© 1997 by Oxford University Press
Journal Of The National Cancer Institute, Vol 89, 227-238, Copyright © 1997 by Oxford University Press
DA Berry, G Parmigiani, J Sanchez, J Schildkraut and E Winer
BACKGROUND: Heritable mutations of the breast cancer gene BRCA1 are rare,
occurring in fewer than 1% of women in the general population, and
therefore account for a small proportion of cases of breast and ovarian
cancers. Nevertheless, the presence of such mutations is highly predictive
of the development of these cancers. PURPOSE: We developed and applied a
mathematic model for calculating the probability that a woman with a family
history of breast and/or ovarian cancer carries a mutation of BRCA1.
METHODS AND RESULTS: As a basis for the model, we use Mendelian genetics
and apply Bayes' theorem to information on the family history of these
diseases. Of importance are the exact relationships of all family members,
including both affected and unaffected members, and ages at diagnosis of
the affected members and current ages of the unaffected members. We used
available estimates of BRCA1 mutation frequencies in the general population
and age-specific incidence rates of breast and ovarian cancers in carriers
and noncarriers of mutations to estimate the probability that a particular
member of the family carries a mutation. This probability is based on
cancer statuses of all first- and second-degree relatives. We first
describe the model by considering single individuals: a woman diagnosed
with breast and/or ovarian cancer and also a woman free of cancer. We next
considered two artificial and two actual family histories and addressed the
sensitivity of our calculations to various assumptions. Particular
relationships of family members with and without cancer can have a
substantial impact on the probability of carrying a susceptibility gene.
Ages at diagnosis of affected family members and their types of cancer are
also important. A woman with two primary cancers can have a probability of
carrying a mutation in excess of 80%, even with no other information about
family history. The number and relationships of unaffected members, along
with their current ages or ages at death, are critical determinants of
one's carrier probability. An affected woman with several cancers in her
family can have a probability of carrying a mutation that ranges from close
to 100% to less than 5%. CONCLUSION: Our model gives informative and
specific probabilities that a particular woman carries a mutation.
IMPLICATIONS: This model focuses on mutations in BRCA1 and assumes that all
other breast cancer is sporadic. With the cloning of BRCA2, we now know
that this assumption is incorrect. We have adjusted the model to include
BRCA2, but the use of this version must await publication of penetrance
data for BRCA2, including those for male breast cancer that are apparently
associated with BRCA2 but not with BRCA1. The current model is,
nevertheless, appropriate and useful. Of principal importance is its
potential and that of improved versions for aiding women and their health
care providers in assessing the need for genetic testing.
ARTICLES
Probability of carrying a mutation of breast-ovarian cancer gene BRCA1 based on family history
Institute of Statistics and Decision Sciences, Duke University, Durham, NC 27708-0251, USA.
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