Influence of the breast prosthesis volume in dose distribution in radiotherapy planning

Authors

Keywords:

radiotherapy, breast neoplasms, breast implants, mammaplasty

Abstract

Introduction: The challenge of modern radiotherapy (RT) in breast cancer is to maintain its satisfactory oncological results, adapting to oncoplastic surgery and avoiding possible cosmetic damage. Considering that the breast prosthesis is not a target volume in RT planning, this study sought to analyze the effect of this volume on the coverage of the clinical target volume (CTV) of the breast. Methods: We performed a retrospective analysis of plans in 48 patients who submitted to RT in the first half of 2014. Two volumes were measured, such as breast CTV (breast tissue with the prosthesis) and real CTV (breast tissue excluding the prosthesis). The D95% values (dose that covers 95% of the volume) for each of them were verified and related to the volume of each one as well as the volume of breast prosthesis. Results: The analysis of the CTVs showed a significant difference between the mean volumes for the real CTV and breast CTV. While performing the CTV coverage, including the prosthesis, there is a perception that the dose covered 95% of the volume. Nevertheless, the analysis of the same plan after prosthesis volume exclusion revealed a difficulty in covering 95% of the breast tissue volume, indicating the interference of the prosthesis in therapy planning. Considering the dosimetric aspects, there were patients with real CTV values below the ideal dose of 47.5 Gy, after exclusion of implant volume.Conclusions: Our data reflected the volume of the prosthesis as an important variable that should be considered when planning adjuvant RT.

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Author Biographies

Paulo Victor Fonseca, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Danilo Salviano, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Laura Ercolin, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Fernanda Buongosto, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Allison Borges, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Francisco Américo Silveira Marcelino, Empresa Brasileira de Serviços Hospitalares

Empresa Brasileira de Serviços Hospitalares, Hospital de Clínicas, Universidade Federal de Uberlândia – Uberlândia (MG), Brazil.

Dayane Lima César, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Rose Marta dos Santos Silva, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Susan Ann McCloskey, UCLA Health Santa Monica Radiation Oncology

UCLA Health Santa Monica Radiation Oncology – Santa Monica (CA), United States.

Wanessa Fernanda Altei, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Alexandre Arthur Jacinto, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

Marcos Duarte de Mattos, Hospital de Amor de Barretos

Radiotherapy Department, Hospital de Amor de Barretos – Barretos (SP), Brazil.

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Published

2021-04-05

How to Cite

Fonseca, P. V., Salviano, D., Ercolin, L., Buongosto, F., Borges, A., Marcelino, F. A. S., … Mattos, M. D. de. (2021). Influence of the breast prosthesis volume in dose distribution in radiotherapy planning. Mastology, 31, 1–6. Retrieved from https://revistamastology.emnuvens.com.br/revista/article/view/310

Issue

Vol. 31 (2021)

Section

Original Articles

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Copyright (c) 2021 Paulo Victor Fonseca, Danilo Salviano, Laura Ercolin, Fernanda Buongosto, Allison Borges, Francisco Américo Silveira Marcelino, Dayane Lima César, Rose Marta dos Santos Silva, Susan Ann McCloskey, Wanessa Fernanda Altei, Alexandre Arthur Jacinto, Marcos Duarte de Mattos

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