BMC Women’s Health – This systematic review and meta-analysis aimed to update the current evidence regarding the relationship between night-shift work duration and breast cancer risk. Based on the overall evaluation of 26 eligible articles, in the short-term night-shift workers, the risk of breast cancer was increased (RR = 1.13, 95% CI: 1.03–1.24), but the increase did not observe in the long-term night-shift workers (RR = 1.08, 95% CI 0.99–1.17). The researchers suggest further studies with adequate information and exact definition regarding night shift work and its duration.
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