Abstract
Objective
To investigate predictors for successful ablation and disease-free status after high-dose radioiodine therapy in patients with differentiated thyroid cancer.
Methods
We enrolled 173 consecutive patients with differentiated thyroid cancer between November 2001 and December 2004 retrospectively (female 145, 46 ± 12 years). All patients underwent total thyroidectomy and I-131 ablative therapy (IAT) (3.7–5.4 GBq). The success or failure of ablation was assessed 6–9 months after the IAT with reference to undetectable thyroglobulin (Tg) and negative I-131 whole body scan (WBS). Afterward, the decision for disease-free status was evaluated using Tg and WBS (follow-up period after 1st IAT 7–81 months, median 43 months, criteria of disease-free: less than 10 ng/ml TSH-stimulated Tg or less than 2 ng/ml TSH-unstimulated Tg and/or negative WBS). Clinical and tumoral factors such as sex, age, pathologic type, the size of tumor, quantified cervical uptake in WBS1, pattern in WBS1, ablative therapy dose, AJCC stage, lymph node (LN) stage, Tg just before IAT (Tg1), and ablation status were assessed using logistic regression analyses.
Results
There were 93 successful ablations (54 %). Significant predictors for the ablation failure were Tg1 (OR = 8.42; 95 % CI = 2.76–25.69; p < 0.0001), LN metastasis (OR = 3.05; 95 % CI = 1.11–8.37; p = 0.031), and quantified cervical uptake in WBS1 (OR = 4.95; 95 % CI = 1.07–22.88; p = 0.041). One hundred fifty-five patients were determined as disease-free after follow-up. All the eighteen patients with persistent disease were identified as ablation failure after first IAT. Significant predictors for the disease-free status were Tg1 (OR = 0.98; 95 % CI = 0.97–0.99; p = 0.028), tumor size (OR = 0.53; 95 % CI = 0.28–0.96; p = 0.044), and quantified cervical uptake in WBS1 (OR = 0.87; 95 % CI = 0.76–0.98; p = 0.024).
Conclusions
The thyroglobulin and quantified cervical uptake in whole body scan are significant predictors for the successful ablation and disease-free status after follow-up.
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Acknowledgments
This research was supported partly by a grant from the National Cancer Center (0910030) and by the Bio & Medical Technology Development Program of the National Research Foundation (NRF) funded by the Korean government (MEST) (2011-0019794). The authors declare that they have no conflict of interest. The authors thank Mr. Woo Jae Won, and Mr. Young Seok Kim for their excellent technical and generous support.
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Lim, I., Kim, Sk., Hwang, Ss. et al. Prognostic implication of thyroglobulin and quantified whole body scan after initial radioiodine therapy on early prediction of ablation and clinical response for the patients with differentiated thyroid cancer. Ann Nucl Med 26, 777–786 (2012). https://doi.org/10.1007/s12149-012-0640-1
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DOI: https://doi.org/10.1007/s12149-012-0640-1