Cytoreductive nephrectomy in the modern era: Predictors of use, morbidity, and survival.

INTRODUCTION

To determine tumour, patient, and provider factors associated with cytoreductive nephrectomy (CN) use and to identify those factors that predicted short-term and long-term surgical outcomes.

METHODS

We performed a retrospective review (1998-2011) of the National Cancer Database, a U.S. population-based oncology outcomes database. The review included 36 549 patients with metastatic renal cell carcinoma (mRCC). We assessed predictors of CN use, length of stay (LOS), 30-day readmission, and 30-day mortality using multivariable logistic regression. The Cox proportional hazards model assessed predictors of overall survival (OS).

RESULTS

Overall, 10 809 (29.6%) patients received CN, increasing from 15.2% to 36.1% over time. Private insurance (odds ratio [OR] 1.26; 95% confidence interval [CI] 1.16-1.37) and academic facilities (OR 1.83; 95% CI 1.68-1.99) were associated with receiving CN (p<0.0001). Charlson score ≥2 and older age group were less likely to undergo surgery (p<0.0001). Median LOS was five days (inter-quartile range [IQR] 3-7), while 30-day readmission and 30-day mortality were 5.3% and 3.3%, respectively. Undergoing CN (hazard ratio [HR] 0.48; 95% CI 0.44-0.52; p<0.0001) and treatment at academic centres (HR 0.88; 95% CI 0.81-0.95; p=0.001) were independently associated with improved OS. Limitation includes retrospective design with possible selection bias.

CONCLUSIONS

Increased CN use continues in the modern era, with relatively low surgical morbidity. Further study is required to determine if the finding of lower all-cause mortality in patients treated at academic centres is due to improved care or unmeasured confounders.