Nephron-sparing Surgery In Patients Research Articles

The initial experience of robot-assisted nephron-sparing surgery in patients with renal cell cancer

Purpose of the study: analysis of our experience in performing robotic-assisted nephron-sparing surgeries using the da robotic system. Material and Methods. The retrospective study included the first 37 consecutive patients who underwent robot-assisted partial nephrectomy from May 2020 to december 2022. Results. To assess the surgical outcomes in patients undergoing partial nephrectomy, three parameters associated with trifecta achievement were analyzed. The trifecta was assessed according to the standard criteria, whereas the quadfecta, which in addition to the trifecta included preservation of >90 % of the glomerular filtration rate (calculated according to Cockroft–Gault) in the postoperative period (3–7 days), did not assess the stage of chronic renal failure one year after surgery, thus probably demonstrating the high percentage of its achievement (54.1 %). A positive surgical margin was observed in 1 (2.7 %) patients. Warm ischemia time of more than 25 minutes was used in 8 patients (21.6 %). Complications in the postoperative period (Clavien–dindo II and higher) were observed in 1 (2.7 %) patient. Trifecta and quadfecta rates were 78.4 % and 54.1 %, respectively. To analyze the surgeons’ experience, 37 renal cell cancer patients were divided into two subgroups with first 20 and subsequent robotic partial nephrectomies. There were no differences in gender, age and calculated RENAL value between 2 subgroups. depending on the surgeons’ experience, statistically significant differences in the duration of surgery (p=0.035) and blood loss during surgery (p=0.007) were found. Conclusion. Considering the extensive experience of surgeons in the field of laparoscopic surgery for tumors of the renal parenchyma, the outcomes of robotic partial nephrectomies performed in 37 patients seem to be satisfactory and successful. The accumulated experience of surgeons after 20 robotic-assisted nephron-sparing surgeries makes it possible to significantly reduce surgery time and blood loss. The technique of robotic-assisted partial nephrectomy requires further improvements.

Laparoscopic partial nephrectomy in obese patients: how can the body mass index influence the surgical and functional outcomes?

Objective: To evaluate the impact of body mass index (BMI) on surgical and functional outcomes of laparoscopic partial nephrectomy (LPN) for T1 renal tumors. Patients and methods: In this single-center retrospective study, 240 consecutive patients underwent LPN for localized, incidentally discovered renal masses of < 7 cm (cT1). Patients were categorized into four groups according to their BMI, as follows: group 1, normal weight (BMI < 25 kg/m2 ); group 2, overweight (BMI 25–29.9 kg/m2 ); group 3, obese (BMI 30–39.9 kg/m2 ); and group 4, morbidly obese (BMI ≥ 40 kg/m2 ). Results: Median operative time presented no statistically significant differences between BMI groups, whereas estimated blood loss was higher in morbidly obese patients than in all other groups. Warm ischemia time (WIT) and changes in eGFR were not influenced by the BMI groups but a decrease in the WIT was reported in obese and morbidly obese patients when an early unclamping technique (EUT) was used. An increase in BMI was not significantly associated with the occurrence of postoperative complications. In fact, the median complication rate was 3.3% for normal BMI, 4.5 % for overweight patients, 4.8% for obese patients, and 3.6% for morbidly obese patients. Conclusion: LPN could be considered a viable treatment option for renal masses amenable to nephron-sparing surgery in patients with higher BMI. An EUT should always be used in obese and morbidly obese individuals, considering the statistically significant decrease in WIT and the higher risk of chronic renal insufficiency in these patients.

A radiomics nomogram for preoperative prediction of nephron-sparing surgery in patients with bilateral Wilms tumor.

