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2024
Cancer Epidemiol
A Canadian case-control study of 465 young women (ages 18-45) with breast cancer and 242 controls found that residential exposure to air pollution was strongly associated with increased breast cancer risk. For each interquartile range increase in nitrogen dioxide (NO₂) exposure—a traffic-related pollutant—women had a 133% increased risk of breast cancer at their current residence and a 116% increased risk based on exposure five years earlier. The findings suggest that traffic-related air pollution may be a particularly important and underrecognized breast cancer risk factor in younger women.
2019
Int J Env Res Pub Health
This Brazilian case-control study of 351 women in an intensive agricultural region found that women living near cropland where pesticides are used had more than twice the risk of developing breast cancer compared to those who didn’t live near such areas. The study also found that women over 50 who experienced early menarche (first menstrual period at 9-12 years) had approximately double the breast cancer risk. These findings suggest that residential proximity to pesticide-treated agricultural land may be an important environmental risk factor for breast cancer, adding to concerns about pesticide exposure beyond just occupational settings or dietary intake.
2018
Environ Health
This longitudinal study examined how exposure to endocrine disrupting chemicals (EDCs) affects the timing of menarche in Chilean girls by measuring 26 phenol and phthalate compounds in urine samples collected before breast development and during adolescence. The researchers found that different chemicals had varying effects depending on when exposure was measured: higher early exposure to DEHP was associated with later menarche, while early exposure to certain phenols and later exposure to some phthalates were linked to earlier menarche. The study also revealed that body weight influenced these effects, with overweight or obese girls showing earlier menarche when exposed to higher levels of certain chemicals like triclosan, while normal-weight girls did not show this association. These findings demonstrate that specific EDCs can disrupt normal sexual development in girls, with timing of exposure and body weight being important factors.
2018
Environ Res
A Chinese case-control study of 209 breast cancer patients and 165 controls found that women with the highest levels of PBDE flame retardants in their adipose tissue had dramatically elevated breast cancer risk, with some congeners showing 447% to 545% increased risk in the highest exposure groups compared to the lowest. Most individual PBDE congeners—including BDE-47, BDE-99, BDE-100, BDE-209, and total PBDEs—were significantly higher in breast cancer cases than controls (median 95.0 vs 73.7 ng/g lipid) and showed strong dose-response relationships with increasing exposure levels. The associations remained robust for estrogen receptor-positive breast cancers and in multivariate models adjusting for age and reproductive factors, providing compelling evidence that PBDE exposure may play an important role in breast cancer development, particularly in populations with high environmental exposures to these persistent flame retardant chemicals.
2025
Clin Transl Oncol
A review of 29 studies found that breast cancer patients have distinct imbalances in their gut and breast tissue bacteria that vary based on cancer type, stage, menopause status, body weight, and physical activity, though no single bacterial profile has yet emerged as a reliable biomarker. The research suggests that gut microbiome composition may influence how well breast cancer treatments work, with some beneficial bacteria and their metabolites potentially improving therapy effectiveness or slowing tumor growth. These findings highlight the microbiome as a promising new area for developing personalized breast cancer treatments and improving outcomes, though more research is needed to identify specific bacterial targets and understand the underlying mechanisms.
2024
Environ Res
Endocrine Disrupting Chemicals (EDCs)—including bisphenol A, phthalates, parabens, pesticides, and heavy metals commonly found in pharmaceuticals, cosmetics, and packaging—are widespread environmental pollutants that interfere with the body’s hormone system. Research shows EDCs have harmful effects on women’s reproductive health, contributing to conditions such as endometriosis, polycystic ovary syndrome, uterine fibroids, premature ovarian failure, menstrual irregularities, and infertility. This review emphasizes the need for healthcare professionals to consider environmental exposures when evaluating patients, highlights potential mechanisms by which EDCs affect female reproduction, and discusses how nutritional interventions and stricter environmental regulations could help reduce EDC-related health risks. Understanding the link between EDCs and women’s health is crucial for developing protective strategies, informing treatment approaches, and shaping public policies to safeguard reproductive and overall well-being. The study seeks to advise that couples attempting to conceive should avoid endocrine disrupting chemicals (EDCs) such as BPA, pesticides, and phthalates. Following this advice is found to be crucial during the prenatal and periconceptional periods, where fetal development and growth are critical in this window.
2022
Int J Cancer
A comprehensive two-sample Mendelian randomization study using Breast Cancer Association Consortium data examined potential causal associations of 23 risk factors and biomarkers with breast cancer risk overall and by molecular subtypes, identifying significant associations for 15 traits including reproductive factors (age at menarche/menopause), anthropometric measures (BMI, waist-to-hip ratio, height), lifestyle factors (physical activity, smoking, sleep duration, chronotype), and six blood biomarkers (estrogens, IGF-1, SHBG, telomere length, HDL-cholesterol, fasting insulin). Notably, the study revealed heterogeneous subtype-specific associations: increased SHBG reduced ER+ breast cancer risk (OR=0.83; 95% CI: 0.73-0.94) but elevated risk for ER- (OR=1.12) and triple-negative cancers (OR=1.19, p-heterogeneity=0.01), while higher fasting insulin increased HER2-negative cancer risk (OR=1.94; 95% CI: 1.18-3.20) but reduced HER2-enriched cancer risk (OR=0.46; 95% CI: 0.26-0.81, p-heterogeneity=0.006). These findings—consistent across sensitivity analyses—provide strong genetic evidence for causal relationships between multiple modifiable and biological risk factors and breast cancer, while revealing that SHBG and insulin have paradoxical opposite effects on different molecular subtypes, suggesting distinct etiologic pathways for ER+/ER- and HER2+/HER2- breast cancers that may require subtype-specific prevention strategies.
