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Do Thyroid Cancer Patients with Basal Undetectable Tg Measured by Current Immunoassays Require rhTSH Testing?
MedLine Citation:
PMID:  21264807     Owner:  NLM     Status:  Publisher    
OBJECTIVE: To evaluate the predictive value of disease free status of basal thyroglobulin (Tg) in differentiated thyroid carcinoma (DTC). DESIGN: Basal and recombinant human TSH (rhTSH) stimulated Tg measured with a commercial immunoassay (Liaison DiaSorin, Italial), neck ultrasonography (US) and fine needle aspiration cytology if required were performed in DTC patients followed prospectively for 6.8 years in a university hospital. 92 consecutive DTC patients were included. 74 patients with basal and stimulated Tg <1.0 ng/ml and Tg antibodies and US negative were considered as disease-free and persistent/recurrent disease was detected in 18 patients. In 25/74 disease-free patients rhTSH test was repeated within one year. RESULTS: 63/92 patients had undetectable basal Tg (<0.5 ng/ml), with rhTSH-Tg <0.5 ng/ml in 52, in 6 rhTSH-Tg between 0.5 and 1 ng/ml, in 2 between 1-2 ng/ml (disease-free after 3 years of follow-up) and >2.0 ng/ml (mean 4.1±2.4 ng/ml) in another 3, with US lymphatic metastasis confirmed histologically. Disease-free state was predicted with a sensitivity (S) of 66.7% and specificity (Sp) of 75.7% for basal Tg-0.5 ng/ml, and S 100% and Sp 85.1% for stimulated Tg-0.92. rhTSH test and US were repeated within one year in 25 disease-free patients with Tg<1.0 ng/ml. No further elevation below 1 ng/ml was observed. CONCLUSIONS: Low risk patients with undetectable basal Tg measured with current commercially available immunoassays should be followed with at least one rhTSH stimulated Tg and neck US because of the insufficient predictive value for recurrence/persistent disease of basal Tg.
G Díaz-Soto; M Puig-Domingo; I Martínez-Pino; J Martínez de Osaba; F Rioera-Fillat; J Halperin
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-1-24
Journal Detail:
Title:  Experimental and clinical endocrinology & diabetes : official journal, German Society of Endocrinology [and] German Diabetes Association     Volume:  -     ISSN:  1439-3646     ISO Abbreviation:  -     Publication Date:  2011 Jan 
Date Detail:
Created Date:  2011-1-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9505926     Medline TA:  Exp Clin Endocrinol Diabetes     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© J. A. Barth Verlag in Georg Thieme Verlag KG Stuttgart · New York.
Servei de Endocrinologia i Nutrició, Hospital Clínic, Barcelona, Spain.
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