Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

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 elsewhere in this Quarterly Report on Form 10-Q. Some of the information contained in this discussion and analysis or set forth elsewhere in this Quarterly Report on Form 10-Q, 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 important factors, including those set forth in the “Risk Factors” section of our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, filed with the SEC on March 8, 2023, or the 2022 Form 10-K, and this Quarterly Report on Form 10-Q, our actual results could differ materially from the results described in, or implied, by these forward-looking statements.

Overview

We are a clinical stage biopharmaceutical company focused on developing and commercializing a pipeline of novel, proprietary therapeutics that have the potential to transform radiotherapy in cancer. We leverage our expertise in superoxide dismutase mimetics to design drugs to reduce normal tissue toxicity from radiotherapy and to increase the anti-cancer efficacy of radiotherapy. Avasopasem manganese (avasopasem, or GC4419) is a highly selective small molecule dismutase mimetic in development for the reduction of severe oral mucositis, or SOM, in patients with head and neck cancer, or HNC, and for the reduction of esophagitis in patients with lung cancer. We are also exploring the potential for avasopasem to reduce cisplatin-induced kidney damage. SOM is a common, debilitating complication of radiotherapy in patients with HNC. The U.S. Food and Drug Administration, or FDA, has granted Fast Track and Breakthrough Therapy designations to avasopasem for the reduction of SOM induced by radiotherapy. In February 2023, the FDA accepted and granted Priority Review designation to our New Drug Application, or NDA, for avasopasem for this indication. Our second dismutase mimetic product candidate, rucosopasem manganese (rucosopasem, or GC4711), is in clinical-stage development to augment the anti-cancer efficacy of stereotactic body radiation therapy, or SBRT, in patients with non-small cell lung cancer, or NSCLC, and locally advanced pancreatic cancer, or LAPC.

Radiotherapy-induced SOM can lead to devastating complications for patients. A majority will suffer severe pain which is often managed with the use of opioids. Patients with SOM are at risk of dehydration and malnutrition as a result of the inability to eat or drink, and often require nutrition through an intravenous line or surgical placement of a feeding tube. Each year in the United States approximately 67,000 patients are diagnosed with HNC, according to the American Cancer Society. In the five largest European markets, approximately 68,000 patients are diagnosed annually with HNC, and an additional 23,000 in Japan. We estimate that approximately 65% of patients diagnosed with HNC will be treated with radiotherapy. All patients with HNC treated with radiotherapy are at risk for developing SOM, which suggests a target patient population of approximately 43,500 patients in the United States alone for our lead indication. We believe that SOM in patients with HNC represents a total market opportunity of more than $1.5 billion in the United States based on branded supportive care price analogs. There are currently no FDA-approved drugs for SOM in these patients and we believe avasopasem, which to date is not approved for any indication, has the potential to become the standard of care for the reduction of SOM in patients with HNC receiving radiotherapy.

In December 2021, we announced topline efficacy results from a Phase 3 trial of avasopasem for the reduction of radiotherapy-induced SOM in patients with locally advanced HNC, which we refer to as the Reduction in Oral Mucositis with Avasopasem Manganese, or ROMAN, trial. The results demonstrated efficacy across multiple SOM endpoints with a statistically significant reduction on the primary endpoint of reduction in the incidence of SOM and a statistically significant reduction on the secondary endpoint of number of days of SOM, with a median of 18 days in the placebo arm versus 8 days in the avasopasem arm. We had previously announced topline results from the ROMAN trial in October 2021 that incorrectly stated the reduction on the primary endpoint was not statistically significant. Upon further analysis, an error by the contract research organization was identified in the statistical program. Correction of this error yielded the correct, statistically significant p-values for the primary and a key secondary endpoint. Exploratory analyses, such as time to SOM onset and SOM incidence at various landmarks of radiotherapy delivered, further demonstrated the potential clinical utility of avasopasem in reducing the burden of SOM. Avasopasem appeared to be generally well tolerated compared to placebo.

