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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Published on: September 18, 2020

RASSF1A gene promoter methylation in esophageal cancer specimens

S Yamaguchi1, H Kato, T Miyazaki

  • 1Department of General Surgical Science, Gunma University Graduate School, Graduate School of Medicine, Maebashi, Gunma, Japan.

Diseases of the Esophagus : Official Journal of the International Society for Diseases of the Esophagus
|September 1, 2005
PubMed

Insights

RASSF1A gene promoter methylation inactivates this tumor suppressor in 24% of esophageal squamous cell cancer (ESCC) cases. This epigenetic change correlates with tumor de-differentiation but not prognosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Epigenetics

Background:

  • The RASSF1A gene acts as a tumor suppressor and is frequently inactivated by promoter methylation in various human cancers.
  • Understanding the role of RASSF1A in esophageal squamous cell cancer (ESCC) is crucial for identifying potential therapeutic targets and diagnostic markers.

Purpose of the Study:

  • To investigate the frequency of RASSF1A gene promoter methylation in primary ESCC.
  • To determine the clinicopathological significance and prognostic value of RASSF1A methylation in ESCC.

Main Methods:

  • Methylation-specific polymerase chain reaction (MSP) was employed to detect RASSF1A gene methylation.
  • DNA from 55 primary ESCC cases was analyzed for RASSF1A promoter methylation status.

Main Results:

  • RASSF1A gene promoter methylation was detected in 13 out of 55 (24%) primary ESCC cases.
  • No significant association was found between RASSF1A methylation and patient age, gender, tumor localization, invasion depth, or tumor stage.
  • A significant association was observed between RASSF1A promoter methylation and poor tumor differentiation.

Conclusions:

  • RASSF1A gene inactivation via promoter methylation is a common epigenetic event in ESCC.
  • RASSF1A methylation is associated with tumor de-differentiation in ESCC, suggesting a role in cancer progression.
  • RASSF1A methylation status does not appear to correlate with the prognosis of ESCC patients.

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