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  • Title: Cancer Risk in 2621 Chinese Patients with Inflammatory Bowel Disease: A Population-based Cohort Study.
    Author: So J, Tang W, Leung WK, Li M, Lo FH, Wong MTL, Sze ASF, Leung CM, Tsang SWC, Shan EHS, Chan KH, Lam BCY, Hui AJ, Chow WH, Lam TY, Lam V, Lee TW, Lo HHH, Tang CM, Wong CL, Wu JCY, Chan FKL, Sung JJY, Harbord M, Ng SC.
    Journal: Inflamm Bowel Dis; 2017 Nov; 23(11):2061-2068. PubMed ID: 28991855.
    Abstract:
    BACKGROUND: Studies on cancer risk in inflammatory bowel disease (IBD) have yielded inconsistent results. We conducted a population-based study to determine the risk of cancer in patients with Crohn's disease (CD) and ulcerative colitis (UC). METHODS: Using a territory-wide IBD registry in Hong Kong, we identified 2621 patients with IBD and no history of cancer from 1990 to 2016. We followed them from diagnosis until either September 2016, cancer development, proctocolectomy, or death. Standardized incidence ratios (SIRs) of overall cancer and site-specific cancers were calculated. RESULTS: Of 2621 patients with IBD (1108 CD; 1603 UC; median age, 49 yr; 59.5% men) followed for 26,234 person-years, 88 patients developed cancer after IBD diagnosis. Patients with CD had an increased risk of anorectal cancers (SIR 4.11; 95% confidence interval (CI), 1.84-9.14) and hematological cancers (SIR 3.86, 95% CI, 1.61-9.27) including leukemia (SIR 5.98; 95% CI, 1.93-18.54). Nonmelanoma skin cancer was significantly increased in both CD and UC (CD: SIR 13.88; 95% CI, 1.95-98.51; UC: SIR 9.05; 95% CI, 2.26-36.19). Patients with CD had a higher risk of renal-cell carcinoma (SIR 6.89; 95% CI, 2.22-21.37), and patients with UC had a higher risk of prostate cancer (SIR 2.47; 95% CI, 1.24-4.95). CONCLUSIONS: In a population-based study, Chinese patients with CD are at an increased risk of anorectal cancers and hematological cancers compared with the general population. A higher risk of nonmelanoma skin cancer was also observed in CD and UC. Cancer surveillance should be considered.
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