CASE REPORTS
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Gestational and nongestational trophoblastic tumors distinguished by DNA analysis.

Cancer 1992 Februrary 2
In three patients in whom a diagnosis of gestational trophoblastic tumor was possible on the basis of pathology and elevated levels of serum human chorionic gonadotrophin, locus-specific minisatellite probes were used to identify restriction fragment length polymorphisms (RFLP) in DNA from the tumor, the patient, and her partner. On the basis of results from these studies, one tumor, originally diagnosed as a germ cell tumor, was reclassified as a gestational choriocarcinoma, whereas a second tumor, diagnosed as gestational choriocarcinoma, was shown to be of nongestational origin. In the third case, a diagnosis of gestational trophoblastic tumor was confirmed, but in this case the androgenetic origin of the tumor indicated that it was derived, not from the antecedent term pregnancy, but from a previous pregnancy with hydatidiform mole. This study clearly demonstrates the value of DNA analysis in the classification of tumors with trophoblastic differentiation.

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