CXCL12 and AIDS: For risks of infection, no evidences indicated SDF1 polymorphism was associated with the risk of HIV-1 infection in all genetic models (recessive model: OR = 0.94, 95% Cl: 0.75–1.17; homozygous model: OR = 0.89, 95% Cl: 0.70–1.15; heterozygous model: OR = 1.06, 95% Cl: 0.83–1.35; allele model: OR = 0.95, 95% Cl: 0.79–1.13), Furthermore, we failed to find an delayed AIDS progression except in some specific cohorts including MACS cohorts (RH = 0.38, 95% Cl: 0.17–0.59 for time to AIDS; RH = 0.27, 95% Cl: 0.07–0.46 for time to death at the study entry).