The following discussion and analysis of our financial condition and results of
operations should be read in conjunction with our consolidated financial
statements and related notes appearing at the end of this Annual Report on Form
10-K. Some of the information contained in this discussion and analysis or set
forth elsewhere in this Annual Report on Form 10-K, including information with
respect to our plans and strategy for our business, includes forward-looking
statements that involve risks and uncertainties. As a result of many factors,
including those factors set forth in the "Risk Factors" section of this Annual
Report on Form 10-K, 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.

Unless otherwise indicated, references in this Management's Discussion and
Analysis of Financial Condition and Results of Operations section to "Tango,"
"we," "us," "our" and other similar terms refer to our wholly-owned subsidiary
Tango Therapeutics Sub, Inc. and its subsidiary prior to the closing of the
business combination with BCTG Acquisition Corp. and to Tango Therapeutics, Inc.
and its consolidated subsidiaries after giving effect to the Business
Combination.

Overview



We are a precision oncology company leveraging our state-of-the-art target
discovery platform to identify novel targets and develop new drugs directed at
tumor suppressor gene loss in defined patient populations with high unmet
medical need. Tumor suppressor gene loss remains a largely untouched target
space specifically because these genetic events cannot be directly targeted.
Empowered by recent advances in CRISPR technology, we are now able to employ a
unique functional genomics approach and apply the principles of synthetic
lethality to target the loss of specific tumor suppressor genes at scale. We
believe this will result in establishing a sustainable pipeline designed to
deliver meaningfully clinical benefit to patients. Our novel small molecules are
designed to be selectively active in cancer cells with specific tumor suppressor
gene loss, killing those cancer cells while being relatively inert in normal
cells. We also are extending this target space beyond the classic,
cell-autonomous effects of tumor suppressor gene loss to include the discovery
of novel targets that reverse the effects of tumor suppressor gene loss that
prevent the immune system from recognizing and killing cancer cells (immune
evasion). We believe this approach will provide the ability to deliver the deep,
sustained target inhibition necessary for prolonged tumor regression and
meaningful clinical benefit as a result of the unique ability of synthetic
lethal targeting to spare normal cells.

Our lead program, TNG908, a protein arginine methyl transferase 5, or PRMT5,
inhibitor is synthetic lethal with MTAP deletion, is being developed as a
treatment for cancers with MTAP deletions. MTAP deletions occur in 10% to 15% of
all human cancers. In preclinical studies, TNG908 demonstrated 15-fold greater
potency in cells with MTAP deletions than those without and showed strong
regressions in multiple cancer types. In the first quarter of 2022, the U.S.
Food and Drug Administration (FDA) cleared the Investigational New Drug (IND)
application for the Phase 1/2 clinical trial and granted Fast Track designation
to TNG908. We plan to initiate a Phase 1/2 clinical trial in the second quarter
of 2022. Our Target 3 program, an undisclosed synthetic lethal target, reverses
the immune evasion effect of serine-threonine kinase 11 (STK11) loss-of-function
mutations. In animal models, the combination of Target 3 with a PD1 inhibitor
sustained strong tumor regressions and the induction of immune memory against
re-implantation of tumors. We expect to advance a development candidate in the
second quarter of 2022 and file an IND in 2023. We are also developing a
ubiquitin-specific protease 1, or USP1, inhibitor that is synthetic lethal with
BRCA1 and BRCA2-mutant tumors. In vitro and in vivo preclinical data for USP1
demonstrated potent anti-tumor activity. We expect this molecule to have both
single agent activity in PARPi-naïve and PARPi-resistant BRCA1/2 mutant cancers
and to synergize with PARP inhibitors. We anticipate declaring a development
candidate in the second half of 2022 and filing an IND for this program in 2023.

Business Combination



On April 13, 2021, the Company, BCTG Merger Sub Inc., a Delaware corporation,
and Tango Therapeutics, Inc. (now known as Tango Therapeutics Sub, Inc., or "Old
Tango") signed a definitive merger agreement, or the Merger Agreement,
memorializing the terms of BCTG's acquisition of 100% of Old Tango's issued and
outstanding equity securities in exchange for $550.0 million worth of
consideration in the form of BCTG common stock, or the Business Combination. The
Business Combination was approved on August 9, 2021 by shareholders of BCTG,
resulting in BCTG acquiring 100% of our issued and outstanding equity securities
on August 10, 2021. Upon the closing of the Business Combination, BCTG Merger
Sub Inc. merged with and into Tango, with Tango as the surviving company in the
Merger, and BCTG changed its name to "Tango Therapeutics, Inc.", or New Tango.
For additional information on the Business Combination, see Note 3 to the
audited consolidated financial statements included elsewhere in this Annual
Report on Form 10-K.
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We received gross proceeds of $167.1 million upon the closing of the Business
Combination. Simultaneous with the closing of the Business Combination, Tango
entered into agreements with certain investors, the PIPE Investors, pursuant to
which these PIPE Investors purchased 18,610,000 shares of our common stock at
$10.00 per share, for aggregate gross proceeds of $186.1 million, upon the
closing of the PIPE financing. Total transaction costs and redemptions totaled
$26.9 million, resulting in total net proceeds of $326.3 million.

