Gilead and Arcus announce Etrumadenant plus Zimberelimab regimen significantly reduced the risk of death in Third-line Metastatic Colorectal Cancer
- GILD and RCUS announced new data from Cohort B of ARC-9, a Phase 1b/2 study evaluating the safety and efficacy of etrumadenant, a dual A2a/b adenosine receptor antagonist, plus anti-PD-1 monoclonal antibody zimberelimab, FOLFOX chemotherapy and bevacizumab (EZFB) in third-line metastatic colorectal cancer (mCRC). These results will be presented today during an oral session at the 2024 American Society of Clinical Oncology (ASCO) Annual Meeting by Zev A. Wainberg, M.D., MSc, Co-Director of the GI Oncology Program at University of California Los Angeles and a principal investigator of the ARC-9 trial (Abstract 3508).
Cohort B of ARC-9 randomized 112 patients with comparable baseline characteristics between two arms: EZFB or regorafenib. At the time of data cut-off (November 13, 2023) median follow-up was 20.4 months. Patient baseline characteristics were similar to those of third-line patients who have progressed on oxaliplatin- and irinotecan-based regimens in mCRC1. OS and PFS were consistently longer in the EZFB arm versus regorafenib, in all sub-groups analyzed, including in patients with liver metastases.
The EZFB regimen had a safety profile consistent with the known safety profiles of each individual molecule to date, without unexpected toxicities. A higher percentage of patients treated with regorafenib (17%) had a treatment emergent adverse event (TEAE) leading to discontinuation of all study drugs than those treated with EZFB (5%). A lower percentage of patients experienced Grade =3 TEAEs attributed to etrumadenant or zimberelimab versus regorafenib (23.0% vs 25.7%).
Etrumadenant and zimberelimab are investigational molecules. Neither Gilead nor Arcus has received approval from any regulatory authority for any use of these molecules, and their safety and efficacy for the treatment of colorectal cancer have not been established.