The following discussion and analysis should be read in conjunction with our
financial statements and related notes included elsewhere in this Annual Report
on Form 10-K. This discussion contains forward-looking statements that reflect
our plans, estimates and beliefs and involve numerous risks and uncertainties,
including but not limited to those described in the "Risk Factors" section of
this Annual Report. Actual results may differ materially from those contained in
any forward-looking statements. You should carefully read "Forward-Looking
Statements" and "Risk Factors."

Overview



We are an integrated discovery through clinical development biopharmaceutical
company, with a focus on developing therapeutics that target the dysregulated
transcription that causes cancer and other serious diseases. We are enrolling
patients in clinical trials for two compounds. Our product engine, which
includes our proprietary small molecule microarray (SMM) screening platform,
provides us with the capability to map and target transcription regulatory
networks (TRNs) in a differentiated manner to enable discovery of novel
compounds and improve our ability to discover and optimize clinical development
candidates. In addition to our own internal preclinical programs, we have
entered into a collaboration agreement with Genentech, Inc., a member of the
Roche Group (Genentech).

We are developing KB-0742, our internally discovered, oral cyclin dependent
kinase 9 (CDK9) inhibitor, for the treatment of MYC-amplified and other
transcriptionally addicted solid tumors. We have initiated the Phase 2 portion
of our Phase 1/2 clinical trial. KB-0742 was generated from our optimization of
a compound that was identified using our SMM platform.

We are also developing lanraplenib, our next generation orally-administered SYK
inhibitor, and are in the dose escalation stage of our Phase 1b/2 clinical
trial. This clinical trial will evaluate lanraplenib in combination with
gilteritinib in patients with relapsed or refractory FLT3- mutated AML.
Lanraplenib has multiple advantages over our first-generation SYK inhibitor,
entospletinib. In November 2022, we announced the decision to close enrollment
of our Phase 3 clinical trial of entospletinib in combination with intensive
chemotherapy in patients with newly diagnosed NPM-1 mutated AML for strategic
reasons, and study closure is anticipated in mid-2023.

In our research efforts, we are leveraging our product engine to drive multiple
oncology discovery programs targeting dysregulated transcription factors and
their associated TRNs. Some of the most powerful oncogenes in all of human
cancer encode transcription factors: proteins that bind to specific DNA
sequences on the genome and control how sets of genes are turned on and off.
Transcription factors historically have been difficult to target in drug
development because they are typically intrinsically disordered, adopting a
functional structure only when assembled with a complex of cofactors in the
nucleus on the genome. Transcription factors with aberrant expression or
activity result in dysregulated TRNs, which are frequently responsible for
reprogramming healthy cells into cancerous tumor cells. Therapeutically
modulating dysregulated transcription factors requires a sophisticated and
holistic approach due to their complexity and their regulation of complex TRNs
in a context-dependent manner. Based on this work, in November 2021, we
announced the advancement of two programs, one focused on the MYC TRN and one
focused on the androgen receptor (AR) TRN, which we are continuing to advance.

In addition, in January 2023, we entered into a research collaboration with Genentech, focused on discovering and developing small-molecule drugs that modulate transcription factor targets selected by Genentech. Under the collaboration, we will leverage our proprietary drug discovery platform, including the small molecule microarray, for hit finding, to build upon research conducted by Genentech.



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Since our formation, we have incurred significant operating losses, primarily
from costs incurred in connection with research and development activities and
general and administrative costs associated with our operations. Our net losses
were $133.2 million and $151.1 million for the years ended December 31, 2022 and
2021, respectively. As of December 31, 2022, we had an accumulated deficit of
$396.2 million. As of December 31, 2022, we had $247.9 million of cash, cash
equivalents and investments. We expect to continue to incur net losses for the
foreseeable future, and we expect to continue to make significant investments in
research and development, general and administrative and capital expenditures.


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Strategic Agreements

Genentech Collaboration Agreement



On January 6, 2023, we entered into a Collaboration and License Agreement with
Genentech, a member of the Roche Group. Pursuant to the agreement, the parties
have agreed to initially collaborate on two discovery research programs in
oncology, each focused on a designated transcription factor, to discover
small-molecule GLP-Tox-ready candidates that modulate transcription factor
targets selected by Genentech. Each discovery research program will primarily
consist of (i) a mapping phase with the goal of identifying the transcription
regulatory network for such designated transcription factor, and (ii) a
screening phase having the goal of identifying and characterizing multiple
screening hits suitable for nomination as a preclinical development program.

