You should read the following discussion and analysis of our financial condition
and results of operations together with the section entitled "Risk Factors" and
our unaudited interim condensed financial statements and related notes appearing
elsewhere in this Quarterly Report on Form 10-Q and with our audited financial
statements and the notes thereto for the year ended December 31, 2019 included
in our Annual Report on Form 10-K filed with the Securities and Exchange
Commission. Some of the information contained in this discussion and analysis or
set forth elsewhere in this Quarterly 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.

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 products
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 skin
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. We expect to
report the acute safety data from the first cohort of patients in the
DesCAARTesTM trial in the first 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 2nd 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 September 30,
2020, we had $118.1 million in cash and cash equivalents and investments.

Impact of the COVID-19 Pandemic



In December 2019, a novel strain of coronavirus (COVID-19) was reported to have
surfaced in Wuhan, China and, in March 2020 was declared a pandemic by the World
Health Organization. The virus continues to spread globally, including in the
United States, and efforts to contain the spread of COVID-19, including severe
travel restrictions, social distancing requirements, stay-at-home orders and
other measures, have delayed the commencement of non-COVID-19-related clinical
trials, among other restrictions. As a result, the COVID-19 pandemic has caused
significant disruptions to the U.S., regional and global economies and has
contributed to significant volatility and negative pressure in financial
markets.

We have been carefully monitoring the COVID-19 pandemic and its potential impact
on our business and have taken important steps to help ensure the safety of
employees and their families and to reduce the spread of COVID-19
community-wide. We have a work-from-home policy for all employees, other than
those performing or supporting business-critical operations, such as certain
members of our laboratory staff. For those employees, we have implemented
stringent safety measures designed to comply with applicable federal, state and
local guidelines instituted in response to the COVID-19 pandemic. We have also
maintained efficient

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communication with our partners and potential clinical sites as the COVID-19 situation has progressed. We have taken these precautionary steps while maintaining business continuity so that we can continue to progress our programs.



The Company's financial results for the three and nine months ended September
30, 2020 were not significantly impacted by COVID-19. However, the future impact
of the COVID-19 pandemic on our industry, the healthcare system and our current
and future operations and financial condition will depend on future
developments, which are highly uncertain and cannot be predicted with
confidence, including the scope, severity and duration of the pandemic, the
actions taken to contain the pandemic or mitigate its impact, and the direct and
indirect economic effects of the pandemic and containment measures, among
others. The Company cannot at this time predict the specific extent, duration,
or full impact that the COVID-19 pandemic will have on its financial condition,
operations, and business plans for 2020, including its ability to raise
additional capital, the timing and enrollment of patients in its planned
clinical trials, future financings and other expected milestones of its product
candidates.

See "Item 1A. Risk Factors" for a discussion of the potential adverse impact of COVID-19 on our business, results of operations and financial condition.

Key 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 amended in May 2020, with Penn and the Children's Hospital
of Philadelphia, or CHOP and collectively with Penn, 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
Institutions 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 rights
retained by the Institutions.

Unless earlier terminated, the License Agreement will expire with respect to a
product upon the later of (a) the expiration of the last to expire patent or
patent application covering such product or (b) 10 years after the first
commercial sale of such product. We may terminate the License Agreement in its
entirety or on a subfield-by-subfield basis at any time for convenience upon a
certain number of days' prior written notice. Penn may terminate the License
Agreement in its entirety or on a subfield-by-subfield basis for our uncured
material breach, including for our failure to meet certain diligence obligations
and milestone events. We, however, may extend the achievement date of any
milestone event for an additional period of time by making a payment in a
certain amount, subject to certain limitations in the number of times each event
may be extended.

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, one of the agreements
was amended to expand the scope of research. 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.

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. 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.

                                       19







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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.

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 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 Penn, 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;


                                       20







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• the impact of any business interruptions to our operations, including the

timing and enrollment of patients in our 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;


    •   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

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.

