ONC-212

– ONC201 Phase 3 ACTION Study Planned to Initiate This Year – –~$32M in Revenue from International TEMBEXA Agreements Recently Recognized– – U.S. Anti-Trust Clearance Obtained for Sale of TEMBEXA to Emergent BioSolutions – – Conference Call at 4:30 p.m. ET Today – DURHAM, N.C., Aug. 08, 2022 (GLOBE NEWSWIRE) -- Chimerix (NASDAQ:CMRX), a biopharmaceutical company whose mission it is to develop medicines that meaningfully improve and extend the lives of patients facing deadly diseases, today reported financial results for the second quarter ended June 30, 2022 and provided an operational update. “We are pleased to announce the design of Phase 3 study of ONC201 for the treatment of H3 K27M mutant glioma (the ACTION study), following feedback from the U.S. Food and Drug Administration (FDA),” said Mike Sherman, Chief Executive Officer of Chimerix. “H3 K27M-mutant glioma is an invariably lethal form of brain cancer and is associated with a dismal survival expectation, making this mutation one of the worst prognoses among brain tumors. Patients desperately need new treatment alternatives. We believe this is the most advanced clinical program in development targeting this mutation and we are working with urgency to make this study available to patients. Our optimism for a successful outcome in this study is based on the characteristics of the Phase 2 data which, collectively, are differentiated from other drugs which have been evaluated in Phase 3 in the broader glioblastoma population. These characteristics include: selection of patients with a genetically specified mutation, isolation of single agent activity, observed durable responses using RANO criteria, absence of anti-angiogenic drugs which can confound imaging to yield false response or progression assessments, and consistency across multiple clinically meaningful endpoints.” "The study will evaluate the weekly dose of ONC201 used across many clinical studies where durable tumor response has been observed in the relapsed setting. In addition, a twice per week dosing schedule will also be evaluated. This capitalizes on the safety profile of this agent and has the potential to bolster efficacy. The design positions the study to have multiple ways to achieve success,” said Dr. Timothy Cloughesy, M.D., Professor of Neurology and Molecular and Medical Pharmacology at the University of California, Los Angeles and Global Principal Investigator for the ACTION study. "Our center is excited to participate in the upcoming ACTION Study. We expect several factors to favorably impact enrollment, including the combined RANO-HGG/LGG response rate of 30% observed after treatment with ONC201 in the relapse setting, the durability of those responses, the 2:1 ratio of patients to receive ONC201, and the sequencing of treatment to begin shortly after completion of radiation,” said Dr. Isabel Arrillaga-Romany, MD, PhD, Director of Neuro-Oncology Clinical Trials, Massachusetts General Hospital Cancer Center. Program Updates Phase 3 ACTION Study of ONC201 for Treatment of H3 K27M-mutant Glioma The ACTION study is a randomized, double-blind, placebo-controlled, multicenter international study in newly diagnosed diffuse glioma patients whose tumor harbors an H3 K27M-mutation. Treatment with ONC201 will occur shortly after completion of radiation therapy. The study is designed to enroll 450 patients randomized 1:1:1 to receive ONC201 at one of two dosing frequencies or placebo. Activation of sites is expected to begin by year-end and continue into the first half of next year. Participants will be randomized to receive 625mg of ONC201 once per week, 625mg twice per week on two consecutive days or placebo. The dose will be scaled by body weight for pediatric patients. The primary endpoint of the study is overall survival (OS). The study will also evaluate progression free survival (PFS) with alpha control for both OS and PFS endpoints. OS will be assessed for efficacy at three alpha-allocated timepoints: two interim assessments by the Independent Data Monitoring Committee (IDMC) at 164 events and 246 events, respectively, and a final assessment at 327 events. The final PFS analysis will be performed after 286 events, with progression assessed using RANO HGG criteria by blinded independent central review (BICR). Secondary endpoints include corticosteroid response, performance status response, change from baseline in quality of life (QoL) assessments and change from baseline in neurologic function as assessed by the Neurologic Assessment in Neuro-Oncology (NANO) scale. Participants in the study must have a Karnofsky or Lansky performance status, a measure of patients’ ability to perform ordinary tasks, of >70 at time of randomization. Key exclusion criteria are the presence of a primary spinal tumor, diffuse intrinsic pontine glioma, evidence of leptomeningeal spread of disease or cerebrospinal fluid dissemination. Stratification factors include age (<21 years, >21 years), and an assessment of risk factors including tumor location, tumor size, and number of tumors. The study will take place at up to 120 sites in North America, Europe and Asia Pacific. The first interim analysis is anticipated in early 2025 with final data in 2026. The study has >80% power with an assumed hazard ratio of 0.65 for OS and 0.60 for PFS. Independent comparisons will be performed for each ONC201 group versus control at each timepoint. TEMBEXA In June, Chimerix announced two international procurement contracts for TEMBEXA (brincidofovir), including a $25.3 million agreement with the Public Health Agency of Canada (PHAC) and a $9.3 million procurement agreement with a third party outside of North America. The majority of the volume to satisfy these orders was delivered in July 2022 resulting in approximately $32.0 million of revenue recognized during that period. In May, Chimerix entered into an agreement with Emergent BioSolutions (EBS) for the sale of worldwide rights to TEMBEXA for $225 million upfront, potential additional milestones of up to $112.5 million and additional double-digit royalties on gross profit internationally and on gross profit associated with volumes greater than 1.7 million treatment courses in the U.S. (the “Transaction”). On July 29, 2022, the waiting period expired under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (HSR) in connection with the Transaction. This satisfies the closing condition related to the U.S. antitrust clearance of the Transaction. The Transaction remains subject to satisfaction of other closing conditions including the execution of the U.S. Biomedical Advanced Research and Development Authority (BARDA) procurement contract and the approval of the pre-novation agreement between Chimerix and EBS by BARDA. Negotiations with BARDA for the procurement of TEMBEXA into the Strategic National Stockpile are now in the final stages. Other Programs The Chimerix pipeline includes development of ONC206, ONC212 and CMX521. These programs are being developed in collaboration with various institutions and universities to leverage external capital in bringing each program to its next inflection point. ONC206 is a second generation imipridone where pre-clinical models indicate potentially improved, anti-cancer activity relative to ONC201. ONC206 is currently being evaluated in Phase I dose escalation trials in partnership with the National Institutes of Health (NIH) and with the Pacific Pediatric Neuro-Oncology Consortium (PNOC). ONC206 is being considered for development in solid tumors, including potentially adrenal tumors, endometrial cancer and central nervous system (CNS) tumors. ONC212, which targets GPR132 and ClpP, is in ongoing IND-enabling toxicology studies which are expected to be completed in Q4 2022 with a decision to enter clinical studies expected in 1H 2023. ONC212 is being explored pre-clinically in hematological malignancies, including AML, in partnership with MD Anderson Cancer Center and in solid tumors, including pancreatic cancer, in partnership with Brown University. A $3.4 million grant awarded to Brown University supports completion of IND-enabling studies and a potential first-in-human clinical trial. Development of CMX521 remains ongoing as a potential prophylactic and treatment of SARS-CoV-2 (COVID-19) infection in collaboration with the Rapidly Emerging Antiviral Drug Development Initiative (READDI) at the University of North Carolina at Chapel Hill (UNC). The pre-clinical collaboration is currently focused on determining the potential for CMX521 to be delivered orally (vs inhaled) to the pulmonary system. Second Quarter 2022 Financial Results Chimerix reported a net loss of $23.5 million, or $0.27 per basic and diluted share, for the second quarter of 2022. During the same period in 2021, Chimerix recorded a net loss of $17.8 million, or $0.21 per basic and diluted