Material and Methods
After institutional ethical committee approval obtained, the data of patients who underwent LPN or RPN in our center between April 2015 and November 2018 were evaluated for this study. Patients with a solitary kidney, zero ischemic PNs, retroperitoneal PNs, and who had a follow-up period of less than 1 year or with missing data were excluded from the study.
A total of 103 patients who underwent LPN (n = 31) and RPN (n= 72) were included in the study. Contrast-enhanced tomography (CT) or magnetic resonance imaging (MRI) was used to evaluate renal masses. Additional comorbidities such as chronic hypertension (HT) and diabetes mellitus (DM) that could affect RFs were recorded. Nephrometry risk scoring of renal masses was made according to RENAL (R (radius), E (exophytic/ endophytic), N (nearness), A (anterior), and L (location)) and PADUA (Preoperative Aspects and Dimensions Used for an Anatomical) scoring systems. The RENAL and PADUA scores were calculated by evaluating each anatomical parameter and tumor size according to described before[7,8].
The mean OT, WIT, estimated blood loss (EBL), conversion to open and conversion to RN, remove of lodge drain time, and LOS ​​were recorded as perioperative data. The OT recorded as the time between the first skin incision and the suturing of the incision site. The WIT was recorded as the time period between placing the bulldog clamp in the renal artery and opening this clamp.
For pathological parameters, histological subtypes, pathological stage, Furhman grade, and positive surgical margin (PSM) rates were recorded. Pathological staging was performed according to TNM classification. Preoperative and 1 year postoperative estimated glomerular filtration rate (eGFR) values ​​were calculated using the Modification of Diet in Renal Disease (MDRD) formula using age, gender, and ethnicity[9]. The changes between the two eGFR values ​​were recorded.