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Case 16 a, b Core biopsy showing absent PD-L1 IHC staining of immune cells with focal nonspecific tumor cell staining and scattered immunoreactive stromal cells. The CPS score was 0%. c, d The corresponding resected oropharyngeal tumor shows scattered clusters of immunoreactive peritumoral immune cells as well as scattered intratumoral immune cells. The overall CPS score of this specimen was 5%
