Physical basis of the 'magnification rule' for standardized Immunohistochemical scoring of HER2 in breast and gastric cancer

Andreas H. Scheel, Frédérique Penault-Llorca, Wedad Hanna, Gustavo Baretton, Peter Middel, Judith Burchhardt, Manfred Hofmann, Bharat Jasani, Josef Rüschoff

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2 Citations (Scopus)

Abstract

Background: Detection of HER2/neu receptor overexpression and/or amplification is a prerequisite for efficient anti-HER2 treatment of breast and gastric carcinomas. Immunohistochemistry (IHC) of the HER2 protein is the most common screening test, thus precise and reproducible IHC-scoring is of utmost importance. Interobserver variance still is a problem; in particular in gastric carcinomas the reliable differentiation of IHC scores 2+ and 1+ is challenging. Herein we describe the physical basis of what we called the 'magnification rule': Different microscope objectives are employed to reproducibly subdivide the continuous spectrum of IHC staining intensities into distinct categories (1+, 2+, 3+). Methods: HER2-IHC was performed on 120 breast cancer biopsy specimens (n =40 per category). Width and color-intensity of membranous DAB chromogen precipitates were measured by whole-slide scanning and digital morphometry. Image-analysis data were related to semi-quantitative manual scoring according to the magnification rule and to the optical properties of the employed microscope objectives. Results: The semi-quantitative manual HER2-IHC scores are correlated to color-intensity measured by image-analysis and to the width of DAB-precipitates. The mean widths ±standard deviations of precipitates were: IHC-score 1+, 0.64±0.1 μm; score 2+, 1.0±0.23 μm; score 3+, 2.14±0.4 μm. The width of precipitates per category matched the optical resolution of the employed microscope objective lenses: Approximately 0.4 μm (40×), 1.0 μm (10×) and 2.0 μm (5×). Conclusions: Perceived intensity, width of the DAB chromogen precipitate, and absolute color-intensity determined by image-analysis are linked. These interrelations form the physical basis of the 'magnification rule': 2+ precipitates are too narrow to be observed with 5× microscope objectives, 1+ precipitates are too narrow for 10× objectives. Thus, the rule uses the optical resolution windows of standard diagnostic microscope objectives to derive the width of the DAB-precipitates. The width is in turn correlated with color-intensity. Hereby, the more or less subjective estimation of IHC scores based only on the staining-intensity is replaced by a quasi-morphometric measurement. The principle seems universally applicable to immunohistochemical stainings of membrane-bound biomarkers that require an intensity-dependent scoring.

Original languageEnglish
Article number19
JournalDiagnostic Pathology
Volume13
Issue number1
DOIs
Publication statusPublished - Mar 12 2018

Keywords

  • Breast cancer
  • Gastric cancer
  • HER2/neu
  • Immunohistochemistry
  • Magnification rule
  • Predictive biomarker

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Histology

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    Scheel, A. H., Penault-Llorca, F., Hanna, W., Baretton, G., Middel, P., Burchhardt, J., Hofmann, M., Jasani, B., & Rüschoff, J. (2018). Physical basis of the 'magnification rule' for standardized Immunohistochemical scoring of HER2 in breast and gastric cancer. Diagnostic Pathology, 13(1), [19]. https://doi.org/10.1186/s13000-018-0696-x