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Learn MoreTumor microenvironment-targeted therapies are emerging as promising treatment options for different tumor types. Tumor-associated macrophages/microglia (TAMs) represent the most abundant non-malignant cell type in brain metastasis and are known to support metastatic colonization and outgrowth. We used the colony-stimulating factor 1 receptor (Csf1r) inhibitor BLZ945 to target TAMs at distinct stages of the metastatic cascade in experimental breast-to-brain metastasis and demonstrate that Csf1r inhibition leads to anti-tumor responses in prevention and intervention trails. However, compensatory Csf2-mediated pro-inflammatory TAM activation blunts long-term efficacy of Csf1r inhibition by inducing signatures associated with neuroinflammation followed by wound repair responses that foster tumor recurrence. Combined blockade of Csf1r and Csf2rb-Stat5 signaling leads to sustained tumor control and a normalization of microglial activation states. SOURCE: Florian Klemm (florian.klemm@unil.ch) - Johanna Joyce University of Lausanne, Ludwig Center for Cancer Research
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