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Palbociclib-The First of a New Class of Cell Cycle Inhibitors

Marcus Schmidt1, Martin Sebastian2

  • 1Department of Obstetrics and Gynecology, University Medical Center Mainz, Langenbeckstr. 1, 55131, Mainz, Germany. marcus.schmidt@unimedizin-mainz.de.

Recent Results in Cancer Research. Fortschritte Der Krebsforschung. Progres Dans Les Recherches Sur Le Cancer
|August 3, 2018
PubMed

Insights

Palbociclib, a cyclin-dependent kinase (CDK) 4/6 inhibitor, significantly improves progression-free survival in advanced ER-positive/HER2-negative breast cancer when combined with endocrine therapy. This treatment is well-tolerated, with manageable side effects like neutropenia.

Area of Science:

  • Oncology
  • Pharmacology
  • Cell Biology

Background:

  • Cyclin-dependent kinases (CDKs) regulate cell cycle progression, with CDK4/6 being crucial for the G1-S phase transition.
  • Dysregulation of cell cycle control is a hallmark of cancer, making CDK inhibitors a target for cancer therapy.

Purpose of the Study:

  • To evaluate the efficacy and safety of palbociclib, an oral CDK4/6 inhibitor, in combination with endocrine therapy for advanced ER-positive/HER2-negative breast cancer.
  • To assess the impact of palbociclib on progression-free survival (PFS) and overall quality of life (QoL).

Main Methods:

  • Clinical trials (PALOMA-2 and PALOMA-3) involving patients with advanced ER-positive/HER2-negative breast cancer.
  • Palbociclib administered orally in combination with letrozole (first-line) or fulvestrant (endocrine pretreated).

Main Results:

  • Palbociclib significantly prolonged PFS compared to placebo in both first-line (24.8 vs. 14.5 months) and endocrine-pretreated (9.2 vs. 3.8 months) settings.
  • The primary toxicity observed was neutropenia, which was manageable through dose adjustments, leading to a favorable safety profile and delayed QoL deterioration.

Conclusions:

  • Palbociclib in combination with endocrine therapy is an effective and well-tolerated treatment for advanced ER-positive/HER2-negative breast cancer.
  • Further research is ongoing to explore palbociclib's role in early-stage breast cancer and other cancer types, with a need for predictive biomarkers.
Keywords:
AdvancedBreast cancerEndocrineMetastaticPalbocilib

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