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BAP1-deficient meningioma presenting with trabecular architecture and cytokeratin expression: a report of two cases and review of the literature
  1. Alexander P Landry1,
  2. Justin Z Wang1,
  3. Farshad Nassiri1,
  4. Vikas Patil2,
  5. Andrew Gao3,
  6. Gelareh Zadeh1
  1. 1 Division of Neurosurgery, University of Toronto, Toronto, Ontario, Canada
  2. 2 Princess Margaret Hospital, Toronto, Ontario, Canada
  3. 3 Department of Pathology, University Health Network, Toronto, Ontario, Canada
  1. Correspondence to Dr Alexander P Landry, University of Toronto, Toronto, Canada; alex.landry{at}


Aims BRCA (BReast CAncer gene)-associated protein 1 (BAP1), encoded by the BAP1 gene, a tumour suppressor that is lost in several cancers. Importantly, such mutations have been shown to be susceptible to poly (ADP-ribose) polymerase (PARP) inhibition in preclinical studies, offering hope for targeted therapy. While rare, BAP1 loss has been observed in a subset of rhabdoid and papillary meningioma and is associated with earlier recurrence. We seek to add to the literature on this rare disease and advocate for more routine BAP1 testing.

Methods We present a report of two cases of BAP1-deficient meningioma and review the available literature on this rare entity.

Results Both cases present with a distinct trabecular architecture without rhabdoid or papillary features. Interestingly, both also presented with radiographic and histopathological findings unusual for meningioma. While immunohistochemistry and genetic sequencing confirmed BAP1 loss, DNA methylation analysis was required to confirm the final diagnosis.

Conclusions We suggest that BAP1-deficient meningioma should be considered in the differential diagnosis of extra-axial central nervous system (CNS) tumours with atypical imaging or histopathological features and that BAP1 loss may constitute a clinically important meningioma subtype with opportunities for targeted therapy.

  • central nervous system
  • meningioma
  • computers
  • molecular
  • brain neoplasms

Data availability statement

Data sharing not applicable as no datasets generated and/or analysed for this study.

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Data availability statement

Data sharing not applicable as no datasets generated and/or analysed for this study.

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  • Handling editor Runjan Chetty.

  • Contributors APL, JZW, FN and VP collected data; APL conducted literature review and wrote manuscript draft; AG analysed and provided histology slides; APL, JZW and AG provided figures; GZ is the guarantor and supervised all aspects of the project; all authors revised the manuscript and approve its final version.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.