Bernard Fisher

Bernard Fisher conducted the landmark NSABP P-1 trial demonstrating that tamoxifen reduces breast cancer incidence by 49 percent in high-risk women, establishing the first proven pharmacological cancer prevention strategy and creating the chemoprevention field. His paradigm-shifting demonstration that breast cancer is a systemic disease from inception revolutionized both treatment and prevention approaches. His work on breast-conserving surgery replaced radical mastectomy as the standard of care worldwide.