ALB and neoplasm: In PET and PET/CT images of 68Ga-NOTA-HSA-TIMP2 (Figure 4(B), left) and 68Ga-NOTA-RGD-HSA-TIMP2 (Figure 4(B), right) for 3 h after injection, the level of tumor uptake of 68Ga-NOTA-RGD-HSA-TIMP2 was slightly higher than that of 68Ga-NOTA-HSA-TIMP2, when no tumor uptake of 68Ga-NOTA-HSA-TIMP2 was observed (Figure 4).