Proton Beam Radiation Therapy for Early Stage Adenocarcinoma of the Prostate

Inclusion Criteria: * Patients with previously treated adenocarcinoma of the stages T1c-T2b and Gleason of equal to or greater than 5. * PSA values of equal to or less than 15 ng/ml must be demonstrated within two months prior to study entry and greater than 3 weeks after prostate biopsy. * Zubrod status 0-1. * No evidence of distant metastasis. * No evidence of other cancer. Prior malignancy does not exclude the patient if disease free for greater than five years. Exclusion Criteria: * Clinical stages T2c or above. * PSA greater than 15. * Any patient with T1c disease, a PSA less than or equal to 4 and Gleason sum less than 6. * Evidence of lymph node involvement if lymph node sampling performed. * Previous prostate surgery to include: simple prostatectomy, TURP, hyperthermia and cryosurgery. * Previous prostate radiation. * Prior hormonal therapy. * History of inflammatory bowel disease even if currently inactive or controlled on medication. * Prior systemic chemotherapy. * History of proximal urethral stricture requiring dilatation. * Current and continuing anticoagulation with Coumadin or equivalent. * Major medical or psychiatric illness