Casey Williamson, M.D., M.A.S. (he/him)

  • Assistant Professor of Radiation Medicine, School of Medicine

Biography

Dr. Williamson specializes in caring for patients with gynecologic and genitourinary cancers with expertise in both external beam radiation therapy and brachytherapy. Dr. Williamson chose radiation oncology because it allows him to treat patients with cancer with the highest level of precise technology. Every patient's situation is unique and deserves a personalized approach.

Dr. Williamson also strives to ensure clear communication and understanding, even in very complicated situations. It is a tremendous privilege to work with patients experiencing cancer and with an amazing team at OHSU. Dr. Williamson also has an extensive research background with special focus on advanced imaging and radiation treatment planning as well as outcomes following treatment planning. Outside of work, Dr. Williamson loves spending time with his wife and son. He is an avid skier and enjoys running, hiking, camping, and reading.

Special focus: cervical cancer, endometrial cancer, vulvar cancer, prostate cancer, bladder cancer, kidney cancer, testis cancer, penile cancer

Education and training

  • Degrees

    • M.D., 2017, UC San Diego School of Medicine
    • M.A.Sc., 2016, Clinical Research, UC San Diego School of Medicine
    • B.A., 2010, University of Southern California

  • Internship

    • Internal Medicine, UCLA-Olive View, 2018

  • Residency

    • Radiation Oncology, UC San Diego, 2022

Memberships and associations:

  • American Society for Radiation Oncology
  • American Brachytherapy Society

Publications

Elsevier pure profile

Publications

  • Redefining Candidates for Deintensification in Locoregionally Advanced P16+ Oropharyngeal Cancer Based on Relative Risk

    International Journal of Radiation Oncology Biology Physics
    1. Ryan T. Morse
    2. Tyler J. Nelson
    3. Hannah C. Liu
    4. Prangrawee Sangchan
    5. Bhargava Chitti
    6. Caroline A. Thompson
    7. Gerald Henderson
    8. Casey W. Williamson
    9. Jake R. Todd
    10. Divya P. Prajapati
    11. Lucas K. Vitzthum
    12. Andrew B. Sharabi
    13. Jingjing Zou
    14. Assuntina G. Sacco
    15. Charley S. Coffey
    16. Parag Sanghvi
    17. Douglas A. Rahn
    18. Christopher E. Lominska
    19. Colette J. Shen
    20. Bhishamjit S. Chera
    21. Loren K. Mell

  • Safety and Efficacy of Neoadjuvant Docetaxel and Radiotherapy in Localized High-Risk Prostate Cancer

    American Journal of Clinical Oncology: Cancer Clinical Trials
    1. Kim C. Ohaegbulam
    2. Carl M. Post
    3. Paige E. Farris
    4. Mark Garzotto
    5. Tomasz M. Beer
    6. Arthur Hung
    7. Casey W. Williamson

  • Optimized Atlas-Based Auto-Segmentation of Bony Structures from Whole-Body Computed Tomography

    Practical Radiation Oncology
    1. Lei Gao
    2. Tahir I. Yusufaly
    3. Casey W. Williamson
    4. Loren K. Mell

  • Outcomes from a 3-fraction high-dose-rate brachytherapy regimen for patients with cervical cancer

    Brachytherapy
    1. Casey W. Williamson
    2. Nikhil V. Kotha
    3. Jingjing Zou
    4. Derek Brown
    5. Daniel Scanderbeg
    6. Dominique Rash
    7. John Einck
    8. Catheryn Yashar
    9. Loren K. Mell
    10. Jyoti Mayadev

  • Quantitative prediction of aspiration risk in head and neck cancer patients treated with radiation therapy

    Oral Oncology
    1. Hannah C. Liu
    2. Casey W. Williamson
    3. Jingjing Zou
    4. Jacob R. Todd
    5. Tyler J. Nelson
    6. Lindsay M. Hill
    7. Kristen E. Linnemeyer
    8. Gerald Henderson
    9. Puja Madgula
    10. Brian Faung
    11. Assuntina G. Sacco
    12. Lucas K. Vitzthum
    13. Philip A. Weissbrod
    14. Liza S. Blumenfeld
    15. Loren K. Mell

  • Bias Reduction through Analysis of Competing Events (BRACE) Correction to Address Cancer Treatment Selection Bias in Observational Data

    Clinical Cancer Research
    1. Casey W. Williamson
    2. Tyler J. Nelson
    3. Caroline A. Thompson
    4. Lucas K. Vitzthum
    5. Kaveh Zakeri
    6. Paul J. Riviere
    7. Alex K. Bryant
    8. Andrew B. Sharabi
    9. Jingjing Zou
    10. Loren K. Mell

