Our program

About Mayo Clinic's program

Mayo Clinic's Proton Beam Therapy Program is a new addition to the Mayo Clinic Cancer Center, the only National Cancer Institute-designated comprehensive cancer center with a multisite presence, with locations in Arizona, Florida and Minnesota.

The program differs from most other proton therapy programs in the United States because it exclusively features intensity-modulated proton beam therapy using pencil beam scanning.

This technology is an advance over current radiation and other proton therapy methods. The pencil beam conforms more closely to the tumor, better sparing surrounding healthy tissue from harm, and "painting" small groups of protons back and forth through a tumor. The accelerated protons fill the depth and contour of the tumor, allowing advantages over most other proton therapy systems, including:

  • Greater control of radiation doses
  • Shorter treatment times
  • Reduced side effects

The precision of pencil beam scanning makes it especially beneficial in treating tumors adjacent to critical and sensitive organs and structures, such as the brain, eye and spinal cord.

All eight treatment rooms at Mayo Clinic's two facilities feature this advanced technology.

Mayo's facilities

Mayo Clinic Proton Beam Therapy Program — Arizona campus.
Previous Next

The Mayo Clinic Proton Beam Therapy Program — Arizona campus.


One of Mayo Clinic's priorities is to continue to advance the science of proton therapy. Mayo Clinic proton beam therapy researchers will:

  • Conduct clinical studies
  • Enter patients on a registry to measure outcomes and improve care models and services for cancer patients
  • Foster collaborative research with other centers worldwide