Association between (, , , , and ) and risk of psoriasis in studies following Hardy-Weinberg equilibrium: A systematic review and meta-analysis.

Objective: Psoriasis is a disease with an immunogenetic background in which cytokines have important effects on its prevalence and incidence. The present meta-analysis evaluated the relationship between () polymorphisms (, , , , and ) and psoriasis risk in studies following Hardy-Weinberg equilibrium (HWE).

Materials And Methods: Four databases were searched to retrieve relevant studies reporting the distributions of polymorphisms in psoriasis cases compared to controls. The effect sizes were the 95% confidence intervals (CIs) and odds ratios (ORs). Subgroup analysis, sensitivity analyses, publication bias, trial sequential analysis (TSA), and meta-regression were performed on the initial pooled results of polymorphisms.

Results: Thirty-six articles with 71 studies were included in the meta-analysis (twenty-six: 361525, twenty-seven: 1800629, nine: 1799724, four: , and five: 1799964). The pooled ORs for -238 G/A 361525 polymorphism were 2.33 ( < 0.00001), 2.79 ( < 0.0001), 2.35 ( < 0.00001), 2.44 ( < 0.00001), and 2.45 ( < 0.00001), as well as 1.57 ( < 0.00001), 1.98 ( = 0.01), 1.61 ( < 0.00001), 1.64 ( < 0.00001), and 1.79 ( < 0.00001) for -857 C/T 1799724 polymorphism in allelic, homozygous, heterozygous, dominant, and recessive models, respectively. Ethnicity, psoriasis type, and sample size affected the pooled results of 361525, 1800629, and 1799724 polymorphisms. Based on TSA, there were just sufficient cases for -238 G/A 361525 polymorphism in five genetic models and -857C/T 1799724 polymorphism in allelic, heterozygous, and dominant models.

Conclusions: The A allele and GA and GG genotypes of -238 G/A 361525 polymorphism and T allele, TT and CT genotypes of -857C/T 1799724 polymorphism were related to increased risks in psoriasis cases. Well-designed studies (with no deviation from HWE in controls) with more cases are recommended in the future.