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2024
Environ Health Perspect
A nationwide study using CDC biomonitoring data found that California’s Proposition 65, which requires warnings about chemicals that cause cancer or reproductive harm, led to reduced exposures to listed chemicals across the entire United States, not just California. While blood and urine concentrations of 37 monitored chemicals generally declined over time, the researchers found evidence of problematic chemical substitution—for example, after bisphenol A (BPA) was listed, its concentrations dropped 15% but levels of the unlisted substitute bisphenol S (BPS) increased 20%. Californians generally had lower levels of harmful chemicals in their bodies compared to residents of other states, suggesting the law had additional protective effects. The findings indicate that transparency laws like Prop 65 can drive manufacturers to reformulate products nationwide, but regulations need to address entire chemical classes rather than individual substances to prevent companies from simply switching to similar but unlisted toxic chemicals.
2023
Int J Cancer
This study of over 1,200 postmenopausal women found that higher blood levels of PFOS (a common “forever chemical” found in items like stain-resistant fabrics and food packaging) were associated with 59-134% increased risk of hormone receptor-positive breast cancers, while PFOA (another widespread PFAS chemical) showed modest associations with hormone receptor-negative tumors. PFAS are called “forever chemicals” because they persist indefinitely in the environment and human body, and these findings suggest they may contribute to breast cancer through hormone disruption. These results add to growing concerns about PFAS exposure from contaminated water, food packaging, and consumer products, though the different associations for PFOS and PFOA by tumor subtype require further investigation to fully understand how these chemicals affect breast cancer development.
2022
Cancer Epiemiol
The first Indian case-control study examining phthalates (chemicals widely used in plastics, cosmetics, and food packaging) and breast cancer found that women with higher urinary levels of di-butyl phthalate (DBP) had 1.5 times increased breast cancer risk, while those with higher DEHP levels had nearly 3 times increased risk. Analysis of breast tumor tissue revealed mutations in several genes known to respond to phthalate exposure, affecting pathways involved in hormones, metabolism, and cancer development. These findings suggest that exposure to certain phthalates may increase breast cancer risk through genetic changes, though larger studies are needed to confirm these results and understand how early-life exposures might contribute to cancer development later in life.
2020
Environ Int
This Taiwanese study of 239 women found that higher plasma levels of PFOS (a “forever chemical”) were associated with 134% increased breast cancer risk in women aged 50 and younger, with each natural log unit increase in exposure more than doubling the odds of developing the disease. Both PFOS and PFHxS (another PFAS chemical) showed positive associations specifically with estrogen receptor-positive breast tumors in younger women, suggesting these endocrine-disrupting chemicals may particularly affect hormone-sensitive breast cancers during reproductive years. These findings are concerning because PFAS are ubiquitous environmental contaminants found in water, food packaging, and consumer products, and the study adds to growing evidence that these persistent chemicals may contribute to rising breast cancer rates among younger women. The results highlight the potential health consequences of widespread PFAS contamination, particularly for women of reproductive age who may face elevated risk of hormone-driven breast cancers.
2019
Environ Int
A population-based study of 711 breast cancer cases and 598 controls from the Long Island Breast Cancer Study Project measured seven urinary phenol biomarkers (environmental endocrine disruptors from personal care and consumer products) in spot urine samples collected within three months of diagnosis, with 17.6-year median follow-up identifying 271 deaths including 98 from breast cancer. The highest versus lowest quintiles of methylparaben, propylparaben, and sum of parabens (Σparabens) were associated with 31-50% increased breast cancer risk (ORs: 1.31-1.50) but paradoxically with 23-32% reduced all-cause mortality after diagnosis (HRs: 0.68-0.77), with associations for incidence stronger among women with BMI <25 kg/m² and associations for mortality stronger among women with BMI ≥25 kg/m². These findings—the first to examine phenol biomarkers in relation to both breast cancer incidence and subsequent mortality—reveal complex differential associations suggesting that select parabens may increase risk of developing breast cancer but be associated with better survival outcomes, though the mechanisms underlying these paradoxical associations remain unclear and may relate to BMI-dependent metabolic or hormonal factors, reverse causation, or unmeasured confounding.
