Late spontaneous resolution of persistent molar pregnancy.

Objective: To determine the outcome of women with persistently raised but falling human chorionic gonadotrophin (hCG) levels 6 months after surgical evacuation of a molar pregnancy.

Design: An 11-year retrospective review.

Setting: The United Kingdom supra-regional trophoblastic disease treatment centres at Weston Park Hospital (Sheffield) and Charing Cross Hospital (London).

Population: Women with raised but falling serum human chorionic gonadotrophin (hCG) levels 6 months after evacuation of a molar pregnancy.

Methods: Retrospective case note review of eligible women identified by the electronic databases held at each supra-regional centre.

Main Outcome Measures: The proportion of women that attain normal hCG levels spontaneously without chemotherapy. In addition, rates of gestational trophoblastic neoplasia (GTN), drug resistance, disease relapse and overall survival are reported.

Results: Thirty-five women with molar pregnancy and raised but falling serum hCG levels continued surveillance 6 months after evacuation. Levels of hCG in 30 of the patients (86%) fell to normal levels spontaneously. One woman defaulted follow up prior to hCG normalisation (3%) and the remaining four women (11%) were treated with chemotherapy due to a plateau or rise in serum hCG levels indicating GTN. All treated women were successfully salvaged by either first (n = 1) or second line (n = 2) chemotherapy or found to have persistently raised low level hCG of uncertain clinical relevance (n = 1). No women developed relapsed disease and overall survival was 100%.

Conclusions: Women with a molar pregnancy and a raised but falling hCG level beyond 6 months from uterine evacuation can be safely observed with regular hCG monitoring and can usually avoid potentially toxic chemotherapy.

Tweetable Abstract: Women with treated molar pregnancy may avoid chemotherapy if 6-month hCG levels are raised but falling.