In the frame of this study, we focus on the differential expression and localization of the cell–cell contact-proteins E-cadherin and N-cadherin, markers for cell differentiation in normal epithelia of the pancreaticobiliary tract as well as in derived tumors, and demonstrate that N-cadherin positivity distinguishes intrahepatic cholangiocarcinoma from liver metastases of ductal adenocarcinoma of the pancreas. This evidence concerns the gene CDH2 and pancreatic ductal adenocarcinoma.