On December 10, 2021 Oncolytics Biotech Inc. (NASDAQ: ONCY) (TSX: ONC) reported a positive interim safety update from the investigator-sponsored, phase 2 IRENE trial in a poster presentation at the 2021 San Antonio Breast Cancer Symposium (SABCS) (Press release, Oncolytics Biotech, DEC 10, 2021, View Source [SID1234596760]).
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The IRENE trial is designed to evaluate the safety and efficacy of pelareorep in combination with Incyte’s anti-PD-1 checkpoint inhibitor retifanlimab for second- or third-line treatment of patients with metastatic triple-negative breast cancer (TNBC). Safety data from the trial show that the combination has been well-tolerated, as no safety concerns have been noted in any of the five patients enrolled in the trial at the time of reporting. The trial remains ongoing and will continue to enroll patients at the Rutgers Cancer Institute of New Jersey and the Ohio State University Comprehensive Cancer Center.
Mridula George, M.D., Medical Oncologist, Rutgers Cancer Institute of New Jersey, Assistant Professor of Medicine, Rutgers Robert Wood Johnson Medical School, and principal investigator of the trial commented, "Checkpoint inhibitors benefit only a minority of TNBC patients due to immunosuppressive tumor microenvironments (TMEs) and poor PD-L1 expression. Prior clinical studies have shown that pelareorep upregulates tumor PD-L1 expression and reverses immunosuppressive TMEs. These findings suggest that pelareorep can address a pressing unmet need in TNBC by synergizing with PD-1 inhibition to increase the proportion of patients responding to therapy. We look forward to evaluating this hypothesis through the IRENE study’s continued advancement and are pleased that the pelareorep-retifanlimab combination has been well-tolerated in each of the patients enrolled in the trial."
In addition to evaluating the safety and efficacy of pelareorep plus retifanlimab, IRENE is also designed to assess changes in PD-L1 expression and correlations between treatment outcomes and changes in peripheral blood T cell populations. This could provide a potential biomarker of pelareorep response that may enable the success of future registrational trials by allowing for the early identification of patients most likely to respond to therapy.
A copy of the SABCS poster titled, "IRENE study: Phase 2 study of Retifanlimab and the oncolytic virus pelareorep in metastatic triple negative breast cancer," will be available on the Posters & Publications page of Oncolytics’ website (LINK) following the conclusion of the symposium.
About IRENE
The IRENE (INCMGA00012 and the oncolytic virus pelareorep in metastatic triple-negative breast cancer) study is a single-arm, open-label, phase 2 study evaluating the combination of pelareorep and Incyte’s anti-PD-1 checkpoint inhibitor retifanlimab (INCMGA00012) for the second- or third-line treatment of unresectable locally advanced or metastatic triple-negative breast cancer. The study will enroll 25 patients and is being conducted at the Rutgers Cancer Institute of New Jersey and The Ohio State University Comprehensive Cancer Center.
Study participants will receive pelareorep intravenously on days 1, 2, 15, and 16 of 28-day treatment cycles. Retifanlimab will be administered on day 3 of each cycle, with treatment cycles continuing until disease progression is observed. The co-primary endpoints of the study are safety and objective response rate. Secondary endpoints include progression-free survival, overall survival, and duration of response. Exploratory endpoints include peripheral T cell clonality and pre- vs. post-treatment change in tumor PD-L1 expression.
For more information on the IRENE study, refer to View Source