GRPR and neoplasm: Additionally, 68Ga-, 111In-, and 18F-AlF-labeled NOTA-PEG2-RM26 (where RM26 = D-Phe-Gln-Trp-Ala-Val-Gly-His-Sta-Leu-NH2) conjugates demonstrated favorable properties for cell binding and internalization (IC50 = 1.24 ± 0.29 nM for 111In- and 0.91 ± 0.19 nM for 68Ga-labeled NOTA- PEG2-RM26), specific tumor uptake (8.1 ± 0.4%ID/g for 68Ga- and 5.7 ± 0.3%ID/g for 111In-labeled NOTA- PEG2-RM26), and imaging of GRPR-expression in PC-3 tumor-bearing mice [34,35].