Docetaxel and Prednisone With or Without Cediranib in Treating Patients With Metastatic Prostate Cancer That Did Not Respond to Hormone Therapy

This randomized phase II trial is studying how well giving docetaxel and prednisone together with or without cediranib works in treating patients with metastatic prostate cancer that did not respond to hormone therapy. Drugs used in chemotherapy, such as docetaxel and prednisone, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Cediranib may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth and by blocking blood flow to the tumor. Giving docetaxel together with prednisone, with or without cediranib, may kill more tumor cells.