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2023
Biol Trace Elem Res
This cross-sectional analysis from the 2007–2016 National Health and Nutrition Examination Survey (NHANES) explored the relationship of urinary concentrations of heavy metals and breast cancer. 3,352 U.S. women (aged 20 or older) in the were included in the analysis. 106 reported a history of breast cancer (weighted prevalence ~ 3.1%). Researchers measured urinary concentrations of heavy metals — cadmium, lead, and mercury — corrected for creatinine, then applied multivariate logistic regression to assess associations with prevalent breast cancer. They found that women in the highest quartile of urinary lead (≥ 0.71 µg/g creatinine) had significantly elevated odds of prior breast cancer (OR = 2.95, 95% CI: 1.13–7.70) compared with those in the lowest quartile; by contrast, urinary cadmium and mercury showed no statistically significant associations. The findings suggest that among common endocrine-disrupting metals, lead exposure — as measured by urinary biomarkers — may be linked with increased breast cancer prevalence in U.S. women.
2019
Epidemiol
A large US study of nearly 51,000 women found that exposure to airborne toxic metals, particularly mercury, cadmium, and lead, was associated with increased postmenopausal breast cancer risk, with mercury showing the strongest effect at 30% increased risk for the highest exposure levels. When examining the combined effect of 10 different airborne metals together, the mixture was associated with elevated postmenopausal breast cancer risk, with mercury, lead, and cadmium contributing most to this increased risk. These findings suggest that environmental exposure to toxic metals through air pollution may be an important and underrecognized risk factor specifically for breast cancer in postmenopausal women.
2024
J Clin Endocrinol Metab
A longitudinal study of 549 women with 2,252 repeated anti-Müllerian hormone (AMH) measurements over the 10 years preceding final menstrual period found that elevated arsenic levels were associated with a 32.1% decline in AMH concentrations and elevated mercury levels with a 40.7% decline over the decade, while elevated cadmium and mercury showed significant per-year declines of 9.0% and 7.3% respectively. The findings indicate that higher exposure to heavy metals—particularly arsenic, cadmium, and mercury—is correlated with accelerated depletion of ovarian reserve (remaining viable eggs) in women approaching menopause. This study suggests that environmental heavy metal exposure may contribute to earlier reproductive aging and diminished ovarian function.
2022
Toxicol Rep
This study focused on arsenic (As) and lead (Pb) being in baby foods due to their known health risks, such as developmental, reproductive, and carcinogenic effects. Arsenic exposure comes mainly from rice-based products and could cause significant health risks. Lead was found in some grains and root vegetables, indicating potential exposure to health effects. The study concluded that exposure to these metals from baby foods had been found to be at safe levels. However, an exception was made for rice products because of arsenic natural abundance in soil. Even though levels of these metals in baby foods have been found to be under safe levels, monitoring of infant food should be continued for these metals and others.