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Pediatric high-grade gliomas in patients with neurofibromatosis type 1-A collaborative cohort study from the SIOPE HGG/DIPG working group.

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PMID41798124
JournalNeuro-oncology practice
Publication Date2025-10-07
Ingested2026-08-02 12:05 AM
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BACKGROUND: We assessed clinical features, treatment, and survival of pediatric patients with neurofibromatosis type 1 (NF1) with high-grade glioma (HGG). METHODS: Patients from this retrospective cohort study were identified through an international collaborative effort by the SIOPE HGG/DIPG working group. NF1 was diagnosed based on clinical presentation and confirmed by either a pathogenic germline NF1 gene alteration or the exclusion of mismatch repair deficiency. A control cohort without genetic cancer predisposition was matched in a 2:1-ratio from the HIT-HGG database. RESULTS: We identified 29 pediatric patients with NF1-associated HGG. Median age at diagnosis of HGG was 11 years. All but 1 tumor arose outside the optic pathway and included circumscribed and diffuse HGG. Molecular analysis in a subset of tumors identified an enrichment of alterations in CDKN2A, TP53, and ATRX. Event-free and overall survival were as poor as in matched sporadic HGG patients. The prognosis was not superior with upfront radiotherapy compared with delayed radiotherapy. CONCLUSIONS: NF1-associated HGGs behave as aggressively as their sporadic counterparts. The relevance of delaying radiotherapy until the time of progression and adjuvant MEK inhibitor treatment needs further investigation.

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Pediatric high-grade gliomas in patients with neurofibromatosis type 1-A collaborative cohort study from the SIOPE HGG/DIPG working group.

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