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Testing a New Anti-Cancer Drug, 131I-Omburtamab, in Recurrent Medulloblastoma or Ependymoma

Trial Status: closed to accrual and intervention

This phase II trial studies the effect of 131I-omburtamab compared to usual chemotherapy in treating patients with medulloblastoma that has come back (recurrent) (Stratum 1), and the effect of 131I-omburtamab in treating patients with recurrent ependymoma (Stratum 2). Patients in both strata receive 131I-omburtamab, a monoclonal antibody called 8H9 linked to a radioactive agent called iodine 131. 8H9 attaches to B7H3 positive tumor cells in a targeted way and delivers iodine 131 to kill them. Patients in Stratum 1 receive the usual chemotherapy drugs, temozolomide and irinotecan, that work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing, or by stopping them from spreading. Patients in Stratum 1 also receive the usual drug bevacizumab, which may stop or slow tumor cells by blocking the growth of new blood vessels necessary for tumor growth. Adding a new drug called 131I-omburtamab to the usual chemotherapy may lower the chance of recurrent medulloblastoma growing or spreading (Stratum 1). Giving 131I-omburtamab may also be used safely to treat patients with recurrent ependymoma (Stratum 2).