IL2 and neoplasm: In the 24‐h PET images shown in Figure 5A, 64Cu‐DOTA‐IL‐2‐Fc shows immune organ uptake in lymph nodes (12.1 percent injected dose per gram (%ID/g)) and spleen (21.1 %ID/g), tumor uptake (9.3 %ID/g), and liver clearance (9.7 %ID/g).