The relationship between age and neurocognitive functioning following proton beam radiotherapy (PRT) in low-and intermediate-grade gliomas (LIGG) has yet to be examined. Eighteen LIGG patients treated with PRT were prospectively enrolled and received annual neurocognitive evaluations of perceptual/verbal reasoning, working memory, and processing speed postradiotherapy. The median age at diagnosis was 8.2 years (range 1.0-14.7) and the median age at PRT was 9.9 years (range 4.2-17.0).Patients' neurocognitive performance did not change on any measure following PRT (p ≥ .142). We did not observe significant changes in cognitive function over time among a small group of LIGG patients treated with PRT.

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