                                       21







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Results of Operations for the Three Months ended September 30, 2020 and 2019



The following sets forth our results of operations for the three months ended
September 30, 2020 and 2019:



                                      Three Months Ended September 30,
                                         2020                  2019            Change
                                               (in thousands)
   Statements of Operations Data:
   Operating expenses:
   Research and development         $         5,650       $         3,220     $  2,430
   General and administrative                 2,766                 1,811          955
   Total operating expenses                   8,416                 5,031        3,385
   Loss from operations                      (8,416 )              (5,031 )     (3,385 )
   Other income:
   Interest income                               23                   381         (358 )
   Net loss                         $        (8,393 )     $        (4,650 )   $ (3,743 )


Research and Development

Research and development expenses were $5.7 million for the three months ended
September 30, 2020 as compared to $3.2 million for the three months ended
September 30, 2019. The table below summarizes our research and development
expenses:



                                                    Three Months Ended September 30,
                                                      2020                     2019             Change
                                                             (in thousands)
Sponsored research activities                   $            645         $            733     $      (88 )
License of intellectual property and
subscription fee                                              10                      267           (257 )
Manufacturing of preclinical and clinical
supplies                                                   1,209                      262            947
Clinical trials                                              297                      152            145
Personnel                                                  1,857                    1,218            639
Development services                                       1,591                      519          1,072
Other                                                         41                       69            (28 )
                                                $          5,650         $          3,220     $    2,430

Specific changes in our research and development expenses include a:

$1.0 million net increase in costs under our development services and
        sponsored research agreements from increased outsourced preclinical
        research activities and increased purchases of lab supplies;

$0.9 million increase in manufacturing costs due to vector manufacturing

and cell processing capabilities and related activities;

$0.6 million increase in personnel costs due to the hiring of additional


        employees, including an increase of $0.2 million of stock-based
        compensation expense;

$0.2 million increase in clinical trial expense, primarily from start-up


        costs of the DesCAARTesTM Trial; and


    •   a $0.3 million decrease in license of intellectual property and

subscription fees due to a non-refundable payment made to Penn under a


        Subscription and Technology Transfer Agreement in the third quarter of
        2019.




General and Administrative

General and administrative expenses were $2.8 million for the three months ended
September 30, 2020 compared to $1.8 million for the three months ended September
30, 2019. The increase of $1.0 million in our general and administrative
expenses includes:

$0.7 million of increased costs related to personnel from the hiring of

additional employees, including an increase of $0.4 million of stock-based

compensation expense;

$0.6 million of increased insurance costs, primarily as a result of being
        a public company; and


                                       22







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• a $0.3 million decrease in costs of services, primarily from lower

consulting and legal costs as the result of transitioning to more

full-time employees.

Other Income



Interest income decreased $0.4 million for the three months ended September 30,
2020 compared to the three months ended September 30, 2019 on a higher balance
of cash and cash equivalents and investments, as a result of a significant
decrease in interest rates beginning in March 2020.



Results of Operations for the Nine Months ended September 30, 2020 and 2019



The following sets forth our results of operations for the nine months ended
September 30, 2020 and 2019:



                                       Nine Months Ended September 30,
                                         2020                   2019            Change
                                               (in thousands)

Statements of Operations Data:


  Operating expenses:
  Research and development         $         15,601       $          8,645     $   6,956
  General and administrative                  8,902                  4,178         4,724
  Total operating expenses                   24,503                 12,823        11,680
  Loss from operations                      (24,503 )              (12,823 )     (11,680 )
  Other income:
  Interest income                               473                  1,283          (810 )
  Net loss                         $        (24,030 )     $        (11,540 )   $ (12,490 )


Research and Development

Research and development expenses were $15.6 million for the nine months ended
September 30, 2020 as compared to $8.6 million for the nine months ended
September 30, 2019. The table below summarizes our research and development
expenses:



                                                     Nine Months Ended September 30,
                                                      2020                     2019             Change
                                                             (in thousands)
Sponsored research activities                   $           2,026         $         2,199     $     (173 )
License of intellectual property and
subscription fee                                               43                     275           (232 )
Manufacturing of preclinical and clinical
supplies                                                    3,920                   1,899          2,021
Clinical trials                                               840                     152            688
Personnel                                                   5,493                   2,519          2,974
Development services                                        3,182                   1,471          1,711
Other                                                          97                     130            (33 )
                                                $          15,601         $         8,645     $    6,956

Specific changes in our research and development expenses include a:

$3.0 million increase in personnel costs due to the hiring of additional


        employees, including an increase of $0.5 million of stock-based
        compensation expense;

$2.0 million increase in manufacturing costs primarily due to vector

manufacturing;

$1.5 million net increase in costs under our development services and
        sponsored research agreements from increased outsourced preclinical
        research activities and increased purchases of lab supplies;

$0.7 million increase in clinical trial expense from start-up costs of the


        DesCAARTesTM Trial, and


    •   a $0.2 million decrease in license of intellectual property and

subscription fees due to a non-refundable payment made to Penn under a


        Subscription and Technology Transfer Agreement in the third quarter of
        2019.




