 REGIMEN C FOXO1 FUSION NEGATIVE: Patients receive vincristine sulfate IV over 1 minute on day 1 of weeks 1-10 and 13-22, dactinomycin IV over 1-5 minutes on day 1 of weeks 1, 4, 7, 10, 13, 16, 19, and 22, cyclophosphamide IV over 60 minutes on day 1 of weeks 1, 4, 7, and 10. Patients undergo RT beginning at week 13 for 6 weeks. Treatment continues in the absence of disease progression or unacceptable toxicity. 