Tissue microarrays: a new approach for quality control in immunohistochemistry

Area of Science:

• Pathology
• Immunohistochemistry
• Biotechnology

Background:

• Immunohistochemistry (IHC) is crucial for disease diagnosis and treatment.
• Accurate interpretation of IHC staining results is essential for reliable diagnostics.
• Quality control in routine IHC can be challenging.

Purpose of the Study:

• To establish and evaluate the utility of a tissue microarray (TMA) technique for improving IHC staining interpretation in a routine setting.
• To assess the TMA technique as a tool for internal quality control in IHC.

Main Methods:

• A TMA was constructed using 600-micrometer tissue cores from routine paraffin-embedded samples.
• TMA blocks contained 12 diverse tissue samples and served as internal positive controls on patient slides.
• The TMA technique was applied to IHC procedures for over 20 different antigens.

Main Results:

• The TMA technique significantly improved the interpretation of IHC staining for numerous antigens.
• The TMA did not adversely affect staining results in conventional or automated IHC platforms.
• This method provided effective internal quality control for routine IHC.

Conclusions:

• Regular use of an institution-adapted TMA is beneficial for internal positive control in IHC.
• The TMA technique enhances the evaluation and reliability of IHC staining results.
• This approach supports diverse laboratory demands and improves diagnostic accuracy.