Bilateral Wilms tumor (BWT) is a relatively rare malignant renal tumor in children. Nephron-sparing surgery (NSS) is the preferred surgical approach for treating BWT, but lacks uniform surgical indications worldwide. This study aimed to summarize the clinical and imaging features of BWT children, establish a radiomics nomogram, and predict the feasibility of NSS for improving outcomes. A 12-year retrospective single-center review was conducted on clinical data and preoperative imaging features of BWT patients. The tumor kidneys were divided into NSS and non-NSS groups. Logistic regression analysis was performed to identify independent predictors and develop a prediction model of the feasibility of NSS in BWT patients. A radiomics nomogram was constructed and internally validated by the parametric bootstrapping method. A total of 58 BWT patients (115 renal units) were included in this study. After evaluations based on preoperative imaging and clinical data, 94 renal units underwent NSS with negative resection margins and were included in the NSS group, whereas 16 renal units with positive resection margins, macroscopic residual, or total nephrectomies were included in the non-NSS group. Tumor size [odds ratio (OR): 0.540, 95% confidence interval (CI): 0.308-0.945], relationship with the collecting system (OR: 0.013, 95% CI: 0.0004-0.370), and remaining renal parenchyma (RRP) proportion (OR: 71.23, 95% CI: 1.632-3108.8) were identified as independent predictors for NSS. A nomogram was constructed based on these factors, which demonstrated great consistency between the predicted and observed feasibility of NSS. The model presented with good discriminative ability [area under the curve (AUC), 0.982]. The decision curve analysis (DCA) revealed the clinical usefulness of the model. This study analyzed the clinical and preoperative imaging data of BWT patients and identified three independent predictors for the feasibility of NSS, including tumor size, relationship with the collecting system, and residual renal parenchyma proportion. The radiomics nomogram established in this study can provide individualized predictions to assist clinicians in making better decisions and improving patient outcomes.

Sutureless partial nephrectomy

Introduction. A century and a half of experience in renal surgery has shown the clinical feasibility of preserving a functioning renal parenchyma and the pathogenetic validity of nephron-sparing surgery (NSS) in renal cell carcinoma (RCC).Objective. To analyze the available scientific publications on nephron-sparing sutureless kidney surgery or without  so-called renorrhaphy.Materials and methods. We have searched the eLibrary, PubMed, Сochrane Library and Scopus databases without time limits. A total of 19365 publications were found in the databases, including 71 randomized controlled clinical trials, 987 reviews of which 168 were systematic and 2 were performed based on data from the Cochrane Library. This review includes publications on the sutureless NSS technique in patients with RCC; clinical cases and abstracts were excluded from the formal analysis of publications. Thus, 132 publications were selected for the analysis, which are presented in the following independently or included in previous literature reviews. The studies available for analysis were quite heterogeneous in terms of patient groups, inclusion criteria, and control points, which did not allow for a meta-analysis of the data presented.Results. An attempt to abandon the principle of kidney suturing after partial nephrectomy was implemented using methods of hemostasis based on the action of physical factors. At the same time, the value of any one of the methods that seemed at first glance did not show obvious unequivocal advantages in the NSS, the achievement of which would unequivocally reduce the severity of the problematic issue at the present stage. Significant prerequisites for such a state of the problem should be considered the monocentric nature of most studies and relatively little experience in the application of certain methods or their combinations. In the aspect of the foregoing, it is difficult to disagree with the statement that many different methods of hemostasis used during NSS appear not only to be the result of the tireless search for new opportunities by clinicians, but also the real lack of universal technologies.Conclusion. An analysis of the advantages and disadvantages of the final hemostasis methods during NSS in patients with localized RCC indicates that this problem has not been solved and requires further research.

Patient-specific hydrogel phantoms for the preoperative simulation of nephron-sparing surgery in Wilms’ tumor patients: A feasibility study

Nephron-sparing surgery (NSS) for Wilms Tumor patients has a positive surgical margin rate of 15.7–36.4%. Innovative approaches may reduce the occurrence of positive surgical margins in NSS and prevent these children from having additional radiotherapy and chemotherapy. The feasibility of performing mock surgery on patient-specific hydrogel phantoms of the kidney, tumor, and arterial vasculature for preoperative simulation of NSS was assessed in two patients. The development of patient-specific phantoms allowed the surgeon to practice surgery. Moreover, phantom specimens were assessed using MRI to understand the location and size of the smallest surgical margin. Surgeons reported that simulation surgery helped perform NSS safely and improved intraoperative tumor localization and resection planning. The technique is considered feasible and useful when preparing for NSS. In the future, this technique may further help to achieve negative surgical margins in NSS and may also allow the use of NSS in patients typically regarded as ineligible for this procedure.

