Why radiotherapy is used

Your doctor may prescribe radiotherapy to destroy the tumour. The aim is to cure the cancer and doctors call this radical radiotherapy. The length of your course of treatment depends on where in your body you need treatment and the size of the cancer. Curative radiotherapy may be combined with other treatments, such as surgery, chemotherapy, hormonal therapy or biological therapy.

You may have radiotherapy to relieve symptoms, for example to reduce pain. This is called palliative treatment and is usually given over a short time. You may have your treatment in a single day or over a few days. There is more information about palliative radiotherapy in this section of CancerHelp UK.

Radiotherapy is given before surgery to shrink a tumour and so make it easier to remove, or to reduce the risk of spreading it during surgery. This type of treatment is frequently used in some cancers, such as rectal cancer. It is called neoadjuvant treatment or preoperative radiotherapy. Chemotherapy can also be given as neoadjuvant treatment, either alone or with radiotherapy. Chemotherapy and radiotherapy given together is called chemoradiation.

Radiotherapy after surgery is given to kill off any tiny areas of the tumour that may have been left after the operation. It is often used in breast cancer, rectal cancer, and cancers of the head and neck area. It is called adjuvant treatment or postoperative radiotherapy. Chemotherapy can also be given as adjuvant treatment, either alone or with radiotherapy. Chemotherapy and radiotherapy given together is called chemoradiation.

Total body irradiation (TBI) is a type of radiotherapy sometimes given to patients having a bone marrow transplant or stem cell transplant, for example for some types of leukaemia or lymphoma. Radiation is given to the whole body to destroy the bone marrow cells. You are then given new bone marrow either from

• A donor
• Or marrow taken from you before your irradiation.

You can find detailed information about bone marrow and stem cell transplants in our cancer treatment section.