Kathryn J. Ruddy, M.D., M.P.H., is a medical oncologist specializing in breast cancer. She has particular expertise in treating younger women with breast cancer, helping them navigate the side effects of cancer treatment and address survivorship issues such as fertility preservation and future pregnancy. Dr. Ruddy also has expertise in male breast cancer and survivorship concerns unique to men. She is active in research focused on prediction and prevention of toxicity in patients with cancer. Dr. Ruddy is the Director of Cancer Survivorship for the Department of Oncology at Mayo Clinic.