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Role of transforming growth factor beta in breast carcinogenesis

John R Benson1

  • 1Cambridge Breast Unit, Addenbrooke's Hospital, Cambridge, UK. john.benson@addenbrookes.nhs.uk

The Lancet. Oncology
|March 31, 2004
PubMed

Insights

Transforming growth factor (TGF) beta acts as a tumor suppressor early in breast cancer. Later, TGF-beta may paradoxically promote tumor growth, suggesting stage-specific therapeutic strategies.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Transforming growth factor (TGF) beta is a key negative regulator of epithelial cell proliferation.
  • Its antiproliferative effects suggest potential as a tumor suppressor in early breast carcinogenesis.
  • Maintaining TGF-beta signaling is crucial for the initial growth-inhibitory response.

Purpose of the Study:

  • To review the complex and evolving roles of TGF-beta in breast tumor development.
  • To discuss competing therapeutic strategies targeting TGF-beta signaling.
  • To explore the concept of functional pleiotropy in cancer progression.

Main Methods:

  • Literature review of studies on TGF-beta in breast carcinogenesis.
  • Analysis of TGF-beta signaling pathways and their alterations during tumor evolution.
  • Discussion of therapeutic interventions targeting TGF-beta.

Main Results:

  • Early breast cancer exhibits a growth-inhibitory response to TGF-beta, dependent on intact signaling.
  • Tumor progression is associated with a loss of this inhibitory response.
  • TGF-beta may promote tumor growth indirectly in later stages by affecting stroma, angiogenesis, and immunity.

Conclusions:

  • TGF-beta's role shifts from tumor suppressor to potential tumor promoter during breast cancer progression.
  • Therapeutic strategies should be stage-specific: boosting TGF-beta in early disease and inhibiting it in metastatic states.
  • Understanding TGF-beta's pleiotropy is critical for effective cancer therapy.

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