KRT7 and colorectal adenocarcinoma: Research revealed positive CK-20 in 70%–95% of colorectal carcinomas and in 20%–40% of pancreaticobiliary adenocarcinomas and positive CK-7 in 90%–100% of pancreaticobiliary adenocarcinoma and in 5%–25% of colorectal adenocarcinomas (6).