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Table 1 Classification of tumors based on presence of tumor infiltrating lymphocytes (TIL) and PD-L1 expression (based on Teng et al. [9])

From: The role of immune checkpoint inhibition in the treatment of ovarian cancer

Type I: Adaptive immune resistance
TIL+
PD-L1+
Type II: Immunological ignorance
TIL-
PD-L1-
Type III: Intrinsic induction
TIL-
PD-L1+
Type IV: Tolerance
TIL+
PD-L1-