Erlotinib in Treating Patients With Recurrent Glioblastoma Multiforme or Gliosarcoma

Tarceva will be self-administered in an open-label, unblinded manner to all patients enrolled in the study. During the treatment period, patients who are not receiving EIAED (Group A) will receive single-agent Tarceva, 150 mg/day. Patients on EIAED (Group B) will receive single-agent Tarceva, 600 mg/day. Tablets should be taken at the same time each day with 200 mL of water at least 1 hour before or 2 hours after a meal. Patients who are unable to swallow tablets may dissolve the tablets in distilled water for administration. The dose of Tarceva will be escalated after 14 days to 200 mg/day (Group A) or 650 mg/day (Group B) assuming no intolerable grade 2 rash, any grade 3 rash, or grade 2 diarrhea despite loperamide.