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News
Having a family history of colorectal cancer (CRC) raises your risk — whether or not you have IBD. A large Swedish study found the danger is greatest for those with two or more first-degree relatives diagnosed with CRC, prompting researchers to question whether current surveillance guidelines need an update.
A large Swedish register-based study tracking over 1.3 million people found that a family history of colorectal cancer (CRC) meaningfully increases CRC risk — both in patients with inflammatory bowel disease (IBD) and in the general population. The study followed participants from 1996 to 2023, with a median follow-up of 11 years.
The risk was highest among those with two or more first-degree relatives (parents, siblings, or children) diagnosed with CRC. Notably, patients with ulcerative colitis and two or more affected relatives had the steepest incidence rate — 4.08 cases per 1,000 person-years. Even without a family history, IBD patients faced a higher absolute 10-year CRC risk than the general population (0.83% vs. 0.63%).
Why it matters: Current AGA and ECCO guidelines focus intensified surveillance on patients with early-onset CRC family history. This study suggests the number of affected relatives — not just age of onset — may be a stronger trigger for heightened screening, potentially reshaping surveillance protocols for IBD patients.
