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Clinical experience with electron pseudoarc therapy
M R McKenzie1, C R Freeman, M Pla
1Department of Oncology (Division of Radiation Oncology), McGill University Montréal, Québec, Canada.
The British Journal of Radiology
|March 1, 1993
Summary
Electron pseudoarc therapy showed mixed results for palliative breast carcinoma treatment, with significant side effects. It may offer better outcomes for curative intent in other superficial curved surface tumors.
Area of Science:
- Radiation Oncology
- Medical Physics
- Oncology
Background:
- Electron pseudoarc therapy is an advanced radiation technique.
- Its application in treating extensive chest wall disease, particularly breast carcinoma, requires evaluation.
- Assessing treatment efficacy and toxicity is crucial for patient selection.
Purpose of the Study:
- To evaluate the efficacy and toxicity of electron pseudoarc therapy.
- To assess its role in palliative treatment for locally extensive breast carcinoma.
- To explore its potential in radical treatment for various chest wall and scalp malignancies.
Main Methods:
- Retrospective analysis of 24 patients treated between November 1986 and June 1990.
- Patients received electron pseudoarc therapy for palliative (n=17) or radical (n=7) intent.
- Tumor response, local control, and treatment-related toxicities were documented.
Main Results:
- Palliative group: 8/17 complete response, 6/17 partial response; 9/17 experienced disease progression.
- Significant toxicity observed: 8/17 moist desquamation, 4/17 extensive; 2/17 radiation pneumonitis.
- Radical group: 6/7 achieved local control with minimal toxicity.
Conclusions:
- Electron pseudoarc therapy can palliate extensive chest wall breast carcinoma but with considerable morbidity.
- The technique shows promise for curative treatment of superficial malignancies on large curved surfaces.
- Careful patient selection is essential to optimize outcomes and manage potential side effects.