Collaborative Stage Data Set - Revised 11/12/2010 FINAL

MerkelCellSkin

CS 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.

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 (If this information is required by your standard setter, use of code 988 may result in an edit error.)
998	No histologic examination of primary site
999	Unknown or no information Not documented in patient record