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Reproductive Risk Factors for Thyroid Cancer: A Prospective Cohort Study in Khon Kaen, Thailand

  • Sungwalee, Wararat (Department of Epidemiology, Faculty of Public Health, Khon Kaen University) ;
  • Vatanasapt, Patravoot (Department of Otorhinolaryngology, Faculty of Medicine, Khon Kaen University) ;
  • Kamsa-ard, Siriporn (Department of Biostatistics and Demography, Faculty of Public Health, Khon Kaen University) ;
  • Suwanrungruang, Krittika (Cancer Unit, Faculty of Medicine, Khon Kaen University) ;
  • Promthet, Supannee (Department of Epidemiology, Faculty of Public Health, Khon Kaen University)
  • Published : 2013.09.30

Abstract

Background: Because of the gender disparity in the incidence of thyroid cancer, this study aimed to determine the association between reproductive factors and thyroid cancer. Methods: A total of 10,767 eligible women from the Khon Kaen Cohort, recruited and interviewed between 1990 and 2001, were followed up until 2011. The data were linked to the Khon Kaen Population-Based Cancer Registry to detect thyroid cancer cases. Results: There was 17 thyroid cancer cases detected, an incidence of 11.2 per 100,000 person-years, of which 70.6 % were papillary tumors. The incidence was apparently greater among those with an early age of menarche, nulligravida women, and oral contraceptive users. Conlusions: There was a trend for thyroid cancer to develop in relation to longer estrogen exposure. This evidence is inconclusive but warrants further investigation.

Keywords

Risk factors;reproductive factors;thyroid cancer;cohort study;Thailand

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