Nicolas Prionas, MD, PhD
Assistant Professor
Radiation Oncology
School of Medicine

He treats people with malignancies of all disease sites and has expertise in specialized procedures including intensity modulated radiotherapy (IMRT), stereotactic ablative/body radiotherapy (SABR/SBRT), stereotactic radiosurgery (SRS), image-guided radiotherapy (IGRT), and intra-operative radiotherapy (IORT).

Dr. Prionas received a B.S. in Biomedical Computation and a M.S. in Biomechanical Engineering from Stanford University. He completed joint MD/PhD training in Biomedical Engineering at the University of California, Davis School of Medicine where his research specialized in quantitative imaging and radiotherapy using a novel dedicated breast computed tomography platform. Prior to arriving at UCSF, he completed Radiation Oncology Residency training at Stanford University where he was awarded the Malcolm A. Bagshaw Award for leadership and outstanding scientific achievement. Dr. Prionas is the Director of Quality and his research focuses on technologies that increase access to equitable care.

• Positive margins after mastectomy in patients with invasive lobular carcinoma of the breast: Incidence and management strategies.
  American journal of surgery 2021 Hewitt KC, Miller P, Piper M, Prionas N, Son JD, Alvarado M, Esserman LJ, Wong JM, Ewing C, Mukhtar RA
• A pilot, randomized controlled trial of telementorship: A useful tool during social distancing.
  Journal of clinical and translational research 2021 Prionas ND, Kung TH, Dohn A, Piro N, von Eyben R, Katznelson L, Caruso TJ
• Dose-response with stereotactic body radiotherapy for prostate cancer: A multi-institutional analysis of prostate-specific antigen kinetics and biochemical control.
  Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2020 Levin-Epstein RG, Jiang NY, Wang X, Upadhyaya SK, Collins SP, Suy S, Aghdam N, Mantz C, Katz AJ, Miszczyk L, Napieralska A, Namysl-Kaletka A, Prionas N, Bagshaw H, Buyyounouski MK, Cao M, Agazaryan N,…
• Telemedicine in Radiation Oncology: Is It Here to Stay? Impacts on Patient Care and Resident Education.
  International journal of radiation oncology, biology, physics 2020 Gutkin PM, Prionas ND, Minneci MO, Allen E, Balazy KE, Rahimy E, Chang DT, Horst KC
• Intensity modulated Ir-192 brachytherapy using high-Z 3D printed applicators.
  Physics in medicine and biology 2020 Skinner LB, Niedermayr T, Prionas N, Perl J, Fahimian B, Kidd EA
• Prostate-specific antigen kinetics and biochemical control following stereotactic body radiation therapy, high dose rate brachytherapy, and low dose rate brachytherapy: A multi-institutional analysis of 3502 patients.
  Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2020 Levin-Epstein R, Cook RR, Wong JK, Stock RG, Jeffrey Demanes D, Collins SP, Aghdam N, Suy S, Mantz C, Katz AJ, Nickols NG, Miszczyk L, Napieralska A, Namysl-Kaletka A, Prionas ND, Bagshaw H, …
• Predicting Survival for Patients With Metastatic Disease.
  International journal of radiation oncology, biology, physics 2019 Benson KRK, Aggarwal S, Carter JN, von Eyben R, Pradhan P, Prionas ND, Bui JL, Soltys SG, Hancock S, Gensheimer MF, Koong AC, Chang DT
• Multi-Institutional Analysis of Prostate-Specific Antigen Kinetics After Stereotactic Body Radiation Therapy.
  International journal of radiation oncology, biology, physics 2019 Jiang NY, Dang AT, Yuan Y, Chu FI, Shabsovich D, King CR, Collins SP, Aghdam N, Suy S, Mantz CA, Miszczyk L, Napieralska A, Namysl-Kaletka A, Bagshaw H, Prionas N, Buyyounouski MK, Jackson WC, Spratt …
• Long-term Outcomes of Stereotactic Body Radiotherapy for Low-Risk and Intermediate-Risk Prostate Cancer.
  JAMA network open 2019 Kishan AU, Dang A, Katz AJ, Mantz CA, Collins SP, Aghdam N, Chu FI, Kaplan ID, Appelbaum L, Fuller DB, Meier RM, Loblaw DA, Cheung P, Pham HT, Shaverdian N, Jiang N, Yuan Y, Bagshaw H, Prionas N, …
• Increases in Serial Pretreatment 18F-FDG PET-CT Metrics Predict Survival in Early Stage Non-Small Cell Lung Cancer Treated With Stereotactic Ablative Radiation Therapy.
  Advances in radiation oncology 2018 Prionas ND, von Eyben R, Yi E, Aggarwal S, Shaffer J, Bazan J, Eastham D, Maxim PG, Graves EE, Diehn M, Gensheimer MF, Loo BW
• 18F-EF5 PET-based Imageable Hypoxia Predicts Local Recurrence in Tumors Treated With Highly Conformal Radiation Therapy.
  International journal of radiation oncology, biology, physics 2018 Qian Y, Von Eyben R, Liu Y, Chin FT, Miao Z, Apte S, Carter JN, Binkley MS, Pollom EL, Harris JP, Prionas ND, Kissel M, Simmons A, Diehn M, Shultz DB, Brown JM, Maxim PG, Koong AC, Graves EE, Loo BW
• SBRT and HDR brachytherapy produce lower PSA nadirs and different PSA decay patterns than conventionally fractionated IMRT in patients with low- or intermediate-risk prostate cancer.
  Practical radiation oncology 2015 Kishan AU, Wang PC, Upadhyaya SK, Hauswald H, Demanes DJ, Nickols NG, Kamrava M, Sadeghi A, Kupelian PA, Steinberg ML, Prionas ND, Buyyounouski MK, King CR
• Differentiation of ductal carcinoma in-situ from benign micro-calcifications by dedicated breast computed tomography.
  European journal of radiology 2015 Aminololama-Shakeri S, Abbey CK, Gazi P, Prionas ND, Nosratieh A, Li CS, Boone JM, Lindfors KK
• Development of a patient-specific two-compartment anthropomorphic breast phantom.
  Physics in medicine and biology 2012 Prionas ND, Burkett GW, McKenney SE, Chen L, Stern RL, Boone JM
• Kilovoltage rotational external beam radiotherapy on a breast computed tomography platform: a feasibility study.
  International journal of radiation oncology, biology, physics 2012 Prionas ND, McKenney SE, Stern RL, Boone JM
• Persistent CT nephrograms following cardiac catheterisation and intervention: initial observations.
  Insights into imaging 2011 Katzberg RW, Monsky WL, Prionas ND, Sidhar V, Southard J, Carlson J, Boone JM, Lin TC, Li CS
• The characterization of breast anatomical metrics using dedicated breast CT.
  Medical physics 2011 Huang SY, Boone JM, Yang K, Packard NJ, McKenney SE, Prionas ND, Lindfors KK, Yaffe MJ
• Experimentally determined spectral optimization for dedicated breast computed tomography.
  Medical physics 2011 Prionas ND, Huang SY, Boone JM
• Contrast-enhanced dedicated breast CT: initial clinical experience.
  Radiology 2010 Prionas ND, Lindfors KK, Ray S, Huang SY, Beckett LA, Monsky WL, Boone JM
• Longitudinal volume analysis from computed tomography: Reproducibility using adrenal glands as surrogate tumors.
  Journal of medical physics 2010 Prionas ND, Gillen MA, Boone JM
• Volume assessment accuracy in computed tomography: a phantom study.
  Journal of applied clinical medical physics 2010 Prionas ND, Ray S, Boone JM