,835 )
—  

  $

(97,954 )

—

In January 2019, the Company’s certificate of incorporation was amended to increase the authorized shares of Convertible Preferred Stock to 20,762,168 shares, and the
Company  issued  6,963,788  shares  of  Series  B  Preferred,  resulting  in  gross  proceeds  of  $50,000.  In  connection,  the  Company  issued  a  further  1,405,332  shares  of  Series  B
Preferred in exchange for 1,405,332 shares of Series A-2 Preferred. The Company determined the terms of the Series B Preferred to be materially, qualitatively different than the
terms of the Series A-2 Preferred and, as such, applied extinguishment accounting with respect to the Series A-2 Preferred received in the exchange resulting in removal of the
carrying  amount  of  the  Series A-2  Preferred  received  ($4,764),  the  addition  of  the  Series  B  Preferred  issued  at  fair  value  determined  with  reference  to  the  contemporaneous
issuance of Series B Preferred ($10,090) and the difference ($5,326) determined to be a deemed dividend recorded to additional paid-in capital (to the extent of paid-in capital) and
accumulated deficit within stockholders’ deficit on the balance sheet.

The  shares  of  Convertible  Preferred  Stock  had  various  rights,  including  voting  and  dividend  rights,  preferences  and  privileges,  including  optional  and  mandatory

conversion rights.

In October 2019, the Convertible Preferred Stock was converted into 12,904,534 shares of Common Stock. Certain holders of the Company’s Convertible Preferred Stock
elected to have such shares convert into 6,409,519 shares of non-voting Common Stock following the closing of the Company’s IPO. The non-voting shares of Common Stock
have the same rights and preferences as the Common Stock but are non-voting. No Convertible Preferred Stock was outstanding as of December 31, 2020 or 2019.

9. Common Stock

Common Stock

Pursuant to the Company’s Third Amended and Restated Certificate of Incorporation filed in October 2019, the Company is authorized to issue 143,590,481 shares of
voting common stock and 6,409,519 shares of non-voting common stock. Holders of voting common stock shall have the exclusive right to vote for the election of directors of the
Company and on all other matters requiring stockholder action. Each share of the Company’s non-voting common stock may be converted at any time into one share of common
stock at the option of its holder by providing written notice to the Company, subject to the limitations provided for in the amended and restated certificate of incorporation. In
August 2020, 1,733,904 shares of non-voting common stock were converted to voting common stock.

F-17

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
   
 
 
At-The-Market Offering Sales Agreement

On November 10, 2020, the Company filed a Shelf Registration Statement in relation to the registration of common stock, preferred stock, debt securities, warrants and/or
units  of  any  combination  thereof  for  the  purposes  of  selling,  from  time  to  time,  the  Company’s  common  stock,  debt  securities  or  other  equity  securities  in  one  or  more
offerings. The Company also simultaneously entered into a Sales Agreement with Cowen and Company, LLC, to provide for the offering, issuance and sale of up to an aggregate
amount  of  $75.0  million  of  the  Company’s  common  stock  from  time  to  time  in  “at-the-market”  offerings  under  the  Shelf  Registration  Statement  and  subject  to  the  limitations
thereof. No shares have been sold under the Sales Agreement as of December 31, 2020.

Share-based Payment Awards

In May 2018, several of the Company’s founders agreed to modify their shares of common stock outstanding to include vesting provisions that require continued service
to the Company in order to vest in those shares. As such, the 2,904,000 modified shares of common stock became compensatory upon such modification. The fair value of the
awards  on  the  modification  date  was  determined  to  be  $0.74  per  share  of  common  stock,  based  on  the  issuance  of  convertible  notes  in  May  2018,  considering  the  maximum
conversion price and the seniority of the notes. The total compensation cost resulting from the modification was $2,126. The total compensation cost is being recognized over the
three-year vesting term attendant to the founders’ common shares.

