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Ralph Ermoian, MD

Associate Professor


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 Fred Hutchinson Cancer Center – Proton Therapy.

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

Selected Publications from a Total of 19

Rao AD, Chen Q, Ermoian RP, Alcorn SR, Figueiredo MLS, Chen MJ, Dieckmann K, MacDonald SM, Ladra MM, Kobyzeva D, Nechesnyuk AV, Nilsson K, Ford EC, Winey BA, Villar RC, Terezakis SA. Practice patterns of palliative radiation therapy in pediatric oncology patients in an international pediatric research consortium. Pediatr Blood Cancer. 2017 Jul 11. PMID: 28696044

Kim A, Ford E, Spraker M, Zeng J, Ermoian R, Jordan L, Kane G, Nyflot M. Are we making an impact with incident learning systems? Analysis of quality improvement interventions using total body irradiation as a model system. Pract Radiat Oncol. 2017 Jun 6. PMID: 28688909

Ermoian RP, Breneman J, Walterhouse DO, Chi YY, Meza J, Anderson J, Hawkins DS, Hayes-Jordan AA, Parham DM, Yock TI, Donaldson SS, Wolden SL. 45 Gy is not sufficient radiotherapy dose for Group III orbital embryonal rhabdomyosarcoma after less than complete response to 12 weeks of ARST0331 chemotherapy: A report from the Soft Tissue Sarcoma Committee of the Children’s Oncology Group. Pediatr Blood Cancer. 2017 Sep;64(9).  2017 May 26. PMID: 28548706

Chapman TR, Ermoian RP. Proton therapy for pediatric cancer: are we ready for prime time? Future Oncol. 2017 Jan;13(1):5-8. Epub 2016 Sep 22. PMID: 27905257

Odei B, Frandsen JE, Boothe D, Ermoian RP, Poppe MM. Patterns of Care in Proton Radiation Therapy for Pediatric Central Nervous System Malignancies. Int J Radiat Oncol Biol Phys. 2017 Jan 1;97(1):60-63. Epub 2016 Sep 17. PMID: 27816365

Sponseller P, Pelly N, Trister A, Ford E, Ermoian R. Radiation treatment for the right naris in a pediatric anesthesia patient using an adaptive oral airway technique. Med Dosim. 2015 Autumn;40(3):201-4. Epub 2015 Jan 22. PMID: 25619555

Gensheimer MF, Hawkins DS, Ermoian RP, Trister AD. Assessing the scale of tumor heterogeneity by complete hierarchical segmentation of MRI. Phys Med Biol. 2015 Feb 7;60(3):977-93. Epub 2015 Jan 9. PMID: 25575341

Ermoian R, Ladra M, Patel S. Children’s Oncology Group L991 final study report: Establishing an important benchmark for assessing late effects of trimodality care of pediatric patients treated for high grade gliomas. Transl Pediatr. 2012 Jul;1(1):3-5. PMID: 26835257

Research Interests

  • Children’s Oncology
  • Soft Tissue Sarcoma
  • Pediatric Brain Tumor
  • Patient Safety in Radiation Therapy