Abstract
Preablative-stimulated thyroglobulin (ps-Tg) has manifested its potential for predicting prognosis in patients with differentiated thyroid carcinoma (DTC), but its level can be affected by thyrotropin (TSH). The objective of this study was to evaluate the utility of ps-Tg in predicting individual response after radioactive iodine (RAI) therapy, and further explore the appropriate TSH level for ps-Tg to serve as a prognostic marker in DTC without initial distant metastasis (DM). A total of 208 consecutive non-DM DTC patients with serial ps-Tg, TSH, and anti-Tg antibody (TgAb) measured simultaneously were enrolled. The initial and last measurements of ps-Tg were marked as Tg1 and Tg2, respectively, with a median interval of 8 days, so does TSH. Clinical response was retrospectively evaluated as excellent, indeterminate, biochemical incomplete, or structural incomplete response (ER, IDR, BIR, or SIR) after a mean follow-up of 21.5 months. Tg1 and Tg2 were tested and compared for their performances in predicting ER and incomplete response (IR, including BIR and SIR) by receiver operating characteristic (ROC) curve analysis. The 416 ps-Tg levels (Tg1 and Tg2) were then categorized by their corresponding TSH grouping of 30-<60 (n = 1...Continue Reading
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