Patients undergo blood sample collection periodically for pharmacological studies. Samples are analyzed for everolimus blood levels and correlated with 18FDG uptake suppression in tumor and normal brain via LC-MSMS. Previously collected tumor tissue are analyzed for protein biomarkers including PTEN gene expression levels via fluorescence in situ hybridization (FISH) and immunohistochemistry (IHC) and phosphorylation on Ser473 and Ser308 of Akt and MGMT expression and promoter methylation via IHC. Samples are also analyzed for DNA sequencing. Some samples are banked for future studies.