Many studies have elucidated the important role played by the tumor microenvironment in cancer evolution. In
particular the formation of hypoxic areas within the expanding mass of a solid tumor and the consequent induction of an
angiogenic switch are crucial steps that shape tumor progression. Focusing on glioblastoma multiforme (GBM), the most
common and lethal brain cancer in the adult, I will review recent data that show how the microenvironment regulates
crucial functions of glioblastoma stem cells (GSCs) which in turn affect the angiogenic process.
Keywords: Angiogenesis, cancer stem cells, glioblastoma multiforme, hypoxia, microenvironment, stem cell niche, tumorigenesis, fluorescence-activated, neoplastic heterogeneity
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