Follow-up and data collection
Patients were generally assessed in terms of renal function on
postoperative day one and subsequently every 12 months. Preoperative and
postoperative serum creatinine concentrations were obtained from the
medical records. This study’s primary endpoint, the eGFR, was calculated
with the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI)
equitation, and overall survival (OS) was defined as death from any
cause after surgery. CKD was staged according to the National Kidney
Foundation guidelines, and the baseline GFR was calculated using the
preoperative creatinine levels.