2024
Front Public Health
DDT, a highly persistent organochlorine pesticide comprising mainly p,p’-DDT (77%) and o,p’-DDT (15%), was widely used in agriculture and disease vector control with India being the primary consumer for malaria and leishmaniasis control, though global usage declined from ~5,388 metric tons annually (2001-2007) to ~3,772 metric tons (2008-2014) following the Stockholm Convention. As a xenoestrogen that bioaccumulates in fatty tissues and breast milk, DDT disrupts the endocrine system and enters the human circulatory system, causing reproductive toxicity, increased cancer risk (particularly threatening infants consuming contaminated breast milk), and carcinogenic effects, while also devastating wildlife populations through eggshell thinning in birds like pelicans and eagles. Prolonged DDT exposure causes cumulative toxicity that can alter morphogenesis, induce cancer, and cause reproductive system failure, yet its exceptional persistence and resistance to biodegradation means it continues to accumulate in the food chain and pose ongoing health threats despite reduced usage.
2024
J Hazard Mater
A study analyzing 162 non-alcoholic beverages found that 63 endocrine-disrupting chemicals (EDCs) were present in 144 products, with concentrations highest in metal-canned beverages and significantly lower or absent in glass, plastic, and carton packaging. Bisphenol A (BPA) levels were notably elevated in canned drinks compared to identical products from the same manufacturers packaged in glass or plastic, and researchers identified two previously unknown BPA structural isomers in beverages for the first time. The calculated daily BPA exposure from average beverage consumption (364 mL/day) exceeded the European Food Safety Authority’s revised safety guideline by up to 2,000-fold, suggesting that regular consumption of canned non-alcoholic beverages—particularly by young children—poses a potential health hazard due to EDC exposure from packaging materials.
2023
Reprod Toxicol
A review of epidemiologic literature examining environmental chemical exposures during pregnancy and three maternal health outcomes (preeclampsia, gestational diabetes, and breast cancer) found that pregnancy represents a unique critical period when biological changes can heighten women’s susceptibility to chemicals from air, food, water, and consumer products—including flame retardants, plasticizers, pesticides, and lead—though research has disproportionately focused on fetal outcomes rather than maternal health risks, which remain poorly characterized for most chemicals. While evidence shows that lead exposure increases risk of pregnancy-induced hypertensive disorders and pregnancy can amplify women’s vulnerability to environmental chemicals, variations in study design, exposure assessment methods, and inconsistent adjustment for confounders limited comparability across studies. The authors emphasize that future research must recognize pregnancy as a critical window for women’s lifelong health, calling for incorporation of biomarkers of exposure and effect, deliberate timing and methods of measurement, and consistent confounder adjustment to strengthen understanding of the pregnancy exposome and its impacts on maternal health outcomes beyond the immediate postpartum period.
2023
Environ Sci Technol
The following study discusses a strategic framework to improve how chemicals are managed in North America. The Essential-Use Approach is a policy that prioritizes restricting the use of chemicals based on necessity and safety. It proposes three guiding questions: Is the chemical essential to the product’s function? Is it the safest option? Is it necessary for health and safety? They also prioritize speed of assesments so that chemicals can be quickly phased out if evidence suggests danger to human health. This study is a call for change and aims to become a tool to simplify decision-making for regulating organizations, help businesses avoid liability related to harmful chemicals, and ultimately improve public health by ensuring only the safest substances are used in consumer products.
2023
Chemosphere
A community-based intervention study (REDUXE) examined the effects of discontinuing paraben and phthalate-containing personal care products over 28 days by collecting paired fine needle aspirates of breast tissue from healthy volunteers before and after intervention, finding striking reversal of cancer-associated phenotypes including PI3K-AKT/mTOR pathway alterations, autophagy, and apoptotic signaling networks, along with significant reductions in urinary paraben and phthalate metabolites. Post-intervention breast tissue showed “normalizing” changes in estrogen-modulated gene expression pathways, estrogen receptor alpha:beta ratios, and cell cycle S-phase fraction when treated with 17β-estradiol in vitro, demonstrating functional improvement in cellular responses. This paradigm-shifting study reveals that persistent exposure to xenoestrogens from daily-use personal care products produces unfavorable pro-carcinogenic cellular changes in human breast tissue that can be reversed through short-term avoidance, suggesting that reducing xenoestrogen exposure from consumer products may suppress cancer-promoting phenotypes and represents a viable approach for breast cancer prevention.
2023
Environ Sci Technol
This review investigates the migration of bisphenols and alternative color developers from thermal labels on cling-wrapped fresh food, identifying them as significant dietary sources of these compounds. While no BPA was found in packaging, high concentrations of bisphenol S (BPS) and other alternatives were detected, particularly in thermal labels. Migration studies revealed that BPS and related compounds leach into food, especially fish, raising potential health concerns. These findings highlight the need for further risk assessments regarding these alternative chemicals in food packaging due to past findings about BPA being an endocrine disruptor. This will help mitigate exposure risks and ensure consumer safety.
