Atezolizumab

21 months median OS in amezalpat arm vs. 15 in control arm 50% (20/40) of patients on amezalpat arm remain in survival follow up 0.65 hazard ratio, maintained since 0.59 observed in primary analysis 10 months earlier Early and persistent separation of survival curves OS is the primary regulatory endpoint for first-line HCCCompany to host webcast conference call today at 8:30am ET BRISBANE, Calif., June 20, 2024 (GLOBE NEWSWIRE) -- Tempest Therapeutics, Inc. (Nasdaq: TPST), a clinical-stage oncology company developing first-in-class1 therapeutics that combine both targeted and immune-mediated mechanisms, today announced new positive data from the ongoing global randomized Phase 1b/2 clinical study in which amezalpat2 (TPST-1120), Tempest’s PPAR⍺ antagonist, delivered a six-month improvement in median overall survival (“OS”) advantage when combined with atezolizumab and bevacizumab in a comparison to atezolizumab and bevacizumab alone in the first-line treatment of patients with unresectable or metastatic hepatocellular carcinoma (“HCC”). “We are thrilled by these new survival data that build on the already meaningful data released in the fall showing the improvement of the amezalpat arm over atezolizumab and bevacizumab control across all study endpoints,” said Stephen Brady, president and chief executive officer of Tempest. “These new data come after 10 more months of follow-up since the last data analysis and show not only a strong hazard ratio of 0.65 favoring the amezalpat arm, but also a six-month improvement in the median overall survival with half the patients still in survival follow up, as well as observation of a survival advantage across key populations – results that we believe put amezalpat in a strong position for a successful pivotal Phase 3.” At the cutoff date of February 14, 2024, the new data from 40 patients randomized to the amezalpat arm and 30 patients randomized to the control arm show: 21 month median OS for the amezalpat arm versus 15 month for the control arm, a six-month survival advantage20/40 patients remain in survival follow up in the amezalpat arm, compared to 9/30 patients in the control arm0.65 hazard ratio (“HR”) for OS, revealing a stable HR since the top-line analysis 10 months earlier when the HR was 0.59Manageable safety profile consistent with Phase 1 data The earlier top-line data analysis, dated April 20, 2023, had a median follow up of 9.2 and 9.9 months for the amezalpat and control arms, respectively, and showed: Confirmed objective response rate (“cORR” or “confirmed ORR”) of 30% for the amezalpat arm versus 13.3% for the control arm;Biomarker subpopulation findings were consistent with the mechanism of action of amezalpat Patients with b-catenin activating mutations (21% in this study (n=7)) showed a cORR of 43% and a disease control rate (“DCR”) of 100% in the amezalpat armThe amezalpat arm was consistently active across both PD-L1 positive and PD-L1 negative tumors, with a cORR of 27% in the amezalpat arm compared to 7% for the control arm in PD-L1 negative tumors Amezalpat remains well tolerated, with safety data comparable between the two armsThe randomized arms were generally well balanced at baseline ORR was determined by RECIST v1.1, and confirmed responses included at least two scans. Tempest retains all product rights to amezalpat. Conference Call & Webcast Information Tempest will host a webcast conference call today, June 20, 2024 at 8:30am ET. To join the conference call via phone and participate in the live Q&A session, please pre-register online here to receive a telephone number and unique passcode required to enter the call. The live webcast and audio archive of the presentation may be accessed on the investor section of the Tempest website at https://ir.tempesttx.com/. The webcast will be available for replay for 30 days. About the Randomized Clinical Trial The Phase 1b/2 global randomized HCC study is part of Roche’s Morpheus program and evaluates amezalpat in combination with atezolizumab and bevacizumab versus atezolizumab and bevacizumab, the standard of care, in patients with unresectable or metastatic HCC not previously treated with systemic therapy. The trial randomized 70 patients to receive either amezalpat with atezolizumab + bevacizumab or a contemporaneous control arm of atezolizumab + bevacizumab alone at approximately 25 sites worldwide, including in the United States, Europe, and Asia. The primary efficacy endpoint was confirmed objective response rate, and key secondary endpoints including PFS and OS. Under the terms of the clinical collaboration agreement, Roche is managing the study operations for this global, multicenter trial and Tempest retains all product rights. About Amezalpat (TPST-1120) Amezalpat is an oral, small molecule, selective PPAR⍺ antagonist. Tempest’s data suggest that amezalpat treats cancer by targeting tumor cells directly and by modulating immune suppressive cells and angiogenesis in the tumor microenvironment. In an ongoing global randomized phase 1b/2 study of amezalpat in combination with atezolizumab and bevacizumab in first-line patients with advanced HCC, the amezalpat arm showed clinical superiority across multiple study endpoints when compared to atezolizumab and bevacizumab alone, the standard of care. These randomized data were