Cytokine gene polymorphisms are associated with irritable bowel syndrome: a systematic review and meta‐analysis

Background  Low‐grade inflammation has been increasingly implicated in the pathophysiology of irritable bowel syndrome (IBS). Imbalances of pro‐ and anti‐inflammatory cytokines and polymorphisms in cytokine genes have been reported in IBS; however, these findings have not been consistently observed. This may be due to small sample sizes and differences in ethnicities. Therefore, we performed a meta‐analysis on the studies that investigated cytokine gene polymorphisms in IBS patients compared to healthy controls.

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