Avastin in Combination With Radiation (XRT) & Temozolomide, Followed by Avastin, Temozolomide and Irinotecan for Glioblastoma (GBM) and Gliosarcomas

Avastin will be administered 10 mg/kg every other week beginning a minimum of 28 days after last major surgical procedure, open biopsy, or significant traumatic injury. Following completion of XRT, patients will receive treatment that includes 6 cycles of Avastin, beginning a minimum of 14 days after last XRT.

Daily temozolomide 75 mg/m2/day for 6.5 weeks of radiation treatment. Following completion of XRT, patients will receive treatment including temozolomide 200 mg/m2/day on the 1st 5 days of each 28-day cycle.

Treatment with standard XRT (radiation) for 6.5 weeks.

Following completion of XRT, patients will receive 6 cycles of treatment that includes irinotecan. Beginning a minimum of 14 days after last XRT, the irinotecan dose will depend on whether the patient is on enzyme-inducing antiepileptic drugs (EIAED). (EIAED:340 mg/m2 every other week, non-EIAED: 125 mg/m2.)