Other outcomes include acute and late GU/bladder and acute GI/rectum toxicity as well as patient-assessed quality of life (Prostate Cancer Index). The percentage of patients requiring IMRT treatment will be determined. The changes in rectal mucosa will be assessed by endoscopy for a subset of patients who agree to undergo sigmoidoscopy at baseline, 18 months and then 36 months after radiotherapy. Tumor control will be determined as PSA relapse free survival, using the ASTRO consensus definition for PSA failure.