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Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging 7/2011

01.07.2011 | Original Article

68Ga-DOTATOC PET/CT and somatostatin receptor (sst1–sst5) expression in normal human tissue: correlation of sst2 mRNA and SUVmax

verfasst von: Christian Boy, Till A. Heusner, Thorsten D. Poeppel, Anja Redmann-Bischofs, Nicole Unger, Walter Jentzen, Wolfgang Brandau, Klaus Mann, Gerald Antoch, Andreas Bockisch, Stephan Petersenn

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 7/2011

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Abstract

Purpose

By targeting somatostatin receptors (sst) radiopeptides have been established for both diagnosis and therapy. For physiologically normal human tissues the study provides a normative database of maximum standardized uptake value (SUVmax) and sst mRNA.

Methods

A total of 120 patients were subjected to diagnostic 68Ga-DOTATOC positron emission tomography (PET)/CT (age range 19–83 years). SUVmax values were measured in physiologically normal tissues defined by normal morphology, absence of surgical intervention and absence of metastatic spread during clinical follow-up. Expression of sst subtypes (sst1–sst5) was measured independently in pooled adult normal human tissue by real-time reverse transcriptase polymerase chain reaction (RT-PCR).

Results

SUVmax revealed a region-specific pattern (e.g., mean ± SD, spleen 31.1 ± 10.9, kidney 16.9 ± 5.3, liver 12.8 ± 3.6, stomach 7.0 ± 3.1, head of pancreas 6.2 ± 2.3, small bowel 4.8 ± 1.8, thyroid 4.7 ± 2.2, bone 3.9 ± 1.3, large bowel 2.9 ± 0.8, muscle 2.1 ± 0.5, parotid gland 1.9 ± 0.6, axillary lymph node 0.8 ± 0.3 and lung 0.7 ± 0.3). SUVmax was age independent. Gender differences were evident within the thyroid (female/male: 3.7 ± 1.6/5.5 ± 2.4, p < 0.001; Mann-Whitney U test) and the pancreatic head (5.5 ± 1.9/6.9 ± 2.2, p < 0.001). The sst mRNA was widely expressed and heterogeneous, showing sst1 to be most abundant. SUVmax values exclusively correlated with sst2 expression (r = 0.846, p < 0.001; Spearman rank correlation analysis), whereas there was no correlation of SUVmax with the expression of the other four subtypes.

Conclusion

In normal human tissues 68Ga-DOTATOC imaging has been related to the expression of sst2 at the level of mRNA. The novel normative database may improve diagnostics, monitoring and therapy of sst-expressing tumours or inflammation on a molecular basis.
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Metadaten
Titel
68Ga-DOTATOC PET/CT and somatostatin receptor (sst1–sst5) expression in normal human tissue: correlation of sst2 mRNA and SUVmax
verfasst von
Christian Boy
Till A. Heusner
Thorsten D. Poeppel
Anja Redmann-Bischofs
Nicole Unger
Walter Jentzen
Wolfgang Brandau
Klaus Mann
Gerald Antoch
Andreas Bockisch
Stephan Petersenn
Publikationsdatum
01.07.2011
Verlag
Springer-Verlag
Erschienen in
European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 7/2011
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-011-1760-x

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