Headshot photo of Guillaume Pegna, M.D.

Accepting new patients

Guillaume Pegna, M.D.

Accepting new patients

  • Assistant Professor of Medicine, Division of Hematology/Medical Oncology, School of Medicine


  • Cancer
  • Hematology Oncology

Special focus

  • Gastrointestinal Cancer
  • Medical Oncology and Hematology

Locations and contact

I see patients at

About me

Dr. Pegna specializes in the care of adults with cancers of the gastrointestinal (GI) and neuroendocrine systems (NETs). He is additionally interested and experienced in the management of rare tumors including pheochromocytomas, paragangliomas and adrenocortical carcinomas. Dr. Pegna is actively involved with clinical trials and cancer research to improve survival and quality of life for cancer patients and to better understand the biology of these diseases. He specializes in the use of chemotherapy, immunotherapy and multidisciplinary approaches to cancer care. Dr. Pegna finds it rewarding to help patients understand their disease, providing treatment options based on each individual patient, and supporting them through their treatment journeys. Dr. Pegna grew up in Upstate New York in a French-speaking family and goes by either Guillaume or Will, the English translation of his name. Although he has spent most of his life on the east coast, Dr. Pegna, along with his wife and children, were very excited to move to Portland.

Outside of work, he enjoys hiking, ice hockey and traveling with his family. He very much looks forward to exploring the sights and tastes of his new home here in Oregon.

Education and training

  • Degrees

    • B.S., 2009, Stony Brook University
    • M.S., 2010, Stony Brook University
    • M.D., 2015, University of North Carolina School of Medicine
  • Residency

    • Internal Medicine, University of North Carolina, 2018
  • Fellowship

    • Hematology and Oncology, National Institutes of Health, 2021
  • Certifications

    • American Board of Internal Medicine, 2018
    • ABIM Medical Oncology Board Certified, 2021

Memberships and associations:

  • American Society of Clinical Oncology
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Ratings and reviews

Overall: 4.8 out of 5 (117 Ratings, 37 Reviews)

The patient ratings score is an average of all responses to the question "How likely would you be to recommend this provider to your family and friends (on a scale of 0 to 10)" on our nationally-recognized NRC patient surveys.

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