Kathryn J. Ruddy is a medical oncologist who sees patients with breast cancer. She has particular expertise in: Premenopausal breast cancer Male breast cancer Survivorship issues including fertility preservation Management of side effects of treatment In addition to her clinical activities, Dr. Ruddy co-leads the Mayo Clinic Cancer Center Symptom Control/Survivorship Cross-Disciplinary Group, and she is active in research focused on prediction and prevention of toxicity in patients with cancer, and patient-reported outcomes during and after cancer treatment. She mentors residents and fellows, speaks at national meetings, and publishes in high-impact scientific journals.