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Epiplakin expression dynamics during colon carcinogenesis: Correlation with proliferation.

Damla Gül Fındık1, Erhan Şahin1, Özlem Türelik2

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Epiplakin expression is reduced in colon adenocarcinomas and high-risk adenomas, correlating with increased cell proliferation. This suggests epiplakin may serve as a potential biomarker for colorectal cancer progression.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Colorectal cancer (CRC) is a major global health concern, with many cases originating from colon adenomas.
  • Understanding molecular alterations in colon carcinogenesis is vital for improved CRC diagnosis and prognosis.
  • Epiplakin's role in cancer is less understood compared to other plakin proteins, necessitating investigation into its expression and correlation with disease progression.

Purpose of the Study:

  • To investigate the expression patterns of epiplakin in different stages of colorectal neoplasia.
  • To evaluate the correlation between epiplakin expression and the proliferation index (Ki67) in colon tissues.
  • To assess the potential of epiplakin as a diagnostic or prognostic marker for colorectal cancer.

Main Methods:

  • Analysis of 60 tissue samples: colon adenocarcinomas, tubular adenomas, tubulovillous adenomas, and normal colon tissues.
  • Histological reevaluation for classification and grading.
  • Immunohistochemistry to detect epiplakin and Ki67 expression.
  • ImageJ software for quantifying epiplakin optical density and Ki67 proliferation index.
  • Statistical analysis to determine correlations and significance.

Main Results:

  • Epiplakin expression was significantly lower in colon adenocarcinomas and tubulovillous adenomas compared to normal colon tissues and tubular adenomas (P < 0.05).
  • Adenoma groups showed significantly higher Ki67 proliferation indices (P < 0.05).
  • A positive correlation was observed between epiplakin expression levels and the Ki67 proliferation index (r = 0.317, P < 0.05).

Conclusions:

  • Decreased epiplakin expression is associated with the progression of colon malignancy.
  • Epiplakin may play a role in colon carcinogenesis.
  • Epiplakin shows potential as a biomarker for colorectal cancer diagnosis and prognosis.