In contrast, while increased tumor uptake of 68Ga-grazytracer was observed from days 0 to 6 following anti–PD-1 plus anti–CTLA-4 treatment, no significant differences were observed following treatment with anti–PD-1 plus anti–CTLA-4 and FTY720 (Figure 5, E and F). Here, CTLA4 is linked to neoplasm.