Urine Macrophages Polarization Predicts Renal Function Recovery after Nephron-Sparing Surgery in Patients with Renal Cell Carcinoma

Introduction: This study was conducted to investigate the underlying associations between urine macrophages polarization and renal function recovery after nephron-sparing surgery (NSS) in patients with renal cell carcinoma (RCC) and to explore the potential application values of urine macrophages polarization in predicting the severity of renal ischemia/reperfusion injury (RIRI). Methods: Sixty-two patients with unilateral RCC who underwent NSS in our departments were prospectively recorded and followed up for long-term renal function to assess the onset of acute kidney injury (AKI) and chronic kidney disease (CKD). Urine samples of patients were collected 72 h after surgery for analyzing pro-inflammatory (classically activated/M1) and pro-reparative (alternatively activated/M2) macrophages polarization by flow cytometry. The detailed correlations between urine macrophages polarization and renal function recovery after NSS were explored by statistical analyses. Results: The cumulative incidence of postoperative AKI was 27.4% (17/62), and 47.0% (8/17) of those eventually developed to CKD during the follow-up. The mean urine M1/M2 ratio was 10.54 ± 8.13 in the AKI group and 3.93 ± 3.10 in the non-AKI group, presenting a significant statistical difference (p < 0.0001). Meanwhile, the urine M1/M2 ratio presented amazing potential in predicting postoperative CKD as well, with a mean ratio of 12.54 ± 9.41 in the CKD group and 4.28 ± 3.21 in the non-CKD group (p < 0.0001). Though univariate analysis implied that urine M1/M2 ratio was a relevant factor of both postoperative AKI and CKD in NSS surgical patients, multivariate analysis did not show satisfying predicting potential in postoperative CKD, mainly due to the very limited candidates enrolled in this study. Conclusion: Urine macrophages polarization could predict renal function recovery after NSS in patients with RCC. The urine M1/M2 ratio might a potential biomarker of RIRI but needs to be further verified in clinical settings.

Applicability of 14 Formulas for Estimating Glomerular Filtration Rate in the Evaluation of Renal Function before and after Nephron-Sparing Surgery in Patients with Renal Tumors.

To compare the applicability of 14 equations of estimating glomerular filtration rate (eGFR) before and after nephron-sparing surgery (NSS) for renal function assessment of patients with renal tumors. Preoperative and postoperative GFR is measured by emission computed tomography (ECT) with 99mTc-DTPA as an imaging agent as reference GFR (rGFR) to compare with all formulas. Spearman correlation analysis and Bland–Altman agreement analysis were used to evaluate the correlation between rGFR and eGFR1 to 14 before and after surgery. A total of 50 cases including 22 males and 28 females were included. The results of preoperative eGFR1–14 correlated with rGFR (P < 0.05). The calculation results of all estimation formulas have a significant correlation with preoperative GFR. Preoperative MDRD-I, CKD-EPI SCysC, and FAS Scr-SCysC have good consistency. The CG formula has the highest precision and FAS Scr-SCysC has the highest accuracy. A total of 30 patients followed up after surgery, and postoperative rGFR correlated with CG, CKD-EPI, FAS, and BIS formulas (P < 0.05). But postoperative rGFR has no significant correlation with MDRD and Schwartz (P > 0.05). Postoperative CKD-EPI Scr-SCysC has best consistency, and FAS Scr-SCysC has the highest accuracy and precision. Our data suggest that eGFR equations evaluated by both serum creatinine (Scr) and cystatin C (SCysC) is not necessarily better than those evaluated by one of them alone. Among all enrolled equations, FAS Scr-SCysC is the best one to evaluate postoperative GFR in patients with renal tumors.

Efficacy analysis of retroperitoneal laparoscopic selective renal artery branch occlusion and nephron sparing surgery for ≥ T1b stage renal carcinoma

