OUTLINE: This is a multicenter study. Patients undergo a local transurethral resection. Patients then receive methotrexate IV on day 1, followed by vinblastine IV, doxorubicin IV, and cisplatin IV on day 2. Filgrastim (G-CSF) is administered on days 4-10. Chemotherapy is repeated every 14 days for 3 courses. After the end of chemotherapy, patients undergo another local transurethral resection in order to define response to treatment. Patients with minimal or no disease are treated with radiotherapy. Patients who still have disease undergo a cystectomy. Patients are followed every 3 months for the first 2 years, and then every 6 months until death.