This study was performed by Qingfeng Zhang, Kai Yu, Shihua Li, Xiaolong Zhang, Qi Zhao, Xia Zhao, Zekun Liu, Han Cheng, Ze-Xian Liu and Xiaoxing Li

Qingfeng Zhang, Kai Yu, Xiaolong Zhang, Qi Zhao, Xia Zhao, Zekun Liu and Ze-Xian Liu are from

Sun Yat-sen University Cancer Center,

Building 2#20F, 651 Dongfeng East Road,

Guangzhou 510060, P. R. China

Xiaoxing Li is from

First Affiliated Hospital, Sun Yat-sen University,

58 Zhongshan 2nd Road,

Guangzhou 510080, P. R. China

Shihua Li and Han Cheng are from

College of Life Science, Zhengzhou University,

100 Science Avenue,

Zhengzhou 450000, P. R. China

Email: liuzx AT sysucc.org.cn

Tel/Fax: +86-20-87342025

Email: lixiaox23 AT mail.sysu.edu.cn

Tel/Fax: +86-20-87342283