CXCL12 and HIV infectious disease: Overall, our results did not show a significant association between SDF1 polymorphism and susceptibility to HIV infection in all four models (recessive model: pooled OR = 0.94, 95% Cl: 0.75–1.17, P = 0.237; homozygous model: pooled OR = 0.89, 95% Cl: 0.70–1.15.