Valproic Acid and Radiation Followed by Maintenance Valproic Acid and Bevacizumab in Children With High Grade Gliomas or Diffuse Intrinsic Pontine Glioma
Valproic Acid and Radiation Followed by Maintenance Valproic Acid and Bevacizumab in Children With High Grade Gliomas or Diffuse Intrinsic Pontine Glioma
Currently, there are few effective treatments for the following aggressive brain tumors:
 glioblastoma multiforme, anaplastic astrocytoma, gliomatosis cerebri, gliosarcoma, or
 brainstem glioma. Surgery and radiation can generally slow down these aggressive brain
 tumors, but in the majority of patients, these tumors will start growing again in 6-12
 months. Adding chemotherapy drugs to surgery and radiation does not clearly improve the cure
 rate of children with malignant gliomas.

 The investigators are conducting this study to see if the combination of valproic acid and
 bevacizumab (also known as AvastinTM) with surgery and radiation will shrink these brain
 tumors more effectively and improve the chance of cure.
With the exception of patients with brainstem gliomas, all patients should have the maximal
 surgical resection that can be safely performed prior to study entry. Submission of frozen
 tumor is strongly encouraged. After recovery from neurosurgery, all patients will start
 valproic acid and radiation therapy.

 Valproic Acid (VPA): VPA will be started at 15 mg/kg/day divided into three doses a day,
 ideally 48 hours prior to first day of radiation therapy, but no later than the first day of
 radiation therapy. Patients may also begin VPA sooner if they have post-operative seizures
 and require an anti-convulsant.

 Radiation Phase: Radiation therapy should begin within 30 days of definitive surgery or
 radiographic diagnosis, whichever is the later date. Date of surgery or radiographic
 diagnosis is considered day 1, and radiation should start no later than day 31. VPA will be
 continued daily without interruption during radiation therapy. VPA doses will be adjusted in
 increments of 5 mg/kg/day every 3-5 days to achieve and maintain trough concentrations
 between 85 to 115 mcg/ml. During this time patients will receive standard radiation therapy.

 Post Radiation Phase: Patients will continue to receive VPA as during radiation. If
 necessary, patients who had delays in radiation (e.g., secondary to schedule holidays or the
 need to have a new mask made) will complete their radiotherapy to the total prescribed
 protocol dose.

 Maintenance Phase: Maintenance therapy will begin 4 weeks after completion of radiation or
 week 11, whichever comes first.

 Patients will continue VPA daily during maintenance therapy. All patients will start
 bevacizumab, 10 mg/kg by vein every two weeks, at the start of maintenance therapy.
 Maintenance therapy will continue uninterrupted if all laboratory tests continue to meet
 on-study criteria. In the absence of unacceptable toxicity or disease progression, patients
 will continue to receive protocol treatment for a maximum total duration of two years
 (including the radiation phase).
Inclusion Criteria:

 1. Patient must be greater than or equal to 3 years and less than or equal to 21 years of
 age at the time of study enrollment.

 2. Patients must have histologic verifications of a glioblastoma multiforme, anaplastic
 astrocytoma, gliomatosis cerebri (WHO grade III or IV glioma with diffuse parenchymal
 and/or leptomeningeal involvement), or gliosarcoma at the time of study enrollment.
 Patients with newly diagnosed intrinsic brainstem gliomas, defined as tumors with a
 pontine epicenter and diffuse rather than focal involvement of th pons, with or
 without extension to adjacent medulla or midbrain, are eligible without histologic
 confirmation. Patients with brainstem tumors that do not meet these criteria or not
 considered to be typical intrinsic pontine gliomas will only be eligible if the tumors
 are biopsied and proven to be a grade III or IV glioma (anaplastic astrocytoma,
 glioblastoma multiforme, gliosarcoma).

 3. Patients must have Karnofsky Performance Score (for patients greater than 16 years of
 age) or Lansky Performance Score (for patients less than or equal to 16 years of age)
 greater than or equal to 50% assessed within two weeks of study enrollment. Patients
 who are unable to walk because of paralysis, but who are up in a wheelchair, will be
 considered ambulatory for the purpose of assessing the performance score.

 4. Patients must not have received any prior chemotherapy, radiation therapy, biologic
 therapy, or bone marrow transplant. Surgery and dexamethasone are permitted prior to
 study entry. In patients who require anti-convulsant prior to study entry, it is
 permissible to start VPA, but trough VPA concentration must be repeated within 48
 hours of study entry.

 5. Patients must have adequate bone marrow function defined as: - Hgb greater than or
 equal to 8 gm/dL (transfusion independent) - Platelet count greater than or equal to
 100,000/mm3 (transfusion independent) - Absolute neutrophil count (ANC) greater than
 or equal to 1,000/ mm3

 6. Patients must have adequate liver function defined as:

 -  Bilirubin (sum of conjugated + unconjugated) less than or equal to 1.5 times
 institutional upper limit of normal (ULN) for age.

 -  SGPT (ALT) less than or equal to 2.5 times institutional ULN for age.

 -  Serum albumin greater than or equal to 2 g/dL.

