In addition, we found that the expression of discs large (DLG)-associated protein 5 (DLGAP5), which is known to increase stem-cell proliferation and be highly expressed in cancers [48,49,50,51], was also higher in MDA-MB-231 compared with MCF7 cells (Figure 1D), indicating that DLGAP5 may positively regulate BCSC proliferation. This evidence concerns the gene DLGAP5 and cancer.