Primary Objective: Demonstrate non-inferiority of ultra-hypofractionated (stereotactic body radiation therapy [SBRT]) compared to hypofractionated radiation therapy (RT) with a 10% non-inferiority margin (from 50% to 40%) in the rate of bladder-intact event-free survival (BI-EFS) at 3 years (corresponding to a hazard ratio < 1.32) Secondary Objectives: Compare the rates of urinary and bowel toxicity, patient-reported outcomes (PRO), event-free survival (EFS), metastasis-free survival (MFS), and overall survival (OS) between the two treatment arms. Compare and evaluate symptomatic adverse events and quality of life measures that are most meaningful to patients. Evaluate circulating tumor deoxyribonucleic acid (ctDNA) as a biomarker to determine whether it is predictive of disease recurrence and as a secondary outcome variable.
NRG-GU015: The Phase III Adaptive Radiation and Chemotherapy for Muscle Invasive Bladder Cancer Trial