A Phase I Trial of High-Dose Ascorbate in Glioblastoma Multiforme

Inclusion Criteria:

* Patients must have newly diagnosed (i.e., within 5 weeks), histologically or cytologically confirmed glioblastoma multiforme.
* Diagnosis must be made by surgical biopsy or excision.
* Therapy must begin ≤ 5 weeks after surgery.
* Age ≥ 18 years
* ECOG performance status 0-2 (Karnofsky \> 50%).
* A complete blood count and differential must be obtained within 21 days prior to the first dose of radiation, with adequate bone marrow functions as defined below:

  * Absolute neutrophil count (ANC) ≥ 1500 cells per mm3
  * Platelets ≥ 100,000 per mm3
  * Hemoglobin ≥ 8 g/dL
* Serum blood chemistries within 21 days before the first day of radiation, as defined below:

  * Creatinine ≤ 2.0 mg
  * Total bilirubin ≤ 1.5 mg/dL
  * ALT (Alanine Aminotransferase)≤ 3 times the institutional upper limit of normal
  * AST (Aspartate Aminotransferase) ≤ 3 times the institutional upper limit of normal
* Tolerate one text dose (15g) of ascorbate
* Not pregnant
* Ability to understand and willingness to sign a written informed consent document

Exclusion Criteria:

* Recurrent high grade glioma
* G6PD (glucose-6-phosphate dehydrogenase) deficiency
* Patients actively receiving insulin unless approved by the study medical monitor, study sponsor, and the study principal investigator.
* History of allergic reactions attributed to compounds of similar chemical or biologic composition to temozolomide.
* Significant co-morbid central nervous system disease, including but not limited to, multiple sclerosis.
* Patients who are on the following drugs and cannot have a drug substitution: flecainide, methadone, amphetamines, quinidine, and chlorpropamide. High dose ascorbic acid may affect urine acidification and, as a result, may affect clearance rates of these drugs.
* Prior invasive malignancies (except non-melanomatous skin cancers and carcinoma in situ of the cervix or bladder) unless disease free for ≥ 5 years.
* Patients who have received prior chemotherapy (including Gliadel wafers) for the current glioma.
* Prior radiation therapy to the head or neck, which would result in overlap of radiation therapy fields.
* Patients may not be receiving any other investigational agents.
* Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.
* Pregnant women are excluded from this study because ionizing radiation is a known teratogen, and temozolomide is a Class D agent with the potential for teratogenic or abortifacient effects.
* Known HIV-positive individuals. High-dose ascorbate acid is a known CYP450 3A4 (an enzyme pathway) inducer, which results in lower serum levels of antiretroviral drugs