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Title: Anal carcinoma in inflammatory bowel disease.
Authors: Frisch M,  Johansen C
Journal: Br J Cancer
Date: 2000 Jul
Branches: IIB
PubMed ID: 10883673
PMC ID: PMC2374535
Abstract: We followed 9602 patients with Crohn's disease or ulcerative colitis for anal squamous cell carcinoma for up to 18 years. No significant increase was observed: two cases occurred vs 1.3 expected during 99,229 person-years of observation, (standardized incidence ratio = 1.6; 95 confidence interval: 0.2-5.7). Anal squamous cell carcinoma is rare even in inflammatory bowel disease.