We will lead discovery and research activities under the discovery research
programs and will use our proprietary drug discovery platform, including our
SMM, for hit finding. Following the completion of initial discovery and research
activities, Genentech will have the exclusive right to pursue further
preclinical and clinical development and commercialization of compounds
identified in the discovery research programs and designated by Genentech (each,
a Hit Program).

In connection with the agreement, we received an upfront payment of $20.0
million from Genentech. In addition, we are eligible for additional milestone
payments upon achievement of certain preclinical, clinical and regulatory
(including first-sale) milestones, totaling up to $177.0 million for the first
development candidate per hit program, and are eligible to receive net sales
milestones of up to $100.0 million for the first licensed product per hit
program. We are also eligible to receive tiered royalties in the low- to
high-single digits on any products that are commercialized by Genentech as a
result of the collaboration.

The term of the discovery research programs will be up to 24 months, which may be extended by six months at our option subject to satisfying certain conditions.

Tempus R&D Services Agreement



In October 2021, we entered into an agreement for research and development
services (Tempus Agreement) with Tempus Labs, Inc. (Tempus), pursuant to which
Tempus agreed to provide us with research and development services for a period
of three years. The three primary services are analytical services, data
licensing, and organoid services. We intend to utilize the services contemplated
under the Tempus Agreement to advance the development of KB-0742 and
lanraplenib.

In consideration for the access to the services throughout the term of the
Tempus Agreement, we have agreed to pay an annual minimum commitment of $1.5
million in year one, $2.0 million in year two, and $2.5 million in year three.
Payments are made in quarterly installments. As of December 31, 2022, we have
paid $1.1 million under the Tempus Agreement.

In addition, we are required to make milestone payments upon successful
achievement of certain regulatory milestones for KB-0742, lanraplenib, and other
discovery pipeline compounds up to a combined maximum of $22.4 million. For each
milestone payment that becomes due, we have the right to pay up to 50% of such
milestone payment amount in shares of our common stock as long as certain
regulatory requirements are met.

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Gilead Asset Purchase Agreement



In July 2020, we entered into the Gilead Asset Purchase Agreement, pursuant to
which we acquired certain assets from and assumed certain liabilities of Gilead
related to lanraplenib or entospletinib, and patents and other intellectual
property covering or related to the development, manufacture and
commercialization of lanraplenib or entospletinib.

In consideration for such assets, on the date of the Gilead Asset Purchase
Agreement, we made a $3.0 million upfront cash payment and issued a $3.0 million
principal amount convertible promissory note, which was settled in exchange for
188,567 shares of common stock in connection with the closing of our IPO at a
settlement price of $16.15 per share. We also made a $0.7 million payment to
reimburse Gilead for certain liabilities we assumed pursuant to the Gilead Asset
Purchase Agreement. In addition, we are required to make milestone payments upon
successful achievement of certain regulatory and sales milestones for
lanraplenib, entospletinib and other SYK inhibitor compounds covered by the
patent rights acquired pursuant to the Gilead Asset Purchase Agreement and
developed by us as a back-up to entospletinib or lanraplenib (Other Compounds).
Upon successful completion of certain regulatory milestones in the United
States, European Union and United Kingdom for lanraplenib, entospletinib and any
Other Compounds, across up to two distinct indications, we will be required to
pay to Gilead an aggregate total of $51.3 million. Upon achieving certain
thresholds for the aggregate annual net sales of lanraplenib, entospletinib, and
any Other Compounds combined, we would owe to Gilead potential milestone
payments totaling $115.0 million. For the year ended December 31, 2022, there
have been no milestone payments made to Gilead. As of December 31, 2021, we made
a $29.0 million milestone payment to Gilead which became payable upon initiation
of our registrational Phase 3 clinical trial of entospletinib in combination
with induction chemotherapy in acute myeloid leukemia patients with NPM1
mutations.

