The following discussion and analysis is meant to provide material information relevant to an assessment of the financial condition and results of operations of our company, including an evaluation of the amounts and uncertainties of cash flows from operations and from outside resources, so as to allow investors to better view our company from management's perspective. The following discussion and analysis of our financial condition and results of operations should be read together with our condensed consolidated financial statements and related notes appearing elsewhere in this Quarterly Report on Form 10-Q, or Quarterly Report, and our Annual Report on Form 10-K for the year ended December 31, 2021, or the Annual Report on Form 10-K, that was filed with the United States Securities and Exchange Commission, or SEC, on March 24, 2022. In addition to historical information, the discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of certain factors. We discuss factors we believe could cause or contribute to these differences below and elsewhere in this Quarterly Report, including those factors set forth in the section entitled "Cautionary Note Regarding Forward-Looking Statements and Industry Data" and in the section entitled "Risk Factors" in Part II, Item 1A of this Quarterly Report. You should carefully read the section entitled "Risk Factors" in Part II, Item 1A of this Quarterly Report.

Overview

We are an innovative biopharmaceutical company pioneering the development of therapeutics engineered to stimulate the body's immune system for the treatment of cancer. We are leveraging our proprietary PREDATOR platform to design conditionally activated molecules that stimulate both adaptive and innate immunity with the goal of addressing the limitations of conventional proinflammatory immune therapies. Our molecules, which we refer to as INDUKINE molecules, are intended to activate selectively in the tumor microenvironment. Our most advanced product candidates, WTX-124 and WTX-330, are systemically delivered, conditionally activated Interleukin-2 and Interleukin-12, respectively, INDUKINE molecules for the treatment of multiple tumor types. We remain on track as we advance towards clinical development for WTX-124 and WTX-330.

In April 2022, we entered into a Collaboration and License Agreement, or the Collaboration Agreement, with Jazz Pharmaceuticals Ireland Limited, or Jazz, pursuant to which we granted Jazz certain licenses to develop and commercialize products containing our Interferon alpha (IFN?) INDUKINE molecule, WTX-613, as well as products containing certain isolated recombinant polypeptides comprising IFN? that meet specified criteria (each such product, a "Licensed Product"). Under the Collaboration Agreement, we will initially be responsible for certain pre-clinical development activities with respect to WTX-613 and other development activities specified in mutually agreed upon development plans. Jazz will generally reimburse us for the cost of such activities. Jazz will be responsible for all other development and commercialization activities conducted to exploit the Licensed Products, including submission of an IND to the FDA. Under the terms of the Collaboration Agreement, we received an upfront payment of $15.0 million in April 2022. We are also eligible to receive up to $520.0 million in development and regulatory milestones, and up to $740.0 million in sales-based milestones for all Licensed Products. In addition, we are eligible to receive tiered mid-single digit royalties based on Jazz's, and any of its affiliates' and sublicensees', annual net sales of Licensed Products, subject to reduction in specified circumstances.

We were incorporated and commenced operations in 2017. Since inception, we have devoted substantially all of our time and efforts to performing research and development activities, raising capital and recruiting management and technical staff to support these operations. To date, we have financed our operations primarily with proceeds from the sales of our convertible promissory notes and equity securities. From December 2017 to August 2018, we issued convertible promissory notes for aggregate gross cash proceeds of $11.0 million. From August 2019 to June 2020, we issued an aggregate of 80,246,565 shares of Series A preferred stock for aggregate gross cash proceeds of $44.2 million, together with conversion of all of our previously issued convertible promissory notes. In December 2020, we issued 78,222,173 shares of Series B preferred stock at a price of $0.92 per share, resulting in gross cash proceeds of $72.1 million. On May 4, 2021, we completed our initial public offering, or IPO, pursuant to which we issued and sold 7,500,000 shares of our common stock at a public offering price of $16.00 per share. We received net proceeds of approximately $109.2 million, after deducting underwriting discounts and commissions and other offering expenses payable by us.

