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2025
J Occup Environ Med
A French case-control study of 1,230 breast cancer patients and 1,315 controls examined occupational exposure to 49 common workplace chemicals and found elevated breast cancer risk associated with 12 agents. Women with the highest cumulative exposure showed increased risk ranging from 33% to 139% for chemicals including synthetic and natural fibers, plastics, organic dyes, nitrogen oxides, anesthetic gases, and various industrial compounds. The associations were generally stronger in premenopausal women compared to postmenopausal women. These findings suggest certain occupational exposures may play a role in breast cancer development, though larger studies with more detailed exposure assessments are needed to confirm these results.
2025
Environ Health Perspect
An updated analysis of the largest cohort of ethylene oxide (EtO)-exposed workers—7,549 women employed ≥1 year at 13 U.S. facilities followed from 1960-2021 (181 breast cancer deaths)—found that cumulative EtO exposure was strongly associated with elevated breast cancer mortality, with workers accruing 3,650 ppm-days of exposure (equivalent to 10 years at 1 ppm) having over three times the breast cancer death rate compared to unexposed workers (RR = 3.15; 95% CI: 1.78-5.60) using a 20-year lag model. This association remained robust in a subcohort with interview data on breast cancer risk factors after matching on potential confounders (RR = 3.22; 95% CI: 1.52-7.13), with evidence of variation by time since exposure and exposure rate. These findings provide strong evidence that EtO is a human breast carcinogen and support recent emission reduction proposals, raising serious public health concerns given the high prevalence of breast cancer, large numbers of occupationally exposed workers, and potential for widespread environmental exposure from industrial facilities, with elevated risks observed even in low exposure ranges highlighting the need for stringent exposure controls and environmental monitoring.
2024
Eur J Cancer
A French study of over 5,400 women found a suggested 28% increased risk of breast cancer associated with long-term exposure to fine particulate matter (PM2.5) air pollution for each 10 µg/m³ increase in average concentration, though this association did not reach statistical significance, with weaker trends also observed for PM10 and nitrogen dioxide (NO2). This study uniquely examined air pollution exposure at both residential and workplace locations, finding that residential and workplace pollution levels were highly correlated, suggesting that residential exposure assessments can serve as a reasonable proxy for total pollution exposure. The findings contribute to growing evidence linking air pollution to breast cancer risk and suggest that future research should also consider exposure during commuting to capture complete pollution exposure patterns.
2024
Med Lav
A meta-analysis of 23 cohort and case-control studies found that occupational benzene exposure was associated with an 8% increased breast cancer risk overall, with high-level benzene exposure showing a stronger 35% increased risk. The association was consistent for cancer incidence (8% increased risk) though not statistically significant for cancer mortality, and significant heterogeneity was detected across studies based on sex, publication year, study design, quality, and industry of employment. These findings suggest that benzene—a recognized carcinogen primarily studied in relation to leukemia—may also increase breast cancer risk in occupationally exposed workers, though the authors acknowledge that bias, confounding factors, and publication bias limit the strength of causal inference, highlighting the need for high-quality prospective studies with detailed exposure assessment to confirm these associations and inform workplace safety standards for the millions of workers potentially exposed to benzene in petroleum, chemical manufacturing, automotive repair, and other industries.
2024
Environ Res
This large Danish study of over 5,500 breast cancer cases found that daughters whose mothers worked in horticulture (greenhouse and nursery work) before conception or during pregnancy had significantly increased breast cancer risk—79% higher for estrogen receptor-positive tumors and 148% higher for estrogen receptor-negative tumors. The associations were particularly strong for maternal horticulture work compared to paternal work, suggesting that pesticide and chemical exposures during critical windows of fetal development may affect daughters’ breast cancer risk decades later. These findings are concerning because horticultural workers have high exposure to pesticides and other agricultural chemicals, and the study suggests that even preconceptional maternal exposure—before pregnancy begins—may influence a daughter’s future cancer risk, highlighting the potential for intergenerational effects of occupational chemical exposures.
