FOLH1 and neoplasm: However, at longer time point, at two-hours p.i., [68Ga]Ga-PSMA-617 had better both tumour-to-background ratios when compared with inhibitor P19; 13.6 ± 7.0 vs. 9.1 ± 1.7 (tumour-to-blood) and 68.4 ± 66.1 vs. 47.8 ± 12.4 (tumour-to-muscle), but the difference is not statistically significant.