A Study Evaluating Chemotherapy With Fractionated Cisplatin/Gemcitabine Versus Carboplatin/Gemcitabine in the Treatment of Advanced or Metastatic Urothelial Cancer With Impaired Renal Function.

This is a phase II/III, multicenter, randomized study which includes 420 patients on six years + 3 years follow up. 92 patients will be included during the phase II ; additional 328 patients will be included. Patients with an advanced or metastatic urothelial cancer with impaired renal function will be randomized in one of the two following chemotherapy arm: * Fractionated Cisplatin + Gemcitabine. * Carboplatin + Gemcitabine. The main objective of the part II study will be to evaluate the efficacy and the safety of a chemotherapy with a doublet platinum salt compound/Gemcitabine with fractionated Cisplatin or Carboplatin in this population. The main objective of the part III study will be to compare the efficacy in terms of overall survival of a chemotherapy with a doublet platinum salt/Gemcitabine with fractionated Cisplatin or Carboplatin in this population.