Covid-19 Update | Announcement - Dr Pittier Now at St Joseph Medical Pavilion Location


Tacoma/Valley Radiation Oncology Centers use a team approach for patient care. Within our centers, our board-certified radiation oncologists lead a highly trained health care team. We have full-time board-certified medical physicists and dosimetrists who work closely with our physicians to ensure optimal treatment planning and delivery. Our therapists are certified by the American Registry of Radiological Technologists in Radiation Therapy. Our physicians work closely with your other doctors to provide a coordinated delivery for your care.

Dr. Dean Mastras

Dr. Mastras earned his bachelor’s degree from Lehigh University and his medical degree from University of Vermont. He completed his postgraduate training at University of Hawaii and University of Washington Medical Center and was certified by the American Board of Radiology. Dr. Mastras joined Tacoma/Valley Radiation Oncology Centers in 1993. Dr. Mastras is board certified. […]

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Dr. Herbert Wang

Dr. Wang earned his medical degree from the University of California at Davis, School of Medicine. He completed a one-year internship at the University of California, San Francisco/California Pacific Medical Center prior to his residency and fellowship in Radiation Oncology at the University of Chicago Medical Center. He remained as an instructor for one year […]

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Dr. Nathan Bittner

Dr. Bittner has a long list of academic and professional achievements to his credit, and he’s a valued member of our clinic staff. After receiving both bachelor’s and master’s degrees in the Department of Bioengineering from the University of Washington, Dr. Bittner went on to earn a medical doctorate from the University’s  School of Medicine.  […]

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Dr. Ann Pittier

Dr. Pittier earned her bachelor’s degree at Occidental College before pursuing her medical degree at Trinity College and completing an Internal Medicine residency at the University of Washington. She furthered her training with an emphasis on cancer treatment, and completed a second residency in Radiation Oncology at the University of Washington Medical Center. Dr. Pittier […]

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Dr Wendy Gao

Dr. Wendy Gao

Dr. Gao joined the medical staff in 2015. A graduate of Queen’s University in Kingston, Ontario, she obtained her medical degree at Albert Einstein School of Medicine in Bronx, New York. She completed her internship at Montefiore Medical Center in the Bronx and her residency in radiation oncology at the University of Washington Medical Center. […]

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Dr. Brent Tinnel

Dr. Brent Tinnel is a board certified Radiation Oncologist who is excited to join Tacoma/Valley Radiation Oncology Centers at Capital Medical Center and serve his home community. He earned his Bachelor Degree from Seattle University. Upon graduating with honors, he was commissioned as an officer in the United States Army. He earned his Medical Degree […]

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Dr. Robyn Vera

Dr. Robyn Vera is a native of the Pacific Northwest. She completed a Bachelor of the Arts and a Bachelor of Science from the University of Washington in 1999. She attended the Chicago College of Osteopathic Medicine in Downers Grove Illinois and graduated in 2006. She worked as a research intern at M.D. Anderson Cancer […]

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Dr. Diane Tsai

Dr. Diane Tsai completed her undergraduate degree at Johns Hopkins University, Baltimore, MD. She returned to her home state of New Jersey to earn her medical degree at University of Medicine and Dentistry of New Jersey, UMDNJ. She completed an internship year in Primary Care Internal Medicine at Yale, before her specialty training in Radiation […]

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