Subject to the terms of the Merger Agreement, at the effective time of the
Business Combination, each share of Old Tango redeemable convertible preferred
stock issued and outstanding immediately prior to the effective time of the
Business Combination was converted into a share of New Tango common stock. At
the effective time of the Business Combination, each option to purchase Old
Tango common stock became an option to purchase shares of New Tango common
stock, subject to adjustment in accordance with the exchange ratio.

Financial Overview



Since the Company's inception, we have focused primarily on organizing and
staffing our company, business planning, raising capital, discovering product
candidates, securing related intellectual property, and conducting research and
development activities for our programs. Since our inception, we have funded our
operations primarily through equity financings and from the proceeds received
from our collaboration agreement with Gilead Sciences, Inc., or Gilead. Since
inception, we have raised an aggregate of $166.9 million of gross proceeds from
the sale of our preferred shares, $342.1 million in gross proceeds through the
closing of the Business Combination and PIPE Financing transactions (as
described below) and another $212.1 million through our collaboration with
Gilead.

We believe that our existing cash, cash equivalents and marketable securities on
hand as of December 31, 2021 of $485.3 million will enable us to fund our
operating expenses and capital expenditure requirements at least into the second
half of 2024. Since inception, we have incurred significant operating losses.
For the years ended December 31, 2021 and 2020, our net losses were $58.2
million and $52.0 million, respectively. We had an accumulated deficit of $161.3
million as of December 31, 2021. We expect to continue to incur significant and
increasing expenses and operating losses for the foreseeable future, as we
advance our product candidates through preclinical and clinical development and
seek regulatory approvals, manufacture drug product and drug supply, maintain
and expand our intellectual property portfolio, as well as hire additional
personnel, pay for accounting, audit, legal, regulatory and consulting services,
and pay costs associated with maintaining compliance with Nasdaq listing rules
and the requirements of the U.S. Securities and Exchange Commission, or SEC,
director and officer liability insurance, investor and public relations
activities and other expenses associated with operating as a public company. Our
net losses may fluctuate significantly from quarter-to-quarter and year-to-year,
depending on the timing of our preclinical studies, our clinical trials and our
expenditures on other research and development activities.

We do not have any product candidates approved for sale and have not generated
any revenue from product sales. We will not generate revenue from product sales
unless and until we successfully complete clinical development and obtain
regulatory approval for our product candidates, if ever. In addition, if we
obtain regulatory approval for our product candidates and do not enter into a
third-party commercialization partnership, we expect to incur significant
expenses related to developing our commercialization capability to support
product sales, marketing, manufacturing and distribution activities. As a
result, we will need substantial additional funding to support our continuing
operations and pursue our growth strategy. Until we can generate significant
revenue from product sales, if ever, we expect to finance our operations through
a combination of public or private equity offerings and debt financings or other
sources, such as potential collaboration agreements, strategic alliances and
licensing arrangements. We may be unable to raise additional funds or enter into
such other agreements or arrangements when needed on acceptable terms, or at
all. Our failure to raise capital or enter into such agreements as, and when
needed, could have a negative effect on our business, results of operations and
financial condition.

Because of the numerous risks and uncertainties associated with pharmaceutical
development, we are unable to predict the timing or amount of increased expenses
or when or if we will be able to achieve or maintain profitability. Even if we
are able to generate revenues from the sale of our therapies, we may not become
profitable. If we fail to become profitable or are unable to sustain
profitability on a continuing basis, then we may be unable to continue our
operations at planned levels and be forced to reduce our operations.

Revenue



To date, we have not recognized any revenue from product sales, and we do not
expect to generate any revenue from the sale of products in the next several
years. If our development efforts for our product candidates are successful and
result in regulatory approval, or license agreements with third parties, we may
generate revenue in the future from product sales. However, there can be no
assurance as to when we will generate such revenue, if at all.
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Collaboration Agreements with Gilead Sciences



In October 2018, we entered into a collaboration agreement with Gilead, or the
2018 Gilead Agreement. Pursuant to the terms of the 2018 Gilead Agreement, we
received an initial upfront payment of $50.0 million. The upfront payment was
initially recorded as deferred revenue on our balance sheet and is recognized as
revenue as or when the performance obligation under the contract is satisfied.

In July 2019, Gilead licensed a program from us, and also separately contracted
for additional services related to the program through a letter agreement. By
December 2019, we had substantially completed our required obligations under the
license and side letter agreement, and as a result, recognized $9.4 million of
revenue. By December 2020, all remaining obligations under the license and side
letter agreement were completed, resulting in the recognition of the remaining
consideration of $0.7 million of revenue.

In August 2020, the 2018 Gilead Agreement was expanded into a broader
collaboration via an amended and restated research collaboration and license
agreement, or the Gilead Agreement. Pursuant to the terms of the Gilead
Agreement, we received an upfront payment of $125.0 million. Consistent with the
treatment of the previously received upfront payment, this upfront payment was
recorded as deferred revenue on our balance sheet and is recognized as revenue
as or when the performance obligation under the contract is satisfied.

