You should read the following discussion and analysis of our financial condition
and results of operations together with our unaudited condensed consolidated
financial statements and notes thereto in Part I, Item 1 of this Quarterly
Report on Form 10-Q and with our audited consolidated financial statements and
notes thereto for the year ended December 31, 2019, and management's discussion
and analysis, included in our Annual Report on Form 10-K filed with the U.S.
Securities and Exchange Commission (SEC) on March 5, 2020. This discussion and
other parts of this report contain forward-looking statements that involve risk
and uncertainties, such as statements of our plans, objectives, expectations,
and intentions. Our actual results could differ materially from those discussed
in these forward-looking statements. Factors that could cause or contribute to
such differences include, but are not limited to, those discussed in the section
of this report entitled "Risk Factors."

Overview



We are a clinical-stage biopharmaceutical company focused on creating
best-in-class cancer therapies. Our initial focus has been on well-characterized
biological pathways with significant scientific data supporting their
importance. We have built a robust and highly efficient drug discovery
capability to create highly differentiated small molecules, which we have the
ability to develop in combinations with our monoclonal antibodies through
rationally designed, indication-specific, adaptive clinical trial designs. Our
vision is to create, develop and commercialize highly differentiated combination
cancer therapies that have the potential to cure.

We currently have four investigational products in clinical development. We hold
worldwide development and commercialization rights to each of these
investigational products with the exception of zimberelimab, for which we hold
rights outside of China and Thailand. Taiho Pharmaceutical Co., Ltd. (Taiho) has
a time-limited option to exclusively license the development and
commercialization rights to each of our programs for Japan and certain other
territories in Asia (excluding China), which they have exercised with respect to
our adenosine receptor antagonist program, including etrumadenant (formerly
referred to as AB928), and our anti-PD-1 program, including zimberelimab. Gilead
Sciences, Inc. (Gilead) has a time-limited option to obtain an exclusive license
to all of our current and future clinical programs, subject to the rights of our
existing partners to any territories. Upon closing of our Option, License and
Collaboration Agreement with Gilead (the Gilead Collaboration Agreement), Gilead
obtained an exclusive license to our zimberelimab program.

Etrumadenant (formerly referred to as AB928), our small molecule dual A2a/A2b
adenosine receptor antagonist, is in clinical development, and is being
evaluated in four Phase 1b expansion studies in specific cancer indications:
advanced colorectal cancer, triple negative breast cancer, EGFR-mutated lung
cancer, and prostate cancer; two collaboration studies with Genentech utilizing
their MORPHEUS Phase 1b/2 platform in third-line metastatic colorectal cancer
and first-line metastatic pancreatic cancer; a Phase 1b/2 multi-cohort platform
trial in participants with metastatic castrate resistant prostate cancer; and a
Phase 1b trial in participants with colorectal cancer.

AB680, our small-molecule CD73 inhibitor, is in a Phase 1/1b study for the
treatment of first-line metastatic pancreatic cancer. This study consists of a
safety dose-escalation portion, followed by an enrollment expansion to evaluate
the combination of AB680, zimberelimab (our anti-PD-1 antibody) and the
standard-of-care chemotherapies gemcitabine and nab-paclitaxel.

Domvanalimab (formerly referred to as AB154), our in-licensed anti-TIGIT monoclonal antibody, is in Phase 2 development for the treatment of first-line metastatic non-small cell lung cancer in combination with zimberelimab and etrumadenant (formerly referred to as AB928).



Zimberelimab (formerly referred to as AB122), our in-licensed anti-PD-1
monoclonal antibody, is the cornerstone of our combination strategy. In addition
to the combination studies with zimberelimab described above, we are also
evaluating zimberelimab as monotherapy in a tumor-agnostic, biomarker-selected
Phase 1b trial.

