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(A) Lymphoepithelioma-like carcinoma is an undifferentiated carcinoma with predominant lymphocytic infiltration (haematoxylin and eosin-stained, original magnification ×200). (B) Positive P63 expression (original magnification ×200). (C) Positive CK5/6 expression (original magnification ×100). (D) Positive signals in the nuclei of cancer cells (in situ hybridization for EBER, original magnification ×200). EBER: Epstein–Bar virus-encoded RNA.
