As shown in a recent study by Shima et al. 21, high H19 expression is associated with the stem cell phenotype in ALDH1-positive breast cancer, and H19 is associated with several genes such as miR-103, miR-107, let-7, miR-29b-1, and Trx, which are reported to regulate CSCs. Here, ALDH1A1 is linked to breast cancer.