OUTLINE: Patients are stratified according to disease (measurable vs nonmeasurable). (The measurable disease stratum closed to accrual effective 08/1998.) Patients receive aminocamptothecin IV continuously on days 1-3. Courses repeat every 2 weeks in the absence of disease progression or unacceptable toxicity. Patients who achieve complete response (CR) receive 4 additional courses past CR. Patients are followed every 3 months for 2 years, every 6 months for 3 years, and then annually thereafter.