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Updated: Jan 20, 2026

Long-term Culture of Human Breast Cancer Specimens and Their Analysis Using Optical Projection Tomography
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Published on: July 29, 2011

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Short- and Long-Term Effects of CDK4/6 Inhibition on Early-Stage Breast Cancer

William B Kietzman1, Garrett T Graham1, Virginie Ory1

  • 1Department of Oncology, Georgetown University, Washington, District of Columbia.

Molecular Cancer Therapeutics
|August 28, 2019
PubMed

Insights

Palbociclib, a CDK4/6 inhibitor, prevents ductal carcinoma in situ progression and inhibits ER(-) invasive breast cancer growth, partly via MUC16. Lasting effects may influence early-stage treatment strategies.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • CDK4/6 inhibitors are established treatments for advanced ER(+) breast cancer.
  • Their role in ER(-) and early-stage breast cancer remains under investigation.

Purpose of the Study:

  • To investigate the efficacy of palbociclib, a CDK4/6 inhibitor, in both ER(-) and ER(+) breast cancer models, including ductal carcinoma in situ (DCIS) and invasive disease.
  • To explore the molecular mechanisms underlying palbociclib's effects, including gene expression changes and the role of MUC16.

Main Methods:

  • Utilized ER(-) (MCFDCIS) and ER(+) (MCF7) breast cancer models in vitro and in vivo.
  • Administered palbociclib and assessed tumor progression, proliferation, and senescence.
  • Performed transcriptomic analysis of tumor and stromal compartments.
  • Investigated the role of MUC16 through gene knockdown experiments.

Main Results:

  • Palbociclib inhibited DCIS progression and invasive disease growth in both ER(-) and ER(+) models.
  • Palbociclib repressed cell cycle genes, induced senescence, and normalized tumorspheres.
  • Transcriptomic analysis revealed repression of cell cycle, senescence genes, and MUC16.
  • MUC16 knockdown inhibited invasive lesion proliferation but not DCIS progression.
  • Post-treatment, differentiation and immune response genes remained suppressed.

Conclusions:

  • Palbociclib prevents DCIS progression and exhibits antiproliferative effects in ER(-) invasive breast cancer, partly mediated by MUC16.
  • Sustained effects on differentiation and immune response after drug withdrawal may impact early-stage ER(-) breast cancer treatment approaches.

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