University of Texas at Houston - MD Anderson Cancer Center, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Michigan at Ann Arbor, University of Texas at Houston - MD Anderson Cancer Center, University of Texas at Houston - Department of Radiation Oncology, University of Texas at Houston - Investigational Cancer Therapeutics, University of Texas at Houston - Department of Thoracic/Head and Neck Medical Oncology, University of Texas at Houston - MD Anderson Cancer Center, affiliation not provided to SSRN, University of Texas at Houston - MD Anderson Cancer Center, University of Texas at Houston - Department of Radiation Oncology, University of Texas at Houston - MD Anderson Cancer Center, Stanford University - Department of Radiation Oncology, University of Texas at Houston - MD Anderson Cancer Center, University of Texas at Houston - MD Anderson Cancer Center and University of Texas at Houston - Department of Pulmonary Medicine