FOLH1 and neoplasm: Instead, the PSMA uptake in bone marrow, parotid gland and kidney was considerably higher than in the tumor, resulting in very low tumor-to-kidney, tumor-to-bone marrow and tumor-to-parotid gland ratios (TKRmean 1.5 × 10-2 ± 0.5 × 10-2, TBmRmean 0.4 ± 0.1 and TPRmean 0.1 ± 0.1; see Supplementary Material).