Kaposi Sarcoma: Radiation Therapy
What is radiation therapy?
Radiation therapy uses high-energy beams of X-rays or particles to kill cancer cells
or stop them from growing.
When might radiation therapy be used?
Radiation therapy can be used to treat Kaposi sarcoma (KS) lesions near the surface
of the body, like on the skin or in the mouth. This is a type of local therapy. That
means it treats only the cancer that it's aimed at. It doesn’t treat the whole body.
Radiation therapy is most often used to treat lesions on the face. It can also be
used to treat lesions that are causing symptoms (like pain or swelling) but are too
big to be treated with other types of local therapy.
You'll meet with a team of cancer specialists to plan your radiation treatments. This
team will include a radiation oncologist who specializes in radiation therapy and
other types of healthcare professionals, such as radiation therapists and radiation
nurses.
What happens during radiation therapy?
The most common way to get radiation therapy for KS is from a large machine that focuses
beams of radiation on the cancer. This is called external beam radiation therapy.
The two main types of external radiation that can be used to treat KS lesions are:
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Electron-beam radiation therapy. This type is mostly used for lesions on the skin. It doesn't go deep into the skin
and the tissues below it. This limits the side effects it causes.
-
Photon-beam radiation therapy. This type tends to be used for lesions in the mouth or throat. It can penetrate deeper
into the body.
Your radiation oncologist will work with you to figure out the kind of radiation you
need. This healthcare provider also determines the dose number of treatments, and
how long you need treatment. The radiation plan depends on the treatment goal, where
the KS lesions are located, and how many will be treated.
You get radiation therapy as an outpatient in a hospital or a clinic. Outpatient means
you go to get treatment each day but go home afterward. The typical treatment for
KS is to get radiation daily for several weeks.
Before your first treatment, you might have a session to determine exactly where on
your body the radiation beam needs to be directed. The process is called simulation.
On the days you get radiation treatment, you’ll lie on a table while the machine moves
over and around you. It doesn't touch you. You may have to wear a hospital gown. The
experience is a lot like getting an X-ray, only longer. It takes about 15 to 30 minutes
to complete. But you should plan on being there for about an hour.
At the start of the treatment session, a radiation therapist may place blocks or special
shields to protect parts of your body that don’t need to be exposed to radiation.
The therapist then lines up the machine so that radiation is directed at the right
spot. When you're ready, the therapist leaves the room and starts the machine. You
may hear whirring or clicking noises, like the sounds of a vacuum cleaner, while the
radiation is given. During the session, you'll be able to talk to and be heard by
the therapist through an intercom. You can’t feel radiation, and treatment doesn't
hurt. You won't be radioactive afterward.
What to expect after radiation therapy
Radiation affects normal cells as well as cancer cells. Because of this, you may have
some side effects from this treatment. But these are usually limited to the area being
treated. Ask your healthcare provider what short-term or long-term side effects you
may have. Some people have few or no side effects. Treatment isn't usually changed
for minor side effects. But if you do have severe side effects, your healthcare provider
may change the dose of your radiation or the frequency of treatments. Or the healthcare
provider may stop treatment until the side effects are gone. In either case, be sure
you tell your healthcare provider about any side effects you have. It's important
to deal with them right away so they don't get worse.
Side effects might include:
Sometimes, treated KS lesions can become open sores, which might be painful. This
is especially true for sores in the mouth or throat.
Usually side effects go away over time after you stop getting treatment.
Working with your healthcare provider
If you have any side effects, talk with your healthcare team about how to deal with
them and how to know when they become serious. Make sure you know what number to call
with problems or questions. Is there a different number for evenings, weekends, and
holidays?
It may be helpful to keep a diary of your side effects. A written list will make it
easier to remember your questions when you go to appointments. It will also make it
easier for you to work with your healthcare team to make a plan to manage side effects.