However, beyond this general rule, some carcinomas are known for their lack of immunophenotypes, i.e., pancreatic carcinoma generally show K7+/K20+, even though it can lose K7; gastric adenocarcinoma can show all K7/K20 phenotypes; and cholangiocarcinoma can overlap with pancreatic carcinoma [35,36,37]. This evidence concerns the gene KRT7 and cholangiocarcinoma.