Research Results
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2018
Environ Res
A study of women from the Western New York Exposures and Breast Cancer Study examined associations between early life air pollution exposure (total suspended particulates and traffic emissions as proxies for polycyclic aromatic hydrocarbons) and DNA methylation of nine genes in breast tumor tissue, finding nominally significant associations including higher TSP at first birth associated with altered SCGB3A1 (OR=0.48) and SYK (OR=1.86) methylation, and traffic emissions at menarche associated with increased SYK methylation (OR=2.37), though none remained significant after multiple comparison adjustment. These preliminary findings provide suggestive evidence that ambient air pollution exposure during critical developmental windows (birth, menarche, first birth) may influence epigenetic methylation patterns of tumor suppressor genes in breast tissue, potentially representing a mechanism linking early life environmental exposures to later breast cancer risk. Larger studies assessing more methylation sites are warranted to confirm whether air pollution exposure during vulnerable life stages causes lasting epigenetic changes that contribute to breast cancer development.
2018
Environ Res
A systematic review of 158 studies examining environmental chemicals and breast cancer found the strongest evidence for increased risk from exposures during critical developmental periods (in utero, adolescence, pregnancy) to DDT, dioxins, PFOSA, air pollution, and occupational solvents, with risk estimates ranging from 1.4 to 5 times higher. A landmark 50-year study that captured DDT exposure during windows of breast development showed particularly elevated risks, while research on genetic variations found that women with certain DNA repair gene variants had higher breast cancer risk from PAH (polycyclic aromatic hydrocarbon) exposure. However, most studies failed to assess exposure timing during biologically relevant windows of susceptibility, and many current-use chemicals in consumer products remain inadequately studied, with major challenges including reconstructing decades-old exposures and measuring rapidly metabolized chemicals in complex real-world mixtures.
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.
2012
Environ Health Perspect
This study analyzed 213 everyday products, including cosmetics, cleaners, and personal care items, for endocrine-disrupting chemicals (EDCs) and asthma-related compounds. Testing revealed 55 chemicals, with fragranced products and sunscreens containing the highest levels. Vinyl products were also found to contain significant amounts of bis(2-ethylhexyl) phthalate (DEHP), a known EDC. Many harmful chemicals were not listed on product labels, limiting consumer ability to avoid them. These results highlight the presence of potentially harmful chemicals in commonly used products, raising concerns about their widespread use in household and personal care items.
2007
Cancer
A comprehensive review found that while laboratory studies have identified numerous environmental chemicals that cause breast tumors in animals or mimic estrogen, human epidemiological evidence is strongest for PAHs (found in air pollution and grilled foods) and PCBs (banned industrial chemicals), particularly in women with certain genetic variations affecting how their bodies process these chemicals and hormones. Evidence linking dioxins and organic solvents to breast cancer is limited but suggestive, while many chemicals identified as mammary carcinogens in animal studies have never been investigated in human populations due to challenges in measuring past exposures and the decades-long delay between exposure and cancer diagnosis. The review argues that given these methodological limitations in human studies, policymakers should rely more heavily on animal and laboratory evidence to develop regulations that reduce chemical exposures, as waiting for definitive human proof may unnecessarily delay prevention strategies that could reduce breast cancer rates.