MUC1 and neoplasm: Immunohistochemical tests, preferably supplemented by molecular biology tests, are required to confirm the diagnosis; immunohistochemical similarities between MASC and SBC include S100 protein +, epithelial membrane antigen (EMA), and vimentin — MASC (ER/PR/Her---) has been reputed as a low-grade tumor showing microcystic, papillary cystic, ductal and glandular enhancing features.