Nucl Med Mol Imaging.  2015 Dec;49(4):276-283. 10.1007/s13139-015-0361-1.

Correlation of Consecutive Serum Thyroglobulin Levels During Hormone Withdrawal and Failure of Initial Radioiodine Ablation in Thyroid Cancer Patients

• Yoon H
• Kim SH
• O JH
• Seo YY
• Lee Y
• Kim H
• Ryu J

• KMID: 2132232
• DOI: http://doi.org/10.1007/s13139-015-0361-1

Abstract

OBJECTIVE
The aim of this study was to evaluate the value of thyroglobulin (Tg) kinetics during preparation of radioiodine ablation for prediction of initial radioiodine ablation failure in thyroid cancer patients.
METHODS
Thyroid cancer patients after total thyroidectomy who underwent radioiodine ablation with 3-4 weeks of hormone withdrawal between May 2011 and January 2012 were included. Consecutive serum Tg levels 5-10 days before ablation (Tg1) and on the day of ablation (Tg2) were obtained. The difference between Tg1 and Tg2 (DeltaTg), daily change rate of Tg (DeltaTg/day) and Tg doubling time (Tg-DT) were calculated. Success of initial ablation was determined by the results of the follow-up ultrasonography, diagnostic radioiodine scan and stimulated Tg level after 6 to 20 months.
RESULTS
A total of 143 patients were included. Failed ablation was reported in 52 patients. Tg2 higher than 5.6 ng/ml and Tg-DT shorter than 4.2 days were significantly related to a high risk of ablation failure. DeltaTg and DeltaTg/day did not show significant correlation with ablation failure.
CONCLUSIONS
Thyroglobulin kinetics on consecutive blood sampling during hormone withdrawal may be helpful in predicting patients with higher risk of treatment failure of initial radioiodine ablation therapy in thyroid cancer patients.

Keyword

Papillary thyroid carcinoma; High-dose I-131 ablation therapy; Thyroglobulin doubling time; Therapeutic failure

MeSH Terms

Follow-Up Studies
Humans
Kinetics
Thyroglobulin*
Thyroid Gland*
Thyroid Neoplasms*
Thyroidectomy
Treatment Failure
Ultrasonography
Thyroglobulin