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- W2079669427 abstract "Abstract Tamoxifen is one of the most widely used endocrine agents for the treatment of estrogen receptor α (ERα)–positive breast cancer. Although effective in most patients, resistance to tamoxifen is a clinically significant problem and the mechanisms responsible remain elusive. To address this problem, we performed a large scale loss-of-function genetic screen in ZR-75-1 luminal breast cancer cells to identify candidate resistance genes. In this manner, we found that loss of function in the deubiquitinase USP9X prevented proliferation arrest by tamoxifen, but not by the ER downregulator fulvestrant. RNAi-mediated attenuation of USP9X was sufficient to stabilize ERα on chromatin in the presence of tamoxifen, causing a global tamoxifen-driven activation of ERα-responsive genes. Using a gene signature defined by their differential expression after USP9X attenuation in the presence of tamoxifen, we were able to define patients with ERα-positive breast cancer experiencing a poor outcome after adjuvant treatment with tamoxifen. The signature was specific in its lack of correlation with survival in patients with breast cancer who did not receive endocrine therapy. Overall, our findings identify a gene signature as a candidate biomarker of response to tamoxifen in breast cancer. Cancer Res; 74(14); 3810–20. ©2014 AACR." @default.
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- W2079669427 date "2014-07-14" @default.
- W2079669427 modified "2023-10-16" @default.
- W2079669427 title "USP9X Downregulation Renders Breast Cancer Cells Resistant to Tamoxifen" @default.
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- W2079669427 doi "https://doi.org/10.1158/0008-5472.can-13-1960" @default.
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