OUTLINE: This is a randomized, open label, multicenter study. Patients are randomized to one of two treatment arms. Arm I: Patients receive nitrocamptothecin orally on days 1-5. Arm II: Patients receive fluorouracil IV over 30 minutes on day 1. Treatment repeats weekly for 8 courses in the absence of disease progression or unacceptable toxicity. Patients with tumor regression or stabilization may receive additional courses of treatment. Patients with disease progression or unacceptable toxicity may crossover to the alternate treatment arm. Patients are followed every 3 months for one year.