PATIENT CHARACTERISTICS: Age: Adult Performance status: SWOG 0 or 1 Hematopoietic: WBC at least 3,000/mm3 Absolute neutrophil count at least 1,500/mm3 Platelet count at least 100,000/mm3 Hepatic: Bilirubin no greater than 2 times normal AST or ALT no greater than 3 times normal Renal: Creatinine no greater than 2 times normal Creatinine clearance at least 60 mL/min Magnesium normal (supplementation allowed) Other: Average hearing loss in both ears no greater than 40 dB in 50-2,000 Hz range No second malignancy within 5 years except: Adequately treated nonmelanomatous skin cancer Carcinoma in situ of the cervix Stage I/II cancer (other than head/neck) in complete remission Not pregnant or nursing Effective contraception required of fertile patients