GRPR and neoplasm: Although the GRPR binding affinity of Ga-LW02075 was significantly better than that of Ga-LW02050 (Ki = 1.39 ± 0.54 vs. 8.53 ± 1.52 nM, p = 0.0016), [68Ga]Ga-LW02075 showed a lower tumor uptake (3.97 ± 1.71 vs. 5.38 ± 1.00 %ID/g).