Gestational Trophoblastic Disease

Gestational trophoblastic disease (GTD) is a group of tumors defined by abnormal trophoblastic proliferation. Trophoblast cells produce human chorionic gonadotropin (hCG). GTD is divided into hydatidiform moles (contain villi) and other trophoblastic neoplasms (lack villi). The non-molar or malignant forms of GTD are called gestational trophoblastic neoplasia (GTN). They include the invasive mole, choriocarcinoma, placental site trophoblastic tumor, and epithelioid trophoblastic tumor. These malignancies can occur weeks or years following any pregnancy but occur most commonly after a molar pregnancy.