You should read the following discussion and analysis of our financial condition and results of operations together with our condensed financial statements and the related notes and other financial information included elsewhere in this Quarterly Report on Form 10-Q. This discussion and analysis contain forward-looking statements based upon our current plans and expectations that involve risks, uncertainties and assumptions, such as statements regarding our plans, objectives, expectations, intentions and beliefs. Our actual results and the timing of events could differ materially from those anticipated in these forward-looking statements as a result of various factors, including those set forth under the section titled "Risk Factors" and included in our Annual Report on Form 10-K for the year ended December 31, 2021. You should carefully read the sections titled "Note Regarding Forward-Looking Statements" and "Risk Factors" to gain an understanding of the important factors that could cause actual results to differ materially from the results described below.

Overview

We are a late-stage precision oncology company developing therapies that target oncogenic drivers for which we are able to genetically select patients we believe will be most likely to benefit. This approach includes using a tumor-agnostic strategy to select patients based on their tumors' underlying genetics rather than histology. We have in-licensed product candidates, each with a differentiated profile relative to available therapies, and we intend to continue strengthening our pipeline through focused business development and internal research efforts.

Our lead product candidate, milademetan (also known as RAIN-32) is a small molecule, oral inhibitor of mouse double minute 2 (MDM2), which may be oncogenic in numerous cancers. We in-licensed milademetan from Daiichi Sankyo in September 2020 based on the results of a Phase 1 clinical trial, which demonstrated meaningful antitumor activity in an MDM2-amplified subtype of liposarcoma (LPS) and other solid tumors. Data from well-differentiated/de-differentiated (WD/DD) LPS patients in the Phase 1 clinical trial of milademetan demonstrated median progression-free survival (mPFS) of approximately seven to eight months. Importantly, this result was accomplished with a rationally designed dosing schedule designed to mitigate safety concerns and widen the therapeutic window of MDM2 inhibition unlocking the potential for milademetan in a broad range of MDM2-dependent cancers. Based on these data, we commenced a pivotal Phase 3 trial in LPS (MANTRA) in July 2021. We also commenced a Phase 2 tumor-agnostic basket trial in certain solid tumors (MANTRA-2) in November 2021. We anticipate commencing a Phase 2 clinical trial in Merkel cell carcinoma (MCC) (MANTRA-3) in the fourth quarter of 2022 and a Phase 1/2 clinical trial to evaluate the safety, tolerability and efficacy of milademetan in combination with atezolizumab in patients with loss of cyclin-dependent kinase inhibitor 2A (CDKN2A) and wildtype p53 advanced solid tumors (MANTRA-4) in the fourth quarter of 2022. In addition to milademetan, we are also developing a preclinical program that is focused on inducing synthetic lethality in cancer cells by inhibiting RAD52.

Since our inception in 2017, we have incurred significant operating losses and have utilized substantially all of our resources to date in-licensing and developing our product candidates, organizing and staffing our Company and providing other general and administrative support for our operations. As of March 31, 2022, we had an accumulated deficit of $107.4 million and we incurred net losses of approximately $17.4 million and $6.8 million for the three months ended March 31, 2022 and 2021, respectively. Our operations to date have been funded primarily through the issuance of convertible promissory notes, the issuance of convertible preferred stock, as well as issuance and sale of common stock through our initial public offering (IPO). From our inception through March 31, 2022, we have raised aggregate gross proceeds of $9.9 million from the issuance of convertible promissory notes and $81.9 million from the issuance of convertible preferred stock. On April 27, 2021, we completed our IPO in which we issued and sold 7,352,941 shares of common stock at a public offering price of $17.00 per share. On May 11, 2021, we issued an additional 492,070 shares of common stock in connection with the exercise of the underwriters' option to purchase additional shares at the public offering price. Our net proceeds from the sale of shares in the IPO, including the sale of shares pursuant to the exercise of the underwriters' option to purchase additional shares, was $121.5 million, net of underwriting discounts and commissions, and other offering fees. As of March 31, 2022, we had cash, cash equivalents and short-term investments of $123.2 million. Although we believe, based on our current business plans, that our existing cash, cash equivalents and short-term investments will be sufficient to meet our obligations for at least the next twelve months, we anticipate that we will require additional capital in the future in order to continue the research and development of our drug candidates. Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our product candidates. We expect to continue to incur significant expenses and increasing operating losses for at least the next several years as we continue our development of, and seek regulatory approvals for, our product candidates and begin to commercialize any approved products, seek to expand our product pipeline, invest in our organization, as well as incur expenses associated with operating as a public company.

