Department of Internal Medical Oncology, Harbin Medical University Cancer Hospital, Harbin 150081, China. Public Health School of Qiqihar Medical University, Qiqihar 161000, China. Department of Clinical Cancer Prevention, The University of Texax MD Anderson Cancer Center, Houston, TX 77290, USA. Department of Medicine, Brown University, 02912, USA. Department of Internal Medical Oncology, Harbin Medical University Cancer Hospital, Harbin 150081, China. Electronic address: panghui@hebmu.edu.cn. Department of Internal Medical Oncology, Harbin Medical University Cancer Hospital, Harbin 150081, China. Electronic address: caili@ems.hrbmu.edu.cn.