Although the accumulation of the tracer in both tumor and femur were similar (4.2 ± 0.7 and 3.4 ± 0.4%ID/g, respectively), the bone-uptake was, in contrast to tumor-uptake, not PSMA-specific since it could not be blocked by the PSMA inhibitor PMPA (2-(Phosphonomethyl)pentanedioic acid). This evidence concerns the gene FOLH1 and neoplasm.