Carboplatin, Everolimus, and Prednisone in Treating Patients With Metastatic Prostate Cancer That Progressed After Docetaxel

RATIONALE: Drugs used in chemotherapy, such as carboplatin and prednisone, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Everolimus 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 carboplatin together with everolimus and prednisone may kill more tumor cells. PURPOSE: This phase II trial is studying how well giving carboplatin together with everolimus and prednisone works in treating patients with metastatic prostate cancer that progressed after docetaxel.