Ecological Analysis of the Association Between 2,4-Dichlorophenoxyacetic Acid (2,4-D) Exposure and Thyroid Cancer Incidence in the United States
The strong associations observed in rural counties suggest that agricultural context may influence the observed relationship between county-level 2,4-D use and thyroid cancer incidence and additional mechanistic and longitudinal studies are required to establish causality and to elucidate underlying endocrine pathways.