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Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer
07:50

Genome-Wide Analysis of DNA Methylation in Gastrointestinal Cancer

Published on: September 18, 2020

DNA hypermethylation of TIMP3 gene in invasive breast ductal carcinoma

E L H Lui1, W T Y Loo, L Zhu

  • 1Department of Surgery, University of Hong Kong Medical Center, Queen Mary Hospital, Pokfulam.

Biomedicine & Pharmacotherapy = Biomedecine & Pharmacotherapie
|March 2, 2006
PubMed
Abstract

Insights

Hypermethylation of the TIMP3 gene was observed in 20.81% of invasive breast cancers. This gene silencing may correlate with aggressive tumor features like high grade, lymph node metastasis, and specific receptor overexpressions.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Neoplastic cells exhibit aberrant methylation, silencing tumor suppressor genes (TSGs) crucial for cell cycle control, DNA repair, and angiogenesis.
  • Tissue inhibitor of metalloproteinase-3 (TIMP3) is an extracellular matrix protein influencing tumor growth, invasion, and angiogenesis by mediating vascular endothelial growth factor (VEGF) signaling.
  • Aberrant methylation of TIMP3 can disrupt its regulatory functions in cancer development.

Purpose of the Study:

  • To investigate the hypermethylation status of the TIMP3 gene in invasive breast ductal carcinoma (IDC).
  • To correlate TIMP3 gene hypermethylation with key clinical and pathological parameters in breast cancer patients.

Main Methods:

  • DNA extraction and methylation-specific PCR (MSP) were performed on 173 invasive breast carcinoma samples.
  • Methylated and unmethylated primers were used to assess TIMP3 gene methylation.
  • Clinicopathological characteristics were compared with the methylation status of TIMP3.

Main Results:

  • TIMP3 gene hypermethylation was detected in 20.81% of breast cancer samples.
  • Hypermethylated tumors showed associations with higher tumor grade (II-III), lymph node involvement (44.44%), and lymphovascular permeation (36.11%).
  • TIMP3 hypermethylation correlated with overexpression of estrogen receptor (ER) (44.44%), progesterone receptor (PR) (22.22%), and c-erbB2 (47.22%).

Conclusions:

  • Hypermethylation of the TIMP3 gene in IDC is potentially linked to advanced tumor grading and lymph node metastasis.
  • TIMP3 gene hypermethylation may also be associated with the overexpression of ER, PR, and c-erbB2 in breast cancer.
  • These findings suggest TIMP3 methylation as a potential biomarker in breast cancer progression.

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