Sorafenib Terminated Phase 2 Trials for Distal Urethral Cancer / Recurrent Bladder Cancer / Recurrent Urethral Cancer / Recurrent Transitional Cell Cancer of the Renal Pelvis and Ureter / Stage III Bladder Cancer / Squamous Cell Carcinoma of the Bladder / Transitional Cell Carcinoma of the Bladder / Urethral Cancer Associated With Invasive Bladder Cancer / Metastatic Transitional Cell Cancer of the Renal Pelvis and Ureter / Regional Transitional Cell Cancer of the Renal Pelvis and Ureter / Adenocarcinoma of the Bladder / Proximal Urethral Cancer / Metastatic Bladder Cancer Treatment