Treatment of Newly Diagnosed Patient's With Wilm's Tumor Requiring Abdominal Radiation Delivered With Proton Beam Irradiation

Participants will receive proton beam radiation therapy (PBRT) according to stage and surgical findings. Favorable Histology Stage I \& II and FH Stage III/IV Delayed Local Control with clear surgical margins and pathologically negative lymph nodes: Participants will undergo complete surgical resection at diagnosis or after 6-12 weeks of induction chemotherapy. PBRT will not be administered to the primary site in those with no evidence of spill, peritoneal involvement, lymph node (LN) involvement or microscopic residual in the abdomen. Systemic therapy will be delivered in a standard of care manner according to histology and stage. Stage III \& IV Adjuvant RT: Participants will undergo surgical resection at diagnosis or after 6-12 weeks of induction chemotherapy. Those with evidence of LN involvement, surgical margin involvement, local or diffuse spill, gross disease in the renal bed or peritoneal implants, will receive adjuvant PBRT. Systemic therapy will be delivered in a standard of care manner according to histology and stage. Stage V Adjuvant RT: Participants will undergo partial nephrectomy after 6-12 weeks of induction chemotherapy. Those with evidence of LN involvement, surgical margin involvement, local or diffuse spill, gross disease in the renal bed or peritoneal implants, will receive adjuvant PBRT. Systemic therapy will be delivered in a standard of care manner according to histology and stage. Systemic therapy will follow a well-defined standard of care based on Children's Oncology Group (COG) approaches including pre-operative chemotherapy and adjuvant chemotherapy. The intent will be to standardize chemotherapy to ensure a consistent background of standard of care therapy, while not mandating additional data collection beyond the specific trial objectives.