OUTLINE: This is a dose escalation study. Patients receive continuous infusions of L-778,123 over 7 days every 3 weeks. Treatment continues in the absence of disease progression or unacceptable toxic effects. All patients are observed for at least 1 week after the 7 day infusion of L-778,123 prior to subsequent dose escalation. Cohorts of 3-6 patients receive escalating doses of L-778,123 until the maximum tolerated dose (MTD) is reached. MTD is defined as the dose at which no more than 2 of 6 patients experiences dose limiting toxicities. Patients are followed until death.