OUTLINE: Patients receive a 120 hour continuous infusion of aminocamptothecin colloidal dispersion (AC/CD) once a week for 2 weeks, followed by 1 week of rest. Patients are assessed after every 2 courses of therapy. Treatment with aminocamptothecin continues indefinitely if there is tumor shrinkage or stable disease and no significant toxicity is experienced. Patients are followed every 3 months.