Vol 57, No 4 (2006)
Original paper
Published online: 2006-07-07

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The role of scintigraphy with the use of 99mTc-HYNIC-TOC in the diagnosis of medullary thyroid carcinoma

Rafał Czepczyński, Jerzy Kosowicz, Katarzyna Ziemnicka, Renata Mikołajczak, Maria Gryczyńska, Jerzy Sowiński
Endokrynol Pol 2006;57(4):431-437.


Introduction: Recently a new somatostatin analogue labelled with 99mTc (99mTc-HYNIC-TOC) has been synthetized. Aim of this study was to evaluate the utility of 99mTc-HYNIC-TOC in the radionuclide imaging in patients with medullary thyroid carcinoma (MTC).
Material and methods: 30 patients with MTC aged 22-83 years in different stages of the disease were investigated. In 6 patients (group 1) scintigraphy was performed before surgery directly after diagnosis of MTC. Four patients (group 2) were qualified to the study in the phase of remission after surgical treatment that had been confirmed by low concentrations of calcitonin. Twenty patients (group 3) were investigated due to stagnation or recurrence confirmed by persistent hypercalcitoninemia. The scintigraphy using 99mTc-HYNIC-TOC (Tektrotyd, POLATOM) was performed 2 and 4 hours post injection of 20 mCi (740 MBq) of the tracer. Other imaging techniques were also employed and analysed in individual cases (US, CT, 99mTc(V)-DMSA, 131I-MIBG, 99mTc-MDP, 111In-octreotide and FDG-PET).
Results: Images obtained 2 and 4 hours p.i. were similar. In group 1, uptake of the tracer was found in the primary tumour of MTC in all patients. In group 2, a false positive result was found in 1 of 6 patients. In the remaining 5 of 6 cases no pathological foci were visualised. In group 3, uptake in the thyroid bed was found in 3 of 20 cases and in the lymph nodes in 14 of 20 patients. In 3 of 20 cases uptake in the bone metastases was found. Globally, sensitivity of the scintigraphy using 99mTc-HYNIC-TOC was 86.4%, specificity - 75.0%, and accuracy - 84.6%.
Conclusion: The scintigraphy using 99mTc-HYNIC-TOC showed high utility in the diagnosis of MTC. Confirmation of the presence of somatostatin receptors with this method may be used for treatment planning: surgery or radionuclide therapy.

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