Sodium Thiosulfate in Preventing Hearing Loss in Young Patients Receiving Cisplatin for Newly Diagnosed Germ Cell Tumor, Hepatoblastoma, Medulloblastoma, Neuroblastoma, Osteosarcoma, or Other Malignancy

DISEASE CHARACTERISTICS: * Newly diagnosed (previously untreated or currently receiving cancer treatment for the diagnosis that made the patient eligible for this study) with germ cell tumor, hepatoblastoma, medulloblastoma, neuroblastoma, osteosarcoma, or other malignancy * Planning to receive a chemotherapy treatment regimen that includes a cumulative cisplatin dose ≥ 200 mg/m² with individual cisplatin doses to be infused over ≤ 6 hours * Enrolled on hearing assessment clinical trial COG-ACCL05C1 * Normal auditory results PATIENT CHARACTERISTICS: * Karnofsky performance status (PS) 50-100% (for patients \> 16 years of age) * Lansky PS 50-100% (for patients ≤ 16 years of age) * Serum sodium normal * Absolute granulocyte count \> 1,000/mm³ * Platelet count \> 100,000/mm³ * Creatinine clearance or radioisotope glomerular filtration rate ≥ 70mL/min OR serum creatinine between 0.4 and 1.7 mg/dL, based on age and gender * Total bilirubin ≤ 1.5 times upper limit of normal (ULN) for age * AST or ALT \< 2.5 times ULN for age * Not pregnant or nursing * Negative pregnancy test (if patient has child-bearing capacity) * Fertile patients must use effective contraception * No known hypersensitivity to sodium thiosulfate or other thiol agents (e.g., amifostine trihydrate, N-acetylcysteine, MESNA, or captopril) PRIOR CONCURRENT THERAPY: * See Disease Characteristics * No prior platinum-based chemotherapy (cisplatin or carboplatin) * Other prior chemotherapy allowed * Prior cran…