We do not expect to generate any revenue from product sales unless and until we successfully complete development and obtain regulatory approval for one or more product candidates, which will not be for many years, if ever. Accordingly, until such time as we can generate significant revenue from sales of our product candidates, if ever, we



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expect to finance our cash needs through public or private equity offerings, debt financings or other capital sources which may include strategic collaborations, licensing arrangements or other arrangements with third parties. We may be unable to raise additional funds or enter into such other agreements or arrangements when needed on favorable terms or at all. If we raise funds through strategic collaborations or other similar arrangements with third parties, we may have to relinquish valuable rights to our platform technology, future revenue streams, research programs or product candidates or we may have to grant licenses on terms that may not be favorable to us and/or may reduce the value of our common stock. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts. Our ability to raise additional funds may be adversely impacted by potential worsening of global economic conditions and disruptions to and volatility in the credit and financial markets in the United States and worldwide resulting from the ongoing COVID-19 pandemic or otherwise. Because of the numerous risks and uncertainties associated with our product development, we cannot predict the timing or amount of increased expenses and cannot assure you that we will ever be profitable or generate positive cash flow from operating activities. Based upon our current operating plan, we estimate that our cash, cash equivalents and short-term investments as of March 31, 2022 will be sufficient to fund our milademetan program.

We do not own or operate, and currently have no plans to establish, any manufacturing facilities. We currently rely and expect to continue to rely for the foreseeable future, on third parties for the manufacture of our drug candidates for preclinical and clinical testing, as well as for commercial manufacture of any drugs that we may commercialize. We expect to continue to develop drug candidates that can be produced cost-effectively at contract manufacturing facilities. For the milademetan program, we have transferred Daiichi Sankyo Company, Limited (Daiichi Sankyo) processes to suitable contract manufacturing organizations to supply active pharmaceutical ingredients and clinical drug product for our clinical trials and in preparation for submission of marketing applications and potential future commercial supplies.

COVID-19

The ongoing COVID-19 pandemic continues to rapidly evolve, and we will continue to monitor the COVID-19 situation closely. The extent of the impact of the COVID-19 pandemic 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 outbreak and its impact on our clinical trial enrollment, clinical trial sites, contract research organizations ("CROs"), third-party manufacturers and other third parties with whom we do business, as well as its impact on regulatory authorities and our key scientific and management personnel. Our ability to raise additional capital may be adversely impacted by potential worsening global economic conditions and the recent disruptions to and volatility in the credit and financial markets in the United States and worldwide resulting from the ongoing COVID-19 pandemic. To the extent possible, we are conducting business as usual, with necessary or advisable modifications, and most of our employees are working remotely. The increased reliance on our personnel working from home has not negatively impacted productivity, or disrupted, delayed or otherwise seriously harmed our business. The collection and integrity of subject data and clinical trial endpoints have not been negatively impacted by the COVID-19 pandemic. We will continue to monitor the evolving situation related to the COVID-19 pandemic and may take further actions that alter our operations, including those that may be required by federal, state or local authorities, including the ability of the FDA and other regulatory authorities to perform routine functions or that we determine are in the best interests of our employees and other third parties with whom we do business. If global health concerns prevent the FDA or other regulatory authorities from conducting their regular inspections, reviews or other regulatory activities, it could significantly impact the ability of the FDA or other regulatory authorities to timely review and process our regulatory submissions, which could have a material adverse effect on our business. At this point, the extent to which the COVID-19 pandemic may affect our business, operations and clinical development timelines and plans, including the resulting impact on our expenditures and capital needs, remains uncertain and is subject to change.

Recent Developments

In January 2022, we announced a clinical supply agreement with Roche for the supply of the anti-Programmed Death Ligand-1 (PD-L1) monoclonal antibody, atezolizumab. Clinical trials are planned to evaluate milademetan in combination with atezolizumab for the treatment of patients in genetically selected populations (MANTRA-4). Under this agreement, Rain is the sponsor of the anticipated clinical trials, and Roche will supply atezolizumab.

Our Development Pipeline

Our development pipeline is unified by a strategy to target oncogenic drivers through differentiated therapies for which we are able to genetically select the patients we believe will be most likely to benefit from treatment. We currently retain global development and commercialization rights to all of our product candidates.




