Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• European journal of nuclear medicine and molecular imaging, 2011-07, Vol.38 (7), p.1224-1236

Ort / Verlag

Berlin/Heidelberg: Springer-Verlag

Erscheinungsjahr

2011

Link zum Volltext

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• 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 (SUV max ) and sst mRNA. Methods A total of 120 patients were subjected to diagnostic 68 Ga-DOTATOC positron emission tomography (PET)/CT (age range 19–83 years). SUV max 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 SUV max 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). SUV max 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. SUV max values exclusively correlated with sst2 expression ( r  = 0.846, p  < 0.001; Spearman rank correlation analysis), whereas there was no correlation of SUV max with the expression of the other four subtypes. Conclusion In normal human tissues 68 Ga-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.