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CDK4-6 inhibitors in breast cancer: current status and future development

Joan Rou-En Choo1, Soo-Chin Lee1,2

  • 1a Department of Haematology-Oncology , National University Cancer Institute, National University Health System (NUHS) , Singapore , Singapore.

Expert Opinion on Drug Metabolism & Toxicology
|October 27, 2018
PubMed
Abstract

Insights

Three CDK4/6 inhibitors (palbociclib, ribociclib, abemaciclib) show similar efficacy for hormone-receptor positive metastatic breast cancer. Differences in toxicity and dosing may guide treatment choices, with biomarker research ongoing.

Area of Science:

  • Oncology
  • Pharmacology
  • Translational Medicine

Background:

  • Dysregulation of the cyclin-dependent kinase (CDK) retinoblastoma (Rb)-pathway drives aberrant cellular proliferation in various cancers.
  • Selective CDK4/6 inhibition is a key therapeutic strategy for hormone-receptor positive (HR+), HER2-negative (HER2-) metastatic breast cancer (MBC).
  • Palbociclib, ribociclib, and abemaciclib are approved CDK4/6 inhibitors for HR+/HER2- MBC treatment.

Purpose of the Study:

  • To compare the pharmacology, clinical efficacy, and toxicity profiles of approved CDK4/6 inhibitors.
  • To discuss challenges in CDK4/6 inhibitor therapy, including biomarker identification, dosing optimization, and combination strategies.
  • To provide an expert opinion on the current landscape and future directions for CDK4/6 inhibitors in HR+/HER2- MBC.

Main Methods:

  • Comprehensive literature review of pharmacology, clinical trials, and toxicity data for palbociclib, ribociclib, and abemaciclib.
  • Comparative analysis of efficacy (progression-free survival) and safety profiles.
  • Discussion of challenges and future research directions based on current evidence.

Main Results:

  • All three CDK4/6 inhibitors demonstrate significant efficacy when combined with endocrine therapy for HR+/HER2- MBC, improving progression-free survival.
  • Clinical efficacy appears comparable across the three agents.
  • Differences in toxicity profiles, dosing schedules, and monitoring requirements exist, potentially influencing clinical selection.

Conclusions:

  • CDK4/6 inhibitors have transformed HR+/HER2- MBC treatment with consistent PFS benefits.
  • Treatment choice may depend on individual drug toxicity, dosing, and patient monitoring.
  • Further research is needed to identify predictive biomarkers and optimize combination therapies for CDK4/6 inhibition.
Keywords:
AbemaciclibCDK4/6 inhibitorsbreast cancercell cycle inhibitorshormone receptor positivepalbociclibribociclib

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