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Related Experiment Videos

[Meningioma. Classification and grading]

I Niedermayer1, H Kolles, W Henn

  • 1Abteilung für Neuropathologie, Universitätskliniken des Saarfandes, Homburg-Saar.

Der Pathologe
|February 12, 1998
PubMed
Summary
This summary is machine-generated.

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Histological grading of meningiomas is challenging. This study defines 3 grades using Ki-67 indices and identifies alkaline phosphatase as a marker for recurrence in atypical meningiomas.

Area of Science:

  • Neuro-oncology
  • Pathology
  • Molecular Biology

Context:

  • Meningiomas are the most common primary brain tumors in adults.
  • The WHO classification includes 'atypical meningioma' but histological criteria can be ambiguous.
  • Accurate grading is crucial for predicting recurrence and guiding treatment.

Purpose:

  • To improve meningioma grading beyond traditional histology.
  • To identify objective parameters for distinguishing tumor subtypes.
  • To validate new markers for predicting meningioma recurrence.

Summary:

  • Defined 3 meningioma grades using morphometric Ki-67 indices and 95% confidence intervals, validated against recurrence-free intervals.
  • Identified specific histological features of atypical meningiomas, including growth pattern and nucleoli.

Related Experiment Videos

  • Found 1p-loss in 50% of atypical/anaplastic meningiomas and linked alkaline phosphatase (ALPL) activity loss to 1p-loss and tumor progression.

    • Impact:

    • Provides a more objective grading system for meningiomas.
    • Suggests renaming 'atypical meningioma' to 'intermediate type' to reduce diagnostic ambiguity.
    • Highlights ALPL as a potential biomarker for meningioma recurrence and progression.