Personalized Accelerated ChEmoRadiation (PACER) for Lung Cancer

Inclusion Criteria: * Histologically or cytologically documented malignancy of the lung including non-small cell lung cancer or small cell lung cancer planned for definitive therapy with fractionated radiation (60-66 Gy) and concurrent systemic therapy * ECOG performance status of 0-2 * Age ≥ 18 years old * Ability to understand and the willingness to personally sign the written IRB approved informed consent document * Estimated life expectancy of 12 weeks or longer Exclusion Criteria: * Contraindication to receiving radiotherapy or systemic therapy as determined by treating radiation and medical oncologist * Age \< 18 years old * Tumor directly invading the major pulmonary arteries, aorta, heart or proximal bronchial tree * Diagnosis of interstitial pulmonary fibrosis * Previous radiation therapy to the thorax that would result in overlapping high dose radiation fields