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. Commonly applied in melanoma, non-small cell lung cancer, renal cell carcinoma, Hodgkin lymphoma, and other solid tumors. Administered intravenously, it helps prolong survival and improve outcomes in patients with advanced or metastatic disease. Often used alone or in combination with other immunotherapies or chemotherapies.