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Results of immunohistochemical staining using antiprogrammed death protein‐1 (PD‐1) and PD‐ligand 1 (PD‐L1) antibodies (n = 30). Scale bars, 100 μm. (A) Positive staining for PD‐1 on tumor‐infiltrating lymphocytes. (B) Negative staining for PD‐1 on normal tissue‐infiltrating lymphocytes. (C) Positive staining for PD‐L1 on tumor cells. (D) Negative staining for PD‐L1 on normal cells.
