Abstract
Background
Although differentiated thyroid carcinoma (DTC) rarely develops distant metastases, the present study was performed to evaluate factors that affect the survival of patients with DTC who present with distant metastasis.
Methods
Among 4,989 patients who underwent thyroid surgery for DTC, 82 presenting with distant metastasis were analyzed. Based on radioiodine (131I) avidity and the thyroid-stimulating hormone-stimulated serum thyroglobulin (sTg) level at the time of metastasis, patients were divided into three groups: group 1 (131I uptake + sTg ≤ 215 ng/mL, n = 46), group 2 (131I uptake + sTg > 215 ng/mL, n = 24), group 3 (no 131I uptake, n = 12). Disease-specific survival (DSS) was estimated using the Kaplan–Meier method. Factors predicting the outcome were evaluated using Cox proportional hazard regression analysis.
Results
The age of patients (p = 0.04), frequency of follicular thyroid carcinoma (p = 0.002), tumor size (p < 0.001), and number of multiple metastatic sites (p = 0.004) differed significantly among the groups. With a median follow-up after surgery of 72 months, the 5- and 10-year DSSs for all patients were 84 and 69 %, respectively. The predictors of survival were age (p = 0.004), symptoms at the time of presentation (p = 0.045), histology (p = 0.01), sites of metastasis (p = 0.03), and 131I avidity and sTg level at the time of metastasis (p = 0.002). In the multivariate analysis, age, histology, and 131I avidity and sTg level at the time of metastasis remained significant factors for survival.
Conclusions
Certain DTC patients with distant metastasis demonstrate favorable outcomes dependent on age, histology, and 131I avidity and sTg level at the time of metastasis.
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Acknowledgments
This study was supported by 2012 SMC Clinical Research grant (CR0112101), the Korean Foundation for Cancer Research (CB-2011-03-02), and the Samsung Biomedical Research Institute grant (SBRI C-B0-233-3).
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Kim, H.J., Lee, J.I., Kim, N.K. et al. Prognostic Implications of Radioiodine Avidity and Serum Thyroglobulin in Differentiated Thyroid Carcinoma with Distant Metastasis. World J Surg 37, 2845–2852 (2013). https://doi.org/10.1007/s00268-013-2213-4
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DOI: https://doi.org/10.1007/s00268-013-2213-4