They sometimes have severe side effects, and may further weaken your immune system, making infections more likely. In the long run, however, they can help extend your life. This is another type of cancer therapy, in which x-rays or gamma rays are used to kill cancer cells or prevent them from spreading. Radiation may be used alone, along with chemotherapy, or after surgery, when it is given to kill any cancer cells that were missed during the operation. It can reduce pain, control bleeding, and shrink cancerous tumors.
Doctors also treat cancerous lymph nodes with radiation.
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