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Primary Orthotopic Glioma Xenografts Recapitulate Infiltrative Growth and Isocitrate Dehydrogenase I Mutation
Published on: January 14, 2014
Gliosarcoma arising from an oligodendroglioma (oligosarcoma).
Annie Hiniker1, Jill M Hagenkord, Martin P Powers
1Department of Pathology, University of California San Francisco, CA, USA. Anne.Hinker@ucsfmedctr.org
Clinical Neuropathology
|December 21, 2012
Summary
This study presents a rare case of oligodendroglioma transforming into gliosarcoma, demonstrating mesenchymal metaplasia. Genetic analysis reveals loss of 1p19q co-deletion in the recurrent gliosarcoma, suggesting clonal evolution.
Area of Science:
- Neuro-oncology
- Cancer Genetics
- Pathology
Background:
- Gliosarcoma is a rare, aggressive brain tumor typically classified as glioblastoma (WHO Grade IV).
- Oligodendrogliomas are glial tumors often characterized by 1p19q co-deletion and IDH1 mutations.
Observation:
- A patient initially diagnosed with WHO Grade II oligodendroglioma with 1p19q co-deletion developed a recurrent tumor diagnosed as gliosarcoma.
- The recurrent gliosarcoma retained IDH1 R132H expression but lost the 1p19q co-deletion.
- Genetic analysis showed loss of heterozygosity (LOH) on chromosomes 1 and 19 in the gliosarcoma, contrasting with the intact chromosomes in the original oligodendroglioma.
Findings:
- This case provides detailed genetic evidence supporting sarcomatous transformation (mesenchymal metaplasia) of an oligodendroglioma.
- The genetic alterations observed suggest a process of clonal evolution from oligodendroglioma to gliosarcoma.
- The loss of 1p19q co-deletion in the recurrent tumor is a key genetic event differentiating it from the primary tumor.
Implications:
- This finding expands our understanding of the potential dedifferentiation pathways in brain tumors.
- It highlights the importance of comprehensive genetic profiling in recurrent gliomas.
- Further research into the mechanisms of mesenchymal transformation in oligodendroglioma is warranted.
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