Used in cancer immunotherapy to stimulate the immune system by activating T cells. Binds to the 4-1BB receptor, a costimulatory molecule on T cells, enhancing their proliferation, survival, and cytotoxic activity. This promotes stronger anti-tumor immune responses. Investigated in clinical trials for solid tumors and hematologic malignancies, often in combination with other immunotherapies like checkpoint inhibitors. Aims to improve outcomes by boosting the body’s natural defenses against cancer.