OUTLINE: This is a dose escalation study of SU5416. Patients receive cisplatin IV over 90 minutes immediately followed by irinotecan IV over 90 minutes and SU5416 IV over 2 hours on day 1. Patients receive SU5416 alone on day 4. Patients receive combination chemotherapy weekly for 4 weeks and SU5416 twice weekly for 6 weeks. Courses repeat every 6 weeks in the absence of disease progression or unacceptable toxicity. Cohorts of 3-6 patients receive escalating doses of SU5416 until the maximum tolerated dose (MTD) is reached. The MTD is defined as the dose preceding that at which 2 of 6 patients experience dose limiting toxicity.