Gilead Collaboration

On May 27, 2020, we entered into an Option, License and Collaboration Agreement
(Gilead Collaboration Agreement), Common Stock Purchase Agreement (the Purchase
Agreement), and Investor Rights Agreement, each with Gilead Sciences, Inc.
(Gilead). The transaction closed on July 13, 2020 following expiration of the
antitrust waiting period. Upon closing, Gilead made an upfront payment of $175
million pursuant to the Gilead Collaboration Agreement, Gilead made an equity
investment of approximately $200 million in us by purchasing 5,963,029 shares of
our common stock at a per share price of $33.54 pursuant to the Purchase
Agreement, and we appointed Gilead's designee, Merdad Parsey, M.D., Ph.D., to
our Board of Directors pursuant to the Investor Rights Agreement.

Pursuant to the terms of the Gilead Collaboration Agreement, Gilead has an
exclusive license to develop and commercialize zimberelimab (formerly referred
to as AB122) in certain markets and obtained exclusive options to acquire an
exclusive license to develop and commercialize all of our current and future
clinical programs during the 10-year collaboration term and, for those programs
that enter clinical development prior to the end of the collaboration term, for
up to an additional three years thereafter. Gilead may exercise its option, on a
program-by-program basis, upon payment of an option fee that ranges from $200
million to $275

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million per program for our current clinical programs, and $150 million per
program for all other programs that enter clinical development. If Gilead
exercises its option with respect to our TIGIT program, we are also eligible to
receive up to $500 million in potential U.S. regulatory approval milestones with
respect to domvanalimab (formerly referred to as AB154).

Upon Gilead's exercise of its option to a program, the two companies
will co-develop and equally share global development costs, subject to certain
of our opt-out rights, expense caps on our spending and true-up adjustments. For
each optioned program, provided we have not exercised our opt-out rights, we
have an option to co-promote in the United States with equal sharing of related
profits and losses. Gilead has the right to exclusively commercialize any
optioned programs outside of the U.S., subject to the rights of our existing
partners to any territories, and Gilead will pay to us tiered royalties as a
percentage of revenues ranging from the high teens to the low twenties. Gilead
will further provide ongoing research and development support of up to
$400 million over the collaboration term.

Pursuant to the Purchase Agreement and the Investor Rights Agreement, Gilead has
the right, at its option, to purchase additional shares from us, up to a maximum
of 35% of our then-outstanding voting common stock, from time to time over the
next five years, at a purchase price equal to the greater of a 20% premium to
market (based on a trailing five-day average closing price) at the time Gilead
exercises such option, and the $33.54 initial purchase price. The Investor
Rights Agreement also includes a three-year standstill and a two-year lockup and
provides Gilead with registration rights commencing at the end of the lockup
period, pro rata participation rights in certain future financings and the right
to designate two individuals to be appointed to our Board of Directors.

COVID-19 Pandemic



The degree to which COVID-19 impacts our business operations, research and
development programs and financial condition will depend on future developments,
including new information which may emerge concerning the duration and/or
severity of the outbreak and any resurgences, actions by government authorities
to contain the spread of the virus, and when and to what extent normal economic
and operating conditions can resume. Our management is actively monitoring this
health crisis and its effects on our operations, key vendors and workforce.

In mid-March, we voluntarily transitioned our employees, including our
laboratory-based personnel, to work-from-home prior to the institution of state
and local shelter-in-place orders. Most of our non-laboratory operations,
including the conduct and management of our clinical trials and the contract
manufacturing organizations engaged in CMC activities on our behalf, were easily
and quickly transitioned to remote work arrangements. However, we were not able
to transition our laboratory operations to work-from-home and only arranged for
limited outsourcing of our discovery activities to third-party research
organizations. In late June, we began to transition our laboratory-based
personnel back into our facilities; however, our laboratories are operating at
reduced capacity due to employee safety measures, such as social distancing
requirements and shift work. Our non-laboratory-based personnel continue to work
remotely.

Entering 2020, we anticipated that our discovery-stage programs would lead to
the advancement of two new molecules into clinical studies in the first quarter
of 2021. Based upon current timelines, the first program that we expect to
advance into clinical studies remains on-track to meet this objective. The
suspension of our laboratory operations has delayed the advancement of the
second of these two discovery-stage programs into clinical studies; however, the
magnitude of this delay is not yet known.