In October 2022, we announced the presentation of the one-year tumor and renal function outcomes data from the ROMAN trial as well as topline results from a recently completed meta-analysis of the ROMAN and GT-201 (Phase 2b) SOM trial results at the 2022 American Society for Radiation Oncology, or ASTRO, Annual Meeting. After one-year follow-up, patients with HNC treated with avasopasem in combination with the standard-of-care regimen (intensity-modulated radiation therapy, or IMRT, plus cisplatin) demonstrated comparable tumor outcomes and overall survival to patients in the placebo arm, showing that avasopasem protected HNC patients from SOM without affecting the treatment benefit of standard-of-care chemoradiotherapy. In addition, after one year of follow-up, patients treated with avasopasem in combination with IMRT plus cisplatin had a 10% incidence of chronic kidney disease, or CKD, compared to 20% of patients in the placebo arm, which was a pre-defined exploratory endpoint evaluating renal function. CKD (eGFR <60) is a known toxicity risk with cisplatin, which can have significant long-term consequences. The

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prospective exploration of this potential benefit of avasopasem was driven by published preclinical data and a post hoc assessment of patients from the GT-201 trial presented at the 2020 American Society of Clinical Oncology, or ASCO, Annual Meeting. We believe these CKD data suggest another potential benefit of avasopasem for these patients beyond reducing SOM. In addition to the ROMAN long-term endpoints, a meta-analysis of the Company’s two randomized placebo-controlled trials (ROMAN and GT-201; n=551) was included in the ASTRO presentation; these results reinforced that across both trials avasopasem therapy resulted in clinically meaningful improvements in radiotherapy-induced SOM, including reductions in the incidence, number of days, severity, and delay in the onset of SOM compared to placebo.

In December 2022, we submitted an NDA to the FDA for avasopasem for the reduction of radiotherapy-induced SOM in patients with HNC undergoing standard-of-care treatment. The NDA is supported by the data from the two randomized, double-blinded, placebo-controlled trials (ROMAN and GT-201), as well as data from other clinical trials of avasopasem in the proposed indication. In February 2023, the FDA accepted the NDA for filing and granted priority review with a Prescription Drug User Fee Act, or PDUFA, target date of August 9, 2023. The FDA indicated in its acceptance of filing letter that it is not planning to hold an advisory committee meeting on the application.

In December 2021, we also announced topline results from a Phase 2a multi-center trial in Europe assessing the safety and efficacy of avasopasem in patients with HNC undergoing standard-of-care radiotherapy, which we refer to as the EUSOM trial. Avasopasem appeared to be generally well tolerated, and the incidence of SOM and median number of days of SOM observed in the EUSOM trial were in line with the ROMAN trial results. We plan to meet with the European Medicines Agency, or EMA, in 2023 to discuss the potential registration pathway in Europe for avasopasem for radiotherapy-induced SOM.

In May 2022, we announced topline results from an open-label, single-arm Phase 2a trial evaluating avasopasem for its ability to reduce the incidence of radiotherapy-induced esophagitis in patients with lung cancer, which we refer to as the AESOP trial. This multi-center trial enrolled 39 patients (62 screened) of which 35 completed treatment with 60 gray of radiotherapy plus chemotherapy over six weeks. Of these 35 patients, 29 received at least five weeks of 90 mg of avasopasem on the days they underwent radiotherapy. These 29 patients were evaluated as the pre-specified per protocol population. The results demonstrated that avasopasem substantially reduced the incidence of severe esophagitis in patients with lung cancer receiving chemoradiotherapy compared to expectations based on review of historical data in the literature. Avasopasem was generally well tolerated. The adverse events experienced are comparable to those expected with chemoradiotherapy.

There are currently no FDA-approved drugs and no established guidelines for the treatment of radiotherapy-induced esophagitis. We intend to pursue a strategy for avasopasem, if approved for reduction in the incidence of SOM, that involves presenting the AESOP clinical data to entities like the National Comprehensive Cancer Network, or NCCN, to support the use of avasopasem to reduce esophagitis as a medically accepted indication in published drug compendia, notwithstanding that this indication may not be approved by the FDA.

