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A nested case-control study of polychlorinated biphenyls, organochlorine pesticides, and thyroid cancer in the Janus Serum Bank cohort
  • Published Date:
    Apr 23 2018
  • Source:
    Environ Res. 165:125-132.


Public Access Version Available on: August 01, 2019 information icon
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Details:
  • Pubmed ID:
    29698872
  • Pubmed Central ID:
    PMC5999553
  • Description:
    Background

    Polychlorinated biphenyls (PCBs) and organochlorine pesticides have been associated with altered thyroid hormone levels in humans, but their relationship with thyroid cancer is unknown.

    Methods

    We conducted a nested case-control study of thyroid cancer in the Norwegian Janus Serum Bank cohort using pre-diagnostic blood samples from 1972-1985. Incident thyroid cancer (n=108) was ascertained through 2008. Controls were matched 2:1 by age, date of blood draw, gender, and county. We used gas chromatography/mass spectrometry to quantify 36 PCB congeners and metabolites of pesticides DDT, chlordane, hexachlorocyclohexane, and hexachlorobenzene. PCBs and pesticide metabolites were evaluated individually and summed by degree of chlorination and parent compound, respectively. Odds ratios (OR) and 95% confidence intervals (CI) were computed using conditional logistic regression per specified increase in lipid-adjusted concentration. We additionally stratified analyses by birth cohort (1923-1932-1933-1942-1943-1957).

    Results

    Increasing concentration of DDT metabolites (ORper 1000ng/g=0.80, 95%CI=0.66-0.98) was inversely associated with thyroid cancer. Associations for PCBs were null or in inverse direction. We observed interactions for total PCBs, moderately-chlorinated PCBs, and chlordane metabolites with birth cohort (p ≤0.04). Among participants born 1943-1957, total PCBs (ORper 100ng/g=1.25, 95%CI=1.00-1.56), moderately-chlorinated PCBs (ORper 100ng/g=1.31, 95%CI=1.01-1.70), and chlordane metabolites (ORper 10ng/g=1.78, 95%CI=1.09-2.93) were positively associated with thyroid cancer. For individuals born before 1943, associations were generally null or in the inverse direction.

    Conclusions

    Emissions of PCBs and OC pesticides varied over time. Different risk patterns by birth cohort suggest the potential importance of timing of exposure in thyroid cancer risk. Further evaluation of these associations is warranted.

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