Degree of hydronephrosis predicts adverse pathological features and worse oncologic outcomes in patients with high-grade urothelial carcinoma of the upper urinary tract

ObjectiveTo evaluate degree of hydronephrosis (HN) as a surrogate for adverse pathological features and oncologic outcomes in patients with high-grade (HG) and low-grade (LG) upper tract urothelial carcinomas (UTUCs).MethodsWe retrospectively reviewed 141 patients with localized UTUCs that underwent extirpative surgery at a tertiary referral center. Preoperative imaging was used to evaluate presence and degree of ipsilateral HN. We evaluated degree of HN (none/mild vs. moderate/severe), pathological findings, and oncologic outcomes.ResultsHG UTUC was present in 113 (80%) patients, muscle-invasive disease (≥pT2) in 49 (35%), and non–organ-confined disease (≥pT3) in 41 (29%). At a median follow-up of 34 months, 49 (35%) patients experienced intravesical recurrence, 28 (20%) developed local/systemic recurrence, and 24 (17%) died of UTUC. HN was graded as none/mild in 77 (55%) patients and moderate/severe in 64 (45%). In patients with HG UTUC, but not LG, degree of HN was associated with advanced pathological stage (P<0.001), positive lymph nodes (P = 0.01), local/systemic recurrence-free survival (hazard ratio HR] = 5.5, P = 0.02), and cancer-specific survival (HR = 5.2, P = 0.02). On multivariable analysis of preoperative factors, degree of HN in patients with HG UTUC was associated with muscle invasion (HR = 9.3; 95% CI: 3.08–28.32; P<0.001), non–organ-confined disease (HR = 4.5; 95% CI: 1.66–12.06; P = 0.003), local/systemic recurrence-free survival (HR = 2.5; 95% CI: 1.07–5.64; P = 0.04), and cancer-specific survival (HR = 2.6; 95% CI: 1.05–6.22; P = 0.04).ConclusionsDegree of HN can serve as a surrogate for advanced disease and predict worse oncologic outcomes in HG UTUC. Degree of HN was not predictive of intravesical or local/systemic recurrence in LG UTUC.