Vol 14, No 1 (2011)
Research paper
Published online: 2011-07-12

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The influence of non-radioactive iodine (127I) on the outcome of radioiodine (131I) therapy in patients with Graves’ disease and toxic nodular goitre

Franciszek Rogowski, Saeid Abdelrazek, Piotr Szumowski, Anna Zonenberg, Adam Parfienczyk, Agnieszka Sawicka
Nucl. Med. Rev 2011;14(1):9-15.


BACKGROUND: The aim of the study was to achieve an effective target dose in the thyroid by increasing the effective half-life (Teff) of 131I by use of iodide (127I) two days after 131I therapy in patients with hyperthyroidism with low Teff.
MATERIAL AND METHODS: The study was carried out in two groups. Group A — 41 patients, and Group B — 14 patients, all the patients were with hyperthyroidism with Teff less than 3 days qualified for 131I therapy. Only group A patients received 600 μg of iodide a day for 3 days, two days after 131I therapy. Radioiodine uptake (RAIU) after 24 and 48 hours, thyroid scintiscan and ultrasonography were done before and after 12 months of 131I therapy.
RESULTS: In group A a significant increase was seen in the Teff (5 days on average) resulting in an increase in the energy target dose by 28% and 37%, in patients with Graves’ disease (GD) and toxic nodular goitre (TNG), respectively. After one year of therapy 50% of GD and 93% of TNG patients achieved euthyroidism; 28% of GD and 3% of TNG patients were in hypothyroidism. In Group B, all the patients had radioiodine treatment failure and received a second therapeutic dose of 131I.
CONCLUSIONS: Administration of 127I after 131I treatment can lead to an increase in its effective half-life. This will also increase the absorbed energy dose in thyroid tissue, thereby improving therapeutic outcome without administration of a higher or second dose of 131I. This may minimize whole-body exposure to radiation and reduces the cost of treatment.
Nuclear Med Rev 2011; 14, 1: 9–15

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