supported by positive results observed in the Phase 1 clinical trial in patients with heavily pretreated advanced solid tumors. About Hepatocellular Carcinoma HCC is an aggressive cancer with rising mortality and is projected to become the third leading cause of cancer death by 2030.3 Every year, more than 900,000 people worldwide are diagnosed with HCC.4 Incidence and mortality are highest in East Asia and are increasing in parts of Europe and the US.5 In the US, HCC represents the fastest-rising cause of cancer-related death.3 Nine out of ten cases of HCC are caused by chronic liver disease, which includes chronic hepatitis B and C infection, non-alcoholic fatty liver disease (NAFLD), non-alcoholic steatohepatitis (NASH), alcohol-related liver disease (ALD) and cirrhosis resulting from these conditions.6 Even if diagnosed in the early stage, an estimated 70-80% of people with early-stage HCC experience disease recurrence following surgery.7 Early recurrence is associated with poorer prognosis and shorter survival.5,8 Tumor size, number of tumors, and portal vein invasion are associated with an increased risk of recurrence.6 About Tempest Therapeutics Tempest Therapeutics is a clinical-stage biotechnology company advancing a diverse portfolio of small molecule product candidates containing tumor-targeted and/or immune-mediated mechanisms with the potential to treat a wide range of tumors. The company’s novel programs range from early research to later-stage investigation in a randomized global study in first-line cancer patients. Tempest is headquartered in Brisbane, California. More information about Tempest can be found on the company’s website at www.tempesttx.com. Forward-Looking Statements This press release contains forward-looking statements (including within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) concerning Tempest Therapeutics, Inc. (“Tempest Therapeutics”). These statements may discuss goals, intentions, and expectations as to future plans, trends, events, results of operations or financial condition, or otherwise, based on current beliefs of the management of Tempest Therapeutics, as well as assumptions made by, and information currently available to, management of Tempest Therapeutics. Forward-looking statements generally include statements that are predictive in nature and depend upon or refer to future events or conditions, and include words such as “may,” “will,” “should,” “would,” “could”, “expect,” “anticipate,” “plan,” “likely,” “believe,” “estimate,” “project,” “intend,” and other similar expressions. All statements that are not historical facts are forward-looking statements, including any statements in this release regarding the therapeutic benefit and regulatory development of amezalpat and the favorable results of clinical trials. Forward-looking statements are based on information available to Tempest Therapeutics as of the date hereof and are not guarantees of future performance. Actual results could differ materially from those contained in any forward-looking statement. These and other risks are described in greater detail in the Form 10-Q filed by Tempest Therapeutics with the Securities and Exchange Commission on May 9, 2024. Except as required by applicable law, Tempest Therapeutics undertakes no obligation to revise or update any forward-looking statement, or to make any other forward-looking statements, whether as a result of new information, future events or otherwise. These forward-looking statements should not be relied upon as representing Tempest Therapeutics’ views as of any date subsequent to the date of this press release and should not be relied upon as prediction of future events. In light of the foregoing, investors are urged not to rely on any forward-looking statement in reaching any conclusion or making any investment decision about any securities of Tempest Therapeutics. Investor Contacts: Sylvia WheelerWheelhouse Life Science Advisorsswheeler@wheelhouselsa.com Aljanae Reynolds Wheelhouse Life Science Advisorsareynolds@wheelhouselsa.com 1 If approved by the FDA2 Recommended International Nonproprietary Name (INN), April 22, 20243 Rahib, L. et al. Projecting cancer incidence and deaths to 2030: the unexpected burden of thyroid, liver, and pancreas cancers in the United States. Cancer Res. 74, 2913-2921 (2014).4 World Health Organization. Liver Cancer Factsheet. Globocan. 2020. Available at: https://gco.iarc.fr/today/data/factsheets/cancers/11-Liver-fact-sheet.pdf. Last accessed: April 2023.5 Llovet, J. M., Kelley, R. K., Villanueva, A., et al. Hepatocellular carcinoma. Nature Reviews Disease Primers. 2021, 7(1), 6.6 Office for Health Improvement & Disparities. Liver disease profiles: November 2021 update. Available at: https://www.gov.uk/government/statistics/liver-disease-profiles-november-2021-update/liver-disease-profiles-november-2021-update. Last accessed: April 2023.7 Hack SP, Spahn J, Chen M et al. IMbrave 050: a Phase III trial of atezolizumab plus bevacizumab in high-risk hepatocellular carcinoma after curative resection or ablation. Future Oncology. 2020 May;16(15):975-989.8 Saito A, Toyoda H, Kobayashi M et al. Prediction of early recurrence of hepatocellular carcinoma after resection using digital pathology images assessed by machine learning. Modern Pathology. 2021. 34, 417-425.

