Furthermore, expression analysis of GSE20711 including a total of 45 luminal and 22 basal-like breast tumor cases was also interrogated to evaluate the mRNA levels of DACH1 and CD44 in luminal and basal-like breast neoplasm tissues, which showed that DACH1 was enriched in luminal breast carcinoma in comparison with basal-like breast cancer (P < 0.001) (Fig. 2b), while CD44 exhibited an opposite tendency (P < 0.001) (Fig. 2c) at mRNA level. Here, CD44 is linked to breast cancer.