Oncolytics Biotech® Reports FDA Regulatory Milestone and Strong Clinical Progress in Randomized RAS-Mutant MSS Colorectal Cancer Trial

About this update from Oncolytics Biotech Inc.

Half of planned clinical sites will be activated this month; more than 20 patients have been pre-identified across participating centers Company to hold Type D meeting with FDA to discuss a potential registrational pathway through the addition of Part B to the existing REO 033 trial design Part B will be a randomized study designed to support potential accelerated and full approval SAN DIEGO, July 13, 2026 (GLOBE NEWSWIRE) -- Oncolytics Biotech® Inc. (Nasdaq: ONCY) ("Oncolytics" or the "Company"), a clinical-stage company developing pelareorep, an investigational, systemically active immunotherapy that promotes potentially protective immune responses, including the upregulation of key inflammatory cytokines resulting in the formation of tertiary lymphoid structures and the expansion of tumor-infiltrating lymphocytes, today provided a clinical and regulatory update on REO 033, the Company's randomized controlled study evaluating pelareorep in combination with folinic acid, fluorouracil and irinotecan ("FOLFIRI") and bevacizumab for the second-line treatment of patients with Rat Sarcoma ("RAS")-mutant, microsatellite stable ("MSS") metastatic colorectal cancer. REO 033 builds upon the previously reported REO 022 study, which more than doubled historical standard-of-care benchmarks across progression-free survival, overall survival, duration of response, and objective response rate.1-4 Based on these data, pelareorep has received Fast Track designation from the U.S. Food and Drug Administration ("FDA") for this indication. The multi-part randomized REO 033 study is designed to prospectively validate these encouraging findings against a contemporary control arm while advancing pelareorep toward a potential registration pathway. The Company continues to make rapid operational progress in Part A of REO 033 (n=60 patients), with approximately half of the planned clinical sites activated by the end of July, and more than 20 patients have been pre-identified across participating centers. The remaining sites are expected to be activated by the end of August, positioning the study for accelerated enrollment during the second half of 2026. Most recently, global lead principal investigator Dr. Sanjay Goel and his team opened enrollment at Rutgers Cancer Institute of New Jersey. "The magnitude and durability of the efficacy observed in REO 022 warrant earnest evaluation in a randomized setting," said Dr. Sanjay Goel, Global Lead Principal Investigator for REO 033 and Professor of Medicine and Director of the Phase I Program at Rutgers Cancer Institute of New Jersey. "It is encouraging to see REO 033 expanding rapidly across leading academic centers, and I believe this study has the potential to further define the role of pelareorep in RAS-mutant MSS metastatic colorectal cancer."

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