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Ref Type Journal Article
PMID (24634413)
Authors Yu P, Laird AD, Du X, Wu J, Won KA, Yamaguchi K, Hsu PP, Qian F, Jaeger CT, Zhang W, Buhr CA, Shen P, Abulafia W, Chen J, Young J, Plonowski A, Yakes FM, Chu F, Lee M, Bentzien F, Lam ST, Dale S, Matthews DJ, Lamb P, Foster P
Title Characterization of the activity of the PI3K/mTOR inhibitor XL765 (SAR245409) in tumor models with diverse genetic alterations affecting the PI3K pathway.
Journal Molecular cancer therapeutics
Vol 13
Issue 5
Date 2014 May
URL
Abstract Text Activation of the PI3K (phosphoinositide 3-kinase) pathway is a frequent occurrence in human tumors and is thought to promote growth, survival, and resistance to diverse therapies. Here, we report pharmacologic characterization of the pyridopyrimidinone derivative XL765 (SAR245409), a potent and highly selective pan inhibitor of class I PI3Ks (α, β, γ, and δ) with activity against mTOR. Broad kinase selectivity profiling of >130 protein kinases revealed that XL765 is highly selective for class I PI3Ks and mTOR over other kinases. In cellular assays, XL765 inhibits the formation of PIP(3) in the membrane, and inhibits phosphorylation of AKT, p70S6K, and S6 phosphorylation in multiple tumor cell lines with different genetic alterations affecting the PI3K pathway. In a panel of tumor cell lines, XL765 inhibits proliferation with a wide range of potencies, with evidence of an impact of genotype on sensitivity. In mouse xenograft models, oral administration of XL765 results in dose-dependent inhibition of phosphorylation of AKT, p70S6K, and S6 with a duration of action of approximately 24 hours. Repeat dose administration of XL765 results in significant tumor growth inhibition in multiple human xenograft models in nude mice that is associated with antiproliferative, antiangiogenic, and proapoptotic effects.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Voxtalisib Voxtalisib 4 2
Drug Name Trade Name Synonyms Drug Classes Drug Description
Voxtalisib XL765|XL-765|SAR245409|SAR-245409 mTOR Inhibitor 51 PI3K Inhibitor (Pan) 38 Voxtalisib (XL765) inhibits both PI3K and mTOR kinases and results in inhibition of PI3K pathway signaling, thereby possibly leading to inhibition of cell proliferation, reduced tumor vascularization, and inhibition of tumor growth (PMID: 24634413, PMID: 31870556).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
PIK3CA E545K breast cancer sensitive Voxtalisib Preclinical - Cell line xenograft Actionable In a preclinical study, a breast cancer cell line harboring PIK3CA E545K was sensitive to XL765 (SAR245409), demonstrating inhibition of cell proliferation and colony formation in culture, and inhibition of tumor growth in cell line xenograft models (PMID: 24634413). 24634413
PIK3CA amp ovarian cancer sensitive Voxtalisib Preclinical - Cell line xenograft Actionable In a preclinical study, an ovarian cancer cell line harboring PIK3CA E545K was sensitive to XL765 (SAR245409), demonstrating inhibition of cell proliferation in culture, and inhibition of tumor growth in cell line xenograft models (PMID: 24634413). 24634413