Pathological complete response and two-year disease-free survival in a primary gastric choriocarcinoma patient with advanced liver metastases treated with germ cell tumor-based chemotherapy: a case report.

Choriocarcinoma is an early metastasizing and highly invasive tumor and characterized as a high-level human chorionic gonadotropin-secreting tumor. It normally arises in the gestational trophoblast, gonads and much less frequently in the stomach. Primary gastric choriocarcinoma appears to have a poor prognosis; especially with liver metastasis, the survival period is expected to be <1 month. This unfavorable clinical outcome is partly due to the lack of defined chemotherapy against primary gastric choriocarcinoma. We herein report a case of a 68-year-old male primary gastric choriocarcinoma patient with advanced liver metastases in which germ cell tumor-based chemotherapy achieved a pathological complete response and 2-year disease-free survival.