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Related Experiment Video

Updated: Jul 15, 2025

Primary Orthotopic Glioma Xenografts Recapitulate Infiltrative Growth and Isocitrate Dehydrogenase I Mutation

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[Glioblastoma, IDH-Wildtype].

Ichiyo Shibahara¹, Toshihiro Kumabe

¹Department of Neurosurgery, Kitasato University School of Medicine.

No Shinkei Geka. Neurological Surgery

|September 24, 2023

Summary

The 2021 WHO CNS tumor classification updates glioblastoma. Glioblastoma IDH-mutant is now astrocytoma IDH-mutant WHO grade 4, impacting neurosurgical practice.

Area of Science:

Neuropathology
Neuro-oncology
Molecular Diagnostics

Background:

The 5th edition of the WHO Classification of Central Nervous System Tumours (WHO 2021) introduces significant changes.
Molecular features are now central to CNS tumor classification.
Previous classifications, like WHO 2016, are being superseded.

Approach:

This review synthesizes key updates in glioblastoma classification from WHO 2021.
It focuses on the reclassification of glioblastoma IDH-mutant to astrocytoma IDH-mutant WHO grade 4.
The review highlights practical implications for neurosurgical practice.

Key Points:

Glioblastoma IDH-mutant (WHO 2016) is now classified as astrocytoma IDH-mutant WHO grade 4 (WHO 2021).
Molecular classification is paramount in the updated WHO CNS tumor guidelines.

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Understanding these changes is crucial for accurate diagnosis and treatment planning.

Conclusions:

The WHO 2021 classification necessitates a revised understanding of diffuse gliomas.
Neurosurgeons must be aware of these molecular-based diagnostic shifts.
Accurate application of the new classification is vital for patient management and research.