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Milademetan Overview

Our lead product candidate, milademetan, is a small molecule, oral inhibitor of MDM2 and is being developed in patients with MDM2-dependent cancers. Historically, MDM2 inhibition has presented treatment challenges due to dose-limiting, on-target hematologic toxicities. We believe an MDM2-targeted therapy must possess certain pharmacological characteristics related to potency and pharmacokinetics to allow for the design of an optimized dosing schedule. An optimized dosing schedule is intended to improve peak drug exposure leading to apoptosis and cell cycle arrest during the dosing period, while permitting hematopoietic precursor cell recovery during the dosing break, thereby minimizing hematologic toxicity. Milademetan's differentiated profile, as a potent MDM2 inhibitor has enabled a rationally designed dosing schedule that we believe has the potential to reduce toxicities while preserving activity. We anticipate that this dosing schedule may also be applicable to other MDM2-dependent cancer populations across solid and hematologic tumor types.

In September 2020, we in-licensed milademetan from Daiichi Sankyo. Daiichi Sankyo previously conducted a Phase 1 clinical trial in WD/DD LPS patients. Liposarcomas are the most common sarcomas in adults. WD and DD LPS represent subtypes of LPS. The DD subtype often develops within WD tumor mass at disease progression or recurrence of resected WD LPS. WD/DD LPS tumors have nearly universal MDM2 amplification and wild type (WT) p53, and hence we believe WD/DD LPS patients represent an appropriate population for MDM2 inhibition therapy. Data from a WD/DD LPS patients in the Phase 1 clinical trial of milademetan demonstrated mPFS of approximately seven to eight months. Importantly, this result was accomplished with a rationally designed dosing schedule designed to mitigate safety concerns and widen the therapeutic window of MDM2 inhibition, establishing potential for a differentiated profile. In July 2021, we announced that the first patient has been randomized in the multicenter, open-label, Phase 3 registrational trial (MANTRA) evaluating milademetan for the treatment of DD LPS. Accordingly, pursuant to the Daiichi Sankyo License Agreement, the Company recorded $5.5 million in milestone fees as research and development expense in the condensed statement of operations for the three months ended September 30, 2021. Of the $5.5 million milestone fees, $2.5 million was paid in the third quarter of 2021 and $3.0 million was accrued as part of accrued research and development in the condensed balance sheet as of March 31, 2022 and December 31, 2021.

The MANTRA trial is designed to evaluate the safety and efficacy of milademetan compared to trabectedin, a current standard of care, in patients with unresectable or metastatic DD LPS with or without a WD LPS component that has progressed on one or more prior systemic therapies, including at least one anthracycline-based therapy. Approximately 160 patients are expected to be randomized in a 1:1 ratio to receive milademetan or trabectedin. The primary objective of the trial is to compare progression-free survival (PFS) by blinded independent review between the milademetan treatment arm and the trabectedin control arm. Secondary endpoints include overall survival, PFS by investigator assessment, objective response rate, duration of response, disease control rate, safety and patient reported outcomes. We anticipate top-line data from this trial in the first half of 2023. Our commencement of a Phase 3 trial following the Phase 1 trial referenced above is based on the data observed in the Phase 1 trial and FDA feedback with respect to our development plan.

In July 2021, we provided an update on patients who received milademetan monotherapy from the concluded Phase 1 dose escalation and expansion study. As of July 1, 2021, three WD/DD LPS patients received therapy with milademetan monotherapy for greater than 51 months. Two of these patients received therapy with durations of 51 and 57



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months without disease progression, and an additional patient received therapy for greater than 59 months before discontinuation in the second quarter of 2021. We believe this highlights the potential for milademetan to have a favorable long-term tolerability and safety profile.

In November 2021, we commenced of a multicenter, single arm open-label, Phase 2 basket trial evaluating milademetan, for the treatment of MDM2-amplified advanced solid tumors (MANTRA-2). The MANTRA-2 trial is designed to evaluate the safety and efficacy of milademetan in patients with advanced or metastatic solid tumors refractory or intolerant to standard-of-care therapy and that exhibit wild-type p53 and a prespecified minimum MDM2 gene copy number. Approximately 65 patients are expected to be enrolled to receive milademetan. The primary endpoint of the trial is objective response rate as measured by RECIST criteria. Secondary endpoints include duration of response, disease control rate progression-free survival by investigator assessment, overall survival, and growth modulation index. An interim analysis from MANTRA-2 is anticipated in the fourth quarter of 2022.

