1 Key Laboratory of Carcinogenesis and Invasion, Chinese Ministry of Education, Xiangya Hospital, Central South University, Changsha, China.
2 Cancer Research Institute, Xiangya School of Medicine, Central South University, Changsha, China.
3 Key Laboratory of Carcinogenesis, Chinese Ministry of Health, Changsha, China.
4 Hunan Cancer Hospital, Changsha, China; and.
5 The Hormel Institute, University of Minnesota, Austin, Minnesota, USA.
6 Key Laboratory of Carcinogenesis and Invasion, Chinese Ministry of Education, Xiangya Hospital, Central South University, Changsha, China; ycao98@vip.sina.com.