Additional markers for primary prostatic cancers have been investigated, including prostate-specific membrane antigen (PSMA), prostate-specific acid phosphatase (PSAP), prostein (also known as p501s or SLC45A3), ETS-related gene (ERG), androgen receptor (AR) [98,99,100,101,102,103,104]. The gene discussed is AR; the disease is prostate carcinoma.