Main idea: The major findings of this meta-analysis suggested that IL-8 rs4073 polymorphism is significantly associated with risk of prostate cancer.
Background/purpose: Interleukin-8 (IL-8) is an inflammatory cytokine and plays important role in development of cancers. We conducted a meta-analysis to explore the association between IL-8 rs4073 polymorphism and risk of prostate cancer.
Methods: PubMed, Embase, Cochrane Library, and Web of Science databases were searched for only case-control studies published before February 2019. The methodological quality assessment of included studies was performed based on Newcastle-Ottawa Quality Scale (NOS). Based on the heterogeneity, we conducted a meta-analysis using random-effect models. Pooled odds ratios (ORs) with a 95% confidence interval (CI) were calculated using the allele (T vs. A), homozygous (TT vs. AA), heterozygous (TA vs. AA), dominant (TT + TA vs. AA), and recessive (TT vs. TA + AA) genetic models to assess the strength of the relationship between IL-8 rs4073 polymorphism and prostate cancer risk. In addition, the stability of our analysis was evaluated by heterogeneity, sensitivity, subgroup of ethnicity and study design, and publication bias analysis.
Results: We included 6 case-control studies with a total of 1752 cases and 1982 controls. Significantly higher prostate cancer risk of 1.12 (95% CI = 1.01-1.25), 1.26 (95% CI = 1.03-1.55), and 1.20 (95% CI = 1.02-1.41) were found for the allele, homogeneous, and recessive model, respectively. Though there was no statistical association with other genetic models in our meta-analyses, a tendency of higher prostate cancer risk was observed in all five genetic models.