National determinants of active surveillance among patients with clinical stage 1A kidney tumors.

694Background: Active surveillance (AS) has been increasingly recognized as a viable management strategy for patients with small renal masses (SRM). To better understand the contemporary management landscape of SRMs we examined practice patterns in a nationally representative cancer database. Methods: We identified patients with clinical T1a renal masses within the National Cancer Database (NCDB) between 2010 to 2014. Patients were classified according to initial management received including AS, surgery, ablation, or other treatment. We characterized time trends in the use of surveillance versus definitive therapy and examined clinical and socio-demographic determinants of AS among patients with small renal masses using multivariate logistic regression models. Results: We identified 59,189 patients who satisfied the inclusion criteria. Of the total cohort, 1,733 (2.9%) individuals received initial management with AS, while 57,456 (97.1%) received definitive treatment. There was a slight increase in initi...