Zalifrelimab (AGEN1884) is a fully human IgG1 monoclonal antibody targeting CTLA-4 (CTLA-4). Zalifrelimab antagonizes the inhibitory checkpoints of immune cell activation regulated by CTLA-4 signaling.
Zalifrelimab (AGEN1884; 0.1, 1, 10 or 100 μg/mL) potently enhances antigen-specific T cell responsiveness that could be potentiated in combination with other immunomodulatory antibodies. Zalifrelimab combined effectively with PD-1 blockade to elicit a T cell proliferative response in the periphery[2].
Zalifrelimab (AGEN1884; 10 mg/kg; i.v.; on days 1 and 29) is well-tolerated in non-human primates and enhances vaccine-mediated antigen-specific immunity[2].
References:
[1]. David M O'Malley, et al. Dual PD-1 and CTLA-4 Checkpoint Blockade Using Balstilimab and Zalifrelimab Combination as Second-Line Treatment for Advanced Cervical Cancer: An Open-Label Phase II Study. J Clin Oncol. 2022 Mar 1;40(7):762-771.
[2]. Randi B Gombos, et al. Toxicological and pharmacological assessment of AGEN1884, a novel human IgG1 anti-CTLA-4 antibody. PLoS One. 2018 Apr 4;13(4):e0191926.