However, the tumor volumes were significantly increased in RT-R-MDA-MB-231 cell-injected mice compared to MDA-MB-231 cell-injected mice, and CD24−/low/CD44+ cell-injected mice showed even greater enhancement of tumor growth than RT-R-MDA-MB-231 cell-injected mice (Figure 5A,B). This evidence concerns the gene CD24 and neoplasm.