Radiation Oncology Residency Program

The Radiation Oncology Residency Program is a four-year radiation oncology residency accredited by ACGME. The program's mission is to nurture exceptional radiation oncologists, equipping them with the knowledge and skills needed to establish successful and rewarding careers as clinicians, educators, researchers, and advocates. We are committed to delivering this training within a diverse, inclusive, and collegial educational environment where the well-being and professional development of trainees are of the utmost importance. This commitment aligns with the University's mission of healing, teaching, and discovery.

Training encompasses a blend of supervised clinical experiences, seminars, lectures, and research assignments, all designed to enhance the trainee's clinical proficiency and provide a solid scientific foundation for growth. Throughout the four-year training, trainees gradually assume increasing levels of responsibility as they rotate through various segments of the program.

Learn more about our residency program, including details about the curriculum, application requirements, and additional information.

The Radiation Oncology Residency Program aims to offer residents a robust, progressive clinical experience in radiation oncology, complemented by essential basic science and research support. The program will achieve this by providing a blend of supervised clinical experiences, seminars, lectures, and research assignments, all carefully designed to enhance the resident's clinical skills and establish a strong scientific foundation for their growth. The objectives of the Radiation Oncology Residency Program include:

  • Train physicians to think critically and independently for the practice of patient-centered radiation oncology with graduated responsibility as residents demonstrate competence.
  • Promote a culture of safety and continuous system-based improvement.
  • Provide an advanced educational experience in all radiation oncology subspecialties.
  • Provide opportunities for research and/or professional development during residency.
  • Develop well-adjusted residents through the promotion of resident well-being and happiness.
  • Promote diversity and inclusiveness in the workforce.

Program leadership

Nima Nabavizadeh, M.D.

Dr. Nabavizadeh, associate professor of Radiation Medicine, currently holds the position of program director for the medical residency program. He earned his medical degree from the University of Oklahoma College of Medicine and completed his residency at OHSU. Dr. Nabavizadeh's accomplishments include induction into the Alpha Omega Alpha honors society for medical academic excellence. He also possesses a degree in Mechanical Engineering from the University of Oklahoma.

Program faculty

Aaron Grossberg, M.D., Ph.D.

Dr. Grossberg, an assistant professor of radiation medicine, also serves as the co-director of the program's radiation biology curriculum. He earned his medical and doctorate degrees from OHSU and completed his residency training at the University of Texas - MD Anderson Cancer Center. Dr. Grossberg focuses his practice on cancers of the pancreas and breast.

Arthur Hung, M.D.

Dr. Hung, an associate professor and interim chair of the Department of Radiation Medicine, received his medical degree from The Ohio State University and completed his residency at the University of Texas – MD Anderson Cancer Center. His practice centers on cancers of the genitourinary tract, gastrointestinal tract, hepatobiliary system, soft tissue sarcomas, and melanomas. He also serves as the medical director of the Radiation Therapy Training Program.

Casey Williamson, M.D., M.A.S.

Dr. Williamson, an assistant professor of Radiation Medicine and faculty advisor for the Radiation Medicine Student Interest Group, received his medical degree and a master's degree in clinical research from University of California San Diego and completed his residency training at the UC San Diego Radiation Oncology Residency Program. His clinical interests center on the treatment of gynecologic and genitourinary cancers with expertise in both external beam radiation therapy and brachytherapy.

Joshua Walker, M.D., Ph.D.

Dr. Walker, an assistant professor of radiation medicine, co-directs the program's radiation biology curriculum. He earned both his medical and doctorate degrees at OHSU and completed his residency there as well. Dr. Walker's clinical interests primarily revolve around tumor immunotherapy and radiotherapy of solid tumors.

Lubna Hammoudeh, M.D.

Dr. Lubna Hammoudeh, an assistant professor of Radiation Medicine, earned her medical degree from Mu’tah University School of Medicine and completed her residency training at the King Hussein Cancer Centre in Amman, Jordan. Additionally, she completed a fellowship in Central Nervous System/Supportive and Palliative Radiation Oncology at Dana-Farber/Brigham and Women’s Cancer Center. Her clinical focus includes the treatment of central nervous system (CNS) tumors, which encompasses stereotactic radiosurgery, Gamma Knife procedures, MRI-guided focused ultrasound (MRgFUS), and CNS brachytherapy.

Reid F. Thompson, M.D., Ph.D.

Dr. Thompson, an assistant professor of radiation medicine, is also a member of the Knight Cancer Institute's Computational Biology Program. He obtained his medical and doctorate degrees from the Albert Einstein College of Medicine and completed his residency at the University of Pennsylvania. Dr. Thompson also holds degrees in genetics and biophysical chemistry. His clinical focus includes the treatment ofmelanoma and other skin cancers using radiotherapy, often in combination with other agents such as immunotherapy.

Sophia Bornstein, M.D., Ph.D. 

Dr. Bornstein, a clinical associate of radiation medicine, earned her medical and doctorate degrees from Oregon Health and Science University School of Medicine and completed her residency at the Radiation Oncology Residency Program.  Her clinical focus includes the treatment of breast cancers.

Timur Mitin, M.D., Ph.D.

Dr. Mitin, an associate professor of radiation medicine, received his medical and doctorate degrees from Tufts University and completed his residency training at the Harvard Radiation Oncology Program. His clinical interests center on the treatment of genitourinary malignancies, with a special focus on bladder preservation therapy for patients with muscle-invasive bladder cancer.

Program Director

Nima Nabavizadeh, MD

Nima Nabavizadeh, M.D., currently serves as the Radiation Oncology Residency Program Director and also fulfills the role of Director for The Knight Cancer Institute's Cancer Early Detection Advanced Research Center (CEDAR). He earned degrees in mechanical engineering and medicine from the University of Oklahoma College and completed his residency at OHSU. Dr. Nabavizadeh earned induction into the Alpha Omega Alpha honors society for outstanding academic excellence in medicine. In 2016, after completing his residency, he joined the Department of Radiation Medicine as faculty.

Dr. Nabavizadeh specializes in lymphoma and gastrointestinal (GI) cancers.

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