Gestational Trophoblastic Disease ECHO-Precision Diagnostic Workup for Clinical Management of GTN

Video Transcription

Video Summary

Pei Hui, a gynecologic pathologist and director of Yale’s Trophoblastic Disease Center, reviews precision diagnosis of gestational trophoblastic neoplasia (GTN), emphasizing that GTN is usually a clinical diagnosis based on pregnancy history and serial serum hCG, often without tissue confirmation.<br /><br />Accurate classification matters because different trophoblastic tumors—and their mimics—require different management. The presentation covers molar pregnancies, choriocarcinoma, placental-site trophoblastic tumor (PSTT), epithelioid trophoblastic tumor (ETT), atypical placental-site nodules, and mixed tumors. It also discusses uncommon presentations, including tumors arising in the placenta or within a mole, and disease presenting outside the uterus.<br /><br />A central message is the value of combining histology, p57 immunohistochemistry, and short tandem repeat (STR) genotyping. STR analysis can establish whether a lesion is gestational or instead a germ-cell or somatic tumor, distinguish separate pregnancies from persistent disease, and help identify the pregnancy of origin—information with major treatment and prognostic implications.<br /><br />The speaker notes that diagnostic criteria and management guidance remain unsettled for some rare entities, particularly intramolar choriocarcinoma and atypical placental-site nodules. When cases are difficult, consultation with specialist trophoblastic centers is encouraged.

Keywords

gestational trophoblastic neoplasia

GTN

trophoblastic tumors

p57 immunohistochemistry

short tandem repeat genotyping

choriocarcinoma

placental-site trophoblastic tumor

epithelioid trophoblastic tumor

molar pregnancy