Immunohistochemical testing of GISTs using CD117 markers: the UK NEQAS ICC & ISH external quality assessment data show significant differences in the performance of methods in regular use - Summary - MDSpire

Immunohistochemical testing of GISTs using CD117 markers: the UK NEQAS ICC & ISH external quality assessment data show significant differences in the performance of methods in regular use

  • By

  • Andrew Dodson

  • Suzanne Parry

  • July 17, 2026

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Objective:

To analyze the quality of CD117 immunohistochemistry testing in GISTs through the UK NEQAS ICC & ISH EQA program.

Approach:
  • Data Collection: Archived data from 20 runs of the EQA program conducted between May 2020 and May 2025 was analyzed.
  • Quality Assessment: Participants submitted stained slides for evaluation, which were scored by four expert assessors based on a qualitative scoring system.
Key Findings:
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Interpretation:

The majority of laboratories demonstrated high-quality CD117 overexpression in GISTs, with specific antibodies yielding better results.

Limitations:
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Conclusion:

The study highlights the importance of using specific primary antibodies for optimal staining quality in GIST diagnosis.

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