When 1,000 cells were inoculated 0/8 for CD133−CXCR4− formed tumor, 1/8 for CD133+CXCR4−, and 5/8 and 8/8 in cells respectively CD133−CXCR4+ and CD133+CXCR4+. This evidence concerns the gene CXCR4 and neoplasm.