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Related Experiment Videos

The kin-cohort study for estimating penetrance

S Wacholder1, P Hartge, J P Struewing

  • 1Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD 20892-7368, USA.

American Journal of Epidemiology
|October 20, 1998
PubMed
Summary

The kin-cohort study design efficiently estimates cancer penetrance for genetic mutations like BRCA1/BRCA2 in Ashkenazi Jews. This method is valuable for understanding mutation effects outside of traditional cancer families.

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Area of Science:

  • Genetics and Cancer Epidemiology
  • Population Genetics
  • Preventive Oncology

Background:

  • Determining cancer penetrance for specific genetic mutations is crucial for risk assessment.
  • Traditional study designs (cohort, case-control) can be less feasible for rare mutations or outside familial contexts.
  • A need exists for efficient methods to estimate mutation penetrance in broader populations.

Purpose of the Study:

  • To evaluate the feasibility and utility of the kin-cohort design for estimating cancer penetrance.
  • To infer the penetrance of specific BRCA1 and BRCA2 mutations in the Ashkenazi Jewish population.
  • To assess the age-specific risk of breast or ovarian cancer associated with these mutations.

Main Methods:

  • Employed a kin-cohort design utilizing volunteer probands from a population with high mutation frequency.

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  • Calculated cancer risk in first-degree relatives based on mutation status of probands.
  • Inferred mutation penetrance using weighted averages assuming known inheritance patterns.

    • Main Results:

    • The kin-cohort design proved feasible for estimating penetrance in a population with high mutation prevalence.
    • Estimated penetrance by age 70 for three common BRCA1/BRCA2 mutations among Ashkenazi Jews was 63% for breast or ovarian cancer.
    • This design allows for rapid penetrance estimation from volunteer data.

    Conclusions:

    • The kin-cohort design is an effective and efficient tool for estimating cancer mutation penetrance.
    • It is particularly useful in populations with a relatively high frequency of specific genetic mutations.
    • Findings provide critical data on the penetrance of BRCA1/BRCA2 mutations relevant to Ashkenazi Jewish women.