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- W3127619327 abstract "Abstract Background: Endocrine deficiencies are common following craniospinal irradiation (CSI) in children with brain tumors, but empirical data comparing outcomes following proton (PRT) and photon radiation therapy (XRT) are limited. Methods: This retrospective chart review compared the incidence of hypothyroidism, growth hormone deficiency (GHD), and adrenal insufficiency (AI) in patients with medulloblastoma treated with XRT and PRT between 1997 and 2016. All patients received CSI and had routine endocrine screening labs to evaluate for thyroid dysfunction, GHD, and AI. We used proportional hazards regression to calculate hazard ratios (HR) and 95% confidence intervals (CI) comparing the development of hypothyroidism, AI, and GHD between radiation modalities, adjusting for age at diagnosis, sex, race/ethnicity, and CSI dose. Results: We identified 118 patients with medulloblastoma who were followed for a median of 5.6 years from the end of radiotherapy. Thirty-five (31%) patients developed hypothyroidism, 71 (66%) GHD, and 20 (18%) AI. Compared to PRT, XRT was associated with a higher incidence of primary (28% vs. 6%; HR=4.61, 95% CI 1.2-17.7, p=0.03) and central hypothyroidism (33% vs. 9%; HR 2.35 (0.8-6.8, p=0.12). GHD and AI incidence rates were similar between the groups. Conclusions: Primary and central hypothyroidism occur less often after PRT CSI, compared to XRT CSI. This suggests that the thyroid and pituitary glands receive less radiation after spine and posterior fossa boost RT, respectively, using PRT." @default.
- W3127619327 created "2021-02-15" @default.
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- W3127619327 date "2021-02-08" @default.
- W3127619327 modified "2023-09-26" @default.
- W3127619327 title "Comparison of Endocrine Outcomes Following Proton and Photon Radiotherapy in Children With Medulloblastoma " @default.
- W3127619327 doi "https://doi.org/10.21203/rs.3.rs-171471/v1" @default.
- W3127619327 hasPublicationYear "2021" @default.
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