During the year ended December 31, 2020, the Company recognized $495 and $177 of this amount in research and development expense and general and administrative
expense, respectively. During the year ended December 31, 2019, the Company recognized $529 and $177 of this amount in research and development expense and general and
administrative expense, respectively.

 2018 Stock Option and Grant Plan

In September 2018, the Company adopted the 2018 stock option and grant plan (the 2018 Plan), which provided for the Company to sell or issue common stock, or other
stock-based awards, to employees, members of the board of directors and consultants of the Company. The Company generally granted stock-based awards with service conditions
only (service-based awards), although there was one grant with performance conditions. As of December 31, 2020, there are no unvested options with performance conditions.
Stock  options  granted  under  the  2018  Plan  generally  vest  over  three  to  four  years.  There  were  1,959,411  options  granted  under  the  2018  Plan  prior  to  the  Company’s  IPO  in
October 2019. No further grants may be made under the 2018 Plan subsequent to the IPO.

2019 Stock Option and Incentive Plan

The 2019 Stock Option and Incentive Plan (2019 Plan) was approved by the Company’s board of directors on October 14, 2019, and became effective on October 23,
2019.  The  2019  Plan  provides  for  the  grant  of  incentive  stock  options,  nonqualified  stock  options,  stock  appreciation  rights,  restricted  stock  units,  restricted  stock  awards,
unrestricted  stock  awards,  cash-based  awards  and  dividend  equivalent  rights  to  the  Company’s  officers,  employees,  directors  and  consultants.  The  number  of  shares  initially
reserved  for  issuance  under  the  2019  Plan  was  2,342,288, which  will  be  increased each  January  1  thereafter  by  4%  of  the  number  of  shares  of  the  Company’s  common  stock
outstanding on the immediately preceding December 31 or such lesser number of shares determined by the Company’s board of directors or compensation committee of the board
of  directors.  On  January  1,  2021,  the  total  number  of  shares  under  the  2019  Plan  was  increased  by  962,511  shares. As  of  December  31,  2020,  there  were  2,314,303  shares
remaining available for issuance.

F-18

 
A summary of the stock option activity is presented below:

Outstanding as of January 1, 2019
Granted
Exercised
Cancelled
Outstanding as of December 31, 2019
Granted
Exercised
Forfeited
Outstanding as of December 31, 2020

Options Exercisable at December 31, 2020

Number of
Shares

Weighted
Average
Exercise Price

971,353     $

1,340,839    
(5,667 )  
(176,893 )  
2,129,632    
813,172    
(25,611 )  
(16,714 )  
2,900,479     $
1,068,675     $

1.01    
7.97    
1.01    
4.22    
5.12    
13.03    
5.44    
6.30    
7.33    
4.04    

Weighted
Average
Remaining
Contractual
Term (years)

Aggregate
Intrinsic
Value

9.8     $

4,051  

9.2     $

18,844  

183  

16,303  
9,059

8.5     $
8.1     $

The aggregate intrinsic value of options granted is calculated as the difference between the exercise price of the options and the estimated fair value of the Company’s

common stock. The weighted average grant-date fair value of stock options granted during the year ended December 31, 2020 and 2019 was $8.31 and $5.24, respectively.

The fair value of each award is estimated using Black-Scholes based on the following assumptions:

Risk-free interest rate
Expected term
Expected volatility
Expected dividend yield

For the Year Ended December 31,

2020

2019

0.28%—1.48%  
5.7—6.1 years  
70%—79%  
0%  

1.39%—2.59%
0.3—6.1 years
70%—76%
0%

Black-Scholes requires the use of subjective assumptions which determine the fair value of stock-based awards. These assumptions include:

Fair value of common stock—Prior to the Company’s IPO in October 2019, the fair value of the Company’s common stock underlying stock-based awards was estimated on
each grant date by the Company’s board of directors. In order to determine the fair value of the Company’s common stock underlying stock-based awards, the Company’s
board of directors considered, among other things, a valuation of the Company’s common stock prepared by an unrelated third-party valuation firm in accordance with the
guidance  provided  by  the  American  Institute  of  Certified  Public  Accountants  Practice  Guide,   Valuation  of  Privately-Held-Company  Equity  Securities  Issued  as
Compensation.