2023
Environ Res
This case-control study of 5587 women with breast cancer and age-matched controls for which there was data on maternal employment. Maternal occupational exposure to diesel exhaust (OR=1.13, 95%CI,1.01-1.27) and bitumen fumes (OR=1.51., 95%CI,1.00-2.26) was associated with breast cancer. Further, exposures to diesel exhaust (OR=1.23, 95%CI, 1.01-1.50) were more strongly associated with ER- tumors than with ER+ tumors.
2023
Asian Pac J Cancer Prev
A study of 360 participants found that agricultural workers exposed to pesticides who carry genetic variations that impair their body’s ability to detoxify chemicals (null mutations in GSTT1 and GSTM1 genes) had substantially increased cancer risk, with 4-7 times higher odds of developing lymphoma or breast cancer compared to those with normal detoxification genes. The study also found elevated markers of oxidative stress (cellular damage) in farm workers with these genetic variants who developed leukemia, suggesting that pesticide exposure combined with impaired detoxification capacity triggers cancer development. These findings indicate that certain genetic profiles make agricultural workers particularly vulnerable to pesticide-related cancers, highlighting the importance of protective measures for farm workers and potential genetic screening to identify high-risk individuals.
2023
Environ Int
This cohort study examined associations of metals to multiple cancer sites. Participants were from a cohort study of worker from the French national energy company who lived in semi-urban or rural locations. The researchers estimated metal exposures from moss biomonitoring (part of a larger effort to measure air pollution). Estimated exposures to metals were associated any cancer (bladder, lung, breast or prostate), but no estimated exposures were associated with breast cancer alone. Some estimates appraoched HR >1 for breast cancer.
2022
Environ Sci Poll Res
This meta-analysis of 24 studies found that women occupationally exposed to organic solvents (chemicals used in manufacturing, cleaning, and industrial processes) had an 18% increased risk of breast cancer compared to unexposed workers, with the association being particularly strong in postmenopausal women (35% increased risk) and European workers. Organic solvents are commonly found in workplaces involving paint, adhesives, dry cleaning, and manufacturing, and the increased risk was consistent across both large cohort studies and case-control studies. These findings suggest that workplace exposure to organic solvents is an important and preventable occupational health hazard that contributes to breast cancer risk, especially for women working in industries that regularly use these chemicals.
2022
Environ Res
A study of 6,247 greenspace workers (landscapers, gardeners, groundskeepers) from the French AGRICAN cohort found significantly elevated cancer risks compared to farmers and non-agricultural workers. Male greenspace workers showed 15% higher overall cancer incidence, with particularly elevated risks for prostate cancer (21% increase), thyroid cancer (184% increase), testicular cancer (298% increase), and skin melanoma (115% increase), while female greenspace workers had a 71% increased risk of breast cancer. The study also found that greenspace workers reported more allergic diseases and, among males, more depression compared to other occupational groups. These findings highlight that greenspace workers face distinct occupational health risks, likely related to pesticide exposure and other workplace hazards, and should be studied separately from agricultural workers rather than being grouped together in research.
2021
Cancer Epidemiol Biomarkers Prev
A Spanish case-control study of 1,738 breast cancer cases and 1,910 controls found that occupational heat exposure was associated with a 22% increased risk of breast cancer among women who had ever been exposed. The study found significant dose-response relationships, with risk increasing with both cumulative heat exposure and duration of exposure, and particularly strong associations for hormone receptor-positive breast cancer (38% increased risk). The associations were strongest when not adjusted for detergent exposure, suggesting potential confounding or interaction between these workplace exposures. These findings suggest that chronic workplace heat stress may be a previously underrecognized occupational risk factor for breast cancer, though further research is needed to confirm these results and understand potential interactions with other workplace exposures.
2021
Scand J Work Environ Health
This large Danish study of over 38,000 women with breast cancer found that occupational exposure to diesel exhaust was associated with a modestly increased risk of estrogen receptor-negative breast tumors in women under age 50, with the risk increasing with longer duration and higher levels of exposure. No significant associations were found for overall breast cancer risk or for exposure to polycyclic aromatic hydrocarbons (PAHs). These findings suggest that workplace diesel exhaust exposure may be particularly relevant for early-onset, harder-to-treat forms of breast cancer, highlighting the importance of protecting workers from diesel fumes.
