Oncolytics Biotech® Reports Second Quarter Financial Results and Details Clinical Program Plans for Pelareorep

Key opinion leader event and pancreatic cancer clinical data validate decision to engage with regulators on plans for a registration-enabling study

New members of the management team bring expertise in progressing clinical programs and executing successful biotech transactions

Translational data further elucidate pelareorep's mechanism of action and ability to prime the tumor microenvironment for treatment

Commitment to limiting dilution evidenced by termination of At-the-Market and Equity Line of Credit facilities

SAN DIEGO,Aug. 8, 2025/PRNewswire/ -- Oncolytics Biotech®Inc. (NASDAQ:ONCY) (TSX: ONC) ("Oncolytics" or the "Company"), a clinical-stage immunotherapy company developing pelareorep, today reported financial results and recent highlights for the second quarter of 2025. All dollar amounts are expressed in Canadian currency unless otherwise noted.

"We have turned the corner from proof-of-concept studies and will be sprinting toward regulatory clarity for the remainder of the year," saidJared Kelly, Chief Executive Officer of Oncolytics. "As we shore up our intellectual property, get a clear registration path for pelareorep, and allow our GOBLET data to mature, we will establish our position as the only platform immunotherapy in gastrointestinal tumors."

Second Quarter and Subsequent Highlights

Poster presentation at the American Society of Clinical Oncology Annual Meeting features translational data further demonstrating pelareorep's mechanism of action. Additional analyses of the combination of pelareorep, gemcitabine, nab-paclitaxel, and atezolizumab in first-line ("1L") metastatic pancreatic ductal adenocarcinoma ("mPDAC") patients enhance the understanding of pelareorep's ability to stimulate the immune system and enable treatment regimens to be effective in a traditionally hostile tumor microenvironment (click here for the PR,click here for the poster). Pelareorep expands reovirus-specific T cells, increases cytokines and chemokines, and increases tumor-infiltrating lymphocytes ("TILs") in the blood.

New Chief Executive OfficerJared Kellyand Chief Business OfficerAndrew Aromandohired to optimize pelareorep's development path. Both are experienced biotech executives with decades of experience advising companies, advancing clinical programs, and navigating successful transactions. They were both instrumental in guiding the sale of Ambrx Biopharma to Johnson & Johnson.

Analyses of clinical data show pelareorep's ability to improve survival, and translational data confirming how the intended benefits are achieved. Recently highlighted survival data in mPDAC and breast cancer point to meaningful survival benefits for patients treated with pelareorep-based regimens compared to either control arms or historical data (click here for the PR). In 1L mPDAC, a review of landmark studies shows a historical benchmark of 9.2% two-year survival for chemotherapy regimens, in contrast to the 21.9% two-year survival rate recorded for 100 patients receiving pelareorep and chemotherapy. Translational data from multiple studies and tumor types provide evidence as to how these impressive results have been achieved (click here for the PR). In the GOBLET and AWARE-1 studies, pelareorep converted immunologically "cold" tumors to "hot" ones as a result of the upregulation of interferons, CXCL9/10/11, and PD-L1 in addition to the expansion and mobilization of TILs in the blood, which is correlated with a reduction in tumor size.

Key Opinion Leader ("KOL") webinar discussion solidifies pelareorep's opportunity in mPDAC and other gastrointestinal cancers. Presentations from KOLs and a roundtable discussion of pelareorep's clinical data in mPDAC and gastrointestinal cancers point to a potentially significant opportunity for an immunotherapeutic drug candidate that already has shown the ability to extend survival for patients (click here for the PR). Specifically, 1L mPDAC would be ideal for pelareorep as there are no immunotherapies approved for that line of treatment, multiple 1L studies have already demonstrated pelareorep's ability to improve survival in that patient population, and it is backed up by translational data showing the ability to activate the immune system and alter the tumor microenvironment so it is more amenable to therapeutic intervention.

Strategic decision to pursue registration-enabling pivotal study for pelareorep in 1L mPDAC. Discussions with regulators are underway to finalize the approval pathway for pelareorep in 1L mPDAC (click here for the PR). This includes decisions on which treatment regimens will be involved, whether to collaborate with a third party on the study, and formalizing overall survival as the primary endpoint. The prioritization of the pancreatic cancer program is based on the compelling survival and translational data from previous studies involving over 100 patients, and the particularly high unmet medical need in this indication. Pelareorep has already received Fast Track and Orphan Drug designation from the U.S. Food and Drug Administration (the "FDA") for mPDAC. If discussions with regulators proceed as expected and the feedback is positive, start-up activities for the study are expected to commence as early as Q4 2025.

