MUC5AC and pancreatic intraductal papillary-mucinous neoplasm: Interestingly, both progenitor and immunogenic molecular subtypes share the same histology derived from premalignant lesions like mucinous non-cystic adenocarcinomas and intraductal papillary mucinous neoplasms (IPMN), characterized by a high mucin production (Figure 2 and Table 1) [106], different epithelial-to-mesenchymal transition markers [107], and immunohistochemical staining of CDX2 [89,90].