Proton therapy is a form of radiation treatment that delivers an exact, high dose of radiation to a tumor site while sparing surrounding healthy tissue and organs from damage, reducing the risk of negative side effects during and following treatment. It is non-invasive, non-surgical, and precise, making it an ideal treatment for localized cancers that have not spread to other parts of the body. Proton therapy may be an option for other diagnoses and indications not listed below.