Nilsson et al. showed the presence of mRNAs; prostate cancer antigen 3 (PCA3) and transmembrane protease serine 2:v-ets erythroblastosis virus E26 oncogene homolog (TMPRSS2:ERG) in tumor exosomes from the urine of PCa patients [59]. The gene discussed is ERG; the disease is posterior cortical atrophy.