Demonstrating pelareorep's synergy with modified FOLFIRINOX +/- atezolizumab in pancreatic cancer could expand the number of patients it may benefit Funding for the study comes from the US$5 million Therapeutic Accelerator Award from PanCAN SAN DIEGO, and CALGARY, AB, June 20, 2024 /PRNewswire/ -- Oncolytics Biotech® Inc. (NASDAQ: ONCY) (TSX: ONC), a leading clinical-stage company specializing in immunotherapeutics for oncology, announced the dosing of the first patient in the new GOBLET study cohort evaluating pelareorep and modified FOLFIRINOX (mFOLFIRINOX) with or without atezolizumab (Tecentriq®) in newly diagnosed metastatic pancreatic ductal adenocarcinoma (PDAC) patients. The co-primary endpoints of the cohort are objective response rate (ORR) and safety. It is supported by the US$5M Pancreatic Cancer Action Network (PanCAN) Therapeutic Accelerator Award, an innovative program established to accelerate the development of new treatments for pancreatic cancer patients. It will be conducted in collaboration with AIO-Studien-gGmbH (AIO), a clinical trial group within the German Cancer Society, as part of GOBLET, a Phase 1/2 multiple indication study evaluating pelareorep-based combinations in gastrointestinal cancers. "Initiation of dosing in the mFOLFIRINOX cohort of the GOBLET study is an important milestone for Oncolytics, and we're excited to begin evaluating another pelareorep combination therapy that could result in a second pancreatic cancer registration program for the company," said Thomas Heineman, M.D., Ph.D., Chief Medical Officer at Oncolytics. "The combination of pelareorep, atezolizumab, gemcitabine, and nab-paclitaxel in pancreatic cancer patients more than doubled tumor response rates compared to earlier trials of chemotherapy alone. That combination received Fast Track Designation from the FDA and is expected to be evaluated in an adaptive registration-enabling trial through the Global Coalition for Adaptive Research (GCAR). If the combination of pelareorep and mFOLFIRINOX also demonstrates a promising efficacy signal, we could have two pancreatic cancer treatment regimens on the path to registration. I want to highlight PanCAN's important support for this program with gratitude. The US$5M Therapeutic Accelerator Award has made it possible for us to broaden our evaluation of potential therapies that have the potential to improve outcomes for pancreatic cancer patients." Anna Berkenblit, MD, MMSc, Chief Scientific and Medical Officer at PanCAN said, "Working toward our vision to create a world in which all patients with pancreatic cancer will thrive, PanCAN launched the Therapeutic Accelerator Award to speed the drug development process and bring new options to patients faster. Dosing the first patient in this new cohort of the GOBLET study is an important step toward further evaluation of this investigational immunotherapeutic approach." Dirk Arnold, M.D., Ph.D., Director of Asklepios Tumorzentrum Hamburg and primary investigator of the GOBLET trial commented, "I have been pleased to observe the strength of the clinical response data for pelareorep in multiple cohorts of the GOBLET gastrointestinal study, especially in pancreatic and anal cancer. mFOLFIRINOX is currently considered the best treatment option for many pancreatic cancer patients. Therefore, the evaluation of pelareorep and mFOLFIRINOX, with or without atezolizumab, presents an important opportunity to identify a novel therapeutic approach that may broaden the population of metastatic pancreatic cancer patients who could benefit from pelareorep-based therapies." "Oncolytics is in a favorable position as we prepare to advance multiple pelareorep programs toward registration track studies and continue to expand pelareorep's potential as a backbone immunotherapy that can impact various tumor types. The collaboration with GCAR on a registration-enabling study for the combination of pelareorep, atezolizumab, gemcitabine, and nab-paclitaxel in pancreatic cancer, meeting with the FDA to align on next steps for our breast cancer program, expanded enrollment in the GOBLET anal cancer cohort, and now the initiation of dosing in the mFOLFIRINOX cohort of GOBLET, announced today, are all important elements of our corporate plan," said Dr. Matt Coffey, President and Chief Executive Officer of Oncolytics. "The ability to improve the lives of cancer patients is something that motivates everyone at Oncolytics, and beginning to treat pancreatic cancer patients in the mFOLFIRINOX cohort of GOBLET is hopefully yet another step towards that goal." About GOBLET cohort 5 The mFOLFIRINOX cohort of the Phase 1/2 GOBLET study is designed to evaluate newly diagnosed PDAC patients treated with pelareorep + mFOLFIRINOX with or without atezolizumab. There will be a three-patient safety run-in to evaluate the tolerability of each treatment arm: pelareorep + mFOLFIRINOX + atezolizumab and pelareorep + mFOLFIRINOX. A total of fifteen evaluable patients will be randomized to each arm in Stage 1 of this Simon two-stage study. The co-primary endpoints are objective response rate and safety. If Stage 1 success criteria are met, one or both treatment arms may be expanded to Stage 2 in which 17 additional evaluable patients per arm will be enrolled. Blood and tumor samples will also be collected for translational evaluations. About GOBLET The GOBLET ( Gastrointestinal tum Ors exploring the treatment com Binations with the oncolytic reovirus pe Lar Eorep and an Ti-PD-L1) study is a phase 1/2 multiple indication study in advanced or metastatic gastrointestinal