Reference Detail

Ref Type Journal Article
PMID (27872130)
Authors Saura C, Roda D, Roselló S, Oliveira M, Macarulla T, Pérez-Fidalgo JA, Morales-Barrera R, Sanchis-García JM, Musib L, Budha N, Zhu J, Nannini M, Chan WY, Sanabria Bohórquez SM, Meng RD, Lin K, Yan Y, Patel P, Baselga J, Tabernero J, Cervantes A
Title A First-in-Human Phase I Study of the ATP-Competitive AKT Inhibitor Ipatasertib Demonstrates Robust and Safe Targeting of AKT in Patients with Solid Tumors.
Journal Cancer discovery
Vol 7
Issue 1
Date 2017 Jan
URL
Abstract Text Activation of AKT signaling by PTEN loss or PIK3CA mutations occurs frequently in human cancers, but targeting AKT has been difficult due to the mechanism-based toxicities of inhibitors that target the inactive conformation of AKT. Ipatasertib (GDC-0068) is a novel selective ATP-competitive small-molecule inhibitor of AKT that preferentially targets active phosphorylated AKT (pAKT) and is potent in cell lines with evidence of AKT activation. In this phase I study, ipatasertib was well tolerated; most adverse events were gastrointestinal and grade 1-2 in severity. The exposures of ipatasertib ≥200 mg daily in patients correlated with preclinical TGI90, and pharmacodynamic studies confirmed that multiple targets (i.e., PRAS40, GSK3β, and mTOR) were inhibited in paired on-treatment biopsies. Preliminary antitumor activity was observed; 16 of 52 patients (30%), with diverse solid tumors and who progressed on prior therapies, had radiographic stable disease, and many of their tumors had activation of AKT.Potent inhibition of AKT signaling with ipatasertib was associated with a tolerable safety profile and meaningful disease control in a subgroup of patients. Targeting pAKT with an ATP-competitive inhibitor provides a greater therapeutic window than allosteric inhibitors. Further investigation with ipatasertib is ongoing in phase II studies. Cancer Discov; 7(1); 102-13. ©2016 AACR.This article is highlighted in the In This Issue feature, p. 1.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Therapy Description
Drug Name Trade Name Synonyms Drug Classes Drug Description
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
AKT1 E17K Her2-receptor negative breast cancer sensitive Ipatasertib Phase I Actionable In a Phase I trial, a patient with ERBB2 (HER2)-receptor negative breast cancer harboring AKT1 E17K demonstrated a complete metabolic response when treated with Ipatasertib (GDC-0068) (PMID: 27872130). 27872130
PTEN loss prostate cancer sensitive Ipatasertib Phase I Actionable In a Phase I trial, a patient with castration resistant prostate cancer harboring a loss of PTEN demonstrated an improved prostate specific antigen when treated with Ipatasertib (GDC-0068) (PMID: 27872130). 27872130
Unknown unknown Advanced Solid Tumor not applicable Ipatasertib Preclinical - Cell line xenograft Actionable In a preclinical study, Ipatasertib (GDC-0068) demonstrated activity against tumor growth in cell line xenograft models of solid tumors (PMID: 24141624). 24141624
Unknown unknown Advanced Solid Tumor not applicable Ipatasertib Phase I Actionable In a Phase I trial, Ipatasertib (GDC-0068) resulted in antitumor activity in 30% (16/52) of patients with advanced solid tumors, primarily demonstrating stable disease (PMID: 27872130). 27872130