- Investigate the toxicity of and response rate to a new dose intensive induction chemotherapy regimen (regimen C: vincristine, carboplatin, and temozolomide) in children under ten years of age who are newly diagnosed with either high grade gliomas or diffuse intrinsic pontine tumors. (Regimen B closed to accrual effective 3/30/2000; regimen C open to accrual effective 7/21/2000)