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

This phase II trial is studying how well giving gemcitabine, paclitaxel, and doxorubicin together with pegfilgrastim works in treating patients with metastatic or unresectable bladder cancer or urinary tract cancer and kidney dysfunction. Drugs used in chemotherapy, such as gemcitabine, paclitaxel, and doxorubicin, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Colony stimulating factors, such as pegfilgrastim, may increase the number of immune cells found in bone marrow or peripheral blood and may help the immune system recover from the side effects of chemotherapy. Giving combination chemotherapy together with pegfilgrastim may kill more tumor cells. Chemotherapy drugs may have different effects in patients who have changes in their kidney function.