TY - JOUR
T1 - Radiation doses to brain substructures associated with cognition in radiotherapy of pediatric brain tumors
AU - Toussaint, Laura
AU - Indelicato, Daniel J
AU - Stokkevåg, Camilla H
AU - Lassen, Yasmin Alexandra
AU - Pedro, Catia
AU - Mikkelsen, Ronni
AU - Di Pinto, Marcos
AU - Li, Zuofeng
AU - Flampouri, Stella
AU - Vestergaard, Anne
AU - Petersen, Jørgen B B
AU - Schrøder, Henrik
AU - Høyer, Morten
AU - Muren, Ludvig P
PY - 2019/10
Y1 - 2019/10
N2 - Background: Several brain substructures associated with cognition (BSCs) are located close to typical pediatric brain tumors. Pediatric patients therefore have considerable risks of neurocognitive impairment after brain radiotherapy. In this study, we investigated the radiation doses received by BSCs for three common locations of pediatric brain tumor entities. Material and methods: For ten patients in each group [posterior fossa ependymoma (PFE), craniopharyngioma (CP), and hemispheric ependymoma (HE)], the cumulative fraction of BSCs volumes receiving various dose levels were analyzed. We subsequently explored the differences in dose pattern between the three groups and used available dose response models from the literature to estimate treatment-induced intelligence quotient (IQ) decline. Results: Doses to BSCs were found to differ considerably between the groups, depending on their position relative to the tumor. Large inter-patient variations were observed in the ipsilateral structures of the HE groups, and at low doses for all three groups. IQ decline estimates differed depending on the model applied, presenting larger variations in the HE group. Conclusion: While there were notable differences in the dose patterns between the groups, the extent of estimated IQ decline depended more on the model applied. This inter-model variability should be considered in dose-effect assessments on cognitive outcomes of pediatric patients.
AB - Background: Several brain substructures associated with cognition (BSCs) are located close to typical pediatric brain tumors. Pediatric patients therefore have considerable risks of neurocognitive impairment after brain radiotherapy. In this study, we investigated the radiation doses received by BSCs for three common locations of pediatric brain tumor entities. Material and methods: For ten patients in each group [posterior fossa ependymoma (PFE), craniopharyngioma (CP), and hemispheric ependymoma (HE)], the cumulative fraction of BSCs volumes receiving various dose levels were analyzed. We subsequently explored the differences in dose pattern between the three groups and used available dose response models from the literature to estimate treatment-induced intelligence quotient (IQ) decline. Results: Doses to BSCs were found to differ considerably between the groups, depending on their position relative to the tumor. Large inter-patient variations were observed in the ipsilateral structures of the HE groups, and at low doses for all three groups. IQ decline estimates differed depending on the model applied, presenting larger variations in the HE group. Conclusion: While there were notable differences in the dose patterns between the groups, the extent of estimated IQ decline depended more on the model applied. This inter-model variability should be considered in dose-effect assessments on cognitive outcomes of pediatric patients.
U2 - 10.1080/0284186X.2019.1629014
DO - 10.1080/0284186X.2019.1629014
M3 - Journal article
C2 - 31271084
SN - 0284-186X
VL - 58
SP - 1457
EP - 1462
JO - Acta Oncologica
JF - Acta Oncologica
IS - 10
ER -