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Screening in asymptomatic SDHx mutation carriers: added value of 18F-FDG PET/CT at initial diagnosis and 1-year follow-up

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European Journal of Nuclear Medicine and Molecular Imaging Aims and scope Submit manuscript

Abstract

Purpose

Specific recommendations on screening modalities for paraganglioma (PGL) and phaeochromocytoma (PCC) in asymptomatic SDHx mutation carriers (relatives) are still lacking. We evaluated the added value of 18F-FDG PET/CT in comparison with morphological imaging at initial diagnosis and 1 year of follow-up in this population.

Methods

The study included 30 consecutive relatives with a proven SDHx mutation who were investigated by 18F-FDG PET/CT, gadolinium-enhanced magnetic resonance angiography of the head and neck, thoracic/abdominal/pelvic (TAP) contrast-enhanced CT and/or TAP MRI. 123I-MIBG scintigraphy was performed in 20 subjects and somatostatin receptor scintigraphy (SRS) in 20 subjects. The gold standard was based on pathology or a composite endpoint as defined by any other positive imaging method and persistent tumour on follow-up. Images were considered as false-positive when the lesions were not detected by another imaging method or not confirmed at 1 year.

Results

At initial work-up, an imaging abnormality was found in eight subjects (27 %). The final diagnosis was true-positive in five subjects (two with abdominal PGL, one with PCC and two with neck PGL) and false-positives in the other three subjects (detected with 18F-FDG PET/CT in two and TAP MRI in one). At 1 year, an imaging abnormality was found in three subjects of which one was an 8-mm carotid body PGL in a patient with SDHD mutaion and two were considered false-positive. The tumour detection rate was 100 % for 18F-FDG PET/CT and conventional imaging, 80 % for SRS and 60 % for 123I-MIBG scintigraphy. Overall, disease was detected in 4 % of the subjects at the 1-year follow-up.

Conclusion

18F-FDG PET/CT demonstrated excellent sensitivity but intermediate specificity justifying combined modality imaging in these patients. Given the slow progression of the disease, if 18F-FDG PET/CT and MRI are normal at baseline, the second imaging work-up should be delayed and an examination that does not expose the patient to radiation should be used.

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Acknowledgments

Seventeen patients were previously enrolled in the PGL.EVA study supported by Program Hospitalier National de Recherche Clinique 2004 (PCR05007).

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Research Involving Human Participants

For this type of retrospective study formal consent is not required.

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Correspondence to C. Lepoutre-Lussey.

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Lepoutre-Lussey, C., Caramella, C., Bidault, F. et al. Screening in asymptomatic SDHx mutation carriers: added value of 18F-FDG PET/CT at initial diagnosis and 1-year follow-up. Eur J Nucl Med Mol Imaging 42, 868–876 (2015). https://doi.org/10.1007/s00259-015-3003-z

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  • DOI: https://doi.org/10.1007/s00259-015-3003-z

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