Abstract
Purpose
Recurrences are frequent in thyroid cancer patients and long-term follow-up is therefore necessary. We evaluated the yield of rhTSH stimulation in three groups of patients, classified according to the UICC/TNM risk stratification and the results of first follow-up testing.
Methods
The study population comprised 129 patients referred for rhTSH testing. All had undergone first follow-up testing after thyroid hormone withdrawal (off-T4) within 1 year of 131I ablation. Negative first follow-up testing was defined as Tg <2 ng/ml and no neck uptake on 131I diagnostic whole-body scan. Seventy-five patients had stage I thyroid cancer and negative first follow-up testing (group A), 19 had stage I disease and positive first follow-up testing (group B), and 35 had stage II–IV disease (group C). RhTSH stimulation was performed an average of 6 years after first follow-up testing.
Results
131I diagnostic scanning after rhTSH was negative in all 75 group A patients. Only one group A patient had detectable Tg after rhTSH injection (1.5 ng/ml), but Tg had also been detected at baseline in this patient (1.45 ng/ml). Given the absence of a response to stimulation, suggesting an interference, Tg was reassessed with a different technique and proved to be undetectable (<0.1 ng/ml). Stimulation with rhTSH in group B showed residual Tg in seven patients and residual 131I uptake in the thyroid bed in two patients, but none of these patients had signs of disease progression. Five group C patients (14%) had a positive rhTSH test result, and this was suggestive of disease progression in at least two cases.
Conclusion
The first follow-up testing is essential for prognostic classification after 131I ablation of thyroid cancer. In stage I patients, undetectable Tg and negative 131I scan 1 year after ablation define a large population of subjects who have a very low risk of recurrence and who do not require further stimulation tests. In contrast, periodic rhTSH stimulation tests appear useful in higher-risk patients.
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Acknowledgments
The authors are grateful to professor Philippe Bouchard, Head of the Endocrinology Department and President of the SFE “Société Française d’Endocrinologie”, and to R. Lawrence Sullivan, Jr., MD, at O’Connor Hospital, San Jose, California.
They would also like to thank Nicole Allegrini and all the laboratory staff and technicians of the Nuclear Medicine Department.
The study did not receive any financial support.
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Zanotti-Fregonara, P., Khoury, A., Duron, F. et al. Which thyroid cancer patients need periodic stimulation tests?. Eur J Nucl Med Mol Imaging 34, 541–546 (2007). https://doi.org/10.1007/s00259-006-0279-z
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DOI: https://doi.org/10.1007/s00259-006-0279-z