IRF7 and pancreatic ductal adenocarcinoma: Moreover, immunohistochemical (IHC) validation using tissue microarrays from 20 human pancreatic ductal adenocarcinoma (PDAC) specimens revealed that the overall expression of RASSF1C and hypoxia-inducible factor-1 alpha (HIF-1α) was higher than that of UFL1 and IRF7.