At 24 h p.i. [177Lu]Lu-eFAP-6 was almost completely washed out of the FAP-positive tumor, with only 0.5 ± 0.1% ID/g remaining, and while at 24 h p.i. the [177Lu]Lu-FAPI-46 uptake has also drastically decreased, it was significantly higher (1.9 ± 0.3% ID/g, p < 0.05) (Fig. 6C, Table S1). This evidence concerns the gene FAP and neoplasm.