Coexistence of gastric choriocarcinoma and adenocarcinoma with reproductive hormone secretion in a man: a case report.

The present study reports a rare case of a 65-year-old male patient with an exophytic ulcerative lesion in the gastric antrum. After performing a radical subtotal gastrectomy with D2 lymph node dissection and Billroth I gastrojejunostomy, histological analysis revealed a poorly differentiated adenocarcinoma combined with a biphasic pattern consisting of cytotrophoblasts and syncytiotrophoblasts. Immunohistochemical analysis showed a positive reaction with an anti-β-human chorionic gonadotropin antibody, and an abnormal increase in reproductive hormones. Furthermore, the patient succumbed to upper gastrointestinal hemorrhage in less than 3 months after the initial diagnosis, although the rupture of his liver metastasis was successfully treated by transhepatic artery embolization during the second admission.