PDCD1 and neoplasm: The mice in the anti–PD-1–treated group were divided into 2 groups based on the tumor uptake values of 68Ga-grazytracer (cutoff of 1.45 percent injected dose per gram tissue [%ID/g] — the highest tumor uptake value of 68Ga-grazytracer in the control group): those with tumor uptake ≥1.45 %ID/g (high-uptake group; mean tumor uptake, 2.23 ± 0.33, range, 1.93–2.84); and those with tumor uptake <1.45 %ID/g (low-uptake group; mean tumor uptake, 1.18 ± 0.19, range, 0.93–1.44) (Figure 3B).