The first tracer for PET imaging of the androgen receptors was 20‐[18F]fluoromibolerone ([18F]Fmib), which was tested in both rats and baboons with promising results.65, 66 More tracers have been synthesised and tested as markers of prostate cancer,67 of which 16ß‐[18F]fluorodihydrotestosterone ([18F]FDHT) is the most promising so far. This evidence concerns the gene AR and Familial prostate cancer.