Transposition of Great Vessels

Dordaviprone (ONC201) ACTION Study Progressing; Reiterates Expectations for Interim Overall Survival (OS) Data in 2025 and Final OS Data in 2026 No Dose Limiting Toxicity in ONC206 Phase 1 Studies to Date, Preliminary Phase 1 Safety and Pharmacokinetic (PK) Data Expected This Summer Company to Advance Dordaviprone in Provisional Registration Process Following Positive Interaction with Therapeutic Goods Administration (TGA) in Australia Conference Call at 8:30 a.m. ET Today DURHAM, N.C., May 01, 2024 (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 first quarter ended March 31, 2024 and provided an operational update. “Patients, caregivers and physicians are in desperate need for novel therapies that offer clinical benefit in H3 K27M-mutant diffuse glioma, and we believe that dordaviprone (ONC201) has the potential to be a major therapeutic advance in the treatment of this disease,” said Mike Andriole, Chief Executive Officer of Chimerix. “We remain intensely focused on completion of the ACTION study and will continue to be active and collaborative with regulators to bring dordaviprone to patients in need as soon as possible. In parallel, we are continuously evaluating options to accelerate access to dordaviprone in select markets where accelerated regulatory pathways exist as there are few treatment options for this ultra-rare disease beyond radiation therapy. As an example, our recent interaction with the Therapeutic Goods Administration (TGA) in Australia is a positive initial step that is aligned to this overall strategy. Having a pivotal Phase 3 study well underway is an important consideration in global regulatory conversations that contemplate accelerated approval, and the ongoing maturation of the ACTION study enables these conversations,” added Mr. Andriole. “Furthermore, we continue to progress our second generation imipridone, ONC206, in Phase 1 dose escalation and are enthusiastic about the differentiated pro activity seen with this molecule thus far. We expect to pursue novel development opportunities apart from dordaviprone and look forward to describing the future development path of ONC206 by the end of the year,” concluded Mr. Andriole. Dordaviprone (ONC201) Dordaviprone is an oral, first-in-class small molecule imipridone that selectively binds to the G-protein coupled dopamine receptor D2 (DRD2) and the mitochondrial protease ClpP. Dordaviprone is being evaluated in the Phase 3 ACTION trial that is currently enrolling H3 K27M-mutant glioma patients at over 135 sites in 13 countries. The trial enrolls patients shortly after completion of front-line radiation therapy, that is the standard of care. The study is designed to enroll 450 patients randomized 1:1:1 to receive dordaviprone at one of two dosing frequencies or placebo. Participants are randomized to receive 625mg of dordaviprone once per week (the Phase 2 dosing regimen), 625mg on two consecutive days per week or placebo. The dose is scaled by body weight for patients <52.5kg. Chimerix expects interim overall survival (OS) data in 2025 and final OS data in 2026. For more information, please visit clinicaltrials.gov Chimerix recently engaged in the process to evaluate eligibility for dordaviprone to be considered for Provisional Registration in Australia. The Provisional Registration process is a three-step process which begins with a Pre-Submission Meeting evaluating current data, as well as other program features, including the status of pivotal studies. Chimerix recently completed the Pre-Submission Meeting with the TGA and the TGA agreed that dordaviprone meets the criteria to advance to the second of three steps in the process, a Provisional Determination application. The meeting included an assessment that preliminary data is likely to provide a “major therapeutic advance” in H3 K27M-mutant glioma and that the ACTION study could provide pivotal confirmatory safety and efficacy data before the conclusion of the Provisional Registration period. Chimerix expects to work collaboratively with TGA as dordaviprone advances to the next step in the process over the coming months. Once submitted, the Provisional Determination review process is targeted for 20 working days. Should an application for Provisional Registration be submitted the review process is 255 working days. We expect a filing could occur around year end with possible commercial availability in 2026. ONC206 ONC206 is a second generation ClpP agonist and DRD2 antagonist that has demonstrated monotherapy anti-cancer activity in pre-clinical models in primary CNS tumors and solid tumors outside of the CNS. Phase I dose escalation trials continue at the National Institutes of Health (NIH) and the Pacific Pediatric Neuro-Oncology Consortium (PNOC) in adult and pediatric CNS tumor patients, respectively. The dose escalation trials are currently dosing at a twice per day, three days per week schedule, which are expected to increase the duration of therapeutic exposure. To date, ONC206 has been generally well tolerated with no dose limiting toxicities as is currently being dosed in