2021
Cancers
A meta-analysis of 42 case-control studies published 2009-2020 including 110,580 women (30,778 breast cancer cases, 79,802 controls) from PubMed, Embase, and Cochrane Library databases examined the association between oral contraceptive (OC) use and breast cancer risk. OC use was associated with a significantly increased breast cancer risk (OR=1.15; 95% CI: 1.01-1.31; p=0.0358), with additional significant risk factors including early menarche, nulliparity, non-breastfeeding, older age at first birth, postmenopause, obesity, smoking, and family history of breast cancer. Despite this meta-analysis and extensive previous studies supporting the conclusion that oral contraceptive pills modestly increase breast cancer risk by approximately 15%, the relatively small effect size, heterogeneity across studies, and authors’ call for further confirmation indicate that the relationship between contemporary OC formulations and breast cancer requires continued investigation, particularly regarding dose-response relationships, specific formulation types, and timing of exposure relative to reproductive events.
2021
Nutr Cancer
A case-control study of 317 breast cancer patients and 526 controls in Córdoba, Argentina found that women consuming the most pro-inflammatory diets (highest Dietary Inflammatory Index scores) had a 34% increased breast cancer risk compared to those with the least inflammatory diets. The association was markedly stronger among overweight and obese women, who showed a 98% increased risk with pro-inflammatory diets, and the effect was amplified in more urbanized areas compared to rural settings. These findings suggest that dietary patterns promoting systemic inflammation contribute to breast cancer risk, particularly in combination with obesity and urban lifestyle factors, highlighting the potential for dietary interventions focused on anti-inflammatory foods as a prevention strategy, especially in overweight women living in urban environments.
2020
Breast Cancer Res Treat
A pilot study of 37 breast cancer patients found that women with HER2-positive breast cancer (an aggressive subtype) had 12-23% lower gut bacterial diversity and different bacterial compositions compared to HER2-negative patients, with less Firmicutes and more Bacteroidetes bacteria. The research also revealed that women who started menstruating early (age 11 or younger) and those with higher body fat had lower gut bacterial diversity, suggesting links between gut microbiome composition and known breast cancer risk factors. While the study was small, these findings indicate that gut bacteria composition may be connected to both breast cancer characteristics and established risk factors, warranting larger studies to better understand these relationships and their potential implications for prevention and treatment.
2020
Cells
A comprehensive review reveals that imbalanced gut and body microbiomes are linked to nearly all established breast cancer risk factors—including obesity, aging, periodontal disease, alcohol intake, reproductive history, and elevated estrogen levels—suggesting that microbial dysbiosis may itself be an important independent risk factor. The altered bacteria can promote cancer through multiple mechanisms: producing harmful metabolic byproducts, changing how the body processes medications and environmental chemicals, disrupting immune system function, and affecting how well cancer treatments work. These findings suggest that maintaining a healthy microbiome through diet, lifestyle, or therapeutic interventions could potentially reduce breast cancer risk and improve treatment outcomes, representing a promising new frontier in breast cancer prevention and management.
2019
Arch Med Res
A case-control study of 101 incident breast cancer cases and 101 matched controls at the Instituto de Seguridad Social del Estado de México y Municipios found that women who worked night shifts had 8.58-fold higher odds of breast cancer compared to those who never worked nights (OR=8.58; 95% CI: 2.19-33.8), while breastfeeding was protective (OR=0.12; 95% CI: 0.02-0.60) and early menarche ≤12 years increased risk (OR=18.58; 95% CI: 2.19-148). Despite the small sample size yielding wide confidence intervals, these findings from Mexican women are consistent with studies from other countries positively associating night shift work with breast cancer risk. The results support the hypothesis that night shift work involving circadian disruption increases breast cancer risk, though the large effect size and wide confidence intervals suggest the need for larger studies with more precise estimates to confirm these associations in Mexican populations.
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.
2017
Molec Cell Endocrinol
This study examines the role of environmental estrogen-like endocrine-disrupting chemicals (EEDs) in breast cancer development. EEDs are synthetic compounds that mimic estrogen, and the ones being studied in this paper include polychlorinated biphenyls (PCBs), bisphenol A (BPA), and phthalates. The results of the study show that of the EEDs tested, only one type of PCB, PCB138, had a strong association with the formation of breast cancer, where as phthalates (and it metabolites) but and BPA showed no strong correlation. Additionaly, the researchers identify that these EEDs promote the proliferation of breast cancer cells, induce epigenetic changes that may increase susceptibility to cancer, as well as alter developmental pathways during critical windows of breast development.