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Microdissection of stained archival tissue

S K Gupta¹, A G Douglas-Jones, J M Morgan

¹Department of Pathology, University of Wales College of Medicine, Cardiff, Wales.

Molecular Pathology : MP

|August 1, 1997

Summary

This study introduces a simple, low-cost Sellotape method for microdissection of preinvasive neoplastic tissue. This technique enables contamination-free DNA extraction for genetic studies, crucial for understanding early cancer development.

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Area of Science:

Oncology
Molecular Biology
Histopathology

Background:

Preinvasive neoplastic progression, identified as dysplasia or in situ disease, is crucial for understanding cancer development.
Molecular events in early neoplasia require pure tissue samples for accurate genetic analysis.
Current methods for isolating preinvasive neoplastic tissue can be complex and prone to contamination.

Purpose of the Study:

To develop and validate a novel, cost-effective microdissection technique for isolating histologically recognizable preinvasive neoplastic tissue.
To ensure the isolated tissue is uncontaminated by inflammatory or stromal cells for downstream genetic analysis.
To assess the compatibility of the microdissection method with DNA extraction and polymerase chain reaction (PCR) assays.

Main Methods:

A novel microdissection technique using 10-micron tissue sections.
Sections are dewaxed, stained with hematoxylin and eosin, dried, and covered with adhesive tape (Sellotape).
Tissue is precisely cut using a scalpel blade under direct visual control, followed by DNA extraction and PCR.

Main Results:

The Sellotape-based microdissection method is quick and eliminates operator tremor.
Tissue architecture is preserved, allowing for photographic documentation.
The presence of Sellotape and adhesive does not inhibit DNA extraction or PCR amplification.

Conclusions:

This novel Sellotape microdissection method provides a simple, rapid, and effective means to obtain pure preinvasive neoplastic tissue.
The technique is suitable for genetic studies, including DNA extraction and PCR, aiding research into early neoplastic events.
No specialized equipment is required, making this method accessible for various research settings.

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