FOLH1 and neoplasm: Average tumor volumes at injection were 108 ± 55 mm3, 93.3 ± 56.1 mm3, and 107 ± 35 mm3 for 64Cu-DOTHA2-PSMA, natCu-DOTHA2-PSMA and 177Lu-PSMA-617 groups, respectively (no significant difference between groups (p > 0.91)).