The analysis is based on 61 international studies of nearly 4 million women living in Europe, the United States, Australia and Asia who worked long-term at night. They have a total of 19% greater risk of being affected by cancer than those with traditional work schedules.
Nurses would be particularly affected
For every five years worked at night, the risk of breast cancer would increase by 3.3%. Of all the professions studied, nurses are the most affected: a 58% increased risk for breast cancer, 35% for the digestive system (stomach, esophagus, liver, pancreas, rectum colon) and 28% for the lung .
According to the authors of the study, these figures can be explained by the harshness of night work, but also because these women are more often subjected to screening tests. And to conclude that night work should be considered a risk factor for cancer in women and advises more frequent examinations.