2020
Int Arch Occup Environ Health
This Swedish study of 2,400 postmenopausal women found that those exposed to chemicals in the workplace had a 59% increased risk of breast cancer, with the risk increasing with longer duration of exposure. Women exposed to chlorinated hydrocarbon solvents or oil mist for more than 10 years had approximately triple the breast cancer risk compared to unexposed women. The study used individualized exposure assessments based on specific work tasks rather than just job titles, providing stronger evidence that workplace chemical exposures—particularly to organic solvents and oil mist commonly found in manufacturing and industrial settings—may be important contributors to breast cancer risk.
2019
Occ Environ Med
This Canadian study of over 2,200 women found that occupational exposure to polycyclic aromatic hydrocarbons (PAHs)—chemicals released from burning materials like coal, oil, and gasoline—increased breast cancer risk by 32%, with higher risks seen in women exposed to high levels for more than 7 years. The association was particularly strong among women with a family history of breast cancer, where prolonged high exposure nearly tripled the risk. These findings suggest that workplace PAH exposure may be an important and preventable breast cancer risk factor, especially for women with genetic susceptibility to the disease.
2019
J Work Environ Health
A prospective study of 16,084 Swedish women found that occupational exposure to chemicals was associated with a 26% increased risk of postmenopausal breast cancer, with risk increasing based on duration of exposure. Women exposed to diesel exhaust for more than 10 years showed a 69% increased risk, while exposure to organic solvents showed a non-significant elevated risk. The researchers estimated that occupational chemical exposures accounted for 2% of all breast cancer cases in this population, highlighting workplace chemical exposure as a potentially important but often overlooked risk factor for breast cancer.
2019
Environ Int
This population-based case-control study investigated whether occupational exposure to alkylphenolic compounds—endocrine-disrupting chemicals widely used in industry—is associated with breast and prostate cancer. The study included over 5,600 participants and found that occupational exposure to alkylphenolic compounds was modestly associated with increased breast cancer risk (23% increase), particularly from exposure to domestic cleaning products and nonylphenol ethoxylates. No significant associations were found between alkylphenolic compound exposure and prostate cancer overall, except among men exposed through cosmetics and personal hygiene products. The authors conclude these findings suggest a modest link between occupational alkylphenolic compound exposure and breast cancer that requires further confirmation in additional studies.
2018
Scand J Work Environ Health
A European multicenter case-control study of 104 male breast cancer cases and 1,901 controls found that high cumulative lifetime exposure to trichloroethylene (>23.9 ppm-years) was associated with a 110% increased male breast cancer risk compared to non-exposure, with the association persisting when only exposures occurring 10 or more years before diagnosis were considered, indicating a true latency effect. The study also suggested possible roles for benzene and ethylene glycol in male breast cancer risk, though no clear dose-response relationships were observed for these chemicals. These findings are particularly important given that male breast cancer is rare, often diagnosed at later stages, and has worse prognosis than female breast cancer, and they add to evidence that occupational solvent exposures—particularly trichloroethylene used in metal degreasing, dry cleaning, and industrial cleaning—may be underrecognized risk factors for breast cancer in both men and women, warranting stricter workplace exposure limits and enhanced surveillance of workers in high-exposure industries.
2018
Am J Epidemiol
A cohort study of 4,503 female autoworkers in Michigan exposed to metalworking fluids (MWFs)—oil and chemical mixtures used in metal manufacturing—found that increased exposure to straight mineral oil MWFs was associated with a 13% increased breast cancer risk per interquartile range increase in cumulative exposure. Among younger women who developed premenopausal breast cancer, exposure to synthetic MWFs (chemical lubricants without oil) showed elevated risk, suggesting potentially different carcinogenic mechanisms in younger versus older women. This occupational study addresses a critical gap in breast cancer research by providing quantitative exposure-response data for a specific chemical mixture affecting a large workforce, offering one of the few leads on modifiable environmental risk factors for breast cancer.
