Adaptive Radiation Planning for the Reduction of Radiation-Induced Toxicity in Patients With Stage II-IV Non-small Cell Lung Cancer

This phase II trial studies the effect of adaptive radiation planning in reducing side effects associated with radiation treatment and immunotherapy in patients with stage II-IV non-small cell lung cancer. Prior to radiation, patients undergo simulation, where they are positioned on the treatment table in a manner that can be reproduced each time they receive treatment in order to reach the tumor exactly at the same spot each time. However, a patient's tumor may shrink as they receive radiation, exposing healthy tissue to radiation as well. Adaptive radiation planning involves re-designing a treatment plan at set intervals. The purpose of this study is to see whether establishing set time points through adaptive radiation planning, regardless of whether the doctor notices a significant decrease in tumor size, will reduce some of the side effects associated with radiation treatment and immunotherapy.