We recently identified in triple negative breast cancer, an aggressive breast cancer subtype that disproportionately affects African American women (Brewster et al., 2014), that expression of epigenetic reader methyl binding domain protein 2 (MBD2), specifically the alternative mRNA splicing variant MBD2_v2, is dependent on reactive oxygen species (ROS) and necessary to maintain the cancer stem cell phenotype (Bao et al., 2017). This evidence concerns the gene MBD2 and breast cancer.