Sintilimab (IBI308) is a humanized IgG4 monoclonal antibody with significant anti-tumor activity that restores endogenous anti-tumor T-cell responses by binding to PD-1 and thereby blocking the interaction of PD-1 with its ligands (PD-L1 and PL-L2).

PD1-PD L1 inhibitor Polaris is a novel potent, small molecule inhibitor of PD-1/PD-L1.

Nivolumab anti-PD-1) is a genetically engineered fully human immunoglobulin Ig) G4 monoclonal antibody directed against the negative immunoregulatory human cell surface receptor programmed death-1PD-1PCD-1) with immune checkpoint inhibitory and antineoplastic activities.