MUC1 and breast cancer: Similarly, in vitro work by Bloushtain-Qimron et al.[48] reported that CD44+ progenitor-like cells of normal mammary epithelium were hypomethylated compared with luminal epithelial (CD24+ and MUC1+) and myoepithelial (CD10+) cells and that cell type-specific methylation patterns were conserved in breast cancer subtypes.