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2023
Frontiers
This meta-analysis aimed to evaluate the association between exposure to endocrine-disrupting chemicals (EDCs), including phthalates and other common environmental pollutants, and breast cancer risk. The study found that certain EDCs—such as p,p′-DDT, chlordane, HCH, and specific PCBs—were positively associated with increased breast cancer risk, while a few compounds like BBP and PFDoDA showed a negative association.
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.
2014
Environ Health Perspect
This review of exposure biomarkers for chemicals potentially linked to breast cancer identified methods for 102 chemicals causing mammary tumors in rodents, finding biomarkers for nearly 75% of them, with human exposure biomarkers existing for 62 chemicals (45 measured in non-occupationally exposed populations) and the CDC tracking 23 of them. Among rodent mammary carcinogens with >50% population detection frequency were PAHs (98%), methyleugenol (98%), PFOA (>50%), chlordane (>50%), acrylamide (>50%), and benzene (>50%), indicating near-universal exposure to multiple mammary carcinogens, with several additional chemicals showing >50% detection of urinary metabolites including ethylene oxide, acrylonitrile, fenvalerate, and vinyl chloride (71-75%). The study found consistent carcinogenicity between humans and rodents for many chemicals, though limited data exists for direct effects in humans, and emphasizes the availability of biomonitoring tools and resources to advance breast cancer prevention efforts. The findings underscore that populations are ubiquitously exposed to multiple known mammary carcinogens simultaneously, highlighting the urgent need for biomonitoring programs to assess mixed exposures and inform prevention strategies targeting modifiable environmental risk factors for breast cancer.