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Ref Type | Journal Article | ||||||||||||
PMID | (28768804) | ||||||||||||
Authors | Merino D, Whittle JR, Vaillant F, Serrano A, Gong JN, Giner G, Maragno AL, Chanrion M, Schneider E, Pal B, Li X, Dewson G, Gräsel J, Liu K, Lalaoui N, Segal D, Herold MJ, Huang DCS, Smyth GK, Geneste O, Lessene G, Visvader JE, Lindeman GJ | ||||||||||||
Title | Synergistic action of the MCL-1 inhibitor S63845 with current therapies in preclinical models of triple-negative and HER2-amplified breast cancer. | ||||||||||||
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Abstract Text | The development of BH3 mimetics, which antagonize prosurvival proteins of the BCL-2 family, represents a potential breakthrough in cancer therapy. Targeting the prosurvival member MCL-1 has been an area of intense interest because it is frequently deregulated in cancer. In breast cancer, MCL-1 is often amplified, and high expression predicts poor patient outcome. We tested the MCL-1 inhibitor S63845 in breast cancer cell lines and patient-derived xenografts with high expression of MCL-1. S63845 displayed synergistic activity with docetaxel in triple-negative breast cancer and with trastuzumab or lapatinib in HER2-amplified breast cancer. Using S63845-resistant cells combined with CRISPR (clustered regularly interspaced short palindromic repeats)-Cas9 (CRISPR-associated 9) technology, we identified deletion of BAK and up-regulation of prosurvival proteins as potential mechanisms that confer resistance to S63845 in breast cancer. Collectively, our findings provide a strong rationale for the clinical evaluation of MCL-1 inhibitors in breast cancer. |
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