FOLH1 and prostate carcinoma: PSMA (also known as folate hydrolase 1, glutamate carboxypeptidase II, and N-acetyl-L-aspartyl-L-glutamate peptidase I) is a 100-kDa type II transmembrane glycoprotein receptor heterogeneously expressed at low levels in the normal prostate secretory epithelium but is expressed homogenously at considerably higher levels in prostate carcinoma (8, 9) and in the endothelium of most solid tumor neovasculature (8–11).