Proton beam therapy for pediatric ependymoma.

Area of Science:

• Pediatric Oncology
• Radiation Oncology
• Neuro-oncology

Background:

• Ependymoma is a common brain tumor in children.
• Current treatment options for pediatric ependymoma have limitations.
• Evaluating novel therapeutic approaches is crucial for improving outcomes.

Purpose of the Study:

• To assess the efficacy and safety of proton beam therapy (PBT) in pediatric patients diagnosed with ependymoma.
• To compare the radiation dose delivered to normal brain tissue between PBT and conventional photon radiotherapy.

Main Methods:

• Six pediatric patients (2-6 years old) with WHO grade 2 and 3 ependymoma received PBT post-surgery.
• Tumor doses ranged from 50.4-61.2 GyE (median, 56.7 GyE).
• Dosimetric comparison of PBT and photon radiotherapy on normal brain tissue was performed using simulated treatment planning CT images.

Main Results:

• All patients completed PBT, with a median follow-up of 24.5 months; all remained alive.
• One patient experienced local recurrence; common toxicities included alopecia and mild dermatitis, with no severe adverse events reported.
• Simulations indicated PBT halved the radiation dose to normal brain tissue compared to photon radiotherapy.

Conclusions:

• Proton beam therapy is a safe treatment for pediatric ependymoma, exhibiting no unique toxicities.
• PBT significantly reduces radiation exposure to surrounding healthy brain tissue.
• This modality offers a promising alternative for pediatric ependymoma treatment, potentially improving long-term outcomes.