Xiu-Yi Zhi1, Jin-Ming Yu2, Yuan-Kai Shi3. 1. Department of Thoracic Surgery, Beijing Xuanwu Hospital, Capital Medical University, Beijing, China. 2. Department of Radiation Therapy, Shandong Cancer Hospital, Shandong, China. 3. Department of Medical Oncology, Cancer Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.