2022
J Expo Sci Environ Epidemiol
A comprehensive analysis of 6,793 chemicals in commercial use identified 50 high-priority understudied chemicals that frequently co-occur with known breast cancer-associated chemicals in everyday exposure sources like food, consumer products, and personal care items. Using chemical databases and structural similarity analyses, researchers found these understudied chemicals share physicochemical properties with established mammary carcinogens and potential endocrine disruptors, yet have not been adequately evaluated for breast cancer risk. The findings highlight that real-world chemical exposures occur as mixtures rather than isolated compounds, and that focusing solely on individual well-known chemicals may miss important combination effects—underscoring the urgent need for mixtures-based research in clinical, epidemiological, and toxicological studies to better understand and prevent environmentally-driven breast cancer.
2022
Molec Carcinogen
A case-control study of 708 breast cancer patients and 598 controls from Long Island found that paraben exposure—particularly methylparaben—was associated with significantly increased breast cancer risk among women with hypomethylated (undermethylated) DNA, showing a 46% increased risk in the highest versus lowest exposure group and a 32% increased risk per one-quantile increase in combined paraben exposure. Importantly, paraben exposure was specifically associated with breast tumors characterized by hypomethylation of the CCND2 gene promoter, with methylparaben showing a 25% increased risk and combined parabens showing a 55% increased risk for this tumor subtype. These findings suggest that parabens—ubiquitous preservatives in personal care products—may contribute to breast cancer development through epigenetic mechanisms, particularly in women with pre-existing DNA methylation abnormalities, identifying a potentially vulnerable subpopulation and a specific molecular pathway through which these chemicals may promote carcinogenesis.
2019
Environ Int
A systematic review of 342 peer-reviewed articles covering 202 unique chemicals used in consumer products analyzed exposure pathways, functional uses, product applications, exposure routes, and associated health risks, finding that phthalates, bisphenol-A, and polybrominated diphenyl ethers were the most frequently studied chemicals, with frequently reported uses including plasticizers, polymers/monomers, and flame retardants in food contact materials, personal care products, cosmetics, furniture, flooring, and electronics. The analysis revealed that publication volume on chemicals tends to surge following major regulatory changes or exposure incidents rather than before market introduction, indicating a reactive rather than proactive approach to chemical safety assessment. These findings highlight the critical gap between the increasingly diverse array of chemicals used in consumer products and our lagging understanding of their exposure pathways and human health risks, emphasizing the urgent need to develop capacity and mechanisms for identifying health risks prior to chemical releases rather than after exposure incidents or regulatory action, to enable preventive rather than reactive public health protection.
2019
PLOS One
Bisphenol AF (BPAF)—a chemical increasingly used to replace BPA in consumer products—shows even stronger estrogen-like effects than BPA and promotes the growth of estrogen receptor-positive (ER+) breast cancer cells through multiple hormone signaling pathways. Laboratory studies revealed that BPAF stimulates cancer cell proliferation by activating estrogen receptors and upregulating AREG, a growth-promoting gene, with blocking either estrogen receptors or AREG preventing BPAF’s cancer-promoting effects. These findings challenge the assumption that BPA alternatives are safer, demonstrating that BPAF may pose equal or greater breast cancer risks than the chemical it’s replacing, and highlight the urgent need for human studies to assess BPAF’s impact on breast cancer risk before its continued widespread use in products marketed as “BPA-free.”
2019
Environ Res
This study investigated how DEHP (a common plastic additive) and its metabolite MEHP affect breast cancer-related markers in T-47D breast cancer cells exposed to various concentrations for 4 days. The researchers found that high-dose DEHP (10,000 nM) and low-dose MEHP (0.1 nM) significantly increased cell proliferation without causing cell death, and DEHP also increased progesterone receptor (PR) protein levels and nuclear accumulation. When cells were treated with a progesterone receptor blocker (Mifepristone), the increased cell growth was completely prevented and PR nuclear levels were partially reduced, indicating that DEHP promotes breast cancer cell proliferation through progesterone receptor activation. The findings suggest that DEHP exposure may increase breast cancer risk by activating progesterone signaling pathways, though the exact mechanisms and long-term consequences require further investigation.
