Vorinostat, Temozolomide, or Bevacizumab in Combination With Radiation Therapy Followed by Bevacizumab and Temozolomide in Young Patients With Newly Diagnosed High-Grade Glioma

This randomized phase II/III trial is studying vorinostat, temozolomide, or bevacizumab to see how well they work compared with each other when given together with radiation therapy followed by bevacizumab and temozolomide in treating young patients with newly diagnosed high-grade glioma. Vorinostat may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Drugs used in chemotherapy, such as temozolomide, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Monoclonal antibodies, such as bevacizumab, can block tumor growth in different ways. Some block the ability of tumor cells to grow and spread. Others find tumor cells and help kill them or carry tumor-killing substances to them. Radiation therapy uses high-energy x-rays to kill tumor cells. It is not yet known whether giving vorinostat is more effective then temozolomide or bevacizumab when given together with radiation therapy in treating glioma.

PRIMARY OBJECTIVES:

1. To identify the dose of vorinostat that is feasible when given in combination with radiotherapy (RT) in patients with newly diagnosed high-grade gliomas (HGG). II. To compare 1-year event-free survival of patients with newly diagnosed HGG treated with vorinostat (using MTD) versus bevacizumab versus temozolomide when given in combination with RT followed by maintenance therapy with bevacizumab and temozolomide. (Phase II) III. To compare the event-free survival of patients with newly diagnosed HGG treated with the superior chemoradiotherapy (from phase II portion) versus temozolomide given in combination with RT followed by maintenance chemotherapy with bevacizumab and temozolomide. (Phase III)

SECONDARY OBJECTIVES:

1. To evaluate the anti-tumor activity, as measured by event-free survival (EFS), progression-free survival (PFS), and overall survival (OS), of patients with newly diagnosed HGG treated with vorinostat, bevacizumab, or temozolomide when given in combination with RT followed by maintenance chemotherapy with bevacizumab and temozolomide. II. To define and evaluate the toxicities of each of the treatment arms of the study.

III. To conduct gene expression profiling and SNP arrays in patients with newly diagnosed HGG.

IV. To assess telomerase activity, hTert expression, and telomere length in patients with newly diagnosed HGG. V. To document changes in perfusion and diffusion using MR imaging at baseline, prior to, during (prior to course 3), and after maintenance therapy with bevacizumab and temozolomide.

VI. To correlate functional changes in tumor with responses to bevacizumab treatment using MR diffusion/perfusion imaging. VII. To correlate the results of the bevacizumab biology studies in serum or tumor with EFS.

VIII. To explore the prognostic significance of MGMT status for patients newly diagnosed with HGG treated with combined surgery, radiation, chemotherapy, and anti-angiogenic therapy.

OUTLINE: This is a multicenter, feasibility, dose-escalation study of vorinostat, followed by a phase II study, followed by a phase III study.

FEASIBILITY STUDY: Patients undergo 3-D conformal radiotherapy (RT) or intensity-modulated RT 5 days a week for 6 weeks. Patients also receive vorinostat orally (PO) once daily on days 1-5. Courses repeat every week for 6 weeks in the absence of disease progression or unacceptable toxicity.

MAINTENANCE THERAPY: Beginning 4 weeks after completion of chemoradiotherapy, patients receive bevacizumab IV over 30-90 minutes on days 1 and 15 and temozolomide PO on days 1-5. Treatment repeats every 28 days for 12 courses in the absence of disease progression or unacceptable toxicity.

PHASE II STUDY: Patients are stratified according to extent of resection (near total resection or gross total resection vs other) and histology (glioblastoma multiforme vs other). Patients are randomized to 1 of 3 treatment arms.

ARM I: Patients undergo RT 5 days a week for 6 weeks and receive vorinostat at the maximum-tolerated dose determined in the feasibility study.

ARM II: Patients undergo RT as in the feasibility arm and receive temozolomide PO once daily for 42 days by day 5 of RT.

ARM III: Patients undergo RT as in the feasibility arm and receive bevacizumab IV over 30-90 minutes on days 22 and 36.

Maintenance therapy in arms I, II, III: Patients in all arms receive maintenance therapy as in the feasibility study.

PHASE III study: Patients are randomized to 1 of 2 treatment arms.

ARM IV: Patients receive RT and temozolomide as in phase II, arm II.

ARM V: Patients receive treatment as in phase II, arm I or phase II, arm III, whichever was established as the superior chemoradiotherapy arm in phase II.

Maintenance Therapy: Beginning 4 weeks after completion of chemoradiotherapy, patients receive bevacizumab IV over 30-90 minutes on days 1 and 15 and temozolomide PO on days 1-5. Treatment repeats every 28 days for 12 courses in the absence of disease progression or unacceptable toxicity. Some patients undergo blood and tumor tissue sample (from surgery) collection for telomerase activity, hTert expression, telomere length, and gene expression profiling and SNP arrays analysis.

After completion of study therapy, patients are followed up every 3 months for 1 year, every 6 months for 4 years, and then annually for 5 years.