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According to a British study of 102,869 women over the age of 10, night shift work does not increase the risk of bad cancer.
The Breast Cancer Now Generations study is the latest to examine the supposed link presented by experts for decades.
In 2007, the International Agency for Research on Cancer (IARC) concluded that shift work disrupting the sleep-wake cycle of the body was "probably carcinogenic". However, the agency needs to review its findings this summer.
Breast cancer now claims that the latest research, which he funded, is the most comprehensive to date. Michael Jones, co-author of the study and researcher in genetics and epidemiology at the London Cancer Institute, said: "A possible link between electrical light exposure at night and an increased risk of bad cancer was first proposed more than 30 years ago, but research has not shown up. now not conclusive.
"In our new study, we found no overall relationship between women who performed night work in the last 10 years and their risk of bad cancer, regardless of the types of work they do with night shifts. their age. job."
Breast cancer is the most common cancer in the UK, with around 55,000 women and 350 men diagnosed each year. The findings of previous research have been different about the impact of shift work.
In 2009, following research conducted by IARC in 2007, Denmark began to compensate dozens of women with the disease who claimed that their illness was caused by night shifts.
But the study published Wednesday in the British Journal of Cancer relies on the findings of a 2016 meta-badysis suggesting that there was little or no badociation.
This study was called into question because of the higher average age of participants and the lack of details about the nature of women's shift work.
In the last study, the median age of participants at recruitment age in the last study was 17.5% and 17.5% of participants reported being night workers working nightly so regular between 10pm and 7am in the last 10 years. The data on the teams were followed six years later.
The researchers found that 2,059 women out of 102,869 developed invasive bad cancer. Taking into account confounding risk factors, the researchers found no overall badociation with night work.
Nor did they find a significant difference in risk with regard to the type of night work, the age at which the work was started, or whether it started before or after a first pregnancy.
The only statistically significant trend was observed specifically with the average number of night hours per week, but the researchers stated that this was not supported by previous evidence nor by any proposed biological explanation.
Delyth Morgan, general manager of Breast Cancer Care and Breast Cancer Now, who funded the study, said, "We hope these findings will help rebadure the hundreds of thousands of women working at night, that it is unlikely that their employment patterns increase the risk of bad cancer. Cancer."
Jones pointed out that night shifts could still have other adverse health effects.
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