In this article, we will introduce a potent humanized IgG4k monoclonal antibody against programmed death-1 (PD-1) Geptanolimab. As a result, Geptanolimab inhibits the binding of PD-L1/L2 to PD-1 through a competitive action. As a result, Geptanolimab (CBT-501) has highly specific binding to PD-1 of humans (KD=505 pM) and cynomolgus...