In addition to developing avasopasem for the reduction of normal tissue toxicity from radiotherapy, we are developing our second dismutase mimetic product candidate, rucosopasem, to increase the anti-cancer efficacy of higher daily doses of radiotherapy, or SBRT. SBRT typically involves a patient receiving one to five large doses of radiotherapy, in contrast to the 30 to 35 small daily doses typical of intensity modulated radiation therapy, or IMRT. Clinically, SBRT is increasingly used in patients with certain tumors, such as LAPC and NSCLC, that are less responsive to the small daily doses typical of IMRT. Even with the use of SBRT, there is need for improvement in treatment outcomes for certain tumors. In September 2021, in support of rucosopasem, we announced final results from our pilot Phase 1/2 safety and anti-cancer efficacy trial of avasopasem in combination with SBRT in patients with unresectable or borderline resectable LAPC. In this proof-of-concept trial, improvements were observed with avasopasem plus SBRT in overall survival, progression-free survival, local tumor control and time to distant metastases relative to patients treated with placebo plus SBRT.

We used our observations from the pilot LAPC trial to inform the design of our rucosopasem clinical trials in combination with SBRT. We have successfully completed Phase 1 trials of intravenous rucosopasem in healthy volunteers and initiated a Phase 1/2 trial in patients with NSCLC in October 2020, which we refer to as the GRECO-1 trial, and in May 2021, initiated a Phase 2b trial in patients with LAPC, which we refer to as the GRECO-2 trial.

The GRECO-1 trial is supported in part by a Small Business Innovation Research grant from the National Cancer Institute, or NCI, of the National Institutes of Health, or NIH, for the investigation of our dismutase mimetics in combination with SBRT for the treatment of lung cancer. We intend for this trial to assess the anti-cancer efficacy and safety of rucosopasem in combination with SBRT. In June 2022, we reported interim results from the open-label Phase 1 stage of the trial with six months follow-up on all seven patients. Rucosopasem in combination with SBRT appeared to be well tolerated through the cutoff date of June 14, 2022. The most frequent adverse events were fatigue, cough, and nausea, which are common in patients with lung cancer receiving radiotherapy. Through six months, in-field partial responses were observed in three patients and stable disease was observed in three

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others based on RECIST criteria. These results included target tumor reductions in five patients of 61%, 58%, 33%, 29% and 27% and one patient with an 8% increase. Preservation of pulmonary lung function was also observed compared to our expectations based on review of historical literature evaluating pulmonary function in a similar patient population with SBRT alone. We expect to complete enrollment in the randomized, placebo-controlled Phase 2 stage of this trial in the second half of 2023, and topline data readout is expected in the second half of 2024.

The GRECO-2 trial is designed to assess rucosopasem in combination with SBRT in patients with LAPC, based on our observations from the pilot LAPC trial with avasopasem. The primary endpoint of this trial is overall survival. The trial is enrolling well. As a result, we plan to expand the target enrollment from 160 to 220 patients in order to accrue the necessary events (number of deaths) for data analysis sooner. We now expect to complete enrollment in the GRECO-2 trial in the first half of 2024, and topline data readout is expected by the end of 2024.

Since our inception, we have devoted substantially all of our resources to organizing and staffing our company, business planning, raising capital, acquiring and developing product and technology rights, and conducting research and development. We have incurred recurring losses and negative cash flows from operations and have funded our operations primarily through the sale and issuance of equity and proceeds received under the Amended and Restated Purchase and Sale Agreement, which we refer to as the Royalty Agreement, with Clarus IV Galera Royalty AIV, L.P., Clarus IV-A, L.P., Clarus IV-B, L.P., Clarus IV-C, L.P. and Clarus IV-D, L.P., or collectively, Blackstone or Blackstone Life Sciences (formerly known as Clarus Ventures). On February 17, 2023, we completed a registered direct offering, which resulted in the issuance and sale of 14,320,000 shares of our common stock and warrants to purchase up to 14,320,000 shares of common stock at a combined offering price of $2.095 per share and accompanying warrant, generating gross proceeds of $30.0 million. The warrants have an exercise price of $1.97 per share of common stock, are exercisable immediately following their issuance and will expire five years from the date of issuance. We received net proceeds of $27.6 million from this offering, after deducting placement agent fees and offering expenses.

