CK5&6

Cytokeratin 20 (CK20) is an acidic cytokeratin, present in all epithelial cells and some non-epithelial cells, gastrointestinal cancer, Merkel cell carcinoma, pancreatic cholangiocarcinoma, salivary gland small cell carcinoma, intestinal carcinoid, ovarian cancer Mucinous adenocarcinoma, etc. are also expressed. It can be used for the differential diagnosis of small cell carcinoma, and it can be used in combination with CK7 and Villin as an index to judge the primary site of cancer.