Intraductal Papillary Mucinous Neoplasm (IPMN) is connected with microsatellite instability (MSI)/MMR deficient (dMMR) in 6.9% of cases, whereas dMMR in PDAC is rare—1–2%—and strongly connected with a KRAS/TP53 wild-type molecular background [158,159]. The gene discussed is TP53; the disease is pancreatic intraductal papillary-mucinous neoplasm.