Title |
Phosphorylated p-70S6K predicts tamoxifen resistance in postmenopausal breast cancer patients randomized between adjuvant tamoxifen versus no systemic treatment
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Published in |
Breast Cancer Research, January 2014
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DOI | 10.1186/bcr3598 |
Pubmed ID | |
Authors |
Karin Beelen, Mark Opdam, Tesa M Severson, Rutger HT Koornstra, Andrew D Vincent, Jelle Wesseling, Jettie J Muris, Els MJJ Berns, Jan B Vermorken, Paul J van Diest, Sabine C Linn |
Abstract |
Activation of the phosphatidylinositol-3-kinase (PI3K) and/or mitogen-activated protein kinase (MAPK) pathways results in anti-estrogen resistance in vitro, but a biomarker with clinical validity to predict intrinsic resistance has not been identified. In metastatic breast cancer patients with previous exposure to endocrine therapy, the addition of a mammalian target of rapamycine (mTOR) inhibitor has been shown to be beneficial. Whether or not patients on adjuvant endocrine treatment might benefit from these drugs is currently unclear. A biomarker that predicts intrinsic resistance could potentially be used as companion diagnostic in this setting. We tested the clinical validity of different downstream-activated proteins in the PI3K and/or MAPK pathways to predict intrinsic tamoxifen resistance in postmenopausal primary breast cancer patients. |
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