Association between the Lymphotoxin- A252g Gene Polymorphism and the Risk of Sepsis and Mortality: A Meta-Analysis

Background. The association between the lymphotoxin-alpha(LTA) A252G polymorphism and sepsis risk has been extensively studied, but the results have been controversial. This study is aimed at investigating the overall association between the LTAA252G polymorphism and the risk of sepsis/septic shock and sepsis-related mortality. Methods. We searched the PubMed and EMBASE databases to identify studies that investigated the association between the LTA A252G polymorphism and risks of sepsis, septic shock, and mortality. The relevant data were extracted, and statistical analyses were performed using the Revman 5.0 and STATA 12 software. Results. A total of 32 publications were included in the meta-analysis. The results demonstrated that the LTAA252G polymorphism showed no significant association with sepsis risk (GG+GAvs.AA:OR=0.92,95%CI=0.79-1.07,p=0.27) or with sepsis shock risk (GG+GAvs.AA:OR=1.01,95%CI=0.84-1.22,p=0.91). However, in the subgroup analyzed by ethnicity, theLTAA252G polymorphism significantly decreased sepsis risk in the Asian population for the recessive model [GGvs.GA+AA:OR=0.82,95%CI=0.68-0.99,p=0.04] but not in the Caucasian population. Moreover, comparisons between sepsis patients who survived and those who did not suggested that theLTAA252G polymorphism decreases the risk of mortality [GG+GA vs. AA:OR=0.57,95%CI=0.41-0.80,p<0.01].Conclusion. Our results suggested that the A252G polymorphism in theLTAgene decreased the risk of sepsis in Asians and may reduce mortality in septic individuals.