cancer stem cells. However, our knowledge of the expression and activity of ALDH1 in
common epithelial cancers and their corresponding normal tissues is still largely absent.
Therefore, we characterized ALDH1 expression in 24 types of normal tissues and a large
collection of epithelial tumor specimens (six cancer types, n= 792) by immunohistochemical
staining. Using the ALDEFUOR assay, ALDH1 activity was also examined in 16 primary …