Photo: Vladimir Astapkovich / RIA Novosti
Scientists of the University of Montreal (Canada) found that women who work at night, increases the risk of breast cancer. About it reported in a press release on MedicalXpress.
The study involved more than 13 thousand women from Australia, Canada, France, Germany and Spain. The average age of the subjects was up to 55-59 years. From them 6,1 thousand volunteers was diagnosed with breast cancer. Among all of the subjects were also surveyed to determine risk factors for the development of malignant tumors.
It turned out that the likelihood of developing estrogen-receptor positive (ER-positive) cancer and HER2-positive breast cancer increased with number of night hours spent on the job. So, the women that work three hours after midnight, the risk increases 12 percent. 10-hour night shift for more than three nights per week, this figure increases to 80 percent.
The indicator returns to normal only after two years after retiring from the night shift. The researchers explain this relationship with a disturbance of circadian rhythms and impeding the secretion of the hormone melatonin, which has an antitumor effect.
Video, photo All from Russia.