Gilead is also eligible to receive (i) tiered marginal royalties ranging from
high-single digits to the mid-teens on annual worldwide net sales of
lanraplenib, (ii) tiered marginal royalties ranging from the very low-teens to
high-teens on annual worldwide net sales of entospletinib, and (iii) tiered
marginal royalties ranging from the low single digits to mid-single digits on
annual worldwide net sales of any Other Compounds. The royalties in the
foregoing clauses are subject to reduction, on a country-by-country basis, for
products not covered by certain claims within the assigned patents, for generic
entry and, in the case of lanraplenib and entospletinib, for any royalties paid
for future licenses of third-party intellectual property required to develop or
commercialize lanraplenib or entospletinib. Our royalty obligation with respect
to a given product in a given country begins upon the first commercial sale of
such product in such country and ends on the latest of (i) expiration of the
last claim of a defined set of the assigned patent rights covering such product
in such country, (ii) loss of exclusive data or marketing rights to such product
in such country or (iii) 10 years from the first commercial sale of such product
in such country.

Under the Gilead Asset Purchase Agreement, we are required to use commercially
reasonable efforts to develop, obtain regulatory approval for and commercialize
either lanraplenib or entospletinib.

Harvard License Agreement



In January 2018, we entered into a license agreement with President and Fellows
of Harvard College (Harvard), pursuant to which Harvard granted us a
non-exclusive, worldwide, royalty-free license to certain patent rights covering
aspects of our SMM platform. We paid a one-time license fee in the amount of
$10,000 on the date of the agreement and an annual license maintenance fee of
$20,000 on each of the first two anniversaries. We are required to pay $25,000
on each subsequent anniversary until the last to expire of any valid claim
included in the licensed patents.



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Components of Our Results of Operations

Operating Expenses

Our operating expenses consisted of research and development expenses and general and administrative expenses.

Research and Development Expenses



Our research and development expenses consist primarily of direct and indirect
costs incurred in connection with our therapeutic discovery efforts and the
preclinical and clinical development of our product candidates, as well as the
development of our product engine.

Direct costs include:

•expenses incurred under agreements with contract research organizations (CROs) and other vendors that conduct our clinical trials and preclinical activities;

•costs of outside consultants, including their fees, stock-based compensation and related travel expenses;

•costs of acquiring, developing, and manufacturing clinical trial materials and lab supplies; and

•payments made under third-party strategic agreements.

Indirect costs include:



•personnel costs, which include salaries, benefits, and other employee related
costs, including stock-based compensation, for personnel engaged in research and
development functions;

•costs related to compliance with regulatory requirements; and



•facilities costs, depreciation and other expenses, which include direct and
allocated expenses for rent and maintenance of facilities, insurance and other
supplies.

We expense research and development costs as the services are performed or the
goods are received. We recognize costs for certain development activities based
on an evaluation of the progress to completion of specific tasks using
information provided to us by our vendors and our internal management. Payments
for these activities are based on the terms of the individual agreements, which
may differ from the pattern of costs incurred, and are reflected in our
financial statements as prepaid or accrued research and development expenses.

Because we are working on multiple research and development programs at any one
time, we intend to track our direct costs by the stage of program, clinical or
preclinical. However, our internal costs, employees and infrastructure are not
directly tied to any one program and are deployed across multiple programs. As
such, we do not track indirect costs on a specific program basis.

Our research and development expenses may vary significantly based on a variety of factors, such as:

•the scope, rate of progress, and results of our preclinical development activities;

•per patient trial costs;

•the number of trials required for approval;

•the number of sites included in the trials;

•the number of patients that participate in the trials;

•the countries in which the trials are conducted;

•uncertainties in clinical trial design and patient enrollment or drop out or discontinuation rates;

•potential additional safety monitoring requested by regulatory agencies;


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•the duration of patient participation in the trials and follow-up;

•the safety and efficacy of our product candidates;

•the timing, receipt, and terms of any approvals from applicable regulatory authorities including the FDA and non-U.S. regulators;

•significant and changing government regulation and regulatory guidance;

•potential additional trials requested by regulatory agencies;



•establishing clinical and commercial manufacturing capabilities or making
arrangements with third-party manufacturers in order to ensure that we or our
third-party manufacturers are able to make product successfully;

•the extent to which we establish additional strategic collaborations or other arrangements;

•the impact of any business interruptions to our operations or to those of the third parties with whom we work; and

•maintaining a continued acceptable safety profile of our product candidates following approval, if any, of our product candidates.

A change in the outcome of any of these variables with respect to the development of any of our product candidates could significantly change the costs and timing associated with the development of that product candidate.



