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  • Title: Cognitive and Adaptive Outcomes After Proton Radiation for Pediatric Patients With Brain Tumors.
    Author: Pulsifer MB, Duncanson H, Grieco J, Evans C, Tseretopoulos ID, MacDonald S, Tarbell NJ, Yock TI.
    Journal: Int J Radiat Oncol Biol Phys; 2018 Oct 01; 102(2):391-398. PubMed ID: 30108004.
    Abstract:
    PURPOSE: Radiation therapy is integral in treatment of pediatric brain tumors, but it is associated with negative long-term sequelae. Proton beam radiation therapy (PRT), which enables better focusing of radiation on tumors, may entail fewer sequelae. This prospective study examined cognitive and adaptive functioning in children and young adults treated with PRT. METHODS AND MATERIALS: A total of 155 patients were assessed using age-appropriate measures for cognitive and adaptive functioning at start of or during PRT (baseline) and at follow-up. Mean age at baseline was 8.9 years; mean follow-up interval was 3.6 years. Diagnoses included medulloblastoma, craniopharyngioma, ependymoma, glial tumors, germ cell tumors, and others. The sample was divided by age at baseline (<6 years [N = 57, or 37%] and ≥6 years [N = 98, or 63%]) and by PRT field (craniospinal irradiation [CSI; 39%] and focal irradiation [61%]). RESULTS: Scores for mean intelligence quotient (IQ) and adaptive functioning skills were in the average range at baseline and follow-up. Overall, mean IQ scores declined from 105.4 to 102.5 (P = .005); however, only the younger CSI group showed significant decline. Patients receiving CSI, regardless of age, appeared particularly vulnerable in IQ, processing speed, and working memory. Adaptive skills were stable across the 4 age-by-treatment field groups. CONCLUSIONS: At a mean of 3.6 years after PRT, IQ declined slightly for the group, largely because of significant IQ decline in younger patients treated with CSI. No significant change was seen in patients <6 years treated with focal PRT or in older patients. Adaptive skills remained stable across age and treatment type.
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