FOLH1 and prostate carcinoma: At the mRNA level PSMA-coding gene FOLH1 (folate hydrolase 1) expression is to a certain extent detectable almost in all tumor types, however, there are several spikes on this pan-tumor landscape where the potential diagnostic and therapeutic applications of PSMA seems to be more promising, even if the expression in comparison to prostate cancer is relatively low (Figure 1).