Xinlan Fan, Xu Chen, Weixi Deng, Guangzheng Zhong, Qingqing Cai* and Tianxin Lin*
* Corresponding authors: Qingqing Cai caiqingqing199@hotmail.com - Tianxin Lin tianxinl@sina.com
BMC Cancer 2013, 13:61 doi:10.1186/1471-2407-13-61