Biodistribution studies in BxPC-3 tumor-bearing mice confirmed the prolonged half-life in blood as a result of low micromolar affinity to albumin, in which the blood uptake at 4 h was 1.23 ± 0.30% ID/g for [177Lu]Lu-EB-DOTA-(PEG28)2-A20FMDV2 and 1.06 ± 0.07% ID/g for [177Lu]Lu-IBA-DOTA-(PEG28)2-A20FMDV2. The gene discussed is ALB; the disease is neoplasm.