Safety review will continue to occur on an ongoing basis. Should the rates of grade 3 treatment-related pulmonary toxicity (defined as pneumonitis), cardiac toxicity (defined as pericarditis) or gastrointestinal toxicity (defined as esophagitis, gastritis or enter colitis) be observed at a frequency greater than 15%, accrual will be halted and study will be re-evaluated. Should any patient have ≥ grade 4 treatment-related adverse effects, accrual will be halted and study will be re-evaluated Follow-up Routine surveillance computerized axial tomography (CT) imaging of the chest, abdomen, and pelvis will be performed starting at 12 weeks after completion of radiation in both treatment groups to allow for primary endpoint assessment. Routine CT imaging surveillance will continue per standard of care. Patients will also be followed clinically with history and physical examinations, vitals signs, and laboratory examinations as indicated.