SLC15A2 encodes peptide transporter 2 (PEPT2) [71] that was over-expressed in prostate cancer cell lines [72], however, expression of SLC15A2 at the mRNA level was found to be lower in prostate cancer tissue than benign prostatic hyperplasia (BPH) tissue [73]. This evidence concerns the gene SLC15A2 and Familial prostate cancer.