In the same year, Li et al. [79] evaluated [89Zr]Df-KN035, the first 79.6 kDa size anti-PD-L1 domain antibody (KN035), to monitor PD-L1 levels in nude mice bearing LN229 xenografts (brain cancer) with a positive expression for PD-L1. This evidence concerns the gene CD274 and brain cancer.