FOLH1 and prostate cancer: For example, it is reported that the expression level of prostate-specific membrane antigen (PSMA, also known as glutamate carboxypeptidase 2) in prostatic cancer cells is 100-fold to 1000-fold to normal prostate epithelial cells (Troyer et al., 1995; Silver et al., 1997; Bostwick et al., 1998; Mannweiler et al., 2009; Maurer et al., 2015).