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Clonality of multiple meningiomas

A P Stangl1, R Wellenreuther, D Lenartz

  • 1Institute of Neuropathology and Neurosurgery Clinic, University Hospital of Bonn, Germany.

Journal of Neurosurgery
|May 1, 1997
PubMed
Summary

Most multiple meningiomas stem from a single cell's mutation in the neurofibromatosis type 2 (NF2) gene. Tumor cells likely spread through cerebrospinal fluid to form new, clonal meningiomas.

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Area of Science:

  • Oncology
  • Genetics
  • Neurosurgery

Background:

  • Multiple meningiomas can develop without clear anatomical connections.
  • The neurofibromatosis type 2 (NF2) gene is frequently inactivated in meningiomas.

Purpose of the Study:

  • To investigate the genetic origin of multiple meningiomas.
  • To determine if multiple meningiomas arise from a single clone or independent events.

Main Methods:

  • DNA analysis of 39 meningiomas from 12 patients.
  • Single-strand conformation polymorphism and DNA sequencing of the NF2 gene.
  • Analysis of constitutional DNA to exclude inherited NF2 mutations.

Main Results:

  • NF2 gene mutations were found in 10 of 12 patients.

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  • In 6 patients, all tumors shared identical NF2 mutations, indicating clonal origin.
  • Four patients with multiple lesions had clonal meningiomas; two had distinct mutations.
  • Conclusions:

    • The majority of multiple meningiomas with NF2 mutations are of somatic and clonal origin.
    • Spread of tumor cells via cerebrospinal fluid is the likely mechanism for multiple tumor development.