Androgen Suppression Plus Radiation Therapy in Treating Patients With Prostate Cancer

RATIONALE: Androgens can cause the growth of prostate cancer cells. Drugs, such as leuprolide, goserelin, flutamide, or bicalutamide, may stop the adrenal glands from making androgens. Radiation therapy uses high-energy x-rays to damage tumor cells. Giving these drugs together with radiation therapy may kill more tumor cells. PURPOSE: This phase II trial is studying how well androgen suppression with either leuprolide or goserelin and either flutamide or bicalutamide together with radiation therapy works in treating patients with prostate cancer.