KRT7 and nasopharyngeal type undifferentiated carcinoma: The features of lymphoepithelioma-like carcinoma they examined included light microscopy; immunohistochemistry for cytokeratin 7 (CK7), CK20, 34βE12, p53, α-methylacyl-CoA racemase, thyroid transcription factor-1, Epstein-Barr virus latent membrane protein-1, and CD30; in situ hybridization for human papillomavirus; and UroVysion fluorescence in situ hybridization.