We further demonstrated that increased neutrophils, both in percentage and absolute number, positively correlated with increased CXCL12, the ligand for CXCR4, in GC tumors (Figure 3B), and that the concentrations of CXCL12 in tumor tissues or tumor tissue culture supernatants (TTCS) were significantly increased when compared to those in non‐tumor tissues or non‐tumor tissue culture supernatants (NTCS) (Figure 3C). This evidence concerns the gene CXCL12 and gastric cancer.