We expect to continue to make significant investments into research and
development for the foreseeable future as we continue to identify and develop
additional product candidates and as more of our product candidates move into
later stages of clinical development, which typically have higher development
costs than those in earlier stages of clinical development due to the increased
size and duration of later-stage clinical trials.

The process of conducting the necessary preclinical and clinical research to
obtain regulatory approval is costly and time-consuming. The actual probability
of success for our product candidates may be affected by a variety of factors.
We may never succeed in achieving regulatory approval for any of our product
candidates. Further, a number of factors, including those outside of our
control, could adversely impact the timing and duration of our product
candidates' development, which could increase our research and development
expenses.

General and Administrative Expenses



General and administrative expenses consist primarily of personnel costs, which
include salaries, benefits and other employee related costs, such as stock-based
compensation, for personnel in our executive, finance, corporate and business
development, and administrative functions. General and administrative expenses
also include legal fees relating to patent and corporate matters; professional
fees for accounting, auditing, tax and consulting services; insurance costs;
recruiting costs; travel expenses; and facilities-related costs.

We expect to maintain the general and administrative function for the
foreseeable future to support personnel in research and development and to
support our operations generally as we execute on our research and development
activities. We also expect to continue to incur expenses associated with
operating as a public company, including costs of accounting, audit, legal,
regulatory and tax-related services associated with maintaining compliance with
exchange listing and SEC requirements, director and officer insurance costs, and
investor and public relations costs.

Interest and Other Income, Net

Interest and other income, net primarily consists of interest earned on our cash, cash equivalents and investments.

Results of Operations


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Comparison of Years Ended December 31, 2022 and 2021



The following table summarizes our results of operations for the years ended
December 31, 2022 and 2021:

                                         Year Ended December 31,            Change
                                          2022              2021         2022 vs 2021
                                                       (in thousands)
Operating expenses:
Research and development             $      93,715      $  112,903      $     (19,188)
General and administrative                  43,400          38,495              4,905
Total operating expenses                   137,115         151,398            (14,283)
Loss from operations                      (137,115)       (151,398)            14,283
Other income (expense), net:

Interest and other income, net               3,911             320          

3,591


Total other income (expense), net            3,911             320              3,591
Net loss                             $    (133,204)     $ (151,078)     $      17,874

Research and Development Expenses

The following table summarizes our research and development expenses for the years ended December 31, 2022 and 2021:



                                                                     Year Ended December 31,                 Change
                                                                  2022                   2021             2022 vs 2021
                                                                                  (in thousands)
Direct Costs(1)                                           $     50,142               $  74,640          $     (24,498)
Indirect Costs:
Personnel                                                       35,734                  30,819                  4,915
Facilities, depreciation and other expenses(1)                   7,839                   7,444                    395
Total research and development expenses                   $     93,715

$ 112,903 $ (19,188)




(1) Certain costs have been reclassified from Facilities, depreciation and other
expenses to Direct Costs, and the prior period amounts have been adjusted by
$6.1 million for comparison purposes.


Research and development expenses were $93.7 million for the year ended
December 31, 2022, compared to $112.9 million for the year ended December 31,
2021. The decrease of $19.2 million was primarily due to a decrease in Direct
Costs related to a $29.0 million milestone payment in prior year with no
associated milestone payment in the current year, partially offset by an
increase in outside and consulting research expenses of $5.0 million related to
an increase in research and development activities and increases in personnel
costs of $3.2 million and stock-based compensation of $1.8 million, both of
which are primarily attributable to increased research and development personnel
headcount.

General and Administrative Expenses



General and administrative expenses were $43.4 million for the year ended
December 31, 2022 compared to $38.5 million for the year ended December 31,
2021. The increase of $4.9 million was primarily due to an increase in
stock-based compensation of $3.1 million and an increase of $2.4 million in
personnel costs, both of which are primarily attributable to increased general
and administrative personnel headcount. The increase in general and
administrative expenses was partially offset by a decrease of $0.9 million in
professional fees, primarily attributable to lower insurance, legal and outside
consultant costs.

Interest and Other Income, Net



Interest and other income, net was $3.9 million and $0.3 million for the years
ended December 31, 2022 and 2021, respectively. The $3.6 million increase was
due to higher interest rates during the twelve months ended December 31, 2022.

