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Background About 75–80% of breast tumors express the estrogen receptor alpha (ER-α) and are treated with endocrine-target therapeutics, making this the premier therapeutic modality in the breast cancer clinic. However, acquired resistance is common and about 20% of resistant tumors loose ER-α expression via unknown mechanisms. Inhibition of ER-α loss could improve endocrine therapeutic efficacy, benefiting...
Purpose of review The purpose of this review is to describe the role of D-type cyclins and cyclin-dependent kinases (CDKs) 4 and 6 in breast cancer and to discuss potential biomarkers for sensitivity or resistance to CDK4/6 inhibitors. Recent findings A small number of preclinical and clinical studies have explored potential mechanisms of CDK4/6 inhibitor response and resistance in breast cancer...
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