Proton-beam therapy for olfactory neuroblastoma

Area of Science:

• Radiation Oncology
• Medical Physics
• Oncology

Background:

• Olfactory neuroblastoma (ONB) is a rare malignancy with no established standard treatment.
• Radiation therapy for ONB is complex due to the tumor's proximity to critical organs.
• Proton-beam therapy (PBT) offers superior dose distribution compared to traditional X-ray therapy.

Purpose of the Study:

• To evaluate the feasibility and efficacy of PBT as a definitive treatment for olfactory neuroblastoma.
• To review preliminary clinical experience with PBT in ONB patients.

Main Methods:

• Retrospective review of 14 patients with ONB treated with PBT.
• PBT delivered a total dose of 65 Gy(E) in 2.5 Gy(E) daily fractions.
• Treatment was administered at the National Cancer Center Hospital East between November 1999 and February 2005.

Main Results:

• The 5-year overall survival rate was 93%.
• 5-year local progression-free survival was 84%, and 5-year relapse-free survival was 71%.
• One case of post-treatment liquorrhea occurred; most patients experienced mild (Grade 1-2) dermatitis. No severe adverse events (Grade 3+) were reported.

Conclusions:

• Preliminary PBT for ONB demonstrates excellent local control and survival outcomes.
• PBT is a safe and effective treatment modality for olfactory neuroblastoma.
• Further investigation of PBT for ONB is warranted.