FOLH1 and neoplasm: The tumour to blood ratios were 6.8 ± 0.6 and 0.4 ± 0.2 (t test, P < 0.0004), while the tumour to muscle ratios were 13.5 ± 3.1 and 2.5 ± 0.5 (P < 0.004), for DU145-PSMA and DU145 tumours, respectively.