Jeffrey Y. Ahn, MD

At the UCI Health Chao Family Comprehensive Cancer Center — Yorba Linda, we help you fight cancer on all fronts. As the only National Cancer Institute-designated comprehensive cancer center in Orange County, we treat more patients with cancer — and more complex cases — than any other healthcare provider in our region. At Yorba Linda, services include benign hematology, clinical trials, comprehensive breast center, hematology oncology, infusion, medical oncology and surgical oncology. Our multidisciplinary team of world-class oncologists, surgeons, radiation oncologists, pathologists, nurses, rehabilitation therapists, pharmacists, social workers and dietitians works together seamlessly to treat cancers of all types and degrees of severity. Our cancer experts are also available to provide second opinions.

Dr. Michael Y. Oh is a board-certified UCI Health neurosurgeon who specializes in spine disorders as well as stereotactic and functional neurosurgery for movement disorders such as Parkinsons disease and other neurodegenerative disorders.His clinical interests include endoscopic spine surgery, spinal cord stimulation, deep brain stimulation, spine tumors and spine deformities.He sees patients in Irvine, Laguna Hills, Orange and Yorba Linda.

Dr. Holly M. Yong is a board-certified UCI Health surgical oncologist who specializes in the treatment of breast cancers and benign breast diseases. Her clinical interests include caring for young and high-risk breast cancer patients, oncoplastic surgery, health disparities, and innovative technology in breast cancer. Her passion for technological advancements led her to an observership at the Seoul National University Hospital (SNUH) in South Korea, where she learned techniques for robotic mastectomy and oncoplastic techniques. Yong earned her medical degree from the Medical College of Wisconsin in Milwaukee. She completed a residency in general surgery at Kaiser Permanente Los Angeles Medical Center, followed by fellowship training in breast surgical oncology at the City of Hope Cancer Center in Duarte, Calif. Her research interests include oncofertility in premenopausal breast cancer patients, epigenetics and breast cancer and health disparities within the Asian communities. Her philosophy of care is providing the utmost care and compassion during patients’ most vulnerable moments, while respecting their cultural backgrounds. Yong, who also speaks Korean.