tumors. The study is being conducted at 17 centers in Germany and is being managed by AIO-Studien-gGmbH. The co-primary endpoints of the study are objective response rate (ORR) and/or disease control rate assessed at week 16 and safety. Key secondary and exploratory endpoints include additional efficacy assessments and evaluation of potential biomarkers. The study comprises five treatment groups: Pelareorep in combination with atezolizumab, gemcitabine, and nab-paclitaxel in 1st line advanced/metastatic pancreatic cancer patients; Pelareorep in combination with atezolizumab in 1st line MSI (microsatellite instability)-high metastatic colorectal cancer patients; Pelareorep in combination with atezolizumab and TAS-102 in 3rd line metastatic colorectal cancer patients Pelareorep in combination with atezolizumab in 2nd line advanced and unresectable anal cancer patients; and Pelareorep in combination with mFOLFIRINOX with and without atezolizumab in newly diagnosed metastatic PDAC patients. Any cohort meeting pre-specified efficacy criteria in Stage 1 may be advanced to Stage 2 and enroll additional patients. About AIO AIO-Studien-gGmbH (AIO) emerged from the study center of the medical oncology working group within the German Cancer Society (DKG). AIO operates with a non-profit purpose of promoting science and research with a focus on medical oncology. Since its foundation, AIO has become a successful sponsor and study management company and has established itself both nationally and internationally. About Oncolytics Biotech Inc. Oncolytics is a clinical-stage biotechnology company developing pelareorep, an intravenously delivered immunotherapeutic agent. Pelareorep has demonstrated promising results in two randomized Phase 2 studies in metastatic breast cancer and Phase 1 and 2 studies in pancreatic cancer. It acts by inducing anti-cancer immune responses and promotes an inflamed tumor phenotype -- turning "cold" tumors "hot" -- through innate and adaptive immune responses to treat a variety of cancers. Pelareorep has demonstrated synergies with multiple approved oncology treatments. Oncolytics is currently conducting and planning combination clinical trials with pelareorep in solid and hematological malignancies as it advances towards registrational studies in metastatic breast cancer and pancreatic cancer, both of which have received Fast Track designation from the FDA. For further information, please visit: or follow the company on social media on LinkedIn and on X @oncolytics. This press release contains forward-looking statements, within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended and forward-looking information under applicable Canadian securities laws (such forward-looking statements and forward-looking information are collectively referred to herein as "forward-looking statements"). Forward-looking statements contained in this press release include Oncolytics' belief as to the potential, mechanism of action and benefits of pelareorep as a cancer therapeutic; the design, intent and potential benefits of the mFOLFIRINOX cohort of the GOBLET study; our belief that if the combination of pelareorep and mFOLFIRINOX also demonstrates a promising efficacy signal, the Company could have two pancreatic cancer treatment regimens on the path to registration; our corporate plan; the potential for expansion to Stage 2 if Stage 1 success criteria are met; our plans to advance towards registrational studies in metastatic breast cancer and pancreatic cancer; and other statements related to anticipated developments in Oncolytics' business and technologies. In any forward-looking statement in which Oncolytics expresses an expectation or belief as to future results, such expectations or beliefs are expressed in good faith and are believed to have a reasonable basis, but there can be no assurance that the statement or expectation or belief will be achieved. Such forward-looking statements involve known and unknown risks and uncertainties, which could cause Oncolytics' actual results to differ materially from those in the forward-looking statements. Such risks and uncertainties include, among others, the availability of funds and resources to pursue research and development projects, the efficacy of pelareorep as a cancer treatment, the success and timely completion of clinical studies and trials, Oncolytics' ability to successfully commercialize pelareorep, uncertainties related to the research and development of pharmaceuticals, uncertainties related to the regulatory process and general changes to the economic environment. In particular, we may be impacted by business interruptions resulting from COVID-19 coronavirus, including operating, manufacturing supply chain, clinical trial and project development delays and disruptions, labour shortages, travel and shipping disruption, and shutdowns (including as a result of government regulation and prevention measures). We may incur expenses or delays relating to such events outside of our control, which could have a material adverse impact on our business, operating results and financial condition. Investors should consult Oncolytics' quarterly and annual filings with the Canadian and U.S. securities commissions for additional information on risks and uncertainties relating to the forward-looking statements. Investors are cautioned against placing undue reliance on forward-looking statements. The Company does not undertake any obligation to update these forward-looking statements, except as required by applicable laws. SOURCE Oncolytics Biotech® Inc.