Upon the assessment of the in vivo static PET scans, enhanced tumour accumulation and retention were observed for the dimeric NGR at all time points, with respective uptake values of 6.53 ± 0.20%, 6.09 ± 0.18%, 5.22 ± 0.17%, and 3.60 ± 0.23% ID/g at 1-, 2-, 4-, and 24-h post-injection compared to the [64Cu]Cu-NGR monomer (3.33 ± 0.10%, 3.09 ± 0.20%, 2.32 ± 0.17%, and 1.79 ± 0.27% ID/g at 1-, 2-, 4-, and 24-h after the injection; respectively) [55]. The gene discussed is RTN4R; the disease is neoplasm.