Clinical Insight on Proton Therapy for Paediatric Rhabdomyosarcoma

Area of Science:

• Radiation Oncology
• Paediatric Oncology
• Medical Physics

Background:

• Rhabdomyosarcoma (RMS) is a significant paediatric cancer requiring complex treatment strategies.
• Conventional photon therapy poses challenges in dose delivery and normal tissue sparing for paediatric patients.
• Proton Beam Therapy (PBT) offers unique physical properties for precise radiation delivery.

Purpose of the Study:

• To provide a comprehensive literature analysis on the use of Proton Beam Therapy (PBT) for paediatric rhabdomyosarcoma (RMS).
• To compare dosimetry, outcomes, and toxicity between PBT and photon therapy in RMS treatment.
• To evaluate the potential benefits and challenges of PBT for specific paediatric RMS patient groups.

Main Methods:

• Systematic literature review and comparative analysis of photon-proton dosimetry.
• Evaluation of treatment outcomes and toxicity profiles reported in existing studies.
• Analysis of PBT's applicability based on tumour location and patient age.

Main Results:

• Clear therapeutic superiority of PBT over modern photon techniques is not yet definitively established for RMS.
• PBT demonstrates potential for significant normal tissue dose reduction due to its depth-dose characteristics.
• PBT may allow for dose escalation to the tumour while sparing surrounding healthy tissues.

Conclusions:

• PBT is a viable and excellent treatment option for paediatric RMS, particularly for young children and specific primary sites (head/neck, genitourinary, pelvic, paravertebral).
• The physical advantages of PBT can lead to improved local control, reduced toxicity, and enhanced quality of life.
• Limited availability of PBT facilities remains a significant challenge for wider patient access.