Prostate specific antigen (PSA) and testosterone levels will be checked before therapy begins. These blood tests will require about 1 teaspoon of blood. They will be checked before radiation therapy begins, but will not be checked during your radiation treatment. Your PSA and testosterone levels will be rechecked at 3 to 6 month intervals after the radiation therapy is done for the first 2 years. PSA will be checked every 6 months for the Years 3 and 4, and once a year for Year 5.