Bortezomib Completed Phase 2 Trials for Recurrent Bladder Cancer / Recurrent Urethral Cancer / Stage III Bladder Cancer / Recurrent Transitional Cell Cancer of the Renal Pelvis and Ureter / Transitional Cell Carcinoma of the Bladder / Stage IV Urethral Cancer / Metastatic Transitional Cell Cancer of the Renal Pelvis and Ureter / Stage III Urethral Cancer / Metastatic Bladder Cancer / Ureteral Cancer Treatment