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Preserved Smad4 expression in the transforming growth factor beta signaling pathway is a favorable prognostic factor

C Xiangming1, S Natsugoe, S Takao

  • 1First Department of Surgery, School of Medicine, Kagoshima University, Japan.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|March 10, 2001
PubMed

Insights

Reduced Smad4 expression is linked to poorer outcomes in advanced gastric cancer patients. However, preserved Smad4 expression in TGF-beta1-positive tumors indicates a better prognosis, highlighting Smad4

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Transforming growth factor beta (TGF-beta) superfamily signals are crucial for cellular processes.
  • Smad proteins act as intracellular mediators, translocating to the nucleus to regulate gene expression.
  • The prognostic role of Smad4 and TGF-beta1 in advanced gastric cancer requires further investigation.

Purpose of the Study:

  • To analyze the expression of Smad4 and TGF-beta1 in advanced gastric cancer.
  • To determine the prognostic significance of Smad4 and TGF-beta1 expression in this patient cohort.

Main Methods:

  • Immunohistochemical staining was performed on 249 advanced gastric cancer tissue samples.
  • Antibodies against Smad4 and TGF-beta1 were utilized to assess protein expression levels.
  • Correlation analysis and survival analysis were conducted to evaluate prognostic significance.

Main Results:

  • Reduced Smad4 expression was observed in 75.1% of gastric cancer cases.
  • TGF-beta1 expression was positive in 39.6% of cases and correlated with tumor gross type.
  • Reduced Smad4 expression was associated with deeper tumor invasion and poorer patient survival.
  • In TGF-beta1-positive tumors, preserved Smad4 expression correlated with significantly better survival rates.
  • Multivariate analysis identified Smad4 expression as an independent prognostic factor.

Conclusions:

  • Smad4 expression is a significant independent predictor of clinical outcome in advanced gastric cancer.
  • The interplay between Smad4 and TGF-beta1 signaling pathways offers valuable prognostic information.
  • Targeting the TGF-beta/Smad pathway may hold therapeutic potential for advanced gastric cancer.

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