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NCT00339716
Scientific Protocol for the Study of Thyroid Cancer and Other Thyroid Disease in Belarus Following the Chernobyl Accident
trial in Thyroid Cancer in 19,456 participants. Completed in 11 March 2020.
11 March 2020
Quick facts
| Lead sponsor | National Cancer Institute (NCI) |
|---|---|
| Status | Completed |
| Study type | OBSERVATIONAL |
| Enrollment | 19,456 |
| Start date | 21 March 1994 |
| Primary completion | 11 March 2020 |
| Estimated completion | 11 March 2020 |
| Sites | 2 locations across Belarus |
Conditions studied
- Thyroid Cancer — all drugs for Thyroid Cancer →
- Non-Cancer Thyroid Disease — all drugs for Non-Cancer Thyroid Disease →
- Non Thyroid Cancer — all drugs for Non Thyroid Cancer →
Sponsor
National Cancer Institute (NCI)
Who can join
Adults 30 to 51, any sex, with Thyroid Cancer or Non-Cancer Thyroid Disease. Patients with the condition only — healthy volunteers not accepted.
Sponsor's own description
Iodine-131(131I) and other radioisotopes of Iodine are contained in fallout from atmospheric nuclear weapons tests and are among the radionuclides most likely to be released in a nuclear reactor accident. In spite of nearly 50 years of experience, the risk of thyroid disease, especially thyroid cancer, attributable to exposure to 131I remains unknown, although the carcinogenic potential of x-ray and gamma-ray exposure of the thyroid is reasonably well known. The available data also indicate that children face greater risks of radiation-induced thyroid cancer than do adults. The nuclear power plant accident at Chernobyl released large quantities of 131I and other radioisotopes of iodine into the atmosphere, contaminating thousands of square kilometers and exposing millions of people. It is proposed that a well-defined subset of Belarussian children aged 0-18 years at the time of the accident be examined by well-trained specialists for thyroid disease at least biennially for up to 30 years. A cohort of 15,000 children has been identified, all of whom had their thyroids measured for radioactivity during the weeks immediately following the accident. Under a rigid research protocol these children will receive complete diagnostic thyroid examinations, including palpation, ultrasound scanning, thyroid hormone and other laboratory tests, and fine-needle aspiration, as appropriate. Cancer will be determined by expert pathology examination of tissue. In addition to the analysis of thyroid radiation measurements made in May-June, 1986, efforts will be made to reconstruct each person's exposure and to estimate the radiation doses to the thyroid. This will involve the reconstruction of deposition patterns and environmental pathways of the radioiodines, and of the location, dietary characteristics, and lifestyle of each person throughout the exposure period. The data will be analyzed to evaluate the relationship, if any, between thyroid disease, especially cancer, and the radiation dose to the thyroid, with emphasis on the dose from 131I. The primary focus will be on dose-response analyses of person-year incidence data with stratification by sex, age at exposure, geographic area, time, and age at risk. Confounding factors, e.g., use of potassium iodide (KI) as a prophylactic measure, will be evaluated and controlled in the analysis, and the uncertainty of the dose estimates will be taken into account. In addition to producing risk coefficients for thyroid cancer and other thyroid diseases in children as a function of sex and age at the time of exposure, it is expected that the analyses will contribute new knowledge of the carcinogenic effectiveness of 131I in comparison with that of x-ray and gamma radiation. This information will fill a major gap in the world's knowledge of radiation effects, and will provide guidance for radiation protection and public health policies wherever nuclear reactors are in operation.
Publications & conference data
No peer-reviewed publications indexed yet for this trial. Completed trials usually publish results within 12-18 months.
Verify or expand the search:
- PubMed search for NCT00339716
- Europe PMC full search
- ASCO Meeting Library
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- bioRxiv preprints
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Verify against primary sources
- ClinicalTrials.gov — authoritative US registry record
- WHO ICTRP — international registry index
- EU Clinical Trials Register
- Sponsor press releases (Google)
- Trial protocol + status: ClinicalTrials.gov NCT00339716 (US National Library of Medicine, public domain)
- Drug + disease cross-links: matched in real time against Drug Landscape's normalised drug + company + condition tables
- Sponsor: as reported to ClinicalTrials.gov by National Cancer Institute (NCI)
- Last refreshed: 16 March 2020
Drug Landscape aggregates and links these public records for informational use only. Always verify against the primary source before clinical or regulatory decisions. Canonical URL: https://druglandscape.com/trial/NCT00339716.
Primary sources · FDA · ClinicalTrials.gov · EMA · SEC EDGAR · ChEMBL · Wikidata · full sourcing