American Journal of Epidemiology Vol. 147, No. 7: 652-659
Copyright © 1998 by The Johns Hopkins University School of Hygiene and Public Health
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Family History Score as a Predictor of Breast Cancer Mortality: Prospective Data from the Cancer Prevention Study II, United States, 19821991
1 Epidemic Intelligence Service, Epidemiology Program Office and Division of Birth Defects and Developmental Disabilities, National Center for Environmental Health, Centers for Disease Control and Prevention (CDC) Atlanta, GA
2 Office of Genetics and Disease Prevention, CDC Atlanta, GA
3 Epidemiology and Surveillance Research, American Cancer Society, National Home Office Atlanta, GA
4 Department of Epidemiology, Rollins School of Public Health, Emory University Atlanta, GA
Reprint requests to Dr. Quanhe Yang, Birth Defects and Genetic Disease Branch, BDDD, NCEH, 4770 Buford Hwy, MS F-45, Atlanta, GA 30341.
A consistent predictor of a woman's risk for breast cancer is a family history of the disease. Most studies of family history and breast cancer have used the number of affected relatives in the family to calculate relative risk, but they have not considered the heterogeneity of the familial risk for breast cancer in a systematic way. With the use of data from a large prospective mortality study of US adults, the authors compared simple classification of family history of breast cancer (yes/no) to the method of using a quantitative family history score method, which takes into account the effects of family structure, age, and birth cohort as predictors of breast cancer mortality. After 9 years of follow-up, 1,428 cases of fatal breast cancer were observed among 453,073 women with complete information on number and age of siblings and family history. With the use of the family history score, about one-third of women with a positive family history of breast cancer were at no higher risk for breast cancer mortality than those without a family history of the disease. As a quantitative measure of relative risk for each family, family history score gave a better fit to the data, and it provided an incremental improvement of predictive accuracy of developing fatal breast cancer. Family history score can also be used as a categorical variable to stratify families. This allows researchers to focus on which risk groups would benefit from conducting further genetic analysis and to test the effects of genetic factors, environmental exposure, and gene-environment interactions on the etiology of the development of breast cancer. Am J Epidemiol 1998; 147: 6529.
breast neoplasms; cohort studies; family characteristics; family history score; genetics
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