OUTLINE: This is a dose-escalation study of doxorubicin. Patients receive suramin IV daily over 1-2 hours on days 1-4 followed by doxorubicin IV over 10-15 minutes on day 5. Treatment repeats every 4 weeks for up to 3 courses in the absence of unacceptable toxicity, disease progression, or clinical deterioration. Starting from course 4, patients receive alternating courses of doxorubicin IV on day 1 every 4 weeks (courses 4, 6, 8, etc.) and suramin with doxorubicin (courses 5, 7, 9 etc.) as described above. Cohorts of 3-6 patients receive escalating doses of doxorubicin until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 or more of 6 patients experience dose-limiting toxicity. Stable patients who achieve disease response and are able to receive a target cumulative dose of doxorubicin may discontinue doxorubicin and receive suramin alone every 8 weeks. Patients are followed at 3 months.