Concurrently, the relative analysis revealed that the expressive level of preoperative CD133 mRNA in the PBMCs related positively to the expressive level of CD133 mRNA in the primary lesion of GC (r = 0.310, P = 0.009) (Figure 1(a)), indicating that the increased level of CD133 mRNA in the PBMCs before operation was positively corresponding to the higher level of CD133 mRNA in primary lesion of GC. This evidence concerns the gene PROM1 and gastric cancer.