Prevalence and factors associated with baseline chronic kidney disease in China: A 10-year study of 785 upper urinary tract urothelial carcinoma patients

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There is relatively little literature on prevalence of chronic kidney disease (CKD) prior to surgery in patients with upper urinary tract urothelial carcinoma (UTUC). We evaluated the prevalence and clinical associated factors of baseline CKD in patients with UTUC. There were 785 patients with a pathologic diagnosis of UTUC from January 2002 to December 2011 who were analyzed in this study. Estimated glomerular filtration rate (eGFR) was calculated by re-expressed Modification of Diet in Renal Disease (MDRD) formulas for the Chinese population. A multivariate logistic regression was performed to evaluate the odds ratios (ORs) for CKD stage 3 or higher in UTUCs after data differences were tested. The prevalence of CKD in UTUCs presenting at our hospital was 58.6% and 70.8% in the group age 70 years and older. Older age [per year increased; OR=1.050; 95% confidence interval (CI): 1.034-1.067], lower tumor stage (T stage; per stage increased; OR=0.666; 95% CI: 0.544-0.816), higher tumor grade (per grade increased; OR=1.392; 95% CI: 1.004-1.930) and themain tumor locating in the pelvis (ureter as reference; OR=0.648; 95% CI: 0.475-0.885) were independently associated with decreased kidney function in the multivariate logistic regression. The use of serum creatinine (Scr) only to evaluate the renal function would ignore a large proportion of patients suffering from CKD stage 3 in UTUCs, especially in those older than 70 years (39.3% vs. 54.1%, p=0.022). We demonstrated a high prevalence (58.6%) of CKD in patients with UTUC, particularly in the group older than 70 years (70.8%). Older age, lower T stage, higher tumor grade, and the main tumor locating in pelvis (ureter as reference) were independently associated with CKD in UTUCs.