CD274 and neoplasm: Figure 5A illustrates the biodistribution results of various 89Zr-DFO-anti-PD-L1-mAb tracers in PD-L1-expressing CT26 tumor-bearing mice at 168 h p.i. The tumor uptake values of tracer_3X, tracer_10X, and tracer_20X were 2.2 ± 0.7, 2.2 ± 1.4, and 5.5 ± 2.7%ID/g at 168 h p.i., respectively (Table S1).