GLP1R and pancreatic insulinoma: In insulinomas, for example, the density of the glucagon-like peptide 1 receptor (GLP-1R) is considerably higher than in normal pancreas (mean density of 8,302 ± 1,073 dpm/mg in benign human insulinomas vs. 1,563 ± 104 dpm/mg in normal endocrine pancreas) [10, 11].