HealthDay News – By Robert Preidt
Friday, October 21, 2011
Elevated levels of hormones increase breast cancer risk in postmenopausal women, and as the number of different elevated hormones rises, so does the risk, a new study has found.
Researchers from Brigham and Women’s Hospital and Harvard Medical School in Boston examined levels of eight different sex and growth hormones in blood samples collected from nurses up to nine years before their health information was recorded.