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• W2896773481 abstract "Appendectomy decreases the risk of developing ulcerative colitis [UC], and is suggested to have a beneficial effect on the clinical course of established UC. However, recent studies showed no significantly decreased colectomy rate, and moreover an apparently increased risk of colorectal cancer [CRC]. We aimed to investigate the suggested correlation in a meta-analysis and to analyse possible confounding factors. A systematic review and meta-analysis were performed using MEDLINE, EMBASE, and the Cochrane Library. Data from studies describing the influence of appendectomy on colectomy and CRC were extracted from published reports. Exclusion criteria were patients aged <18 years, non-UC, and animal studies. From 891 studies, 13 studies evaluating 73323 UC patients [appendectomy n = 2859] were included. All studies, except one, were rated as poor quality. Overall, colectomy rate in appendectomised and non-appendectomised patients was not significantly different (odds ratio [OR] 1.25, 95% confidence interval [CI] 0.88–1.77, I2 = 53%). The proportion of colectomies undertaken for CRC or high-grade dysplasia [HGD] was significantly higher after appendectomy [OR 2.85, 95% CI 1.40–5.78, I2 = 32%], with 50% of the colectomies indicated for CRC/HGD compared with 9.4% in non-appendectomised patients. Possible additional confounding factors were a longer UC disease duration, less medication use, and a higher prevalence of primary sclerosing cholangitis [PSC] in appendectomised patients. Appendectomy in established UC is associated with apparently higher rates of subsequent CRC/HGD, but this appears to be due to inequalities in at-risk exposure between groups, presumably secondary to positive clinical effects of appendectomy on disease symptoms. This finding emphasises the importance of regular endoscopic surveillance in this patient group." @default.
• W2896773481 created "2018-10-26" @default.
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• W2896773481 date "2018-10-18" @default.
• W2896773481 modified "2023-10-17" @default.
• W2896773481 title "The Risk of Colectomy and Colorectal Cancer After Appendectomy in Patients With Ulcerative Colitis: A Systematic Review and Meta-analysis" @default.
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• W2896773481 doi "https://doi.org/10.1093/ecco-jcc/jjy163" @default.
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