Clinical Investigation
Clinical value of TSH-stimulated thyroglobulin in evaluation of metastasis from differentiated thyroid carcinoma after 131I treatment
Li Xiali, Wu Xinyu, Yan Xinhui, Wang Peng, Tang Minmin, Cui Jing, Li Xiaofei, Xu Junling, Gao Yongju
Published 2017-03-25
Cite as Chin J Nucl Med Mol Imaging, 2017, 37(3): 153-156. DOI: 10.3760/cma.j.issn.2095-2848.2017.03.006
Abstract
ObjectiveTo investigate the critical value of TSH-stimulated Tg(sTg) in the diagnosis of metastasis from DTC, and to evaluate the diagnostic value of the ratio of sTg to suppressed Tg (sTg/suppressed Tg).
MethodsA total of 330 post-operative DTC patients(87 males, 243 females, age range: 12-70 years)who underwent thyroid remnant ablation from August 2008 to December 2014 were retrospectively reviewed. Their serum TgAb levels were normal. The patients were divided into non-metastasis group(147 cases)and metastasis group(183 cases) according to results of ultrasonography, CT and WBS. The difference of sTg between the two groups were compared by Mann-Whitney rank sum test. ROC curve was used to analyze the relationship between sTg, sTg/suppressed Tg ratio and metastasis, the cutoff value was calculated.
ResultsThe sTg was significantly different between the non-metastasis group and metastasis group: 1.0 (0.1, 2.0) μg/L vs 36.5 (3.9, 126.7) μg/L; u=-6.642, P<0.05. The AUC for ROC curve in metastasis group was 0.85, and the cutoff value was 2.05 μg/L, with the sensitivity 85.2%, specificity 67.3%, and accuracy 82.3%. While sTg<2.05 μg/L, the AUC of sTg/suppressed Tg ratio was 0.941, and the cutoff value was 4.3, with the sensitivity 93.3%, specificity 88.2%, and accuracy 92.3%.
ConclusionsThe sTg has a specific value for the diagnosis of metastasis from DTC after operation and the cutoff value is 2.05 μg/L in this set of patients. The ratio of sTg/suppressed Tg could be used to correct the sTg and to improve the diagnostic sensitivity.
Key words:
Thyroid neoplasms; Neoplasm metastasis; Radiotherapy; Iodine radioisotopes; Thyroglobulin
Contributor Information
Li Xiali
Department of Nuclear Medicine, Henan Provincial People′s Hospital &
People′s Hospital of Zhengzhou University, Zhengzhou 450003, China
Wu Xinyu
Yan Xinhui
Wang Peng
Tang Minmin
Cui Jing
Li Xiaofei
Xu Junling
Gao Yongju