2000
Am J Indust Med
This Danish nationwide study of 230 male breast cancer cases found that men occupationally exposed to gasoline and its combustion products had a 2.5 times higher risk of breast cancer, with the risk rising to 5.4 times higher among men first exposed before age 40. Gasoline contains several known carcinogens including benzene and produces cancer-causing combustion products, which may explain this elevated risk. Since male breast cancer is rare but shares similar biology with female breast cancer, these findings suggest that gasoline exposure may also increase breast cancer risk in women and warrant further investigation in female workers.
2024
Ecotoxicol Public Health
A case-control study of 758 women in southwestern Paraná, Brazil—a region with intensive pesticide use and 41% higher breast cancer rates than the national average—found that even women not working in fields but handling contaminated equipment and laundry tested positive for Glyphosate, atrazine, and 2,4-D. While the overall breast cancer risk association with pesticide exposure was non-significant after adjustment (OR = 1.30), exposed women had significantly higher risk of lymph node metastasis (OR = 2.19; 95% CI: 1.31-3.72), indicating more aggressive disease. These findings suggest pesticide exposure in agricultural communities may be associated with development of more aggressive breast cancer, highlighting the need for monitoring both occupational and household pesticide exposure in rural populations.
2023
Ann Agric Environ Med
A case-control study of 111 postmenopausal women with breast cancer and 111 controls found that shift work was associated with a 165% increased breast cancer risk, but this risk was dramatically amplified by body weight status. Overweight shift workers showed a staggering 884% increased breast cancer risk compared to normal-weight women who had never worked shifts, indicating a powerful synergistic effect between shift work and excess body weight. With 72% of breast cancer cases having a history of shift work compared to 49% of controls, these findings suggest that the combination of circadian disruption from shift work and metabolic dysfunction from excess weight creates a particularly high-risk scenario, highlighting the urgent need for targeted prevention strategies—including weight management and lifestyle interventions—specifically for women working non-standard hours.
2022
J Occup Environ Med
A systematic review and meta-analysis of 9 studies found that female flight attendants had a 43% increased breast cancer incidence compared to the general population, but surprisingly, neither cosmic radiation exposure nor circadian rhythm disruption—the two primary occupational hazards hypothesized to drive this excess risk—showed clear associations with breast cancer in the available studies. Three studies suggested a possible link with cosmic radiation while none found associations with circadian disruption, leaving the underlying cause of the elevated breast cancer risk among flight attendants unexplained. These findings highlight a critical gap in occupational health research: while flight attendants clearly face elevated breast cancer risk, the mechanisms remain unclear, potentially involving unmeasured factors such as reproductive patterns (delayed childbearing, fewer children), lifestyle factors associated with the profession, cumulative effects of multiple low-level exposures, or limitations in exposure assessment methods—underscoring the urgent need for studies with detailed individual-level data on occupational exposures, work schedules, and lifestyle factors to identify modifiable risk factors for this vulnerable workforce.
2022
Int Arch Occup Environ Health
A nationwide retrospective cohort study of over 4.7 million Taiwanese workers found that occupational exposure to specific hazardous chemicals was associated with significantly elevated breast cancer risk among female workers, with asbestos showing the highest increase (107% increased incidence, 80% increased risk after adjusting for age and exposure duration). Other notable associations included 1,1,2,2-tetrachloroethane (74% increased incidence, 52% adjusted risk increase), trichloroethylene/tetrachloroethylene (47% increased incidence, 42% adjusted risk increase), benzene (40% increased incidence, 38% adjusted risk increase), and lead (27% increased incidence, 31% adjusted risk increase), with associations remaining robust even after accounting for 2- or 5-year latency periods. These findings from 3,248 breast cancer cases among exposed workers provide compelling evidence that occupational chemical exposures substantially increase breast cancer risk, highlighting the urgent need for enhanced workplace protections, regular breast cancer screening programs for exposed workers, substitution of safer alternatives where possible, and recognition of breast cancer as an occupational disease for workers with documented exposure to these carcinogens.
Risk of breast cancer in Danish women occupationally exposed to organic solvents, including ethanol.
