Unlike ALDH3A2, aldehyde dehydrogenase 1 family member A1 (ALDH1A1), 1 family member B1 (ALDH1B1), and 3 family member A1 (ALDH3A1) expression levels are elevated in other malignant tumors and associated with poorer survival outcomes. This evidence concerns the gene ALDH1B1 and cancer.