U87-MG (ATCC HTB-14), U251 (Sigma-Aldrich), and LN229 (ATCC CRL2611) human glioblastoma cells and THP1 human monocytes (ATCC TIB-202) were passaged fewer than six months and verified by providing companies using short tandem repeat (STR) profiling and confirmed to be Mycoplasma free. Cells for culture were obtained from U87-BevR, U87-BevS, SF7300, and SF7796 xenografts generated as described3 (link), 19 (link). Glioblastoma cells were cultured in DMEM High Glucose/F-12 50/50% mixture media with 10% FBS and 1% penicillin/streptomycin at 37°C. THP1 cells were cultured in RPMI-1640 medium with 10% FBS, L-glutamine (2 mmol/L), 2-mercaptoethanol (55 µM; Gibco), and 1% penicillin/streptomycin at 37°C.