What question did this study set out to answer?

To evaluate the clinical, histologic, and molecular characteristics and risk factors of malignant transformation in pediatric low-grade gliomas.

February 9, 2007Journal of Clinical Oncology

Clinical and Molecular Characteristics of Malignant Transformation of Low-Grade Glioma in Children

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To evaluate the clinical, histologic, and molecular characteristics and risk factors of malignant transformation in pediatric low-grade gliomas.
Reviewed clinical, radiologic, and histologic data of pediatric patients experiencing malignant transformation (MT) of low-grade glioma (LGG) at a single center.
Calculated cumulative incidence and evaluated MT risk factors among a subcohort of 65 pediatric patients diagnosed with grade 2 astrocytoma.
Analyzed tumor alterations using fluorescence in situ hybridization, immunohistochemistry, and TP53 sequencing across paired pre- and post-transformation samples (n = 9) and single-timepoint samples (n = 2).
Malignant transformation was identified in 11 patients (median age at LGG diagnosis 13.3 years) after a median latency of 5.1 years, transforming to glioblastoma (n = 7) and other high-grade gliomas (n = 4).
The 15-year cumulative incidence of MT was 6.7% ± 3.9% among 65 patients with grade 2 astrocytoma, with no analyzed clinical risk factor (including radiotherapy) significantly associated with transformation.
Post-MT tumors demonstrated increased TP53 overexpression, RB1 and/or CDKN2A deletions in 71% of LGGs and 90% of transformed tumors, PTEN pathway defects in 76%, and PDGFRA amplification in 1 patient.

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Implication

Retrospective cohort study reveals adult-like molecular alterations driving malignant transformation in pediatric low-grade glioma, indicating shared pathways across age groups.

Cite This Study

Broniscer et al. (2007) studied this question.

synapsesocial.com/papers/6a71ef29a2d7cf2e39c2e00d https://doi.org/10.1200/jco.2006.06.8213

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Implication

Retrospective cohort study reveals adult-like molecular alterations driving malignant transformation in pediatric low-grade glioma, indicating shared pathways across age groups.

Clinical and Molecular Characteristics of Malignant Transformation of Low-Grade Glioma in Children

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Discussion

Implication

Cite This Study

Clinical and Molecular Characteristics of Malignant Transformation of Low-Grade Glioma in Children

Key Points

Discussion

Implication

Cite This Study

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