Despite the public health and mandatory self-quarantine measures in force during
the second quarter, we continued to see relatively robust enrollment across our
ongoing Arcus-sponsored studies. However, we continue to expect that this
pandemic will result in delays to some of our clinical programs, particularly in
initiating new studies and/or new investigational sites due to diversion of
their resources away from necessary start-up activities, and by limiting the
ability of investigational sites to conduct all activities associated with our
ongoing studies. For example, the circumstances may hinder their ability to
screen patients for enrollment. We are collaborating with our investigational
sites to implement measures to minimize disruptions to patients and ensure
continued access to treatment, in accordance with health authority guidance.

With respect to manufacturing and supply, we believe we currently have sufficient drug supply for our ongoing clinical studies. Our third-party contract manufacturers continue to operate at or near normal levels and, at this time and subject to further COVID-19 implications, we do not anticipate any disruptions to our drug supply chain.



The full impact of the COVID-19 outbreak continues to evolve and is highly
uncertain and subject to change. In connection with our resumption of laboratory
operations, we instituted regular COVID-19 testing services in order to minimize
the risk to our employees. These additional operating costs, along with the
absence of any furlough or measures to reduce personnel costs despite reduced
laboratory capacity, will have a negative impact on our operations and financial
condition. We do not expect the forward impact will be material due to
adjustments in operations that we have made. However, there are many
uncertainties around the COVID pandemic and future developments, which are
unpredictable, may result in a material, negative impact to our operations and
financial condition.

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Components of Operating Results

Collaboration and License Revenue



Under the Taiho Agreement, we recognize revenue from the upfront and annual
payments for research and development services performed by us to develop our
investigational products and from option exercise payments upon Taiho's exercise
of options during the Option Period.

Operating Expenses

Research and Development Expenses



Our research and development expenses consist of expenses incurred in connection
with the research and development of our pipeline programs. These expenses
include payroll and personnel expenses, including stock-based compensation for
our employees, laboratory supplies, product licenses, consulting costs, contract
research, pre-clinical and clinical expenses, and depreciation. We expense both
internal and external research and development costs as they are incurred. We
record advance payments for services that will be used or rendered for future
research and development activities as prepaid expenses and recognize them as an
expense as the related services are performed.

We do not allocate our costs by investigational product, as a significant amount
of research and development expenses include internal costs, such as payroll and
other personnel expenses, and certain external costs that are not recorded at
the investigational product level. In particular, with respect to internal
costs, several of our departments support multiple research and development
programs, and we do not allocate those costs by investigational product.

We expect our research and development expenses to increase substantially during
the next few years due to our Gilead collaboration and as we seek to complete
existing clinical trials and advance our programs into later-stage clinical
trials, pursue regulatory approval for our investigational products, and advance
other programs into the clinic. Later-stage clinical trials typically include a
larger number of subjects, are of a longer duration and include more geographic
regions. As we advance our clinical-stage programs and prepare to seek
regulatory approval, we will also need to conduct certain validation activities
with respect to our manufacturing processes for the investigational products in
each program. Moreover, in order to maximize the potential of our collaboration
with Gilead, we believe it will be important to grow our discovery capabilities
and pipeline. As a result, we expect our preclinical, clinical, and contract
manufacturing expenses to increase significantly relative to what we have
incurred to date. The level of our future research and development investment
will depend on a number of factors and uncertainties, including clinical
outcomes from our ongoing clinical trials, whether our collaborators opt into
any of our programs, the amount of opt-in and milestone payments we receive from
our collaborators, and the breadth of any joint development program agreed to
with Gilead for programs they opt into. In addition, under our license
agreements with WuXi Biologics (Cayman) Inc. (WuXi Biologics) and Abmuno
Therapeutics LLC (Abmuno), and our co-development and collaboration agreement
with Strata Oncology, Inc. (Strata), we may be required to pay additional
clinical and regulatory milestone payments based on the development progress of
zimberelimab and domvanalimab (formerly known as AB154). Therefore, we are
unable to predict the timing or the final cost to complete our clinical programs
or validation of our manufacturing and supply processes and delays may occur due
to numerous factors. Factors that could cause or contribute to delays or
additional costs include, but are not limited to, those discussed in "Risk
Factors."

