OUTLINE: This is a dose escalation, multicenter study of irinotecan. Patients receive docetaxel IV over 1 hour followed immediately by irinotecan IV over 30 minutes on days 1, 8, 15, and 22. Treatment continues every 6 weeks in the absence of disease progression or unacceptable toxicity. Cohorts of 3-6 patients receive escalating doses of irinotecan until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 2 of 6 patients experience dose limiting toxicity. Patients are followed every 3 months for 1 year, then every 6 months thereafter.