 7. Patients must have adequate renal function defined as:

 -  Urine protein (albumin)/creatinine ratio of less than 1.0

 -  Creatinine clearance or radioisotope GFR greater than or equal to 70
 ml/min/1.73m2 OR

 -  A serum creatinine based on age and gender as follows:

 -  2 to less than 6 years of age: 0.8 mg/dL for male and female

 -  6 to less than 10 year of age: 1.0 mg/dL for male and female

 -  10 to less than 13 years of age: 1.2 mg/dL for male and female

 -  13 to less than 16 years of age: 1.5 mg/dL for males and 1.4 for females

 -  Greater than or equal to 16 years of age: 1.7 mg/dL for males and 1.4 mg/dL
 for females

 Note: The threshold creatinine values in this table were derived from the Schwartz
 formula for estimating GFR (Schwartz et al. J. Peds, 106:522, 1985) utilizing child
 length and stature data published by the CDC.

 8. Amylase and lipase less than or equal to 2 times institutional ULN for age.

 9. Patients must not have a prolonged PT or PTT (greater than 1.2 times the institutional
 upper limit of normal), and the INR must be less than 1.5.

 10. MRI ECHO gradient sequences are required to evaluate for the presence or absence of
 CNS hemorrhage. Patients with intra-tumoral and/or CNS hemorrhage are eligible for
 study entry if they fulfill the following guidelines:

 -  Patients with an asymptomatic intra-tumoral/intracranial hemorrhage measuring
 less than 1 cm in the widest dimension on MRI at the time of diagnosis, after
 surgery, and/or any time prior to study enrollment, are eligible; hemorrhage must
 not have progressed on MRI prior to initiation of protocol therapy; patients mut
 not have developed progressive symptoms thought to be related to the
 intra-tumoral/intracranial hemorrhage prior to initiation of protocol therapy.

 -  Patients with a greater than 1 asymptomatic intra-tumoral/intracranial hemorrhage
 but all measuring less than 1 cm in the widest dimension on MRI are eligible if
 they fulfill the guidelines described above.

 -  Patients with asymptomatic post-operative hemorrhage in and/or around the
 surgical cavity are eligible for study entry if they otherwise fulfill the
 guidelines described above.

 -  Patients with an intra-tumoral hemorrhage greater than 1 cm at diagnosis but who
 demonstrate minimal post-operative hemorrhage as described above after tumor
 resection are eligible for study.

 11. Patients must begin radiation therapy within 30 days of surgery or radiographic
 diagnosis, whichever is the later date.

 12. All patients and/or their legal guardians must sign a written informed consent.
 Assent, when appropriate, will be obtained according to institutional guidelines.

 Exclusion Criteria:

 1. Females of reproductive potential must not be pregnant or lactating. Males or females
 of reproductive potential may not participate unless they have agreed to use an
 effective contraceptive method.

 2. Patients with active or history of cardiac (CHF, myocardial infarction, myocarditis)
 disease are excluded from this trial.

 3. Patients receiving any of the following medications are not eligible for study entry:
 a. Anti-cancer therapy or investigational agents b.Anti-coagulants (except for heparin
 to maintain the patency of central venous catheters). c.Growth factors for white blood
 cell, red blood cell or platelet support d.Aspirin (> 81 mg/day) e.Non-steroidal
 anti-inflammatory drugs f.Clopidogrel (Plavix), Dypiramidole (Persantine), or any
 other drug that inhibits platelet function g. Anti-convulsants: patients on any
 anti-convulsant with the exception of VPA are eligible for study entry. It is strongly
 recommended that a neurology consult be obtained to enable discontinuation of all
 anti-convulsant other than VPA, whenever possible.

 4. Patients who have an uncontrolled infection are not eligible.

 5. Patients with inadequately controlled systemic hypertension (SBP and/or DBP greater
 than 95th percentile for age and height)

 6. Patients with a prior history of hypertensive crisis and/or hypertensive
 encephalopathy

 If a BP measurement prior to registration is greater than 95th percentile for age and
 height, it must be rechecked and documented to be less than 95th percentile for age
 and height prior to registration. If a patient falls between the height or weight
 percentiles, site should average the value as appropriate. For patients greater than
 or equal to 18 years, use adult normal ranges for blood pressure. Patients with
 hypertension are eligible if their blood pressures become less than 95th percentile
 after anti hypertensive medications.

 7. Prior Ischemic Events: Patients with a history of stroke, myocardial infarction, or
 unstable angina within 6 months prior to registration are not eligible.

 8. Vascular Disease: Patients with significant vascular disease (e.g., aortic aneurysm
 requiring surgical repair or recent peripheral arterial thrombosis) within 6 months
 prior to registration will not be eligible.

 9. Patients with a history of hemoptysis, bleeding diathesis, known platelet disorder, or
 coagulopathy are not eligible.

 10. Patients with a history of abdominal fistula or GI perforation within 6 months prior
 to registration are not eligible.

 11. Patients with a known or suspected urea cycle or other metabolic disorder are not
 eligible.

 12. Patients with abnormality of the tibial metaphyseal plate on plain X-ray prior to
 study entry are not eligible.

 13. Patients with a history of a serious non-healing wound, ulcer, or bone fracture are
 not eligible.

 14. Patients with any clinically significant systemic illness, including serious
 infection, pulmonary, hepatic, or other organ impairment, that would compromise
 tolerance and/or timely completion of protocol therapy.

 16. Patients who, in the opinion of the investigator, may not be able to comply with the
 safety monitoring requirements and/or follow-up studies of this trial.

 17. Patients with a known hypersensitivity to any component of bevacizumab are not eligible
 for this trial.