- Stratum 1 (stage I favorable histology (FH) Wilms' tumor, under 24 months of age, and tumor weight less than 550 g): After nephrectomy, patients receive regimen EE-4A comprising dactinomycin (DACT) IV weekly on weeks 0, 3, 6, 9, 12, 15, and 18 and vincristine (VCR) IV weekly on weeks 1-10, 12, 15, and 18.