General and Administrative Expenses



General and administrative expenses consist principally of personnel-related
costs including payroll and stock-based compensation for personnel in executive,
finance, human resources, information technology, business and corporate
development, and other administrative functions. Our general and administrative
expenses also include professional fees for legal, consulting, and accounting
services, rent and other facilities costs, fixed asset depreciation, and other
general operating expenses not otherwise classified as research and development
expenses.

We anticipate that our general and administrative expenses will increase
substantially during the next few years as we support our growing research and
development activities, including due to staff expansion, additional occupancy
costs, and other costs associated with increased infrastructure needs.

Interest and Other Income, Net

Interest and other income, net consists primarily of interest earned on our investments in fixed-income marketable securities.

Gain on Deemed Sale from Equity Method Investee



Gain on deemed sale from equity method investee consists of a gain related to
the dilution of our investment in PACT Pharma, Inc. (PACT Pharma) occurring upon
PACT Pharma's new issuances of equity securities in which we do not participate
on a pro rata basis or at all.

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Share of Loss from Equity Method Investee

Share of loss from equity method investee consists of our share of loss recorded in connection with our equity method investment in PACT Pharma, Inc. (PACT Pharma).

Critical Accounting Policies, Significant Judgments and Use of Estimates



Our condensed consolidated financial statements have been prepared in accordance
with U.S. generally accepted accounting principles (GAAP). The preparation of
these condensed consolidated financial statements requires us to make estimates
and assumptions that affect the reported amounts of assets and liabilities and
the disclosure of contingent assets and liabilities at the date of the condensed
consolidated financial statements, as well as the reported revenue and 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 relating to
revenue recognition, clinical trial accruals and stock-based compensation
reflect the more significant estimates and assumptions used in the preparation
of our condensed consolidated financial statements.

There have been no significant changes in our critical accounting policies and
estimates during the six months ended June 30, 2020, as compared to the critical
accounting policies and estimates disclosed in "Management's Discussion and
Analysis of Financial Condition and Results of Operations" included in our
Annual Report on Form 10-K for the year ended December 31, 2019 and more fully
described in Note 2 of the accompanying condensed consolidated financial
statements.

Results of Operations

Three Months Ended June 30, 2020 and 2019

The following table summarizes our results of operations for the three months ended June 30, 2020 and 2019 (in thousands):



                                               Three Months Ended June 30,                 Change
                                                2020                 2019              $             %
Collaboration and license revenue          $        1,750       $        1,750     $       -             0 %
Operating expenses:
Research and development                           35,693               24,999        10,694            43 %
General and administrative                         11,432                5,911         5,521            93 %
Loss from operations                              (45,375 )            (29,160 )     (16,215 )          56 %
Non-operating income (expense):
Interest and other income, net                        301                1,482        (1,181 )         -80 %
Gain on deemed sale from equity method
investee                                              131                    -           131             *
Share of loss from equity method
investee                                             (131 )               (412 )         281           -68 %
Total non-operating income, net                       301                1,070          (769 )         -72 %
Net loss                                   $      (45,074 )     $      (28,090 )   $ (16,984 )          60 %



*Not meaningful

Collaboration and License Revenue



Collaboration and license revenue was $1.8 million for the three months ended
June 30, 2020 and 2019 and relates to our license and collaboration agreement
with Taiho.

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Research and Development Expenses



Research and development expenses increased $10.7 million, or 43%, from $25.0
million for the three months ended June 30, 2019 to $35.7 million for the three
months ended June 30, 2020. The increase in research and development expenses
was due to a $6.3 million increase in manufacturing costs required to supply our
clinical studies, an increase of $3.8 million in clinical costs for our ongoing
clinical studies, and an increase of $3.9 million in employee compensation costs
primarily due to additional headcount, approximately $1.5 million of which
consists of non-cash stock-based compensation. Those increases were partially
offset by a decrease of $2.5 million due to the achievement of certain
development milestones which resulted in expenses of $5.0 million pursuant to
the terms of our WuXi Agreement, compared to a $7.5 million milestone payment to
WuXi that was recorded in the same period in the prior year. We also saw a
decrease of $1.2 million in lab supplies and equipment due to decreased lab
activities caused by shelter-in-place orders amid the COVID pandemic.

