Cancer stem cell‐like characteristics and telomerase activity of the nasopharyngeal carcinoma radioresistant cell line CNE‐2R oleh Kai‐Hua Chen, Ya Guo, Ling Li, Song Qu, Wei Zhao, Qi‐Teng Lu, Qi‐Yan Mo, Bin‐Bin Yu, Lei Zhou, Guo‐Xiang Lin, Yong‐Chu Sun, Xiao‐Dong Zhu