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Familial Cancer

, Volume 6, Issue 1, pp 53–62 | Cite as

Very high incidence of familial colorectal cancer in Newfoundland: a comparison with Ontario and 13 other population-based studies

  • R. C. Green
  • J. S. Green
  • S. K. Buehler
  • J. D. Robb
  • D. Daftary
  • S. Gallinger
  • J. R. McLaughlin
  • P. S. Parfrey
  • H. B. Younghusband
Original Paper

Abstract

Newfoundland has the highest rate of colorectal cancer (CRC) of any Canadian province. In order to investigate the factors, especially genetic components, responsible for CRC we established the Newfoundland Colorectal Cancer Registry. In a 5-year period we examined every case of CRC diagnosed under the age of 75 years and obtained consent from 730 cases. Careful analysis of family history was used to assign a familial cancer risk, based on established criteria. We observed that 3.7% of CRC cases came from families meeting the Amsterdam II criteria and a further 0.9% of cases involved familial adenomatous polyposis (FAP). An additional 43% of cases met one or more of the revised Bethesda criteria and 31% of all cases had a first-degree relative affected with CRC. We compared the Newfoundland data with data from the province of Ontario, where the same recruitment and risk-assessment criteria were used. In all categories, the indicators of familial risk were significantly higher in Newfoundland. These data were also compared to results published from 13 other population-based studies worldwide. In every category the proportion of Newfoundland cases meeting the criteria was higher than in any other population. The mean differences were: 3.5-fold greater for FAP, 2.8-fold higher for Amsterdam criteria, 2.0-fold higher for Bethesda criteria and 1.9-fold higher for the number of affected first-degree relatives. We conclude that the high incidence of CRC in Newfoundland may be attributable to genetic, or at least familial, factors. In the high-risk families we provide evidence for the involvement of founder mutations in the APC and MSH2 genes.

Keywords

Colorectal cancer Family history Founder effect HNPCC Incidence Lynch syndrome Meta-analysis MYH Newfoundland Ontario 

Notes

Acknowledgements

This work was supported by an Interdisciplinary Health Research Team award from the Canadian Institutes of Health Research (CRT-43821) and by the National Cancer Institute, National Institutes of Health, USA, under RFA No.CA-95-011 (Grant no. U01-CA74783). We extend our thanks and appreciation to the many patients and their relatives who gave of their time to make this research possible. We gratefully acknowledge the work done by Angie Batstone, Elizabeth Dicks, Katrina Hurley, Montgomery Keough, Carol Negrijn, and Jackie Stokes (Newfoundland) and Rose Sarvaria, Neerav Monga, Kristyn Langeraap, Wing Chan, Seanny Yu and Teresa Bianco (Ontario) in contacting study participants and collecting data.

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Copyright information

© Springer Science + Business Media B.V. 2006

Authors and Affiliations

  • R. C. Green
    • 1
  • J. S. Green
    • 1
  • S. K. Buehler
    • 1
  • J. D. Robb
    • 1
  • D. Daftary
    • 2
  • S. Gallinger
    • 3
  • J. R. McLaughlin
    • 2
  • P. S. Parfrey
    • 1
  • H. B. Younghusband
    • 1
  1. 1.Faculty of MedicineMemorial University of NewfoundlandSt. John’sCanada
  2. 2.Cancer Care OntarioTorontoCanada
  3. 3.Samuel Lunenfeld Research InstituteUniversity of TorontoTorontoCanada

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