ALB and neoplasm: Pre-injection of mice with folic acid resulted in an almost entire blockade of the tumor and kidney accumulation of all three radioconjugates up to 4 h p.i. In order to block the uptake efficiently also at 24 h p.i., pre-injection of excess albumin-binding folate (cm13) was, however, necessary in particular in the case of [177Lu]Lu-6S-RedFol-1 (Supplementary Material, Figs. S6–S8).