The mice injected with the 5 × 104 CD44+CD117+CSCs with lentivirus miR-200c showed much higher tumor free rates than the mice injected with the 5 × 104 CD44+CD117+CSCs with lentivirus mock or 5 × 104 CD44+CD117+CSCs without lentivirus infection on different days after the injection. The gene discussed is KIT; the disease is neoplasm.