Particle Beam Radiation Therapy for Skull Base Sarcomas

Area of Science:

• Oncology
• Radiation Oncology
• Medical Physics

Background:

• Skull base sarcomas are rare and challenging tumors.
• Particle beam radiation therapy offers advanced treatment options.

Purpose of the Study:

• To evaluate the clinical outcomes of carbon-ion and proton radiation therapy for skull base sarcomas.
• To analyze survival rates, local relapse-free survival, distant metastasis-free survival, progression-free survival, and overall survival.
• To identify prognostic indicators and assess treatment-related toxicities.

Main Methods:

• Retrospective analysis of a registry from Shanghai Proton and Heavy Ion Center.
• Inclusion of 62 patients with various skull base sarcoma subtypes treated between July 2014 and May 2019.
• Analysis of survival rates, toxicities, and prognostic factors using multivariate analysis.

Main Results:

• 1- and 2-year overall survival rates were 91.2%/80.2%, and progression-free survival rates were 75.8%/62.9%.
• Low rates of severe acute and late toxicities were observed, with one case of grade 5 hemorrhage.
• Lack of prior radiotherapy, age under 40, and early T-stage (T1/2) were favorable prognostic factors.

Conclusions:

• Particle beam radiation therapy demonstrates effective tumor control and survival benefits for skull base sarcomas.
• The treatment is associated with a favorable toxicity profile.
• Prognostic factors such as prior RT, age, and T-stage significantly influence patient outcomes.