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Ref Type Journal Article
PMID (27225693)
Authors Soler A, Figueiredo AM, Castel P, Martin L, Monelli E, Angulo-Urarte A, Milà-Guasch M, Viñals F, Baselga J, Casanovas O, Graupera M
Title Therapeutic Benefit of Selective Inhibition of p110α PI3-Kinase in Pancreatic Neuroendocrine Tumors.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 22
Issue 23
Date 2016 Dec 01
URL
Abstract Text Mutations in the PI3K pathway occur in 16% of patients with pancreatic neuroendocrine tumors (PanNETs), which suggests that these tumors are an exciting setting for PI3K/AKT/mTOR pharmacologic intervention. Everolimus, an mTOR inhibitor, is being used to treat patients with advanced PanNETs. However, resistance to mTOR-targeted therapy is emerging partially due to the loss of mTOR-dependent feedback inhibition of AKT. In contrast, the response to PI3K inhibitors in PanNETs is unknown.In the current study, we assessed the frequency of PI3K pathway activation in human PanNETs and in RIP1-Tag2 mice, a preclinical tumor model of PanNETs, and we investigated the therapeutic efficacy of inhibiting PI3K in RIP1-Tag2 mice using a combination of pan (GDC-0941) and p110α-selective (GDC-0326) inhibitors and isoform-specific PI3K kinase-dead-mutant mice.Human and mouse PanNETs showed enhanced pAKT, pPRAS40, and pS6 positivity compared with normal tissue. Although treatment of RIP1-Tag2 mice with GDC-0941 led to reduced tumor growth with no impact on tumor vessels, the selective inactivation of the p110α PI3K isoform, either genetically or pharmacologically, reduced tumor growth as well as vascular area. Furthermore, GDC-0326 reduced the incidence of liver and lymph node metastasis compared with vehicle-treated mice. We also demonstrated that tumor and stromal cells are implicated in the antitumor activity of GDC-0326 in RIP1-Tag2 tumors.Our data provide a rationale for p110α-selective intervention in PanNETs and unravel a new function of this kinase in cancer biology through its role in promoting metastasis. Clin Cancer Res; 22(23); 5805-17. ©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
GDC-0326 GDC-0326 1 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
GDC-0326 PIK3CA inhibitor 16 GDC-0326 is a small molecule that inhibits PIK3CA, resulting in decreased downstream signaling and potentially leading to reduced tumor growth (PMID: 27225693, PMID: 26741947).
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
Unknown unknown islet cell tumor not applicable GDC-0326 Preclinical Actionable In a preclinical study, GDC-0326 inhibited AKT activation, decreased tumor growth, metastasis, and angiogenesis and increased lifespan in a transgenic mouse model of pancreatic neuroendocrine tumor (PMID: 27225693). 27225693
Unknown unknown islet cell tumor not applicable Pictilisib Preclinical Actionable In a preclinical study, Pictilisib (GDC-0941) inhibited AKT activation, reduced tumor burden, and increased lifespan in a transgenic mouse model of pancreatic neuroendocrine tumor (PMID: 27225693). 27225693