The proposal is to study gene expression and early epigenetic changes in myeloid cells from brain tumors and co-culture experiments. Tough RNA-seq, ATAC-seg and subsequent analysis to monitor the differential gene expression through different time points followed by stimuli. The study will compare the obtained results with sequencing data from microglia of full-fledged human tumor samples (glioblastoma and low grade gliomas). Additionally it will evaluated the immunologic characteristic of the tumor through cytokines levels analysis (TNF-α, IL-4, IL-6, IL-8, IL-10, IL-13, IFN-γ, TGF-β e IL-1ra).