Mark L. Sobczak, MD

Clinical Locations

Primary Location

Fox Chase Cancer Center
333 Cottman Avenue
Philadelphia, PA 19111


Clinical Director, Department of Radiation Oncology

Assistant Professor, Department of Radiation Oncology

Kidney, Bladder, and Prostate Cancer TRDG Member

Treatment Focus

Intensity Modulated Radiation Therapy; Image Guided Radiation Therapy; Brachytherapy, including HDR, LDR seeds, and PBI; 3-dimensional treatment planning; Clinical research 

Key Awards

  • America's Top Doctors®2017
  • Philadelphia Magazine Top Doctors, 2017

Education, Training & Credentials

Educational Background

  • Resident, Radiation Oncology, Massachusetts General Hospital, Boston, MA 
  • MD, Uniformed Services, University of the Health Sciences, Bethesda, MD, 1987


  • American Board of Radiology
  • Therapeutic Radiology


  • National Comprehensive Cancer Network (NCCN)
    • NCCN Affiliate Forum
  • American College of Radiology
  • American College of Radiology Oncology
  • American Medical Association
  • American Society for Therapeutic Radiology and Oncology
  • Association of Freestanding Radiation Oncology Centers
  • Delaware Medical Society
  • Maryland Medical Society
  • Lower Shore (of Maryland) Medical Society
  • Naval Academy Alumni Association 

Honors & Awards

  • Finalist, Astronaut Mission Specialist, NASA, 1991
  • Distinguished Graduate, Massachusetts General Hospital, 1991
  • Clinical Oncology Fellow, American Cancer Society, 1990-1991
  • Distinguished Graduate, United States Naval Academy, 1977
  • America's Top Doctors®, 2017
  • Philadelphia Magazine Top Doctors, 2017
Patient Stories

Abu-Methuselah Bradley


Abu-Methuselah Bradley


At 6’4” inches tall and a trim 208 pounds, Abu-Methuselah Bradley was the epitome of good health.  An athlete with a muscular build, this pharmaceutical sales representative and part-time church pastor enjoyed bike-riding, running and other outdoor activities. In September, 2013, at the age of 39, this married father of two noticed blood in his urine and took quick action. “I went right to the ER,” said Abu. “They ran some tests but couldn’t really tell me what was wrong.”