OUTLINE: This is an open label, dose escalation study. Patients receive combretastatin A4 phosphate IV over 10-60 minutes. Treatment repeats every 3 weeks in the absence of unacceptable toxicity or disease progression. Cohorts of 3-6 patients receive escalating doses of combretastatin A4 phosphate until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 3 or 2 of 6 patients experience dose limiting toxicity. Patients are followed at 3 weeks.