the expected therapeutic range. Chimerix expects to report preliminary safety and pharmacokinetic (PK) data from these studies beginning in mid-2024. Corporate In March 2024, Chimerix announced the appointment of Marc D. Kozin as the newest member of the Company’s Board of Directors. Mr. Kozin brings more than 35 years of experience in corporate and business strategy consulting and merger and acquisition advisory services. In addition, Patrick Machado has announced his retirement from the Chimerix Board effective at the Company’s 2024 Annual Meeting of Stockholders in June, after ten years of service. First Quarter 2024 Financial Results Chimerix reported a net loss of $21.9 million, or $0.25 per basic and diluted share, for the first quarter of 2024. During the same period in 2023, Chimerix recorded a net loss of $21.4 million, or $0.24 per basic and diluted share. Research and development expenses were $18.8 million for the first quarter of 2024 and the same period in 2023. General and administrative expenses decreased to $5.5 million for the first quarter of 2024, compared to $5.7 million for the same period in 2023. Chimerix's balance sheet at March 31, 2024 included $188.2 million of capital available to fund operations, approximately 89.6 million outstanding shares of common stock and no outstanding debt. Conference Call and Webcast Chimerix will host a conference call and live audio webcast to discuss first quarter 2024 financial results and provide a business update today at 8:30 a.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 1246220. 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 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 Statements This 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, applications for Provisional Determination and Provisional Determination in Australia, plans for accelerated approval from other global regulators, completion of the ACTION study, and the characteristics and development of ONC206. Among the factors and risks that could cause actual results to differ materially from those indicated in the forward-looking statements are risks related to the ability to obtain and maintain accelerated approval; risks related to the timing, completion and outcome of the Phase 3 ACTION study of ONC201; risks associated with repeating positive results obtained in prior preclinical or clinical studies in future studies; risks related to the clinical development of ONC206; 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: Will O’Connor Stern Investor Relations 212-362-1200 will@sternir.com CHIMERIX, INC. CONSOLIDATED BALANCE SHEETS (in thousands, except share and per share data) (unaudited) March 31, December 31, 2024 2023 ASSETS Current assets: Cash and cash equivalents $ 19,026 $ 27,661 Short-term investments, available-for-sale 140,002 155,174 Accounts receivable 1 4 Prepaid expenses and other current assets 4,003 6,271 Total current assets 163,032 189,110 Long-term investments 29,133 21,657 Property and equipment, net of accumulated depreciation 263 224 Operating lease right-of-use assets 1,354 1,482 Other long-term assets 260 301 Total assets $ 194,042 $ 212,774 LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities: Accounts payable $ 3,823 $ 2,851 Accrued liabilities 15,112 15,592 Total current liabilities 18,935 18,443 Line of credit commitment fee - 125 Lease-related obligations 1,005 1,177 Total liabilities 19,940 19,745 Stockholders’ equity: Preferred stock, $0.001 par value, 10,000,000 shares authorized at March 31, 2024 and December 31, 2023; no shares issued and outstanding as of March 31, 2024 and December 31, 2023; no shares issued and outstanding as of March 31, 2024 and - - Common stock, $0.001 par value, 200,000,000 shares authorized at March 31, 2024 and December 31, 2023; 89,629,902 and 88,929,300 shares issued and outstanding as of March 31, 2024 and December 31, 2023, respectively 90 89 Additional paid-in capital 991,583 988,457 Accumulated other comprehensive (gain) loss, net (178 ) 7 Accumulated deficit (817,393 ) (795,524 ) Total stockholders’ equity 174,102 193,029 Total liabilities and stockholders’ equity $ 194,042 $ 212,774 CHIMERIX, INC. CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (in thousands, except share and per share data) (unaudited) Three Months Ended March 31, 2024 2023 Revenues: Contract and grant revenue $ - $ 234 Licensing revenue - 49 Total revenues - 283 Operating expenses: Research and development 18,844 18,822 General and administrative 5,546 5,679 Total operating expenses 24,390 24,501 Loss from operations (24,390 ) (24,218 ) Other income: Interest income and other, net 2,521 2,846 Net loss (21,869 ) (21,372 ) Other comprehensive (loss) income: Unrealized (loss) gain on debt investments, net (185 ) 106 Comprehensive loss $ (22,054 ) $ (21,266 ) Per share information: Net loss, basic and diluted $ (0.25 ) $ (0.24 ) Weighted-average shares outstanding, basic and diluted 89,259,106 88,294,624

