The glucagon-like peptide type 1 receptor (GLP-1R) is overexpressed in virtually all benign insulinoma with high incidence and density and is considered a valuable target for the efficient visualisation by radiotracers (Reubi and Waser 2003; Wild et al. 2011; Wild et al. 2008; Korner et al. 2012). The gene discussed is GLP1R; the disease is pancreatic insulinoma.