Radiation Oncology

The team at Memorial Radiation Oncology offers a comprehensive suite of the most advanced cancer treatment options, including:

  • Stereotactic Radiosurgery 
  • Options for Prostate Cancer
  • Brachytherapy
  • Mammosite
  • Respiratory Gating
  • Image guidance techniques for IMRT

Memorial's Radiation Oncology Center is not only nationally accredited through the American College of Radiation Oncology (ACRO), it is a national show-site for Varian Medical Systems, the leader in Radiation Therapy technology. Our staff of highly skilled physicians, physicists, dosimetrists, nurses and therapists work together with each patient to create a treatment plan customized to meet every need.

Cancer Center Radiation Oncologists


David Hornback, M.D.

David Hornback, M.D.

David Hornback, M.D., received his medical degree and completed his residency in radiation oncology at Indiana University School of Medicine, and served his internship through the Transitional Residency Program at St. Vincent Hospital & Healthcare Center.

Dr. Hornback specializes in stereotactic radiosurgery, high and low dose rate brachytherapy and prostate seed implants. He has extensive clinical research experience and maintains memberships in a number of professional associations, including the American Society for Therapeutic Radiology and Oncology, the American Society of Clinical Oncologists and the American Medical Association.

Samuel McGrath, M.D.

Samuel McGrath, M.D.

Samuel McGrath, M.D., is board certified radiation oncologist who has been practicing at Memorial Hospital of South Bend since 2010. He completed his internship and residency at William Beaumont Hospital in Royal Oak, Michigan. While at William Beaumont, Dr. McGrath had the opportunity to train under several nationally renowned radiation oncologists, acquiring valuable experience with advanced treatment planning and delivery techniques, including radiosurgery, brachytherapy and IMRT/IGRT. He received his medical degree from Wayne State University School of Medicine in Detroit, Michigan, graduating with highest distinction as a member of the Alpha Omega Alpha national medical honor society. Prior to this, he completed his bachelor’s degree in chemistry at Indiana University, Bloomington, where he graduated summa cum laude and as a member of the Phi Beta Kappa honor society. Dr. McGrath has published on a variety of topics, including prostate, breast and lung cancer. He is an active member of the American Society of Therapeutic Radiology and Oncology and treats all solid tumors at both the South Bend and Mishawaka offices.