PDCD1 and neoplasm: The SPECT imaging demonstrated that the uptake of [111In]In-DTPA-anti–PD-L1 antibodies in tumour increased to 29.5 ± 7.4%ID/g at 24 h, reached the pick value of 56.5 ± 16.7%ID/g at 72 h post-injection.319 Maute et al. developed an engineered nanobody (HAC–PD-1) for PET imaging.