NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,525 terms related to cancer and medicine.
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A type of immune cell that has moved from the blood into a tumor. TILs can recognize and kill cancer cells. In cancer therapy, TILs are removed from a patient’s tumor, grown in large numbers in a laboratory, and then given back to the patient to help the immune system kill the cancer cells. Also called tumor-infiltrating lymphocyte.