Due to our significant research and development expenditures, we have accumulated substantial net losses since our inception. As of March 31, 2022, we had an accumulated deficit of $268.2 million. We expect to continue to incur substantial and increasing expenses and net losses for the foreseeable future, as we continue to advance our current and future product candidates through preclinical and clinical development, manufacture drug product and drug supply, seek regulatory approval for our current and future product candidates, maintain and expand our intellectual property portfolio, hire additional research and development and business personnel and operate as a public company.

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 material adverse effect on our business, results of operations and financial condition.

Because of the numerous risks and uncertainties associated with product development, we are unable to accurately predict the timing or amount of increased expenses or when, or if, we will be able to achieve profitability. Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. If we fail to become profitable or are unable to sustain profitability on a continuing basis, then we may be unable to raise capital, maintain our research and development efforts, expand our business or continue our operations at planned levels, and as a result we may be forced to substantially reduce or terminate our operations.



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Impact of COVID-19 on Our Business

The worldwide COVID-19 pandemic continues to evolve, and we will continue to monitor the COVID-19 pandemic closely. To date, we have not experienced a material financial statement impact or material business disruptions, including with our vendors, or impairments of any of our assets as a result of the pandemic. However, we cannot, at this time, predict the specific extent, duration or full impact that the COVID-19 pandemic will have on our financial statements and operations, including our ongoing and planned preclinical activities and future clinical trials. The extent of the impact of the COVID-19 pandemic, including the emergence of new variants or subvariants of the virus, on our business, operations and clinical development timelines and plans remains uncertain and will depend on certain developments, including the duration and spread of the pandemic and its impact on our contract research organizations, or CROs, third-party manufacturers, and other third parties with which we do business, as well as its impact on regulatory authorities and our key scientific and management personnel. To the extent possible, we are conducting business as usual. We will continue to actively monitor the rapidly evolving situation related to COVID-19 and may take further actions that alter our operations, including those that may be required by federal, state or local authorities, or that we determine are in the best interests of our employees and other third parties with which we do business.

Furthermore, the COVID-19 pandemic could affect our employees or the employees of research sites and service providers on which we rely, including CROs, as well as those of companies with which we do business, including our suppliers and contract manufacturing organizations, thereby disrupting our business operations. Quarantines and travel restrictions imposed by governments in the jurisdictions in which we and the companies with which we do business operate could materially impact the ability of employees to access preclinical and clinical sites, laboratories, manufacturing site and office. These and other events resulting from the COVID-19 pandemic could disrupt, delay, or otherwise adversely impact our business. Further information relating to the risks and uncertainties related to the ongoing COVID-19 pandemic is contained in the section titled "Risk Factors" in Part II, Item 1A of this Quarterly Report.

Financial Operations Overview

Revenue

Through March 31, 2022, we have not generated any revenue from any sources, including from product sales, and we do not expect to generate any revenue from the sale of products in the foreseeable future. As a result of our entry into the Collaboration Agreement, we expect to recognize collaboration revenue as a result of the receipt of the upfront payment, and any milestone payments that we receive under the Collaboration Agreement.

For the foreseeable future, we expect substantially all of our revenue will be generated from our Collaboration Agreement and any other collaborations or agreements that we may enter into.

Operating Expenses

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for our research activities, including our discovery efforts and the development of our product candidates, and include:

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

•expenses incurred under agreements with third parties that conduct research and preclinical activities on our behalf;

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

•costs of laboratory supplies and acquiring, developing and manufacturing preclinical study and future clinical trial materials; and

•facility-related expenses, which include direct depreciation costs and allocated expenses for rent and maintenance of facilities and other operating costs.

We expense research and development costs as incurred. Costs for external development activities are recognized based on an evaluation of the progress to completion of specific tasks using information provided to us by our vendors. Payments for these activities are based on the terms of the individual agreements, which may differ from the pattern of performance of the individual arrangements, which may differ from the pattern of billings incurred, and are reflected in our condensed consolidated financial statements as prepaid or accrued research and development expenses.

