Theranostic PET for Target Validation and Tumor Detection

Patients are referred for theranostic PET using different tracers as part of clinical routine for tumor staging, re-staging, and therapy planning to our department. The aim of this study is to collect data on the expression of target molecules/receptors, proportion of PET positive tumor regions, positive predictive value, detection rate, reproducibility, and impact on clinical management of theranostic PET/CT or PET/MRI using novel theranostic PET tracers or other established PET tracers that are performed in theranostic concepts on patients receiving this imaging modality as part of clinical standard both at initial diagnosis and restaging before treatment decisions. Primary Endpoint: Association between PET uptake intensity in theranostic PET and histopathologic expression of the respective molecular target.