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 language | English (US) |
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Pages (from-to) | 1337-1347 |
Number of pages | 11 |
Journal | Neuro-oncology |
Volume | 23 |
Issue number | 8 |
DOIs | |
State | Published - Aug 1 2021 |
Keywords
- cognition
- glioblastoma
- proton therapy
- radiation
- randomized controlled trial
ASJC Scopus subject areas
- Oncology
- Clinical Neurology
- Cancer Research
MD Anderson CCSG core facilities
- Biostatistics Resource Group