Vincristine, Dactinomycin, and Doxorubicin With or Without Radiation Therapy or Observation Only in Treating Younger Patients Who Are Undergoing Surgery for Newly Diagnosed Stage I, Stage II, or Stage III Wilms' Tumor

Inclusion Criteria: * Histologically confirmed Wilms' tumor * Newly diagnosed stage I-III disease * Favorable histology * No moderate- or high-risk Wilms' predisposition syndromes * Must meet 1 of the following disease stratification categories: * Very low-risk disease * Stage I disease * Age \< 2 years * Tumor weight \< 550 g * Regional lymph nodes histologically negative (must have been sampled) * No pulmonary metastases on CT scan of chest * No synchronous bilateral Wilms tumors (Stage V) * Not predisposed to develop bilateral Wilms tumors, defined as unilateral Wilms tumor and any of the following: * Aniridia * Beckwith-Wiedemann syndrome * Simpson-Golabi-Behmel syndrome * Denys-Drash syndrome or other associated genito-urinary anomalies * Multicentric WT or unilateral WT with contralateral nephrogenic rest(s) in a child \< 1 year of age * Diffuse hyperplastic perilobar nephroblastomatosis * Standard-risk disease meeting 1 of the following criteria: * Disease does not require radiotherapy * LOH at chromosomes 1p and 16q for stage I or II * Stage I disease meeting 1 of the following criteria: * Age ≥ 2 years to age \< 30 years * Tumor weight ≥ 500 g * Stage II disease * Age \< 30 years * Any tumor weight * Disease requires radiotherapy * No LOH at chromosomes 1p and 16q\* * Stage III disease * Must be enrolled on protocol C…