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Liquidity and Capital Resources

Sources of Liquidity



To date, we have incurred significant operating losses and negative cash flows
from operations. We have not yet commercialized any products and we do not
expect to generate revenue from sales of any product candidates for several
years, if ever. Prior to our IPO, our operations were financed primarily by net
proceeds from the sale and issuance of our convertible preferred stock and
convertible notes, totaling aggregate gross proceeds of $278.2 million. Upon
completion of our IPO on October 14, 2020, we sold an aggregate of 15,131,579
shares of our common stock including 1,973,684 shares of common stock sold
pursuant to the full exercise of the underwriters' option to purchase additional
shares at a price of $19.00 per share and received approximately $263.7 million
in net proceeds after deducting underwriting discounts and commissions and
offering expenses.

As of December 31, 2022, we had cash, cash equivalents and investments of $247.9
million. We expect that our cash, cash equivalents and investments as of
December 31, 2022, will enable us to fund our planned operating expenses and
capital expenditure requirements into the second half of 2025.

Material Cash Requirements



Our primary use of cash is to fund operating expenses, which consist primarily
of research and development expenditures related KB-0742 and lanraplenib, the
wind-down of the entospletinib trial and our other research efforts, 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 accounts payable and accrued
expenses.

Our product candidates are still in the early stages of clinical and preclinical
development, and the outcomes of these efforts are uncertain. Accordingly, we
cannot estimate the actual amounts necessary to successfully complete the
development and commercialization of our product candidates or whether, or when,
we may achieve profitability. Until such time, if ever, as we can generate
substantial product revenue, we expect to finance our cash needs through a
combination of equity or debt financings and collaboration agreements. 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 existing 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. If we are unable to raise capital
when needed, we will need to delay, reduce or terminate planned activities to
reduce costs. Doing so will likely harm our ability to execute our business
plans.

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Cash Flows



The following table summarizes our sources and uses of cash for each of the
periods presented:

                                                       Year Ended December 31,
                                                        2022              2021
                                                           (in thousands)
Cash used in operating activities                  $     (90,926)     $ 

(117,924)

Cash provided by (used in) investing activities (32,222) 63,724 Cash provided by financing activities

                        851           

4,460

Net decrease in cash and cash equivalents $ (122,297) $ (49,740)




Operating Activities

During the year ended December 31, 2022, cash used in operating activities was
$90.9 million, which was primarily attributable to our net loss of $133.2
million and $6.2 million net cash provided by changes in our operating assets
and liabilities, partially offset by non-cash charges of $36.1 million. The
non-cash charges consisted of $31.1 million of stock-based compensation, $2.2
million of noncash lease expense, $2.3 million of depreciation and amortization,
and $1.0 million change in accrued interest on marketable securities, partially
offset by a decrease related to net amortization and accretion of investment
securities of $0.5 million. Net cash provided by changes in our operating assets
and liabilities during the year ended December 31, 2022 consisted of a decrease
of $2.7 million in right of use assets and liabilities, a decrease of $1.1
million in other long term assets, partially offset by, an increase of $1.6
million in prepaid and other current assets and an increase in accounts payable
and accrued expenses of $8.2 million. The decrease in right of use assets was
the result of regular amortization. The increase in accounts payable and accrued
expenses was primarily due to increases in accrued compensation and external
research and development costs.

During the year ended December 31, 2021, cash used in operating activities was
$117.9 million, which was primarily attributable to our net loss of $151.1
million, partially offset by non-cash charges of $34.8 million. The non-cash
charges primarily consisted of $26.2 million in stock-based compensation, net
amortization and accretion of investment securities of $4.0 million, noncash
lease expense of $2.1 million, depreciation and amortization of $2.0 million,
and cash used by changes in our operating assets and liabilities of $1.6
million. Net cash used by changes in our operating assets and liabilities of
$1.6 million during the year ended December 31, 2021 consisted of a decrease of
$2.3 million in other liabilities and a decrease of $1.0 million in prepaid and
other current assets partially offset by a net increase in accounts payable and
accrued expenses of $1.6 million and an increase of $0.1 million in other
assets. The decrease in other liabilities was primarily the result of an
decrease in the unvested early exercised share liability. The net increase in
accounts payable and accrued expenses was largely due to increases in accrued
compensation and external research and development costs

Investing Activities



During the year ended December 31, 2022, cash used in investing activities was
$32.2 million, consisting of $366.6 million of net purchases of marketable
securities and $0.6 million of purchases of property and equipment, partially
offset by $335.0 million in maturities of marketable securities.