Expected term—The expected term represents the period that stock-based awards are expected to be outstanding. The expected term for option grants is determined using
the simplified method, which is the midpoint between the vesting period and the contractual term of the option.

Expected volatility—As a privately held company prior to the Company’s IPO in October 2019, the Company has limited trading history for its common stock and, as such,
the expected volatility is estimated based on the average volatility for comparable publicly traded biotechnology companies over a period equal to the expected term of the
stock-based awards. The comparable companies were chosen based on their similar size, stage in the life cycle or area of specialty. The Company will continue to apply this
process until a sufficient amount of historical information regarding the volatility of its own stock price becomes available.

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 a stock-based award.

F-19

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
     
 
   
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
     
 
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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.

Stock-based Compensation

The Company has recorded stock-based compensation in the accompanying statements of operations as follows:

Research and development
General and administrative

Total

For the Year Ended December 31,

2020

2019

  $

  $

1,989     $
2,399    
4,388     $

1,304  
996  
2,300

As of December 31, 2020, there was $9,809 of unrecognized compensation cost related to unvested option awards, which is expected to be recognized over a weighted-
average period of 2.8 years. As  of  December  31,  2020,  there  was  $239  of  unrecognized  compensation  cost  related  to  unvested  founder  stock  awards,  which  is  expected  to  be
recognized over a weighted-average period of 0.3 years.

2019 Employee Stock Purchase Plan

The 2019 Employee Stock Purchase Plan (2019 ESPP) was approved by the Company’s board of directors on October 14, 2019, and became effective on October 23,
2019. A total of 234,229 shares of common stock were initially reserved for issuance under the 2019 ESPP, and will be increased each January 1 thereafter through January 1, 2029
by the least of (i) 234,229 shares of common stock, (ii) 1% of the number of shares of the Company’s common stock outstanding on the immediately preceding December 31 or
(iii)  such  lesser  number  of  shares  determined  by  the  2019  ESPP’s  administrator.  On  January  1,  2021,  the  total  number  of  shares  under  the  2019  ESPP  was  increased
by 234,229 shares.

Employee contributions are made through payroll deductions of up to 15% of eligible compensation over the offering period. A participant may not accrue rights to
purchase  more  than  $25  worth  of  the  Company’s  common  stock  for  each  calendar  year  in  which  such  right  is  outstanding. At  the  end  of  each  offering  period,  shares  of  the
Company’s  common  stock  may  be  purchased  at  85%  of  the  lesser  of  the  Company’s  common  stock  on  (i)  the  first  trading  day  of  the  relevant  offering  period  and  (ii)  the  last
trading day of the relevant offering period. The first offering period commenced on July 1, 2020 and ended on November 30, 2020. Thereafter, offerings will be six months in
duration  and  will  commence  on  each  December  1  and  June  1.  The  Company  recognized  stock-based  compensation  expense  of  $18  during  the  year  ended  December  31,  2020
related to the 2019 ESPP.

10. Income Taxes

The reconciliation of federal statutory income tax rate to the Company’s effective income tax rate is as follows:

Expected income tax benefit at the federal statutory rate
State and local taxes, net of federal benefit
Research and development credit, net
Non-deductible items and other
Change in valuation allowance

Total

F-20

For the Year Ended December 31,

2020

2019

21.0 % 
12.5  
2.6  
(0.8 )  
(35.3 )  
0.0 % 

21.0 %
13.1  
2.3  
(3.3 )
(33.1 )
0.0 %

 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Deferred  income  taxes  reflect  the  net  effects  of  temporary  differences  between  the  carrying  amounts  of  assets  and  liabilities  for  financial  reporting  purposes  and  the

amounts used for income tax purposes. The principal components of the Company’s deferred tax assets consisted of the following:

Deferred tax assets:

Federal, state and local net operating loss carryforwards
License fee deductions
Research and development tax credits
Stock-based compensation deductions
Accrued expenses

Gross deferred tax assets

Less: valuation allowance
Total deferred tax assets
Deferred tax liabilities:

Net deferred tax assets

December 31,

2020

2019

  $

  $
  $

15,241     $
340    
1,317    
1,243    
837    
18,978    
(18,978 )  
—    
—    
—     $
—     $

5,688  
362  
452  
264  
457  
7,223  
(7,223 )
—  
—  
—  
—

The Company increased its valuation allowance by $11,755 for the year ended December 31, 2020 in order to maintain a full valuation allowance against its deferred tax
assets. Based on the Company’s history of losses, the Company recorded a full valuation allowance against its deferred tax assets as of December 31, 2020. The Company intends
to maintain a valuation allowance until sufficient positive evidence exists to support a reversal of the allowance.

As  of  December  31,  2020,  the  Company  had  federal,  state  and  local  net  operating  loss  carryforwards  of  $45,550,  $47,735  and  $38,645,  respectively;  $45,301  of  the
federal amounts do not expire, and the remaining $249 expire in 2037. The state net operating losses begin to expire in 2037. The local net operating losses begin to expire in 2039.
As of December 31, 2020, the Company had federal research and development tax credit carryforwards of $1,317, which begin to expire in 2038. Under the provisions of Sections
382 and 383 of the Internal Revenue Code of 1986, as amended (the IRC), these net operating losses, credit carryforwards and other tax attributes may be subject to limitation
based on previous significant changes in ownership and upon future significant changes in ownership of the Company, as defined by the IRC.

The Company files income tax returns in the U.S. federal jurisdiction as well as in Pennsylvania and Philadelphia. The tax years 2019, 2018 and 2017 remain open to

examination by the jurisdictions where the Company is subject to tax.

The Company evaluates tax positions for recognition using a more-likely-than-not recognition threshold, and those tax positions eligible for recognition are measured as
the  largest  amount  of  tax  benefit  that  is  greater  than  50%  likely  of  being  realized  upon  the  effective  settlement  with  a  taxing  authority  that  has  full  knowledge  of  all  relevant
information. As of December 31, 2020, the Company had no unrecognized income tax benefits that would affect the Company’s effective tax rate if recognized.

F-21

 
 
 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
11. Net Loss Per Share

The Company calculates basic and diluted net loss per share attributable to common stockholders in conformity with the two-class method required for participating
securities. For the years ended December 31, 2020 and 2019, the Company had voting and non-voting common stock outstanding. Since the rights of the voting and non-voting
common stock are identical, except with respect to voting, the undistributed losses of the Company have been allocated on a proportionate basis to the two classes. Diluted net loss
per share is calculated using the if-converted method, which assumes conversion of all non-voting common stock to voting common stock.

Basic net loss per share:

Numerator

Allocation of undistributed losses attributable to common stockholders

Denominator

Weighted average number of shares used in basic per share computation

Net loss per share, basic

Diluted net loss per share:

Numerator

Allocation of undistributed losses for basic computation
Reallocation of undistributed losses as a result of conversion of
     non-voting to voting common shares
Allocation of undistributed losses

Denominator

Weighted average number of shares used in basic per share computation
Add: Conversion of non-voting to voting common shares outstanding
Weighted average number of shares used in diluted per share computation

Net loss per share, diluted

F-22

Year ended December 31, 2020

Voting common stock

  Non-voting common stock  

$

$

$

$

$

(25,090 )  

$

(8,249 )

17,417,900    
(1.44 )  

$

5,727,327  
(1.44 )

(25,090 )  

$

(8,249 )  
(33,339 )  

$

17,417,900    
5,727,327    
23,145,227    
(1.44 )  

