The purpose of this study is to compare the effects, good and/or bad of two treatment methods on subjects and their cancer.
Proton beam radiation therapy is one of the treatments for men with prostate cancer who have localized disease. The benefit of the combination with androgen suppression is not completely understood. This study will compare the use of hypofraction proton therapy (28 treatments) alone to proton therapy with androgen suppression therapy.
Histologically confirmed prostate adenocarcinoma (within 365 days of randomization) at intermediate risk for reoccurrence determined by at least one of the following: Gleason Score 7, PSA > = 10 and < = 20, T stage T2b - T2c
Clinical stages T1-T2c N0 M0 as staged by the treating investigator. (AJCC Criteria 7th Ed.- appendix III).
Histological evaluation of prostate biopsy with assignment of a Gleason score to the biopsy material; Gleason score must be in the range of 2-7. > 6 cores are strongly recommended.
PSA values < = 20 ng/ml within 90 days prior to randomization. Obtained prior to biopsy or at least 21 days after prostate biopsy.
Pelvic lymph nodes > 1.5 cm in greatest dimension unless the enlarged lymph node is biopsied and negative.
Previous prostate cancer surgery to include: prostatectomy, hyperthermia and cryosurgery.
Previous pelvic radiation for prostate cancer.
Previous androgen suppression therapy for prostate cancer.