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The Quarterly Journal of Nuclear Medicine and Molecular Imaging 2022 June;66(2):156-61

DOI: 10.23736/S1824-4785.19.03178-9


language: English

Uptake pattern of [68Ga]Ga-DOTA-NOC in tissues: implications for inflammatory diseases

Luz K. ANZOLA 1, 2, 3 , Chiara LAURI 2, Carlos E. GRANADOS 4, Bruno LAGANÀ 5, Alberto SIGNORE 2, 3

1 Unit of Nuclear Medicine, Clinica Colsanitas, Bogotà, Colombia; 2 Unit of Nuclear Medicine, Department of Medical-Surgical Sciences and of Translational Medicine, Sapienza University, Rome, Italy; 3 Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands; 4 Medicina Nuclear, Hospital San Ignacio, Bogotá, Colombia; 5 Unit of Rheumatology, Department of Clinical and Molecular Medicine, Sapienza University, Rome, Italy

BACKGROUND: [68Ga]Ga-DOTA-NOC binds to somatostatin receptor (SSTR) subtypes 2 and 5, also expressed on lymphocytes and macrophages, but no information is available about uptake in tissues that might be affected by a chronic inflammatory process. Our aim was to obtain normal reference values for: [68Ga]Ga-DOTA-NOC uptake in tissues prone to chronic inflammation.
METHODS: Retrospective study in 81 patients who performed the scan for a suspicion of neuroendocrine tumor (NET). We analyzed major joints, salivary glands, thyroid, aortic wall from images acquired after injection of 173.9±1 Mbq of: [68Ga]Ga-DOTA-NOC. We calculated the SUVmax and SUVtarget/SUVgluteus ratio or SUVtarget/SUVaorta ratio. Data are reported as mean±2 or ±3 standard deviations (SD).
RESULTS: SUVmax values appeared more reliable than other ratios. In thyroid we found a mean SUVmax of 1.36±0.45, with no values >3SD; in parotid glands 0.98±0.40, with 2 values >3SD; in submandibular glands 0.99±0.37, with 2 values >3SD; in aortic arch 1.71±0.50, with 1 value >3SD; in thoracic aorta 2.03±0.52, with 1 value >3SD; in abdominal aorta 2.19±0.49, with no value >3SD; in shoulders 0.92±0.31 and in hips 0.87±0.34, with 2 and 4 values >3SD, respectively. These 12 values with SUVmax >3SD, belong to 5 patients, 3 of which had signs of xerostomia and/or arthritis. A statistically significant correlation was observed between SUVmax and age in all examined tissues but in the aorta.
CONCLUSIONS: Tissues in which lymphocytic infiltration may occur show that SUVmax is tissue-dependent. Within tissue variability, an SUVmax greater than the mean +3SD is rarely found amongst patients without a symptomatic chronic inflammatory process but, when found, may highlight a chronic inflammatory condition.

KEY WORDS: Receptors, somatostatin; 68Ga-DOTANOC; Inflammation; Autoimmune diseases

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