LAG3 and neoplasm: The quantification analysis revealed that LAG‐3+ A549 tumors possessed an apparently higher tumor signal than LAG‐3− A549 or H1975 tumors at 24 h post‐injection, e.g., 5.7 ± 0.9 vs 3.1 ± 1.0 %ID/cc (ROI; p < 0.05) and 6.5 ± 0.3 vs 3.0 ± 1.7 (T/M ratio; p < 0.05) (Figure 5e,f).