$

(8,249 )

—  
(8,249 )

5,727,327  
—  
5,727,327  
(1.44 )

 
 
 
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
Basic net loss per share:

Numerator

Allocation of undistributed losses attributable to common stockholders

Denominator

Weighted average number of shares used in basic per share computation

Net loss per share, basic

Diluted net loss per share:

Numerator

Allocation of undistributed losses for basic computation
Reallocation of undistributed losses as a result of conversion of
     non-voting to voting common shares
Allocation of undistributed losses

Denominator

Weighted average number of shares used in basic per share computation
Add: Conversion of non-voting to voting common shares outstanding
Weighted average number of shares used in diluted per share computation

Net loss per share, diluted

Year ended December 31, 2019

Voting common stock

  Non-voting common stock  

$

$

$

$

$

(17,693 )  

$

(4,576 )

4,345,530    
(4.07 )  

$

1,123,861  
(4.07 )

(17,693 )  

$

(4,576 )  
(22,269 )  

$

4,345,530    
1,123,861    
5,469,391    
(4.07 )  

$

(4,576 )

—  
(4,576 )

1,123,861  
—  
1,123,861  
(4.07 )

The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share, as their effect is anti-dilutive:

Stock options to purchase common stock
Non-vested founder stock
Total

For the Year Ended December 31,

2020

2019

2,900,479    
465,801    
3,366,280    

2,129,632  
1,388,977  
3,518,609

F-23

 
 
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
     
 
   
 
 
     
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
12. 401(k) Savings Plan

The Company maintains a defined-contribution savings plan under Section 401(k) of the IRC, or the 401(k) Plan. The 401(k) Plan covers all employees who meet defined
minimum  age  and  service  requirements  and  allows  participants  to  defer  a  portion  of  their  annual  compensation  on  a  pretax  basis.  In  2019,  the  Company  made  a  safe  harbor
nonelective  contribution  of  3%  of  eligible  compensation  on  behalf  of  all  employees.  Effective  January  1,  2020,  the  Plan  provided  for  matching  contributions  on  a  portion  of
participant contributions pursuant to the 401(k) Savings Plan’s matching formula, up to 4% of eligible compensation. All matching contributions and participant contributions vest
immediately. Contributions totaled $203 and $74 for the years ended December 31, 2020 and 2019, respectively, and have been recorded in the statements of operations.

13. Subsequent Events

In January 2021, the Company entered into a Development and Manufacturing Services Agreement (Wuxi Agreement) with WuXi Advanced Therapies (Wuxi) to
serve  as  the  Company’s  cell  processing  manufacturing  partner  for  the  anticipated  MuSK-CAART  Phase  1  clinical  trial.   The  Company  has  the  right  to  terminate  the  Wuxi
Agreement for convenience or other reasons specified in the Wuxi Agreement upon prior written notice. If the Company terminates the Wuxi Agreement, it will be obligated to pay
an early termination fee of $1,500.

In February 2021, the Company entered into a research service agreement with CHOP for vector manufacturing, with a total cost of $670, expected to be incurred

during 2021.

F-24

 
 
 
 
 
Exhibit
Number

EXHIBIT INDEX

Description

3.1

3.2

4.1

4.2

4.3

10.1#

10.2#

10.3#

10.4#

10.5#

10.6#

10.7+

10.8+

10.9+

  Third Amended and Restated Certificate of Incorporation of the Registrant, as currently in effect (incorporated by reference to Exhibit 3.1 of the
Registrant’s Current Report on Form 8-K (File No. 001-39103) filed on October 30, 2019)

  Amended and Restated Bylaws of the Registrant, as currently in effect (incorporated by reference to Exhibit 3.2 of the Registrant’s Current Report
on Form 8-K (File No. 001-39103) filed on October 30, 2019)

  Specimen Common Stock Certificate (incorporated by reference to Exhibit 4.1 of the Registrant’s Registration Statement on Form S-1 (File No.
333-234017) filed on October 16, 2019)

