Limited use of surveillance imaging following nephrectomy for renal cell carcinoma

Abstract

ObjectivesTo evaluate the utilization of follow-up imaging after nephrectomy for renal cell carcinoma (RCC) in nationally representative data. Patients and methodsUsing Surveillance, Epidemiology, End Results data linked to Medicare records, we identified patients with RCC who received nephrectomy from 1991 to 2007. Patients were stratified by tumor stage. Postoperative chest and abdominal imaging (including chest x-ray, computed tomography scan, and magnetic resonance imaging; abdominal ultrasound, computed tomography scan, and magnetic resonance imaging) was assessed. Observed surveillance imaging frequency was compared to published protocols. Predictors of initial and continued yearly surveillance imaging were identified. ResultsAgreement between observed imaging frequency and evidence-based surveillance protocols was low, particularly for patients with T2–T4 disease. For patients who were not censored before 13 months, initial abdominal and chest surveillance imaging was obtained in 69% and 78% of patients, respectively. By year 5, 28% and 39% of patients with high-risk disease (T3 or T4), as compared to 21% and 25% of patients with low to moderate risk disease (T1 and T2), received yearly surveillance abdominal and chest imaging, respectively. High-risk disease was predictive of initial chest (odds ratio [OR] = 1.38) and abdominal (OR = 1.6) imaging, as well as continued yearly chest (hazard ratio [HR] = 0.73) and abdominal (HR = 0.74) imaging surveillance. For abdominal imaging, more contemporary year of surgery was predictive of initial (1997–2001, OR = 1.6; 2002–2007, OR = 2.4) and continued yearly surveillance (1997–2001, HR = 0.82; 2002–2007; HR = 0.67). ConclusionsIn the Medicare population, surveillance imaging is performed in a limited number of patients following nephrectomy for RCC. However, increasing tumor stage is predictive of both increased chest and abdominal imaging surveillance.