Question: what are the causes of gestational trophoblastic disease?
Answer: Complete hydatidiform moles. In complete hydatidiform moles, a sperm cell fertilizes an abnormal egg cell that has no nucleus (or chromosomes). ...  Partial hydatidiform moles. ...  Invasive moles. ...  Choriocarcinomas. ...  Placental-site trophoblastic tumor. ...  Epithelioid trophoblastic tumors.