Radiation therapy uses focused high-energy x-rays that penetrate the tissues of the body to reach and destroy cancerous cells. Radiation may be used to treat areas of bone damaged by myeloma that have not responded to chemotherapy and are causing pain. It is also the most common treatment for solitary plasmacytomas.

If myeloma severely weakens the vertebral (back) bones, these bones can collapse and put pressure on the spinal cord and spinal nerves. Symptoms include a sudden change in sensation (such as numbness or tingling), sudden weakness of leg muscles, or sudden problems with urination or moving the bowels.. This is a medical emergency -- patients with these symptoms should call their doctor right away. Prompt treatment, with radiation therapy and/or surgery, is often needed to prevent paralysis.

The type of radiation therapy most often used to treat multiple myeloma or solitary plasmacytoma is called external beam radiation therapy. For this type, the radiation is aimed at the cancer from a machine outside the body. Having radiation therapy is much like having a diagnostic x-ray except that each treatment lasts longer, and the course of treatment may continue for several weeks.

Last Medical Review: 02/13/2009
Last Revised: 05/12/2009