• Overall survival (OS) [ Designated as safety issue: No ]
  

• Progression-free survival (PFS) [ Designated as safety issue: No ]
  
• Comparison of OS and PFS in patients with unmethylated MGMT [ Designated as safety issue: No ]
  
• Comparison of OS and PFS in patients with methylated MGMT [ Designated as safety issue: No ]
  
• Correlation of tumor MGMT gene methylation status with treatment response [ Designated as safety issue: No ]
  
• Toxicity [ Designated as safety issue: Yes ]
  
• Correlation of PFS with OS at 6 months [ Designated as safety issue: No ]
  

OBJECTIVES:

Primary

• Determine if dose-intensifying (increasing the "dose-density") the adjuvant temozolomide component of the chemoradiation treatment enhances treatment efficacy as measured by overall survival of patients with newly diagnosed glioblastoma or gliosarcoma.

Secondary

• Determine if dose-intensifying the adjuvant temozolomide component of the chemoradiation treatment enhances treatment efficacy as measured by progression-free survival.
• Determine in patients with unmethylated MGMT if dose-intensifying the adjuvant temozolomide component of the chemoradiation treatment enhances treatment efficacy (overall and progression-free survival) compared with patients receiving conventional temozolomide dosing.
• Determine in patients with methylated MGMT if dose-intensifying the adjuvant temozolomide component of the chemoradiation treatment enhances treatment efficacy (overall and progression-free survival) compared with patients receiving conventional temozolomide dosing.
• Determine if there is an association between tumor MGMT gene methylation status and treatment response.
• Compare and record the toxicities of the conventional and dose-intense chemotherapy regimens.
• Evaluate whether 6-month progression-free survival is associated with overall survival.

OUTLINE: This is a randomized, multicenter study. Patients are stratified according to recursive partitioning analysis class (III vs IV vs V) and MGMT gene methylation status (methylated vs nonmethylated vs indeterminate).

Patients undergo radiotherapy daily, 5 days per week for 6 weeks. Patients also receive oral temozolomide daily during radiotherapy. Patients are then randomized to 1 of 2 treatment arms. Treatment begins 4 weeks after completion of radiotherapy.

• Arm I: Patients receive oral temozolomide on days 1-5.
• Arm II: Patients receive oral temozolomide on days 1-21. In both arms, treatment repeats every 28 days for up to 6 courses in the absence of disease progression or unacceptable toxicity. Patients with responding disease may receive up to 6 more courses of temozolomide.

After completion of study treatment, patients are followed every 3 months for 1 year, every 4 months for 2 years, and then every 6 months thereafter.

Peer Reviewed and Funded or Endorsed by Cancer Research UK

PROJECTED ACCRUAL: A total of 834 patients will be accrued for this study.

DISEASE CHARACTERISTICS:

• Histologically proven glioblastoma or gliosarcoma

  • Diagnosis must be made by open biopsy or tumor resection

    • Diagnosis by stereotactic biopsy not allowed
  • Tumor must have supratentorial component

  • Contrast-enhanced MRI or CT scan (if MRI is not available) of the brain must be performed preoperatively and postoperatively prior to initiation of radiotherapy, within 28 days prior to study entry

    • If pre- and postoperative contrast-enhanced CT scans are obtained, must be of sufficient quality

• Meets 1 of the following recursive positioning analysis classifications:

  • Class III

    • Age < 50 years
    • Karnofsky performance status (KPS) 90-100%

  • Class IV, meeting 1 of the following criteria:

    • Age < 50 years and KPS < 90%
    • Age ≥ 50 years and underwent prior partial or total tumor resection with no worse than minor neurofunction impairment

  • Class V, meeting 1 of the following criteria:

    • Age ≥ 50 years and underwent prior partial or total tumor resection with worse than minor neurofunction impairment
    • Age ≥ 50 years and underwent prior tumor biopsy only
    • Age ≥ 50 years, KPS 60-100%, and normal mental status
• Underwent surgery to remove the brain tumor within the past 5 weeks
• No recurrent or multifocal malignant gliomas
• At least 1 block of tissue available for analysis of MGMT gene methylation status
• No metastases detected below the tentorium or beyond the cranial vault

PATIENT CHARACTERISTICS:

• KPS 60-100%
• Absolute neutrophil count ≥ 1,500/mm^3
• Platelet count ≥ 100,000/mm^3
• Hemoglobin ≥ 10 g/dL (transfusion or other intervention allowed)
• BUN ≤ 25 mg/dL
• Creatinine ≤ 1.7 mg/dL
• Bilirubin ≤ 2.0 mg/dL
• AST and ALT ≤ 3 times normal
• Negative pregnancy test
• Not pregnant or nursing
• Fertile patients must use effective contraception
• No prior invasive malignancy (except for nonmelanomatous skin cancer) unless patient is disease-free for ≥ 3 years (e.g., carcinoma in situ of the breast, oral cavity, or cervix allowed)

• No severe, active comorbidity, including any of the following:

  • Unstable angina and/or congestive heart failure requiring hospitalization
  • Transmural myocardial infarction within the last 6 months
  • Acute bacterial or fungal infection requiring intravenous antibiotics at the time of registration
  • Chronic obstructive pulmonary disease exacerbation or other respiratory illness requiring hospitalization or precluding study therapy at the time of registration
  • Known hepatic insufficiency resulting in clinical jaundice and/or coagulation defects
  • Known AIDS based upon current CDC definition
  • Major medical illnesses or psychiatric impairments that, in the investigator's opinion, will prevent administration or completion of protocol therapy
  • Active connective tissue disorders, such as lupus or sclerodema that, in the opinion of the treating physician, may put the patient at high risk for radiation toxicity
• No prior allergic reaction to temozolomide

PRIOR CONCURRENT THERAPY:

• See Disease Characteristics
• Recovered from the effects of surgery, postoperative infection, and other complications prior to study entry

• No prior chemotherapy or radiosensitizers (including polifeprosan 20 with carmustine implant [Gliadel wafers] or any other intratumoral or intracavitary treatment) for cancers of the head and neck region

  • Prior chemotherapy for a different cancer is allowed
• No prior radiotherapy to the head or neck (except for T1 glottic cancer) that resulted in an overlap of radiation fields
• No participation in other therapeutic clinical protocols within 30 days prior to study entry or during participation in the study
• No concurrent prophylactic growth factors
• No other concurrent investigational drugs
• No concurrent surgical procedures for tumor debulking
• No other concurrent chemotherapy, immunotherapy, or biologic therapy
• No additional concurrent stereotactic boost radiotherapy
• No concurrent intensity-modulated radiotherapy
• Concurrent steroids allowed provided dose is stable or decreasing in the past 5 days