HNF4A and pancreatic intraductal papillary-mucinous neoplasm: In the pan-promoter HNF4α isoform group, poorly differentiated invasive components showed an increase in cytoplasmic expression relative to well-differentiated invasive components (p = 0.0005), but there was no difference in cytoplasmic pan-promoter HNF4α expression between low-grade and high-grade IPMN components (p = 0.9186) or between high-grade and well-differentiated invasive components (p = 0.1108).