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Case 14: a, b Core biopsy showing brisk PD-L1 IHC staining of peritumoral immune cells as well as membranous staining of tumor cells at the tumor-stromal interface. The overall CPS score for this biopsy was 40%. c, d The resected lymph node shows abundant membranous staining of tumor cells as well as labeling of peritumoral immune cells. The overall CPS score of this specimen was 75%
