- Patients who have had prior chemotherapy within the past 4 weeks (6 weeks for nitrosoureas or mitomycin C). Patients must be off treatment with Temozolomide for at least 23 days. Patients who received non-cytotoxic drug therapy must be off treatment for at least 2 weeks. For patients enrolling in Part 1 or Part 3 AND who have progressed on a prior bevacizumab-containing regimen, patients may continue treatment with bevacizumab 10 mg/kg monotherapy, with last dose of bevacizumab administered no fewer than 14 days from start of Plerixafor and bevacizumab. For participants enrolling in Part 1 or Part 3 AND who have progressed on a prior anti-VEGF(R) (other than bevacizumab) containing regimen, patients must be off anti-VEGF(R) treatment for at least 28 days before receiving Plerixafor and bevacizumab. For patients enrolled in Part 2 (surgical substudy) AND who have progressed on a prior bevacizumab or other anti-VEGF(R) containing regimen, patients must be off anti-VEGF(R) treatment for at least 28 days prior to surgery.