Long recommended as a defense against heart disease, aspirin may soon help lesbians in the fight against another leading killer, breast cancer. In a study published in the Journal of the American Medical Association on May 26, researchers at Columbia University showed that women who used aspirin at least four times a week were almost 30% less likely to develop hormone-fueled breast cancer.They theorize that the drug interferes with the body’s production of estrogen, which promotes cancer growth.