Immunohistochemistry showed that the IPMN component was MUC1 (+)/MUC2 (+)/MUC5AC (+)/CDX2 (+)/p-CK (+)/CK19 (+)/P53 (20%)/Ki67 (15–30%) (Fig. 2). The gene discussed is MUC5AC; the disease is pancreatic intraductal papillary-mucinous neoplasm.