ALDH1A1 and breast carcinoma: studied 15 breast cancer cell lines (BT-474, BT-483, BT-20, MDA-MB-468, SKBR-3, MDA-MB-231, MDA-MB-436, MDA-MB-453, MDA-MB-157, MCF7, T47D, BT-549, ZR75-1, HCC202, and HCC1428) and found that the mean ALDEFLUOR-positive rate was 3.5% and positively correlated with ALDH1A1 protein expression.88