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SERUM CONCENTRATION OF HUMAN CHORIONIC GONADOTROPIN AND ITS ALPHA AND BETA SUBUNITS. 2. TROPHOBLASTIC TUMOURS
Author(s) -
GASPARD U. J.,
REUTER AIMÉE M.,
DEVÌLLE JL.,
VRINDTSGEVAERT YVONNE,
BAGSHAWE K. D.,
FRANCHIMONT P.
Publication year - 1980
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.1980.tb03391.x
Subject(s) - sephadex , radioimmunoassay , endocrinology , human chorionic gonadotropin , medicine , molar pregnancy , alpha (finance) , gonadotropin , chemistry , glycoprotein , mole , pregnancy , beta (programming language) , size exclusion chromatography , biology , gestation , enzyme , hormone , biochemistry , surgery , genetics , construct validity , computer science , programming language , patient satisfaction
SUMMARY Using specific homologous radioimmunoassays of native hCG and its α and β subunits, we determined the levels of these glycoproteins in unfiltered maternal blood serially obtained in five non‐invasive hydatidiform moles before and after evacuation. Some of these samples were assayed after gel filtration chromatography on Sephadex G 100. Twelve samples, obtained in cases of invasive trophoblastic tumour after ablative surgery and chemotherapy, were also assessed for their hCG, hCGα and hCGβ content. In unaborted moles, mean circulating levels of native hCG and free hCGβ were considerably increased (seven and thirteen times, respectively) as compared to normal pregnancies of the same age, whereas levels of free hCGα were either normal or slightly elevated. Chromatographic analyses of molar sera confirmed the presence of free circulating subunits, and separated hCGβ in its monomeric form from its higher molecular weight form, the latter being in greater quantity than in normal pregnancy sera. In contrast, the elution profile of serum native hCG was comparable in cases of normal and molar pregnancy. Successful curettage was accompanied by a return to normal levels of the native hCG and its α and β subunits in 40–90 days. Persistence of tumour tissue was indicated by a slight increase in levels of native hCG and the β subunit. Determination of α subunit level was less useful for the detection of any relapse.