PATIENT CHARACTERISTICS: Age: 18 to 70 Menopausal status: Not specified Performance Status: ECOG 0-2 Life expectancy: At least 16 weeks Hematopoietic: Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: SGOT or SGPT no greater than 2.5 times upper limit of normal Renal: Creatinine no greater than 2 mg/dL Other: HIV negative Not pregnant or nursing Negative pregnancy test Fertile patients must use effective contraception No underlying medical or psychiatric conditions No concurrent active infection No prior malignancies except nonmelanoma skin cancer