Glucagon-like Peptide-1 Receptor PET/CT in GLP-1R Related Disease

This study uses a special type of imaging scan (PET/CT with an Exendin-4 tracer) that targets GLP-1 receptors — the same receptors that diabetes drugs like semaglutide target — to better detect and locate tumors that have these receptors. **You may be eligible if...** - Age 18 or older - Have a suspected, newly diagnosed, or previously treated cancer - Have been scheduled for an Exendin-4 PET/CT scan as part of your clinical care - Able to provide informed consent **You may NOT be eligible if...** - Are pregnant or breastfeeding - Have a known allergy to Exendin-4 or related compounds - Have serious kidney problems that prevent the scan - Are unable to complete the scan procedure Talk to your doctor to see if this trial is right for you.