DPP4 and neoplasm: Furthermore, we correlated the expression of the 11 genes with clinicopathological features, and the results indicated that UBE2J1, SRD5A2, OGN, MYBPC1, KIF13B, and DPP4 were negatively correlated with Gleason score, PSA level, and pathological tumor stage, while opposite results were obtained for the STMN1, NOX4, ITGA11, COL1A1, and CDKN3 genes (Fig. 1e).