GRPR and neoplasm: There was also a tendency for a higher uptake in some tissues (e.g. pancreas, tumor) for the [188Re]Re-labeled analogs in comparison with the ones labelled with Tc-99 m, especially for GRPR-expressing tissues, a trend also shown for PSMA and somatostatin analogs (Guhlke et al. 1998; Pham et al. 2024).