Docetaxel and Prednisolone With or Without Zoledronic Acid and/or Strontium Chloride Sr 89 in Treating Patients With Prostate Cancer Metastatic to Bone That Has Not Responded to Hormone Therapy

RATIONALE: Drugs used in chemotherapy, such as docetaxel and prednisolone, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Zoledronic acid may help relieve some of the symptoms caused by bone metastases. Radioactive substances, such as strontium chloride Sr 89, may help relieve bone pain caused by prostate cancer. Giving docetaxel together with prednisolone with or without zoledronic acid and/or strontium chloride Sr 89 may kill more tumor cells. PURPOSE: This randomized phase II trial is studying the side effects and how well giving docetaxel together with prednisolone works with or without zoledronic acid and/or strontium chloride Sr 89 in treating patients with prostate cancer metastatic to bone that has not responded to hormone therapy.