Gemcitabine, Paclitaxel, Doxorubicin in Metastatic or Unresectable Bladder Cancer With Decreased Kidney Function

distal urethral cancer, metastatic transitional cell cancer of the renal pelvis and ureter, proximal urethral cancer, recurrent bladder cancer, recurrent transitional cell cancer of the renal pelvis and ureter, recurrent urethral cancer, regional transitional cell cancer of the renal pelvis and ureter, stage iii bladder cancer, stage iv bladder cancer, transitional cell carcinoma of the bladder, urethral cancer associated with invasive bladder cancer, interventional