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 current or future product candidates. Our net loss was $62.2 million and $80.5 million for the years ended December 31, 2022 and 2021, respectively, and $17.7 million for the three months ended March 31, 2023. As of March 31, 2023, we had $47.8 million in cash, cash equivalents and short-term investments and an accumulated deficit of $396.0 million. We expect to continue to incur significant expenses and operating losses for the foreseeable future as we operate as a public company, advance our product candidates through all stages of development and clinical trials, build our commercial infrastructure and, ultimately, seek regulatory approval of our product candidates. In addition, if we obtain marketing approval for any of our product candidates, we expect to incur significant commercialization expenses related to product manufacturing, marketing, sales and distribution.

As a result, we will need to raise substantial additional capital to support our continuing operations and pursue our growth strategy. Until such time as we can generate significant revenue from product sales, if ever, we plan to finance our operations through the sale of equity, debt financings or other capital sources, which may include collaborations with other companies or other strategic transactions. There is no assurance that we will be successful in obtaining an adequate level of financing as and when needed to finance our operations on terms acceptable to us or at all. If we are unable to secure adequate additional funding as and when needed, we may have to significantly delay, scale back or discontinue the development and commercialization of one or more product candidates or delay our pursuit of potential in-licenses or acquisitions.

Because of the numerous risks and uncertainties associated with product 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 product sales, 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 or terminate our operations.

We expect our existing cash, cash equivalents and short-term investments as of March 31, 2023 will enable us to fund our operating expenses and capital expenditure requirements into the fourth quarter of 2023, but not for more than one year after the date of the filing of this Quarterly Report on Form 10-Q, and as a result there is substantial doubt about our ability to continue as a going concern through the year from the date of the filing of this Quarterly Report on Form 10-Q. Our anticipated operating expenses involve significant risks and uncertainties and are dependent on our current assessment of the extent and costs of activities required to advance our product candidates. In the future, we anticipate that we will need to raise substantial additional financing to fund our operations through equity or debt financings, or through strategic transactions. To meet these requirements, we may seek to sell equity or convertible securities in public or private transactions that may result in significant dilution to our stockholders. We may offer and sell shares of our common stock under an existing registration statement or any registration statement we may file in the future. If we raise additional funds through the issuance of convertible securities, these securities could have rights senior to those of our common stock and could contain covenants that restrict our operations. We may also defer certain operating expenses unless and until additional capital is received. However, there can be no assurance that we will be successful in raising additional capital or that such

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capital, if available, will be on terms that are acceptable to us, or that we will be successful in deferring certain operating expenses. If we are unable to raise sufficient additional capital or defer sufficient operating expenses, we may be compelled to reduce the scope of our operations and planned capital expenditures and may decide to delay or discontinue certain activities, including planned research and development activities, hiring plans, manufacturing activities and commercial preparation efforts.

Business Update Regarding COVID-19

The current COVID-19 pandemic may continue to affect our employees, communities, clinical trial sites and business operations, as well as the U.S. economy and international financial markets. The full extent to which the COVID-19 pandemic will directly or indirectly impact our business, results of operations and financial condition will depend on future developments that are highly uncertain and cannot be accurately predicted, including the duration and potential resurgence of the pandemic. See “Risk Factors—Other Risks Related to Our Business—The COVID-19 pandemic has adversely impacted, and could continue to adversely impact, our business, including our preclinical studies and clinical trials, results of operations and financial condition” in Part I, Item 1A of the 2022 Form 10-K.

Our third-party contract manufacturing partners continue to operate at or near normal levels. While we currently do not anticipate any material interruptions in our clinical trial supply or manufacturing scale-up activities, it is possible that the COVID-19 pandemic and response efforts may have an impact in the future on our third-party suppliers and contract manufacturing partners' ability to manufacture our clinical trials supply or progress manufacturing scale-up activities.

We have also implemented measures designed to protect the health and safety of our workforce.

Critical Accounting Policies and Estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these consolidated financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, and expenses and the disclosure of contingent assets and liabilities in our financial statements. On an ongoing basis, we evaluate our estimates and judgments, including those described below. We base our estimates on historical experience, known trends and events, and various other factors that are believed 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. Actual results may differ from these estimates under different assumptions or conditions.

Our critical accounting policies are described under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies” in the 2022 Form 10-K and the notes to the unaudited interim consolidated financial statements appearing elsewhere in this Quarterly Report on Form 10-Q. During the three months ended March 31, 2023 there were no material changes to our critical accounting policies from those discussed in the 2022 Form 10-K.

