Reference Detail

Ref Type Journal Article
PMID (20371716)
Authors Mallon R, Hollander I, Feldberg L, Lucas J, Soloveva V, Venkatesan A, Dehnhardt C, Delos Santos E, Chen Z, Dos Santos O, Ayral-Kaloustian S, Gibbons J
Title Antitumor efficacy profile of PKI-402, a dual phosphatidylinositol 3-kinase/mammalian target of rapamycin inhibitor.
Journal Molecular cancer therapeutics
Vol 9
Issue 4
Date 2010 Apr
URL
Abstract Text PKI-402 is a selective, reversible, ATP-competitive, equipotent inhibitor of class I phosphatidylinositol 3-kinases (PI3K), including PI3K-alpha mutants, and mammalian target of rapamycin (mTOR; IC(50) versus PI3K-alpha = 2 nmol/L). PKI-402 inhibited growth of human tumor cell lines derived from breast, brain (glioma), pancreas, and non-small cell lung cancer tissue and suppressed phosphorylation of PI3K and mTOR effector proteins (e.g., Akt at T308) at concentrations that matched those that inhibited cell growth. In MDA-MB-361 [breast: Her2(+) and PIK3CA mutant (E545K)], 30 nmol/L PKI-402 induced cleaved poly(ADP-ribose) polymerase (PARP), a marker for apoptosis. In vivo, PKI-402 inhibited tumor growth in MDA-MB-361, glioma (U87MG), and lung (A549) xenograft models. In MDA-MB-361, PKI-402 at 100 mg/kg (daily for 5 days, one round) reduced initial tumor volume of 260 mm(3) to 129 mm(3) and prevented tumor regrowth for 70 days. In MDA-MB-361 tumors, PKI-402 (100 mg/kg, single dose) suppressed Akt phosphorylation (at T308) and induced cleaved PARP. Suppression of phosphorylated Akt (p-Akt) was complete at 8 hours and still evident at 24 hours. Cleaved PARP was evident at 8 and 24 hours. In normal tissue (heart and lung), PKI-402 (100 mg/kg) had minimal effect on p-Akt, with no detectable cleaved PARP. Preferential accumulation of PKI-402 in tumor tissue was observed. Complete, sustained suppression of Akt phosphorylation may cause tumor regression in MDA-MB-361 and other xenograft models. We are testing whether dual PI3K/mTOR inhibitors can durably suppress p-Akt, induce cleaved PARP, and cause tumor regression in a diverse set of human tumor xenograft models. Mol Cancer Ther; 9(4); 976-84. (c)2010 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
PKI-402 PKI-402 3 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
PKI-402 mTOR Inhibitor 50 PI3K Inhibitor (Pan) 34 PKI-402 is a dual ATP-competitive mTOR/PI3K inhibitor, which leads to reduced downstream signaling, potentially resulting in decreased tumor growth (PMID: 20371716).
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 Advanced Solid Tumor not applicable PKI-402 Preclinical - Cell culture Actionable In a preclinical study, PKI-402 inhibited growth of several human solid tumor cell lines in culture (PMID: 20371716). 20371716
PTEN loss glioblastoma multiforme sensitive PKI-402 Preclinical - Cell line xenograft Actionable In a preclinical study, PKI-402 inhibited tumor growth in PTEN-negative glioblastoma multiforme cell line xenograft models (PMID: 20371716). 20371716
PIK3CA E545K breast cancer sensitive PKI-402 Preclinical - Cell line xenograft Actionable In a preclinical study, treatment with PKI-402 resulted in decreased Akt phosphorylation and tumor regression in ERBB2 (HER2)-positive breast cancer cell line xenograft models harboring PIK3CA E545K (PMID: 20371716). 20371716