Erik D. Assarsson, MD

Headshot of Erik D. Assarsson, MD

Dr. Assarsson treats a variety of cancers, with a focus on colon and other GI cancers, lung cancer, prostate cancer, endometrial cancer, and skin cancer. He has significant expertise in the use of advanced LINAC-based radiation therapy techniques and brachytherapy. A graduate of University of Medicine and Dentistry of New Jersey (UMDNJ), Dr. Assarsson completed a radiation oncology residency at UMDNJ-Cooper Hospital University Medical Center.

Radiation Oncology
Primary Practice:
Main Line Radiation Oncology
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Radiation Oncology

Conditions and Treatments


Main Line Radiation Oncology

801 County Line Road
Bryn Mawr Hospital, Radiation Oncology
Bryn Mawr, PA 19010

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Main Line Radiation Oncology

1078 West Baltimore Pike
Riddle Hospital, Radiation Oncology Center, Health Center 1, Ground Floor
Media, PA 19063

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Main Line Radiation Oncology

3855 West Chester Pike
Main Line Health Newtown Square, Cancer Center, Suite 100
Newtown Square, PA 19073

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Erik D. Assarsson, MD

Erik D. Assarsson, MD, is a member of the Main Line Health medical staff in radiation oncology at Bryn Mawr Hospital and is board certified in that specialty. He serves as Division Chief of Radiation Oncology for the Main Line Health system. After earning a Bachelor of Science degree in neural science at Brown University in Rhode Island, Dr. Assarsson worked as an analyst at Brown's High Energy Physics Lab. He went on to develop the Andrology Center at the College of Physicians and Surgeons in New York City. He earned his medical degree at UMDNJ-Robert Wood Johnson Medical School where he completed an internship in internal medicine in 1984. Dr. Assarsson completed his residency in radiation oncology at UMDNJ-Cooper Hospital-University Medical Center in 1993. Since then, he has practiced as an attending physician in the radiation oncology department at both Bryn Mawr Hospital and Main Line Health Center in Newtown Square. Dr. Assarsson is actively involved with institutional and national clinical trials. He is a member of the American Society for Therapeutic Radiology and Oncology, the American Society of Clinical Oncology and the American College of Radiology. His clinical interests include cancers of the prostate, lung, breast, gastrointestinal tract and brain. He has received media coverage for the development of advanced and innovative treatment programs using respiratory gating, high-dose rate (HDR) brachytherapy, image-guided radiotherapy (IGRT), intensity-modulated radiation therapy (IMRT), stereotactic body radiation therapy (SBRT) and stereotactic radiosurgery (SRS). Both the Radiation Oncology Center at Bryn Mawr Hospital and Main Line Health Center in Newtown Square are accredited by the American College of Radiology as part of the hospital's comprehensive Cancer Center. Leading-edge technology and advanced treatment are offered at both convenient locations. Dr. Assarsson lives with his wife and two daughters in Newtown Square, Pennsylvania.

Primary Affiliation:
Bryn Mawr Hospital
Years Experience:

Education and Training


  • Medical School
    University of Medicine & Dentistry-New Jersey
  • Residency
    Cooper Hospital-University Medical Center
  • Internship
    Robert Wood Johnson

Awards and Memberships

  • Philadelphia Magazine Top Doc - 2024
  • American Society for Therapeutic Radiology and Oncology
  • American College of Radiology
  • Pennsylvania Medical Society
  • Pennsylvania Radiological Society
  • Montgomery County Medical Society

Patient Reviews

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