This collection contains data from the Children’s Oncology Group (COG) Clinical Trial NCT00379340, “Combination Chemotherapy and Surgery in Treating Young Patients With Wilms Tumor, " Study Chair: Elizabeth Mullen, MD. It was sponsored by NCI and performed by the Children's Oncology Group under study number AREN0533. This phase III trial studies how well combination chemotherapy and surgery work in treating young patients with Wilms tumor. Select patient-level clinical data from this trial is available via the following link: https://nctn-data-archive.nci.nih.gov/node/738.

Primary Objectives

To determine whether delivery of proton beam radiation to a conformal reduced target volume in the flank allows normal flank growth compared to the contralateral untreated side and non-irradiated patients.

Secondary Objectives

To deliver proton beam radiation to a conformal reduced target volume (partial kidney proton beam radiation therapy) in the affected kidney(s) for patients with Stage V (bilateral Wilms tumor) and specific involved surgical margins yielding no reduction in the high control rates seen with more traditional flank / whole kidney fields.

Exploratory Objectives

• Study the feasibility of sparing the residual kidney, spine and liver in patients requiring whole abdomen radiation therapy using either a proton beam treatment technique or intensity-modulated radiation therapy ( IMRT) photon based technique.
• Study the feasibility of delivering whole lung radiation therapy with proton beams with the goals of sparing the developing breast tissue, heart structures, thyroid and liver.
• Develop simultaneous xenografts and organoid models from the same starting material to study Wilms tumor biology and compare responses to chemotherapeutic agents.
• Define the evolution of organ specific (kidney, liver, pancreas, etc.) abnormalities (laboratory studies) as an early marker of possible late end organ damage and their relationship to radiation.
• Study and evaluate impact of proton therapy on the musculoskeletal system and physical performance and compare with photon therapy cases treated with classical treatment fields.
• Assess CTC-AE and Pediatric Patient Reported Outcomes during radiation and in follow-up, correlating with disease, treatment and patient variables.
• Correlate quantitative MRI values, including apparent diffusion coefficient (ADC) values, with histopathology findings post-surgery in children with (bilateral) Wilms.
• Assess daily variations in proton range along each treatment beam using standard pre-treatment cone beam CT or on-treatment MR.