Research Results
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2021
PLOS One
A case-control study in Ethiopia examined 50 breast cancer patients and 50 controls to investigate whether exposure to organochlorine pesticides is a risk factor for breast cancer in a low- and middle-income country context. Ten organochlorine pesticides were detected in participants’ serum, with heptachlor found at highest concentrations; mean serum levels of p,p’-DDE, p,p’-DDT, heptachlor, gamma-chlordane, endosulfan, and dibutyl-chlorendate were significantly higher in breast cancer patients than controls, and p,p’-DDT and gamma-chlordane emerged as significant predictors of breast cancer, with each unit increase in p,p’-DDT concentration doubling breast cancer odds (AOR = 2.03; 95% CI: 1.04-3.97) and each unit increase in gamma-chlordane tripling the odds (AOR = 3.12; 95% CI: 1.19-8.20). These findings suggest that organochlorine pesticide exposure may be a significant breast cancer risk factor in Ethiopia, where environmental contamination from these persistent organic pollutants remains a concern despite global restrictions. The study highlights the public health importance of reducing exposure to these banned or restricted pesticides in developing countries and emphasizes the need for continuous biomonitoring of persistent organic pollutants to inform disease prevention strategies and mitigation measures, particularly as breast cancer incidence rises in low- and middle-income countries where environmental regulation may be less stringent.
2019
J Occup Environ Med
This case control study was conducted among Hispanic women agricultural workers who are exposed to pesticides. Chemicals associated with BC risk included organophosphates, organochlorines, and a phthalimide, Captan. The study concluded that agricultural work may be associated with increased BC risk in female Hispanic farm workers.
2015
Carcinogenesis
This study explores the linkage between environmental chemical exposures and cellular resistance to cell death, a carcinogenic trait. The researchers in this study specifically investigate BPA, chlorothalonil, dibutyl phthalate, and more because of their disruptive effects that may be involved in these carcinogenic pathways. The researchers found that arsenic interferes with cellular signaling pathways and induces oxidative stress, leading to impaired apoptosis; dioxins bind to aryl hydrocarbon receptors (AHRs), which alters gene expression and disrupts normal cell death processes; BPA mimics the estrogen hormone, affecting hormonal balance and promoting cell survival pathways that inhibit cell death. By allowing cells to evade cell death, these environmental chemicals can promote the survival of cells with genetic mutations and therefore increase the risk of cancer development.