Cytokeratin 20

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CK20 staining in small intestine.

Cytokeratin 20, abbreviated CK20, is a commonly used immunostain. It is also known as keratin 20.


CK20 positive and CK7 negative

Partially CK20 positive

CK20 positive and CK7 positive


See also


  1. Chu, P.; Wu, E.; Weiss, LM. (Sep 2000). "Cytokeratin 7 and cytokeratin 20 expression in epithelial neoplasms: a survey of 435 cases.". Mod Pathol 13 (9): 962-72. doi:10.1038/modpathol.3880175. PMID 11007036.
  2. Eschbacher, JM.; Coons, SW. (2006). "Cytokeratin CK20 is a sensitive marker for Crooke's cells and the early cytoskeletal changes associated with hypercortisolism within pituitary corticotrophs.". Endocr Pathol 17 (4): 365-76. PMID 17525485.