Belfast Telegraph

Thursday 24 April 2014

Night shift link to breast cancer

Women who work more than two night shifts a week face a 40% greater risk of developing breast cancer, researchers have warned.

Experts believe the hormone melatonine that potentially suppresses tumours may be disrupted by constant exposure to light during night-time hours.

The latest study, backed by the Danish Cancer Society, involved women in the Danish army who, on top of a number of factors, described themselves as either a morning person or an evening person.

On top of a 40% increased risk of breast cancer for those on night shift, the survey also found that those who had worked night shifts at least three times a week for at least six years were more than twice as likely to have contracted the disease as those who had not.

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