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DISEASE CHARACTERISTICS:

• - Histologically confirmed WHO grade 3 anaplastic (malignant) ependymoma or WHO grade 2 ependymoma, including the following variants: - Papillary.

• - Cellular.

• - Clear cell.

• - Tanycytic.

• - No myxopapillary ependymoma, subependymoma, or ependymoblastoma.

• - Meets 1 of the following criteria: - Has undergone complete resection of the primary tumor (prior to starting chemotherapy) - Two or more surgical procedures to achieve complete resection allowed.

• - Metastatic disease at diagnosis (with or without complete resection of the primary tumor) - Unable to undergo complete resection of the primary tumor (with or without metastatic disease) - Patients with measurable residual disease (primary or metastatic disease) are eligible provided they undergo treatment on clinical trial CCLG-CNS-2005-03 prior to entering this study.

• - Has undergone surgical resection OR completed treatment on clinical trial CCLG-CNS-2005-03 within the past 3 weeks.

• - Patients who are unable to tolerate chemotherapy or who do not receive treatment according to the CCLG guidelines for ependymoma due to parental preference or recommendation from the treating physician are eligible.

PATIENT CHARACTERISTICS:

• - Able to tolerate IV hydration.

• - No active infection.

PRIOR CONCURRENT THERAPY: - See Disease Characteristics

OBJECTIVES: Primary.

• - To determine the overall survival and event-free survival of all infants diagnosed with ependymoma before their third birthday.

• - To determine the overall survival and event-free survival of infants diagnosed with ependymoma before their third birthday when treated with standard chemotherapy comprising vincristine, carboplatin, high-dose methotrexate, cyclophosphamide, and cisplatin.

Secondary.

• - To investigate the reasons why the primary tumor was completely resected in patients who were able to undergo complete resection of the tumor.

• - To continue to investigate the biological characteristics of ependymoma.

• - To correlate functional imaging studies of ependymoma with biological characteristics of the tumor.

• - To provide a standard treatment regimen for patients with residual disease after optimal surgery who have already participated in a phase II study.

• - To prospectively document renal function, hearing, and neurocognitive late effects after completion of study treatment.

OUTLINE: This is a multicenter study. Patients are stratified according to extent of prior surgical resection and presence of metastatic disease (complete resection of tumor vs.#46;metastatic disease at diagnosis vs.#46;no complete resection of tumor). Patients receive vincristine IV on days 1, 15, and 29, carboplatin IV over 1 hour on day 1, high-dose methotrexate* IV over 24 hours on day 15, cyclophosphamide IV over 1 hour on day 29, and cisplatin IV over 48 hours on days 43 and 44. Treatment repeats every 8 weeks for 7 courses in the absence of disease progression or unacceptable toxicity. Patients with residual disease after completion of treatment may receive other treatment at the discretion of the investigator. NOTE: *Patients initially treated on clinical trial CCLG-CNS-2005-03 who have no residual disease do not receive high-dose methotrexate in courses 5-7. Patients undergo observational assessments comprising physical and neurological examination; MRI/ MRS scanning of the head and spine; and audiology, renal, endocrine, neurocognitive, and quality of life evaluations periodically for at least 5 years after the completion of study treatment.