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Dietary Iodine and Thyroid Cancer Risk in French Polynesia: A Case-Control Study.
MedLine Citation:
PMID:  22280227     Owner:  NLM     Status:  Publisher    
Background: French Polynesia has one of the world's highest thyroid cancer incidence rates. Iodine is suspected to play a role in this high incidence. The objective of this study was to assess whether low dietary iodine is related to a higher risk of thyroid cancer in the French Polynesian population. Methods: A case-control study was performed among native residents of French Polynesia. It included 229 cases of differentiated thyroid cancer diagnosed between 1979 and 2004 (203 women, 26 men) matched with 371 population controls (324 women, 47 men) on the date of birth. The current study is focused on dietary iodine intake and fish consumption (food rich in iodine) and analyzed by conditional logistic regression. Results: Daily dietary iodine intake was insufficient (<150 μg/day) in 60% of both cases and controls. A decreased risk of thyroid cancer was observed with a higher consumption of fish (p(trend)=0.008) and shellfish (p(trend)=0.002), and also with a higher dietary iodine intake (p(trend)=0.03). There was no significant interaction between the effects of the thyroid radiation dose and the dietary iodine intake (p=0.2). Conclusion: French Polynesia is a mild iodine deficiency area in which a higher consumption of food from the sea and a higher dietary iodine intake are significantly associated with a decreased risk of thyroid cancer. The quantification of this reduction requires specific investigation of iodine intake in traditional Polynesian food.
Enora Cléro; Françoise Doyon; Vaïana Chungue; Frédérique Rachédi; Jean-Louis Boissin; Joseph Sebbag; Larrys Shan; Frédérique Bost-Bezeaud; Patrice Petitdidier; Eric Dewailly; Carole Rubino; Florent de Vathaire
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-26
Journal Detail:
Title:  Thyroid : official journal of the American Thyroid Association     Volume:  -     ISSN:  1557-9077     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9104317     Medline TA:  Thyroid     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1 Radiation Epidemiology Group, CESP Center for Research in Epidemiology and Population Health , U1018 INSERM, Villejuif, France .
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