2022
Am J Indust Med
A Danish nested case-control study of 845 breast cancer patients and 1,500 matched controls found that occupational exposure to organic solvents was associated with a 220% increased breast cancer risk among ever-exposed women compared to never-exposed women. The elevated risk was observed across all breast cancer subtypes—both estrogen receptor-positive and negative tumors—and in both pre- and postmenopausal women, though surprisingly, no dose-response relationship was detected with duration or cumulative exposure levels. Occupational ethanol exposure showed no association with breast cancer, suggesting that specific properties of other organic solvents may drive the carcinogenic effect, and highlighting the need for workplace protections and further research to identify which solvent types pose the greatest risk.
2022
Int J Env Res Public Health
A large population-based retrospective case-control study in Taiwan examined 103,047 female workers with breast cancer diagnosed between 2008-2017 and matched controls (1:4 ratio) using lifetime labor enrollment records from 1950-2017 to investigate the association between occupational industries and breast cancer risk. The study identified slightly elevated breast cancer risk across nine major occupational classifications, with the highest risks observed in education (OR: 1.199), professional/scientific/technical activities (OR: 1.118), human health and social work (OR: 1.125), and financial/insurance activities (OR: 1.109), while manufacturing, wholesale/retail trade, information/communication, real estate, and public administration sectors showed smaller but statistically significant increases (ORs ranging from 1.027-1.074). The findings suggest that women employed in certain white-collar professions (education, healthcare, finance, professional services) and some industrial sectors (manufacturing, retail) have modestly increased breast cancer risk compared to other Occupations. The authors recommend further investigation into specific risk factors within these industries—such as work schedules, occupational exposures, socioeconomic factors, or lifestyle patterns associated with these professions—that might explain the slightly elevated breast cancer incidence among female workers in these sectors.
2021
Ocup Environ Med
A large Danish registry-based case-control study of 38,375 women under age 70 with primary breast cancer and matched controls used objective lifetime employment histories from the Danish Supplementary Pension Fund Register and a job exposure matrix to assess occupational ultraviolet radiation (UVR) exposure as a reliable measure of long-term solar UVR exposure. While no overall association was observed between occupational UVR exposure and breast cancer risk, among women aged ≥50 years, longer duration of UVR exposure (≥20 years: OR=0.83; 95% CI: 0.75-0.92) and highest cumulative exposure (OR=0.89; 95% CI: 0.83-0.95) were inversely associated with breast cancer risk, with no notable differences by estrogen receptor status. These findings suggest that long-term occupational UVR exposure may protect against late-onset breast cancer, supporting the hypothesis that solar UVR (likely through vitamin D production) may have protective effects on breast cancer development, particularly in postmenopausal women, though the mechanism requires further investigation in future occupational studies with objective exposure assessment.
2019
Breast Cancer Res Treat
A case-control study within the MCC-Spain cohort examined 1,389 invasive breast cancer cases and 1,712 controls aged 20-85 years to investigate domain-specific associations between physical activity and breast cancer risk by menopausal status and molecular subtype. The study found unexpected results: occupational physical activity (OPA) intensity was associated with higher breast cancer risk, particularly for premenopausal women (OR = 1.89 for active/very active vs. sedentary jobs) and ER+/PR+, HER2- tumors (OR = 1.80), while sedentary time ≥6 hours/day increased postmenopausal breast cancer risk by 69%; conversely, moderate-to-high intensity household and recreational physical activity above 1,000 MET·min/week reduced breast cancer risk by 14-33% in both pre- and postmenopausal women. These findings reveal important distinctions between types of physical activity: while leisure-time and household physical activity provide protective benefits against breast cancer, occupational physical activity paradoxically showed positive associations with breast cancer risk—particularly for hormone receptor-positive tumors—which may reflect different biological mechanisms, exposure patterns, or confounding factors associated with Occupation. The study highlights that sitting time is an independent breast cancer risk factor regardless of other physical activity, and the surprising positive association between occupational physical activity and ER+/PR+ breast cancer warrants further investigation to understand underlying mechanisms.
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.