Immunohistochemically, the tumor cells were positive for S100 (5/6), cyclin D1 (2/3), SATB2 (2/3), BCOR (2/4), and TLE1 (1/3) while negative for MUC4 (0/6), keratin (0/5), EMA (0/4), desmin (0/6), CD34 (0/6), SMA (0/5), SOX10 (0/5), and melanoma cocktail (0/2). The gene discussed is MUC4; the disease is neoplasm.