Agenus to Present New Clinical Data on AGEN1181 at AACR 2021
LEXINGTON, Mass., March 10, 2021 (GLOBE NEWSWIRE) -- Agenus Inc. (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, today announced that two abstracts on AGEN1181, Agenus' Fc-enhanced next-generation anti-CTLA-4 antibody, were accepted for presentation at the American Association for Cancer Research (AACR) Annual Meeting from April 10 - 15, 2021.
In a Phase 1/2 clinical study, AGEN1181 has shown responses in tumors previously unresponsive to immune therapies, including ovarian cancer and MSS endometrial and colorectal cancers. The AACR presentation will cover the most up to date data. AGEN1181 is active even in patients with the low affinity Fc?RIIIA allele, a genetic polymorphism which makes them generally unresponsive to first generation anti-CTLA-4. Further, AGEN1181 has demonstrated the ability to deplete intratumoral Tregs. Tregs are immunosuppressive T cells, and their depletion can allow for an improved antitumor immune response. Importantly, AGEN1181 is active without the neuroendocrine toxicities or hypophysitis observed with first generation agents.
The data to be presented at AACR will showcase the optimal performance of AGEN1181 in preclinical models and in clinical trials. Preclinical data show that AGEN1181’s Fc enhancement allows it to engage the immune system even in cases of patients with the low affinity FcyRIIIA allele, which first-generation molecules do not do. These data also show that across all observed populations, AGEN1181 has increased efficacy over first-generation antibodies, and that combinations with multiple agents including checkpoint inhibitors such as ani-PD-1 and anti-TIGIT, iNKT-activating therapy, and adoptive T cell therapy, could further increase that efficacy.
In addition, clinical data to date provide evidence that these observations are being borne out in patients. Responses have been observed in patients with in the low-affinity FcyRIIIA allele. Further, AGEN1181 is the first anti-CTLA-4 to show intratumoral Treg depletion in the clinic.
AGEN1181 is currently advancing in a Phase 2 trial in colorectal cancer alone and in combination with balstilimab, Agenus’ anti-PD-1 antibody. As of February 9, Agenus has reported 6 confirmed objective clinical responses in its AGEN1181 Phase 1/2 trial and no complement-mediated toxicities.
Abstract title: Fc-enhanced anti-CTLA-4 antibody, AGEN1181: New mechanistic insights for potent antitumor immunity and combination potential in treatment-resistant solid tumors
Abstract title: Characterization of the pharmacodynamic activity of AGEN1181, an Fc-enhanced CTLA-4 antibody, alone and in combination with the PD-1 antibody balstilimab
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