On September 16, 2021 Agenus (NASDAQ: AGEN), an immuno-oncology company with an extensive pipeline of checkpoint antibodies, cell therapies, adjuvants, and vaccines designed to activate immune response to cancers and infections, reported that final results from the Bal/Zal combination study at the European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Virtual Conference 2021 in an abstract titled Balstilimab (anti-PD-1) in combination with zalifrelimab (anti-CTLA-4): final results from a Phase 2 study in patients (pts) with recurrent/metastatic (R/M) cervical cancer (CC) (Press release, Agenus, SEP 16, 2021, View Source [SID1234587897]).
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The data are being presented by lead investigator Dr. David O’Malley, Professor of Obstetrics and Gynecology at The Ohio State University College of Medicine and the Director of the Division of Gynecologic Oncology, The Ohio State University Comprehensive Cancer Center – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC – James).
"With a median follow-up of almost 2 years, the Bal/Zal combination showed high response rates, durable clinical activity, and promising overall survival results", said Steven O’Day, MD, Chief Medical Officer of Agenus. "Furthermore, later this year we expect to present new data on our next-generation CTLA-4 inhibitor AGEN1181, which we expect to further define the positive role this combination strategy could have in addressing unmet needs for cancer patients."
The Phase 2 trial was conducted in 155 patients with recurrent/metastatic cervical cancer (R/M CC) which has limited effective treatment options and disproportionately affects younger women. In the 125 evaluable patients, the objective response rate (ORR) in all patients was 26%, with 9% of patients achieving a complete response, and 17% of patients achieving a partial response. The median duration of response (DoR) was not reached after a 19.4-month median follow-up. Notably, responses were also observed in the PD-L1 negative and adenocarcinoma populations, with 9% of both patient groups achieving an ORR. Based on these observations, we predict more than half of the patients to be alive beyond 12 months*.
The Bal/Zal combination continued to show no unexpected toxicities and no new safety signals were identified.
Detailed results from this trial will be presented in a Mini Oral Session on September 19th from 11:35 – 11:40am ET by David O’Malley, MD. In addition, in a Trials in Progress abstract, Agenus presented the RaPiDS trial design for balstilimab alone or in combination with zalifrelimab as second-line treatment for patients with previously treated R/M CC.
"This trial represents the largest study evaluating PD-1 + CTLA-4 inhibition in relapsed cervical cancer to date and shows that the combination could represent a meaningful new option for patients in this setting," said Dr. O’Malley. "Efficacy outcomes continued to improve over time, and the combination likewise continued to show a positive safety profile."
* Updated data to be presented during September 19th Mini Oral session.