In December 2020 and September 2021, Gilead elected to extend two programs for
research extension fees totaling $24.0 million, which was added to our estimate
of the transaction price to total $199.0 million. A total of $10.0 million of
fees related to the research extensions have not been received as of December
31, 2021 as these were determined to be conditional upon the satisfaction of
additional research obligations, and thus a contract asset, however, we
determined that achievement of the entire research extension fees was probable
and that a significant reversal in the amount of cumulative revenue recognized
would not occur.

In April 2021, Gilead licensed a program for an $11.0 million fee. The $11.0
million license fee was received and recognized as revenue in the second quarter
of 2021 since we have no continued involvement in the advancement of the
program, Gilead can benefit from the license on its own and the license is
separately identifiable from the research services.

As of December 31, 2021, $50.3 million has been recognized as collaboration revenue related to the upfront and research extension payments from the Gilead Agreement.



During the years ended December 31, 2021 and 2020, we recognized $26.0 million
and $7.0 million, respectively, of collaboration revenue associated with the
Gilead Agreements based on performance completed during each period.

Refer to Note 2 and Note 4 to our audited consolidated financial statements included elsewhere in this Annual Report on Form 10-K for additional information regarding our revenue recognition accounting policy and our collaboration agreement with Gilead.

Operating Expenses

Research and Development Expenses



Research and development expenses consist primarily of costs incurred for our
research activities, including our drug discovery efforts and the development of
our product candidates. We expense research and development costs as incurred,
which include:


employee-related expenses, including salaries, bonuses, benefits, stock-based
compensation, other related costs for those employees involved in research and
development efforts;

external research and development expenses incurred under agreements with contract research organizations, or CROs, as well as consultants that conduct our preclinical studies and development services;

costs related to manufacturing material for our preclinical and clinical studies;

laboratory supplies and research materials;

costs to fulfill our obligations under the collaboration with Gilead;

costs related to compliance with regulatory requirements; and


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facilities, depreciation and other allocated expenses, which include direct and allocated expenses for rent, utilities and insurance.




Costs for certain activities are recognized based on an evaluation of the
progress to completion of specific tasks using data such as information provided
to us by our vendors and analyzing the progress of our preclinical studies or
other services performed. Significant judgment and estimates are made in
determining the accrued expense balances at the end of any reporting period.

Our direct external research and development expenses consist primarily of fees
paid to CROs and outside consultants in connection with our preclinical and
clinical development and manufacturing activities. Our direct external research
and development expenses also include fees incurred under license agreements. We
track these external research and development costs on a program-by-program
basis once we have identified a product candidate.

We do not allocate employee costs, costs associated with our target discovery
efforts, laboratory supplies, and facilities, including depreciation or other
indirect costs, to specific programs because these costs are deployed across
multiple programs and, as such, are not separately classified. We characterize
research and development costs incurred prior to the identification of a product
candidate as discovery costs. We use internal resources primarily to conduct our
research and discovery activities as well as for managing our preclinical
development and manufacturing activities.

The following table summarizes our research and development expenses:



                                                   Year Ended December 31,
                                                     2021             2020
                                                        (in thousands)
TNG908 direct program expenses                   $     11,012       $   

9,548


USP1 direct program expenses                            8,009           

4,594


Discovery direct program expenses                      28,031          

13,365

Unallocated research and development expenses:


    Personnel related expenses                         21,276          

12,937


    Facilities and other related expenses               9,308           

9,547

Total research and development expenses $ 77,636 $ 49,991




The successful development of our product candidates is highly uncertain. We
plan to substantially increase our research and development expenses for the
foreseeable future as we continue the development of our product candidates and
manufacturing processes and conduct discovery and research activities for our
preclinical programs. We cannot determine with certainty the timing of
initiation, the duration or the completion costs of current or future
preclinical studies and clinical trials of our product candidates or the timing
of regulatory filings in connection with clinical trials or regulatory approval,
due to the inherently unpredictable nature of preclinical and clinical
development. Clinical and preclinical development timelines, the probability of
success and development costs can differ materially from expectations. We
anticipate that we will make determinations as to which product candidates to
pursue and how much funding to direct to each product candidate on an ongoing
basis in response to the results of ongoing and future preclinical studies and
clinical trials, regulatory developments and our ongoing assessments as to each
product candidate's commercial potential. Our clinical development costs are
expected to increase significantly as we commence clinical trials. We anticipate
that our expenses will increase substantially, particularly due to the numerous
risks and uncertainties associated with developing product candidates, including
the uncertainty of:

the scope, rate of progress, and expenses of our ongoing research activities as well as any preclinical studies, clinical trials and other research and development activities;

establishing an appropriate safety profile with IND enabling studies;

successful enrollment in and completion of clinical trials;

whether our product candidates show safety and efficacy in our clinical trials;

receipt of marketing approvals from applicable regulatory authorities;

the progress of our collaboration with Gilead;

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


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

commercializing product candidates, if and when approved, whether alone or in collaboration with others; and

continued acceptable safety profile of products following any regulatory approval.



Any changes in the outcome of any of these variables with respect to the
development of our product candidates in preclinical and clinical development
could mean a significant change in the costs and timing associated with the
development of these product candidates. We may never succeed in achieving
regulatory approval for any of our product candidates. We may obtain unexpected
results from our clinical trials. We may elect to discontinue, delay or modify
clinical trials of some product candidates or focus on other product candidates.
For example, if the U.S. Food and Drug Administration, or FDA, European
Medicines Agency, or EMA, or another regulatory authority were to delay our
planned start of clinical trials or require us to conduct clinical trials or
other testing beyond those that we currently expect or if we experience
significant delays in enrollment in any of our planned clinical trials, we could
be required to expend significant additional financial resources and time on the
completion of clinical development of that product candidate.

