HNF4A and pancreatic intraductal papillary-mucinous neoplasm: Pan-promoter HNF4α nuclear expression was higher in well-differentiated invasive IPMN compared to HG non-invasive IPMN (p = 0.0026; Supplemental Fig. S1) but this difference was not observed for P1-specific (p = 0.8021; Supplemental Fig. S2) and P2-specific isoform groups (p = 0.6260; Supplemental Fig, S3).