Safety and biologic activity of a bispecific T cell receptor targeting HIV Gag in males living with HIV: a first-in-human trial

Abstract HIV persistence in reservoirs despite antiretroviral therapy (ART) is a barrier to a permanent cure. We present the affinity-enhanced TCR bispecific IMC-M113V as a potential therapeutic for targeted HIV reservoir elimination. Preclinical studies demonstrate that IMC-M113V redirects T cells towards cells expressing the variable viral peptide, Gag 77-85, presented by HLA-A*02:01 at low copy number, without binding to HIV-negative cells. Here, we conduct a first-in-human, open-label single ascending dose study of IMC-M113V (1.6-15 µg) in twelve HLA-A*02:01-positive males living with HIV on suppressive ART (EudraCT number 2021-002008-11). Participants receive one intravenous infusion of IMC-M113V on Day 1 and are monitored through Day 29 to evaluate safety, tolerability (primary endpoints) and pharmacodynamic (PD) activity (secondary endpoint). IMC-M113V is well tolerated and not associated with any serious adverse event. PD activity is dose-dependent and strongest in participants with highly IMC-M113V-sensitive Gag 77-85 variant sequences. Thus, we provide a promising foundation to evaluate multiple and higher doses of IMC-M113V as a strategy for achieving ART-free virological control.