OUTLINE: This is a dose escalation study. Patients receive endostatin IV over 1 hour daily for 28 days, followed by 1 week of rest. Patients receive subsequent courses of daily therapy in the absence of disease progression or unacceptable toxicity. Cohorts of 3 patients receive escalating doses of endostatin 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 toxicities.