Case–control study of breast cancer and exposure to synthetic environmental chemicals among Alaska Native women

Details

• Alternative Title:
  Int J Circumpolar Health
• Personal Author:
  Holmes, Adrianne K. ; Koller, Kathryn R. ; Kieszak, Stephanie M. ; Sjodin, Andreas ; Calafat, Antonia M. ; Sacco, Frank D. ; Varner, D. Wayne ; Lanier, Anne P. ; Rubin, Carol H.
• Description:
  Background
  
  Exposure to environmental chemicals may impair endocrine system function. Alaska Native (AN) women may be at higher risk of exposure to these endocrine disrupting chemicals, which may contribute to breast cancer in this population.
  
  Objective
  
  To measure the association between exposure to select environmental chemicals and breast cancer among AN women.
  
  Design
  
  A case–control study of 170 women (75 cases, 95 controls) recruited from the AN Medical Center from 1999 to 2002. Participants provided urine and serum samples. Serum was analyzed for 9 persistent pesticides, 34 polychlorinated biphenyl (PCB) congeners, and 8 polybrominated diethyl ether (PBDE) congeners. Urine was analyzed for 10 phthalate metabolites. We calculated geometric means (GM) and compared cases and controls using logistic regression.
  
  Results
  
  Serum concentrations of most pesticides and 3 indicator PCB congeners (PCB-138/158; PCB-153, PCB-180) were lower in case women than controls. BDE-47 was significantly higher in case women (GM=38.8 ng/g lipid) than controls (GM=25.1 ng/g lipid) (p=0.04). Persistent pesticides, PCBs, and most phthalate metabolites were not associated with case status in univariate logistic regression. The odds of being a case were higher for those with urinary mono-(2-ethylhexyl) phthalate (MEHP) concentrations that were above the median; this relationship was seen in both univariate (OR 2.16, 95% CI 1.16–4.05, p=0.02) and multivariable (OR 2.43, 95% CI 1.13–5.25, p=0.02) logistic regression. Women with oestrogen receptor (ER)–/progesterone receptor (PR)-tumour types tended to have higher concentrations of persistent pesticides than did ER+/PR+ women, although these differences were not statistically significant.
  
  Conclusions
  
  Exposure to the parent compound of the phthalate metabolite MEHP may be associated with breast cancer. However, our study is limited by small sample size and an inability to control for the confounding effects of body mass index. The association between BDE-47 and breast cancer warrants further investigation.
  
  
• Subjects:
  Adult Aged Aged, 80 And Over Alaska Natives Analysis Of Variance Breast Neoplasms/chemically Induced Breast Neoplasms/epidemiology Case-Control Studies Environmental Exposure/adverse Effects Environmental Pollutants/adverse Effects Female Halogenated Diphenyl Ethers/adverse Effects Humans Incidence Logistic Models Middle Aged Odds Ratio Phthalic Acids/adverse Effects Polychlorinated Biphenyls/adverse Effects Population Groups Reference Values Retrospective Studies

  More +
• Source:
  Int J Circumpolar Health. 2014; 73.
• Document Type:
  Journal Article
• Place as Subject:
  Alaska
• Volume:
  73
• Collection(s):
  CDC Public Access
• Main Document Checksum:
  urn:sha256:63f19f1c5d0a8e47954cd349b567cf2bdf59d924393dfa717be022b044a7a3d1
• Download URL:
  https://stacks.cdc.gov/view/cdc/26199/cdc_26199_DS1.pdf
• File Type:
  [PDF - 195.51 KB ]