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External-beam radiation therapy is an excellent treatment option for many men with prostate cancer. First and foremost, it requires no surgery—this is a key advantage for older men, as well as for men with other health problems that might preclude major surgery. Also, it can be used in men with prostate tumors that are too far advanced to be cured by surgery.

There are two standard approaches to radiation treatment for prostate cancer—sending radiation into the tumor from the outside, with external-beam radiation therapy, and implanting radioactive seeds directly into the tumor; this is called interstitial brachytherapy.

Currently, the “gold standard” for radiation is external-beam radiation therapy. Sophisticated refinements have transformed it from the imprecise, mostly palliative treatment it was just decades ago into a powerful treatment that can cure localized cancer—not just relieve the symptoms of advanced disease.

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