CD44 and neoplasm: In comparison, for the group that was injected with the 5 × 104 CD44+ CD117+CSCs with the miR-200c overexpression, only 3 out of the 6 mice with equal injection of 5 × 104 cells developed tumors after 56 days into the observation; the tumor sizes of these 3 mice were also smaller than those of the control group mice.