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Nicolas Prionas


Radiation oncologist
Bay Area native with a passion for serving our communities

Dr. Nicolas Prionas is a radiation oncologist who cares for adults with all types of cancer. He has a special interest in treating breast cancer.

In research, Prionas focuses on developing new technologies to improve the early detection, diagnosis and treatment of cancer. He is also interested in exploring applications of technology to increase access to equitable cancer care.

Prionas earned a bachelor's degree in biomedical computation and a master's degree in biomechanical engineering at Stanford University. At the University of California, Davis, he earned both a doctorate in biomedical engineering and his medical degree. He completed a residency in radiation oncology at Stanford Medicine.

Prionas is a member of the American Medical Association, American Society for Radiation Oncology, Radiological Society of North America, American Brachytherapy Society and American Association of Physicists in Medicine. He speaks Greek and Spanish.

  • Education

    UC Davis, MD, 2014

  • Residencies

    Stanford Medicine, Radiation Oncology, 2019

  • Academic Title

    Assistant Professor

Where I see patients (5)

    My reviews


    Overall Experience
    56 Ratings
    About our process
    Jan 23, 2023
    Dr Prionas is exceptional -I particularly appreciated his explanations and answers to my questions. He is an exceptional teacher and the most compassionate Dr I have met so far in my cancer treatment journey
    Nov 29, 2022
    Dr prionas is amazing compassionate excellent listener
    Sep 15, 2022
    Very special doctor
    Jul 17, 2022
    Dr. Prionas is great at involving me in discussions about my care and test results and takes all the time necessary to fully explain results and answer my questions.
    Apr 30, 2022
    Dr Prionas is a rare physician. He is so informed friendly and reassuring. Explains options well very open to questions and is very empathetic. Gives time for my concerns. He is exceptional. I wish all doctors were like him. He is definitely an asset to UCSF.
    Dec 08, 2021
    Dr Prionas is A GEM- brilliant warm patient and simply put a fantastic clinician and exceptional human being. I've worked in health care over 20 yrs - there is not a better MD that exists. I hope he receives all the accolades and awards he do deserves !
    Aug 06, 2021
    Dr. Prionas is one of the best doctors I have had supporting me and my health. He listens and starts with what I understand versus tell me what I should understand. He took the time to understand my background and modifies his communication and information so I can engage with him in my health care decisions. I have a lot of trust in him and appreciate his advocacy and support on my behalf during some really difficult health challenges.
    Aug 02, 2021
    I couldn't be more grateful to have had this appointment in order to discuss my concern that ha I guess radiation was the best path for me.
    Jul 28, 2021
    Dr. Prionas was very attentive and comprehensive with explanations supported by medical studies
    Jul 27, 2021
    Really felt like Dr. Prionas listened and was compassionate and cared about my unique circumstances.
    Apr 18, 2021
    Dr Prionas is a kind compassionate physician that is acutely aware of the human experience behind the dx of cancer. His thoughtful approach was outstanding