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01-04-2018 | Review

Potential biomarkers of CDK4/6 inhibitors in hormone receptor-positive advanced breast cancer

Published in: Breast Cancer Research and Treatment | Issue 2/2018

Abstract

Purpose

Cyclin D/cyclin-dependent kinase 4/6 (CDK4/6) complex inhibitors have recently been proven effective when combined with endocrine therapy in clinical trials. However, the clinical benefit from CDK4/6 inhibitor varied from different patients. In order to optimize the clinical application of CDK4/6 inhibitors, this review focuses on the potential biomarkers applicable to identify patients who will benefit the most from CDK4/6 inhibition.

Methods

We have summarized the clinical trials about addition of CDK4/6 inhibitors to endocrine therapy and reviewed literature currently available on the potential biomarkers in predicting efficacy of CDK4/6 inhibitors. The primary objective was to determine the predictors. The secondary objective was to optimize the combination therapeutics for patients with estrogen receptor (ER)-positive breast cancer.

Results

We reviewed clinical trials on antiestrogen agents combined with the CDK4/6 inhibitor (Palbociclib, Ribociclib, or Abemaciclib) in ER-positive breast cancer. It was confirmed that the addition of CDK4/6 inhibitors was associated with an improved efficacy. More importantly, we discussed potential biomarkers for identifying the subpopulations of breast cancer patients who would derive the greatest benefit from CDK4/6 inhibitors.

Conclusions

We have found that although CDK4/6 inhibitors combined with endocrine therapy were potent, the toxicity and financial burden also increased. To maximize the effect of the combinations and select patients that best response to such combinations, further experiments and trials are expected to confirm these molecules as reliable biomarkers.

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Title: Potential biomarkers of CDK4/6 inhibitors in hormone receptor-positive advanced breast cancer
Publication date: 01-04-2018
Published in: Breast Cancer Research and Treatment / Issue 2/2018
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-017-4612-y

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