MUC1 and pancreatic ductal adenocarcinoma: Chu et al. reported positive expression of CK7, CK20, and MUC2 in the histological intestinal-type and positive expression of CK7 and MUC1 in the histological pancreatobiliary-type and that ACs of pancreatobiliary origin showed immunophenotypes similar to that of pancreatic ductal carcinoma[6].