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JOURNAL ARTICLE

Combination of initial stimulation thyroglobulins and staging system by revised ATA guidelines can elaborately discriminate prognosis of patients with differentiated thyroid carcinoma after high-dose remnant ablation

Min-Hee Kim, Sun Hee Ko, Ja-Seong Bae, Dong-Jun Lim, Ki-Hyun Baek, Jong-Min Lee, Moo-Il Kang, Bong-Yun Cha
Clinical Nuclear Medicine 2012, 37 (11): 1069-74
22996253

PURPOSE: The aim of this study was to evaluate prognostic role of thyroglobulin (Tg) levels at the time of ablation (A-Tg) and stimulation Tg levels at 6-12 months after remnant ablation (S-Tg) combined with revised American Thyroid Association (ATA) guidelines risk stratification.

PATIENTS AND METHODS: Data of 359 patients (median follow-up duration: 66.3 months) with papillary thyroid carcinoma who had high-dose remnant ablation were analyzed. The cutoff value of A-Tg to predict the persistent/recurrent disease was calculated by receiver operating characteristic curve analysis. In each risk group by ATA guidelines, the association of A-Tg with persistent/recurrent disease was evaluated. The role of A-Tg and ATA risk stratification in each S-Tg group (group with S-Tg <2 ng/mL, 2-10 ng/mL, or >10 ng/mL) was also evaluated. Tg response was determined by the difference between A-Tg and S-Tg with consideration of the dose of radioactive iodine ablation.

RESULTS: A-Tg above 5.22 ng/mL was associated with persistent/recurrent disease in all risk groups by ATA guidelines. A-Tg above the cutoff value and ATA risk assessment was related to persistent/recurrent disease in patients with S-Tg 2 to 10 ng/mL (P = 0.003) and S-Tg above 10 ng/mL (P = 0.019). However, no difference in the incidence of persistent/recurrent disease was found according to Tg response. The scoring system made up of A-Tg, S-Tg, and ATA staging showed elaborate discrimination of prognosis.

CONCLUSION: Risk stratification using combined scoring with initial stimulated Tg levels, including A-Tg and S-Tg, and staging system by revised ATA guidelines can effectively predict persistent/recurrent disease in patients with papillary thyroid carcinoma.

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