Conditions: Glioblastoma
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 921
Healthy volunteers: no

Brief summary:
This 2 arm study investigated the efficacy and safety of the addition of bevacizumab to the current standard of care (multimodality therapy of concurrent radiotherapy plus temozolomide followed by adjuvant temozolomide) as compared to the current standard of care alone. Participants were randomly assigned to either the bevacizumab (10 milligrams per kilogram (mg/kg) intravenously \[IV\] once every 2 week \[q2w\]) or the placebo arm, in combination with radiation therapy (total dose 60 Gray \[Gy\], administered as 2 Gy fractions, 5 days/week) plus temozolomide (75 milligrams per meter squared \[mg/m\^2\] oral administration \[po\] daily) for 6 weeks. After a 4 week treatment break, participants continued to receive bevacizumab (10 mg/kg IV q2w) or placebo, plus temozolomide (150-200 mg/m\^2 po daily on days 1-5 of each 4 week cycle) for 6 cycles of maintenance treatment or until disease progression or unacceptable toxicity, whichever occured first. Following the maintenance phase, bevacizumab (15 mg/kg iv every 3 weeks \[q3w\]) or placebo monotherapy continued. The time on study treatment was until disease progression.

Detailed description:

Arms:
arm 1: In the Concurrent Phase participants will receive radiotherapy (RT) in daily fractions of 2 Gy to be given 5 days per week for 6 weeks and temozolomide 75 mg/m\^2 daily from the first day to the last day of radiotherapy (it may continue for a maximum of 49 days in case of delay to the end of radiation therapy) and bevacizumab 10 mg/kg IV every 2 weeks for 6 weeks. There will be a 4 week treatment break. Participants will then enter the Maintenance Phase where they receive six 28-day cycle of bevacizumab 10 mg/kg IV q2w and temozolomide 150 to 200 mg/m\^2 daily in the first 5 days of each cycle. The participants will then enter the Monotherapy Phase where they will receive bevacizumab 15 mg/kg IV q3w until disease progression/unacceptable toxicity. arm 2: In the Concurrent Phase participants will receive radiotherapy in daily fractions of 2 Gy to be given 5 days per week for 6 weeks and temozolomide 75 mg/m\^2 daily from the first day to the last day of radiotherapy (it may continue for a maximum of 49 days in case of delay to the end of radiation therapy) and placebo IV every 2 weeks for 6 weeks. There will be a 4 week treatment break. Participants will then enter the Maintenance Phase where they will receive six 28-day cycle of placebo IV q2w and temozolomide 150 to 200 mg/m\^2 daily in the first 5 days of each cycle. The participants will then enter the Monotherapy Phase where they will receive placebo IV q3w until disease progression/unacceptable toxicity.

Interventions: intervention 1: Bevacizumab intervention 2: Temozolomide intervention 3: Radiation therapy intervention 4: Placebo
Intervention descriptions: intervention 1: 10 mg/kg intravenously q2w in the Concurrent and Maintenance Phases. 15 mg/kg intravenously q3w in the Monotherapy Phase. intervention 2: 75 mg/m\^2 once daily for 6 weeks, followed by 150-200 mg/m\^2 once daily on days 1-5 of six 4 week cycles. intervention 3: 30 fractions of 2 Gy delivered on days 1-5 per week for 6 weeks. intervention 4: Intravenously q2w in the Concurrent and Maintenance Phases and q3w in the Monotherapy Phase.

Protocol document: