HCG

(Human chorionic gonadotropin)
Assessments
Characteristics
HCG is a glykoprotein hormon, 38 kDa, produced in large amounts by placental syncytiotrophoblast cells. It consists of a specific ?-chain and a ?-chain common for several polypeptide hormones. Outside the placenta HCG has been demonstrated in some pituitary cells and in reactive gastrointestinal epithelium.
Neoplasms
HCG is found in moles and choriocarcinoma, chorionic components of germ cell tumours, and syncytiotrophoblast like cells in seminoma/dysgerminoma and embryonal carcinoma. ”Ectopic” HCG may be demonstrated in carcinomas like adenocarcinomas of the gastrointestinal tract, prostate, breast and small cell carcinoma, as well as carcinoid tumour and hepatocellular carcinoma.
Application
Classification of germ cell tumours, identification of extragonadal germ cell tumours.
Selected references
Kovalevskaya G, Genbacev O, Fisher SJ, Caceres E, O'Connor JF. Trophoblast origin of hCG isoforms: cytotrophoblasts are the primary source of choriocarcinoma-like hCG. Mol Cell Endocrinol. 2002 Aug 30;194(1-2):147-55. Louhimo J, Nordling S, Alfthan H, von Boguslawski K, Stenman UH, Haglund C. Specific staining of human chorionic gonadotropin beta in benign and malignant gastrointestinal tissues with monoclonal antibodies. Histopathology. 2001 May;38(5):418-24. Ozbilim G, Karaburun SP, Zorlu G, Kaya R, Erdogan G, Karaveli S. Immunohistochemical staining properties of PCNA, Ki-67, p53, beta-hCG and HPL in trophoblastic disease. Eur J Gynaecol Oncol. 2000;21(2):200-4. Losch A, Kainz C. Immunohistochemistry in the diagnosis of the gestational trophoblastic disease. Acta Obstet Gynecol Scand. 1996 Sep;75(8):753-6. Kido A, Mori M, Adachi Y, Yukaya H, Ishida T, Sugimachi K. Immunohistochemical expression of beta-human chorionic gonadotropin in colorectal carcinoma. Surg Today. 1996;26(12):966-70.
19.06.04 - MV/LE