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Nicolas Prionas
4.9 out of 5 (48)
Nicolas Prionas

Nicolas Prionas, MD, PhD

Radiation Oncology

Radiation Oncology at Mount Zion
1600 Divisadero St., Basement Level,
San Francisco, CA 94115
+3 more locations
(415) 353-7175
4.9 out of 5 (48)
Virtual visits available
4.9 out of 5 (48)
Virtual visits available
Radiation Oncology at Mount Zion
1600 Divisadero St., Basement Level,
San Francisco, CA 94115
+3 more locations
(415) 353-7175

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.

  • Board Certifications

    American Board of Radiology, Radiation Oncology, 2021

  • Residencies

    Stanford University School of Medicine, Radiation Oncology, 2019

  • Internship

    Santa Clara Valley Medical Center, Transitional, 2015

  • Education

    University of California, Davis, School of Medicine, 2014

  • Languages

    English

Conditions I specialize in

Treatments I provide

Where I see patients (4)

    My reviews

    4.9

    Overall Experience
    48 Ratings
    About our process
    Mar 27, 2025
    He was the first person to acknowledge the up and down emotions of having to hurry up and make a decision and then wait for information before being able to precede - it truly is a see-saw of what is going to happen - thank you for stating this experience
    Mar 01, 2025
    I very much appreciated Dr. Prionas' thoroughness, listening skills, and ability to communicate the information that I was there to get from him without any sense of talking down. Also really appreciated that, since there was a lot to talk about, he'd pause between topic areas and ask if I had questions before moving on.
    Feb 17, 2025
    Excellent attention. Took the time to explain and answer my questions.
    Jul 27, 2024
    The most thoughtful doctor in the entire cancer process. He puts things in easy to understand terms and truly cares.
    Jul 14, 2024
    My appointment with Dr Prionas is probably one of the best interactions I have ever had with any health car professional. He spent time to explain things throughly and completely, answered my questions and provided clear rationale information about my treatment options and next steps. Dr Prionas is clearly a very gifted intelligent doctor, who is also personable, a good communicator and Seems to really care about patients. He had another Dr in the room also who was nice too ( forget the name) a resident and a couple of students that are learning from him. I'm sure under his tutelage they will be great health care practitioners too.
    Jul 13, 2024
    Professional and knowledgeable. Well explained to all my concerns concerns. Friendly and courteous. Always asked if I have more questions.
    Mar 08, 2024
    Dr Prionas is compassionate and treats each patient as an individual, not a statistic. He is well educated and has shown proven willingness to help his patients even when the path is unclear. He took the initiative to reach out to his colleagues and seek advice on my case then provided me sound options to best treat my case.
    Dec 05, 2023
    I would not hesitate to recommend Dr Prionas to anyone. Now that I am one year out from my whole breast radiation treatment w/him I can say went extremely well because of his meticulous attention & care. He listens carefully, explains dense medical Information in a way that is easy for a patient to understand and most importantly, does not dismiss concerns as trivial.
    Nov 18, 2023
    He's very passionate about his job and patients.
    Oct 21, 2023
    I had an excellent experience. I felt well treated and very professionally informed about my treatment options by my doctor.
    Oct 12, 2023
    Excellent visit. Very informative and professional with genuine caring
    Oct 10, 2023
    This was the clearest explanation to date of my condition and possible next steps
    Sep 12, 2023
    Very informative, helpful and friendly.

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