• Felicia Elena Buruiana, Ivan Solà, and Pablo Alonso-Coello.
• Core Surgical Training 1, Princess Alexandra Hospital, Harlow, UK.
• Cochrane Db Syst Rev. 2010 Nov 10 (11): CD005109.

BackgroundThe etiology of Crohn's disease remains unknown, nevertheless, it is apparent that inflammation is associated with an imbalance between proinflammatory and anti-inflammatory cytokines produced within the intestinal mucosa. Crohn's disease represents a state of dysregulated inflammation and drugs that can augment the anti-inflammatory response have the potential to downregulate inflammation and thereby improve the disease. The efficacy of recombinant IL-10 in Crohn's disease was first demonstrated in a pilot study. Since then other trials have evaluated its efficacy but the available evidence has not been systematically reviewed.ObjectivesTo determine the efficacy and tolerability of recombinant human interleukin 10 (IL-10) for induction of remission in Crohn's disease.Search StrategyA computer assisted search of the Cochrane Central Register of Controlled Trials and the Cochrane IBD/FBD Review Group Specialized Trials Register and the on-line databases MEDLINE and EMBASE was performed to identify relevant publications up to September 2010. Reference lists were searched and the pharmaceutical industry and experts were contacted to identify additional studies.Selection CriteriaRandomized controlled trials comparing recombinant human interleukin 10 to a placebo or control therapy for the treatment of patients with active Crohn's disease were included.Data Collection And AnalysisAll publications identified by the search strategy were assessed independently by two authors, and relevant studies selected according to the inclusion criteria. The risk of bias of each included study was assessed independently by two authors. Data were analyzed using Review Manager (RevMan 5). A random effects model was used for pooling of data. All data were analyzed on an intention-to-treat basis. Heterogeneity among studies was assessed using the chi-square test and the I(2) statistic.Main ResultsThe risk of bias in the included studies was low. The overall quality of the evidence based on the GRADE approach was moderate. No statistically significant differences were found between interleukin 10 and placebo for complete remission (CDAI < 150 with a 100 point decrease in CDAI from baseline; RR=1.43; 95% CI 0.62 to 3.29; I(2)=40%) or clinical remission (CDAI < 150; RR=1.29; 95% CI 0.79 to 2.11; I(2)= 0%). Patients treated with interleukin 10 were significantly more likely to withdraw from the studies due to adverse events (RR=13.50; 95% CI 3.89 to 46.79; I(2)=0%).Authors' ConclusionsInterleukin 10 does not appear to provide any benefit for the treatment of active Crohn's disease. This systematic review shows that interleukin 10 does not increase the number of remissions (complete or clinical), but increases the rate of withdrawal due to adverse events relative to placebo. The quality of the evidence regarding the efficacy of IL-10 is moderate and although further research may have an impact on point estimates of efficacy further randomized trials are unlikely to be undertaken.

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