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18F-FDOPA PET/CT Uptake Parameters Correlate with Catecholamine Secretion in Human Pheochromocytomas
Sophie Moog1,2, Sébastien Houy2, Elodie Chevalier3
1Department of Endocrinology, University Hospital of Nancy, Nancy, France.
Neuroendocrinology
|June 28, 2018
Summary
18F-FDOPA PET/CT metabolic burden in pheochromocytomas (PHEO) correlates with catecholamine secretion. Higher uptake may indicate increased catecholamine release, offering new insights into PHEO diagnosis and management.
Area of Science:
- Endocrinology
- Nuclear Medicine
- Oncology
Background:
- 18F-FDOPA positron emission tomography/computed tomography (PET/CT) is a key diagnostic tool for pheochromocytomas (PHEO).
- The relationship between 18F-FDOPA uptake and catecholamine secretion in PHEO is not well understood.
Purpose of the Study:
- To investigate the correlation between 18F-FDOPA PET/CT parameters and catecholamine secretion in PHEO.
- To explore the potential of 18F-FDOPA uptake as a predictor of PHEO secretory activity.
Main Methods:
- Retrospective analysis of 39 patients with histologically confirmed PHEO who underwent 18F-FDOPA PET/CT.
- Evaluation of standardized uptake values (SUVmax, SUVmean) and metabolic burden (MB = SUVmean × tumor volume).
- Measurement of plasma/urinary metanephrine (MN), normetanephrine (NM), and chromogranin A; genetic screening; and ex vivo catecholamine release measurements.
Main Results:
- Metabolic burden (MB) positively correlated with urinary NM, MN, and combined MN/NM excretion, and plasma free NM.
- In patients with genetic mutations, MB also correlated with urinary combined MN and NM.
- A positive correlation was found between the PHEO-to-liver SUVmax ratio and catecholamine exocytosis events.
Conclusions:
- 18F-FDOPA PET/CT metabolic burden in PHEO is strongly associated with catecholamine secretion markers.
- 18F-FDOPA uptake may be influenced by catecholamine exocytosis, suggesting a link between imaging findings and tumor secretory activity.
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