Reproductive Factors and Risk of Papillary Thyroid Cancer in Women

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Abstract
The authors conducted a population-based case-control study of 410 women residing in three counties in western Washington State who were aged 18–64 years when diagnosed with papillary thyroid cancer in 1988–1994 and 574 controls to assess the effects of pregnancy history and other aspects of reproductive life on risk of this disease. Among women aged 45–64, the authors observed no associations with number of live births, age at first live birth, or age at last live birth. Risk was somewhat increased in women 5 years before the reference date). Risk of thyroid cancer was also associated with lactation during the previous 5 years (e.g., RR = 2.9, 95% Cl: 1.5, 5.5, among parous women who had breastfed £12 months, vs. 0–1 months, during that interval). Our results suggest that thyroid stimulation during both pregnancy and lactation may result in a transient increase in risk of papillary thyroid cancer. Am J Epidemiol 2000;151:765–72.

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