Sachpekidis et al. (17) have found that the PSA level in prostate cancer patients showed significant correlation with the mean standard uptake value (SUVmean) and SUVmax of 68Ga-PSMA uptake in tumor tissues (r=0.6, r=0.57, respectively), and the Gleason score remained weak but showed marked correlation with SUVmean (r=0.33) and SUVmax (0.28). This evidence concerns the gene KLK3 and neoplasm.