General and Administrative Expenses



General and administrative expense consists primarily of employee related costs,
including salaries, bonuses, benefits, stock-based compensation and other
related costs. General and administrative expense also includes professional
services, including legal, accounting and audit services and other consulting
fees as well as facility costs not otherwise included in research and
development expenses, insurance and other general administrative expenses.

We anticipate that our general and administrative expenses will increase in the
future as we increase our headcount to support our continued research activities
and development of our product candidates. We also anticipate that we will incur
significantly increased accounting, audit, legal, regulatory, compliance and
director and officer insurance costs as well as investor and public relations
expenses associated with operating as a public company.

Other Income (Expense), Net

Interest Income



Interest income consists of income earned and losses incurred in connection with
our investments in money market funds, U.S. Treasury bills and U.S. government
agency bonds.

Other (Expense) Income, Net

Other (expense) income, net consists of miscellaneous income and expense unrelated to our core operations.

Provision for Income Taxes



Our provision for income tax consists of an estimate for U.S. federal and state
income taxes based on enacted rates, as adjusted for allowable credits,
deductions, uncertain tax positions, changes in deferred tax assets and
liabilities and changes in tax law. We have recorded a provision for income
taxes in the amount of $0.3 million for the year ended December 31, 2021. There
was no provision for income taxes for the year ended December 31, 2020 because
we have historically incurred net operating losses and maintain a full valuation
allowance against our deferred tax assets.
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Results of Operations

Comparison of the Years Ended December 31, 2021 and 2020



The following table summarizes our results of operations for the years ended
December 31, 2021 and 2020:

                                    Year Ended December 31,
                                      2021             2020         Change
                                               (in thousands)
Collaboration revenue             $     26,042       $   6,972     $ 19,070
License revenue                         11,000             684       10,316
Total revenue                           37,042           7,656       29,386
Operating expenses:
Research and development                77,636          49,991       27,645
General and administrative              17,596           9,865        7,731
Total operating expenses                95,232          59,856       35,376
Loss from operations                   (58,190 )       (52,200 )     (5,990 )
Other income (expense), net:
Interest income                            495             108          387
Other (expense) income, net               (248 )           120         (368 )
Total other income, net                    247             228           19
Loss before income taxes               (57,943 )       (51,972 )     (5,971 )
Provision for income taxes                (292 )             -         (292 )
Net loss                               (58,235 )       (51,972 )     (6,263 )

Net loss and comprehensive loss $ (59,017 ) $ (51,965 ) $ (7,052 )






Collaboration Revenue

Collaboration revenue of $26.0 million and $7.0 million for the years ended
December 31, 2021 and 2020, respectively, was derived from the Gilead
collaboration. The increase of $19.1 million is primarily due to the charge
against revenue of $11.3 million in the third quarter of 2020 driven by a
cumulative catch-up adjustment to the revenue previously recognized from the
Gilead collaboration due to a change to the transaction price resulting from the
execution of the Gilead Agreement as well as incremental costs incurred during
the year ended December 31, 2021 resulting in greater collaboration revenue
recognition.

License Revenue



License revenue of $11.0 million and $0.7 million for the years ended December
31, 2021 and 2020, respectively, was derived from the Gilead collaboration. The
increase of $10.3 million is primarily due to Gilead licensing a program for
$11.0 million during the second quarter of 2021 as compared to residual 2019
Gilead Letter Agreement revenue of $0.7 million recognized during the year ended
December 31, 2020.

Research and Development Expenses



Research and development expense was $77.6 million for the year ended December
31, 2021 compared to $50.0 million for the year ended December 31, 2020. The
increase of $27.6 million was primarily due to a $18.6 million increase in
external CRO expenses and lab supplies primarily relating to the advancement of
our programs. Additionally, personnel-related costs increased $6.8 million
primarily due to an increase of share-based compensation expense and additional
headcount to support our research and development activities, as well as a $2.5
million increase in IT spend, consulting and professional fees.

General and Administrative Expenses



General and administrative expense was $17.6 million for the year ended December
31, 2021 compared to $9.9 million for the year ended December 31, 2020. The
increase of $7.7 million was primarily due to a $4.8 million increase in
personnel-related costs due to an increase in share-based compensation expense
and additional headcount, as well as a $1.4 million increase in consulting and
professional fees.
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Interest Income



Interest income was $0.5 million for the year ended December 31, 2021 compared
to $0.1 million for the year ended December 31, 2020. The increase of $0.4
million was primarily due to an increase in cash invested and interest rates in
2021 as compared to 2020.

Other (Expense) Income, Net

Other expense, net was $0.2 million for the year ended December 31, 2021
compared to other income of $0.1 million for the year ended December 31, 2020.
Other (expense) income was not significant for both the years ended December 31,
2021 and 2020.

