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Cancer risks for relatives of patients with serrated polyposis
Aung Ko Win1, Rhiannon J Walters, Daniel D Buchanan
1Centre for MEGA Epidemiology, School of Population Health, University of Melbourne, Carlton, Victoria, Australia.
Relatives of serrated polyposis patients have a significantly increased risk of colorectal and pancreatic cancers. This suggests an inherited component to serrated polyposis, highlighting the need for family cancer risk assessment.
Area of Science:
- Gastroenterology
- Oncology
- Genetics
Background:
- Serrated polyposis is characterized by multiple colorectal polyps with serrated architecture.
- Patients with serrated polyposis have an elevated risk of colorectal cancer (CRC) and potentially extracolonic cancers.
- The cancer risk for relatives of serrated polyposis patients remains underexplored.
Purpose of the Study:
- To estimate the risks of CRC and extracolonic cancers in relatives of serrated polyposis patients.
- To investigate the potential inherited component of serrated polyposis.
Main Methods:
- Retrospective analysis of a cohort of 1,639 first- and second-degree relatives of 100 index serrated polyposis patients.
- Data collected from genetic clinics in Australia, New Zealand, Canada, and the USA.
- Calculation of country-, age-, and sex-specific standardized incidence ratios (SIRs) compared to the general population.
Main Results:
- A total of 102 CRCs were observed in relatives (SIR 2.25, P<0.001), with a higher risk in first-degree relatives (SIR 5.16, P<0.001).
- An increased risk of pancreatic cancer was observed in first-degree relatives (SIR 3.64, P=0.003).
- No increased risk was found for stomach, brain, breast, or prostate cancers.
Conclusions:
- Relatives of serrated polyposis patients face a significantly elevated risk of colorectal and pancreatic cancers.
- These findings support the hypothesis that serrated polyposis has an inherited genetic basis.
- Family cancer risk assessment is crucial for individuals with serrated polyposis.
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