What is the annual incidence rate of CRC in patients with UC lasting more than ten years

What is known

- In ulcerative colitis, the risk of colorectal cancer becomes appreciable after about 10 years of disease, and a 2001 meta-analysis reported that the annual incidence rate rose across decades of disease, roughly 2 per 1000 person-years in the first decade, 7 per 1000 in the second decade, and 12 per 1000 in the third decade. ¹ - Those 2001 pooled rates came predominantly from referral and tertiary-centre series collected between the 1950s and 2000, and are now widely regarded as an overestimate of contemporary risk. Population-based cohorts and pooled analyses published since 2012 report roughly 1% cumulative colorectal cancer risk at 10 years, 2% at 20 years and 5% beyond 20 years, roughly 2 to 4 fold lower than the older figures, attributed to surveillance colonoscopy, wider mucosal healing on maintenance therapy and earlier colectomy. - For disease lasting more than ten years, the older pooled figure is on the order of about 7 per 1000 person-years (~0.7%), rising as duration lengthens; contemporary population-based estimates are appreciably lower and should be used when counselling a patient. ¹

What is unknown / caveats

- The incidence is reported in decade bands rather than as a single annual rate for disease lasting more than ten years; the figure quoted for that window is given as an approximation ("on the order of") rather than a directly reported value. - The rate is not described as constant beyond ten years. It rises further as duration lengthens, so one annual figure does not characterise the whole period.

## References

1. Sebastian S, Hernández V, Myrelid P, Kariv R, Tsianos E, Toruner M, Marti-Gallostra M, Spinelli A, van der Meulen-de Jong AE, Yuksel ES, Gasche C, Ardizzone S, Danese S. Colorectal cancer in inflammatory bowel disease: results of the 3rd ECCO pathogenesis scientific workshop (I). J Crohns Colitis. 2014;8(1):5-18. PMID: 23664897.

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_Draft, generated by the IBDology RAG and not yet clinician-reviewed. Answers are grounded in the retrieved literature listed above; a high faithfulness score means the answer matches its sources, not that the sources are correct._