1 Institute of Cancer Stem Cell, DaLian Medical University, Dalian, Liaoning, China.
2 Department of Stem Cell and Regenerative Medicine, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China. yushicang@163.com.
3 Institute of Cancer Stem Cell, DaLian Medical University, Dalian, Liaoning, China. yangqingkai@dmu.edu.cn.