Hippocampal radiotherapy dose constraints for predicting long-term neurocognitive outcomes: mature data from a prospective trial in young patients with brain tumors

Abstract Background Hippocampus is considered to be the seat for neurocognitive functions. Avoidance of hippocampus during radiotherapy to brain may serve to preserve various domains of neurocognition. We aimed to derive radiotherapy dose constraints to hippocampi for preserving neurocognition in yo...

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Published in:Neuro-oncology (Charlottesville, Va.) Va.), 2020-11, Vol.22 (11), p.1677-1685
Main Authors: Goda, Jayant S, Dutta, Debnarayan, Krishna, Uday, Goswami, Savita, Kothavade, Vikas, Kannan, Sadhna, Maitre, Madan, Bano, Nazia, Gupta, Tejpal, Jalali, Rakesh
Format: Article
Language:English
Subjects:
Adolescent
Brain Neoplasms - radiotherapy
Child
Female
Glioma
Hippocampus
Humans
Male
Pediatric Neuro-Oncology
Pituitary Neoplasms
Prospective Studies
Radiotherapy Dosage
Radiotherapy Planning, Computer-Assisted
Treatment Outcome
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Summary:Abstract Background Hippocampus is considered to be the seat for neurocognitive functions. Avoidance of hippocampus during radiotherapy to brain may serve to preserve various domains of neurocognition. We aimed to derive radiotherapy dose constraints to hippocampi for preserving neurocognition in young patients with brain tumors by measuring various neurocognitive parameters. Methods Forty-eight patients with residual/progressive benign or low-grade brain tumors treated with stereotactic conformal radiotherapy (SCRT) to a dose of 54 Gy in 30 fractions underwent prospective neuropsychological assessments at baseline before SCRT and at 6 months and 2, 3, 4, and 5 years. Hippocampi were drawn as per the Radiation Therapy Oncology Group atlas. Longitudinal change in intelligence quotient scores was correlated with hippocampal doses. Results Mean volume of bilateral hippocampi was 4.35 cc (range: 2.12–8.41 cc). Craniopharyngioma was the commonest histologic subtype. A drop of >10% in mean full-scale intelligence quotient (FSIQ) scores at 3 and 5 years post SCRT was observed in patients in whom left hippocampus received a mean dose of 30.7 Gy (P = 0.04) and 31 Gy (P = 0.04), respectively. Mean performance quotient (PQ) scores dropped > 10% at 5 years when the left hippocampus received a dose of > 32 Gy (P = 0.03). There was no significant correlation of radiotherapy doses with verbal quotient, or with doses received by the right hippocampus. Multivariate analysis revealed young age (
ISSN:1522-8517
1523-5866
DOI:10.1093/neuonc/noaa076