FOLH1 and neoplasm: However, the presence of the PSMA-targeting moiety led to an improved tumor-to-lung ratio compared to the free paclitaxel, as determined by the high uptake in this organ (uptake of PTX: 2.81 ± 0.62 μg/g tissue in tumor; 6.35 ± 0.46 μg/g tissue in lung; uptake of PTX-SS-DUPA: 0.65 ± 0.13 μg/g tissue in tumor; 0.28 ± 0.14 μg/g tissue in lung).