  Amended and Restated Investors' Rights Agreement among the Registrant and certain of its stockholders, dated January 2, 2019 (incorporated by
reference to Exhibit 4.2 of the Registrant’s Registration Statement on Form S-1 (File No. 333-234017) filed on September 30, 2019)

  Description of Securities (incorporated by reference to Exhibit 4.3 of the Registrant’s Annual Report on Form 10-K (File No. 001-39103) filed on
March 30, 2020)

  2018  Stock  Option  and  Grant  Plan,  as  amended,  and  form  of  award  agreements  thereunder  (incorporated  by  reference  to  Exhibit  10.1  of  the
Registrant’s Registration Statement on Form S-1 (File No. 333-234017) filed on September 30, 2019)

  2019  Stock  Option  and  Incentive  Plan,  and  form  of  award  agreements  thereunder.  (incorporated  by  reference  to  Exhibit  10.2  of  the  Registrant’s
Registration Statement on Form S-1/A (File No. 333-234017) filed on October 16, 2019)

  2019 Employee Stock Purchase Plan. (incorporated by reference to Exhibit 10.3 of the Registrant’s Registration Statement on Form S-1/A (File No.
333-234017) filed on October 16, 2019)

  Senior Executive Cash Incentive Bonus Plan (incorporated by reference to Exhibit 10.4 of the Registrant’s Quarterly Report on Form 10-Q filed on
December 5, 2019)

  Form of Indemnification Agreement between the Registrant and each of its directors (incorporated by reference to Exhibit 10.5 of the Registrant’s
Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  Form  of  Indemnification Agreement  between  the  Registrant  and  each  of  its  executive  officers  (incorporated  by  reference  to  Exhibit  10.4  of  the
Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  Amended and Restated License Agreement, dated as of July 23, 2019, among the Registrant, the Trustees of the University of Pennsylvania and the
Children’s Hospital of Philadelphia (incorporated by reference to Exhibit 10.6 to the Registrant’s Registration Statement on Form S-1, filed with the
SEC on September 30, 2019)

  Sponsored  Research  Agreement,  dated  as  of  April  23,  2018,  between  the  Registrant  and  the  Trustees  of  the  University  of  Pennsylvania
(incorporated by reference to Exhibit 10.7 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  Sponsored  Research  Agreement,  dated  as  of  April  23,  2018,  between  the  Registrant  and  the  Trustees  of  the  University  of  Pennsylvania
(incorporated by reference to Exhibit 10.8 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

144

 
 
 
 
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
10.10+

10.11+

10.12+

10.13+

10.14

10.15#

10.16#

10.17#

10.18#

10.19#

10.20#

10.21+

10.22+

  Master  Translational  Research  Services  Agreement,  dated  as  of  October  2018,  between  the  Registrant  and  the  Trustees  of  the  University  of
Pennsylvania (incorporated by reference to Exhibit 10.9 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September
30, 2019)

  CAROT Master Services Addendum to Master Translational Research Services Agreement, dated as of February 4, 2019, between the Registrant
and the Trustees of the University of Pennsylvania (incorporated by reference to Exhibit 10.10 to the Registrant’s Registration Statement on Form
S-1, filed with the SEC on September 30, 2019)

  CVPF Master Services Addendum to Master Translational Research Services Agreement, dated as of October 22, 2018, between the Registrant and
the Trustees of the University of Pennsylvania (incorporated by reference to Exhibit 10.11 to the Registrant’s Registration Statement on Form S-1,
filed with the SEC on September 30, 2019)

  Research Agreement A19-3095, dated as of October 31, 2018, between the Registrant and The Regents of the University of California (incorporated
by reference to Exhibit 10.12 to the Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  Lease,  dated  as  of  February  11,  2019,  between  the  Registrant  and  Brandywine  Cira,  L.P.  (incorporated  by  reference  to  Exhibit  10.13  to  the
Registrant’s Registration Statement on Form S-1, filed with the SEC on September 30, 2019)

