CD274 and neoplasm: After conjugation with the chelator 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) and labeling with the radionuclide 68Ga, 68Ga-NOTA-Nb109 can bind with PD-L1 in vivo and accumulate specifically in locations with high PD-L1 expression, such as the A375-hPD-L1 tumor.