In this meta-analysis, we aimed to clarify the impact of Janus kinase 2 (JAK2) rs10758669 polymorphisms on ulcerative colitis (UC) and Crohn's disease (CD) risk. Data were extracted, and pooled odd ratios (ORs) as well as 95% confidence intervals (95%CIs) were calculated. Eleven studies with 7009 CD patients, 7929 UC patients, and 19235 controls were included. The results showed that JAK2 rs10758669 polymorphism was associated with CD (AC vs. AA, OR = 1.16, 95%CI, 1.08-1.24; CC vs. AA, OR = 1.29, 95%CI, 1.17-1.43; AC + CC vs. AA, OR = 1.19, 95%CI, 1.11-1.27; CC vs. AA + AC, OR = 1.19, 95%CI, 1.09-1.31; C vs. A, OR = 1.14, 95%CI, 1.09-1.20) and UC susceptibility (AC vs. AA, OR = 1.14, 95%CI, 1.06-1.22; CC vs. AA, OR = 1.33, 95%CI, 1.20-1.47; AC + CC vs. AA, OR = 1.18, 95%CI, 1.10-1.27; CC vs. AA + AC, OR = 1.24, 95%CI, 1.12-1.36; C vs. A, OR = 1.15, 95%CI, 1.10-1.21). But no significant association was found between JAK2 rs10758669 polymorphism with CD in Asian. Either in adult-onset group or multi-age group, hospital-based group or population-based group, JAK2 rs10758669 polymorphism was associated with CD and UC susceptibility. This meta-analysis indicated that JAK2 rs10758669 polymorphism was a risk factor both for CD and UC, especially in Caucasian. The differences in age of onset and study design did not influence the associations obviously. Gene-gene and gene-environment interactions should be investigated in the future.
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