share. Revenues for the second quarter of 2022 and 2021 were $0.4 million. Revenue related to the previously mentioned TEMBEXA contracts will be recognized in the third quarter. Research and development expenses increased to $18.0 million for the second quarter of 2022, compared to $13.8 million for the same period in 2021 driven primarily by higher investments in ONC201 compared to the same period last year. General and administrative expenses increased to $5.8 million for the second quarter of 2022, compared to $4.4 million for the same period in 2021. Loss from operations was $23.4 million for the second quarter of 2022, compared to a loss from operations of $17.8 million for the same period in 2021. Chimerix’s balance sheet at June 30, 2022 included $42.8 million of capital available to fund operations and approximately 87.4 million outstanding shares of common stock. The proforma cash balance at June 30, 2022, inclusive of the revenue recognized to date from the two international TEMBEXA revenue contracts, is approximately $70 million. An additional $225 million, subject to adjustment for final terms of the agreement with BARDA, is due at the expected closing of the sale of TEMBEXA to EBS. The proceeds from these transactions are expected to provide Chimerix with substantial financial strength to execute the ACTION study as well as advance our broader pipeline. Conference Call and Webcast Chimerix will host a conference call and live audio webcast to discuss second quarter 2022 financial results and provide a business update today at 4:30 p.m. ET. To access the live conference call, please dial 646-307-1963 (domestic) or 800-715-9871 (international) at least five minutes prior to the start time and refer to conference ID 1222397. A live audio webcast of the call will also be available on the Investors section of Chimerix’s website, www.chimerix.com. An archived webcast will be available on the Chimerix website approximately two hours after the event. About Chimerix Chimerix is a biopharmaceutical company with a mission to develop medicines that meaningfully improve and extend the lives of patients facing deadly diseases. The Company’s most advanced clinical-stage development program, ONC201, is in development for H3 K27M-mutant glioma. Forward-Looking StatementsThis press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties that could cause actual results to differ materially from those projected. Forward-looking statements include those relating to, among other things, consummation of the Transaction, including, as a result of failing to satisfy the closing conditions to the Transaction; the satisfaction of any closing conditions in a timely manner or at all, including, without limitation; the execution of a procurement contract for TEMBEXA; the timing of the initiation of the Phase 3 clinical development of ONC201; and Chimerix’s financial strength. Among the factors and risks that could cause actual results to differ materially from those indicated in the forward-looking statements are risks that the Transaction will not be completed as planned; Chimerix will not obtain a procurement contract for TEMBEXA in a timely manner, on favorable terms, or at all; risks that the initial delivery or any subsequent deliveries of TEMBEXA will not occur as planned, or at all; the anticipated benefits of the acquisition of Oncoceutics may not be realized; risks that Chimerix’s reliance on a sole source third-party manufacturer for drug supply; risks that ongoing or future trials may not be successful or replicate previous trial results, or may not be predictive of real-world results or of results in subsequent trials; risks and uncertainties relating to competitive products and technological changes that may limit demand for our drugs; risks that our drugs may be precluded from commercialization by the proprietary rights of third parties; and additional risks set forth in the Company's filings with the Securities and Exchange Commission. These forward-looking statements represent the Company's judgment as of the date of this release. The Company disclaims, however, any intent or obligation to update these forward-looking statements. CONTACT:Investor Relations: Michelle LaSpaluto919 972-7115ir@chimerix.comWill O’ConnorStern Investor Relations212-362-1200will@sternir.com CHIMERIX, INC. CONSOLIDATED BALANCE SHEETS (in thousands, except share and per share data) (unaudited) June, 