In November 2021, we announced a plan to commence a Phase 2 clinical trial, named MANTRA-3, evaluating the efficacy of milademetan, as a monotherapy for the treatment of patients with MCC refractory to ICI. The Phase 2 clinical trial in MCC (MANTRA-3) is on track to commence in the fourth quarter of 2022. The MANTRA-3 trial is designed to evaluate the efficacy of milademetan, as a monotherapy in patients with MCC that have progressed on immune checkpoint inhibitors. Approximately 34 patients are expected to be enrolled to receive milademetan. The primary endpoint of the trial is objective response rate as measured by RECIST criteria. Secondary endpoints include duration of response, disease control rate, progression free survival by investigator assessment, growth modulation index, overall survival and safety. We plan to prioritize our financial resources towards a Phase 2 clinical trial of milademetan in MCC and replace the previously planned Phase 2 clinical trial of milademetan in intimal sarcoma.

In January 2022, we announced a clinical supply agreement with Roche for the supply of the anti-Programmed Death Ligand-1 (PD-L1) monoclonal antibody, atezolizumab. Clinical trials are planned to evaluate milademetan in combination with atezolizumab for the treatment of patients in genetically selected populations. Under this agreement, we are the sponsor of the anticipated clinical trials, and Roche will supply atezolizumab. An initial Phase 1/2 clinical trial is planned to evaluate the safety, tolerability and efficacy of milademetan in combination with atezolizumab in patients with loss of CDKN2A and wildtype p53 advanced solid tumors who have previously progressed on ICI. We anticipate the start of the Phase 1/2 clinical trial in the fourth quarter of 2022. Subsequent Phase 2 clinical trials evaluating the combination of milademetan and atezolizumab may span various additional tumor types.

RAD52 and p53 Overview

We are also developing a preclinical program focused on targeting RAD52 in the DNA damage repair pathway. While our RAD52 program is in an early stage of development, we expect to develop this program for patients with a molecularly diagnosed HRD+, such as mutations and loss-of-function in BRCA1/2 or others that utilize RAD52 as an alternative DNA repair pathway, as well as for patients that may have relapsed to poly (ADP ribose) polymerase (PARP) inhibitor therapy. There are currently no approved therapies or clinical programs in development targeting RAD52.

Targeting RAD52 represents a novel strategy for tumors exhibiting tumor HRD+ or a loss of function, of several pathway constituents, including BRCA1/2 or others in tumor types frequently characterized by these deficiencies. These tumors include breast, prostate, pancreatic, ovarian and possibly other cancers. Developmental paths for RAD52 inhibitors include as a monotherapy in HRD+ patients relapsing on PARP inhibitor therapy, or in front-line combinations with PARP inhibitors in HRD+ tumors.

Our RAD52 program is currently in lead optimization stage. We anticipate evaluating identified RAD52 inhibitor candidates in animal models of patient tumors with HRD+ that have relapsed on PARP inhibitors and in HRD+ tumors with a loss-of-function mutation of BRCA1/2 in combination with PARP inhibitors.

Milademetan reactivates p53, known as the "guardian of the genome," by inhibiting MDM2. p53 is present in every cell and acts as a key regulator of a variety of cellular processes including cell cycle, DNA repair and apoptosis. In a normal cell, the activity of p53 is controlled and regulated by the inhibitory protein MDM2. MDM2 binds to p53, thereby inducing degradation and allowing normal cells to function properly. In response to cell damage and other stress conditions, p53 is activated and prevents the formation of cancerous cells by inducing apoptosis.

In contrast to normal cells, in tumor cells, the two primary mechanisms by which p53 can be inactivated in tumor cells are mutations in p53 and activation or overexpression of MDM2. Approximately half of all tumors are characterized by mutations of the p53 gene. The remaining cancer patients have a p53 gene that is not mutated, and is otherwise known as WT p53, but can be functionally suppressed through the activation or overexpression of MDM2. We have identified MDM2 dependence in several solid tumors. This dependence is caused by overexpression of MDM2 through gene amplification or other mechanisms, loss of a negative regulator of MDM2 or other causes. Overexpression of MDM2 promotes the degradation of p53 and also eliminates p53's ability to activate transcription. Milademetan, by binding MDM2



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at the p53 interaction site, prevents the formation of the MDM2- p53 complex, allowing p53 reactivation and subsequent transcription of genes, such as MIC-1, that trigger cancer cell cycle arrest or apoptosis, among others.

Collaboration and License Agreements

We are party to a number of license agreements for the in-license of our product candidates and development programs. See Note 7 to the Condensed Financial Statements.

