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 tumors from evading immune detection. This antibody is particularly effective in treating solid tumors such as non-small cell lung cancer, melanoma, and other malignancies where PD-1 pathway activation suppresses immune activity. It is administered intravenously and often used when other treatments have failed or in combination with other immunotherapies to improve clinical outcomes.