30 December 31, 2022 2021 ASSETS Current assets: Cash and cash equivalents $28,086 $15,397 Short-term investments, available-for-sale 14,705 72,970 Inventories 4,126 2,760 Prepaid expenses and other current assets 3,853 4,678 Total current assets 50,770 95,805 Long-term investments - 2,022 Property and equipment, net of accumulated depreciation 205 253 Operating lease right-of-use assets 2,189 2,404 Other long-term assets 399 56 Total assets $53,563 $100,540 LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable $1,743 $2,788 Accrued liabilities 16,682 12,933 Deferred Revenue 4,846 175 Note payable - 14,000 Total current liabilities 23,271 29,896 Loan Fees 250 - Lease-related obligations 2,114 2,392 Total liabilities 25,635 32,288 Stockholders’ equity: Preferred stock, $0.001 par value, 10,000,000 shares authorized at June 30, 2022 and December 31, 2021; no shares issued and outstanding as of June 30, 2022 and December 31, 2021; no shares issued and outstanding as of June 30, 2022 and - - Common stock, $0.001 par value, 200,000,000 shares authorized at June 30, 2022 and December 31, 2021; 87,436,180 and 86,884,266 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively 87 87 Additional paid-in capital 961,740 953,782 Accumulated other comprehensive loss, net (68) (21) Accumulated deficit (933,831) (885,596) Total stockholders’ equity 27,928 68,252 Total liabilities and stockholders’ equity $53,563 $100,540 CHIMERIX, INC.CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS(in thousands, except share and per share data)(unaudited) Three Months Ended June 30, Six Months Ended June 30, 2022 2021 2022 2021 Revenues: Contract and grant revenue $- $390 $- $1,823 Licensing revenue 440 1 455 3 Total revenues 440 391 455 1,826 Cost of goods sold - - 114 - Gross Profit 440 391 341 1,826 Operating expenses: Research and development 18,047 13,798 37,087 25,660 General and administrative 5,840 4,408 11,472 8,544 Acquired in-process research and dvelopment - - - 82,890 Total operating expenses 23,887 18,206 48,559 117,094 Loss from operations (23,447) (17,815) (48,218) (115,268)Other (loss) income: Interest income and other, net (21) 52 (17) 90 Net loss (23,468) (17,763) (48,235) (115,178)Other comprehensive loss: Unrealized gain (loss) on debt investments, net 5 32 (47) (11) Comprehensive loss $(23,463) $(17,731) $(48,282) $(115,189)Per share information: Net loss, basic and diluted $(0.27) $(0.21) $(0.55) $(1.38) Weighted-average shares outstanding, basic and diluted 87,436,180 86,255,836 87,263,452 83,231,600

– Received U.S. Food and Drug Administration (FDA) Approval for TEMBEXA® (brincidofovir) for the Treatment of Smallpox – – Blinded Independent Central Review (BICR) of ONC201 Registration Cohort in Recurrent H3 K27M-mutant Glioma Expected in Fourth Quarter 2021 – – Conference Call at 8:30 a.m. ET Today – DURHAM, N.C., Aug. 05, 2021 (GLOBE NEWSWIRE) -- Chimerix (NASDAQ:CMRX), a biopharmaceutical company focused on accelerating the development of medicines to treat cancer and other serious diseases, today reported financial results for the second quarter ended June 30, 2021 and provided an operational update. “We made considerable progress throughout the first half of 2021, highlighted by the acquisition of Oncoceutics, the initiation of the Phase 3 DASH AML trial, and the FDA approval of TEMBEXA as a medical countermeasure for smallpox. This approval is an important milestone as it marks Chimerix’s first FDA approved drug and is the first smallpox antiviral approved for all age groups, including infants, with an available oral solution for patients who have difficulty swallowing,” said Mike Sherman, Chief Executive Officer of Chimerix. “Looking ahead to the balance of the year, we expect to report the efficacy analysis by BICR for ONC201 and complete TEMBEXA manufacturing to support U.S. national preparedness.” Recent Highlights TEMBEXA for Smallpox In June, the FDA granted TEMBEXA tablets and oral suspension approval for the treatment of smallpox. TEMBEXA is approved for adult and pediatric patients and is the first and only smallpox therapy approved for neonates. The oral suspension formulation is particularly important for patients who have difficulty swallowing due to age or medical status. TEMBEXA potentially fills an important role as a treatment countermeasure to smallpox; it has a differentiated mechanism of action, a relatively high barrier to resistance and available evidence suggests it can be used in patients who have received the other approved smallpox antiviral treatment.   