IJE Advance Access published online on May 26, 2004
International Journal of Epidemiology, doi:10.1093/ije/dyh046
© 2004 by International Epidemiological Association
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1 Danish Cancer Society, Institute of Cancer Epidemiology, Copenhagen, Denmark
* To whom correspondence should be addressed. E-mail: susanne{at}cancer.dk.
Background On the basis of a population-based cohort, we assessed the cancer risk, focusing on gynaecological cancers and pre-malignant lesions, among women with a previous tubal sterilization. Methods Using the Danish Hospital Discharge Register we identified 65 232 women who had a tubal sterilization (1977-1993). The cohort was followed for cancer occurrence, and compared with the expected number based on the national cancer incidence rates. Results The overall risk of ovarian cancer was decreased (standardized incidence ratio [SIR] = 0.82; 95% CI: 0.6, 1.0), and it was still decreased Conclusions In this nationwide, population-based study we find that women with tubal sterilization have a decreased risk of subsequent development of ovarian cancer. As the protective effect is not decreasing with years of follow-up, our data do not support that ‘screening’ bias can explain the protective effect, but indicate that the sterilization itself may convey a reduction in risk. The same pattern is found for endometrial cancer, the association being less strong.
Original paper
Tubal sterilization and risk of ovarian, endometrial and cervical cancer. A Danish population-based follow-up study of more than 65 000 sterilized women
2 Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD, USA
Abstract 
10 years after the sterilization (SIR = 0.65; 95% CI: 0.4, 1.0). The rate of endometrial cancer was also decreased (SIR = 0.66; 95% CI: 0.5, 1.0), the risk continued being moderately reduced during follow-up, although it was not statistically significant.
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Related articles in Int. J. Epidemiol.:
- Commentary: Does tubal sterilization reduce the risk of gynaecological cancers?
- David M. Purdie
Int. J. Epidemiol. 2004 10.1093/ije/dyh119.[PDF]
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