2019
Environ Pollut
This study investigated how three endocrine-disrupting chemicals (BPA, BBP, and DEHP) affect estrogen receptor alpha (ERα) activity under normal and low-oxygen (hypoxic) conditions in breast and endometrial cancer cells. The researchers found that BPA and BBP activated ERα at specific concentrations, while DEHP did not, but all three chemicals enhanced ERα-mediated gene activity and decreased ERα protein levels under hypoxic conditions. BPA and BBP also affected hypoxia-related factors, decreasing hypoxia-inducible factor-1 activity while increasing VEGF (a blood vessel growth factor) secretion in breast cancer cells, whereas DEHP had different effects. The findings suggest that these endocrine disruptors can alter ERα regulation under low-oxygen conditions, which may influence disease processes since hypoxia is common in tumors and other pathological states.
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.
2018
Mol Cell Endocrinol
A review examining parabens—one of the most widely used preservatives worldwide in foods, cosmetics, and pharmaceuticals—found that these easily absorbed chemicals are classified as endocrine-disrupting chemicals (EDCs) that can disrupt hormonal homeostasis and cause multidirectional health implications affecting body fitness and function. The review summarizes current literature on paraben properties, occurrence, metabolism, and particularly their influence on the human endocrine system, emphasizing the importance of assessing their safety given their ubiquitous use and absorption. With parabens now recognized as EDCs capable of disrupting endocrine function, the authors highlight concerns about widespread population exposure through everyday consumer products and the need for precise assessment of their health impacts on human physiology.
2018
Environ Int
A study of 54 female cashiers in South Korea found that handling thermal paper receipts without gloves doubled their urinary BPA levels during work shifts, but wearing gloves completely prevented this increase in exposure. Higher BPA levels were associated with elevated fasting insulin and insulin resistance, markers of metabolic dysfunction that can lead to diabetes and cardiovascular disease. The findings demonstrate that cashiers face significant occupational BPA exposure from receipt handling and that simple protective measures like wearing gloves can effectively eliminate this exposure route, offering an immediate and practical intervention to protect workers’ health.
2015
Environ Health Perspect
This study investigates how low concentrations of Bisphenol A (BPA) affect DNA integrity and cell proliferation in breast cells, focusing on the involvement of the oncogene c-Myc. They found that exposure to low doses of BPA resulted in significant DNA damage in estrogen receptor-alpha (ERα)-negative mammary cells, meaning that BPA can promote cancer in ways independent of standard estrogen receptor pathways. Additionally, BPA exposure led to the upregulation of c-Myc, which is a gene known to regulate cell proliferation and death., and the study did observe enhanced proliferation of ERα-negative mammary cells upon BPA exposure. This suggests that BPA may promote cancer pathways through c-Myc activation. This was then confirmed when the researchers silenced c-Myc gene expression and found that oncogenic effects in the presence of BPA were decreased. Overall, these findings raise concerns about BPA’s potential role in breast cancer formation, even at low exposure levels.
2013
Green Chemistry
Scientists have developed TiPED (Tiered Protocol for Endocrine Disruption), a voluntary five-tier testing system designed to help chemists identify hormone-disrupting properties in new chemicals during the design phase—before they enter consumer products—ranging from computer-based predictions to cell and animal studies. The protocol was created by experts in green chemistry and environmental health to broadly test whether new chemicals can mimic or block hormones or interfere with hormone signaling, which is critical for preventing endocrine disruption that can contribute to diseases like breast cancer. Testing of six known endocrine disruptors with different mechanisms of action successfully identified all of them, demonstrating the protocol’s effectiveness, though the system will continue evolving as scientific understanding advances. This tool represents an important shift toward preventing chemical hazards at the design stage rather than discovering them years later after widespread human exposure, which could significantly reduce public health risks including 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.
2022
Metabolites
This study used advanced mass spectrometry to track how the pesticide chlorpyrifos breaks down in wheat plants after being sprayed during the flowering stage, finding that chlorpyrifos residues decreased relatively quickly (with a half-life of 2-5 days) across different plant parts. The pesticide metabolizes into 3,5,6-trichloro-2-pyridinol (3,5,6-TCP), a potentially harmful compound that initially increases in wheat tissues before gradually degrading, peaking 3-11 days after application. The researchers recommend that 3,5,6-TCP be included in food safety regulations and dietary risk assessments because it persists in wheat and poses potential health threats to humans and animals. This finding is particularly important for establishing appropriate waiting periods between pesticide application and harvest to minimize consumer exposure.