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Pasqualini, Claudia; Kozaki, Tatsuya; Bruschi, Marco; Nguyen, Thi Hai Hoa; Minard-Colin, Véronique; Castel, David; Grill, Jacques; Ginhoux, Florent
Neuron, 12/2020, Volume: 108, Issue: 6Journal Article
Despite considerable recent advances in understanding and treating many other cancers, malignant brain tumors remain associated with low survival or severe long-term sequelae. Limited progress, including development of immunotherapies, relates in part to difficulties in accurately reproducing brain microenvironment with current preclinical models. The cellular interactions among resident microglia, recruited tumor-associated macrophages, stromal cells, glial cells, neurons, and cancer cells and how they affect tumor growth or behavior are emerging, yet many questions remain. The role of the blood-brain barrier, extracellular matrix components, and heterogeneity among tumor types and within different regions of a single tumor further complicate the matter. Here, we focus on brain microenvironment features impacted by tumor biology. We also discuss limits of current preclinical models and how complementary models, such as humanized animals and organoids, will allow deeper mechanistic insights on cancer biology, allowing for more efficient testing of therapeutic strategies, including immunotherapy, for brain cancers. In this review, Pasqualini et al. describe the tumor microenvironment in brain cancers and its impact on tumor behavior. They discuss how, compared to current preclinical models, humanized animals and organoids will allow more accurate evaluations of these complex interactions.
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