01.04.2012 | Original Article
Comparison of 18F-DOPA, 18F-FDG and 68Ga-somatostatin analogue PET/CT in patients with recurrent medullary thyroid carcinoma
Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 4/2012
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Purpose
To retrospectively evaluate and compare 18F-FDG, 18F-DOPA and 68Ga-somatostatin analogues for PET/CT in patients with residual/recurrent medullary thyroid carcinoma (MTC) suspected on the basis of elevated serum calcitonin levels.
Methods
Included in the study were 18 patients with recurrent MTC in whom functional imaging with the three tracers was performed. The PET/CT results were compared on a per-patient basis and on a per-lesion-basis.
Results
At least one focus of abnormal uptake was observed on PET/CT in 13 patients with 18F-DOPA (72.2% sensitivity), in 6 patients with 68Ga-somatostatin analogues (33.3%) and in 3 patients with 18F-FDG (16.7%) (p < 0.01). There was a statistically significant difference in sensitivity between 18F-DOPA and 18F-FDG PET/CT (p < 0.01) and between 18F-DOPA and 68Ga-somatostatin analogue PET/CT (p = 0.04). Overall, 72 lesions were identified on PET/CT with the three tracers. 18F-DOPA PET/CT detected 85% of lesions (61 of 72), 68Ga-somatostatin analogue PET/CT 20% (14 of 72) and 18F-FDG PET/CT 28% (20 of 72). There was a statistically significant difference in the number of lymph node, liver and bone lesions detected with the three tracers (p < 0.01). In particular, post-hoc tests showed a significant difference in the number of lymph node, liver and bone lesions detected by 18F-DOPA PET/CT and 18F-FDG PET/CT (p < 0.01 for all the analyses) and by 18F-DOPA PET/CT and 68Ga-somatostatin analogue PET/CT (p < 0.01 for all the analyses). The PET/CT results led to a change in management of eight patients (44%).
Conclusion
18F-DOPA PET/CT seems to be the most useful imaging method for detecting recurrent MTC lesions in patients with elevated serum calcitonin levels, performing better than 18F-FDG and 68Ga-somatostatin analogue PET/CT. 18F-FDG may complement 18F-DOPA in patients with an aggressive tumour.
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