Protons to replace photons in external beam radiation therapy?

Area of Science:

• Physics and Medicine
• Radiation Oncology

Background:

• Proton beams possess unique physical characteristics enabling superior radiation dose distribution compared to traditional photon beams.
• Proton therapy allows for precise dose sculpting, delivering a uniform dose to the target while minimizing dose to surrounding healthy tissues.

Purpose of the Study:

• To highlight the advantages of proton therapy in radiation oncology.
• To discuss the clinical applications and growing availability of proton therapy centers.

Main Methods:

• Comparative analysis of dose distribution characteristics between proton and photon beams.
• Review of clinical outcomes and treatment volumes in proton therapy applications.
• Assessment of the current and planned infrastructure for proton therapy centers.

Main Results:

• Proton beams facilitate uniform dose delivery to the target, with rapid dose fall-off beyond the target volume.
• This precise dose distribution leads to smaller treatment volumes, reduced normal tissue complications, and allows for higher tumor doses.
• Clinical benefits have been observed in uveal melanoma, skull-base sarcoma, sinonasal carcinomas, lung carcinoma, and hepatocellular carcinoma.

Conclusions:

• Proton therapy offers significant advantages in radiation oncology, including improved tumor control and reduced treatment-related morbidity.
• The expansion of proton therapy centers and ongoing clinical trials indicate its increasing importance in cancer treatment.
• Further prospective clinical evaluations are underway for a wide range of tumor types.