This treatment uses high-energy radiation beams to destroy cancer cells. It is used either before or after surgery. When used before surgery it aims to reduce the size of the tumour so it can be operated on and removed. Radiotherapy is also very effective when given after surgery. This is particularly so for intermediate and high grade tumours and when the margins are quite close. In this case, the aim is to kill off any local cancer cells which remain in the area of the tumour. Your doctor will advise which is best for you.
Some types of sarcoma can be treated using Proton Beam Therapy, which is a type of radiotherapy that uses high-energy proton beams rather than high-energy radiation beams to deliver a dose of radiotherapy. For most patients there is no strong evidence that PBT is better than x-ray radiotherapy in treating sarcoma. For a lot of sarcoma patients x-ray radiotherapy may be just as or more effective to treat their type of cancer. You can read more about Proton Beam Therapy here.