Subjects with various GLP1-R-related disease patients underwent 68Ga/18F-Exendin 4 PET/CT either for an initial assessment or for recurrence detection. Lesions uptake was quantified by the maximum standard uptake value (SUVmax). The sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and accuracy of 68Ga/18F-Exendin 4 PET/CT were calculated.