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Chornobyl Incident Proved Increased Risk of Thyroid Cancer from Radioactive Iodine

by Medindia Content Team on  July 5, 2006 at 11:19 AM Cancer News   - G J E 4
Chornobyl Incident Proved Increased Risk of Thyroid Cancer from Radioactive Iodine
As an added value to the several previous studies, Geoffrey R. Howe, Ph.D., of Columbia University in New York, and his colleagues have revealed that exposure to radioactive substances increased cancer risks in teens and kids.
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After the chornobyl radiation-accident, a study conducted to examine the cancer prevalence showed an increased risk of thyroid cancer in children and adolescents who are exposed to radioactive iodine.

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In 1986, an accident at the Chornobyl nuclear power plant exposed large numbers of people in Belarus, Ukraine, and the Russian Federation to radioactive material high in isotopes of iodine and cesium. Numerous studies have shown that exposure to certain types of radiation increases the incidence of thyroid cancer in children and teens. However, few studies have examined the effects of exposure to radioactive iodines, and only three studies have examined cancer risk from the Chornobyl-related exposures.

Geoffrey R. Howe, Ph.D., of Columbia University in New York, and colleagues screened 13,127 people for thyroid cancer who at the time of the Chornobyl accident were under 18 and lived in highly contaminated areas of Ukraine. The researchers estimated each participant's individual radiation dose using thyroid radioactivity measurements made shortly after the accident and interview data obtained during screening.

The researchers found 45 cases of thyroid cancer in the screened group in comparison with the 11.2 cases expected without the accident. Subjects had a tendency toward lower risk of thyroid cancer with increasing age at the time of the exposure. The authors suggest that exposure to radioactive fallout from the Chornobyl accident increased thyroid cancer in those exposed as children and adolescents.

The authors write, 'We estimate that 75% of the thyroid cancer cases would have been avoided in the absence of radiation. With appropriate adjustment for dose, this estimate demonstrates a substantial contribution of radioactive iodines to the excess of thyroid cancer that followed the Chornobyl accident.'

Source: Eurekalert
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