GRPR and cancer: This radionuclide has been used extensively in nuclear medicine for the development of target-specific molecular imaging of alpha(v)beta(3) integrins, somatostatin receptors, gastrin releasing peptide receptors (GRPr), for sentinel node detection and a myriad of receptor positive tumors [15,16,17,18,19,20], as well as in imaging of cancers that overexpress Scavenger Receptor type B1 [21].