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Modeling Astrocytoma Pathogenesis In Vitro and In Vivo Using Cortical Astrocytes or Neural Stem Cells from Conditional, Genetically Engineered Mice
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IDH-1 polymorphisms in pilocytic astrocytomas.

Richard A Prayson1

  • 1Department of Anatomic Pathology, L25, Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA.

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|November 3, 2019
PubMed
Summary

This study identified rare isocitrate dehydrogenase (IDH)-1 polymorphisms in two pilocytic astrocytoma cases. These findings highlight the importance of accurate IDH alteration assessment to avoid misdiagnosis.

Keywords:
GliomaIDH-1 mutationIDH-1 polymorphismIDH-2 mutationPilocytic astrocytoma

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Area of Science:

  • Neuro-oncology
  • Molecular Diagnostics
  • Cancer Genetics

Background:

  • Isocitrate dehydrogenase (IDH)-1 and IDH-2 mutations are key diagnostic markers for oligodendroglioma and present in many astrocytomas.
  • Alterations in IDH-1 and IDH-2 are infrequently reported in pilocytic astrocytomas.

Observation:

  • Two cases of pilocytic astrocytomas in young adults (21-year-old male, 19-year-old female) were analyzed.
  • Polymerase chain reaction (PCR) testing and sequencing revealed IDH-1 polymorphisms (G105G, c.315C>T) in both tumors.
  • Immunohistochemistry showed no IDH-1 (R132H) staining, no BRAF V600E, minimal p53 (<5%), and retained ATRX expression in both cases.

Findings:

  • The study identified novel IDH-1 polymorphisms in pilocytic astrocytomas, distinct from the common IDH mutations.
  • These polymorphisms were not detected by standard IDH-1 (R132H) antibody staining.

Implications:

  • The presence of IDH-1 polymorphisms in pilocytic astrocytomas warrants further investigation into their clinical significance.
  • Accurate identification of IDH alterations is crucial to prevent misclassification of pilocytic astrocytomas as other glioma subtypes, such as fibrillary astrocytoma or oligodendroglioma.