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Evaluating dose to thyroid gland in women with breast cancer during radiotherapy with different radiation energies at supraclavicular fossa region

Published online by Cambridge University Press:  23 July 2018

Marjaneh Mirsadraei ,
Mehdi Seilanian Toosi ,
Shokoufeh Mohebbi  and
Hojjat Khalili-Hezarjaribi
Marjaneh Mirsadraei
Affiliation:
Research Department, Reza Radiotherapy and Oncology Center, Mashhad, Islamic Republic of Iran
Mehdi Seilanian Toosi
Affiliation:
Research Department, Reza Radiotherapy and Oncology Center, Mashhad, Islamic Republic of Iran
Shokoufeh Mohebbi
Affiliation:
Research Department, Reza Radiotherapy and Oncology Center, Mashhad, Islamic Republic of Iran
Hojjat Khalili-Hezarjaribi*
Affiliation:
Research Department, Reza Radiotherapy and Oncology Center, Mashhad, Islamic Republic of Iran
*
Author for correspondence: Hojjat Khalili-Hezarjaribi, Research Department, Reza Radiotherapy and Oncology Center, Mashhad, Islamic Republic of Iran. Tel: +985135224472; E-mail: hojjatkhalili@rroc.ir
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Abstract

Background and aim

During the treatment of breast cancer, radiotherapy to the supraclavicular fossa region results in absorption of radiation by the thyroid gland and consequently leads to hypothyroidism in 40% of patients. The aim of this study was to compare thyroid gland radiation absorption during radiotherapy with different anterioposterior beam radiation of 6–15 and 15–15 MV photon beam energies.

Materials and methods

In total, 29 patients with breast cancer were recruited to this study. Adjuvant radiotherapy with a total dose of 50 Gy was performed for each participant. Thyroid gland dosimetric measurements were evaluated including, mean dose, minimum and maximum dose, and V20, V30, V40 and V50 (percentage of thyroid volume receiving ≥20, ≥30, ≥40 and ≥50 Gy, respectively). The irradiation delivered doses were measured using Prowess Panther treatment planning system (Version 5.5). All data were evaluated using SPSS software.

Results

In total, 29 subjects with mean age of 53·4±9·4 were studied. According to the obtained results, at 15–15 MV energies, a significantly lower dose was absorbed by the thyroid gland, was observed in contrast to their counterparts who were treated with 6–15 MV photon beam energies.

Findings

Using 15–15 MV photon beam energies field can significantly reduce the absorbed dose to the thyroid gland and consequently can reduce the risk of developing hypothyroidism in breast cancer patients treated with radiotherapy.

Keywords

breast cancerhypothyroidismradiotherapysupraclavicular fossa radiationthyroid gland irradiation
Type
Original Article
Information
Journal of Radiotherapy in Practice , Volume 17 , Issue 4 , December 2018 , pp. 373 - 376
Copyright
© Cambridge University Press 2018 

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