  Employment Agreement between the Registrant and Steven Nichtberger (incorporated by reference to Exhibit 10.16 to the Registrant’s Registration
Statement on Form S-1, filed with the SEC on September 30, 2019)

  Employment Agreement  between  the  Registrant  and Anup  Marda  (incorporated  by  reference  to  Exhibit  10.17  to  the  Registrant’s  Registration
Statement on Form S-1, filed with the SEC on September 30, 2019)

  Employment Agreement between the Registrant and Gwendolyn Binder (incorporated by reference to Exhibit 10.18 to the Registrant’s Registration
Statement on Form S-1, filed with the SEC on September 30, 2019)

  Employment Agreement  between  the  Registrant  and  David  Chang  (incorporated  by  reference  to  Exhibit  10.19  to  the  Registrant’s  Registration
Statement on Form S-1, filed with the SEC on September 30, 2019)

  Employment Agreement  between  the  Registrant  and  Brian  Stalter  (incorporated  by  reference  to  Exhibit  10.20  to  the  Registrant’s  Registration
Statement on Form S-1, filed with the SEC on September 30, 2019)

  Non-Employee Director Compensation Policy (incorporated by reference to Exhibit 10.1 to the Registrant’s Annual Report on Form 10-K (File No.
001-39103) filed on March 30, 2020)

  Amendment No. 1, dated May 27, 2020, to the Sponsored Research Agreement, dated April 23, 2018, between the Registrant and the Trustees of
the University of Pennsylvania (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K (File No. 001-39103)
filed on May 28, 2020)

  First Amendment, dated May 27, 2020, to the Amended and Restated License Agreement, dated July  23, 2019, among the Registrant, the Trustees
of the University of Pennsylvania and the Children’s Hospital of Philadelphia (incorporated by reference to Exhibit 10.2 to the Registrant’s Current
Report on Form 8-K (File No. 001-39103) filed on May 28, 2020)

145

 
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
10.23+

10.24+

21.1*

23.1*

31.1*

31.2*

32.1**

32.2**

  Amendment to CAROT Master Services Addendum to Master Translational Research Services Agreement, dated as of May 18, 2020 between the
Registrant and the Trustees of the University of Pennsylvania (incorporated by reference to Exhibit 10.1 to the Registrant’s Quarterly Report on
Form 10-Q (File No. 001-39103) filed on August 6, 2020)

  Amendment No. 2, dated August 17, 2020, to the Sponsored Research Agreement, dated April 23, 2018, as amended by Amendment No. 1 dated
May  27,  2020,  between  the  Registrant  and  the  Trustees  of  the  University  of  Pennsylvania  (incorporated  by  reference  to  Exhibit  10.1  to  the
Registrant’s Quarterly Report on Form 10-Q (File No. 001-39103) filed on November 10, 2020)

  List of Subsidiaries of the Registrant

  Consent of Ernst & Young, independent registered public accounting firm

  Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as amended

  Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as amended

  Certification  of  Principal  Executive  Officer  Pursuant  to  18  U.S.C.  Section  1350,  as Adopted  Pursuant  to  18  U.S.C.  Section  1350,  as  adopted
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
  Certification  of  Principal  Financial  Officer  Pursuant  to  18  U.S.C.  Section  1350,  as  Adopted  Pursuant  to  18  U.S.C.  Section  1350,  as  adopted
Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

101.INS

  XBRL Instance Document

101.SCH

  XBRL Taxonomy Extension Schema Document

101.CAL

  XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF

  XBRL Taxonomy Extension Definition Linkbase Document

101.LAB

  XBRL Taxonomy Extension Label Linkbase Document

101.PRE

  XBRL Taxonomy Extension Presentation Linkbase Document

#
+
*
**

Management Contract or compensatory plan or arrangement.
Confidential treatment has been granted by the Securities and Exchange Commission as to certain portions.
Filed herewith.
The certifications furnished in Exhibit 32.1 and 32.2 hereto are deemed to accompany this Annual Report on Form 10-K and will not be deemed “filed” for purposes of
Section  18  of  the  Securities  Exchange Act  of  1934,  as  amended.  Such  certifications  will  not  be  deemed  to  be  incorporated  by  reference  into  any  filings  under  the
Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended, except to the extent that the Registrant specifically incorporates it by reference.