Components of Our Results of Operations

Revenue

To date, we have not generated any revenue from product sales, licenses or collaborations and do not expect to generate any revenue from the sale of products in the foreseeable future. If our development efforts for our product candidates are successful and result in regulatory approval, we may generate revenue from future product sales. If we enter into license or collaboration agreements for any of our product candidates or intellectual property, we may generate revenue in the future from payments as a result of such license or collaboration agreements. We cannot predict if, when, or to what extent we will generate revenue from the commercialization and sale of our product candidates or from license or collaboration agreements. We may never succeed in obtaining regulatory approval for any of our product candidates.

Operating Expenses

Our operating expenses since inception have consisted solely of research and development costs, including acquisition of in-process research and development, and general and administrative costs.

Research and Development Expenses

To date, our research and development expenses have related to the discovery and clinical development of our product candidates, including acquisition of in-process research and development. Research and development expenses are recognized as incurred and payments made prior to the receipt of goods or services to be used in research and development are capitalized until the goods or services are received.

Research and development expenses include:


      •  salaries, payroll taxes, employee benefits and stock-based compensation
         charges for those individuals involved in research and development
         efforts;


      •  expenses incurred in connection with research, laboratory consumables and
         preclinical studies;


      •  external research and development expenses incurred under agreements with
         CROs and consultants to conduct and support our planned clinical trials
         of our product candidates;


      •  the cost of consultants engaged in research and development-related
         services and the cost to manufacture drug product for use in our
         preclinical studies and clinical trials;


  • costs related to regulatory compliance;


      •  the cost of annual license fees and the cost of
         acquiring in-process research and development, including upfront license
         payments; and


      •  any development milestone payments that we may make under our license
         agreements.

We track external development costs by product candidate or development program, but we do not allocate personnel costs or other internal costs to specific development programs or product candidates as our personnel works across multiple development programs and product candidates. These costs are included in unallocated research and development expenses in the table below.



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The following table summarizes our research and development expenses by product candidate or development program:



                                                        Three Months Ended
                                                             March 31,
                                                         2022          2021
                                                          (in thousands)
Milademetan                                           $     8,551     $ 2,404
Other research and clinical candidates                        250       1,078

Unallocated internal research and development costs 4,754 1,846 Total research and development expenses

$    13,555     $ 5,328

We plan to substantially increase our research and development expenses for the foreseeable future as we continue to expand the development of our product candidates. We cannot predict with certainty the timing for initiation or completion of, the duration of, or the costs of current or future clinical trials and nonclinical studies of any of our product candidates due to the inherently unpredictable nature of clinical and preclinical development. The clinical development timeline, probability of success of clinical trials 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.

Our future clinical development costs may vary significantly. See the section titled "Risk Factors-Risks Related to Product Development-Preclinical and clinical development involves a lengthy and expensive process with uncertain outcomes, and results of earlier studies and trials may not be predictive of future clinical trial results. If our preclinical studies and clinical trials are not sufficient to support regulatory approval of any of our product candidates, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development of such product candidates" in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2021.

General and Administrative Expenses

General and administrative expenses consist of salaries and employee-related costs, including stock-based compensation, for personnel in executive, finance and other administrative functions, legal fees relating to intellectual property and corporate matters, professional fees for accounting and consulting services and facility-related costs. We anticipate that our general and administrative expenses will continue to increase in the future to support our continued research and development activities, pre-commercial preparation activities for our product candidates and, if any product candidate receives marketing approval, commercialization activities. We also anticipate increased expenses related to audit, legal, regulatory and tax-related services associated with maintaining compliance with exchange listing and SEC requirements, director and officer insurance premiums and investor relations costs associated with operating as a public company.

Interest Income

For the three months ended March 31, 2022, interest income consists of interest on our money market accounts and short-term investments. For the three months ended March 31, 2021, interest income consists of interest on our money market account.



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Results of Operations

Comparison of Three Months Ended March 31, 2022



The following table summarizes our results of operations for the three months
ended March 31, 2022 and 2021, together with the changes in those items in
dollars:


                               Three Months Ended
                                    March 31,
                                2022          2021        Change
                                 (in thousands)
Operating expenses:
Research and development     $   13,555     $  5,328     $   8,227
General and administrative        3,895        1,480         2,415
Total operating expenses         17,450        6,808        10,642
Loss from operations            (17,450 )     (6,808 )     (10,642 )
Other income:
Interest income                      56            8            48
Net loss                     $  (17,394 )   $ (6,800 )   $  10,594

Research and Development Expenses

Research and development (R&D) expenses were $13.6 million and $5.3 million for the three months ended March 31, 2022 and 2021, respectively. The increase in R&D expenses was primarily related to milademetan and other research costs. Non-cash stock-based compensation expenses, included as part of personnel costs, were $0.9 million and $0.1 million for the three months ended March 31, 2022 and 2021, respectively. We expect our R&D costs to continue to increase in 2022 as we continue our Phase 3 trial in LPS and our Phase 2 tumor-agnostic basket trial for milademetan.

