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Ref Type Journal Article
PMID (18787170)
Authors Mao JH, Kim IJ, Wu D, Climent J, Kang HC, DelRosario R, Balmain A
Title FBXW7 targets mTOR for degradation and cooperates with PTEN in tumor suppression.
Journal Vol Issue Date Pages Journal Short Title
Science (New York, N.Y.) 321 5895 2008 Sep 12 1499-502 Science
URL
Abstract Text The enzyme mTOR (mammalian target of rapamycin) is a major target for therapeutic intervention to treat many human diseases, including cancer, but very little is known about the processes that control levels of mTOR protein. Here, we show that mTOR is targeted for ubiquitination and consequent degradation by binding to the tumor suppressor protein FBXW7. Human breast cancer cell lines and primary tumors showed a reciprocal relation between loss of FBXW7 and deletion or mutation of PTEN (phosphatase and tensin homolog), which also activates mTOR. Tumor cell lines harboring deletions or mutations in FBXW7 are particularly sensitive to rapamycin treatment, which suggests that loss of FBXW7 may be a biomarker for human cancers susceptible to treatment with inhibitors of the mTOR pathway.

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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
FBXW7 inact mut breast cancer sensitive Sirolimus Preclinical - Cell line xenograft Actionable In a preclinical study, breast cancer cells harboring a FBXW7 mutation demonstrated sensitivity to Rapamune (sirolimus) in culture and in cell line xenograft models (PMID: 18787170). 18787170