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Ralph Ermoian, MD

Locations of Practice

SCCA Proton Therapy Center

1570 N 115th Street
Seattle, WA 98133 206.306.2800

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Seattle Children’s

4800 Sand Point Way NE
Seattle, WA 98105 206.987.2000

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Dr. Ermoian is a radiation oncologist who treats pediatric patients with brain tumors, blood tumors requiring stem cell transplants, and salivary gland tumors. He is the UW Department of Radiation Oncology program and disease site lead for pediatric and childhood tumors. Dr. Ermoian practices at UW Medical Center, Seattle Children’s, and SCCA Proton Therapy Center.

Patient Care Philosophy

“I want to provide the same care that I would want and expect of my own health-care providers if I had cancer: compassionate, detail-oriented, and patient-centered care that is tailored to the patient’s medical needs and goals.”

Education and Training

College: M.S. and B.S., Stanford University, Palo Alto, CA, 1993

Medical Education: UCSF School of Medicine, San Francisco, CA, 2003

Internship: Children’s Hospital, Boston Pediatrics, Boston, MA, 2004


  • Pediatrics, University of California – San Francisco, San Francisco, CA, 2007
  • Radiation Oncology, University of Washington, Seattle, WA, 2011

Treatment Specialties

Open Clinical Trials