Chemotherapy, Hormone Therapy, and Radiation Therapy in Treating Patients With Locally Advanced Prostate Cancer

RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Androgens can stimulate the growth of prostate cancer cells. Drugs such as goserelin or leuprolide may stop the adrenal glands from producing androgens. Radiation therapy uses high-energy x-rays to damage tumor cells. Combining chemotherapy, hormone therapy, and radiation therapy may kill more tumor cells. PURPOSE: This phase II trial is studying giving chemotherapy together with hormone therapy and radiation therapy in treating patients with locally advanced prostate cancer.