Definition
Cholangiocarcinoma refers to malignancy within the biliary duct system (Bile Duct Neoplasms) and is distinct from gallbladder cancer. Cholangiocarcinomas generally have features of biliary tract epithelium, such as a glandular appearance, small regular nuclei, and scant cytoplasm. Tumor cells often express cytokeratins, mucin, and cancer-associated antigen 19-9, a carbohydrate antigen that is used as a tumor marker in serum. It is thought to be a sialylated Lewis blood group antigen. CA19-9 levels are elevated in many gastrointestinal malignancies including cholangiocarcinoma and pancreatic cancer, as well as some nonmalignant conditions such as cholangitis and peritoneal inflammation/infection. Patients who have a genetic deficiency in a fucosyltransferase specified by the Le gene are Lewisa-b- and are unable to make this antigen; thus CA19-9 testing in Lewisa-b- patients can be falsely negative.
95 % of bile duct...
References
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Mott, J.L., Gores, G.J. (2014). Cholangiocarcinoma. In: Schwab, M. (eds) Encyclopedia of Cancer. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27841-9_1106-8
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DOI: https://doi.org/10.1007/978-3-642-27841-9_1106-8
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