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Ref Type Journal Article
PMID (21325073)
Authors Mallon R, Feldberg LR, Lucas J, Chaudhary I, Dehnhardt C, Santos ED, Chen Z, dos Santos O, Ayral-Kaloustian S, Venkatesan A, Hollander I
Title Antitumor efficacy of PKI-587, a highly potent dual PI3K/mTOR kinase inhibitor.
Journal Clinical cancer research : an official journal of the American Association for Cancer Research
Vol 17
Issue 10
Date 2011 May 15
URL
Abstract Text The aim of this study was to show preclinical efficacy and clinical development potential of PKI-587, a dual phosphoinositide 3-kinase (PI3K)/mTOR inhibitor.In vitro class 1 PI3K enzyme and human tumor cell growth inhibition assays and in vivo five tumor xenograft models were used to show efficacy.In vitro, PKI-587 potently inhibited class I PI3Ks (IC(50) vs. PI3K-α = 0.4 nmol/L), PI3K-α mutants, and mTOR. PKI-587 inhibited growth of 50 diverse human tumor cell lines at IC(50) values of less than 100 nmol/L. PKI-587 suppressed phosphorylation of PI3K/mTOR effectors (e.g., Akt), and induced apoptosis in human tumor cell lines with elevated PI3K/mTOR signaling. MDA-MB-361 [breast; HER2(+), PIK3CA mutant (E545K)] was particularly sensitive to this effect, with cleaved PARP, an apoptosis marker, induced by 30 nmol/L PKI-587 at 4 hours. In vivo, PKI-587 inhibited tumor growth in breast (MDA-MB-361, BT474), colon (HCT116), lung (H1975), and glioma (U87MG) xenograft models. In MDA-MB-361 tumors, PKI-587 (25 mg/kg, single dose i.v.) suppressed Akt phosphorylation [at threonine(T)308 and serine(S)473] for up to 36 hours, with cleaved PARP (cPARP) evident up to 18 hours. PKI-587 at 25 mg/kg (once weekly) shrank large (∼1,000 mm(3)) MDA-MB-361 tumors and suppressed tumor regrowth. Tumor regression correlated with suppression of phosphorylated Akt in the MDA-MB-361 model. PKI-587 also caused regression in other tumor models, and efficacy was enhanced when given in combination with PD0325901 (MEK 1/2 inhibitor), irinotecan (topoisomerase I inhibitor), or HKI-272 (neratinib, HER2 inhibitor).Significant antitumor efficacy and a favorable pharmacokinetic/safety profile justified phase 1 clinical evaluation of PKI-587.

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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
Gedatolisib Gedatolisib 13 3
PKI-179 PKI-179 1 0
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gedatolisib PKI-587|PF-05212384|PF 05212384 mTOR Inhibitor 51 PI3K Inhibitor (Pan) 38 Gedatolisib (PF-05212384) is an ATP-competitive inhibitor that targets phosphatidylinositol 3 kinase (PI3K) and mammalian target of rapamycin (mTOR) in the PI3K/mTOR signaling pathway, and may result in antitumor activity, including inhibition of tumor growth and tumor regression (PMID: 21325073, PMID: 31822716).
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
ERBB2 amp PIK3CA H1047R breast cancer sensitive Gedatolisib Preclinical Actionable In a preclinical study, Gedatolisib (PKI-587) inhibited growth of human breast cancer cells harboring ERBB2 (HER2) amplification and PIK3CA H1047R in culture (PMID: 21325073, PMID: 17314276). 17314276 21325073
ERBB2 amp PIK3CA E545K PIK3CA K567R Her2-receptor positive breast cancer sensitive Gedatolisib Preclinical - Cell line xenograft Actionable In a preclinical study, Gedatolisib (PKI-587) inhibited PI3K signaling, cell growth and induced apoptosis in human breast cancer cells harboring ERBB2 (HER2) amplification, PIK3CA E545K, and PIK3CA K567R in culture and in cell line xenografts (PMID: 21325073, PMID: 17314276). 17314276 21325073
NRAS Q61K lung non-small cell carcinoma decreased response Gedatolisib Preclinical Actionable In a preclinical study, human non-small cell lung cancer cells harboring NRAS Q61K had a decreased response to Gedatolisib (PKI-587) in culture (PMID: 21325073, PMID: 12068308). 21325073 12068308
Unknown unknown breast cancer not applicable Gedatolisib Preclinical - Cell line xenograft Actionable In a preclinical study, Gedatolisib (PF-05212384) suppressed phosphorylation of PI3K/mTOR effectors and induced apoptosis in human breast cancer cell lines with elevated PI3K/mTOR signaling in culture and in cell line xenograft models (PMID: 21325073). 21325073
PIK3CA E545K breast cancer sensitive Gedatolisib Preclinical Actionable In a preclinical study, Gedatolisib (PKI-587) inhibited growth of human breast cancer cells harboring PIK3CA E545K in culture (PMID: 21325073, PMID: 17314276). 17314276 21325073
BRAF V600E colon cancer sensitive Gedatolisib Preclinical Actionable In a preclinical study, Gedatolisib (PKI-587) inhibited Braf V600E in vitro and inhibited growth of human colon cancer cells harboring BRAF V600E in culture (PMID: 21325073, PMID: 24042735). 24042735 21325073
PIK3CA H1047R breast cancer sensitive Gedatolisib Preclinical Actionable In a preclinical study, Gedatolisib (PKI-587) inhibited growth of human breast cancer cells harboring PIK3CA H1047R in culture (PMID: 21325073, PMID: 17314276). 17314276 21325073
STK11 mutant lung non-small cell carcinoma sensitive Gedatolisib Preclinical Actionable In a preclinical study, Gedatolisib (PF-05212384) inhibited growth of human non-small cell lung carcinoma cells harboring an STK11 mutation in culture (PMID: 21325073). 21325073