CD44 and breast cancer: While, some studies reported that CD44+/CD24−/low and ALDH1 + are more enriched in TNBC tumor tissues compared with the other breast cancer subtypes.32, 33 The CD44+/CD24−/low CSC ratio was an independent prognostic factor and may serve as a potential predictive marker for chemotherapy in breast cancer.34 Our observation coincides with the results of mentioned above.