Immunohistochemically, the tumor cells were positive for cytokeratins (5/5, diffuse positivity with stronger expression in the center of tumor nests), epithelial membrane antigen (1/1), and S100 (5/5, with accentuation in the periphery of tumor nests) (Figs. 1D–E and 2D–E). Here, MUC1 is linked to neoplasm.