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Preoperative chronic kidney disease is predictive of oncological outcome of radical cystectomy for bladder cancer.

PURPOSE: To evaluate the impact of preoperative chronic kidney disease (CKD) on oncological outcomes after radical cystectomy (RC) for bladder cancer.

METHODS: We reviewed the medical records of patients with urothelial bladder carcinoma who underwent RC with curative intent at seven hospitals between 1990 and 2013. After excluding patients with a history of upper urinary tract urothelial cancer or neoadjuvant chemotherapy, we analyzed 594 cases for the study. Preoperative estimated glomerular filtration rate (eGFR) was calculated using the three-variable Japanese equation for GFR estimation from serum creatinine level and age. Patients were divided into four groups of different CKD stages based on eGFR values (mL/min/1.73 m2 ), i.e., ≥ 60 (CKD stages G1-2), 45-60 (G3a), 30-45 (G3b), and < 30 (G4-5). Survival was estimated using the Kaplan-Meier method. Univariate and multivariate Cox proportional hazards regression analyses addressed survivals after RC.

RESULTS: Median age of patients was 67 years. Patients were classified into CKD stages: G1-2 (n = 388; 65.3%), G3a (n = 122; 20.5%), G3b (n = 51; 8.6%), and G4-5 (n = 33; 5.6%). During a median follow-up of 4.0 years, 200 and 164 patients showed cancer progression and died of bladder cancer, with the 5-year progression-free survival (PFS) and cancer-specific survival (CSS) of 64.9 and 70.2%, respectively. On multivariate analyses, CKD stages of G3b or greater, advanced pT stage, lymph node metastasis, and positive lymphovascular invasion were independent poor prognostic factors for PFS and CSS.

CONCLUSIONS: We demonstrated that the advanced preoperative CKD stage was significantly associated with poor oncological outcomes of the bladder cancer after RC.

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