Fact Sheet 13

Radiotherapy

Radiotherapy is used to treat or manage many types of cancer and over half of cancer patients will receive radiotherapy at some point in their treatment.

How does it work?

Radiotherapy is a way of treating or managing cancer using radiation. It works by damaging cells in the area being treated. Normal cells are able to repair this damage but cancer cells can’t do this and so are destroyed.

Cancer patients will be given radiotherapy for different reasons and for some patients it is the only treatment that they require.

Radical radiotherapy is used to try to completely get rid of cancer cells. The radiotherapy is given in small doses five days a week, often for four to five weeks.

Prophylactic radiotherapy is given to stop cancer coming back in the same area after surgery and to reduce the risk of the cancer spreading (metastasising) to other organs. The radiotherapy is given in small doses five days a week for several weeks.

Palliative radiotherapy is used when cancer can’t be cured and is given to treat symptoms from cancer or to control the growth of the cancer. It is given in a single dose or a few doses over a much shorter period of time.

Methods

Radiotherapy can be given as teletherapy (also known as external beam radiotherapy), which is when a beam of radiation is aimed at the area to be treated from a machine located away from the patient. Other forms of radiotherapy are high or low dose brachytherapy, which is when a radioactive source is placed on or in a tumour.

Planning

All patients who are to have radiotherapy need individually tailored treatment so that it is given accurately. A lot of information is needed so the doctor can target the tumour, while minimising damage to the healthy tissue. This is called treatment planning and there are a number of ways of doing this.

Simulator planning is done using a specialised x-ray machine that can do the same things as the treatment machines, except deliver treatment. The simulator allows the doctor to carefully look at the area that needs treatment and plan it precisely. During the planning, the radiographer will draw some marks on the skin using a felt tip pen, and when the doctor and radiographer are happy that they have an accurate plan the radiographer may need to make two to three permanent marks called tattoos. These tattoos are the size of a pinhead and are used to ensure that the radiotherapy is given to exactly the right place during treatment.

ACQSIM planning is done using a scanner. Some patients may need to have an intravenous injection before the scan to show up the area to be treated better. The scan usually takes about 15 minutes and the information from the scan is used to produce a treatment map. Sometimes it's necessary to take some x-rays and measurements to check the treatment map and this is done on the simulator.

Treatment

When radiotherapy treatment is being given by external beam it’s important that the patient is in exactly the same position for each treatment. The radiographers will often use pillows and wedges to make sure that the patient is comfortable and in the correct position. Patients having radiotherapy to the head or neck area may need to have a mould made to keep them in the right position, as it's very hard to keep your head and neck still.

Moulds are made from clear Perspex after a plaster cast has been made of the head and neck. Once the Perspex mould has been made, the radiotherapy is planned while the patient is wearing the mould and marks are drawn on the mask instead of the skin.

Once the radiographers are happy that the patient is in the correct position they will leave the room to switch the treatment machine on. When the machine is on it makes a buzzing noise. The radiographers watch closely on a television screen. Treatment only lasts a few minutes and does not hurt.

Side effects

Side effects are different depending on the part of the body being treated. Most side effects are temporary but some may continue for weeks or months after treatment is finished.

• Hair loss (alopecia)
• Cerebral oedema (excess fluid accumulating in the brain) can cause changes in mental state, restlessness, irritability, impaired pupil reactions, headache, increase in blood pressure, decrease in pulse and respiration, and nausea.
• Dry or sore mouth or throat, changes in taste sensation, skin thickening
• Inflammation of the gullet, indigestion, nausea, lung inflammation
• Nausea and vomiting, diarrhoea, cystitis
• Sexual dysfunction. In males treatment of the abdomen area can cause impotence, sterility. In females it can cause sterility, loss of sexual desire. Irradiation of the pelvis may cause tightening of the vagina, loss of vaginal lubrication, inflammation or ulceration of the vagina. Some women may find intercourse painful.
• Treatment of red bone marrow may cause infection and impaired healing, anaemia, increased tiredness, bruising and bleeding

As well as treating cancer the radiotherapy temporarily damages the outer layers of skin. During treatment the skin cannot repair itself as it normally would and it can become sore. But once treatment has finished the skin generally recovers quite quickly - usually within a month. The level of reaction can depend on your skin type, the type and number of treatments you have, and how you would normally react to the sun.

