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Smallridge, R.C. et al.

Smallridge, Meek, Morgan, Gates, Fox, Grebe, Fatourechi,

Monitoring Thyroglobulin in a Sensitive Immunoassay Has Comparable Sensitivity to Recombinant Human TSH- Stimulated Thyroglobulin in Follow-Up of Thyroid Cancer Patients.

Context: Most thyroglobulin ( Tg) assays have a sensitivity of 0.5-1 ng/ml. A minority of patients with undetectable T(4)-suppressed Tg levels have a recombinant human TSH (rhTSH)-stimulated Tg above 2 ng/ml and identifiable residual disease. Objective: The objective was to determine whether a Tg assay with improved sensitivity could eliminate the need for rhTSH stimulation when baseline Tg is below 0.1 ng/ml. Design: A retrospective study of two academic endocrine practices was conducted. Population: A total of 194 patients undergoing rhTSH stimulation participated in the study. Results: Of the 80 patients with Tg below 0.1 ng/ml, two (2.5%) had rhTSH-stimulated Tg above 2 ng/ml. One other patient with stimulation to 0.3 ng/ml and negative (123)I scan had an ultrasound-detected malignant lymph node resected. None had (131)I/(123)I imaging after rhTSH stimulation suggestive of local recurrence or distant metastasis. If T(4)-suppressed Tg was 0.1-0.5 or 0.6-2.0 ng/ml, rhTSH Tg was above 2 ng/ml in 24.2 and 82.4%, respectively. Conclusions: Patients with differentiated thyroid carcinoma and a T(4)-suppressed serum Tg below 0.1 ng/ml rarely have a rhTSH-stimulated Tg above 2 ng/ml, and none of these patients had (131)I or (123)I imaging after rhTSH stimulation suggestive of local recurrence or distant metastasis. We recommend monitoring such patients with a T(4)-suppressed Tg level and periodic neck ultrasonography. An increase in T(4)-suppressed serum Tg to a detectable level or the appearance of abnormal lymph nodes by physical or ultrasound exam should prompt further investigation.[1]

References

Monitoring Thyroglobulin in a Sensitive Immunoassay Has Comparable Sensitivity to Recombinant Human TSH-Stimulated Thyroglobulin in Follow-Up of Thyroid Cancer Patients. Smallridge, R.C., Meek, S.E., Morgan, M.A., Gates, G.S., Fox, T.P., Grebe, S., Fatourechi, V. J. Clin. Endocrinol. Metab. (2007) [Pubmed]

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