CXCR4 and infection: At 4 days after infection, proliferation (OD of MTS) was markedly lower in the Lenti-CXCR4-siRNA group than in the SW480 group (0.92±0.06 vs 1.38±0.04, P=0.0050) and NC group (0.92±0.06 vs 1.28±0.05, P=0.0256).