RESUMEN
OBJECTIVES: To assess and synthesize the current evidence on the association of interleukin-6 (IL-6)-572 G/C, IL-6-597 G/A, and IL-6-174 G/C polymorphisms and risk of lumbar degenerative disease (LDD). PATIENTS AND METHODS: Five electronic databases including PubMed, EMBASE, Web of Science, CNKI and Wanfang were systematically searched for potential studies previous to August 10, 2018. Summary odds ratio (OR) and corresponding 95% confidence interval (95%CI) were calculated to evaluate the association. RESULTS: Nine case-control studies comprising 1519 cases and 1887 controls were obtained for the meta-analysis. For IL-6-572 G/C, IL-6-597 G/A, and IL-6-174 G/C polymorphisms, there were seven, six, and seven studies eventually included in the meta-analysis respectively. The findings indicated that the three polymorphisms had significant associations with risk of LDD: for IL-6-572 G/C, G vs. C, OR = 1.37, 95%CI 1.11-1.69, P = 0.004; for IL-6-597 G/A, G vs. A, OR = 1.38, 95 %CI 1.16-1.65, P = 0.000; for IL-6-174 G/C, G vs. C, OR = 1.63, 95%CI 1.15-2.29, P = 0.006. CONCLUSION: The present meta-analysis found IL-6-572 G/C, IL-6-597 G/A, and IL-6-174 G/C polymorphisms were significantly associated with increased risk of LDD susceptibility.