Abstract | INTRODUCTION: Potentially carcinogenic hazardous air pollutants (air toxics) have been inconsistently associated with breast cancer. Whether metabolic factors modify these associations is unknown. We studied 29 non-metallic air toxics classified as mammary gland carcinogens in animal studies in relation to breast cancer risk. METHODS: Participants included 49,718 women from the Sister Study. Census tract air toxic concentration estimates from the 2005 National Air Toxics Assessment were linked to enrollment residential addresses. Adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for individual air toxics were estimated using Cox regression. Body mass index (BMI) was considered a potential modifier. Relevant mixtures were identified using classification trees. RESULTS: Over follow-up (average = 8.4 years), 2975 women were newly diagnosed with breast cancer (invasive or ductal carcinoma in situ). Several air toxics, including methylene chloride, polycyclic organic matter, propylene dichloride, and styrene, were associated with increased risk. Of these, methylene chloride was most consistently associated with risk across multiple analyses. It was associated with overall (HRquintile 4vs1 = 1.21 (95%CI = 1.07-1.38)) and estrogen receptor positive (ER+) invasive breast cancer (HRquintile 4vs1 = 1.28 (95%CI = 1.08-1.52)) in individual pollutant models, although no dose-response was observed. Associations were stronger among overweight/obese (vs. non- overweight/obese) women (p < 0.05) for six air toxics. The classification tree identified combinations of age, methylene chloride, BMI, and four other toxics ( propylene dichloride, ethylene dibromide, ethylidene dichloride, styrene) related to overall breast cancer. CONCLUSIONS:
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Authors | Nicole M Niehoff, Marilie D Gammon, Alexander P Keil, Hazel B Nichols, Lawrence S Engel, Dale P Sandler, Alexandra J White |
Journal | Environment international
(Environ Int)
Vol. 130
Pg. 104897
(09 2019)
ISSN: 1873-6750 [Electronic] Netherlands |
PMID | 31226564
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, N.I.H., Intramural, Research Support, Non-U.S. Gov't)
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Copyright | Published by Elsevier Ltd. |
Chemical References |
- Air Pollutants
- Carcinogens
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Topics |
- Air Pollutants
(analysis)
- Air Pollution
(statistics & numerical data)
- Breast Neoplasms
(epidemiology)
- Carcinogens
(analysis)
- Cohort Studies
- Female
- Humans
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