AMACR and neoplasm: Immunohistochemically, the tumor cells were positive for cytokeratin (CK) 7 (clone OV-TL 12/30, ready to use; Agilent Technologies, Santa Clara, CA) (Fig. 3b), paired box gene (PAX) 8 (clone MRQ-50, ready to use; Roche, Mannheim, Germany), and vimentin but negative for alpha-methylacyl-CoA racemase (AMACR) (clone 13H4, ready to use; Agilent Technologies) (Fig. 3c) and CD10 (clone SP67, ready to use; Roche).