ALDH1A1 and colonic neoplasm: In this study, the expression levels of CSC markers aldehyde dehydrogenase 1 (ALDH1) and ATP-binding cassette super-family G member 2 (ABCG2) were determined in Iraqi patients with colon cancer, and the association between the expression levels of these markers and tumor stages, lymph node involvement, patient's age and gender were examined.