During the year ended December 31, 2021, cash provided by investing activities
was $63.7 million, consisting of $226.2 million in maturities of marketable
securities, partially offset by net investment purchases of $158.3 million and
$4.3 million for the purchase of property and equipment.

Financing Activities

During the year ended December 31, 2022, net cash provided by financing activities was $0.9 million, consisting primarily of net proceeds from the issuance of common stock upon vesting and exercise of options of $0.5 million and issuance of common stock under the employee stock purchase plan of $0.4 million.

During the year ended December 31, 2021, net cash provided by financing activities was $4.5 million, consisting primarily of net proceeds from the issuance of common stock upon vesting and exercise of options of $3.1 million and issuance of common stock under the employee stock purchase of $1.3 million.


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Contractual Obligations and Commitments



In March 2020, we entered into a lease agreement for our research and
development operations facility at 301 Binney Street, Cambridge, Massachusetts
(Cambridge facility). The initial annual base rent was $4.1 million with rent
payments escalating 3.0% annually after the initial 12 payments. As discussed in
Note 2, we executed a letter of credit for $2.0 million in connection with the
lease. The remaining lease term is 8.2 years.

In February 2021, we entered into a new lease agreement for our office space in
San Mateo, California, in order to move from our former suites to a single,
larger suite totaling 17,340 square-feet, and relocated in the third quarter of
2021. We accounted for this change in lease term of the original suites as a
modification of the originally amended lease.

The initial annual base rent for the San Mateo facility was $1.2 million, and
such amount will increase by 3% annually on each anniversary of the new premises
commencement date. In connection with the larger space leased, we also made an
additional one-time cash security deposit in the amount of $59,000, bringing our
total security deposit to $0.1 million. The new lease commenced in April 2021
while tenant improvements were being made and the new lease agreement extended
the termination date from April 30, 2025 to August 31, 2026.

Pursuant to the Gilead Asset Purchase Agreement, we are obligated to make
milestone payments upon the achievement of specified regulatory and clinical
milestones as well as royalty payments. The payment obligations under this
agreement are contingent upon future events, such as our achievement of
specified milestones or generating product sales. We are currently unable to
estimate the timing or likelihood of achieving these milestones or generating
future product sales. See the subsection titled "-Strategic Agreements-Gilead
Asset Purchase Agreement" above.

Pursuant to the Tempus Agreement, we are obligated to make milestone payments
upon the achievement of specified regulatory milestones as well as annual
minimum commitments in quarterly installments. Some payment obligations under
this agreement are contingent upon future events, such as our achievement of
specified milestones. We are currently unable to estimate the timing or
likelihood of achieving these milestones. See the subsection titled "-Strategic
Agreements-Tempus R&D Services Agreement" above.

We enter into contracts in the ordinary course of business with CROs for
clinical trials, preclinical and clinical research studies and testing,
manufacturing and other services and products for operating purposes. These
contracts do not contain any minimum purchase commitments and are generally
terminable by us upon prior notice. Payments due upon termination generally
consist only of payments for services provided and expenses incurred up to the
date of termination and certain wind down costs that may be associated with the
termination of a contract or clinical trial program.

Critical Accounting Policies and Estimates



Our management's discussion and analysis of financial condition and results of
operations is based on our financial statements, which have been prepared in
accordance with generally accepted accounting principles in the United States.
The preparation of our financial statements and related disclosures requires us
to make estimates and assumptions that affect the reported amounts of assets and
liabilities, costs and expenses and the disclosure of contingent assets and
liabilities in our financial statements. We base our estimates on historical
experience, known trends and events and various other factors that we believe
are reasonable under the circumstances, the results of which form the basis for
making judgments about the carrying values of assets and liabilities that are
not readily apparent from other sources. We evaluate our estimates and
assumptions on an ongoing basis. Our actual results may differ from these
estimates under different assumptions or conditions.

While our significant accounting policies and estimates are described in more
detail in the notes to our financial statements included elsewhere in this
Annual Report on Form 10-K, we consider the assumptions and estimates associated
with accrued research and development expenditures and stock-based compensation
to have the most significant impact on our financial statements and therefore we
consider these to be our critical accounting policies and estimates.

