Radiation Therapy, Androgen Suppression, and Docetaxel in Treating Patients With High-Risk Prostate Cancer Who Have Undergone Radical Prostatectomy

RATIONALE: Specialized radiation therapy that delivers a high-dose of radiation directly to the tumor may kill more tumor cells and cause less damage to normal tissue. Androgens can cause the growth of prostate cancer cells. Antihormone therapy, such as leuprolide, goserelin, flutamide, or bicalutamide, may lessen the amount of androgens made by the body. Drugs used in chemotherapy, such as docetaxel, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Giving radiation therapy together with androgen suppression and docetaxel after surgery may kill any tumor cells that remain after surgery. PURPOSE: This phase II trial is studying how well giving radiation therapy together with androgen suppression and docetaxel works in treating patients with high risk prostate cancer who have undergone radical prostatectomy.