General and Administrative Expenses

General and administrative (G&A) expenses were $3.9 million and $1.5 million for the three months ended March 31, 2022 and 2021, respectively. The increase in G&A expenses was primarily due to director and officer insurance of $0.8 million, payroll-related costs of $ 1.1 million and various third-party G&A costs of $2.0 million. Non-cash stock-based compensation expense included in G&A expenses was approximately $0.4 million and $31,000 for the three months ended March 31, 2022 and 2021, respectively. We have incurred and expect to continue incur additional expenses as a result of being a public company following the completion of our IPO in April 2021, including costs associated with maintaining compliance with exchange listing and SEC requirements. In addition, we expect our general and administrative expenses to continue to increase in 2022 as we continue to add personnel and build out systems and infrastructure to support our operations.

Other (Income) Expense

Other income for the three months ended March 31, 2022 and 2021 represents interest income from money market or short-term investments.

Liquidity and Capital Resources

Since our inception, we have incurred significant operating losses. We expect to continue to incur significant expenses and operating losses for the foreseeable future as we advance the preclinical and clinical development of our research programs and product candidates. We expect that our research and development and general and administrative costs will increase in connection with conducting additional preclinical studies and clinical trials, expanding our intellectual property portfolio and providing general and administrative support for our operations. As a result, we will need additional capital to fund our operations, which we may obtain from additional equity or debt financings, collaborations, licensing arrangements or other sources.

We do not currently have any approved products and have not generated any revenue from product sales since inception. To date, we have financed our operations through the issuance of convertible promissory notes and the issuance of convertible preferred stock and common stock. From our inception through March 31, 2022 we have raised aggregate gross proceeds of $9.9 million from the issuance of convertible promissory notes and $81.9 million from the issuance of convertible preferred stock. On April 27, 2021, we completed our IPO in which we issued and sold 7,352,941 shares of common stock at a public offering price of $17.00 per share. On May 11, 2021, we issued an additional 492,070



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shares of common stock in connection with the exercise of the underwriters' option to purchase additional shares at the public offering price. Our net proceeds from the sale of shares in the IPO, including the sale of shares pursuant to the exercise of the underwriters' option to purchase additional shares, was $121.5 million, net of underwriting discounts and commissions, and other offering fees. As of March 31, 2022, we had cash, cash equivalents and short-term investments of $123.2 million. Although we believe, based on our current business plans, that our existing cash, cash equivalents and short-term investments will be sufficient to meet our obligations for at least the next twelve months, we anticipate that we will require additional capital in the future in order to continue the research and development of our drug candidates. We have based this estimate on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we expect.

Future Funding Requirements

We expect our expenses to increase substantially in connection with our ongoing development activities related to milademetan and other product candidates and programs, which are still in the early stages of development. In addition, we expect to incur additional costs associated with operating as a public company. We expect that our expenses will increase substantially if and as we:


      •  continue our on-going clinical trials, initiate new clinical trials
         for our milademetan program and incur additional preclinical research
         costs for our RAD52 program;


      •  initiate and continue research and preclinical and clinical development
         of our product candidates;


  • seek to identify and develop additional product candidates;


      •  seek marketing approvals for any of our product candidates that
         successfully complete clinical trials, if any;


      •  establish a sales, marketing, manufacturing and distribution
         infrastructure to commercialize any products for which we may obtain
         marketing approval;


      •  require the manufacture of larger quantities of our product
         candidates for clinical development and potentially
         commercialization;


  • maintain, expand, protect and enforce our intellectual property portfolio;


  • acquire or in-license other drugs and technologies;


      •  defend against any claims of infringement, misappropriation or other
         violation of third-party intellectual property;


      •  hire and retain additional clinical, quality control and scientific
         personnel;


      •  build out new facilities or expand existing facilities to support our
         ongoing development activity;


      •  add operational, financial and management information systems and
         personnel, including personnel to support our drug development, and
         any future commercialization efforts; and


      •  potentially experience the effects of the recent disruptions to and
         volatility in the credit and financial markets in the United States and
         worldwide from the ongoing COVID-19 pandemic and the geopolitical
         environment.