Provision for Income Taxes

Provision for income taxes was $0.3 million for the year ended December 31, 2021
compared to $0 for the year ended December 31, 2020. The increase of $0.3
million is primarily attributable to taxable deferred revenue partially offset
by the utilization of federal and state net operating losses and federal and
state tax credits.

Liquidity and Capital Resources

Sources of Liquidity



Since our inception, we have generated recurring net losses. We have not yet
commercialized any product and we do not expect to generate revenue from sales
of any products for several years, if at all. Since our inception, we have
funded our operations primarily through proceeds from the issuance of equity in
the form of stock and from the proceeds received from our collaboration with
Gilead. To date, we have raised an aggregate of $166.9 million of gross proceeds
from the private placement of preferred shares, $342.1 million of gross proceeds
from the Business Combination and PIPE Financing transactions, and $212.1
million through the collaboration and license agreement with Gilead. As of
December 31, 2021, we had cash and cash equivalents and marketable securities of
$485.3 million.

Funding Requirements

We believe that our existing cash, cash equivalents and marketable securities on
hand as of December 31, 2021 of $485.3 million will enable us to fund our
operating expenses and capital expenditure requirements at least into the second
half of 2024. We have based this estimate on assumptions that may prove to be
wrong, and we could expend our capital resources sooner than we expect.

Cash Flows

Comparison of the Years Ended December 31, 2021 and 2020



The following table summarizes our cash flows for each of the years presented:

                                                  Year Ended December 31,
                                                    2021             2020          Change
                                                       (in thousands)
Net cash (used in) provided by operating
activities                                      $     (59,527 )   $   70,074     $ (129,601 )
Net cash used in investing activities                (183,434 )     (145,466 )      (37,968 )
Net cash provided by financing activities             357,325         80,884        276,441
Net increase in cash, cash equivalents and
restricted cash                                 $     114,364     $    5,492     $  108,872


Operating Activities

Net cash used in operating activities was $59.5 million for the year ended
December 31, 2021 compared to net cash provided by operating activities of $70.1
million for the year ended December 31, 2020. The net cash used in operations
for the year ended December 31, 2021 was primarily driven by the net loss of
$58.2 million as a direct result of higher operating expenses related to the
advancement of our programs and personnel-related costs. The net cash provided
by operations for the year
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ended December 31, 2020 was primarily driven by a $125.0 million non-refundable
upfront payment received from Gilead that was recorded as deferred revenue in
2020 and was partially offset by a net loss of $52.0 million.

Investing Activities



Net cash used in investing activities was $183.4 million for the year ended
December 31, 2021 compared to net cash used in investing activities of $145.5
million for the year ended December 31, 2020. The increase in cash used in
investing activities was primarily due to increased purchases of marketable
securities and was partially offset by an increase in sales and maturities of
marketable securities.

Financing Activities

Net cash provided by financing activities was $357.3 million for the year ended
December 31, 2021 compared to net cash provided by financing activities of $80.9
million for the year ended December 31, 2020. The increase in net cash provided
by financing activities for the year ended December 31, 2021 was primarily due
to net proceeds of $326.3 million received upon the closing of the Business
Combination and PIPE Financing in August 2021, as well as $30.0 million in
proceeds related to the issuance of shares of redeemable convertible Series B
preferred stock in March 2021. The net cash provided by financing activities for
the year ended December 31, 2020 was primarily due to net proceeds of $30.0
million related to the issuance of shares of redeemable convertible Series B
preferred stock in April 2020 and net proceeds of $51.2 million related to the
issuance of shares of redeemable convertible Series-B-1 preferred stock in
August 2020.

Contractual Obligations and Commitments



The following table summarizes our contractual obligations at December 31, 2021
and the effects that such obligations are expected to have on our liquidity and
cash flows in future periods:

                                                                 Payments Due by Period
                                                    Less than                                           More than
                                       Total         1 Year         1 - 3 Years       3 - 5 Years        5 Years
                                                                     (in thousands)
Operating lease commitments           $  1,572     $     1,572     $           -     $           -     $          -
Total                                 $  1,572     $     1,572     $           -     $           -     $          -


The commitment amounts in the table above reflect the minimum payments due under
our amended operating lease for office and laboratory space at our 100 Binney
Street, Cambridge, Massachusetts location. These commitments are also recognized
as operating lease liabilities in our balance sheet at December 31, 2021. In
November 2021, we entered into a lease termination agreement for our leased
office and laboratory space at 100 Binney Street in Cambridge, Massachusetts.
The lease termination agreement is a modification of the lease agreement for
these premises that provides, among other things, the acceleration of the
expiration of the original term of the lease from June 30, 2026 to an earlier
lease termination date, for which the earlier date shall be no later than
October 15, 2022. Refer to Note 8 to our audited consolidated financial
statements included elsewhere in this Annual Report on Form 10-K for additional
discussion of the impact resulting from the lease termination agreement.

The table does not include the minimum payments due under our new operating
lease for office and laboratory space at the 201 Brookline Avenue, Boston,
Massachusetts as we have not occupied the premises and the lease payments in
connection with this lease are yet to commence as of December 31, 2021.
Commitments pertaining to the 201 Brookline Avenue lease will be added to the
table above, and also recognized as operating lease liabilities on our balance
sheet upon achievement of the new lease commencement date. The fixed annual rent
payable under the lease is $5.1 million, increasing by 3% annually from the rent
commencement date.

