Mucins are important markers for identifying tumour lineage and differentiating tumour subsets [5]; some mucin expression patterns indicate specific precursor lesions [6] for PDAC, such as mucinous cystic neoplasms (MCN) and intraductal papillary mucinous neoplasms (IPMN). This evidence concerns the gene MUC5AC and pancreatic intraductal papillary-mucinous neoplasm.