PATIENT CHARACTERISTICS: Age: 18 and over Performance status: ECOG 0-2 Life expectancy: At least 12 weeks Hematopoietic: Absolute granulocyte count at least 1500/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 9.0 g/dL Hepatic: Bilirubin normal AST and ALT no greater than 3 times normal (no greater than 5 times normal if liver involvement present) Albumin at least 2.5 g/dL Renal: Creatinine clearance at least 45 mL/min Other: Not pregnant or nursing Fertile patients must use effective contraception during and for 3 months after study No active infection No concurrent serious systemic disorders Body surface area no greater than 3.0 m2