Thyroid Abnormalities Associated With Exposure to Atmospheric Emissions of Radioactive Iodine

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00342693
Recruitment Status : Terminated
First Posted : June 21, 2006
Last Update Posted : April 5, 2018
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:


  • An inadequate filtering system at the Mayak nuclear weapons production facility in Ozyorsk, Russia, allowed the release of various radioactive materials, particularly I-131 (radioactive iodine) into the city's atmosphere during the 1950s.
  • A recent pilot study found a higher prevalence of thyroid nodules in Ozyorsk residents who were exposed to the radiation in childhood during years of heavy atmospheric emissions (1952-1953) than in children exposed in later years (between 1967 and 1991) when there were almost no radioactive releases.
  • Understanding the role of I-131 in the development of thyroid disease is important because I-131 is commonly used in medicine (e.g., to treat hyperthyroidism and thyroid cancer and to diagnose thyroid disease), and it is the major source of thyroid gland exposure in fallout from atomic bomb explosions, nuclear power plant accidents, and atmospheric venting from plutonium manufacturing facilities.


-To expand the pilot study to include 350 Ozyorsk residents who were exposed in childhood to moderate levels of radiation in order to evaluate thyroid disease in relation to the dose of I-131 exposure.


-People who were born and living in Ozyorsk, Russia between 1954 and 1955, the period of mild radioactive releases from the Mayak nuclear weapons plant.


  • Participants' thyroid gland and structure are examined with an ultrasound examination and blood tests.
  • Participants with a possible thyroid gland disorder are referred to specialists for additional diagnostic procedures.

Condition or disease
Thyroid Abnormalities

Detailed Description:

We plan to expand a completed pilot study that evaluated the prevalence of thyroid abnormalities in relation to childhood exposure to atmospheric emissions of radioactive iodines from the Mayak Nuclear Weapons Plant in Ozyorsk, Russia. The pilot study population was composed of a defined cohort of approximately 900 Ozyorsk residents who were born between January 1, 1952 and December 31, 1953. The exposed population was comprised of persons who lived in Ozyorsk during the years of heavy atmospheric releases (1952-1953). Members of the nonexposed group moved to Ozyorsk between 1967 and 1991, i.e. when there were almost no radioactive releases. Results from the pilot study suggest an elevated prevalence of thyroid nodules in the exposed population. Given the positive results from the pilot study and the US Department of Energy's (DOE) decision to fund a dose reconstruction project for the Ozyorsk population, we intend to expand the study to include an additional 350 people born and living in Ozyorsk between 1954 and 1955, i.e. exposed to moderate levels of radiation .

Methods similar to those used in the pilot study will be used in the expanded study. Members of the study population will be invited to participate in a special thyroid screening protocol when they come for their annual routine medical examination at the Ozyorsk automated dispensary system (ASDOC). The thyroid gland is clinically examined by two ASDOC physicians specifically trained in thyroid palpation. Thyroid abnormalities will be detected based on physical examinations, assessment of TSH levels, and ultrasound imaging. Biochemical laboratory tests, including Free T(4), and anti-thyroperoxidase antibodies will be assayed as necessary. Patients are sent to a consulting endocrinologist if the palpation, ultrasound or laboratory findings suggest a thyroid disorder. Fine needle aspiration (FNA) biopsy is performed when a tumor is suspected. Although the FNA is not be done as part of the study research, but rather as part of the regular Ozyorsk medical system, the results will be given to the study staff to help make diagnostic decisions. Patients with complicated thyroid disease will be referred to an experienced consulting thyroid specialist. Patients with diagnosed thyroid disease are treated within the regular medical system in Ozyorsk.

Study Type : Observational
Actual Enrollment : 360 participants
Official Title: Thyroid Abnormalities Associated With Protracted Childhood I-131 Exposure From Atmospheric Emissions From the Mayak Nuclear Plant in Russia
Study Start Date : February 21, 2006
Study Completion Date : September 3, 2013

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Thyroid Diseases

Information from the National Library of Medicine

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Ages Eligible for Study:   51 Years to 52 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
  • Eligibility Criteria:

Currently living and working in Ozyorsk, Russian Federation

Born and living in Ozyorsk between January 1954 and December 1955

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00342693

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Cancer Institute (NCI)
Principal Investigator: Martha Linet, M.D. National Cancer Institute (NCI)

Publications: Identifier: NCT00342693     History of Changes
Other Study ID Numbers: 999906103
First Posted: June 21, 2006    Key Record Dates
Last Update Posted: April 5, 2018
Last Verified: September 3, 2013

Keywords provided by National Institutes of Health Clinical Center (CC):
Thyroid Screening
Thyroid Gland

Additional relevant MeSH terms:
Thyroid Diseases
Congenital Abnormalities
Endocrine System Diseases