Radiation oncologist Dr. Julian Hong explains how radiation therapy works and its central role in treating prostate cancer, both when the disease is localized and when it has spread to limited areas. He outlines major radiation options, including external beam radiation, stereotactic body radiation therapy (SBRT), and brachytherapy, and describes how treatment plans are carefully tailored using imaging, planning scans, and computer modeling to maximize precision and minimize side effects. Hong highlights advances in targeting and beam modulation, which allow for safer, more effective treatment. He also discusses typical timelines for treatment, short- and long-term side effects, and the importance of ongoing follow-up to manage late effects of therapy. Series: "Prostate Cancer Patient Conference" [Health and Medicine] [Show ID: 40803]