The ERAP1 (rs26653) polymorphism was found to increase the disease risk in patients with AS and IBD compared with the control group (p=0.02 and p=0.01, respectively).
Overall, six SNPs were associated with AS; two SNPs (rs27044 and rs26653) were not when all studies were pooled into the meta-analysis (rs27044 G vs. C, OR = 1.058, 95% CI = 0.827-1.354; rs26653 C vs. G, OR = 1.154, 95% CI = 0.937-1.422).