RadiotherapyTreatment that uses ionizing radiation to kill cancer cells.... Full Definition uses radioactive material to kill cancerCancer is a group of diseases where cells grow abnormally an... Full Definition cells. It has been an effective part of cancer treatment for many years. For prostateThe prostate is a walnut-sized gland located between the bla... Full Definition cancer, there are both internal and external radiationHigh-energy particles that cause ionization and tissue damag... Full Definition options. New forms are more precise and carry fewer side effects, extending the range of treatment options for men at all stages of cancer.