Mismatch Repair System Gene Expression in FFPE Samples from Breast Cancer Patients

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Cancer development is often linked to gene mutations affecting critical cellular pathways.
• The Mismatch Repair System (MMR) plays a role in identifying and correcting DNA mutations.
• Limited data exists on MMR gene expression in formalin-fixed paraffin-embedded (FFPE) breast cancer samples.

Purpose of the Study:

• To investigate the expression levels of the hMSH2 and hMSH6 genes.
• To analyze gene expression in FFPE breast cancer tumor biopsies.
• To contribute data on MMR gene expression in breast cancer.

Main Methods:

• Quantitative Polymerase Chain Reaction (qPCR) was used for gene expression analysis.
• Tumor samples from 100 breast cancer patients were analyzed.
• Molecular analysis was performed on 89 suitable FFPE samples.

Main Results:

• hMSH2 gene expression was observed in 10 samples (11.23%).
• hMSH6 gene expression was detected in 4 samples (4.5%).
• No correlation was found between hMSH2/hMSH6 expression and tumor stage, HER2, ER, PR, or Ki-67 status.

Conclusions:

• The study suggests a downregulation of hMSH2 and hMSH6 gene expression during breast cancer progression.
• Reduced expression of these MMR genes may be implicated in breast tumorigenesis.
• Further research is warranted to explore the functional impact of decreased MMR gene expression in breast cancer.