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Accrued Research and Development Expenses



As part of the process of preparing our financial statements, we are required to
estimate our accrued research and development and manufacturing expenses. This
process involves reviewing open contracts and purchase orders, communicating
with our personnel to identify services that have been performed on our behalf
and estimating the level of service performed and the associated costs incurred
for the services when we have not yet been invoiced or otherwise notified of the
actual costs. The majority of our service providers invoice us in arrears for
services performed on a pre-determined schedule or when contractual milestones
are met; however, some require advanced payments. We make estimates of our
accrued expenses as of each balance sheet date in our financial statements based
on facts and circumstances known to us at that time. Examples of estimated
accrued research and development expenses include fees paid to:

•CROs in connection with performing research activities on our behalf and conducting preclinical studies and clinical trials on our behalf;

•investigative sites or other service providers in connection with clinical trials;

•vendors in connection with preclinical and clinical development activities; and

•vendors related to product manufacturing and development and distribution of preclinical and clinical supplies.



We base our expenses related to preclinical studies and clinical trials on our
estimates of the services received and efforts expended pursuant to quotes and
contracts with multiple CROs that conduct and manage preclinical studies and
clinical trials on our behalf. The financial terms of these agreements are
subject to negotiation and vary from contract to contract, which may result in
uneven payment flows. There may be instances in which payments made to our
vendors will exceed the level of services provided and result in a prepayment of
the expense. Payments under some of these contracts depend on factors such as
the completion of scientific milestones. In accruing fees, we estimate the time
period over which services will be performed and the level of effort to be
expended in each period. If the actual timing of the performance of services or
the level of effort varies from our estimate, we adjust the accrual or amount of
prepaid expense accordingly. Although we do not expect our estimates to be
materially different from amounts actually incurred, our understanding of the
status and timing of services performed relative to the actual status and timing
of services performed may vary and may result in us reporting amounts that are
too high or too low in any particular period. To date, we have not made any
material adjustments to our prior estimates of accrued research and development
expenses.

Stock-Based Compensation

We measure stock options and other stock-based awards granted to employees,
directors, and non-employees based on their fair value on the date of grant and
recognize stock-based compensation expense of those awards over the requisite
service period, which is generally the vesting period of the respective award.
We recognize the impact of forfeitures on stock-based compensation expense as
forfeitures occur. We apply the straight-line method of expense recognition to
all awards with only service-based vesting conditions.

We estimate the fair value of each stock option grant on the date of grant using
the Black-Scholes option-pricing model. This model requires the use of highly
subjective assumptions to determine the fair value of stock-based awards,
including:

•Fair Value of Common Stock-For grants before the completion of our IPO in
October 2020 when we were a privately held company with no public market for our
common stock, the fair value of our common stock underlying share-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 option grants, our Board
of Directors considered, among other things, valuations 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 Accounts
Practice Guide, Valuation of Privately-Held-Company Equity Securities Issued as
Compensation. For all grants subsequent to our IPO in October 2020, the fair
value of common stock was determined by taking the closing price per share of
common stock as reported on the Nasdaq Stock Market.

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•Expected Term-The expected term represents the period that the stock-based
awards are expected to be outstanding. We use the simplified method to determine
the expected term, which is based on the average of the time-to-vesting and the
contractual life of the options.

•Expected Volatility-The expected volatility for the years ended December 31,
2022 and 2021 is estimated based on the average historical volatilities of
common stock of comparable publicly traded entities over a period equal to the
expected term of the stock option grants. The comparable companies are chosen
based on their size, stage in the product development cycle or area of
specialty. The Company 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 yield in effect at the time of grant for zero-coupon U.S. Treasury notes with maturities approximately equal to the expected term of the awards.

•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.



See Note 9 to our financial statements included elsewhere in this Annual Report
to Form 10-K for information concerning certain of the specific assumptions we
used in applying the Black-Scholes option-pricing model to determine the
estimated fair value of our stock options granted in the years ended
December 31, 2022 and 2021.

Recently Issued and Adopted Accounting Pronouncements



A description of recently issued accounting pronouncements that may potentially
impact our financial position and results of operations is provided in Note 2 to
our financial statements included elsewhere in Item 8 of Part II of this Annual
Report on Form 10-K.

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