Loss of H3K27me3 in WHO grade 3 meningioma

Andrea Daniela Maier*, Christian Beltoft Brøchner, Christian Mirian, Jeppe Haslund-Vinding, Jiri Bartek, Tomas J Ekström, Frantz Rom Poulsen, David Scheie, Tiit Mathiesen

*Corresponding author for this work

Abstract

Immunohistochemical quantification of H3K27me3 was reported to distinguish meningioma patients with an unfavorable prognosis but is not yet established as a prognostic biomarker within WHO grade 3 meningiomas. We studied H3K27me3 loss in a series of biopsies from primary and secondary malignant meningioma to validate its prognostic performance and describe if loss of H3K27me3 occurs during malignant transformation. Two observers quantified H3K27me3 status as "complete loss", < 50% and > 50% stained cells in 110 tumor samples from a population-based consecutive cohort of 40 WHO grade 3 meningioma patients. We found no difference in overall survival (OS) in patients with > 50% H3K27me3 retention compared to < 50% in the cohort of patients with WHO grade 3 meningioma (Wald test p = 0.5). H3K27me3 staining showed heterogeneity in full section tumor slides while staining of the Barr body and peri-necrotic cells complicated quantification further. H3K27me3 expression differed without a discernible pattern between biopsies from repeated surgeries of meningioma recurrences. In conclusion, our results were not compatible with a systematic pattern of immunohistochemical H3K27me3 loss being associated with OS or malignant transformation of meningiomas and did not support H3K27me3 loss as a useful immunohistochemical biomarker within grade 3 meningiomas due to staining-specific challenges in quantification.

Original languageEnglish
JournalBrain tumor pathology
Volume39
Issue number4
Pages (from-to)200-209
Number of pages10
ISSN1433-7398
DOIs
Publication statusPublished - Oct 2022

Keywords

  • Child
  • Histones/genetics
  • Humans
  • Meningeal Neoplasms/pathology
  • Meningioma/pathology
  • Prognosis
  • World Health Organization

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