Abstract
Purpose
Although radiation therapy (RT) is a common treatment for pediatric brain tumors, it is associated with detrimental long-term effects such as impaired cognition, vascular injury, and increased stroke risk. This study aimed to develop metrics that describe vascular injury and relate them to the presence of cerebral microbleeds (CMBs) and cognitive performance scores.
Methods
Twenty-five young adult survivors of pediatric brain tumors treated with either whole-brain (n = 12), whole-ventricular (n = 7), or no RT (n = 6) underwent 7T MRI and neurocognitive testing. Simultaneously acquired MR angiography and susceptibility-weighted images were used to segment CMBs and vessels and quantify their radii and volume.
Results
Patients treated with whole-brain RT had significantly lower arterial volumes (p = 0.003) and a higher proportion of smaller vessels (p = 0.003) compared to the whole-ventricular RT and non-irradiated control patients. Normalized arterial volume decreased with increasing CMB count (R = − 0.66, p = 0.003), and decreasing trends were observed with time since RT and at longitudinal follow-up. Global cognition and verbal memory significantly decreased with smaller normalized arterial volume (p ≤ 0.05).
Conclusions
Arterial volume is reduced with increasing CMB presence and is influenced by the total brain volume exposed to radiation. This work highlights the potential use of vascular-derived metrics as non-invasive markers of treatment-induced injury and cognitive impairment in pediatric brain tumor patients.
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Acknowledgements
This work was supported by NIH-NICHD grant RO1HD079568 and funding from the La Roche family. We thank all the patients and families for their participation in this study.
Funding
This work was supported by NIH-NICHD grant RO1HD079568 as well as the La Roche family.
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Study design: JML, SM. Data collection: AJ, EF, SS. Image processing and analysis: SA, MAM. Statistical analysis: SA, AMM, MAM. Data interpretation: JML, SA, SM, AMM, SEB, CPH. Manuscript preparation: SA, MAM, JML. All authors approved the final manuscript content.
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This study was approved by our institutional review board and performed in accordance with the ethical standards of the institutional and national research committees or comparable ethical standards. Written informed consent, or assent when appropriate, was obtained from all individual participants and additional parental consent was obtained for all minors.
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Avadiappan, S., Morrison, M.A., Jakary, A. et al. Relationship between 7T MR-angiography features of vascular injury and cognitive decline in young brain tumor patients treated with radiation therapy. J Neurooncol 153, 143–152 (2021). https://doi.org/10.1007/s11060-021-03753-3
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DOI: https://doi.org/10.1007/s11060-021-03753-3