Used in the treatment of various cancers by blocking the PD-L1 protein on tumor cells, which helps the immune system recognize and attack cancer cells more effectively. It is primarily applied in immunotherapy for non-small cell lung cancer, melanoma, and other solid tumors where PD-L1 is overexpressed. Enhances T-cell activation and reduces immune evasion by tumors. Administered intravenously, often in combination with other checkpoint inhibitors or chemotherapy agents to improve clinical outcomes.