Risk factors for intravesical recurrence after nephroureterectomy in patients with upper urinary tract urothelial carcinoma.

Abstract

To determine major risk factors for bladder cancer (BC) recurrence after nephroureterectomy (Nux) by focusing on the pathologic appearances of tumors in upper urinary tract urothelial carcinomas (UUTUCs). We performed 147 Nux procedures between November 2002 and September 2015. Forty-eight patients were excluded because of a history of BC (28 patients), previous or concurrent radical cystectomy (9 patients), neoadjuvant chemotherapy (5 patients), and other reasons (6 patients). We classified UUTUCs into three types: renal pelvic, short-length ureteral, and long-length ureteral cancer; the cutoff for categorizing short- versus long-length ureteral cancer was the median tumor length. Univariate and multivariate analyses with Cox regression methods were performed to calculate hazard ratios (HRs) for BC recurrence using nine clinical covariates, including our new pathologic classification. The median follow-up period for the survivors was 60months (range 1-157months). Of 99 patients, 36 (36%) had BC recurrence; of these 36 patients, 30 (85%) experienced recurrence within 2years and 17 (47%) had invasive BC (≥pT1). Statistical analyses demonstrated that pathologic tumor type was the major significant risk factor for BC recurrence. Long-length (>5cm) ureteral cancer had the highest risk of BC recurrence compared to other tumor types (multivariate HR 2.1; 95% confidence interval 1.03-4.2). Our simple classification system based on the tumor's pathologic appearance is useful for predicting BC recurrence. Patients with long-length ureteral cancer have a high risk of BC recurrence.