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Immunohistochemistry assay of PD-L1 protein and EBV status. PD-L1 (B7-H1) was negative in tumor tissue by immunohistochemistry assay (A) and EBV virus was absent by using EBV-encode small RNA (EBERs) in situ hybridization (B). Scale bar: 50 µm. Original magnification: 400×.
