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Endoplasmic reticulum aminopeptidase 2  ( ERAP2)  gene is reported to be associated with inflammation-related diseases. Several studies have investigated the associations of  ERAP2  gene polymorphisms and susceptibility to ankylosing spondylitis (AS). However, the findings of those studies were inconsistent. The aim of this study was to elucidate the associations by a meta-analysis with trial sequential analysis (TSA). Online databases of PubMed, Web of Science, EMBASE, Cochrane Library, Wanfang, and CNKI were searched to identify eligible studies on the associations of  ERAP2  gene polymorphisms and AS. Study quality was judged based on the Newcastle-Ottawa scale (NOS). Strengths of associations were presented by  P -value, odds ratios (ORs), and 95% confidence intervals (95%CIs). TSA was employed to evaluate the information size and statistical power. A total of six studies encompassing 2774 AS patients and 4119 disease-free controls were eligible for this meta-analysis. Five studies reported  rs2248374  polymorphism and three studies reported  rs2549782  polymorphism. The pooled data suggested that the two polymorphisms were not significantly associated with AS susceptibility:  rs2248374 , A vs. G, OR = 0.94, 95%CI 0.86–1.02,  P  = .14;  rs2549782 , T vs. G, OR = 1.03, 95%CI 0.95–1.12,  P  = .45. TSA indicated that the sample sizes appeared to be inadequate to obtain a positive outcome. The present findings of this study do not support any evidence on the associations of  rs2248374  and  rs2549782  polymorphisms in  the ERAP2  gene and susceptibility to AS. Additional well-designed and large-sample studies in diverse ethnicities are encouraged to validate the current findings.

immunological investigations

Lack of Associations between  Endoplasmic Reticulum Aminopeptidase 2  Gene Polymorphisms and Ankylosing Spondylitis: A Meta-analysis with Trial Sequential Analysis