To investigate whether there is a positive correlation between Bmi-1, Snail, and ALDH1 in head and neck cancers, we studied the expression of Bmi-1, Snail, and ALDH1 by immunohistochemical (IHC) staining of a panel of specimens array from 93 HNSCC patients. Here, ALDH1A1 is linked to head and neck cancer.