DPP4 and renal pelvis/ureter urothelial carcinoma: Univariate analysis shows that high DPP4 expression is associated with dismal DSS (p < 0.0001) and MeFS (p < 0.0001) outcome in UTUC patients, along with multifocality, primary tumor (pT) stage, nodal metastasis, histological grade, vascular invasion, and perineural invasion (Figure 3, Table 2).