CD44 and neoplasm: We systematically compared the profiles of the three states of BCSCs (ALDH<sup>+</sup>CD24<sup>-</sup>CD44<sup>+</sup>, ALDH<sup>+</sup>non-CD24<sup>-</sup>CD44<sup>+</sup> and ALDH<sup>-</sup>CD24<sup>-</sup>CD44<sup>+</sup>) to that of the differentiated tumor cells (ALDH<sup>-</sup>non-CD24<sup>-</sup>CD44<sup>+</sup>).