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Relative efficacy and toxicity of cyclophosphamide compared with ifosfamide are debatable. The Euro-EWING99-R1 trial asked whether cyclophosphamide may replace ifosfamide in combination with vincristine and dactinomycin (vincristine, dactinomycin, and cyclophosphamide [VAC] v vincristine, dactinomycin, and ifosfamide [VAI]) after an intensive induction chemotherapy containing vincristine, ifosfami