Commitment to limiting dilutive financing and maximizing shareholder value. Oncolytics intends to terminate its At-the-Market financing facility with Cantor Fitzgerald and Equity Line of Credit with Alumni Capital. The Company believes it has sufficient capital to reach critical regulatory and clinical milestones this fall and pursue strategic opportunities that demonstrate pelareorep's potential without the need for near-term dilutive financings at this time. Additionally, as separately announced, the Company has given formal notice to delist from the Toronto Stock Exchange (the "TSX"). Once delisted from the TSX, the Company's common shares will continue to trade under the symbol "ONCY" on the Nasdaq.

Financial Highlights

Anticipated Milestones

Annual General Meeting and Conference Call Change

Management is hosting the Annual General Meeting later today at10:00 a.m. ET,August 8, 2025. Oncolytics' Chief Executive Officer,Jared Kelly, will provide a brief update after the formal portion of the meeting. To access the meeting as a guest (i.e., a non-voting shareholder):

Information on how to vote your shares by proxy and attend the meeting as a shareholder is available in the Company's most recent Management Information Circular (the "Circular") datedJune 18, 2025. The Circular is available on the Reports page of the investor relations section of the Company's website athttps://oncolyticsbiotech.com/investor-overview/filings/reports/and in Canadian and American securities filings.

Going forward, Oncolytics will continue to announce quarterly financial results via press releases and in securities filings, but will no longer host quarterly conference calls with the management team.

CONDENSED INTERIM CONSOLIDATED STATEMENTS OF FINANCIAL POSITION

CONDENSED INTERIM CONSOLIDATED STATEMENTS OF CASH FLOWS

About Oncolytics Biotech Inc.

Oncolytics is a clinical-stage biotechnology company developing pelareorep, an intravenously delivered immunotherapeutic agent. Pelareorep has demonstrated promising results in multiple first-line pancreatic cancer studies, two randomized Phase 2 studies in metastatic breast cancer and early-phase studies in anal and colorectal cancer. It induces anti-cancer immune responses by converting immunologically "cold" tumors "hot" through the activation of innate and adaptive immune responses.

The Company is advancing pelareorep in combination with chemotherapy and/or checkpoint inhibitors in metastatic pancreatic and breast cancers, both of which have received Fast Track designation from the FDA, and other gastrointestinal tumors. Oncolytics is actively pursuing strategic partnerships to accelerate development and maximize commercial impact. For more about Oncolytics, please visit:www.oncolyticsbiotech.comor follow the Company on social media onLinkedInand on X @oncolytics.

Forward-looking statements

This press release contains forward-looking statements, within the meaning of Section 21E of the U.S. 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 statements regarding Oncolytics' belief as to the potential, mechanism of action and benefits of pelareorep as a cancer therapeutic; its upcoming milestones; its belief that we will establish our position as the only platform immunotherapy in gastrointestinal tumors; itsplans for a potential registration-enabling pivotal study in 1L mPDAC; the anticipated potential timing of commencement of start-up activities and enrollment in a study; the focus of its discussions with the FDA in respect of the study; the anticipated trial design; its plan to delist from the Toronto Stock Exchange; its plans with respect to shareholder communications; and its plan to continue actively pursuing strategic partnerships; its goals, strategies and objectives; its belief in the clinical promise of pelareorep in mPDAC and other gastrointestinal cancers; financial projections and the sufficiency of capital to reach critical milestones and pursue strategic opportunities and its need for near-term dilutive financing. 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. These statements involve known and unknown risks and uncertainties that may cause actual results to differ materially from those anticipated. These risks include, but are not limited to, regulatory outcomes, trial execution, financial resources, access to capital markets, and market dynamics. Please refer to Oncolytics' public filings with securities regulators inthe United StatesandCanadafor more information. The Company assumes no obligation to update forward-looking statements, except as required by law.

Company ContactJon PattonDirector of IR & Communication[email protected]

Investor Relations for OncolyticsMike MoyerLifeSci Advisors+1-617-308-4306[email protected]

Media Contact for OncolyticsOwen BlaschakLifeSci Communications[email protected]

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SOURCE Oncolytics Biotech® Inc.