[Proton therapy for head and neck cancers].

Area of Science:

• Radiation Oncology
• Medical Physics

Background:

• Proton therapy offers dosimetric superiority over photon radiotherapy due to its finite range and sharp lateral penumbra.
• Intensity-modulated proton therapy (IMPT) shows reduced integral dose and organ-at-risk dose compared to intensity-modulated radiotherapy (IMRT).

Purpose of the Study:

• To review the characteristics of proton therapy.
• To analyze clinical data for head and neck cancer patients treated with proton therapy.
• To discuss patient selection and uncertainties associated with proton therapy.

Main Methods:

• Literature review of dosimetric comparisons and clinical outcomes.
• Analysis of studies focusing on head and neck cancers.
• Evaluation of toxicity and survival data.

Main Results:

• IMPT significantly reduces dose to critical structures like the anterior oral cavity, posterior fossa, visual apparatus, and swallowing structures.
• Clinical data suggest reduced toxicities such as weight loss and need for feeding tubes with IMPT.
• Patient survival is comparable to IMRT, with potential advantages in base of skull or sinonasal malignancies.

Conclusions:

• Proton therapy, especially IMPT, provides significant dosimetric benefits for head and neck cancers, translating to improved clinical outcomes and potentially better survival in select cases.
• Careful patient selection and understanding of physical and biological uncertainties are crucial for optimizing proton therapy efficacy.