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Optimized expression-based microdissection of formalin-fixed lung cancer tissue.

Markus Grafen1, Thurid R Hofmann2, Andreas H Scheel3

  • 1Applied Laser Technologies, Faculty of Mechanical Engineering, Ruhr-University Bochum, Bochum, Germany.

Laboratory Investigation; a Journal of Technical Methods and Pathology
|April 25, 2017
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Summary

Expression-based microdissection (xMD) effectively isolates lung cancer cells from heterogeneous tissue, improving DNA analysis for targeted treatments. This optimized method enhances accuracy and efficiency in molecular diagnostics.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Precision medicine relies on analyzing specific DNA alterations in tumors for targeted treatments.
  • Lung cancer, a leading cause of cancer death, presents challenges due to cellular heterogeneity in tissue samples.
  • Conventional laser capture microdissection has limitations including cost, time, and user-dependent region selection.

Purpose of the Study:

  • To optimize expression-based microdissection (xMD) for lung cancer tissue analysis.
  • To improve the enrichment of tumor cells and subsequent DNA analysis.
  • To establish a quality control protocol for xMD procedures.

Main Methods:

  • Optimized xMD by enhancing tumor cell-specific immunostaining intensity and sample processing.
  • Utilized whole-slide irradiation triggering localized energy absorption for tumor cell isolation.
  • Developed a quality control protocol using digital whole-slide scanning and image analysis.

Main Results:

  • The optimized xMD procedure successfully enriched mutated epidermal growth factor receptor (EGFR) DNA from lung adenocarcinoma specimens.
  • The method did not compromise DNA quality.
  • The quality control protocol quantified the selectivity and efficiency of xMD.

Conclusions:

  • This study presents an optimized workflow for xMD adapted for lung cancer tissue.
  • The workflow enables efficient lung tumor cell dissection for diagnostic and investigatory analyses.
  • Optimized xMD offers a viable solution for overcoming cellular heterogeneity in tumor DNA analysis.