We typically use our employee and infrastructure resources across our development programs. We track external development costs by product candidate or development program, but we do not allocate personnel costs, license payments made under our licensing arrangements or other internal costs to specific development programs or product candidates.



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Our external development costs for the three months ended March 31, 2022 and
2021 were as follows:

                                         Three Months Ended
                                              March 31,
                                          2022            2021
WTX-124                             $    2,231          $   604
WTX-330                                  2,133            1,400
WTX-613                                  1,002              508
Pre-development candidates                 477              152

Total external development costs $ 5,843 $ 2,664

Research and development activities are central to our business model. We expect that our research and development expenses will continue to increase substantially for the foreseeable future as we initiate clinical trials of WTX-124 and WTX-330 and continue to discover and develop additional product candidates. As a result of our entry into the Collaboration Agreement, commencing in April 2022, our external preclinical development costs for WTX-613 will generally be reimbursed by Jazz.

The process of conducting the necessary clinical research to obtain regulatory approval is costly and time-consuming. We cannot reasonably estimate or know the nature, timing and estimated costs of the efforts that will be necessary to complete development of our current or future product candidates. The actual probability of success for our product candidates will depend on a variety of factors, including:

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

•establishing an appropriate safety profile;

•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;

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

•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 the products following any regulatory approval.

A change in the outcome of any of these variables with respect to the development of our current and future product candidates would significantly change the costs and timing associated with the development of those product candidates and we may never succeed in achieving regulatory approval for any of our product candidates. As a result of the uncertainties discussed above, we are unable to determine the duration and completion costs of our research and development activities.

General and Administrative Expenses

General and administrative expenses consist primarily of salaries, benefits and other related costs, including stock-based compensation, for personnel in our executive, finance, business development and administrative functions. General and administrative expenses also include legal fees relating to intellectual property and corporate matters; professional fees for accounting, auditing, tax and consulting services; insurance costs; travel expenses; and facility-related expenses, which include direct depreciation costs and allocated expenses for rent and maintenance of facilities and other operating costs.

We expect that our general and administrative expenses will increase in the future as we increase our personnel headcount to support our continued research and development activities, manufacturing activities and expansion of our operations in connection with our anticipated commencement of clinical trials. We also anticipate increased expenses associated with operating as a public company, including costs for audit, legal, regulatory and tax-related services related to compliance with the rules and regulations of the SEC and listing standards applicable to companies listed on a national securities exchange, director and officer insurance premiums and investor relations costs.



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Results of Operations

Comparison of the Three Months Ended March 31, 2022 and 2021

The following table summarizes our results of operations for the three months ended March 31, 2022 and 2021:



                                 Three Months Ended
                                     March 31,
(in thousands)                   2022           2021        $ Change
Operating expenses:
Research and development     $   10,945      $  4,817      $  6,128
General and administrative        4,421         2,635         1,786
Total operating expenses         15,366         7,452         7,914
Operating loss                  (15,366)       (7,452)       (7,914)
Other income:

Interest income, net                 23            17             6
Total other income                   23            17             6
Net loss                     $  (15,343)     $ (7,435)     $ (7,908)

Research and Development Expenses

The following table summarizes our research and development expenses for the three months ended March 31, 2022 and 2021:



                                              Three Months Ended
                                                  March 31,
(in thousands)                                2022           2021        $ Change
Manufacturing                             $     3,858      $ 1,988      $  1,870
Personnel                                       3,304        1,446         1,858
Contract research organization                  1,985          676         1,309
Facilities                                        806          137           669
Lab consumables                                   891          558           333
Other                                             101           12            89

Total research and development expenses $ 10,945 $ 4,817 $ 6,128

Research and development expenses for the three months ended March 31, 2022 were $10.9 million, compared to $4.8 million for the three months ended March 31, 2021. The increase of approximately $6.1 million was primarily due to:

