KRT7 and neoplasm: Immunohistochemically, tumor cells were positive for CK, EMA, Vimentin, CD117, CK7, Mammaglobin (Fig. 4a), S100 (Fig. 4b) and SOX10, but negative for DOG1, CD56, Cga, Syn, CK20, Calponin, SMA, NapsinA and TTF1.