Aurelio B Castrellon, Steven M Nguyen and Luis E Raez
Endocrine therapy (ET) is the usual first-line therapy for patients with hormone receptor-positive metastatic breast cancer (HR+MBC). However, resistance to ET frequently occurs during the course of treatment. Cellular pathways involved in cell proliferation are targets for new drugs that interfere with development of resistance to ET. Cyclin-dependent kinases (CDKs) are a subgroup of serine/ threonine kinases that play a key role in regulating cell cycle progression. In this review, we discuss the currently approved and under investigation CDK 4/6 inhibitors, in addition to their preclinical data and clinical trials that demonstrated their benefit in the treatment of HR+ breast cancer.
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