Tislelizumab (BGB-A317; Anti–PD-1 Monoclonal Antibody)

Proposed Mechanism of Action

Tislelizumab is a monoclonal antibody against programmed cell death protein 1 (PD-1), an immune checkpoint protein that inhibits T-cell response.² Preclinical studies suggest that tumors may upregulate expression of PD-1 ligands (PD-L1 and PD-L2) as a mechanism of immune resistance.² Blocking the binding of PD-L1 and PD-L2 to PD-1 may restore the T-cell–mediated antitumor response.³

Some preclinical study results have suggested that anti–PD-1 antibodies bound to PD-1 on T cells may also bind to Fc gamma receptors (FCɣRs) on macrophages, which can lead to phagocytosis of the T cell which may compromise antitumor activity.^1,4 Anti–PD-1 antibodies can be designed to potentially minimize FCɣR binding.^1,4

The safety and efficacy of the agents and/or uses under investigation have not been established. There is no guarantee that the agents will receive health authority approval or become commercially available in any country for the uses being investigated.

Tislelizumab (BGB-A317), an anti-programmed cell death protein 1 (PD-1) monoclonal antibody, is being developed in collaboration with BeiGene, Ltd.