The ultimate goal of radiation therapy is to destroy a spinal tumor. Radiation is also used to shrink a tumor before or after spine surgery and to relieve tumor-related pain.
Before radiation therapy is recommended, many things are considered, such as the type of tumor, neurologic deficit, spinal deformity, and bone or spinal cord involvement. The doctor will also consider you general health, symptoms, and life expectancy. A careful and thoughtful assessment is important because there are many types of radiation and delivery methods. Planning is essential to a good radiation therapy outcome.
Sometimes radiation therapy is combined with a radiosensitizer. A radiosensitizer is a drug that makes cancer cells hypersensitive to radiation's effects.
Types of Radiation Therapy
Just as there are many types of spinal tumors, there are many radiation therapies. Your doctor will discuss which one(s), if any, are appropriate for your treatment plan.
Combining Drugs with Radiation
As mentioned earlier, radiosensitizers are drugs that can help make cancer cells more receptive to the goals of radiation. Sometimes these drugs are called hypoxic radiosensitizers. Basically, these drugs reduce the amount of oxygen (hypoxicity) cancer cells can absorb. Since oxygen is essential to cell repair, hypoxicity contributes to cancer cell death.
To protect non-cancerous cells from radiation's harmful effects, radioprotector drugs may be administered. Currently, the only drug approved by the US Food and Drug Administration (FDA) is amifostine (brand name Ethyol). It is administered intravenously to prevent dry mouth and protect the saliva-producing glands in patients with neck cancer.
Currently, existing drugs are under investigation for other applications in radiation therapy. New drug research is also being conducted.
Details about Radiation Therapy
Simulation is the term used to describe where beams of radiation will be aimed. The radiation therapist uses x-ray or CT to determine the exact target spot(s). Radiation target spots are marked—with a marking pen on your body.
Because you must lie very still during radiation therapy, a body mold may be constructed to keep you comfortably immobile. Such body molds are usually made from foam or plastic. If necessary, radiation shields are built into the body mold to protect organs and tissues.
Side Effects of Radiation Therapy
Most radiation therapy patients experience side effects. Ask your doctor or radiologist about the side effects you may experience. Some common side effects include:
Your doctor can recommend over-the-counter or prescription medication to help you manage the side effects of radiation therapy.