Reference Detail

Ref Type Journal Article
PMID (20664172)
Authors Di Nicolantonio F, Arena S, Tabernero J, Grosso S, Molinari F, Macarulla T, Russo M, Cancelliere C, Zecchin D, Mazzucchelli L, Sasazuki T, Shirasawa S, Geuna M, Frattini M, Baselga J, Gallicchio M, Biffo S, Bardelli A
Title Deregulation of the PI3K and KRAS signaling pathways in human cancer cells determines their response to everolimus.
Journal The Journal of clinical investigation
Vol 120
Issue 8
Date 2010 Aug
URL
Abstract Text Personalized cancer medicine is based on the concept that targeted therapies are effective on subsets of patients whose tumors carry specific molecular alterations. Several mammalian target of rapamycin (mTOR) inhibitors are in preclinical or clinical trials for cancers, but the molecular basis of sensitivity or resistance to these inhibitors among patients is largely unknown. Here we have identified oncogenic variants of phosphoinositide-3-kinase, catalytic, alpha polypeptide (PIK3CA) and KRAS as determinants of response to the mTOR inhibitor everolimus. Human cancer cells carrying alterations in the PI3K pathway were responsive to everolimus, both in vitro and in vivo, except when KRAS mutations occurred concomitantly or were exogenously introduced. In human cancer cells with mutations in both PIK3CA and KRAS, genetic ablation of mutant KRAS reinstated response to the drug. Consistent with these data, PIK3CA mutant cells, but not KRAS mutant cells, displayed everolimus-sensitive translation. Importantly, in a cohort of metastatic cancer patients, the presence of oncogenic KRAS mutations was associated with lack of benefit after everolimus therapy. Thus, our results demonstrate that alterations in the KRAS and PIK3CA genes may represent biomarkers to optimize treatment of patients with mTOR inhibitors.

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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
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
KRAS mutant Advanced Solid Tumor resistant Everolimus Clinical Study - Cohort Actionable In a clinical study, KRAS mutations were associated with resistance to Afinitor (everolimus) in patients with advanced solid tumors (PMID: 20664172). 20664172
BRAF V600E PTEN loss melanoma predicted - resistant Everolimus Case Reports/Case Series Actionable In a retrospective analysis, a melanoma patient harboring PTEN loss and BRAF V600E demonstrated resistance to Afinitor (everolimus) treatment, resulting in progressive disease (PMID: 20664172). 20664172