© The Author 2006. Published by Oxford University Press.
ARTICLE |
Projecting Absolute Invasive Breast Cancer Risk in White Women With a Model That Includes Mammographic Density
Affiliations of authors: Department of Biostatistics and Epidemiology, University of Pennsylvania School of Medicine, Philadelphia, PA (JC); Information Management Services, Rockville, MD (DP, RA); Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD (BG, CS, MHG); Cancer Genetics and Epidemiology Program, Georgetown University Lombardi Comprehensive Cancer Center, Washington, DC (CB); Medical School, Rouen University Hospital, Inserm U 657, Rouen, France (JB)
Correspondence to: Mitchell H. Gail, MD, PhD, Biostatistics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD 20892 (e-mail: gailm{at}mail.nih.gov).
Background: To improve the discriminatory power of the Gail model for predicting absolute risk of invasive breast cancer, we previously developed a relative risk model that incorporated mammographic density (DENSITY) from data on white women in the Breast Cancer Detection Demonstration Project (BCDDP). That model also included the variables age at birth of first live child (AGEFLB), number of affected mother or sisters (NUMREL), number of previous benign breast biopsy examinations (NBIOPS), and weight (WEIGHT). In this study, we developed the corresponding model for absolute risk. Methods: We combined the relative risk model with data on the distribution of the variables AGEFLB, NUMREL, NBIOPS, and WEIGHT from the 2000 National Health Interview Survey, with data on the conditional distribution of DENSITY given other risk factors in BCDDP, with breast cancer incidence rates from the Surveillance, Epidemiology, and End Results program of the National Cancer Institute, and with national mortality rates. Confidence intervals (CIs) accounted for variability of estimates of relative risks and of risk factor distributions. We compared the absolute 5-year risk projections from the new model with those from the Gail model on 1744 white women. Results: Attributable risks of breast cancer associated with DENSITY, AGEFLB, NUMREL, NBIOPS, and WEIGHT were 0.779 (95% CI = 0.733 to 0.819) and 0.747 (95% CI = 0.702 to 0.788) for women younger than 50 years and 50 years or older, respectively. The model predicted higher risks than the Gail model for women with a high percentage of dense breast area. However, the average risk projections from the new model in various age groups were similar to those from the Gail model, suggesting that the new model is well calibrated. Conclusions: This new model for absolute invasive breast cancer risk in white women promises modest improvements in discriminatory power compared with the Gail model but needs to be validated with independent data.
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Editorial about this Article
- Assessing Breast Cancer Risk: Evolution of the Gail Model
- Melissa L. Bondy and Lisa A. Newman
J Natl Cancer Inst 2006 98: 1172-1173.[Extract] [Full Text] [PDF]
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