Another study used 64Cu chelated to the “cage” of sarcophagine, i.e. 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane-1,8-diamine, conjugated via linkers to two NGR peptides, for imaging CD13+ HT-1080 cells in comparison to CD13-MCF-7 breast adenocarcinoma cells. This evidence concerns the gene ANPEP and breast adenocarcinoma.