ALDH1A1 and cancer: Because of the paradoxical and conflicting results of ALDH1 and CD56 expression in different neoplasms and the lack of an accurate assessment of them in salivary gland tumors, we aimed to assess the ALDH1 and CD56 expression in common benign and malignant salivary gland tumors, as well as their relation with each other and with a number of clinicopathologic factors.