They are including of stellar, rex-1, nestin, and H19, β-catenin, OCT4, NANOG, and SOX2.18,19 During carcinogenesis, these factors reprogram differentiated tumor cells into undifferentiated stem-like cells.14 Breast cancer CD44+ cells are like to normal stem cells and they show basal-like cells properties. Here, CD44 is linked to breast cancer.