The experimental results showed that: after CXCL12 gene silencing, compared with the untransfected and control siRNA groups and positive control β-actin (shown in Fig. 2a), the expressions of CXCL12 proteins in four colon cancer cells were significantly inhibited (P < 0.01, respectively, compared with the untransfected and control siRNA groups), and the experiment showed that CXCL12 siRNA primer design and cell transfection were successful (as shown in Fig. 2b). The gene discussed is CXCL12; the disease is colonic neoplasm.