Peca Labs , a medical device company making vascular grafts and valves with durable polymeric cardiovascular devices designed to fit, grow, and last in pediatric populations, recently announced its first successful in-human implant of the Masa valve. The valve is intended to be used to reconstruct the right ventricular outflow tract (RVOT) and provide a functional pulmonary valve in patients up to age 22. Once implanted, Masa provides a pathway for blood from the right ventricle to the pulmonary arteries, using its design to help prevent backflow into the right ventricle. The valve is a bi-leaflet pulmonary valved conduit . It has an expanded polytetrafluoroethylene (ePTFE) conduit and ePTFE leaflets fixtured to the conduit with polypropylene suture. The device includes a pad-printed design on the outer surface to indicate valve position and direction of flow. Image courtesy of Peca Labs Peca has received Humanitarian Use Device (HUD) and Investigational Device Exemption (IDE) designation from FDA and has begun enrollment for its Masa Valve Early Feasibility Clinical Study at four clinical sites in the United States. One of the study sites included is Children’s Hospital of Philadelphia, which is where the successful first in-human implant recently took place. The valve was reportedly implanted in a 21-month-old child who had previously undergone surgery for a homograft at one year old. The homograft, also known as a human tissue valve, had become severely stenotic and required immediate replacement. In turn, the homograft has been replaced with a 14mm Masa valve and the patient has shown encouraging early results post-procedure, with promising valve functionality on early assessment, according to the company. "This successful implant marks a historic step for our polymeric valve technology that aims to combine the bio-inert benefits of organic tissue and durability of mechanical valves to potentially reduce the need for additional surgeries. The Masa valve materials and design may also help to preserve native tissue that would otherwise be used for a part of the reconstruction and could reduce the amount of medication needed for the patient during their lifetime," Arush Kalra, chief scientific officer and co-founder at Peca Labs, wrote in a statement for MD+DI . "This case brings Masa valve one step closer to being available to children who need such transformational innovation the most, furthering Peca's goal to save and improve lives." Other existing valve implants are made with metal, ceramic or bioprosthetic materials, which can “cause biological responses, lack customizability, cannot be grown, and are destined to fail within five to 10 years,” according to a press release announcing the in-human implant. “Failed conduits require repeat surgeries and interventions, costing more than $100,000 per patient on average, and current interventions for failed implants don’t resolve the core reason for failure.” The Masa valve is named after its inventor, Masahiro Yoshida, MD, PhD , who created the concept after observing issues using biologic valve replacements including calcification, limitations of valve expansion on a growing heart, and shorter times between surgical replacements. Pediatric patients born with valve defects related to a number of congenital heart conditions — pulmonary stenosis, tetralogy of fallot, truncus arteriosus, transposition of great vessels, and pulmonary atresia — require multiple open-heart surgeries from childhood to adulthood. Especially in very young patients, implanted valves and conduits need to be replaced with larger ones as the heart grows. Yoshida, in turn, designed a PTFE implant that was more adaptable to a growing heart, reduced the issues of calcification, and expanded the intervals between replacements. It was years later that three Carnegie Mellon University students formed Peca as a startup near Pittsburgh to commercialize a product based on Dr. Yoshida’s concepts, creating the Masa valve. The company developed the valve to be made entirely out of polymeric materials to help avoid some of the complications that come with the use of biologic valves. Masa does not use biologic or foreign tissue, meaning that the body will not have any immune response to the device. Additionally, its polymeric material helps avoid valve calcification and can be produced in an array of sizes to match each patient’s anatomy. “In designing the Masa valve, we aimed to use our polymer platform to combine the best characteristics of homograft tissue, which reduces the antithrombotic therapy required, and mechanical valves, which offer improved durability, supply availability, and resistance to both calcification and shrinkage,” said Doug Bernstein, CEO at Peca Labs. “We then improved upon them with a novel bi-leaflet design.” Now embarking on the enrollment stage of its clinical study, the company is slated to enroll 10 to 15 patients at up to five sites. The study, which is multi-center, non-randomized, prospective, and interventional, is set to determine the safety and probable benefit of Masa by following implanted subjects for a total of five years post-procedure with a post-op, 30-day, 180-day, and one year follow-up, followed by an annual follow up until five years.