146

 
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
   
 
 
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 Form 10-K to be signed on its

behalf by the undersigned, thereunto duly authorized.

 SIGNATURES

Date: March 16, 2021

Cabaletta Bio, Inc.

By:

/s/ Steven Nichtberger
Steven Nichtberger
Chief Executive Officer and President

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this Annual Report on Form 10-K 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/ Steven Nichtberger
Steven Nichtberger

Director, Chief Executive Officer and President

  March 16, 2021

  (Principal Executive Officer)

/s/ Anup Marda
Anup Marda

Chief Financial Officer

  (Principal Financial and Accounting Officer)

/s/ Catherine Bollard
Catherine Bollard

/s/ Brian Daniels
Brian Daniels

/s/ Richard Henriques
Richard Henriques

/s/ Mark Simon
Mark Simon

Director

Director

Director

Director

  March 16, 2021

  March 16, 2021

  March 16, 2021

  March 16, 2021

  March 16, 2021

147

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
None.

List of Subsidiaries

Exhibit 21.1

 
Consent of Independent Registered Public Accounting Firm

Exhibit 23.1

We consent to the incorporation by reference in the following Registration Statements:

(1)  Registration Statement (Form S-8 No. 333-234367) pertaining to the Cabaletta Bio, Inc. 2018 Stock Option and Incentive Plan, the Cabaletta Bio, Inc. 2019 Stock Option
and Incentive Plan, and the Cabaletta Bio, Inc. 2019 Employee Stock Purchase Plan,
(2) Registration Statement (Form S-8 No. 333-237484) pertaining to the Cabaletta Bio, Inc. 2019 Stock Option and Incentive Plan and the Cabaletta Bio, Inc. 2019 Employee
Stock Purchase Plan, and
(3) Registration Statement (Form S-3 No. 333-250006) of Cabaletta Bio, Inc.

of our report dated March 16, 2021, with respect to the financial statements of Cabaletta Bio, Inc. included in this Annual Report (Form 10-K) for the year ended December 31,
2020.

/s/ Ernst & Young LLP

Philadelphia, Pennsylvania

March 16, 2021

 
 
 
 
 
 
Exhibit 31.1

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Steven Nichtberger, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2020 of Cabaletta Bio, Inc. (the “registrant”);

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,
in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter
(the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's
internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's
auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant's ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over
financial reporting.

Date: March 16, 2021

By:

/s/ Steven Nichtberger
Steven Nichtberger
Chief Executive Officer and President
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 31.2

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Anup Marda, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K for the year ended December 31, 2020 of Cabaletta Bio, Inc. (the "registrant");

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,
in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance
with generally accepted accounting principles;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter
(the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's
internal control over financial reporting; and

5.

The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's
auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant's ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over
financial reporting.

Date: March 16, 2021

By:

/s/ Anup Marda
Anup Marda
Chief Financial Officer
(Principal Financial and Accounting Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

In connection with the Annual Report of Cabaletta Bio, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 31, 2020 as filed with the Securities

and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: March 16, 2021

By:

/s/ Steven Nichtberger
Steven Nichtberger
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
 
 
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.2

In connection with the Annual Report of Cabaletta Bio, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 31, 2020 as filed with the Securities

and Exchange Commission on the date hereof (the “Report”), I certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: March 16, 2021

By:

/s/ Anup Marda
Anup Marda
Chief Financial Officer
(Principal Accounting and Financial Officer)