This study is an open-label, Phase 1 study to evaluate the safety, tolerability, PK, and
pharmacodynamic profiles of AGEN1223 as a single-agent and in combination with balstilimab,
as well as to assess the maximum tolerated dose and determine the RP2D of AGEN1223 as a
single-agent and in combination with balstilimab in subjects with advanced solid tumors.