Mayo Clinic's Proton Beam Therapy Program delivers precise radiotherapy with lower doses of radiation to healthy tissue. This highly targeted therapy is ideal for people with tumors close to or in vital organs and for young people, whose organs are still developing. The Mayo Clinic Proton Beam Therapy Program uses the latest form of proton beam therapy — pencil beam scanning. This advance allows Mayo radiation oncologists to deliver higher doses of radiation to cancer cells while sparing healthy tissue. Mayo Clinic offers proton beam therapy in Arizona and Minnesota.

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