Research Article Preablation Stimulated Thyroglobulin/TSH Ratio as a Predictor of Successful I131Remnant Ablation in Patients with Differentiated Thyroid Cancer following Total Thyroidectomy

Copyright © 2014 Syed Zubair Hussain et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Background. About 90 % of thyroid cancers are differentiated thyroid cancers. Standard treatment is total thyroidectomy followed by radioactive I131remnant ablation and TSH suppression with thyroxine. Unsuccessful ablation drastically affects the prognosis of patients with DTC particularly high risk individuals; therefore, identifying the factors that affect the success of ablation is important in the management of patients with DTC. sTg is a good predictor of successful ablation in DTC. Its levels can be influenced by tumor staging andTSH values, as well as other factors.Therefore, we did this study using TSH to correct the predictive value of sTg in success of RRA. Methods. We retrospectively reviewed the records of 75 patients with DTC, who underwent total thyroidectomy followed by RRA and TSH suppression. Results. Preablation sTg and sTg/TSH ratio are significantly associated with ablation outcome. Cutoff value for sTg to predict successful and unsuccessful ablationwas 18 ng/mLwith 76.7 % sensitivity and 79.1% specificity, while for sTg/TSH cutoff was 0.35 with 81.4 % sensitivity and 81.5 % specificity