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Improving precise counting of mitotic cells in mantle cell lymphoma using phosphohistone H3 (PHH3) antibody

Authors :
Mohamed Elshiekh
Kikkeri N. Naresh
Hanine Medani
Source :
Journal of clinical pathology. 74(10)
Publication Year :
2020

Abstract

AimsMantle cell lymphoma (MCL) has a highly heterogeneous clinical course ranging from indolent, to aggressive and rapidly progressive disease. Proliferation is a strong predictor for disease outcome. In routine clinical practice, Ki-67 expression is used as a measure of proliferation. However, several studies have documented a high degree of inter-laboratory and inter-observer variation with Ki-67 immunohistochemistry. Phosphorylation of histone H3 occurs specifically during mitosis and hence serves as a specific marker for cells in mitosis.Methods and resultsWe investigated phosphohistone H3 (PHH3) immunohistochemistry as a proliferation maker in 28 tissue biopsies of MCL and compared the PHH3 results (as evaluated by direct microscopic visualisation and image analysis-aided scoring) with morphological subtyping, mitotic counts and Ki-67 index. We found PHH3-mitotic count was about sixfold higher than H&E-mitotic count (mitoses in 10 high power fields). Furthermore, PHH3-mitotic count in aggressive morphological variants of MCL was significantly higher than in usual MCL. The PHH3-mitotic count showed a strong linear correlation with PHH3-mitotic index (percentage positive cells).ConclusionsWe found PHH3 immunohistochemistry, a reliable mitosis-specific marker, in MCL. Performing precise counts and evaluating precise proliferation indices is easier with PHH3 immunohistochemistry. This contrasts with the conventional estimation of Ki-67 percentages by ‘eye-balling’.

Details

ISSN :
14724146
Volume :
74
Issue :
10
Database :
OpenAIRE
Journal :
Journal of clinical pathology
Accession number :
edsair.doi.dedup.....3b6d4864eb13e3024d118a96335b0c1e