Immunohistochemically, the tumor cells were positive for vimentin, cell adhesion molecule 5.2 (CAM5.2), epithelial membrane antigen (EMA), and E26-related gene (ERG) (Fig. 3a–c); they were negative for AE1/AE3, CD34, S100, smooth muscle actin, and CD31. The gene discussed is MUC1; the disease is neoplasm.