High Dose Rate (HDR) brachytherapy is the most accurate and precise way of treating prostate cancer with radiation. Because HDR brachytherapy is delivered rapidly, patients recover more quickly and are able to return to normal living sooner. Using advanced imaging, BC Cancer experts are able to determine the exact location of the cancer within the prostate and deliver a higher dose of radiation to the site that needs it most. The HDR brachytherapy program, which began in 2011, has recently expanded to include men with earlier-stage, less aggressive cancers who may not have not been eligible for this treatment until now. We are comparing the current standard—a permanent Low Dose Rate seed implant—to HDR. These men are also eligible for genetic testing to determine the aggressiveness of the cancer and help to predict the response to brachytherapy and/or need for additional treatment.