3D Conformal Radiation Therapy after Surgery in Treating Patients with High-Risk Bladder Cancer

Inclusion Criteria

• Pathologic diagnosis of urothelial or squamous cell carcinoma of the bladder
• Patients must have undergone cystectomy (total cystectomy, radical cystectomy +/- pelvic lymph node dissection) with no evidence of macroscopic residual disease
• Eastern Cooperative Oncology Group (ECOG)/Zubrod performance status of 0-2
• Patients treated with simple cystectomy with macroscopically negative margins are eligible for this study
• Clinical T-stage (prior to systemic therapy, if applicable) >= T3a and/or positive lymph nodes by transurethral resection of bladder tumor (TURBT)/magnetic resonance imaging (MRI)/computed tomography (CT)/positron emission tomography (PET)-CT or
• Pathologic T-stage >= T3a and/or positive lymph nodes

Exclusion Criteria

• Patients with metastatic disease outside of the pelvis
• Prior invasive malignancy (except non-melanomatous skin cancer) unless disease free for a minimum of 3 years
• Prior radiation therapy to the pelvis
• Patients with active inflammatory bowel disease
• Severe acute co-morbidity, defined as follows: * Unstable angina and/or congestive heart failure requiring hospitalization in the last 3 months * Transmural myocardial infarction within the last 6 months * Acute bacterial or fungal infection requiring intravenous antibiotics at the time of registration * Chronic obstructive pulmonary disease exacerbation or other respiratory illness requiring hospitalization or precluding study therapy at the time of registration * Acquired immune deficiency syndrome (AIDS) based upon current Centers for Disease Control and Prevention (CDC) definition; note, however, that human immunodeficiency virus (HIV) testing is not required for entry into this protocol; protocol-specific requirements may also exclude immunocompromised patients