  • Disparities in time to start of definitive radiation treatment for patients with locally advanced cervical cancer

    International Journal of Gynecological Cancer
    1. Nikhil V. Kotha
    2. Casey W. Williamson
    3. Loren K. Mell
    4. James D. Murphy
    5. Elena Martinez
    6. Pratibha S. Binder
    7. Jyoti S. Mayadev

  • Improved Prognosis of Treatment Failure in Cervical Cancer with Nontumor PET/CT Radiomics

    Journal of Nuclear Medicine
    1. Tahir I. Yusufaly
    2. Jingjing Zou
    3. Tyler J. Nelson
    4. Casey W. Williamson
    5. Aaron Simon
    6. Meenakshi Singhal
    7. Hannah Liu
    8. Hank Wong
    9. Cheryl C. Saenz
    10. Jyoti Mayadev
    11. Michael T. McHale
    12. Catheryn M. Yashar
    13. Ramez Eskander
    14. Andrew Sharabi
    15. Carl K. Hoh
    16. Sebastian Obrzut
    17. Loren K. Mell

  • Incomplete cisplatin regimens in chemoradiation and its effect on outcomes for locally advanced cervical cancer

    International Journal of Gynecological Cancer
    1. Nikhil V. Kotha
    2. Casey W. Williamson
    3. Kyle V. Marra
    4. Michael McHale
    5. Loren K. Mell
    6. Jyoti S. Mayadev

  • Positron Emission Tomography-Guided Bone Marrow-Sparing Radiation Therapy for Locoregionally Advanced Cervix Cancer

    International Journal of Radiation Oncology Biology Physics
    1. Casey W. Williamson
    2. Igor Sirák
    3. Ronghui Xu
    4. Lorraine Portelance
    5. Lichun Wei
    6. Rafal Tarnawski
    7. Umesh Mahantshetty
    8. Elena S. Heide
    9. Catheryn M. Yashar
    10. Michael T. McHale
    11. Walter Bosch
    12. Jessica Lowenstein
    13. Cheryl C. Saenz
    14. Steve Plaxe
    15. Ramez Eskander
    16. John Einck
    17. Arno J. Mundt
    18. Jyoti Mayadev
    19. Loren K. Mell

  • Validation of NRG Oncology's prognostic nomograms for oropharyngeal cancer in the Veterans Affairs database

    Cancer
    1. Tyler J. Nelson
    2. Caroline A. Thompson
    3. Jingjing Zou
    4. Abhishek Kumar
    5. Prangrawee Sangchan
    6. Casey W. Williamson
    7. Lucas K. Vitzthum
    8. Andrew B. Sharabi
    9. James D. Murphy
    10. Carole A. Fakhry
    11. Loren K. Mell

  • Advances in External Beam Radiation Therapy and Brachytherapy for Cervical Cancer

    Clinical Oncology
    1. C. W. Williamson
    2. H. C. Liu
    3. J. Mayadev
    4. L. K. Mell

  • Standardized uptake value illuminates tumor inflammation and treatment response

    Clinical Cancer Research
    1. Casey W. Williamson
    2. Dmitriy Zamarin
    3. Jyoti Mayadev

  • A Multi-atlas Approach for Active Bone Marrow Sparing Radiation Therapy

    International Journal of Radiation Oncology Biology Physics
    1. Tahir Yusufaly
    2. Austin Miller
    3. Ana Medina-Palomo
    4. Casey W. Williamson
    5. Hannah Nguyen
    6. Jessica Lowenstein
    7. Charles A. Leath
    8. Ying Xiao
    9. Kevin L. Moore
    10. Katherine M. Moxley
    11. Carlos M. Chevere-Mourino
    12. Tony Y. Eng
    13. Tarrick Zaid
    14. Loren K. Mell

  • Comparison of Hematologic Toxicity and Bone Marrow Compensatory Response in Head and Neck vs. Cervical Cancer Patients Undergoing Chemoradiotherapy

    Frontiers in Oncology
    1. Lucas K. Vitzthum
    2. Elena S. Heide
    3. Helen Park
    4. Casey W. Williamson
    5. Paige Sheridan
    6. Minh Phuong Huynh-Le
    7. Igor Sirak
    8. Lichun Wei
    9. Rafal Tarnawski
    10. Umesh Mahantshetty
    11. Cammie Nguyen
    12. Jyoti Mayadev
    13. Catheryn M. Yashar
    14. Assuntina G. Sacco
    15. Loren K. Mell