                                       23







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General and Administrative



General and administrative expenses were $8.9 million for the nine months ended
September 30, 2020 compared to $4.2 million for the nine months ended September
30, 2019. The increase of $4.7 million in our general and administrative
expenses includes:

$2.3 million of increased costs related to personnel from the hiring of

additional employees, including an increase of $0.7 million of stock-based

compensation expense;

$1.7 million of increased insurance costs, primarily as a result of being

a public company; and

$0.7 million of increased costs of services, including legal, audit and


        accounting, public relations, recruiting and other consulting fees,
        primarily as a result of being a public company.




Other Income

Interest income decreased $0.8 million, to $0.5 million for the nine months
ended September 30, 2020 from $1.3 million for the nine months ended September
30, 2019 on a higher balance of cash and cash equivalents and investments, as a
result of a significant decrease in interest rates beginning in March 2020.

Liquidity and Capital Resources



Since our inception in April 2017 through September 30, 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 September 30, 2020,
we had $118.1 million in cash and 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 September 30, 2020, we
had an accumulated deficit of $57.0 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 and
cash equivalents and investments as of September 30, 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. Market volatility resulting from the COVID-19 pandemic or other
factors could also adversely impact our ability to access capital as and when
needed. 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.

                                       24







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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, including the

timing and enrollment of patients in our 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;

• 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:





                                                           Nine Months Ended September 30,
                                                              2020                  2019
                                                                   (in thousands)
Net cash (used in) provided by:
Operating activities                                    $        (17,597 )     $       (8,162 )
Investing activities                                              (9,872 )               (420 )
Financing activities                                                 (56 )             46,606

Net (decrease) increase in cash and cash equivalents $ (27,525 )

   $       38,024


Operating Activities

During the nine months ended September 30, 2020, cash used in operating
activities of $17.6 million was attributable to a net loss of $24.0 million,
partially offset by non-cash charges of $3.4 million, primarily from stock-based
compensation and depreciation expense and a net change of $3.0 million in our
net operating assets and liabilities.

During the nine months ended September 30, 2019, cash used in operating
activities of $8.2 million was attributable to our net loss of $11.5 million,
partially offset by non-cash charges of $1.5 million from stock-based
compensation and depreciation expense and a net change of $1.8 million in our
net operating assets and liabilities.

Investing Activities



During the nine months ended September 30, 2020, cash used in investing
activities of $9.9 million was attributable to $11.1 million of purchases of
available-for-sale investments and $0.4 million of purchases of property and
equipment, partially offset by proceeds of $1.6 million from maturities of
available-for-sale investments.

                                       25







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During the nine months ended September 30, 2019, $0.4 million of cash used in investing activities consisted of purchases of property and equipment.

Financing Activities

During the nine months ended September 30, 2020, cash used in financing activities was for payments of common stock issuance costs from our IPO in October 2019, partially offset by proceeds from stock option exercises.

During the nine months ended September 30, 2019, our financing activities provided $48.7 million of net proceeds upon the issuance of convertible preferred stock in January 2019, partially offset by $2.1 million of deferred offering costs related to our initial public offering.

Contractual Obligations and Commitments

For a discussion of contractual obligations and other commitments affecting us, see the discussion under the heading "Management Discussion and Analysis of Financial Condition and Results of Operations - Contractual obligations and other commitments" included in our Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC on March 30, 2020.



In May 2020, we entered into (i) an amendment to one of our SRAs with Penn,
which increased our research commitment by $3.3 million, (ii) an amendment to
our License Agreement with Penn and CHOP, which added certain intellectual
property relating to an undisclosed disease target, and (iii) an amendment to
our CAROT agreement, which increased future expenses by $1.3 million. Otherwise,
there have been not been any material changes since December 31, 2019 to the
Company's contractual obligations and other commitments.

Off-Balance Sheet Arrangements

During the period 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

Aside from the Investments accounting policy described in the notes to our financial statements, the Critical Accounting Policies and Significant Judgments and Estimates included in our Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC on March 30, 2020, have not materially changed.

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

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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



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 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.
We will adopt Topic 842 for our annual period ending December 31, 2021, and we
have yet to evaluate the effect that ASU 2016-02 will have on our financial
statements or financial statement disclosures.

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