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• W4281729651 abstract "Abstract BACKGROUND: Central hypothyroidism is a well-known late effect of radiotherapy in children treated for brain tumours. AIM: To determine the risk of central hypothyroidism (CH) and the radiation dose-volume predictors of its onset. METHODS: We retrospectively analyzed 64 patients who received radiotherapy for brain tumours, with at least a 2-year-long serological follow-up, determined CH incidence and radiation predictive factors of its onset. To estimate the risk of CH according to the site of the tumour inside the central nervous system (CNS) we considered the sellar-suprasellar region, anterior cranial region, and others. For the same purpose, a further analysis was conducted comparing craniospinal radiotherapy (CSI) versus involved-field radiotherapy (IF-RT). Dose constraints for CH were determined using the Receiver Operating Characteristic to identify the pituitary mean dose cut-off and the probability of CH over time was assessed with the Cox model. RESULTS: 18 cases were excluded due to the presence of CH before RT; 17 of remaining 46 (37%) patients presented CH during follow-up: 14 of 17 (82%) patients received CSI, 3 (18%) IF-RT sellar-suprasellar region and anterior cranial region. A median dose higher than 30.5 Gy to the pituitary gland results in a 4-fold increased risk of central hypothyroidism (HR=3.9; 95% CI 1.1, 13.4; p=0.03). Almost 90% of events occurred within 5 years after treatment ended. 29 of 46 (63%) patients did not manifest CH and were in the other regions”. However, 14 of these (48%) underwent CSI. CONCLUSIONS: Our data confirm the relationship between central hypothyroidism and mean pituitary radiation dose, and suggest a minimum of 5 years follow up in children brain tumor survivors. Tumours outside the sellar-suprasellar region, treated with radiotherapy, are not associated with CH onset. A significant association between CSI and risk of CH, highlighted with our analysis, warrants further investigations and a longer follow up" @default.
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• W4281729651 date "2022-06-01" @default.
• W4281729651 modified "2023-10-17" @default.
• W4281729651 title "RONC-10. Radiation-induced hypothyroidism in pediatric brain tumour survivors: radiation dose-volume predictors of its onset" @default.
• W4281729651 doi "https://doi.org/10.1093/neuonc/noac079.664" @default.
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