By year-end, Chimerix expects to complete initial TEMBEXA drug product manufacturing in order to satisfy a potential procurement contract to support national preparedness in the United States. Imipridones and ONC201 Chimerix’s acquisition of Oncoceutics, Inc., expands the Company’s oncology franchise with a late-stage, novel class of small molecule anti-cancer compounds. Oncoceutics’ lead product candidate, ONC201, has been shown in clinical testing to selectively induce tumor cell death in multiple cancer types. The BICR of radiographic imaging will enable clinical efficacy analyses of the first 50 patients with recurrent H3-K27M-mutant diffuse midline glioma who received single agent ONC201. These analyses will include overall response rate and key supportive endpoints, such as durability of response and other measures of clinical benefit. If favorable, these data may form the basis for an NDA submission seeking accelerated approval of ONC201 in the United States. In addition, a Phase 1 clinical trial for ONC206, our second imipridone product candidate, and IND-enabling work for our third imipridone candidate, ONC212, remain ongoing. DSTAT for AML Chimerix continues enrollment in the Phase 3 Dociparstat in AML with Standard Chemotherapy (DASH AML) study of DSTAT for the treatment of AML. The multicenter, randomized, double-blind, placebo-controlled, parallel-group study will evaluate the efficacy and safety of DSTAT in combination with standard intensive induction and consolidation chemotherapy for the treatment of newly-diagnosed AML patients. Chimerix expects to unblind data following enrollment of the first 80 evaluable patients in this study to assess complete response rates and minimal residual disease rates between the study arm and the control arm. This analysis is expected to take place in the second half of 2022. Expected 2021 Milestones Second Quarter 2021 Financial Results Chimerix reported a net loss of $17.8 million, or $0.21 per basic and diluted share, for the second quarter of 2021. During the same period in 2020, Chimerix recorded a net loss of $10.0 million, or $0.16 per basic and diluted share. Revenues for the second quarter of 2021 decreased to $0.4 million, compared to $1.4 million for the same period in 2020. Research and development expenses increased to $13.8 million for the second quarter of 2021, compared to $8.6 million for the same period in 2020. General and administrative expenses increased to $4.4 million for the second quarter of 2021, compared to $3.1 million for the same period in 2020.Chimerix's balance sheet at June 30, 2021, included approximately $140 million of capital available to fund operations, $14.0 million in a note payable related to the Oncoceutics transaction and approximately 86.2 million outstanding shares of common stock. Conference Call and Webcast Chimerix will host a conference call and live audio webcast to discuss second quarter 2021 financial results and provide a business update today at 8:30 a.m. ET. To access the live conference call, please dial 877-354-4056 (domestic) or 678-809-1043 (international) at least five minutes prior to the start time and refer to conference ID 6658827. A live audio webcast of the call will also be available on the Investors section of Chimerix’s website, . An archived webcast will be available on the Chimerix website approximately two hours after the event. About Chimerix Chimerix is a development-stage biopharmaceutical company dedicated to accelerating the advancement of innovative medicines that make a meaningful impact in the lives of patients living with cancer and other serious diseases. In June 2021, the U.S. Food and Drug Administration granted approval of TEMBEXA for the treatment of smallpox as a medical countermeasure. The Company has two other advanced clinical-stage development programs, ONC201 and dociparstat sodium (DSTAT). ONC201 is currently in a registrational clinical program for recurrent H3 K27M-mutant glioma and an efficacy analysis by blinded independent central review is expected later in 2021. DSTAT is in development as a potential first-line therapy in acute myeloid leukemia. About TEMBEXA TEMBEXA is an oral antiviral formulated as 100 mg tablets and 10 mg/mL oral suspension dosed once weekly for two weeks. TEMBEXA is indicated