Effectiveness and safety of proton therapy in intracranial meningioma treatment: a systematic review and meta-analysis

Clinical Snapshot

Key Findings

• P Value: p < 0.001 for survival and complications

• Effect Size: Complication rate: 16% (95% CI 5-27%)

• Primary Outcome: 5-year overall survival: 91% (95% CI 88-94%)

• Nnt Or Sensitivity: High heterogeneity limits clinical interpretation (I² = 98.5% for complications)

• Confidence Interval: Local control: 71% (95% CI 50-86%)

Clinical Application

Limited by proton therapy availability and cost; requires specialized centres Proton therapy available at select centres; PBS coverage limited; consider for cases where conventional radiotherapy poses high normal tissue risk Adult patients with intracranial meningiomas, particularly those with anatomically complex or incompletely resected tumors

Abstract

Meningiomas are the most common primary intracranial tumors, often treated surgically. However, complete resection is frequently limited by proximity to critical structures, necessitating adjuvant or definitive radiotherapy. Proton therapy offers dosimetric advantages over photon-based radiotherapy, particularly in sparing adjacent normal tissues. This study aims to systematically evaluate the effectiveness and safety of proton therapy for intracranial meningiomas across tumor grades and clinical scenarios. A systematic review and meta-analysis was conducted according to PRISMA 2020 guidelines using PubMed, EMBASE, Scopus, Web of Science, and Cochrane from inception to November 10, 2025. Studies were eligible if they reported clinical outcomes of proton therapy in ≥ 10 adult meningioma patients. Data extraction and risk-of-bias assessment were performed independently by two reviewers. Pooled complication rates and survival outcomes were calculated using random-effects models. Nineteen studies involving 1,431 patients were included. WHO Grade I tumors comprised 70.6% of cases; Grades II/III made up 25.2% and 4.2%, respectively. The most common proton dose regimens ranged from 13 to 70.2 Gy (RBE). The pooled complication rate was 16% (95% CI 5-27; p < 0.001; I² = 98.5%). Nine studies reported a statistically significant 5-year overall-survival proportion of 91% (95% CI 88-94; p < 0.001; I² = 49.3%). Radiologic local control averaged 71% (95% CI 50-86; I² = 88.2%). Proton therapy provides effective tumor control with acceptable toxicity, especially for low-grade or anatomically complex meningiomas. It is a valuable option for select patients, though further prospective studies are needed to optimize dosing and assess long-term outcomes.

References

1. 1.Wijaya, J. H., Elashry, A. R., Javaid, S., Khaled, M., Jibu, B., Narayanan, B., Perez-Chadid, D. A., Azmi, A., Avila-Madrigal, J. P., Ginalis, E. E., & Nanda, A. (2026). Effectiveness and safety of proton therapy in intracranial meningioma treatment: a systematic review and meta-analysis. Neurosurgical Review. https://doi.org/10.1016/s0360-3016(02)02823-7