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Fox Chase Cancer Center

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A Century of Excellence

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Mark L. Sobczak, MD

Chief Network Officer and Vice President,
Fox Chase Cancer Center

Mark L. Sobczak, MD

Dr. Sobczak is a radiation oncologist and a recognized expert in the care of genitourinary malignancies. He joined the Fox Chase Cancer Center after a notable career in the US Navy Medical Corps where he organized and led the first comprehensive oncology department in military medicine. This was followed by several years of experience in the planning, development, and growth of free-standing radiation oncology centers with 21st Century Oncology. Dr. Sobczak has been a pioneer in the planning, implementation and utilization of electronic medical records in oncology.


U.S. Naval Academy, Annapolis, MD, Class of 1977
Doctor of Medicine, Uniformed Services University of the Health Sciences, Bethesda, MD, Class of 1987

Professional Affiliations:

American College of Radiology

American College of Radiation Oncology

American Medical Association

American Society for Therapeutic Radiology and Oncology

Genitourinary Steering Committee of the Radiation Therapy Oncology Group

Pennsylvania Medical Society

Naval Academy Alumni Association


American Board of Radiology

Therapeutic Radiology


Finalist, Astronaut Mission Specialist, NASA

Distinguished Graduate, Massachusetts General Hospital

Clinical Oncology Fellow, American Cancer Society

Distinguished Graduate, United States Naval Academy

Clinical Interests/Research:

Dr. Sobczak's clinical interests include Volumetric Modulated Arc Therapy, Intensity Modulated Radiation Therapy, Image Guided Radiation Therapy, and Brachytherapy, including HDR and LDR seeds; 3-dimensional treatment planning. His research interests include predictive biomarkers for genitourinary cancers, cancer genetics, and cancer prevention and control.