NCF1 and pancreatic ductal adenocarcinoma: Intensity of NCF-1 expression in PDAC tissues was comparably weaker than that in gastric cancer tissues, but cytoplasmic staining for NCF-1 was also observed in all 10 cases of invasive pancreatic ductal adenocarcinomas (PDACs) in both tumor nests and inflammatory cells (Fig. 1B, six representative cases).