Lei Zhang1, Jingru Tian2, Changli Wang3. 1. Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Lung Cancer Center, Department of Thoracic Surgery, Tianjin, China. 2. Xiangya School of Medicine, Central South University, Changsha, China. 3. Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, Tianjin Lung Cancer Center, Department of Thoracic Surgery, Tianjin, China. Electronic address: raymd728@qq.com.