Cancer incidence among pesticide applicators exposed to Dicamba in the Agricultural Health Study

Claudine Samanic, Jennifer Rusiecki, Mustafa Dosemeci, Lifang Hou, Jane A. Hoppin, Dale P. Sandler, Jay Lubin, Aaron Blair, Michael C R Alavanja

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Background: Dicamba is an herbicide commonly applied to crops in the United States and abroad. We evaluated cancer incidence among pesticide applicators exposed to dicamba in the Agricultural Health Study, a prospective cohort of licensed pesticide applicators in North Carolina and Iowa. Methods: Detailed pesticide exposure information was obtained through a self-administered questionnaire completed from 1993 to 1997. Cancer incidence was followed through 31 December 2002 by linkage to state cancer registries. We used Poisson regression to estimate rate ratios and 95% confidence intervals for cancer subtypes by tertiles of dicamba exposure. Two dicamba exposure metrics were used: lifetime exposure days and intensity-weighted lifetime exposure days (lifetime days x intensity score). Results: A total of 41,969 applicators were included in the analysis, and 22,036 (52.5%) reported ever using dicamba. Exposure was not associated with overall cancer incidence nor were there strong associations with any specific type of cancer. When the reference group comprised low-exposed applicators, we observed a positive trend in risk between lifetime exposure days and lung cancer (p = 0.02), but none of the individual point estimates was significantly elevated. We also observed significant trends of increasing risk for colon cancer for both lifetime exposure days and intensity-weighted lifetime days, although these results are largely due to elevated risk at the highest exposure level. There was no apparent risk for non-Hodgkin lymphoma. Conclusions: Although associations between exposure and lung and colon cancer were observed, we did not find clear evidence for an association between dicamba exposure and cancer risk.

Original languageEnglish (US)
Pages (from-to)1521-1526
Number of pages6
JournalEnvironmental health perspectives
Volume114
Issue number10
DOIs
StatePublished - Oct 2006

Keywords

  • Cancer incidence
  • Farming
  • Neoplasms
  • Pesticides
  • United States

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

Fingerprint Dive into the research topics of 'Cancer incidence among pesticide applicators exposed to Dicamba in the Agricultural Health Study'. Together they form a unique fingerprint.

Cite this