Risk estimation of radiation-incuced thyroid cancer from treatment of brain tumors in adults and children

Mazonakis,M.; Damilakis,J.; Varveris,H.; Fasoulaki,M.; Gourtsoyiannis,N.

doi:10.3892/ijo.22.1.221

January 2003 Volume 22 Issue 1

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January 2003 Volume 22 Issue 1

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Article

Risk estimation of radiation-incuced thyroid cancer from treatment of brain tumors in adults and children

Authors:
- M. Mazonakis
- J. Damilakis
- H. Varveris
- M. Fasoulaki
- N. Gourtsoyiannis
View Affiliations / Copyright

Affiliations: Department of Medical Physics, University Hospital of Heraklion, Heraklion, Crete, Greece
Pages: 221-225
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Published online on: January 1, 2003

https://doi.org/10.3892/ijo.22.1.221
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Abstract

The purpose of this study was to estimate the risk of thyroid cancer induction attributable to brain radiation therapy in adult and pediatric patients. An anthropomorphic phantom was used to simulate treatment of brain tumors with two lateral opposed fields. Thyroid dose was measured using thermoluminescent dosimeters. Phantom measurements were performed for all possible field sizes that may be applied during brain radiotherapy in adults and children. The dependence of the thyroid dose on the distance from the irradiation field and on the presence of beam modifiers in the primary beam was investigated. All phantom exposures were generated with a 6 MV photon beam. Thyroid dose was found to vary from 9.6 to 89.4 cGy and from 8.0 to 194.0 cGy depending upon the field size used and the thyroid location in respect to the field edge for adults and children respectively. The excess relative risk of thyroid cancer induction for exposed children was estimated to be 0.6-14.9. The corresponding excess relative risk for adults was 0.1-1.1. The introduction of lead blocks or wedges into the primary beam may result in a considerable increase of the risk of thyroid cancer due to the increase of the thyroid dose. This study shows that brain radiotherapy during childhood may be associated with an increased risk of secondary thyroid cancer while the risk in adult patients is much smaller.

Journals

International Journal of Molecular Medicine

International Journal of Oncology

Molecular Medicine Reports

Oncology Reports

Experimental and Therapeutic Medicine

Oncology Letters

Biomedical Reports

Molecular and Clinical Oncology

World Academy of Sciences Journal

International Journal of Functional Nutrition

International Journal of Epigenetics

Medicine International

Risk estimation of radiation-incuced thyroid cancer from treatment of brain tumors in adults and children

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Abstract

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