FOLH1 and neoplasm: The diagnostic potential was evaluated by SPECT in mice bearing PSMA-positive 22Rv1 or PSMA-negative PC-3 xenografts, showing a tumor to muscle ratio of 2.47, 3.42 and 4.63 and 1.31, 1.39 and 1.32, respectively after 0.5, 1 and 2 h.