Because of the numerous risks and uncertainties associated with the development of milademetan and other product candidates and programs and because the extent to which we may enter into collaborations with third parties for development of our product candidates is unknown, we are unable to estimate the timing and amounts of increased capital outlays and operating expenses associated with completing the research and development of our product candidates and programs. Our future capital requirements will depend on many factors, including:


      •  the scope, progress, results and costs of our current and future
         clinical trials of milademetan for our current targeted indications;


      •  the scope, progress, results and costs of drug discovery, preclinical
         research and clinical trials for RAD52 and other product candidates;


      •  the number of future product candidates that we pursue and their
         development requirements;


  • the costs, timing and outcome of regulatory review of our product candidates;


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      •  the extent to which we acquire or invest in businesses, products and
         technologies, including entering into or maintaining licensing or
         collaboration arrangements for product candidates on favorable terms,
         although we currently have no commitments or agreements to complete
         any such transactions;


      •  the costs of preparing, filing and prosecuting patent applications,
         maintaining, protecting and enforcing our intellectual property
         rights and defending intellectual property-related claims;


      •  our headcount growth and associated costs as we expand our business
         operations and our research and development activities;


      •  our ability to successfully acquire or in-license other drugs and
         technologies;


      •  the costs and timing of future commercialization activities, including
         drug sales, marketing, manufacturing and distribution, for any of our
         product candidates for which we receive marketing approval, to the
         extent that such sales, marketing, manufacturing and distribution are
         not the responsibility of any collaborator that we may have at such
         time;


      •  the amount of revenue, if any, received from commercial sales of
         our product candidates, should any of our product candidates
         receive marketing approval; and

Developing drug products, including conducting preclinical studies and clinical trials, is a time-consuming, expensive and uncertain process that takes years to complete, and we may never generate the necessary data or results required to obtain marketing approval for any product candidates or generate revenue from the sale of any products for which we may obtain marketing approval. In addition, our product candidates, if approved, may not achieve commercial success. Our commercial revenues, if any, will be derived from sales of drugs that we do not expect to be commercially available for many years, if at all. Accordingly, we will need to obtain substantial additional funds to achieve our business objectives.

Until such time, if ever, as we can generate product revenues to support our cost structure, we expect to finance our cash needs through public or private equity offerings, debt financings or other capital sources which may include strategic collaborations, licensing arrangements or other arrangements with third parties. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interest of our stockholders could be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our stockholders. Debt financing and equity financing, if available, may involve agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If we raise funds through strategic collaborations or other similar arrangements with third parties, we may have to relinquish valuable rights to our technology, future revenue streams, research programs or product candidates or may have to grant licenses on terms that may not be favorable to us and/or may reduce the value of our common stock. If we are unable to raise additional funds through equity or debt financings when needed, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts. Our ability to raise additional funds may be adversely impacted by potential worsening global economic conditions and disruptions to and volatility in the credit and financial markets in the United States and worldwide resulting from the ongoing COVID-19 pandemic and geopolitical events or otherwise. Because of the numerous risks and uncertainties associated with product development, we cannot predict the timing or amount of increased expenses and cannot assure you that we will ever be profitable or generate positive cash flow from operating activities.

Cash Flows



The following table summarizes our sources and uses of cash and cash
equivalents:

                                              Three Months Ended
                                                   March 31,
                                               2022          2021
                                                (in thousands)
Net cash provided by (used in):
Operating activities                        $  (17,110 )   $ (4,866 )
Investing activities                            13,436          (29 )
Financing activities                               399         (858 )

Net decrease in cash and cash equivalents $ (3,275 ) $ (5,753 )




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Operating Activities

We have incurred losses since inception. Net cash used in operating activities for the three months ended March 31, 2022 was $17.1 million, consisting primarily of net loss of $17.4 million resulting from expenses associated with research and development activities for our lead product candidate and general and administrative expenses. A net decrease in changes in operating assets and liabilities of $1.0 million also contributed to the use of cash. Partially offsetting the cash use was the non-cash stock compensation adjustment of $1.2 million.

Net cash used in operating activities for the three months ended March 31, 2021 was $4.9 million, consisting primarily of net loss of $6.8 million, resulting from expenses associated with research and development activities for our lead product candidate and general and administrative expenses, partially offset by changes in operating assets and liabilities of $1.8 million and non-cash adjustments of $0.2 million.

