The tumor-to-muscle ratio of 64Cu-DOTHA2-PSMA was lower than for 64Cu-CC34 and 64Cu-CB-TE2A-PSMA from 1 h to 24 h p.i. (studied in the transfected tumor overexpressing PSMA [30]) [9,15,16,17,18]. The gene discussed is FOLH1; the disease is neoplasm.