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Risk Factors for Indeterminate Response After Radioactive Iodine Therapy in Patients With Differentiated Thyroid Cancer

Jeong, E | Yoon, JK  | Lee, SJ  | Soh, EY  | Lee, J  | An, YS
Clinical nuclear medicine, 44(9). : 714-718, 2019
Journal Title
Clinical nuclear medicine
PURPOSE: We investigated the risk factors of indeterminate response (IDR) in patients who underwent recombinant human thyroid-stimulating hormone (rhTSH)-aided radioactive iodine therapy (RAIT).
METHODS: A total of 128 patients with papillary thyroid cancer were included in this retrospective study. The patients were classified into excellent response and IDR groups based on follow-up diagnostic whole-body scintigraphy (WBS) and TSH-stimulated thyroglobulin (Tg). Indeterminate response was defined as the presence of a faint uptake in the thyroid bed on the diagnostic WBS or a TSH-stimulated Tg detectable, but less than 10 ng/mL. Parameters that act as significant risk factors for IDR, including age, sex, stage, surgeon, time interval between surgery and RAIT, post-treatment WBS finding, urine iodine-to-creatinine ratio, TSH-unstimulated Tg, and rhTSH-stimulated Tg, were analyzed using a Cox proportional hazards regression method.
RESULTS: After treatment, 64 patients showed IDR. Recombinant human TSH-stimulated Tg was the only independent risk factor for predicting IDR. Patients with an rhTSH-stimulated Tg greater than 2 ng/mL prior to RAIT were 3.75 times more likely (95% confidence interval, 1.61-8.72) to have an IDR than those with a lower rhTSH-stimulated Tg (CONCLUSIONS: Pre-RAIT TSH-stimulated Tg levels are a risk factor for IDR after RAIT.

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Journal Papers > School of Medicine / Graduate School of Medicine > Nuclear Medicine & Molecular Imaging
Journal Papers > School of Medicine / Graduate School of Medicine > Surgery
Ajou Authors
소, 의영  |  안, 영실  |  윤, 준기  |  이, 수진  |  이, 정훈
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