General and Administrative Expenses



General and administrative expenses increased $5.5 million, or 93%, from $5.9
million for the three months ended June 30, 2019 to $11.4 million for the three
months ended June 30, 2020. The increase in general and administrative expenses
was due to $2.0 million in legal and accounting expenses largely incurred as a
result of our collaboration agreement with Gilead, as well as $1.9 million in
consulting expenses driven largely by corporate development activities. We also
incurred increased expense of $1.3 million in employee compensation costs
primarily due to additional headcount, approximately $0.8 million of which
consists of non-cash stock-based compensation.

Interest and Other Income, Net



Interest and other income, net decreased $1.2 million or 80%, from $1.5 million
for the three months ended June 30, 2019 to $0.3 million for the three months
ended June 30, 2020. The decrease was primarily due to lower interest income
resulting from lower investment yields on our portfolio of marketable
fixed-income securities and lower average cash and investment balances in the
three months ended June 30, 2020 as compared to the same period in the prior
year.

Gain on Deemed Sale from Equity Method Investee

Gain on deemed sale from equity method investee was $0.1 million for the three months ended June 30, 2020 due to a gain recorded in connection with PACT Pharma's Series C-1 preferred financing in June 2020 in which we did not participate.

Share of Loss from Equity Method Investee



Share of loss from equity method investee was $0.1 million for each of the three
months ended June 30, 2020 and 2019 due to equity method losses resulting from
PACT's expanding operations.

Six Months Ended June 30, 2020 and 2019

The following table summarizes our results of operations for the six months ended June 30, 2020 and 2019 (in thousands):



                                             Six Months Ended June 30,      

Change


                                               2020               2019            $             %

Collaboration and license revenue $ 3,500 $ 3,500

  $       -             0 %
Operating expenses:
Research and development                          58,835           40,553        18,282            45 %
General and administrative                        18,440           10,879         7,561            70 %
Loss from operations                             (73,775 )        (47,932 )     (25,843 )          54 %
Non-operating income (expense):
Interest and other income, net                       948            3,016        (2,068 )         -69 %
Gain on deemed sale from equity method
investee                                             613                -           613             *
Share of loss from equity method
investee                                            (613 )           (844 )         231           -27 %
Total non-operating income, net                      948            2,172        (1,224 )         -56 %
Net loss                                   $     (72,827 )     $  (45,760 )   $ (27,067 )          59 %



*Not meaningful

Collaboration and License Revenue



Collaboration and license revenue was $3.5 million for the six months ended June
30, 2020 and 2019 and relates to our license and collaboration agreement with
Taiho.

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Research and Development Expenses



Research and development expenses increased $18.2 million, or 45%, from $40.6
million for the six months ended June 30, 2019 to $58.8 million for the six
months ended June 30, 2020. The increase in research and development expenses
was due to an increase of $8.5 million in clinical costs for our ongoing
clinical studies, an increase of $6.9 million in employee compensation costs
primarily due to additional headcount, approximately $2.4 million of which
consists of non-cash stock-based compensation, and a $5.9 million increase in
manufacturing costs required to supply our clinical studies. Those increases
were partially offset by a decrease of $2.5 million due to the achievement of
certain development milestones which resulted in expenses of $5.0 million
pursuant to the terms of our WuXi Agreement, compared to a $7.5 million
milestone payment to WuXi that was recorded in the same period in the prior
year. We also saw a decrease of $1.4 million in lab supplies and equipment due
to decreased lab activities caused by shelter-in-place orders amid the COVID
pandemic.

General and Administrative Expenses



General and administrative expenses increased $7.5 million, or 70%, from $10.9
million for the six months ended June 30, 2019 to $18.4 million for the six
months ended June 30, 2020. The increase in general and administrative expenses
was due to $2.3 million in legal and accounting expenses largely incurred as a
result of our collaboration agreement with Gilead, as well as $2.4 million in
consulting expenses driven largely by corporate development activities. We also
incurred increased expense of $2.4 million in employee compensation costs
primarily due to additional headcount, approximately $1.7 million of which
consists of non-cash stock-based compensation, and a $0.5 million increase in
expenses driven by investments in information technology and network security.