Components of Results of Operations

Research and Development Expense

Research and development expenses consist primarily of costs incurred in connection with the discovery and development of our product candidates. We expense research and development costs as incurred. These expenses include:

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We track our external research and development expenses on a program-by-program basis, such as fees paid to CROs, CMOs and research laboratories in connection with our preclinical development, process development, manufacturing and clinical development activities. However, we do not track our internal research and development expenses on a program-by-program basis as they primarily relate to personnel-related and share-based compensation expense, early-stage research expenses and other costs that are deployed across multiple projects under development.

The following table summarizes our research and development expenses by program for the three months ended March 31, 2023 and 2022 (in thousands):

Research and development activities are central to our business model. Product candidates in later stages of clinical development, such as avasopasem, generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. Our research and development expenses may increase over the next several years as we increase personnel costs, including stock-based compensation, conduct our later-stage clinical trials for avasopasem and rucosopasem, if applicable, conduct other clinical trials for current and future product candidates and prepare regulatory filings for our product candidates.

The successful development of our product candidates is highly uncertain. At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the remainder of the development of our product candidates, including the significant costs associated with our ongoing and planned clinical trials, which likely will vary significantly as a result of many factors, including:

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Our research and development expenditures are subject to additional uncertainties, including the terms and timing of regulatory approvals. We may never succeed in achieving regulatory approval for our product candidates. We may obtain unexpected results from our clinical trials. We may elect to discontinue, delay or modify clinical trials of our product candidates. A change in the outcome of any of these variables with respect to the development of a product candidate could result in a significant change in the costs of and timing associated with the development of that product candidate. For example, if the FDA or other regulatory authorities were to require us to conduct clinical trials beyond those that we currently anticipate, or if we experience significant delays in enrollment in any of our clinical trials, we could be required to expend significant additional financial resources and time on the completion of clinical development.

General and Administrative Expense

General and administrative expense consists primarily of personnel expenses, including salaries, benefits and share-based compensation expense for employees in executive, finance, accounting, legal, information technology, commercial, business development and human resource functions. General and administrative expense also includes corporate facility costs, including rent, utilities, depreciation and maintenance, not otherwise included in research and development expense, as well as legal fees related to intellectual property and corporate matters and fees for accounting and consulting services.

We expect that our general and administrative expense will increase in the future to support our continued research and development activities, potential commercialization efforts, and to expand our operations and organizational capabilities. These increases will likely include increased costs related to the hiring of additional personnel, fees to outside consultants, lawyers and accountants and expenses related to services associated with maintaining compliance with the requirements of Nasdaq and the SEC, insurance and investor relations costs. Should we commercialize our product candidates, we expect to incur significantly increased expenses associated with building our commercial infrastructure.

Interest Income

Interest income consists of amounts earned on our cash and cash equivalents held with large institutional banks, U.S. Treasury obligations and a money market mutual fund invested in U.S. Treasury obligations, and our short-term investments in U.S. Treasury and government agency obligations.

Interest Expense

Interest expense consists of non-cash interest on proceeds received under the Royalty Agreement with Blackstone and non-cash interest expense associated with the amortization of the debt discount recorded for the Blackstone warrants.

Foreign Currency Loss

Foreign currency loss consists primarily of exchange rate fluctuations on transactions denominated in a currency other than the U.S. dollar.

Net Operating Loss and Research and Development Tax Credit Carryforwards

As of December 31, 2022, we had federal and state tax net operating loss carryforwards of $162.3 million and $184.4 million, respectively, which each begin to expire in 2032 unless previously utilized. We also had foreign net operating loss carryforwards of $1.7 million which do not expire. As of December 31, 2022, we also had federal, state and foreign research and development tax credit carryforwards of $7.3 million. The federal and state research and development tax credit carryforwards will begin to expire in 2032 and 2036, respectively, unless previously utilized. The foreign research and development tax credit carryforwards do not have an expiration date.

Utilization of the federal and state net operating losses and credits may be subject to a substantial annual limitation. The annual limitation may result in the expiration of our net operating losses and credits before we can use them. We have recorded a valuation allowance on substantially all of our deferred tax assets, including our deferred tax assets related to our net operating loss and research and development tax credit carryforwards, given the current uncertainty over our ability to utilize such amounts.

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