tumor-infiltrating lymphocytes

Tumor-infiltrating lymphocytes (TILs) are immune cells, primarily a type called lymphocytes, that naturally enter and accumulate within a tumor. They are part of the body's immune response, trying to recognize and attack cancer cells. The presence and activity of TILs can indicate how the immune system is responding to the tumor and may influence treatment options. Researchers are studying TILs to understand their role in cancer progression and to develop immunotherapies that enhance these immune cells to better fight cancer.