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Cell cycle-related gene abnormalities and product expression in esophageal carcinoma

M Roncalli1, S Bosari, A Marchetti

  • 1Department of Pathology, Humanitas Clinical Institute, University, University of Milan School of Medicine, Rozzano, Italy.

Laboratory Investigation; a Journal of Technical Methods and Pathology
|October 6, 1998
PubMed

Insights

Genetic alterations in cyclin D1 and Rb genes are linked to poor survival in esophageal carcinoma. Cyclin D1 amplification specifically indicates squamous cell type, highlighting their clinical significance.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Esophageal carcinoma exhibits genetic alterations in cell cycle regulators.
  • Previous studies identified individual genetic changes in G1-to-S transition genes.

Purpose of the Study:

  • To comprehensively analyze the role and clinical significance of cyclin D1, MTS1, and Rb genes in esophageal carcinoma.
  • To investigate gene amplification, protein accumulation, allelic loss, mutation, and methylation of these critical genes.

Main Methods:

  • Analysis of cyclin D1 gene amplification and protein accumulation.
  • Investigation of Rb gene allelic loss and protein expression.
  • Assessment of MTS1 gene mutation and DNA methylation in 74 esophageal carcinomas.

Main Results:

  • Cyclin D1 amplification (31%) was associated with squamous cell carcinoma and poor survival.
  • Rb gene loss of heterozygosity (36%) correlated with unfavorable survival.
  • MTS1 mutations were rare; methylation (24%) showed no significant correlations.
  • Direct association between cyclin D1 and Rb accumulation; inverse association between Rb loss and MTS1 abnormalities.

Conclusions:

  • Deregulation of cyclin D1 and Rb genes significantly predicts poor survival in esophageal carcinoma.
  • Cyclin D1 amplification is a marker for squamous cell type, absent in adenocarcinomas.
  • Molecular abnormalities within the same pathway appear mutually exclusive in neoplastic progression.

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