Reference Detail

Ref Type

Journal Article

PMID

(27196754)

Authors

Bonnevaux H, Lemaitre O, Vincent L, Levit MN, Windenberger F, Halley F, Delorme C, Lengauer C, Garcia-Echeverria C, Virone-Oddos A

Title

Concomitant Inhibition of PI3Kβ and BRAF or MEK in PTEN-Deficient/BRAF-Mutant Melanoma Treatment: Preclinical Assessment of SAR260301 Oral PI3Kβ-Selective Inhibitor.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Molecular cancer therapeutics	15	7	2016 Jul	1460-71	Mol Cancer Ther

URL

Abstract Text

Class IA PI3K pathway activation resulting from PTEN deficiency has been associated with lack of sensitivity of melanoma to BRAF kinase inhibitors. Although previous studies have shown synergistic activity when pan-PI3K inhibitors were combined with MAPK inhibitors in the treatment of melanoma exhibiting concurrent genetic abnormalities, overlapping adverse events in patients limit optimal dosing and clinical application. With the aim of specifically targeting PTEN-deficient cancers and minimizing the potential for on-target toxicity when inhibiting multiple PI3K isoforms, we developed a program to discover PI3Kβ-selective kinase inhibitors and identified SAR260301 as a potent PI3Kβ-selective, orally available compound, which is now in clinical development. Herein, we provide a detailed biological characterization of SAR260301, and show that this compound has outstanding biochemical and cellular selectivity for the PI3Kβ isoform versus the α, δ, and γ isoforms and a large panel of protein and lipid kinases. We demonstrate that SAR260301 blocks PI3K pathway signaling preferentially in PTEN-deficient human tumor models, and has synergistic antitumor activity when combined with vemurafenib (BRAF inhibitor) or selumetinib (MEK inhibitor) in PTEN-deficient/BRAF-mutated human melanoma tumor models. Combination treatments were very well tolerated, suggesting the potential for a superior safety profile at optimal dosing using selective compounds to inhibit multiple signaling pathways. Together, these experiments provide a preclinical proof-of-concept for safely combining inhibitors of PI3Kβ and BRAF or MEK kinase modulators to improve antitumor activity in PTEN-deficient/BRAF-mutant melanoma, and support the evaluation of SAR260301-based combinations in clinical studies. Mol Cancer Ther; 15(7); 1460-71. ©2016 AACR.

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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

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

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
BRAF mut PTEN loss	melanoma	sensitive	SAR260301 + Selumetinib	Preclinical - Cell line xenograft	Actionable	In a preclinical study, SAR260301 and Selumetinib (AZD6244) synergistically inhibited proliferation of PTEN deficient melanoma cells harboring BRAF mutations in culture and suppressed tumor growth in cell line xenograft models (PMID: 27196754).	27196754
PTEN loss	prostate carcinoma	decreased response	SAR260301	Preclinical - Cell line xenograft	Actionable	In a precliinical study, PTEN deficient prostate carcinoma cells demonstrated reduced response to SAR260301 in cell culture and in cell line xenograft models (PMID: 27196754).	27196754
BRAF mut PTEN loss	melanoma	sensitive	SAR260301	Preclinical - Cell line xenograft	Actionable	In a preclinical study, SAR260301 inhibited proliferation of PTEN deficient melanoma cells harboring BRAF mutations in culture and suppressed tumor growth in cell line xenograft models (PMID: 27196754).	27196754
BRAF mut PTEN loss	melanoma	sensitive	SAR260301 + Vemurafenib	Preclinical - Cell line xenograft	Actionable	In a preclinical study, SAR260301 and Zelboraf (vemurafenib) synergistically inhibited proliferation of PTEN deficient melanoma cells harboring BRAF mutations in culture and suppressed tumor growth in cell line xenograft models (PMID: 27196754).	27196754