•$1.9 million of increased manufacturing expense related to costs incurred with contract manufacturing organizations to support the production of preclinical and future clinical trial materials associated with our product candidates WTX-124, WTX-330 and WTX-613;

•$1.9 million of increased personnel costs, including $0.7 million of increased stock-based compensation expense, primarily due to increased headcount associated with expanded discovery efforts as well as the hiring of a clinical development team;

•$1.3 million of increased contract research organization expense, primarily driven by preclinical studies to support IND enabling studies for WTX-124 and WTX-330; and

•$0.7 million of increased facilities expense, primarily driven by our operating lease for our future headquarters entered in May 2021 and our short-term lease that commenced in April 2021.



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General and Administrative Expenses

The following table summarizes our general and administrative expenses for the three months ended March 31, 2022 and 2021:



                                                 Three Months Ended
                                                      March 31,
(in thousands)                                    2022            2021        $ Change
Personnel                                   $    2,257          $ 1,065      $  1,192
Professional services                              817            1,140          (323)
Facilities                                         315              289            26
Other                                            1,032              141           891

Total general and administrative expenses $ 4,421 $ 2,635 $ 1,786

General and administrative expenses were $4.4 million for the three months ended March 31, 2022, compared to $2.6 million for the three months ended March 31, 2021. The increase of approximately $1.8 million was primarily due to:

•$1.2 million of increased personnel costs due to the requirements of operating as a public company, which included $0.5 million of increased stock-based compensation expense;

•$0.3 million of decreased professional service costs, primarily due to hiring to support the requirements of operating as a public company; and

•$0.9 million of increased other costs, primarily driven by $0.7 million of increased insurance costs associated with public company management liability insurance.

Liquidity and Capital Resources

Sources of Liquidity

We have funded our operations through March 31, 2022 primarily through the issuance of convertible promissory notes for aggregate cash proceeds of $11.0 million, the issuance and sale of shares of our Series A and Series B preferred stock for aggregate cash proceeds of $116.3 million and the issuance and sale of shares of our common stock in our IPO in May 2021 for net proceeds of approximately $109.2 million, after deducting underwriting discounts and commissions and other offering expenses payable by us.

Jazz Collaboration

In April 2022, we entered into the Collaboration Agreement with Jazz. Under the terms of the Collaboration Agreement, we received an upfront payment of $15.0 million in April 2022. We are eligible to receive up to $520.0 million in development and regulatory milestones, and up to $740.0 million in sales-based milestones for all Licensed Products. In addition, we are eligible to receive tiered mid-single digit royalties based on Jazz's, and any of its affiliates' and sublicensees', annual net sales of Licensed Products, subject to reduction in specified circumstances.

Term Loan Facility

In April 2022, we entered into an amended and restated loan and security agreement, or the Loan Agreement, with Pacific Western Bank, or PWB, which amended and restated in its entirety our previous loan and security agreement with PWB. Under the terms of the Loan Agreement, PWB made available term loans in an aggregate principal amount of up to $40.0 million, of the Term Loans, consisting of (i) a term loan in the aggregate principal amount of up to $20.0 million available at any time until February 28, 2024, or as extended to August 31, 2024 upon the satisfaction of certain conditions set forth in the Loan Agreement (such date, the "Amortization Date"), and (ii) a term loan in the aggregate principal amount of up to $20.0 million available at any time until the Amortization Date upon the acceptance by the FDA of two IND submissions on or before March 31, 2023. As of May 10, 2022, the Term Loans remain undrawn.

