The population of ALDH1 high cells was more invasive, antiapoptotic, and tumorigenic than the population of ALDH1 low cells in HEC-1 endometrioid adenocarcinoma cell line, in which abundant ALDH high cells were detected by Aldefluor assay as compared to other endometrioid adenocarcinoma cell lines 37. This evidence concerns the gene ALDH1A1 and endometrioid adenocarcinoma.