OUTLINE: This is a randomized, open label, multicenter study. Patients are randomized to receive glufosfamide with or without hydration. Arm I: Patients receive glufosfamide IV over 1 hour every 3 weeks. Arm II: Patients receive glufosfamide as in arm I. Patients are hydrated with excess physiological saline solution 4 hours before and 3 hours after treatment with glufosfamide. Treatment in both arms continues for 2-6 courses in the absence of unacceptable toxicity or disease progression. Patients with an objective complete response continue treatment for a maximum of 2 courses after the confirmation of response. Patients are followed every 6 weeks until disease progression.