OUTLINE: This is a dose escalation study. Patients receive MEN-10755 IV over 15 minutes on days 1, 8, and 15. Treatment continues every 4 weeks, or upon recovery of toxicity, whichever comes later. Treatment continues for at least 2 courses in the absence of unacceptable toxicity or disease progression. Cohorts of 3-6 patients receive escalating doses of MEN-10755 until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 6 patients experience dose limiting toxicity. Patients are followed for at least 3 weeks.