Etoposide and cisplatin/etoposide, methotrexate and actinomycin D (EMA) chemotherapy for patients with high-risk gestational trophoblastic tumors refractory to EMA/cyclophosphamide and vincristine chemotherapy and patients representing with metastatic placental site trophoblastic tumors. - Newlands,E.S.; Mulholland,P.J.; Holden,L.; Seckl,M.J.; Rustin,G.J. (J Clin Oncol, 2000)