Immunohistochemically, pancreatic tumor cells were positive for epithelial markers (AE1/AE3 and CAM5.2), CK19, EMA, synaptophysin (Fig. 2e), somatostatin, INI1, BAF155, BAF170, and ARID1A; weakly positive for NCAM, gastrin, and BRG-1; and negative for chromogranin A, β-catenin, trypsin, glucagon, insulin, and vimentin. This evidence concerns the gene CHGA and pancreatic neoplasm.