Christ and Wild and co-workers [21] reported that GLP-1 receptor imaging with [Lys40(Ahx-DTPA-111In)NH2]-exendin4 detected correctly the insulinoma in 19 out of 20 patients, what results in 95% sensitivity (95% CI 75–100) and 25% specificity (95% CI 3–71). The gene discussed is GLP1R; the disease is pancreatic insulinoma.