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To evaluate the results of etoposide, methotrexate, and dactinomycin alternating with cyclophosphamide and vincristine (EMA/CO) chemotherapy in women with high-risk gestational trophoblastic tumors (GTT) and to document the middle- and long-term toxicity of the regimen.

A total of 272 consecutive women with high-risk GTT, including 121 previously treated patients, were treated with weekly EMA/CO. The median follow-up duration is 4.5 years (range, 1 to 16).

The cumulative 5-year survival rate is 86.2% (95% confidence interval, 81.9% to 90.5%). No deaths from GTT have occurred later than 2 years after the end [corrected] of EMA/CO. In a multivariate model, adverse prognostic factors were the presence of liver metastases (P < .0001), interval from antecedent pregnancy (P < .0001), brain metastases (P = .0008), and term delivery of antecedent pregnancy (P …