American Journal of Epidemiology Advance Access originally published online on May 4, 2006
American Journal of Epidemiology 2006 164(1):56-62; doi:10.1093/aje/kwj152
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Original Contribution |
Risk Factors for the Incidence of Endometrial Cancer according to the Aggressiveness of Disease
1 Program in Epidemiology, Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
2 Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle, WA
3 Department of OtolaryngologyHead and Neck Surgery, School of Medicine, University of Washington, Seattle, WA
4 Department of Internal Medicine, School of Medicine, University of New Mexico, Albuquerque, NM
5 Current affiliation: Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD
Correspondence to Dr. Jocelyn Weiss, Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 6120 Executive Boulevard, EPS 8123, MSC 7240, Bethesda, MD 20892 (e-mail: weissjoc{at}mail.nih.gov).
There is a wide range of aggressiveness of endometrial tumors, some being indolent and easily treated while others metastasize and prove fatal. The authors used data from three population-based, case-control studies to determine if etiologic factors differ for aggressive disease. Interview data were obtained from 1,304 female residents of western Washington State who were 4574 years of age and diagnosed with endometrial cancer during 19851991, 19941995, and 19971999 and from 1,779 controls who were of similar ages and selected primarily by random digit dialing. As a means of gauging aggressiveness, tumor characteristics were abstracted from the population-based cancer registry that serves western Washington State. The risk of endometrial cancer among long-term users (
8 years) of unopposed estrogens was particularly high for the least aggressive tumors (odds ratio = 18.6, 95% confidence interval: 12.2, 28.6) but was elevated for moderate and highly aggressive tumors as well (odds ratios = 6.6 and 7.1, respectively). Women who were obese, had a history of diabetes, and had fewer than two children were also at increased risk, regardless of tumor aggressiveness, while oral contraceptive users were at decreased risk of only relatively more aggressive disease. In general, a woman's risk of endometrial cancer appears to be influenced by similar risk factors regardless of disease severity.
endometrial neoplasms; neoplasm invasiveness
Abbreviations: CI, confidence interval; OR, odds ratio
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