Women in professional jobs had a near 70 per cent higher risk of breast cancer than other women, the study found.
The research, based on a 55-year study of women who were in their thirties in the 1970's, links job stress and cancer, and shows that the longer a woman held the job, the greater the risk.
The study focused on nearly 4,000 women who were all aged 36 in 1975, The Independent reported.
The researchers said that while women going into management in the 1970s were breaking new ground, the same kind of stress affects women today.
"Neither men or women preferred to work for a woman because women were seen as 'temperamentally unfit' for management, which was consistent with the cultural stereotype of the woman boss.
"Exercising job authority was particularly stressful for women in the context of gender inequality embedded in the occupational structure of the time, when women in managerial positions often faced prejudice, tokenism, discrimination, social isolation, and resistance from subordinates, colleagues, and superiors.