Purchase Obligations

In the normal course of business, we enter into contracts with third parties for
preclinical studies, clinical operations and research and development supplies.
These contracts generally do not contain minimum purchase commitments and
provide for termination on notice, and therefore are cancellable contracts.
These payments are not included in the table above as the amount and timing of
such payments are not known as of December 31, 2021.
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License Agreement Obligations



We have also entered into license agreements under which we may be obligated to
make milestone and royalty payments. We have not included future milestone or
royalty payments under these agreements in the table above since the payment
obligations are contingent upon future events, such as achieving certain
development, regulatory, and commercial milestones or generating product sales.
As of December 31, 2021 and December 31, 2020, we were unable to estimate the
timing or likelihood of achieving these milestones or generating future product
sales. Refer to Note 9 to our audited consolidated financial statements included
elsewhere in this Annual Report on Form 10-K for a description of our license
agreements.

Critical Accounting Policies and Significant Judgments and Estimates



Our consolidated financial statements have been prepared in accordance with U.S.
GAAP. The preparation of these consolidated financial statements requires us to
make judgments and estimates that affect the reported amounts of assets,
liabilities, revenues 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 and at the time these estimates are made,
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. Some of
the judgments and estimates we make can be subjective and complex. Our actual
results may differ from these estimates under different assumptions or
conditions. On an ongoing basis, we evaluate our judgments and estimates in
light of changes in circumstances, facts, and experience. The effects of
material revisions in estimates, if any, will be reflected in the consolidated
financial statements prospectively from the date of change in estimates.

While our significant accounting policies are described in more detail in Note 2
to our audited consolidated financial statements and related notes appearing
elsewhere in this Annual Report on Form 10-K, we believe that the following
accounting policies are those most critical to the judgments and estimates used
in the preparation of our financial statements.

Revenue Recognition

The terms of our collaboration agreements may include consideration such as non-refundable up-front payments, license fees, research extension fees, and clinical, regulatory and sales-based milestones and royalties on product sales.



We recognize revenue under ASC Topic 606, Revenue from Contracts with Customers,
or ASC 606, which applies to all contracts with customers, except for contracts
that are within the scope of other standards, such as leases, insurance,
collaboration arrangements and financial instruments. ASC 606 provides a
five-step framework whereby revenue is recognized when control of promised goods
or services is transferred to a customer at an amount that reflects the
consideration to which the entity expects to be entitled in exchange for those
goods or services. To determine revenue recognition for arrangements that we
determine are within the scope of the revenue standard, we perform the following
five steps: (i) identify the promised goods or services in the contract; (ii)
determine whether the promised goods or services are performance obligations
including whether they are distinct in the context of the contract; (iii)
measure the transaction price, including the constraint on variable
consideration; (iv) allocate the transaction price to the performance
obligations; and (v) recognize revenue when (or as) we satisfy each performance
obligation. We only apply the five-step model to contracts when collectability
of the consideration to which we are entitled in exchange for the goods or
services we transfer to the customer is determined to be probable. At contract
inception, once the contract is determined to be within the scope of ASC 606, we
assess whether the goods or services promised within each contract are distinct
and, therefore, represent a separate performance obligation. Goods and services
that are determined not to be distinct are combined with other promised goods
and services until a distinct bundle is identified. We then allocate the
transaction price (the amount of consideration we expect to be entitled to from
a customer in exchange for the promised goods or services) to each performance
obligation and recognize the associated revenue when (or as) each performance
obligation is satisfied. Our estimate of the transaction price for each contract
includes all variable consideration to which we expect to be entitled.

We recognize the transaction price allocated to license payments as revenue upon
delivery of the license to the customer and resulting ability of the customer to
use and benefit from the license, if the license is determined to be distinct
from the other performance obligations identified in the contract. If the
license is considered to not be distinct from other performance obligations, we
utilize judgment to assess the nature of the combined performance obligation to
determine whether the combined performance obligation is satisfied (i) at a
point in time, but only for licenses determined to be distinct from other
performance obligations in the contract, or (ii) over time; and, if over time,
the appropriate method of measuring progress for purposes of recognizing revenue
from license payments. We evaluate the measure of progress each reporting period
and, if necessary, adjust the measure of performance and related revenue
recognition.
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We evaluate whether it is probable that the consideration associated with each
milestone payment will not be subject to a significant reversal in the
cumulative amount of revenue recognized. Amounts that meet this threshold are
included in the transaction price using the most likely amount method, whereas
amounts that do not meet this threshold are considered constrained and excluded
from the transaction price until they meet this threshold. Milestones tied to
regulatory approval, and therefore not within our control, are considered
constrained until such approval is received. Upfront and ongoing development
milestones under our collaboration agreements are not subject to refund if the
development activities are not successful. At the end of each subsequent
reporting period, we re-evaluate the probability of a significant reversal of
the cumulative revenue recognized for the milestones, and, if necessary, adjust
the estimate of the overall transaction price. Any such adjustments are recorded
on a cumulative catch-up basis, which would affect revenues from collaborators
in the period of adjustment. We exclude sales-based milestone payments and
royalties from the transaction price until the sale occurs (or, if later, until
the underlying performance obligation to which some or all of the royalty has
been allocated has been satisfied or partially satisfied), because the license
to our intellectual property is deemed to be the predominant item to which the
royalties relate as it is the primary driver of value.

