Excess weight may increase the risk of developing breast cancer among postmenopausal women with cardiovascular disease, according to a study by the World Health Organization (WHO), published on Monday.

Higher body mass index (BMI) is a known risk factor for breast cancer in postmenopausal women. The study, published in the peer-reviewed journal of the American Cancer Society CANCER, unravels how the risk differs among women with and without cardiovascular disease or type 2 diabetes.

It showed that each 5 kg/m2 increase in BMI was associated with a 31 per cent higher risk of breast cancer in women who developed cardiovascular disease during follow-up and a 13 per cent higher risk in women without cardiovascular disease.