NCIt definition : A monoclonal antibody directed against the negative immunoregulatory human cell surface
receptor programmed cell death 1 (PD-1), with potential immune checkpoint inhibitory
and antineoplastic activities. Upon administration, tislelizumab binds to PD-1 and
inhibits the binding of PD-1 to the PD-1 ligands programmed cell death-1 ligand 1
(PD-L1), and PD-1 ligand 2 (PD-L2). This prevents the activation of PD-1 and its downstream
signaling pathways. This may restore immune function through the activation of both
T-cells and T-cell-mediated immune responses against tumor cells. PD-1, a transmembrane
protein in the immunoglobulin (Ig) superfamily expressed on activated T-cells, negatively
regulates T-cell activation and effector function when activated by its ligands; it
plays an important role in tumor evasion from host immunity.;