Thought this might be of some interest - especially to any with contacts in agriculture and pest control, but also more generally. After all, many of us have some exposure to such compounds.
I do find it surprising that any of the compounds is associated with decreased risk.
Environ Int. 2018 Jun 13;118:282-292. doi: 10.1016/j.envint.2018.05.041. [Epub ahead of print]
Incident thyroid disease in female spouses of private pesticide applicators.
Shrestha S1, Parks CG1, Goldner WS2, Kamel F1, Umbach DM3, Ward MH4, Lerro CC4, Koutros S4, Hofmann JN4, Beane Freeman LE4, Sandler DP5.
Author information
1 Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA.
2 University of Nebraska Medical Center, Omaha, NE, USA.
3 Biostatistics and Computational Biology Branch, Research Triangle Park, NC, USA.
4 Occupational and Environmental Epidemiology Branch, National Cancer Institute, Rockville, MD, USA.
5 Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA. Electronic address: sandler@niehs.nih.gov.
Abstract
BACKGROUND:
Little is known about modifiable risk factors for thyroid disease. Several pesticides have been implicated in thyroid disruption, but clinical implications are not clear.
OBJECTIVE:
We assessed associations between pesticide use and other farm exposures and incident hypothyroidism and hyperthyroidism in female spouses of farmers in the Agricultural Health Study (AHS).
METHODS:
We used Cox proportional hazards models to estimate hazard ratios (HR) and 95% confidence intervals for risk of thyroid disease in 24,092 spouses who completed at least one follow-up questionnaire.
RESULTS:
We identified 1627 hypothyroid and 531 hyperthyroid cases over 20 years of follow-up. The fungicides benomyl, maneb/mancozeb, and metalaxyl, the herbicide pendimethalin, and among those over 60 years of age the insecticides parathion and permethrin (applied to crops) were associated with elevated hypothyroidism risk, with HR ranging from 1.56-2.44. Conversely, the insecticide phorate, and the herbicides imazethapyr and metolachlor were associated with decreased risk (HR ranging 0.63-0.73), as were long-term farm residence and other farm-related activities (HR ranging 0.69-0.84). For hyperthyroidism, the insecticide diazinon, the fungicides maneb/mancozeb, and the herbicide metolachlor were associated with increased risk (HR ranging 1.35-2.01) and the herbicide trifluralin with decreased risk (HR: 0.57).
CONCLUSIONS:
Several individual pesticides were associated with increased risk of hypothyroidism and hyperthyroidism, although some pesticides were associated with decreased risk. Some of the findings, specifically associations with fungicides, are consistent with results from an earlier analysis of prevalent diseases in AHS spouses.
Published by Elsevier Ltd.
KEYWORDS:
Agricultural Health Study; Hyperthyroidism; Hypothyroidism; Pesticides
PMID: 29908479
DOI: 10.1016/j.envint.2018.05.041