Study: Night shifts raise women's risk of cancer

Women who work night shifts could have an increased risk of developing multiple common cancers, especially breast cancer, researchers from China said Monday.

Ma Xuelei, an oncologist at Sichuan University, and his colleagues performed meta-analysis using data from 61 articles comprising 114,628 cancer cases and 3.9 million participants from North America, Europe, Australia and Asia.

It turned out that long-term night shift work among women increased the risk of cancer by 19 percent.