Late recurrences of gestational trophoblastic neoplasia.

Presented are two cases of recurrence of gestational trophoblastic neoplasia more than 1 year after apparently successful therapy. Both patients initially had had nonmetastatic disease, were clinically free of disease, and had had repetitively negative serum radioimmunoassay titers for the beta subunit of human chorionic gonadotropin for 2 to 3 years. The development of these late recurrences re-emphasizes the need for prolonged follow-up monitoring of patients after apparently successful therapy for gestational trophoblastic neoplasia.