Occupational exposure to terbufos and the incidence of cancer in the Agricultural Health Study
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Terbufos is the fourth most commonly used organophosphate insecticide (OP) in the United States. Terbufos has not been demonstrated to be carcinogenic in rodents, although non-arsenical insecticides, including OPs, have been associated with excess cancer in epidemiologic studies. We investigated associations between use of terbufos and the incidence of cancer.
The Agricultural Health Study is a prospective cohort study of 57,310 licensed pesticide applicators from Iowa and North Carolina. Detailed information about 50 pesticides, including terbufos, and potential confounders was obtained from self-administered questionnaires. Terbufos intensity-weighted lifetime exposure-days were defined as (lifetime exposure-days) × (exposure intensity score). Cases include all first primary cancers diagnosed between enrollment and December 31, 2005. Hazard ratios (HR) and 95% CI were calculated with Cox proportional hazards models, adjusting for potential confounders.
Overall cancer risk was slightly increased among terbufos users [HR 1.21 (1.06–1.37)]. Suggestive associations were observed between terbufos use and cancers of the prostate (HRhighest tertile = 1.21; 95% CI = 0.99–1.47) and lung (HRmiddle tertile = 1.45; 95% CI = 0.95–2.22) and leukemia (HRmiddle tertile = 2.38; 95% CI = 1.35–4.21) and non-Hodgkin’s lymphoma (HRmiddle tertile = 1.94; 95% CI = 1.16–3.22), although the exposure–response gradients were non-monotonic and p for trends were not significant.
We found suggestive associations between occupational terbufos use and several cancer sites. However, cautious interpretation of these results is warranted by the lack of existing experimental and epidemiologic evidence to support carcinogenic effects of terbufos.
- Occupational exposure to terbufos and the incidence of cancer in the Agricultural Health Study
Cancer Causes & Control
Volume 21, Issue 6 , pp 871-877
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- Springer Netherlands
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- Cancer incidence
- Organophosphate insecticides
- Industry Sectors
- Author Affiliations
- 1. Department of Social and Preventive Medicine, School of Public Health and Health Professions, University at Buffalo, 270 Farber Hall, Buffalo, NY, USA
- 2. Department of Preventive Medicine and Biometrics, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
- 3. Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, USA
- 4. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC, USA
- 5. Biostatistics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, Bethesda, MD, USA