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• W2100090122 abstract "Cross-resistance to molecules used in endocrine therapy is among the main challenges in the treatment of estrogen receptor-α (ERα) positive breast cancer. In this study, we used two different cell models of resistance to anti-estrogens: MVLN/CL6.7 cells and VP229/VP267 cells selected after exposure to tamoxifen respectively in vitro and in vivo to characterize a phenotype rarely observed, i.e. acquisition of cross-resistance to the pure ER antagonist fulvestrant. As MVLN/CL6.7 cells and VP229/VP267 cell lines are original and valuable models of cross-resistance to tamoxifen and fulvestrant, we examined candidate genes using a RTQ-PCR strategy to identify new biomarkers of endocrine resistance. Out of the 26 candidate genes tested, 19 displayed deregulation of expression at the basal level in at least one of the two resistant cell lines. Eight genes ( TACC1 , NOV , PTTG1 , MAD2L1 , BAK1 , TGFB2 , BIRC5 , and CCNE2 ) were significantly overexpressed in samples from ER-positive breast cancer patients who relapsed after tamoxifen treatment ( n =24) compared with samples from patients who did not ( n =24). Five genes ( TACC1 , NOV , PTTG1 , BAK1 , and TGFB2 ) were correlated with significantly shorter relapse-free survival (univariate analysis). Finally, we identified TACC1 and a three-gene expression signature ( TACC1 , NOV , and PTTG1 ) as independent prognostic markers (multivariate analysis). Aberrant mRNA and protein levels of TACC1, NOV, and PTTG1 were also observed under tamoxifen and/or fulvestrant exposure in resistant CL6.7 cells compared with their respective control MVLN cells. In conclusion, our data identify TACC1 , NOV , and PTTG1 as promising new markers that could be used in the clinical management of ER-positive breast cancer patients." @default.
• W2100090122 created "2016-06-24" @default.
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• W2100090122 date "2008-11-03" @default.
• W2100090122 modified "2023-10-15" @default.
• W2100090122 title "Identification of TACC1, NOV, and PTTG1 as new candidate genes associated with endocrine therapy resistance in breast cancer" @default.
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• W2100090122 doi "https://doi.org/10.1677/jme-08-0076" @default.
• W2100090122 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18984771" @default.
• W2100090122 hasPublicationYear "2008" @default.
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