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  • Title: The risk of colorectal cancer in inflammatory bowel disease: a hospital-based cohort study from Korea.
    Author: Lee HS, Park SH, Yang SK, Ye BD, Kim JH, Kim SO, Soh JS, Lee S, Bae JH, Lee HJ, Yang DH, Kim KJ, Byeon JS, Myung SJ, Yoon YS, Yu CS, Kim JH.
    Journal: Scand J Gastroenterol; 2015 Feb; 50(2):188-96. PubMed ID: 25515241.
    Abstract:
    OBJECTIVE: Limited data are available on the incidence and risk factors of colorectal cancer (CRC) in Asian patients with inflammatory bowel disease (IBD). MATERIAL AND METHODS: Information on 5212 Korean patients with IBD (2414 with Crohn's disease [CD] and 2798 with ulcerative colitis [UC]) was retrieved from the IBD registry of Asan Medical Center. Data on CRC incidence for the entire Korean population were derived from the Korean Statistical Information Service. RESULTS: During 39,951 person-years of follow-up (17,679 for CD and 22,272 for UC), 30 patients (12 with CD and 18 with UC) developed CRC. The standardized incidence ratio (SIR) of CRC was 6.0 (95% confidence interval [CI], 3.10-10.48) for CD and 1.68 (95% CI, 1.00-2.66) for UC; it was 9.69 (95% CI, 5.01-16.93) for CD with colonic involvement and 4.31 (95% CI, 2.46-7.00) for extensive UC. The SIR was also increased in patients diagnosed with IBD at younger than 30 years old. CRC location was the low rectum in 11 of 12 CD patients (91.7%). The cumulative probability of rectal cancer was higher in CD patients with a perianal fistula than in those without a perianal fistula (p = 0.02). CONCLUSIONS: A high prevalence of perianal fistulas in Korean CD patients may be the cause of the predominance of low rectal cancer in this population and the higher SIR of CRC in Koreans than in Westerners. In contrast, the SIR of CRC in Korean UC patients may be similar to that in Western UC patients.
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