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Clonal origin of recurrent meningiomas

A von Deimling1, J Larson, R Wellenreuther

  • 1Department of Neuropathology, Charité, Humboldt University, Berlin, Germany. andreas.von_deimling@charite.de

Brain Pathology (Zurich, Switzerland)
|October 12, 1999
PubMed

Insights

Recurrent meningiomas often originate from tumor fragments disseminated during surgery, not independent growth. This study confirms clonality in recurring meningiomas, highlighting risks during resection.

Area of Science:

  • Neurosurgery
  • Oncology
  • Genetics

Background:

  • Meningiomas are common primary brain and spinal tumors treated by surgical resection.
  • Recurrence is frequent despite surgical advances, but the origin of recurrent tumors remains unclear.

Purpose of the Study:

  • To investigate the clonality of recurrent meningiomas relative to primary tumors.
  • To determine if recurrences arise from incomplete resection, tumor fragment dissemination, or independent growth.

Main Methods:

  • Analysis of X-chromosome inactivation patterns (PGK/AR genes) in primary and recurrent meningiomas from five patients.
  • Mutation analysis of the NF2 gene in primary and recurrent meningiomas from a sixth patient.

Main Results:

  • All analyzed recurrent meningiomas were clonal with respect to their primary lesions (p<0.01).
  • Identical NF2 mutations were found in the primary and all recurrent tumors of the sixth patient.
  • Findings strongly indicate a common origin for primary and recurrent meningiomas.

Conclusions:

  • Recurrent meningiomas typically arise from tumor cell dissemination during initial surgical resection.
  • Meningioma cells have a potential for seeding during surgical procedures, necessitating careful surgical technique.

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