A diverse group of pregnancy-related tumors characterized by excessive proliferation of trophoblasts. Representative examples include hydatidiform mole, gestational choriocarcinoma, and placental site trophoblastic tumor. The disease is MONDO_0018944 (gestational trophoblastic neoplasm). Also known as: GTN, GTT, gestational trophoblastic neoplasia, gestational trophoblastic tumor, gestational trophoblastic tumour.