We measured the distribution of 64Cu-labeled SARTATE in a metastatic model of NB, demonstrated its localization in liver metastases using PET (64Cu) and SPECT (67Cu), and confirmed the uptake of [64Cu]Cu-SARTATE in viable, SSTR2-expressing regions of the liver metastases. The gene discussed is SSTR2; the disease is digestive system neoplasm.