OUTLINE: This is a dose escalation, multicenter study. Patients receive lurtotecan liposome (NX211) IV over 30 minutes on days 1, 2, and 3. Courses are repeated every 3 weeks. Treatment continues for up to 6 courses in the absence of unacceptable toxicity or disease progression. The dose of NX211 is escalated in cohorts of 3-6 patients 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 at 4 weeks and every 3 months for 1 year.