The Term Loans bear interest on the outstanding daily balance at a floating annual rate equal to greater of: (i) 0.5% above the prime rate then in effect or (ii) 4.50%. If the prime rate changes throughout the term, the interest rate is adjusted effective on the date of the prime rate change. All interest chargeable under the Loan Agreement is computed on a 360-day year for the actual number of days elapsed, with interest payable monthly. The Loan Agreement provides for interest-only payments until the Amortization Date, at which time the aggregate outstanding principal balance of the Term Loans is required to be repaid in monthly installments on a 24-month repayment schedule. All unpaid principal and accrued and unpaid interest with respect to the Term Loans is due and payable in full on February 28, 2026, as extended to August 31, 2026 upon the satisfaction of certain conditions set forth in the Loan Agreement. At our option, we may elect to prepay all, or any part, of the outstanding Term Loans at any time without premium or penalty.

We are obligated to pay PWB a fee in the event of certain corporate transactions equal to either (i) the greater of (a) $200,000 and (b) 2.00% of the amount drawn under the Term Loans for a transaction occurring on or prior to March 31, 2023, or (ii) for any transaction occurring thereafter, the greater of (a) $400,000 and (b) 4.00% of the amount drawn under the Term Loans, which fee is referred to as a Success Fee. The Success Fee survives ten years from the date of payment of the Term Loans in full, such that, if the Loan Agreement is terminated prior to the payment of the Success Fee, we will remain obligated to pay the Success Fee upon the occurrence of a Success Fee Event during such ten-year period.

Under the Loan Agreement, we are required to comply with certain negative covenants, which among other things, restrict us from incurring future debt or granting liens, effectuating a merger or consolidation with or into any other business organization, paying dividends or making



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certain other distributions, selling or otherwise transferring our assets, and making investments in any entities or instruments, subject, in each case, to certain exceptions specified in the Loan Agreement. The Loan Agreement also contains standard affirmative covenants, including with respect to the issuance of audited consolidated financial statements, insurance, and maintenance of good standing and government compliance in our state of formation. On or before September 30, 2023, we are required to raise aggregate gross cash process of at least $50.0 million from the sale or issuance of our equity or from strategic partnerships or any similar transaction. From after receipt of those proceeds, we are required to maintain at all times at least $20.0 million of unrestricted cash in accounts with PWB. Our failure to comply with any of the foregoing covenants would result in an event of default under the Loan Agreement.

Plan of Operation and Future Funding Requirements

We use our capital resources primarily to fund operating expenses, primarily research and development expenditures. We plan to increase our research and development expenses for the foreseeable future as we continue the preclinical development and move into clinical development of our product candidates. At this time, due to the inherently unpredictable nature of preclinical and clinical development and given the early stage of our product candidates, we cannot reasonably estimate the costs we will incur and the timelines that will be required to complete development, obtain marketing approval and commercialize our current product candidates or any future product candidates, if at all. For the same reasons, we are also unable to predict when, if ever, we will generate revenue from product sales or whether, or when, if ever, we may achieve profitability. Clinical and preclinical development timelines, the probability of success, and development costs can differ materially from expectations. In addition, we cannot forecast which product candidates may be subject to future collaborations, when such arrangements will be secured, if at all, and to what degree such arrangements would affect our development plans and capital requirements. Further, inflation generally affects us by increasing our cost of labor and certain services. We do not believe that inflation had a material effect on our financial statements included elsewhere in this Quarterly Report; however, our operations may be adversely affected by inflation in the future.

Due to our significant research and development expenditures, we have accumulated substantial net losses in each period since inception. We have incurred an accumulated deficit of $268.2 million through March 31, 2022. We expect to continue to incur substantial and increasing expenses and net losses for the foreseeable future, as we continue to advance our current and future product candidates through preclinical and clinical development, manufacture drug product and drug supply, seek regulatory approval for our current and future product candidates, maintain and expand our intellectual property portfolio, hire additional research and development and business personnel and operate as a public company.

Based on our current research and development plans, we expect that our existing cash and cash equivalents of $143.7 million, along with the $15.0 million upfront payment received under our Collaboration Agreement and the first $20.0 million tranche under our Loan Agreement, will be sufficient to fund our operations through at least the fourth quarter of 2023. We have based this estimate on assumptions that may prove to be wrong, however, and we could use our capital resources sooner than we expect.

