The association between three promoter polymorphisms of IL-1 and stroke: A meta-analysis

• Association between IL-1 gene polymorphism and stroke risk
• It is about three promoters of IL-1 gene.
• It shows that IL-1α-889C/T polymorphism is associated with stroke risk, especially in Asians.

AimThe association between Interleukin-1 (IL-1) gene polymorphism and stroke remains controversial. The present study was designed to clarify this relationship through a pooled analysis of the numerous epidemiological studies focusing on this association.MethodsPublished data addressing the association between polymorphism of the IL-1 gene and stroke were selected from electronic databases. A total of 21 studies from 19 publications including 5280 stroke patients and 5699 controls were included in this meta-analysis which detect whether IL-1α-889C/T, IL-1β-511C/T and IL-1 RN polymorphism were associated with stroke susceptibility.ResultThe combined results of overall analysis revealed that there was a significant association between IL-1α-889C/T polymorphism and stroke (allele model: OR = 1.39, 95% CI = 1.14–1.68, P < 0.001; recessive model: OR = 1.56, 95% CI = 1.27–1.90, P < 0.001; dominant model: OR = 1.45, 95% CI = 1.13–1.87, P = 0.004; additive model: OR = 1.70, 95% CI = 1.37–2.10, P < 0.001). On a subgroup analysis by ethnicity of study population, significant association was found in Asians (allele model: OR = 1.25 95% CI = 1.12–1.39, P < 0.001; recessive model: OR = 1.36, 95% CI = 1.09–1.69, P = 0.007; dominant model: OR = 1.29, 95% CI = 1.12–1.48, P < 0.001; additive model: OR = 1.42, 95% CI = 1.13–1.80, P = 0.003). There are no associations of IL-1β-511C/T and IL-RN polymorphisms on stroke risk were identified.ConclusionIn conclusion, our results suggested that IL-1α-889C/T polymorphism is associated with stroke risk, especially in Asians. However, no associations of IL-1β-511C/T and IL-RN polymorphisms on stroke risk in overall analysis or subgroup analysis.