Assessment of the expression of other BCSC markers -ALDH1A1, EpCAM, CXCR4, and CD133 in stable NRF1 overexpressing CD44+CD24− and CD44+CD24+ subpopulations showed as many as 10 different downstream breast cancer progenitor cell subpopulations (Table 1). Here, ALDH1A1 is linked to breast carcinoma.