for the treatment of human smallpox disease caused by variola virus in adult and pediatric patients, including neonates. TEMBEXA is not indicated for the treatment of diseases other than human smallpox disease. The effectiveness of TEMBEXA for the treatment of smallpox disease has not been determined in humans because adequate and well-controlled field trials have not been feasible and inducing smallpox disease in humans to study the drug’s efficacy is not ethical. TEMBEXA efficacy may be reduced in immunocompromised patients based on studies in immune deficient animals. TEMBEXA (brincidofovir) is a nucleotide analog lipid-conjugate designed to mimic a natural monoacyl phospholipid to achieve effective intracellular concentrations of the active antiviral metabolite, cidofovir diphosphate. Cidofovir diphosphate exerts its orthopoxvirus antiviral effects by acting as an alternate substrate inhibitor for viral DNA synthesis mediated by viral DNA polymerase. IMPORTANT SAFETY INFORMATION Including BOXED WARNING WARNINGS AND PRECAUTIONS Elevations in Hepatic Transaminases and Bilirubin: May cause increases in serum transaminases (ALT or AST) and serum bilirubin. Monitor liver laboratory parameters before and during treatment. Diarrhea and Other Gastrointestinal Adverse Events: Diarrhea and additional gastrointestinal adverse events including nausea, vomiting, and abdominal pain may occur. Monitor patients, provide supportive care, and if necessary, do not give the second and final dose of TEMBEXA. Coadministration with Related Products: TEMBEXA should not be co-administered with intravenous cidofovir. Carcinogenicity: TEMBEXA is considered a potential human carcinogen. Do not crush or divide TEMBEXA tablets and avoid direct contact with broken or crushed tablets or oral suspension. Male Infertility: Based on testicular toxicity in animal studies, TEMBEXA may irreversibly impair fertility in individuals of reproductive potential. ADVERSE REACTIONS Common adverse reactions (adverse events assessed as causally related by the investigator in ≥ 2% of subjects) experienced in the first 2 weeks of dosing with TEMBEXA were diarrhea, nausea, vomiting and abdominal pain. USE IN SPECIFIC POPULATIONS Pregnancy Based on findings from animal reproduction studies, TEMBEXA may cause fetal harm when administered to pregnant individuals. Pregnancy testing should be performed before initiation of TEMBEXA in individuals of childbearing potential to inform risk. An alternative therapy should be used to treat smallpox during pregnancy, if feasible. Forward-Looking StatementsThis press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 that are subject to risks and uncertainties that could cause actual results to differ materially from those projected. Forward-looking statements include those relating to, among other things, the status of Chimerix’s oncology programs, and the potential benefits and government procurement of TEMBEXA. Among the factors and risks that could cause actual results to differ materially from those indicated in the forward-looking statements are risks that the current clinical study data for ONC201 will not support accelerated, or any, regulatory approval; the anticipated benefits of the acquisition of Oncoceutics may not be realized; the ability to generate positive results in a Phase 3 study in acute myeloid leukemia and subsequent approval for DSTAT; risks that Chimerix will not obtain a procurement contract for TEMBEXA in smallpox in a timely manner or at all; Chimerix’s reliance on a sole source third-party manufacturer for drug supply; risks that ongoing or future trials may not be successful or replicate previous trial results, or may not be predictive of real-world results or of results in subsequent trials; risks and uncertainties relating to competitive products and technological changes that may limit demand for our drugs; risks that our drugs may be precluded from commercialization by the proprietary rights of third parties; and additional risks set forth in the Company's filings with the Securities and Exchange Commission. These forward-looking statements represent the Company's judgment as of the date of this release. The Company disclaims, however, any intent or obligation to update these forward-looking statements. CONTACT:Investor Relations:        Michelle LaSpaluto919 972-7115ir@chimerix.comWill O’ConnorStern Investor Relations212-362-1200will@sternir.com