Identification of causative pregnancy of gestational trophoblastic neoplasia diagnosed during pregnancy by short tandem repeat analysis.
•Gestational trophoblastic neoplasia can arise during the first trimester originating from trophoblasts of concurrent pregnancy.•Intraplacental choriocarcinoma can be developed from trophoblasts of a previous pregnancy.
['Yamamoto|Eiko|E|', 'Niimi|Kaoru|K|', 'Shinjo|Kanako|K|', 'Yamamoto|Toshimichi|T|', 'Fukunaga|Masaharu|M|', 'Kikkawa|Fumitaka|F|']
Pregnancy Short tandem repeat DNA analysis Intra-placental choriocarcinoma Placental site trophoblastic tumor