Moreover, 6 h after injection, Tf@IR820–DHA exhibited a greater concentration of tumor sites than free IR820 and IR820–DHA NPs, with even higher fluorescence levels in tumor tissues compared to other major organs (Figure 12C) and ≈15 and 3 times higher, respectively, than tumors treated with IR820 and IR820–DHA NPs (Figure 12D). Here, TF is linked to neoplasm.