ASC 606 requires us to allocate the arrangement consideration on a relative
standalone selling price basis for each performance obligation after determining
the transaction price of the contract and identifying the performance
obligations to which that amount should be allocated. The relative standalone
selling price is defined in ASC 606 as the price at which an entity would sell a
promised good or service separately to a customer. If other observable
transactions in which we have sold the same performance obligation separately
are not available, we are required to estimate the standalone selling price of
each performance obligation. Key assumptions to determine the standalone selling
price may include forecasted revenues, development timelines, reimbursement
rates for personnel costs, discount rates and probabilities of technical and
regulatory success.

Whenever we determine that multiple promises to a customer are not distinct and
comprise a combined performance obligation that includes services, we recognize
revenue over time using the cost-to-cost input method, based on the total
estimated cost to fulfill the obligation. Significant management judgment is
required in determining the level of effort required under an arrangement and
the period over which we are expected to complete our performance obligations
under an arrangement.

Consideration that does not meet the requirements to satisfy the above revenue
recognition criteria is a contract liability and is recorded as deferred revenue
in the consolidated balance sheets. We have recorded short-term and long-term
deferred revenue on our consolidated balance sheets based on our best estimate
of when such revenue will be recognized. Short-term deferred revenue consists of
amounts that are expected to be recognized as revenue in the next 12 months.
Amounts that we expect will not be recognized within the next 12 months are
classified as long-term deferred revenue.

In certain instances, the timing of and total costs of satisfying these
obligations under our collaboration agreement can be difficult to estimate.
Accordingly, our estimates may change in the future. Such changes to estimates
would result in a change in revenue recognition amounts. If these estimates and
judgments change over the course of these agreements, it may affect the timing
and amount of revenue that we will recognize and record in future periods.

Under ASC 606, we will recognize revenue when we fulfill our performance
obligations under the agreement with Gilead. As the required performance
obligation is satisfied, we will recognize revenue for the portion satisfied and
record a receivable for any fees that have not been received. Amounts are
recorded as short-term collaboration receivables when our right to consideration
is unconditional. A contract liability is recognized when a customer prepays
consideration or owes payment to an entity in advance of our performance
according to a contract. We do not assess whether a contract has a significant
financing component if the expectation at contract inception is that the period
between payment by the customer and the transfer of the promised goods or
services to the customer will be one year or less. We expense incremental costs
of obtaining a contract as and when incurred if the expected amortization period
of the asset that we would have recognized is one year or less or the amount is
immaterial.

Accrued Research and Development Expenses



As part of the process of preparing our consolidated financial statements, we
are required to estimate our accrued research and development expenses. This
process involves estimating the level of service performed and the associated
cost incurred for the service when we have not yet been invoiced or otherwise
notified of 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 advance payments, which would be
recorded as a prepaid expense in other assets, or if there is the right of
offset, offset against our liability balance with the counterparty. We make
estimates of our accrued expenses as of each balance sheet date in the
consolidated financial statements based on facts and circumstances known to us
at that time. At
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each period end, we corroborate the accuracy of these estimates with the service providers and make adjustments, if necessary.



We record the expense and accrual related to research and development activities
performed by our vendors based on our estimates of the services received and
efforts expended considering a number of factors, including our knowledge of the
progress towards completion of the research and development activities;
invoicing to date under the contracts; communication from the vendors of any
actual costs incurred during the period that have not yet been invoiced; and the
costs included in the contracts and purchase orders. The financial terms of
these agreements are subject to negotiation, vary from contract to contract and
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. In accruing service 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 the estimate, we adjust the accrual or 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 reporting amounts that are too high or too
low in any particular period. To date, there have not been any material
adjustments to our prior estimates of accrued research and development expenses.

Stock-Based Compensation



We estimate the fair value of our stock option awards using the Black-Scholes
method utilizing the "simplified method," for determining the expected life of
the award, which is based on the mid-point between the vesting date and the end
of the contractual term as all options granted after becoming a public entity
will be granted "at-the-money." We determine the volatility for options granted
based on an analysis of reported data for a peer group of companies. The
expected volatility of granted options has been determined using a
weighted-average of the historical volatility measures of this peer group of
companies. We will continue to apply this method until a sufficient amount of
historical information regarding the volatility of our own stock price becomes
available. The fair value of each share of common stock underlying stock-based
awards is based on the closing price of our common stock as reported by Nasdaq
on the date of grant. The risk-free interest rate utilized in our calculations
is based on a treasury instrument whose term is consistent with the expected
life of the stock options. The expected dividend yield is assumed to be zero as
we have never paid dividends and do not have current plans to pay any dividends
on our common stock.

We measured stock-based awards granted to employees, non-employees and directors
based on their fair value on the date of the grant using the Black-Scholes
option-pricing model for options or the difference between the purchase price
per share of the award, if any, and the fair value of our common stock for
restricted common stock awards.

