Docetaxel and Imatinib Mesylate in Treating Patients With Androgen-Independent Prostate Cancer and Bone Metastases That Progressed on the Docetaxel and Placebo Group of MDA-ID-030008

RATIONALE: Drugs used in chemotherapy such as docetaxel work in different ways to stop tumor cells from dividing so they stop growing or die. Imatinib mesylate may stop the growth of tumor cells by blocking the enzymes necessary for their growth. Giving docetaxel with imatinib mesylate may kill more tumor cells. PURPOSE: This phase II trial is studying how well giving docetaxel with imatinib mesylate works in treating patients with androgen-independent prostate cancer and bone metastases that progressed while receiving docetaxel and a placebo on clinical trial MDA-ID-030008.