© 2004 Foundation for Promotion of Cancer Research
Short Communication |
Comparison of the Effectiveness Between a Single Low Dose and Fractionated Doses of Radioiodine in Ablation of Post-operative Thyroid Remnants
1 Department of Nuclear Medicine, 2 Division of Endocrinology and Metabolism, and 3 Department of Otorhinolaryngology, Changhua Christian Hospital, Changhua, Taiwan
For reprints and all correspondence: Guang-Uei Hung, Department of Nuclear Medicine, Changhua Christian Hospital, 135 Nansiao street, Changhua 500, Taiwan. E-mail: 106143{at}cch.org.tw
Received February 26, 2004; accepted May 20, 2004
Due to the lack of radiation isolation wards in most hospitals in Taiwan, high-dose (exceeding 30 mCi) radioiodine therapy is usually performed in a fractionated manner (successively administering multiple low doses). This study compared the ablating efficacies of post-operative thyroid remnants using a single low dose (30 mCi) and fractionated doses (four doses of 30 mCi given at weekly intervals) in 59 patients with differentiated thyroid cancer who received total or near-total thyroidectomy. Successful ablation was obtained in 20 of 38 patients (52.6%) treated with a single low dose compared with 14 of 21 patients (66.7%) treated in a fractionated manner. There was no statistically significant difference between these two treatment protocols (P = 0.296). As the fractionated-dose protocol has the drawbacks of a much longer hypothyroid state and a higher total expense, we suggest that a single low dose is more feasible than fractionated doses for outpatient ablation therapy.
Key Words: thyroid carcinoma postoperative ablation radioiodine therapy thyroid stunning
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