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Abstract
Essence
Night shift work may raise breast cancer risk through light-at-night circadian disruption, but prevention evidence is absent.
Evidence
A review-style synthesis cites human epidemiologic evidence and animal mechanistic studies supporting night shift work as a probable carcinogenic exposure.
Caveat
Individual risk varies by circadian light sensitivity, baseline breast cancer risk, schedules, and light exposure, and the abstract reports no evidence for risk-reducing interventions.
Simplified
Circadian Biology