HNF1B and carcinoma: Since we observed that HNF-1B was expressed in the majority of carcinomas arising from the pancreatic and biliary epithelium, we calculated the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy with 95% confidence interval (95% CI) of HNF-1B for all primary pancreaticobiliary carcinomas in comparison to non-pancreaticobiliary carcinomas.