DPP4 and neoplasm: The intensities of DPP4 staining in tumor-matched controls, Gleason 3, Gleason 4 and Gleason 5 tumors were 2.51 ± 0.75, 2.69 ± 0.57, 1.96 ± 0.92 and 1.47 ± 0.92, respectively.