FAP and cancer: Recent studies with quinolone-based positron-emission tomography (PET) tracers, acting as FAP inhibitors (FAPI), showed promising results with [68Ga]Ga-FAPI-PET for diagnosis and staging of various cancers [3, 7], with comparable or even better results in primary tumor detection than [18F]fluorodeoxyglucose(FDG)-PET/computed tomography (CT) [8].