Improved neuropsychological outcomes following proton therapy relative to X-ray therapy for pediatric brain tumor patients

Jeffrey P. Gross, Stephanie Powell, Frank Zelko, William Hartsell, Stewart Goldman, Jason R Fangusaro, Rishi R Lulla, Natasha Pillay Smiley, John Han Chih Chang, Vinai Gondi*

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Background: Survivors of pediatric brain tumors are at risk for impaired development in multiple neuropsychological domains. The purpose of this study was to compare neuropsychological outcomes of pediatric brain tumor patients who underwent X-ray radiotherapy (XRT) versus proton radiotherapy (PRT). Methods: Pediatric patients who underwent either XRT or PRT and received posttreatment age-appropriate neuropsychological evaluation-including measures of intelligence (IQ), attention, memory, visuographic skills, academic skills, and parent-reported adaptive functioning-were identified. Multivariate analyses were performed to assess differences in neuropsychological outcomes and included tests for interaction between treatment cohort and follow-up time. Results: Between 1998 and 2017, 125 patients with tumors located in the supratentorial (17.6%), midline (28.8%), or posterior fossa (53.6%) compartments received radiation and had posttreatment neuropsychological evaluation. Median age at treatment was 7.4 years. The PRT patient cohort had higher estimated SES and shorter median time from radiotherapy completion to last neuropsychological evaluation (6.7 vs 2.6 y, P < 0.001). On multivariable analysis, PRT was associated with higher full-scale IQ (β = 10.6, P = 0.048) and processing speed (β = 14.4, P = 0.007) relative to XRT, with trend toward higher verbal IQ (β = 9.9, P = 0.06) and general adaptive functioning (β = 11.4, P = 0.07). Planned sensitivity analyses truncating follow-up interval in the XRT cohort re-demonstrated higher verbal IQ (P = 0.01) and IQ (P = 0.04) following PRT, with trend toward improved processing speed (P = 0.09). Conclusions: PRT is associated with favorable outcomes for intelligence and processing speed. Combined with other strategies for treatment de-intensification, PRT may further reduce neuropsychological morbidity of brain tumor treatment.

Original languageEnglish (US)
Article numbernoz070
Pages (from-to)934-943
Number of pages10
JournalNeuro-oncology
Volume21
Issue number7
DOIs
StatePublished - Jul 11 2019

Keywords

  • neuropsychologic outcomes
  • pediatrics
  • proton therapy
  • radiotherapy

ASJC Scopus subject areas

  • Oncology
  • Clinical Neurology
  • Cancer Research

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    Gross, J. P., Powell, S., Zelko, F., Hartsell, W., Goldman, S., Fangusaro, J. R., Lulla, R. R., Smiley, N. P., Chang, J. H. C., & Gondi, V. (2019). Improved neuropsychological outcomes following proton therapy relative to X-ray therapy for pediatric brain tumor patients. Neuro-oncology, 21(7), 934-943. [noz070]. https://doi.org/10.1093/neuonc/noz070