ASTN1 and neoplasm: To evaluate the pharmacokinetics of the radiolabeled αSTn-IgG4 TM for in vivo imaging of STn-overexpressing tumor sites, the αSTn-IgG4 TM was conjugated with the chelator NODAGA and further labeled with the PET isotope copper resulting in [64Cu]Cu-NODAGA-αSTn-IgG4 TM.