Investing Activities

Net cash provided by investing activities for the three months ended March 31, 2022 was $13.4 million, which was primarily related to $23.0 million of proceeds received from available for sale securities maturities. Purchases of available for sale securities during the period amounted to $9.5 million.

Net cash used in investing activities for the three months ended March 31, 2021 was $29,000 to purchase of property and equipment.

Financing Activities

Net cash provided by financing activities in the three months ended March 31, 2022 was $0.4 million, which primarily relates to the net proceeds from option exercises and ESPP purchases.

Net cash used in financing activities in the three months ended March 31, 2021 was $0.9 million, which primarily relates to payments for deferred IPO offering costs.

Obligations and other Commitments

As discussed in Note 8 to the condensed financial statements appearing elsewhere in this Quarterly Report on Form 10-Q, we are party to agreements to license intellectual property. The license agreements may require us to pay future milestones if certain developmental, regulatory and commercial milestones are achieved, as well as to pay royalties on net sales of products applicable to the license agreements. We cannot estimate if milestone and/or royalty payments will occur in future periods and the agreements are cancelable by us at any time upon prior written notice to the licensor.

In the normal course of business, we enter into contracts with CROs and other vendors for preclinical studies and clinical trials, research and development supplies and other testing and manufacturing services. These contracts generally do not contain minimum purchase commitments and are cancelable by either party at any time upon prior written notice.

Our incurred and accrued research and development obligations as of March 31, 2022 and December 31, 2021 were $5.4 million and $4.3 million, respectively.

There were no material changes outside of the ordinary course of business to our specific contractual obligations during the three months ended March 31, 2022.

Critical Accounting Policies and Use of Estimates

There have been no significant changes to our critical accounting policies and use of estimate from our disclosure reported in "Critical Accounting Estimates" in the section titled "Management's Discussion and Analysis of Financial Condition and Results of Operations" in the Form 10-K for the year ended December 31, 2021, except as described in Note 2 to the interim unaudited condensed financial statements included elsewhere in this Quarterly Report on Form 10-Q.

Accrued Liabilities

We are required to estimate our expenses resulting from our obligations under contracts with vendors, consultants, CROs and clinical site agreements in connection with conducting preclinical activities and clinical trials. The financial terms of these contracts are subject to negotiations which vary from contract to contract and may result in payment flows that do not match the periods over which materials or services are provided under such contracts. 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. However, some payments are made in arrears and expenditures are accrued for the time periods which services are performed on a pre-determined schedule or when contractual milestones are met. Payments



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under some of these contracts depend on factors such as the successful enrollment of patients and the completion of clinical trial milestones.

This process involves reviewing open contracts and purchase orders, communicating with our applicable personnel to identify services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred when we have not yet been invoiced or otherwise notified of actual costs. During the course of a preclinical study or clinical trial, we adjust our prepaid and expense recognition if actual results differ from our estimates. To date, we have not experienced any material differences between accrued costs and actual costs incurred. The accrued research and development balances were $5.4 million and $4.3 million as of March 31, 2022 and December 31, 2021, respectively. The other accrued liabilities balances were $4.5 million and $5.7 million as of March 31, 2022 and December 31, 2021, respectively.

Stock-Based Compensation

We follow the provision of the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 718, "Compensation - Stock Compensation" (ASC 718), which requires the measurement and recognition of compensation expense for all stock-based payment awards.

We estimate the fair value of our stock options using the Black-Scholes option pricing model, which requires us to develop estimates to be used in calculating the fair value of stock options. The use of the model requires us to make estimates of assumptions, such as expected stock price volatility and the estimated expected term of each award.

Stock-based compensation expense based on the fair value estimated is recognized over the requisite service period of the awards (generally the vesting period) on a straight-line basis. Prior to the IPO, the estimated fair value of the underlying common stock as determined on the date of grant by our Board of Directors. For the three months ended March 31, 2022 and 2021, stock-based compensation expense was $1.2 million and $0.2 million, respectively. The following table summarizes unvested equity compensation costs not yet recognized as of March 31, 2022 and December 31, 2021.




                                                   As of March 31,       As of December 31,
                                                        2022                    2021
Unvested equity compensation costs not yet
recognized (in millions)                          $            14.2     $                9.8
Weighted average period over which the unvested
awards are expected to be recognized (in years)                 3.2                      3.1


Recent Accounting Pronouncements

A description of recent accounting pronouncements that may potentially impact our financial position, results of operations or cash flows is disclosed in Note 2 to our unaudited condensed financial statements included elsewhere in this Quarterly Report on Form 10-Q.

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