Erik D. Assarsson, MD

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Practice Philosophy

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.

Practice Name
Bryn Mawr Hospital Radiation Oncology
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Locations and Appointments

Bryn Mawr Hospital
130 South Bryn Mawr Avenue
Bryn Mawr, PA 19010
  • Phone: 484.337.8510
  • Fax: 484.337.8695
  • Accessibility: Public Transportation

Radiation Oncology Center at Riddle Hosp
1078 West Baltimore Pike, HC 1/Ground FL
Media, PA 19063

MLH Center in Newtown Square, Suite 100
3855 West Chester Pike
Newtown Square, PA 19073

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About 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.

  • Gender: Male
  • Years of Experience: 29
  • Language: English
Specialties Accepting New Patients
Radiation Oncology Board certified since 1994
Primary Affiliation
Clinical Titles
  • Attending Physician
  • Bryn Mawr Campus Division Chief, Radiation Oncology


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

*Members of the Main Line Health medical staff are affiliated with Bryn Mawr Hospital, Lankenau Medical Center, Paoli Hospital and Riddle Hospital. Membership on the medical staff of any of our hospitals does not constitute an employment or agency relationship.

Awards & Memberships

Current Membership & Activities
  • American Society for Therapeutic Radiology and Oncology
  • American College of Radiology
  • Pennsylvania Medical Society
  • Pennsylvania Radiological Society
  • Montgomery County Medical Society

Patient Satisfaction Ratings and Comments