The overall association for long-term shift work showed no interaction by tumor hormone receptor status, while shorter durations working nights didn't significantly correlate with breast cancer risk.
Source/Credit: MedPage Today |
By Crystal Phend | July 3, 2013
Working the night shift long term raises breast cancer risk, likely across job types, researchers affirmed.
Breast cancer risk was 2.21-fold higher with 30-plus years of night-shift work versus none in a general population sample (95% CI 1.14-4.31), Kristan Aronson, PhD, of Queen's University Cancer Research Institute in Kingston, Ontario, and colleagues found.
The odds ratios for breast cancer were particularly strong with 30-plus years of night work in the health occupations, at 3.11 versus no night work, the group reported online in Occupational and Environmental Medicine.
The odds also reached 2.25-fold with 30 or more years working nights in nonhealth jobs but without statistical significance (95% CI 0.92 to 5.52).
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