The ability of 18F-AlF-NOTA-ZPD-L1 and 68Ga-NOTA-ZPD-L1 to visualise PD-L1+ cells in the brain was evaluated using intracranial U87-MGvIII and GCGR-E55 tumour models, respectively (Figure 4A and Figure 5C). This evidence concerns the gene CD274 and neoplasm.