DES and neoplasm: The tumor was negative for S100 protein (Fig.2d), cytokeratin (CK), glial fibrillary acidic protein (GFAP), CK7, SOX10, CD31, CD34 (Fig.2e), desmin, MyoD1, myogenin, smooth muscle actin (SMA), CD117, β-catenin and MUC4.