Skin side effects usually happen later on in the course of radiotherapy treatment or sometimes a few weeks after treatment has finished. Many patients do not have any skin changes at all. Skin care advice will be given to the patients by the staff treating them.

A common side effect of radiotherapy is tiredness and fatigue, which often prevents patients from doing normal everyday activities. Fatigue and tiredness are normal results of having radiotherapy and begin in the first week of treatment, reaching a peak after two weeks of treatment and gradually disappearing a few weeks after treatment has finished.

Oral Changes Caused By Radiotherapy To The Head And Neck

Some people who get radiation to the head and neck have redness and soreness in the mouth, a dry mouth, trouble swallowing, changes in taste, or nausea. Other possible side effects include a loss of taste, earaches, and swelling. You may lose your hair, your skin texture might change, and your jaw may feel stiff. If you get radiation therapy to the head or neck, you need to take good care of your teeth, gums, mouth, and throat.

Here are a few tips that may help you manage mouth problems:

•  Avoid spices and coarse foods such as raw vegetables, dry crackers, and nuts.
• Do not eat or drink very hot or very cold foods.
•  Do not smoke, chew tobacco, or drink alcohol because tobacco and alcohol can make mouth sores worse.
• Stay away from sugary snacks.
• Ask your doctor or nurse to recommend a good mouthwash. The alcohol content in some mouthwashes has a drying effect on mouth tissues.
• Rinse your mouth with warm salt water every 1 to 2 hours as needed. (Use 1 teaspoon of salt in 1 quart of water.)
• Sip cool drinks often throughout the day.
•  Eat sugar-free candy or chew gum to help keep your mouth moist.
•  Moisten food with gravies and sauces to make eating easier.
• Ask your doctor or nurse about medicines to help treat mouth sores and control pain while eating.
  If these measures are not enough, ask your dentist about hydrating mouth rinses. Mouth dryness may be a problem even after treatment is over.

Dental care
Radiation treatment of your head and neck can increase your chances of getting cavities. Mouth care to prevent problems will be an important part of your treatment. Before starting radiation therapy, get a complete check-up with your dentist. Ask your dentist to talk with your radiation oncologist before your treatments begin. If you have problem teeth, your dentist may suggest you have them removed before starting treatment. Radiation (and dry mouth) may damage them to the point where they will need to be removed. This may be harder to do after treatment has started.
If you wear dentures, they may no longer fit well because of swollen gums. If your dentures cause gum sores, you may need to stop wearing them until your radiation therapy is over because these sores can become infected.
Your dentist probably will want to see you during your radiation therapy to talk to you about caring for your mouth and teeth and help you deal with any soreness. Most likely, you will be told to do the following:

• Clean your teeth and gums with a very soft brush after meals and at least one other time each day.
• Use fluoride toothpaste that contains no abrasives.
• Use unwaxed dental tape to gently floss between teeth once a day.
• Rinse your mouth well with cool water or a baking soda solution after you brush. (Use 1 teaspoon of baking soda in 1 quart of water.)

Source: A number of articles

Disclaimer

While every effort has been made to ensure that the information given in this leaflet is accurate, not every treatment will be suitable or effective for every person. All content within Pure and Gentle SkinCare is provided for general information only, and should not be treated as a substitute for the medical advice of your own doctor or any other health care professional. Pure and Gentle SkinCare is not responsible or liable for any diagnosis made by a user based on the content of Pure and Gentle SkinCare website or advisers.  Always consult your own GP if you're in any way concerned about your health as he or she will be able to advise in greater detail.