Journal
CANCER CAUSES & CONTROL
Volume 21, Issue 12, Pages 2281-2285Publisher
SPRINGER
DOI: 10.1007/s10552-010-9653-z
Keywords
Light at night; Breast cancer; Case-control study
Funding
- National Cancer Institute/National Institute of Environmental Health Science [CA-62986]
- [5D43TW008323]
- [5D43TW007864]
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Objective To investigate the potential association between domestic exposure to light at night (LAN) and the risk of human breast cancer. Methods A case-control study of female breast cancer was conducted in Connecticut. A total of 363 incident breast cancer cases and 356 age frequency-matched controls were interviewed using a standardized, structured questionnaire to obtain information on sleeping patterns and bedroom light environment. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated by unconditional multivariate logistic regression. Results A non-significantly increased risk of breast cancer was observed among postmenopausal women for those keeping lights on while sleeping (OR = 1.4, 95% CI 0.7, 2.7), those who reported mainly sleeping in the daytime (OR = 1.4, 95% CI 0.5, 4.3), and those not drawing the curtains/window shades while sleeping at night (OR = 1.2, 95% CI 0.8, 1.9). Conclusion The results from this study suggest a potential increased risk of breast cancer associated with domestic exposure to LAN. Further studies with larger sample size are needed to confirm the results.
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