P547 Safety and efficacy of vedolizumab in the treatment of patients with moderate to severe Ulcerative Colitis: a systematic review and meta-analysis

Abstract

Abstract Background To perform a systematic review and meta-analysis discussing the efficacy and safety of vedolizumab (VDZ) treatment in patients with active moderate to severe ulcerative colitis (UC). Methods Using relevant keywords, we searched PubMed, Web of Science, Scopus, and Cochrane Central databases, until June 2020. We included interventional and observational cohort studies which assessed the safety and effectiveness of VDZ 300 mg intravenous infusion, in patients with active moderate to severe UC. We used the Cochrane risk of bias assessment tool and the Newcastle-Ottawa scale to assess the quality of included interventional and cohort studies, respectively. Dichotomous outcomes were pooled as proportion, 95% Confidence interval (CI), and p-value under the random-effects model in the open meta-analyst software. Results We found 10 interventional studies and 35 cohort studies, including 4,794 patients eligible for our review. Most of the included citations were single-arm studies. Our meta-analysis showed that VDZ therapy could induce a significant clinical response in UC patients up to 54 weeks (proportion 0.516, 95% CI [0.453, 0.578], p < 0.001). VDZ was associated with clinically significantly clinical remission and steroid-free clinical remission after 54 weeks (p < 0.0001). Durable clinical remission, histological remission, and endoscopic response rates were maintained in UC patients taking VDZ at the 52nd week. There was no significant difference between VDZ and placebo regarding the incidence of drug-related serious adverse events (p = 0.113) and death rates (p = 0.085). Conclusion Our systematic review and meta-analysis showed that the use of VDZ in patients with active moderate to severe UC was associated with high percentages of clinical response and remission rates in induction and maintenance treatment stages. VDZ seems to be well tolerated in UC patients, apart from some infections and inflammations. Future RCTs should compare VDZ to active treatments for longer follow-up periods with larger sample size.