| Inclusion Criteria: | 1) Patients with recurrent or refractory medulloblastoma/PNET, CNS germ cell tumors, ependymomas, AT/RT, high grade glioma and other malignant brain tumors. Brainstem gliomas are eligible if residual disease is </=1.5 cc and if the patient is off decadron.
2) Patients must have recurrent or refractory disease following at least one prior course of therapy and must have minimal residual disease as defined as </= 1.5cm^2 of enhancement. Patients with + CSF cytology, linear or fine nodular leptomeningeal disease are eligible.
3) Karnofsky Performance Status or Lansky Performance score >/= 70%
4) Anticipated life expectancy > 12 weeks to be eligible for this study
5) Adequate hematologic, renal, liver, and cardiac function as demonstrated by laboratory values within 21 days, inclusive, prior to administration of temezolomide. ANC >/= 750/mm^3; platelet count >/= 50,000/mm^3; Hgb >/=10 gm/dL (Patients may be transfused to raise the hemoglobin above 10 gm/dl), BUN and Cr <1.5 X upper limits of normal, Creatinine claearance or GFR >/= 70 cc/min/1.73 m^2. Total serum bilirubin <1.5 upper limits, SGPT <2.5 X upper limits of normal.
6) Patient must have an adequate number of autologus stem cells available, defined as a minimum of 2 x 10^6 CD34+ cells/kg and preferably at least 5 x 10^6 CD34+ cells/kg.
7) Age greater than 6 months and less than 21 years.
8) Patients must have recovered from any effects of major surgery, chemotherapy, or radiation. Patients must not have received chemotherapy (excluding nitrosureas) with in 21 days and may not have received radiation therapy therapy or nitroureas within 42 days of starting treatment.
9) Patients may have received stereotactic radiation at the time of recurrence as part of their salvage treatment.
10) Patients or legal guardians must give written informed consent. Patients between the ages of 7 and 18 must give assent, or have documentation supporting why this is not obtained. |