  • Bone Marrow-sparing Intensity Modulated Radiation Therapy With Concurrent Cisplatin For Stage IB-IVA Cervical Cancer

    International Journal of Radiation Oncology Biology Physics
    1. Loren K. Mell
    2. Igor Sirák
    3. Lichun Wei
    4. Rafal Tarnawski
    5. Umesh Mahantshetty
    6. Catheryn M. Yashar
    7. Michael T. McHale
    8. Ronghui Xu
    9. Gordon Honerkamp-Smith
    10. Ruben Carmona
    11. Mary Wright
    12. Casey W. Williamson
    13. Linda Kasaová
    14. Nan Li
    15. Stephen Kry
    16. Jeff Michalski
    17. Walter Bosch
    18. William Straube
    19. Julie Schwarz
    20. Jessica Lowenstein
    21. Steve B. Jiang
    22. Cheryl C. Saenz
    23. Steve Plaxe
    24. John Einck
    25. Chonlakiet Khorprasert
    26. Paul Koonings
    27. Terry Harrison
    28. Mei Shi
    29. A. J. Mundt

  • Feasibility of atlas-based active bone marrow sparing intensity modulated radiation therapy for cervical cancer

    Radiotherapy and Oncology
    1. Nan Li
    2. Sonal S. Noticewala
    3. Casey W. Williamson
    4. Hanjie Shen
    5. Igor Sirak
    6. Rafal Tarnawski
    7. Umesh Mahantshetty
    8. Carl K. Hoh
    9. Kevin L. Moore
    10. Loren K. Mell

  • Longitudinal Changes in Active Bone Marrow for Cervical Cancer Patients Treated With Concurrent Chemoradiation Therapy

    International Journal of Radiation Oncology Biology Physics
    1. Sonal S. Noticewala
    2. Nan Li
    3. Casey W. Williamson
    4. Carl K. Hoh
    5. Hanjie Shen
    6. Michael T. McHale
    7. Cheryl C. Saenz
    8. John Einck
    9. Steven Plaxe
    10. Florin Vaida
    11. Catheryn M. Yashar
    12. Loren K. Mell

  • Improved method to stratify elderly patients with cancer at risk for competing events

    Journal of Clinical Oncology
    1. Ruben Carmona
    2. Kaveh Zakeri
    3. Garrett Green
    4. Lindsay Hwang
    5. Sachin Gulaya
    6. Beibei Xu
    7. Rohan Verma
    8. Casey W. Williamson
    9. Daniel P. Triplett
    10. Brent S. Rose
    11. Hanjie Shen
    12. Florin Vaida
    13. James D. Murphy
    14. Loren K. Mell

  • Prospective Validation of a High Dimensional Shape Model for Organ Motion in Intact Cervical Cancer

    International Journal of Radiation Oncology Biology Physics
    1. Casey W. Williamson
    2. Garrett Green
    3. Sonal S. Noticewala
    4. Nan Li
    5. Hanjie Shen
    6. Florin Vaida
    7. Loren K. Mell

  • Fat composition changes in bone marrow during chemotherapy and radiation therapy

    International Journal of Radiation Oncology Biology Physics
    1. Ruben Carmona
    2. Jakub Pritz
    3. Mark Bydder
    4. Sachin Gulaya
    5. He Zhu
    6. Casey W. Williamson
    7. Christian S. Welch
    8. Florin Vaida
    9. Graeme Bydder
    10. Loren K. Mell

  • Suppression of tumor invasion and metastasis by concurrent inhibition of c-Met and VEGF signaling in pancreatic neuroendocrine tumors

    Cancer discovery
    1. Barbara Sennino
    2. Toshina Ishiguro-Oonuma
    3. Ying Wei
    4. Ryan M. Naylor
    5. Casey W. Williamson
    6. Vikash Bhagwandin
    7. Sebastien P. Tabruyn
    8. Weon Kyoo You
    9. Harold A. Chapman
    10. James G. Christensen
    11. Dana T. Aftab
    12. Donald M. McDonald

  • VEGF and c-Met blockade amplify angiogenesis inhibition in Pancreatic Islet Cancer

    Cancer Research
    1. Weon Kyoo You
    2. Barbara Sennino
    3. Casey W. Williamson
    4. Beverly Falcón
    5. Hiroya Hashizume
    6. Li Chin Yao
    7. Dana T. Aftab
    8. Donald M. McDonald