MUC5AC and pancreatic intraductal papillary-mucinous neoplasm: The most common types of PCNs (Figure 1) are mucin-producing intraductal papillary mucinous neoplasms (IPMNs, encompassing branch-duct IPMNs, main-duct IPMNs and mixed-type IPMNs) and mucinous cystic neoplasms (MCNs).