Conversely, in the MDA-MB-435 (GRPR-) cell line, the tumor uptake at 1 h for 64Cu-NOTA-RGD-BBN and 68Ga-NOTA-RGD-BBN was 1.84 ± 0.44%ID/g and 2.24 ± 0.73%ID/g, respectively. Here, GRPR is linked to neoplasm.