In addition, the effective half-life in tumor lesions was longer for [161Tb]Tb-PSMA-617 (mean half-life 46.1 ± 19.2 h) than for [177Lu]Lu-PSMA-617 (mean half-life 35.3 ± 6.3 h, p = 0.006). Here, FOLH1 is linked to neoplasm.