Impact of Family History on Colorectal Cancer Risk in Inflammatory Bowel Disease and in Matched General Population Comparators.

Family history of colorectal cancer increases CRC incidence similarly in IBD patients and the general population, especially with multiple affected relatives, but the relative impact is weaker in IBD.

• Why it matters: Understanding how family history influences CRC risk in IBD is crucial for optimizing screening and prevention strategies, as current guidelines may not fully account for these differences.
• What they did: A nationwide, register-based cohort study analyzed 124,387 IBD patients and matched comparators from 1996 to 2023, assessing CRC incidence rates based on family history and age at CRC diagnosis in relatives.
• The result: The study found that family history raised CRC incidence in both groups, with the highest increase in those with ≥2 affected relatives, prompting a reevaluation of surveillance priorities to focus on multiple affected relatives rather than early-onset cases alone.