Reference Detail

Ref Type Journal Article
PMID (27974663)
Authors Anderson GR, Wardell SE, Cakir M, Crawford L, Leeds JC, Nussbaum DP, Shankar PS, Soderquist RS, Stein EM, Tingley JP, Winter PS, Zieser-Misenheimer EK, Alley HM, Yllanes A, Haney V, Blackwell KL, McCall SJ, McDonnell DP, Wood KC
Title PIK3CA mutations enable targeting of a breast tumor dependency through mTOR-mediated MCL-1 translation.
Journal Science translational medicine
Vol 8
Issue 369
Date 2016 Dec 14
URL
Abstract Text Therapies that efficiently induce apoptosis are likely to be required for durable clinical responses in patients with solid tumors. Using a pharmacological screening approach, we discovered that combined inhibition of B cell lymphoma-extra large (BCL-XL) and the mammalian target of rapamycin (mTOR)/4E-BP axis results in selective and synergistic induction of apoptosis in cellular and animal models of PIK3CA mutant breast cancers, including triple-negative tumors. Mechanistically, inhibition of mTOR/4E-BP suppresses myeloid cell leukemia-1 (MCL-1) protein translation only in PIK3CA mutant tumors, creating a synthetic dependence on BCL-XL This dual dependence on BCL-XL and MCL-1, but not on BCL-2, appears to be a fundamental property of diverse breast cancer cell lines, xenografts, and patient-derived tumors that is independent of the molecular subtype or PIK3CA mutational status. Furthermore, this dependence distinguishes breast cancers from normal breast epithelial cells, which are neither primed for apoptosis nor dependent on BCL-XL/MCL-1, suggesting a potential therapeutic window. By tilting the balance of pro- to antiapoptotic signals in the mitochondria, dual inhibition of MCL-1 and BCL-XL also sensitizes breast cancer cells to standard-of-care cytotoxic and targeted chemotherapies. Together, these results suggest that patients with PIK3CA mutant breast cancers may benefit from combined treatment with inhibitors of BCL-XL and the mTOR/4E-BP axis, whereas alternative methods of inhibiting MCL-1 and BCL-XL may be effective in tumors lacking PIK3CA mutations.

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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
BRAF act mut colorectal cancer predicted - sensitive VX-11e + WEHI-539 Preclinical - Cell culture Actionable In a preclinical study, inhibition of Erk signaling by VX-11e sensitized colorectal cancer cell lines harboring KRAS or BRAF activating mutations to WEHI-539 in culture (PMID: 27974663). 27974663
KRAS act mut colorectal cancer no benefit Venetoclax + VX-11e Preclinical - Cell culture Actionable In a preclinical study, inhibition of Erk signaling by VX-11e did not sensitize colorectal cancer cell lines harboring KRAS or BRAF activating mutations to Venclexta (venetoclax) in culture (PMID: 27974663). 27974663
Unknown unknown Advanced Solid Tumor not applicable Navitoclax Preclinical - Cell culture Actionable In a preclinical study, Navitoclax (ABT-263) treatment alone was not effective in a number of cell lines derived from solid tumors in culture (PMID: 27974663). 27974663
KRAS act mut colorectal cancer predicted - sensitive VX-11e + WEHI-539 Preclinical - Cell culture Actionable In a preclinical study, inhibition of Erk signaling by VX-11e sensitized colorectal cancer cell lines harboring KRAS or BRAF activating mutations to WEHI-539 in culture (PMID: 27974663). 27974663
BRAF act mut colorectal cancer no benefit Venetoclax + VX-11e Preclinical - Cell culture Actionable In a preclinical study, inhibition of Erk signaling by VX-11e did not sensitize colorectal cancer cell lines harboring KRAS or BRAF activating mutations to Venclexta (venetoclax) in culture (PMID: 27974663). 27974663