American Journal of Epidemiology Vol. 129, No. 4: 712-722
Copyright © 1989 by The Johns Hopkins University School of Hygiene and Public Health
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CANCER RISK AFTER EVALUATION FOR INFERTILITY
1Environmental Epidemiology Branch National Cancer Institute, Bethesda, MD
2Department of Health Sciences Research Mayo Clinic, Rochester, MN
3Department of Obstetrics and Gynecology Mayo Clinic, Rochester, MN
4Westat, Inc Rockville, MD
Reprint requests to Dr. Louise A. Brinton, Environmental Epidemiology Branch, National Cancer Institute Executive Plaza North, Room 443, Bethesda, MD 20892
To evaluate cancer risk by various causes of infertility, the authors conducted a retrospective cohort study among 2, 335 women evaluated for infertility at the Mayo Clinic between 1935 and 1964. Most cancers occurred at expected fre quencies, with the exception of cancers of the thyroid (standardized incidence ratio (SIR) = 2.6) and other endocrine glands (SIR = 6.7), although analyses were based on small numbers. Patients with progesterone deficIencies (31 per cent of the study subjects) had a 20 per cent higher cancer risk than did those with other causes of infertility, with excesses deriving primarily from cancers of the lung, cervix, ovary, and thyroid and from melanoma. Breast cancer risk, however, was not elevated in either patients with progesterone deficiencies (SIR = 0.9) or patients with other causes of infertility (SIR = 1.0). Examination of other pararn eters of infertility, including age at evaluation, type of infertity (primary vs. secondary), and years of attempted conception, showed no elevated risks of breast cancer in any subgroup. These results fail to support previous studies that have linked progesterone deficiencies among infertile women to elevated breast cancer risk. However, the data suggest a possible involvement of a progesterone deficiency In the etiology of other cancers, particularly thyroid cancer and mela noma.
breast neoplasms; infertility; neoplasms; risk
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