Site-Specific Factor 20

Tumor Infiltrating Lymphocytes (TIL)


**Note 1:** Tumor infiltrating lymphocytes (TILs) are white blood cells that have migrated into a tumor from the bloodstream. They are believed to represent an immune reaction/response to the tumor cells. A brisk response may indicate a favorable prognosis. **Note 2:** Code the status of tumor infiltrating lymphocytes (TIL) in the primary tumor as documented in the pathology report.




NAACCR #2874
Code Description
000 No tumor infiltrating lymphocytes (TIL) present
010 TIL present, non-brisk
020 TIL present, brisk
030 TIL present, NOS
988 Not applicable: Information not collected for this case
998 No histologic examination of primary site
999 Unknown or no information
Not documented in patient record