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Biological Effects of Radiation

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All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...

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Computer-Aided Three-Dimensional Visualization in the Treatment of Locally Advanced Thyroid Cancer

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Thyroid cancer after external or internal ionizing irradiation.

Foteini Papadopoulou¹, Elias Efthimiou

¹Endocrinology Clinic, Panagia General Hospital, Thessaloniki, Greece. gastaris@otenet.gr

Hellenic Journal of Nuclear Medicine

|November 26, 2009

Summary

High-dose ionizing radiation significantly increases thyroid cancer risk, especially in children and adolescents. The Chernobyl accident demonstrated this, with the highest risks observed in young children, and papillary thyroid cancer being typical in this age group.

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An Orthotopic Mouse Model of Anaplastic Thyroid Carcinoma

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Area of Science:

Endocrinology
Oncology
Radiation Biology

Background:

Thyroid cancer risk is well-established following childhood exposure to high-dose ionizing radiation.
Epidemiological studies confirm thyroid cancer induction in children treated with head and neck radiotherapy.
The World Health Organization (WHO) highlights elevated thyroid cancer risk post-Chernobyl, particularly in young children.

Purpose of the Study:

To summarize the impact of ionizing radiation on thyroid cancer incidence, focusing on age-dependent risks.
To discuss the characteristics of Chernobyl-induced thyroid cancers, including common types and genetic mutations.
To outline current treatment modalities and protective measures for radioactive iodine exposure.

Main Methods:

Review of epidemiological studies on radiation-induced thyroid cancer.
Analysis of Chernobyl accident data regarding thyroid cancer incidence across different age groups.
Summary of research on gene mutations in radiation-induced thyroid tumors.
Description of standard treatment protocols and preventative strategies.

Main Results:

Thyroid cancer risk from ionizing radiation is highest in children and adolescents.
The Chernobyl accident led to significant increases in thyroid cancer cases: 87.8-fold in children, 12.7-fold in adolescents, and 4.5-fold in adults within 15 years.
Papillary thyroid cancer, typical in childhood and adolescence, accounts for approximately 80% of cases.
Gene mutations in Chernobyl-induced thyroid tumors have been extensively studied.

Conclusions:

Ionizing radiation exposure, particularly in childhood, poses a significant thyroid cancer risk.
Chernobyl-related thyroid cancer incidence varied by age, with the youngest most affected.
Effective treatments include surgery, thyroxine suppression, and radioiodine, with potassium iodide offering protection against radioactive iodine intake.