Immunologic heterogeneity of tumor infiltrating lymphocyte composition in primary melanoma

Tumor infiltrating lymphocytes (TILs) in primary melanomas are thought to represent the host anti-tumor immune response, but controversy exists over whether TILs offer independent prognostication of survival. We studied a cohort of 1241 primary melanoma patients to assess the association of absent, non-brisk, and brisk TIL grade with survival outcomes. We tested whether quantitative TIL counts using immunohistochemical lymphocyte markers CD3, CD45, and FOXP3 add prognostic value to TIL grading compared to histology alone in 15% of the cohort.

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