CD274 and neoplasm: The radiotracer uptake in the tumor was comparable to previously described site-specifically labeled VHHs: 4.17 ± 1.31%ID/g vs. 1.86 ± 0.67%ID/g for the 68Ga-labeled targeting hPD-L1 80 min p.i., and 4.43 ± 1.50%ID/g for 111In-labeled targeting hHER2 90 min p.i. (Chigoho et al. 2021; Massa et al. 2014).