1 Department of Thoracic and Cardiovascular Surgery, University of Texas M. D. Anderson Cancer Center, Houston, Texas.
2 Department of Thoracic/Head and Neck Medical Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas; Department of Cancer Biology, University of Texas M. D. Anderson Cancer Center, Houston, Texas.
3 Department of Thoracic/Head and Neck Medical Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas. Electronic address: xliu17@mdanderson.org.