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Because the keratin-7 antigen is found in both healthy and neoplastic cells, antibodies to CK7 can be used in immunohistochemistry to distinguish ovarian and transitional cell carcinomas (staining positive) from colonic and prostate cancers (negative), respectively. It is commonly used together with CK20 when making such diagnoses. [8]
Keratin 20, often abbreviated CK20, is a protein that in humans is encoded by the KRT20 gene. [5] [6] [7]Keratin 20 is a type I cytokeratin.It is a major cellular protein of mature enterocytes and goblet cells and is specifically found in the gastric and intestinal mucosa.
Micrograph of adenosquamous carcinoma of the pancreas. Light microscopy shows a combination of gland-like cells and squamous epithelial cells. [4] On immunohistochemistry, it is typically positive for CK5/6, CK7 and p63, and negative for CK20, p16 and p53. On genetic testing, KRAS and p53 are typically altered. [4]
A subgroup of glandular epithelia and their tumors [6] Transitional epithelium and transitional carcinoma [6] Cytokeratin 8: Glandular epithelia of the digestive, respiratory and urogenital tracts, both endocrine and exocrine cells, as well as mesothelial cells; Adenocarcinomas originating from those above [6] Cytokeratin 10: Keratinized ...
Primary EMPD tests positive for CK7 but negative for CK20, whereas secondary is positive for both. [15] Lack of positivity for hormone receptors and HER2 protein is overexpressed meaning that the cells are dividing rapidly and can be indicate an aggressive and more recurrent disease. [citation needed]
CK7; p63; Negative for: CK20; p16; ... which have significant negative side effects. ... for about 1 to 2% of all pancreatic tumors. [28] The definition and ...
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Immunohistochemistry may help in diagnosing Krukenberg tumors from primary ovarian neoplasms [7] but needs to be applied with discretion. [8] For example, tumors that are immunoreactive to CEA or cytokeratin 20 (CK20) and negative for cytokeratin 7 (CK7) may be more likely to be of colorectal origin. [2]