Oncolytics Biotech Announces Positive Randomized Phase 2 Data from BRACELET-1 Metastatic Breast Cancer Trial By Investing.com

Oncolytics Biotech (NASDAQ:)^® Inc. (ONCY) today announced positive results from BRACELET-1, a randomized phase 2 trial in HR+/HER2- metastatic breast cancer. The results are published in an abstract accepted for an oral presentation at the upcoming American Society of Clinical Oncology (ASCO) Annual Meeting, taking place from June 2 – 6, 2023 in Chicago, Illinois and online. The abstract is available on the ASCO Annual Meeting website.

BRACELET-1 enrolled 48 patients 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^®). All participants enrolled in the trial previously progressed on at least one hormone-based therapy with a CDK 4/6 inhibitor.

Compared to the paclitaxel monotherapy cohort, the cohort evaluating the combination of paclitaxel plus pelareorep showed ≥50% improvements on the trial’s primary endpoint of overall response rate (ORR) at week 16 (31.3% vs. 20%) as of the ASCO abstract cut-off date (October 2022). This cohort also reported median progression-free survival (mPFS) of 9.6 months vs. 6.4 months as of the cut-off date. Overall survival data from the trial continue to mature. Data from this study validate the results of IND-213, a prior phase 2 trial that showed a statistically significant near doubling of median overall survival in HR+/HER2- metastatic breast cancer patients treated with pelareorep combined with paclitaxel (21.0 months, n = 28) vs. those treated with paclitaxel alone (10.8 months, n = 29).

“BRACELET-1 substantially de-risks our HR+/HER2- breast cancer program by providing a second randomized dataset showing pelareorep plus paclitaxel outperforming paclitaxel alone,” said Dr. Matt Coffey, President and Chief Executive Officer. “Importantly, evidence of pelareorep’s ability to synergistically enhance paclitaxel’s efficacy has now been seen consistently across multiple clinical efficacy endpoints of overall survival, progression-free survival, and ORR. With these data, our program is phase 3-ready, and efforts to expeditiously advance to a two-arm registrational study of pelareorep-paclitaxel combination therapy are well underway. I would like to thank BRACELET-1’s participants as well as our…