Proton beam therapy is a type of external beam radiotherapy.
Proton beam therapy is only suitable for a small number of people. It is used to help reduce the risk of long-term side effects that can sometimes develop after standard radiotherapy. It can also be used to treat cancers that are close to important structures in the body (see below for more information). These cancers may be difficult to treat with standard radiotherapy or surgery.
Proton beam therapy is given using specialised equipment that is not available in all UK hospitals. You may be referred to a specialist hospital if your cancer doctor thinks it is a suitable treatment for you.