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Optimum dose finding in radioiodine treatment of hyperthyroidism in Graves' disease

12-year prospective, randomised, open-label blinded endpoint study (PROBE) to estimate the optimum dose for radioiodine treatment of Graves' disease

Status
Active, not recruiting
Phases
Unknown
Study type
Interventional
Source
ISRCTN
Registry ID
ISRCTN62749892
Enrollment
600
Registered
2010-01-20
Start date
1997-04-20
Completion date
Unknown
Last updated
2015-01-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Graves' disease Nutritional, Metabolic, Endocrine Thyrotoxicosis [hyperthyroidism]

Interventions

Intervention group: Participants received one application of 131I (oral), followed by a second application after 3 months, if the first was unsuccessful. The dose/activity of 131I (in MBq) was determi

Sponsors

Sun Yat-Sen University (China)
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1. Newly diagnosed hyperthyroid patients diagnosed Graves' disease 2. Patients with Graves' disease and anti thyroid drugs after 2 weeks withdrawal 3. Elevated levels of a recent set of general serum and thyroid function tests, confirming hyperthyroidism 4. 24-hour 131I-uptake greater than or equal to 40% 5. If 131I-uptake less than 40%, restriction of food or drug rich in iodine, retest until uptake was greater than or equal to 40% 6. Aged 8 years to no age limit, males and females

Exclusion criteria

Exclusion criteria: 1. Severe liver or kidney damage 2. Agranulocytosis 3. Pregnancy or lactation 4. Less than 8 years of age

Design outcomes

Primary

MeasureTime frame
Assessed annually, that is every 12 months after first therapeutic intervention for each patient, ending year 12: 1. Euthyroidism 2. Hyperthyroidism 3. Recurrence 4. Hypothyroidism 5. Subclinical hypothyroidism

Secondary

MeasureTime frame
The sum dose of 131-radioiodine which was necessary to achieve therapeutic primary outcomes at the end of the study. It was assessed 3 months after inclusion and after a patient had administered or not a second treatment dose. The outcomes measure resulted from 5 groups of dose-ranges of radioiodine, beginning with a low dose-range and ending with a high dose-range. The individual dose to be adminstered was determined according to these 5 range groups modulated by a clinical 7 step score.

Countries

China

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026