Prior to the consummation of the Business Combination, as there was not a public
market for our common stock prior to becoming publicly traded in August 2021,
the estimated fair value of our common stock was determined by our board of
directors as of the date of grant of each option or restricted stock award,
considering our most recently available third-party valuations of common stock
and our board of directors' assessment of additional objective and subjective
factors that it believed were relevant and which may have changed from the date
of the most recent valuation through the date of the grant. These third-party
valuations were performed in accordance with the guidance outlined in the
American Institute of Certified Public Accountants' Accounting and Valuation
Guide, Valuation of Privately-Held-Company Equity Securities Issued as
Compensation. Our common stock valuations were prepared using either an option
pricing method, or OPM, or a hybrid method, both of which used market approaches
to estimate our enterprise value. The OPM treats common stock and preferred
stock as call options on the total equity value of a company, with exercise
prices based on the value thresholds at which the allocation among the various
holders of a company's securities changes. Under this method, the common stock
had value only if the funds available for distribution to stockholders exceed
the value of the preferred stock liquidation preferences at the time of the
liquidity event, such as a strategic sale or a merger. The hybrid method was a
probability-weighted expected return method, or PWERM, where the equity value in
one or more scenarios is calculated using an OPM. The PWERM is a scenario-based
methodology that estimated the fair value of common stock based upon an analysis
of future values for the company, assuming various outcomes. The common stock
value was based on the probability-weighted present value of expected future
investment returns considering each of the possible outcomes available as well
as the rights of each class of stock. The future value of the common stock under
each outcome was discounted back to the valuation date at an appropriate
risk-adjusted discount rate and probability weighted to arrive at an indication
of value for the common stock. A discount for lack of marketability of the
common stock is then applied to arrive at an indication of value for the common
stock. The Black-Scholes option-pricing model also uses as inputs the fair value
of our common stock and assumptions we make for the
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volatility of our common stock, the expected term of our common stock options,
the risk-free interest rate for a period that approximates the expected term of
our common stock options, and our expected dividend yield.

Compensation expense for awards is recognized over the requisite service period,
which is generally the vesting period of the respective award for employees and
directors and the period during which services are performed for non-employees.
We use the straight-line method to record the expense of awards with
service-based vesting conditions.

We believe our methodologies are reasonable based upon our internal peer company
analyses. If different assumptions had been made, equity-based compensation
expense, consolidated net loss and consolidated net loss per share could have
been significantly different.

Recently Adopted Accounting Pronouncements



A description of recently issued accounting pronouncements that may potentially
impact our financial position, results of operations or cash flows is disclosed
in Note 2 to our audited consolidated financial statements and related notes
appearing elsewhere in this this Annual Report on Form 10-K.

Emerging Growth Company and Smaller Reporting Company Status



We are an "emerging growth company," under the JOBS Act. Section 107 of the JOBS
Act provides that an emerging growth company can take advantage of the extended
transition period provided in Section 7(a)(2)(B) of the Securities Act for
complying with new or revised accounting standards. Thus, an emerging growth
company can delay the adoption of certain accounting standards until those
standards would otherwise apply to private companies. We have elected to avail
ourselves of delayed adoption of new or revised accounting standards and,
therefore, we will be subject to the same requirements to adopt new or revised
accounting standards as private entities. As an emerging growth company, we may
take advantage of certain exemptions and reduced reporting requirements under
the JOBS Act. Subject to certain conditions, as an emerging growth company:

we may present only two years of audited financial statements and only two years of related Management's Discussion and Analysis of Financial Condition and Results of Operations in our periodic reports and registration statements, including this Annual Report on Form 10-K;


we may avail ourselves of the exemption from 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;

we may provide reduced disclosure about our executive compensation arrangements; and

we may not require nonbinding advisory votes on executive compensation or stockholder approval of any golden parachute payments.



We will remain an emerging growth company until the earliest of (i) December 31,
2025, (ii) the last day of the fiscal year in which we have total annual gross
revenues of $1.07 billion or more, (iii) the last day of the fiscal year in
which we are deemed to be a "large accelerated filer" as defined in Rule 12b-2
under the Exchange Act, which would occur if the market value of our common
stock held by non-affiliates exceeded $700.0 million as of the last business day
of the second fiscal quarter of such year, provided we have been subject to the
Exchange Act for at least 12 calendar months and have filed at least one annual
report pursuant to the Exchange Act or (iv) the date on which we have issued
more than $1.0 billion in non-convertible debt securities during the prior
three-year period. We may choose to take advantage of some but not all of these
exemptions.

We are also a "smaller reporting company," meaning that the market value of our
stock held by non-affiliates is less than $700 million and our annual revenue
was less than $100 million during the most recently completed fiscal year. We
may continue to be a smaller reporting company if either (i) the market value of
our stock held by non-affiliates is less than $250 million or (ii) our annual
revenue was less than $100 million during the most recently completed fiscal
year and the market value of our stock held by non-affiliates is less than $700
million. If we are a smaller reporting company at the time we cease to be an
emerging growth company, we may continue to rely on exemptions from certain
disclosure requirements that are available to smaller reporting companies.
Specifically, as a smaller reporting company we may choose to present only the
two most recent fiscal years of audited financial statements in our Annual
Report on Form 10-K and, similar to emerging growth companies, smaller reporting
companies have reduced disclosure obligations regarding executive compensation.
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