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Review
. 2015 Feb 14;21(6):1956-71.
doi: 10.3748/wjg.v21.i6.1956.

Distinctive inflammatory bowel disease phenotype in primary sclerosing cholangitis

Affiliations
Review

Distinctive inflammatory bowel disease phenotype in primary sclerosing cholangitis

A Boudewijn de Vries et al. World J Gastroenterol. .

Abstract

Aim: To review the current literature for the specific clinical characteristics of inflammatory bowel disease (IBD) associated with primary sclerosing cholangitis (PSC).

Methods: A systematical review for clinical characteristics of IBD in PSC was performed by conducting a broad search for "primary sclerosing cholangitis" in Pubmed. "Clinical characteristics" were specified into five predefined subthemes: epidemiology of IBD in PSC, characteristics of IBD in PSC (i.e., location, disease behavior), risk of colorectal cancer development, IBD recurrence and de novo disease after liver transplantation for PSC, and safety and complications after proctocolectomy with ileal pouch-anal anastomosis. Papers were selected for inclusion based on their relevance to the subthemes, and were reviewed by two independent reviewers. Only full papers relevant to PSC-IBD were included. Additionally the references of recent reviews for PSC (< 5 years old) were scrutinized for relevant articles.

Results: Initial literature search for PSC yielded 4704 results. After careful review 65 papers, comprising a total of 11406 PSC-IBD patients, were selected and divided according to subtheme. Four manuscripts overlapped and were included in two subthemes. Prevalence of IBD in PSC shows a large variance, ranging from 46.5% to 98.7% with ulcerative colitis (UC) being the most common type (> 75%). The highest IBD rates in PSC are found in papers reviewing both endoscopic and histological data for IBD diagnosis. Although IBD in PSC is found to be a quiescent disease, pancolitis occurs often, with rates varying from 35% to 95%. Both backwash ileitis and rectal sparing are observed infrequently. The development of dysplasia or colorectal carcinoma is increased in PSC-IBD; the cumulative 10 years risk varying between 0% and 11%. Exacerbation of IBD is common after liver transplantation for PSC and de novo disease is seen in 1.3% to 31.3% of PSC-IBD patients. The risk for development of pouchitis in PSC-IBD is found to be significant, affecting 13.8% to 90% of the patients after proctocolectomy with ileo anal-pouch anastomosis.

Conclusion: IBD in primary sclerosing cholangitis represents a distinct phenotype that differs from UC and Crohn's disease and therefore requires specialized management.

Keywords: Clinical characteristics; Incidence; Inflammatory bowel disease; Liver transplantation; Pouchitis; Primary sclerosing cholangitis; Risk of colorectal carcinoma.

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Figures

Figure 1
Figure 1
Flow chart paper inclusion: An overview of study selection for papers included in the present review. PSC: Primary sclerosing cholangitis; IBD: Inflammatory bowel disease; CRC: Colorectal cancer; OLT: Orthotopic liver transplantation.
Figure 2
Figure 2
Case ascertainment: A comparison of included primary sclerosing cholangitis - inflammatory bowel disease epidemiology studies based on case ascertainment. PSC: Primary sclerosing cholangitis; IBD: Inflammatory bowel disease.

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