MUC5AC and pancreatic intraductal papillary-mucinous neoplasm: In detail, gastric-type IPMN is characterized as MUC1(−), MUC2(−), MUC5AC(−), and MUC6(+); intestinal type as MUC1(−), MUC2(+), MUC5AC(+), and MUC6(+); and pancreatobiliary type as MUC1(+), MUC2(-), MUC5AC(+), and MUC6(+).