Trial to Evaluate Radiotherapy Followed by Endocrine Therapy Vs Endocrine Therapy Alone for PSA Failure After Radical Prostatectomy

Inclusion Criteria: * A diagnosis of localized prostate cancer (clinical stage T1-2N0M0) which is treated by radical prostatectomy * Pathological stage: pT0/2/3 and pN0/x * Serum level of PSA once reached \< 0.1 ng/ml after radical prostatectomy and then increased 0.4 ng/ml * Serum level of PSA 1.0 ng/ml at entry * No clinical recurrence based on abdominal and pelvic computed tomography, and a bone scan * No history of chemotherapy or radiation therapy or endocrine therapy for any cancer * Ages 20 to 79 years * Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 * No blood transfusion within 28 days of entry * Sufficient organ function within 28 days of entry * Provided written informed consent Exclusion Criteria: * Synchronous or metachronous (within 5 years) malignancy other than carcinoma in situ * Mental disease or mental symptoms which would affect participant's decision to participate * Continuous medication with steroids (exclude external use of steroids for skin) * Ischemic heart disease or arrhythmia which needs medical treatment * Poorly controlled hypertension * Poorly controlled diabetes mellitus * History of cerebral infarction or myocardial infarction within 6 months * Liver cirrhosis * Interstitial pneumonia which requires ventilation assistance, oxygen inhalation, steroids, or diuretic medicine