A prospective phase II randomized trial of proton radiotherapy vs intensity-modulated radiotherapy for patients with newly diagnosed glioblastoma

Paul D. Brown*, Caroline Chung, Diane D. Liu, Sarah McAvoy, David Grosshans, Karine Al Feghali, Anita Mahajan, Jing Li, Susan L. McGovern, Mary Fran McAleer, Amol J. Ghia, Erik P. Sulman, Marta Penas-Prado, John F. De Groot, Amy B. Heimberger, Jihong Wang, Terri S. Armstrong, Mark R. Gilbert, Nandita Guha-Thakurta, Jeffrey S. Wefel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Background: To determine if proton radiotherapy (PT), compared to intensity-modulated radiotherapy (IMRT), delayed time to cognitive failure in patients with newly diagnosed glioblastoma (GBM). Methods: Eligible patients were randomized unblinded to PT vs IMRT. The primary endpoint was time to cognitive failure. Secondary endpoints included overall survival (OS), intracranial progression-free survival (PFS), toxicity, and patient-reported outcomes (PROs). Results: A total of 90 patients were enrolled and 67 were evaluable with median follow-up of 48.7 months (range 7.1-66.7). There was no significant difference in time to cognitive failure between treatment arms (HR, 0.88; 95% CI, 0.45-1.75; P =. 74). PT was associated with a lower rate of fatigue (24% vs 58%, P =. 05), but otherwise, there were no significant differences in PROs at 6 months. There was no difference in PFS (HR, 0.74; 95% CI, 0.44-1.23; P =. 24) or OS (HR, 0.86; 95% CI, 0.49-1.50; P =. 60). However, PT significantly reduced the radiation dose for nearly all structures analyzed. The average number of grade 2 or higher toxicities was significantly higher in patients who received IMRT (mean 1.15, range 0-6) compared to PT (mean 0.35, range 0-3; P =. 02). Conclusions: In this signal-seeking phase II trial, PT was not associated with a delay in time to cognitive failure but did reduce toxicity and patient-reported fatigue. Larger randomized trials are needed to determine the potential of PT such as dose escalation for GBM and cognitive preservation in patients with lower-grade gliomas with a longer survival time.

Original languageEnglish (US)
Pages (from-to)1337-1347
Number of pages11
JournalNeuro-oncology
Volume23
Issue number8
DOIs
StatePublished - Aug 1 2021
Externally publishedYes

Keywords

  • cognition
  • glioblastoma
  • proton therapy
  • radiation
  • randomized controlled trial

ASJC Scopus subject areas

  • Oncology
  • Clinical Neurology
  • Cancer Research

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