Patients receive aminocamptothecin IV continuously on days 1-3. Treatment repeats every 2 weeks for a minimum of 3 courses in the absence of disease progression or unacceptable toxicity. Patients who achieve stable disease, partial response (PR), or complete response (CR) may receive 2 additional courses past best response (minimum of 6 courses if PR or CR). Patients are followed every 6 months for 2 years, and then annually thereafter.