Tumor-Infiltrating Lymphocytes (TIL)

Tumor-Infiltrating Lymphocytes (TILs) are immune cells, specifically a type of white blood cell called lymphocytes, that have moved into a tumor. They represent the body's natural response to recognize and attack cancer cells. The presence and activity of TILs can indicate how the immune system is fighting the cancer and are important for cancer prognosis and treatment strategies, such as immunotherapy. In essence, TILs are immune soldiers that infiltrate tumors, and their analysis helps doctors understand the immune response within the tumor environment.