Oncolytics Biotech Announces Updated Randomized Phase 2 Data from BRACELET-1 Metastatic Breast Cancer Trial that Show Pelareorep Driving Robust Increases in Progression-Free Survival and Confirmed Overall Response Rate

Pelareorep-paclitaxel combination reduced risk of disease progression by 71% (hazard ratio of 0.29) compared to paclitaxel monotherapy

37.5% confirmed overall response rate with pelareorep-paclitaxel vs. 13.3% with paclitaxel monotherapy

12-month progression-free survival rate of 32.8% for pelareorep-paclitaxel compared to 0% for paclitaxel monotherapy and 0% for pelareorep-paclitaxel-avelumab

Oncolytics' HR+/HER2- breast cancer program now phase 3-ready and advancing to a registrational study of pelareorep-paclitaxel combination

Data to be discussed during a key opinion leader webinar today, June 5^th at 8:00 a.m. ET (registration link here)

SAN DIEGO and CALGARY, AB, June 5, 2023 /PRNewswire/ -- Oncolytics Biotech Inc. (NASDAQ: ONCY) (TSX: ONC) today announced updated results from BRACELET-1, a randomized phase 2 trial in HR+/HER2- metastatic breast cancer, which include data featured in an oral presentation at the 2023 American Society of Clinical Oncology (ASCO) Annual Meeting, as well as additional new data and analyses. 

BRACELET-1 enrolled 48 patients, including 45 that were randomized and well-balanced across three cohorts evaluating: (1) paclitaxel monotherapy; (2) paclitaxel in combination with pelareorep; and (3) paclitaxel plus pelareorep in combination with the anti-PD-L1 checkpoint inhibitor, avelumab (Bavencio). A three-patient safety run-in was also conducted with patients receiving pelareorep, paclitaxel, and avelumab prior to randomization. All participants enrolled in the trial had previously progressed on at least one hormone-based therapy with a CDK 4/6 inhibitor. No patients in BRACELET-1 received chemotherapy for metastatic disease prior to enrolling in the trial.  

Updated data from BRACELET-1 showed a median progression-free survival (mPFS) of 9.5 months in the paclitaxel plus pelareorep cohort vs. 6.3 months in the paclitaxel monotherapy cohort for a hazard ratio of 0.29 as of a March 3, 2023 cut-off date. Confirmed overall response rate (ORR) in these cohorts was 37.5% and 13.3%, respectively. As previously reported, ORR at week-16 (the trial's primary endpoint) in the pelareorep plus paclitaxel and paclitaxel monotherapy cohorts was 31.3% and 20%, respectively. Overall survival data from the trial continue to mature.