Calcium and vitamin D may help prevent the pre-menopause development of breast cancer according to scientists in the US. Writing in the Archives of Internal Medicine, a team from Brigham and Women’s Hospital and Harvard Medical School, in Boston, says in a sample of more than 10,000 pre-menopausal and more than 20,000 postmenopausal women aged 45 and over, monitored for an average of 10 years, it found that higher intakes of total calcium and vitamin D are ??moderately linked? with a lower risk of breast cancer menopause, but not after.