A 7.7‐fold increase in the frequency of CD44+/CD24–/ALDH+ cells was detected among DCIS‐SOX11 cells as compared with control cell populations; no significant change was detected in the frequency of CD44+/CD24+/ALDH+ cells (Figure 3G; supplementary material, Figure S4). This evidence concerns the gene CD44 and ductal breast carcinoma in situ.