The timing and amount of our operating expenditures will depend largely on:

•the scope, progress, timing, costs and results of researching and developing our current product candidates or any future product candidates, including with respect to our planned clinical trials of WTX-124 and WTX-330; the costs associated with attracting, hiring and retaining skilled personnel and consultants as our preclinical and clinical activities increase;

•the cost of manufacturing our product candidates WTX-124, WTX-330, and any future product candidates for clinical trials and, if we are able to obtain marketing approval, for commercial sale;

•the costs of any third-party products used in our planned combination clinical trials that are not covered by such third parties or other sources;

•the potential additional expenses attributable to adjusting our development plans (including any supply related matters) as a result of the COVID-19 pandemic;

•the success of our collaboration with Jazz;

•the timing of, and the cost involved in, obtaining marketing approval for WTX-124 and WTX-330, or any future product candidates, and our ability to obtain marketing approval and generate revenue from any potential commercial sales of such product candidates;

•the cost of building a sales force in anticipation of product commercialization and the cost of commercialization activities for WTX-124, WTX-330, or any future product candidates if we receive marketing approval, including marketing, sales and distribution costs;

•the potential emergence of competing therapies and other adverse market developments;

•the amount and timing of any payments we may be required to make pursuant to our license agreement with Harpoon Therapeutics, Inc., or Harpoon, or other future license agreements or collaboration agreements;

•our ability to establish future collaborations, licensing or other arrangements and the financial terms of any such agreements, including the timing and amount of any future milestone, royalty or other payments due under any such agreement;

•the costs involved in preparing, filing, prosecuting, maintaining, expanding, defending and enforcing patent claims, including litigation costs and the outcome of such litigation;

•any product liability or other lawsuits related to our product candidates;



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•the extent to which we in-license or acquire other products and technologies; and

•the costs of operating as a public company.

Our existing cash and cash equivalents will not be sufficient to complete development of WTX-124, WTX-330 or any other product candidate. Accordingly, we will be required to obtain further funding to achieve our business objectives.

Until such time, if ever, as we can generate substantial revenue from product sales, we expect to fund our operations and capital funding needs through equity and/or debt financing. We may also consider entering into collaboration arrangements or selectively partnering for clinical development and commercialization. The sale of additional equity may result in additional dilution to our stockholders. The incurrence of debt financing would result in debt service obligations and the instruments governing such debt could provide for operating and financing covenants that would restrict our operations or our ability to incur additional indebtedness or pay dividends, among other items. If we raise additional funds through governmental funding, collaborations, strategic partnerships and alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. If we are not able to secure adequate additional funding, we may be forced to make reductions in spending, extend payment terms with suppliers, liquidate assets where possible, and/or suspend or curtail planned programs. Any of these actions could materially and adversely affect our business, financial condition, results of operations, cash flows and prospects.

Cash Flows

The following table provides information regarding our cash flows for the three months ended March 31, 2022 and 2021:



                                                                 Three Months Ended
                                                                     March 31,
(in thousands)                                                   2022           2021
Net cash (used in) provided by:
Operating activities                                         $  (13,951)     $ (7,326)
Investing activities                                                (28)          (13)
Financing activities                                                159          (538)

Net decrease in cash, cash equivalents and restricted cash $ (13,820) $ (7,877)

Operating Activities

Net cash used in operating activities for the three months ended March 31, 2022 was $14.0 million, compared to $7.3 million for the three months ended March 31, 2021. This increase of approximately $6.6 million was primarily attributable to an increase in net loss of $7.9 million for the three months ended March 31, 2022 compared to the three months ended March 31, 2021.

Investing Activities

Net cash used in investing activities for each of the three months ended March 31, 2022 and 2021 was nearly zero.

