PATIENT CHARACTERISTICS: Age: Not specified Performance status: Not specified Life expectancy: Not specified Hematopoietic: WBC greater than 1,500/mm3 Platelet count greater than 100,000/mm3 No chronic hematologic disorder No coagulation disorder Hepatic: Not specified Renal: Creatinine less than 1.36 mg/dL Other: No significant medical condition that would preclude study