[Curative effects and influenced factors of primary chemotherapy with single-agent methotrexate on low-risk gestational trophoblastic neoplasia].

Objective: To evaluate the efficacy of primary chemotherapy with single-agent methotrexate (MTX) for low-risk gestational trophoblastic neoplasia and to analysis the influenced factors. Methods: We retrospectively reviewed 259 cases with low-risk gestational trophoblastic neoplasia whose primary chemotherapies were MTX 0.4 mg·kg(-1) (maximum 25 mg) daily for 5 days every other week. Patients' data between January 2001 and June 2015 was collected and the relationships of different factors to outcomes of chemotherapy were also evaluated. Results: 183 of the 259 patients (70.66%, 183/259) achieved complete primary remission and all patients achieved complete remission after salvage chemotherapy. Univariate analysis showed that FIGO score, serum level of HCG before treatment and interval months from previous pregnancy were significantly associated with outcome of chemotherapy (P=0.001, 0.018, 0.014 respectively). Logistic regression analysis showed that the FIGO score (OR=4.094) and antecedent pregnancy (OR=0.268) were two independent factors predictive for the outcome of chemotherapy. Conclusions: Primary chemotherapy with single-agent MTX may still be one of the options for patients with low risk GTN. The FIGO score and antecedent pregnancy are two independent risk factors of outcome of single-agent MTX chemotherapy.