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27 February 2015 : Meta-Analysis  

Association between TLR4 A299G Polymorphism and Pneumonia Risk: A Meta-Analysis

Xingjun CaiABCDEF, Yihui FuBCDF, Qingyun ChenCD

DOI: 10.12659/MSM.892557

Med Sci Monit 2015; 21:625-629

Abstract

BACKGROUND: Several genetic studies have evaluated the association between Toll-like receptor 4 (TLR4) A299G polymorphism and the risk of pneumonia. However, the results were not consistent. We thus did this meta-analysis.

MATERIAL AND METHODS: Relevant studies were systematically searched by using the NCBI, Medline, Web of Science, and Embase databases. Data were extracted independently by 2 investigators. Odds ratios (ORs) and corresponding 95% confidence intervals (CIs) were estimated.

RESULTS: Eight case-control studies with 658 patients and 1862 controls were included in this meta-analysis. TLR4 A299G polymorphism was significantly associated with pneumonia risk (OR=1.74; 95% CI 1.19–2.53; P=0.004). The result was significant in adults. In addition, TLR4 A299G polymorphism was also associated with community-acquired pneumonia (CAP) risk. Results from cumulative meta-analysis and sensitivity analysis suggested that the results are reliable and robust.

CONCLUSIONS: The results of this meta-analysis suggest that susceptibility to pneumonia was associated with TLR4 A299G polymorphism.

Keywords: Genetic Association Studies, Child, Preschool, Genetic Predisposition to Disease, Polymorphism, Single Nucleotide - genetics, Risk Factors, Toll-Like Receptor 4 - genetics

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750