Used in the treatment of various cancers by enhancing the body's immune response against tumor cells. It works by blocking the PD-1 receptor on T-cells, preventing cancer cells from evading immune detection. This antibody is particularly effective in cancers where the PD-1 pathway is exploited by tumor cells to suppress immune activity. It is being studied and applied in solid tumors such as non-small cell lung cancer, melanoma, and other malignancies with high immune evasion potential. Its use can lead to durable responses and improved survival in selected patient populations.