Abstract
Purpose
Progressive pediatric optic pathway gliomas (OPGs) are treated by diverse systemic antitumor modalities. Refined insights on the course of intra-tumoral components are limited.
Methods
We performed an exploratory study on the longitudinal volumetric course of different (intra-)tumor components by manual segmentation of MRI at the start and after 3, 6 and 12 months of bevacizumab (BVZ) treatment.
Results
Thirty-one patients were treated with BVZ (median 12 months, range: 2–39 months). During treatment the total tumor volume decreased with median 19.9% (range: − 62.3 to + 29.7%; n = 30) within the first 3 months, decreased 19.0% (range: − 68.8 to + 96.1%; n = 28) between start and 6 months and 27.2% (range: −73.4 to + 36.0%; n = 21) between start and 12 months. Intra-tumoral cysts were present in 12 OPGs, all showed a decrease of volume during treatment. The relative contrast enhanced volume of NF1 associated OPG (n = 11) showed an significant reduction compared to OPG with a KIAA1549-BRAF fusion (p < 0.01). Three OPGs progressed during treatment, but were not preceded by an increase of relative contrast enhancement.
Conclusion
Treatment with BVZ of progressive pediatric OPGs leads to a decrease of both total tumor volume and cystic volume for the majority of OPGs with emphasis on the first three months. NF1 and KIAA1549-BRAF fusion related OPGs showed a different (early) treatment effect regarding the tumor enhancing component on MRI, which did not correlate with tumor volume changes. Future research is necessary to further evaluate these findings and its relevance to clinical outcome parameters.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- BVZ:
-
Bevacizumab
- IRI:
-
Irinotecan
- KIAA1549-BRAF:
-
Fusion of the human gene that encodes the KIAA1549 protein and the B-raf: (proto-)oncogene
- MDC:
-
Modified Dodge Classification
- NF1:
-
Neurofibromatosis type 1
- nNF1:
-
No neurofibromatosis type 1
- OPG:
-
Optic pathway glioma
- PMA:
-
Pilomyxoid astrocytoma
- PP:
-
Percent point
- SAT:
-
Systemic anticancer therapy
- Segmentation:
-
Manual volumetric segmentation
- TTV:
-
Total tumor volume
- TDM:
-
Tumor diameter measurements
- VBL:
-
Vinblastin
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Funding
This study was funded by the ODAS foundation: grant number: 2019-01.
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CAB: Conceptualisation, funding acquisition, methodology, project administration, resources, supervision, validation, writing, original draft preparation. CRS: Data curation, formal analysis, investigation, methodology, project administration, visualisation, writing—original draft preparation. MCMS: Resources, writing, original draft preparation. PS: Funding, writing—review and editing. GLP: Resources, writing—review and editing. JWRP: Resources, writing—review and editing. ATD: Resources, writing—review and editing. RO: Resources, writing—review and editing. AYSM: Funding acquisition, methodology, resources, writing—review and editing. MCJ: Methodology, investigation, normal analysis, writing—review and editing. PG: Conceptualization, methodology, investigation, resources, writing—review and editing, supervision, funding acquisition.
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Author R. Oostenbrink provides advisory consultations for Alexion, with incidental honoraria and is a full member of Genturis ERN.
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This is a retrospective study. The Research Ethics Committee of the Amsterdam UMC, Erasmus MC, Radboud UMC and UMC Groningen have confirmed that no ethical approval is required. Approval according to the principles of the Declaration of Helsinki was granted by the Ethics Committee of University of the UMC Utrecht, Princess Máxima Center.
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Bennebroek, C.A., Schouten, C.R., Montauban-van Swijndregt, M.C. et al. Treatment evaluation by volumetric segmentation in pediatric optic pathway glioma: evaluation of the effect of bevacizumab on intra-tumor components. J Neurooncol 166, 79–87 (2024). https://doi.org/10.1007/s11060-023-04516-y
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DOI: https://doi.org/10.1007/s11060-023-04516-y