Aldehyde dehydrogenase 1 is a putative marker for cancer stem cells in head and neck squamous cancer

Yu Chih Chen, Yi Wei Chen, Han Shui Hsu, Ling Ming Tseng, Pin I. Huang, Kai Hsi Lu, Dow Tien Chen, Lung Kuo Tai, Ming Chi Yung, Shih Ching Chang, Hung Hai Ku, Shih Hwa Chiou, Wen Liang Lo