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Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Proton therapy for maxillary sinus carcinoma.

Bhishamjit S Chera¹, Robert Malyapa, Debbie Louis

¹Department of Radiation Oncology, University of Florida, Jacksonville, FL, USA.

American Journal of Clinical Oncology

|May 13, 2009

Summary

Three-dimensional conformal proton therapy (3DCPT) and intensity-modulated radiotherapy (IMRT) both adequately target paranasal sinus tumors. 3DCPT lowers normal tissue dose, but both methods risk irradiating ipsilateral optic structures.

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Area of Science:

Radiation Oncology
Medical Physics
Oncology

Background:

Paranasal sinus malignancies require precise radiation delivery to maximize tumor control while minimizing toxicity to surrounding critical structures.
Three-dimensional conformal proton therapy (3DCPT) and intensity-modulated radiotherapy (IMRT) are advanced radiation techniques with different dose distribution characteristics.

Observation:

Dose-volume data were compared between 3DCPT and IMRT for a T4N0 maxillary sinus carcinoma.
Target volume coverage was comparable between the two techniques.

Findings:

3DCPT demonstrated lower mean and integral doses to all normal tissues compared to IMRT.
However, both 3DCPT and IMRT plans resulted in maximum doses to ipsilateral optic structures (nerve, retina, lens), temporal lobe, pituitary, and brain that exceeded tolerance levels.

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Last Updated: Jun 23, 2026

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Proton Therapy Delivery and Its Clinical Application in Select Solid Tumor Malignancies

Published on: February 6, 2019

Contralateral organs like the parotid gland, lacrimal gland, and lens were spared by 3DCPT.

Implications:

While 3DCPT offers potential advantages in reducing overall normal tissue radiation exposure for paranasal sinus cancers, careful planning is crucial.
Both techniques require vigilant monitoring and potentially further optimization to prevent dose escalation to critical ipsilateral visual pathways.
Further research may explore advanced proton therapy techniques or dose constraints to mitigate risks to optic structures.