Financing Activities

Net cash provided by financing activities for the three months ended March 31, 2022 was $0.2 million, compared to $0.5 million used in financing activities for the three months ended March 31, 2021. This increase of $0.7 million was primarily attributable to costs incurred in connection with our IPO.

Contractual Obligations

Overview

In the normal course of business, we enter into agreements with CROs, contact manufacturers, vendors and other third parties for preclinical studies, manufacturing services and other services and products for operating purposes. These contracts do not contain minimum purchase commitments and are cancelable by us upon prior written notice. Payments due upon cancellation consist only of payments for services provided or expenses incurred, including noncancelable obligations of our service providers, up to the date of cancellation.

Term Loan Facility

See "Liquidity and Capital Resources - Sources of Liquidity - Term Loan Facility" for a description of our Loan Agreement. As of May 10, 2022, the Term Loans remain undrawn.

Clinical Trial Collaboration and Supply Agreement

In August 2021, we entered into a Clinical Trial Collaboration and Supply Agreement, or Clinical Supply Agreement, with Merck & Co., Inc., or Merck, to evaluate WTX-124 in combination with KEYTRUDA® (pembrolizumab), Merck's anti-PD-1 therapy. The planned clinical trial will be conducted by us and is designed to evaluate the safety and preliminary efficacy of WTX-124 as a monotherapy and in combination with pembrolizumab in patients with solid tumors. Under the terms of the Clinical Supply Agreement, we will sponsor the study



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and Merck will supply us with pembrolizumab in exchange for jointly owning any inventions or discoveries relative to the combined use of WTX-124 and pembrolizumab. Each party is responsible for its own internal costs and expenses to support the trial.

Lease Agreements

In April 2019, we entered into an operating lease for approximately 9,949 square feet of office and laboratory space which commenced in April 2019 and terminates in March 2024. Total estimated base rent payments over the remaining term of the lease are approximately $1.8 million.

In March 2021, we entered into a short-term lease for approximately 7,500 square feet of office and laboratory space which commenced in April 2021 and terminates in May 2022. Total estimated base rent payments over the remaining term of the lease are approximately $0.1 million.

In June 2021, we entered into an operating lease for approximately 25,778 square feet of office and laboratory space in Watertown, Massachusetts, which will serve as our future headquarters. The lease term is targeted to commence in May 2022 and has an approximate eight-year term. Total estimated base rent payments over the term of the lease are approximately $19.3 million.

Critical Accounting Policies and Estimates

Our management's discussion and analysis of our financial condition and results of operations is based on our condensed consolidated financial statements, which have been prepared in accordance with generally accepted accounting principles in the United States. The preparation of these condensed consolidated 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 and accompanying notes. On an ongoing basis, we evaluate our estimates which include, but are not limited to, leases, accrued expenses and stock-based compensation expense. We base our estimates on historical experience, known trends and events and various other factors that we believe to be 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. Our actual results may differ from those estimates under different assumptions or conditions.

There were no material changes to our critical accounting policies and estimates as reported in the Annual Report on Form 10-K.

JOBS Act Accounting Election and Smaller Reporting Company Implications

We are an emerging growth company, as defined in the Jumpstart Our Business Startups Act of 2012, as amended, or JOBS Act. For as long as we continue to be an emerging growth company, we may take advantage of exemptions from various reporting requirements that are applicable to other public companies that are not emerging growth companies, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act of 2002, as amended, or Sarbanes-Oxley Act. Under the JOBS Act, emerging growth companies can also delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have irrevocably elected not to avail ourselves of this extended transition period, and, as a result, we will adopt new or revised accounting standards on the relevant dates on which adoption of such standards is required for other public companies.

Even after we no longer qualify as an emerging growth company, we may still qualify as a "smaller reporting company," which would allow us to continue to take advantage of reduced disclosure requirements, including not being required to comply with the auditor attestation requirements of Section 404 of the Sarbanes-Oxley Act if we are a smaller reporting company with less than $100 million in annual revenue.

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