<qa>  What is SBRT?This phase I trial studies stereotactic body radiation therapy SBRT in treating patients with prostate cancer that is likely to come back or spread high-risk undergoing surgery. SBRT is a type of external radiation therapy that uses special equipment to position a patient and precisely deliver radiation to tumors in the body. Delivering radiotherapy before prostatectomy by SBRT is more convenient, conformal, and may spare normal tissues better than delivering radiotherapy after prostatectomy. 