Interest and Other Income, Net



Interest and other income, net decreased $2.1 million or 69%, from $3.0 million
for the six months ended June 30, 2019 to $0.9 million for the six months ended
June 30, 2020. The decrease was primarily due to lower interest income resulting
from lower investment yields on our portfolio of marketable fixed-income
securities and lower average cash and investment balances during the six months
ended June 30, 2020 as compared to the same period in the prior year.

Gain on Deemed Sale from Equity Method Investee



Gain on deemed sale from equity method investee was $0.6 million for the six
months ended June 30, 2020 due to gains recorded in connection with PACT
Pharma's Series C and Series C-1 preferred financings in January 2020 and June
2020, respectively, in which we did not participate.

Share of Loss from Equity Method Investee



Share of loss from equity method investee was $0.6 million and $0.8 million for
the six months ended June 30, 2020 and 2019, respectively, due to equity method
losses resulting from PACT's expanding operations.

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Liquidity and Capital Resources



To date, we have financed our operations primarily through net proceeds of
$226.2 million from private placements of convertible preferred stock, $46.0
million in proceeds from the Taiho Agreement, net proceeds of $124.7 million
from our initial public offering of our common stock in March 2018, and $326.2
million of net proceeds in our May 2020 Public Offering. As of June 30, 2020, we
had $462.5 million of cash, cash equivalents, and investments in marketable
securities. Our cash and investments are held in a variety of interest-bearing
instruments, including money market funds, U.S. government treasury obligations,
U.S. government agency securities, and investments in corporate securities. In
addition, in July 2020 we received $375.0 million from Gilead upon the closing
of the transactions under the Collaboration Agreement and Purchase Agreement
with Gilead.

Based on our existing business plan, we believe that our existing cash, cash
investments, and short-term investments will be sufficient to fund our planned
level of operations through at least the next 12 months following the filing
date of this report.

We may require additional capital to complete the development and any commercialization of our investigational products. Our future capital requirements will depend on many factors, including:

• the scope, rate of progress and costs of our drug discovery, preclinical


        development activities, laboratory testing and clinical trials for our
        investigational products;


  • the number and scope of clinical programs we decide to pursue;


    •   the scope and costs of manufacturing development and commercial
        manufacturing activities;

• the timing and amount of programs Gilead exercises its option to, and the


        costs associated with our share of the global development plan for such
        optioned programs;


    •   the timing and amount of milestone payments we receive under the Taiho
        Agreement and Gilead Collaboration Agreement, and option fees under the
        Gilead Collaboration Agreement;

• the extent to which we acquire or in-license other investigational

products and technologies;

• the cost, timing and outcome of regulatory review of our investigational

products;

• the cost and timing of establishing sales and marketing capabilities, if

any of our investigational products receive marketing approval;

• the costs of preparing, filing and prosecuting patent applications,

maintaining and enforcing our intellectual property rights and defending

intellectual property-related claims;

• our ability to establish and maintain collaborations on favorable terms,

if at all;

• our efforts to enhance operational systems and our ability to attract,


        hire and retain qualified personnel, including personnel to support the
        development of our investigational products;


  • the costs associated with being a public company; and


• the cost associated with commercializing our investigational products, if

they receive marketing approval.




If we raise additional funds by issuing equity securities, our stockholders may
experience dilution. Any future debt financing into which we enter may impose
upon us additional covenants that restrict our operations, including limitations
on our ability to incur liens or additional debt, pay dividends, repurchase our
common stock, make certain investments and engage in certain merger,
consolidation or asset sale transactions. Any debt financing or additional
equity that we raise may contain terms that are not favorable to us or our
stockholders. If we are unable to raise additional funds when needed, we may be
required to delay, reduce, or terminate some or all of our development programs
and clinical trials. We may also be required to sell or license to others rights
to our investigational products in certain territories or indications that we
would prefer to develop and commercialize ourselves.

See "Risk Factors" for additional risks associated with our substantial capital requirements.



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