Furthermore, immunohistochemically, the tumor was positive for pan-cytokeratin (AE1/AE3), epithelial membrane antigen (EMA), cytokeratin (CK) 7, CK18, CK19, epidermal growth factor receptor (EGFR), inhibin α, laminin, type IV collagen, neuron specific enolase (NSE), and mucin (MUC) 6, but negative for CK20, CA125, S-100, CD10, CA19-9, paired-box gene (PAX) 8, vimentin, CD56, MUC1, MUC2, and MUC5AC. This evidence concerns the gene MUC5AC and neoplasm.