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A Next-generation Tissue Microarray ngTMA Protocol for Biomarker Studies
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Tissue microarray validation in cervical carcinoma studies. A methodological approach.

Lucília Lovane1,2,3, Carla Carrilho2,3, Christina Karlsson4

  • 1School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden. Lucilia.Matias@oru.se.

Histology and Histopathology
|August 1, 2024
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Summary
This summary is machine-generated.

Tissue microarrays (TMAs) can accurately represent whole slide images (WSs) for cervical cancer biomarker research. Three 0.6 mm cores are sufficient for reliable analysis, validating TMA cost-effectiveness.

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Area of Science:

  • Oncology
  • Pathology
  • Biomarker Research

Background:

  • Cervical cancer (CC) is a prevalent women's cancer, particularly in low-resource settings, often linked to human papillomavirus.
  • Biomarkers are crucial for CC diagnosis, treatment, and prognosis.
  • Tissue microarrays (TMAs) offer a cost-effective method for biomarker studies in clinical research.

Purpose of the Study:

  • To evaluate and validate the effectiveness of TMAs in cervical cancer research compared to whole slide images (WSs).
  • To determine the optimal number of TMA cores for accurate biomarker representation.
  • To establish a generalized approach for TMA sampling in diverse research contexts.

Main Methods:

  • Selected and anonymized twenty cervical cancer cases.
  • Investigated expression of p16, cytokeratin 5 (CK5), cytokeratin 7 (CK7), programmed death-ligand 1 (PD-L1), and CD8 via immunohistochemistry.
  • Scanned whole slide images (WSs) and created virtual TMA cores (0.6 mm diameter).
  • Assessed ten random combinations of 1-5 cylinders per case for each biomarker.
  • Evaluated scoring agreement between TMA and WS using kappa statistics.

Main Results:

  • Three 0.6 mm TMA cores accurately represent WS findings in this cervical cancer cohort.
  • Kappa values for agreement between TMA and WS ranged from 1 (p16) to 0.61 (PD-L1).
  • Demonstrated the reliability of TMA for assessing multiple biomarkers in cervical cancer.

Conclusions:

  • Tissue microarrays (TMAs) are a validated and effective tool for cervical cancer biomarker research, offering a cost-effective alternative to whole slide images.
  • A sampling strategy using three 0.6 mm cores per case provides reliable representation of biomarker expression.
  • The proposed TMA sampling approach is generalizable to various tissues and biomarkers, enhancing the efficiency of clinical research.