RecruitingRadiation therapyHigh-dose Brachytherapy Boost With Stereostatic Body Radiation Therapy to Intermediate or Higher Risk Prostate CancerThe objective of this phase I/II trial is to prospectively evaluate the toxicity and therapeutic efficacy of Stereostatic Body Radiation Therapy (SBRT) to prostate and pelvic lymph nodes in combination with high-dose-rate (HDR) brachytherapy to the prostate in patients with localized unfavorable-intermediate risk or higher disease.