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Ref Type Journal Article
PMID (24718026)
Authors Höland K, Boller D, Hagel C, Dolski S, Treszl A, Pardo OE, Cwiek P, Salm F, Leni Z, Shepherd PR, Styp-Rekowska B, Djonov V, von Bueren AO, Frei K, Arcaro A
Title Targeting class IA PI3K isoforms selectively impairs cell growth, survival, and migration in glioblastoma.
Journal PloS one
Vol 9
Issue 4
Date 2014
URL
Abstract Text The phosphoinositide 3-kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) pathway is frequently activated in human cancer and plays a crucial role in glioblastoma biology. We were interested in gaining further insight into the potential of targeting PI3K isoforms as a novel anti-tumor approach in glioblastoma. Consistent expression of the PI3K catalytic isoform PI3K p110α was detected in a panel of glioblastoma patient samples. In contrast, PI3K p110β expression was only rarely detected in glioblastoma patient samples. The expression of a module comprising the epidermal growth factor receptor (EGFR)/PI3K p110α/phosphorylated ribosomal S6 protein (p-S6) was correlated with shorter patient survival. Inhibition of PI3K p110α activity impaired the anchorage-dependent growth of glioblastoma cells and induced tumor regression in vivo. Inhibition of PI3K p110α or PI3K p110β also led to impaired anchorage-independent growth, a decreased migratory capacity of glioblastoma cells, and reduced the activation of the Akt/mTOR pathway. These effects were selective, because targeting of PI3K p110δ did not result in a comparable impairment of glioblastoma tumorigenic properties. Together, our data reveal that drugs targeting PI3K p110α can reduce growth in a subset of glioblastoma tumors characterized by the expression of EGFR/PI3K p110α/p-S6.

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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
PIK3CA H1047Y glioblastoma sensitive YM-024 Preclinical Actionable In a preclinical study, glioblastoma cell lines harboring PIK3CA H1047Y demonstrated increased sensitivity to YM-204 induced growth inhibition (PMID: 24718026). 24718026
PIK3CA over exp glioblastoma sensitive YM-024 Preclinical Actionable In a preclinical study, YM-024 inhibited proliferation and anchorage-independent growth of glioblastoma cell lines with elevated Pik3ca protein level in culture (PMID: 24718026). 24718026
PIK3CA V344G glioblastoma no benefit YM-024 Preclinical Actionable In a preclinical study, YM-024 did not inhibit proliferation of glioblastoma cell lines harboring PIK3CA V344G in culture (PMID: 24718026). 24718026