Reference Detail

Ref Type

Journal Article

PMID

(26206338)

Authors

Raja M, Zverev M, Seipel K, Williams GT, Clarke AR, Shaw PH

Title

Assessment of the In Vivo Activity of PI3K and MEK Inhibitors in Genetically Defined Models of Colorectal Cancer.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Molecular cancer therapeutics	14	10	2015 Oct	2175-86	Mol Cancer Ther

URL

Abstract Text

The objective of tailoring medicines for cancer patients according to the molecular profile of their disease holds great promise for the improvement of cancer therapy. Nevertheless, this approach has been limited, in part, due to the lack of predictive and informative preclinical studies. Herein, we describe an assessment of the therapeutic potential of targeting PI3K/mTOR and MAPK signaling in genetically defined mouse models of colorectal cancer mirroring disease subtypes targeted for novel therapy in the FOCUS4 trial. Our studies demonstrate that dual PI3K/mTOR inhibition is highly effective in invasive adenocarcinoma models characterized by combinatorial mutations in Apc and Pten; Apc and Kras; and Apc, Pten and Kras. MEK inhibition was effective in the combinatorial Apc and Kras setting, but had no impact in either Apc Pten mutants or in Apc Pten Kras triple mutants. Furthermore, we describe the importance of scheduling for combination studies and show that although no additional benefit is gained in Apc Pten mice, combination of PI3K/mTOR and MAPK inhibition leads to an additive benefit in survival in Apc Kras mice and a synergistic increase in survival in Apc Pten Kras mice. This is the first study using robust colorectal cancer genetically engineered mouse models to support the validity of PI3K/mTOR and MEK inhibitors as tailored therapies for colorectal cancer and highlight the potential importance of drug scheduling in the clinic.

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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
APC inact mut PTEN inact mut	colorectal cancer	sensitive	Dactolisib	Preclinical	Actionable	In a preclinical study, BEZ235 inhibited PI3K/mTOR signaling in tumors and increased survival in transgenic animal models of colorectal cancer driven by APC and PTEN inactivation (PMID: 26206338).	26206338
APC inact mut PTEN inact mut	colorectal cancer	no benefit	Binimetinib + Dactolisib	Preclinical	Actionable	In a preclinical study, combination of BEZ235 and Binimetinib (MEK162) did not improve survival compared to single agent in transgenic animal models of colorectal cancer driven by APC and PTEN inactivation (PMID: 26206338).	26206338
APC inact mut PTEN inact mut	colorectal cancer	no benefit	Binimetinib	Preclinical	Actionable	In a preclinical study, Binimetinib (MEK162) reduced proliferation in tumors acutely but did not improve survival in transgenic animal models of colorectal cancer driven by APC and PTEN inactivation (PMID: 26206338).	26206338