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Ref Type | Journal Article | ||||||||||||
PMID | (27199435) | ||||||||||||
Authors | Quail DF, Bowman RL, Akkari L, Quick ML, Schuhmacher AJ, Huse JT, Holland EC, Sutton JC, Joyce JA | ||||||||||||
Title | The tumor microenvironment underlies acquired resistance to CSF-1R inhibition in gliomas. | ||||||||||||
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Abstract Text | Macrophages accumulate with glioblastoma multiforme (GBM) progression and can be targeted via inhibition of colony-stimulating factor-1 receptor (CSF-1R) to regress high-grade tumors in animal models of this cancer. However, whether and how resistance emerges in response to sustained CSF-1R blockade is unknown. We show that although overall survival is significantly prolonged, tumors recur in >50% of mice. Gliomas reestablish sensitivity to CSF-1R inhibition upon transplantation, indicating that resistance is tumor microenvironment-driven. Phosphatidylinositol 3-kinase (PI3K) pathway activity was elevated in recurrent GBM, driven by macrophage-derived insulin-like growth factor-1 (IGF-1) and tumor cell IGF-1 receptor (IGF-1R). Combining IGF-1R or PI3K blockade with CSF-1R inhibition in recurrent tumors significantly prolonged overall survival. Our findings thus reveal a potential therapeutic approach for treating resistance to CSF-1R inhibitors. |
Molecular Profile | Treatment Approach |
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Gene Name | Source | Synonyms | Protein Domains | Gene Description | Gene Role |
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Therapy Name | Drugs | Efficacy Evidence | Clinical Trials |
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Drug Name | Trade Name | Synonyms | Drug Classes | Drug Description |
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Gene | Variant | Impact | Protein Effect | Variant Description | Associated with drug Resistance |
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Molecular Profile | Indication/Tumor Type | Response Type | Therapy Name | Approval Status | Evidence Type | Efficacy Evidence | References |
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PTEN loss | glioblastoma | no benefit | BLZ945 | Preclinical | Actionable | In a preclinical study, BLZ945 resulted in limited benefit in transgenic mouse models of glioblastoma harboring a loss of PTEN (PMID: 27199435). | 27199435 |
TP53 loss | glioblastoma | sensitive | BLZ945 | Preclinical | Actionable | In a preclinical study, treatment with BLZ945 demonstrated some efficacy, specifically a 56% tumor reduction, in transgenic mouse models of glioblastoma with a loss of TP53 (PMID: 27199435). | 27199435 |