Enter your email address and we'll send you a link to reset your password. See the Evidence section for more information. It helps determine which risk-reduction options—medical chemoprevention gail model for breast cancer risk tamoxifensurgical prophylactic mastectomy or lifestyle changes only—are most appropriate for individual patients by weighing risks and benefits of intervention versus likelihood of developing cancer. Please fill out required fields. He is a former president of the American Statistical Association. His research focuses on creating models for determining absolute risk of diseases.