Objective: To investigate the safety and efficacy of retroperitoneal laparoscopic selective renal artery branch occlusion with nephron sparing surgery in patients with renal carcinoma of stage ≥ T1b. Methods: From July 2016 to September 2020, 35 patients with renal cancer ≥T1b underwent retroperitoneoscopic nephron sparing surgery in the First Affiliated Hospital of Shenzhen University. The surgical methods were retroperitoneoscopic nephron sparing surgery with total renal artery occlusion (group A) or selective renal artery branch occlusion (group B). Operation time, heat ischemia time, blood transfusion rate, positive margin rate, intraoperative blood loss, postoperative complications and length of hospital stay were compared between the two groups, and the total glomerular filtration rate (GFR) and the single-nephron glomerular filtration rate (sGFR) of the offected kidneys were compared between the two groups before, 3 months after and 12 months after surgery. Results: Among the 35 patients, 19 were male and 16 were female, aged (55.7±8.4) years and the body mass index is (24.6±3.1) kg/m2. The tumor diameter was (54.7±10.3) mm. The difference was statistically significant of operative time between group A and B [(103.5±14.3) vs (123.2±14.1) min,P=0.003]. There were no significant differences in thermal ischemia time, blood transfusion rate, positive margin, intraoperative blood loss, incidence of postoperative complications and length of hospital stay between the two groups (all P>0.05). The decrease of renal sGFR in the group A was significantly higher than group B at 3 months and 12 months after surgery [(23.1±3.6) vs (29.1±7.1) ml/min;(25.9±4.7) vs (30.7±7.2),both P<0.05]. Conclusion: Retroperitoneal laparoscopic selective renal artery branch occlusion and neon-sparing surgery for patients with ≥ T1b stage renal carcinoma is a safe and effective surgical method, which can well protect the renal function of patients in the early postoperative stage without increasing intraoperative blood loss and postoperative complications.

Open nephron‐sparing surgery in patients with a complex tumour in a solitary kidney: technical, oncological and functional outcomes

Nephron Sparing Surgery (NSS) is the established treatment of choice for most T1 renal masses (1). By contrast a large and/or endophytic mass usually requires radical nephrectomy (RN) to reduce the risk of disappointing oncological outcomes. Yet, when a complex mass arises in a solitary kidney and partial nephrectomy (PN) is imperative, the oncological and the technical risks must be balanced against the benefits of avoiding dialysis. Complexity of renal tumours is best quantified by validated nephrometry scores e.g. PADUA (2). A PADUA score ≥10 is considered complex, typically indicating an endophytic, large (>7cm), central tumour. For a complex mass in a solitary kidney open excision under cold ischaemic conditions is still commonly performed as it can preserve renal function if prolonged ischaemia is anticipated (>30mins) (3).

Urinary Cyclophilin A as Marker of Tubular Cell Death and Kidney Injury.

Background: Despite the term acute kidney injury (AKI), clinical biomarkers for AKI reflect function rather than injury and independent markers of injury are needed. Tubular cell death, including necroptotic cell death, is a key feature of AKI. Cyclophilin A (CypA) is an intracellular protein that has been reported to be released during necroptosis. We have now explored CypA as a potential marker for kidney injury in cultured tubular cells and in clinical settings of ischemia-reperfusion injury (IRI), characterized by limitations of current diagnostic criteria for AKI. Methods: CypA was analyzed in cultured human and murine proximal tubular epithelial cells exposed to chemical hypoxia, hypoxia/reoxygenation (H/R) or other cell death (apoptosis, necroptosis, ferroptosis) inducers. Urinary levels of CypA (uCypA) were analyzed in patients after nephron sparing surgery (NSS) in which the contralateral kidney is not disturbed and kidney grafts with initial function. Results: Intracellular CypA remained unchanged while supernatant CypA increased in parallel to cell death induction. uCypA levels were higher in NSS patients with renal artery clamping (that is, with NSS-IRI) than in no clamping (NSS-no IRI), and in kidney transplantation (KT) recipients (KT-IRI) even in the presence of preserved or improving kidney function, while this was not the case for urinary Neutrophil gelatinase-associated lipocalin (NGAL). Furthermore, higher uCypA levels in NSS patients were associated with longer surgery duration and the incidence of AKI increased from 10% when using serum creatinine (sCr) or urinary output criteria to 36% when using high uCypA levels in NNS clamping patients. Conclusions: CypA is released by kidney tubular cells during different forms of cell death, and uCypA increased during IRI-induced clinical kidney injury independently from kidney function parameters. Thus, uCypA is a potential biomarker of kidney injury, which is independent from decreased kidney function.

Органосохраняющие операции при сложных опухолях почек

Aim To analyze the results of nephron sparing surgery (NSS) in patients with complex and large kidney tumors (R.E.N.A.L. 10-12). Materials and methods A total of 361 interventions for kidney neoplasm were performed from 2013 to 2018, including 207 (57,34%) NSS. The complex renal tumors were defined using R.E.N.A.L. nephrometry score. In 44 patients, tumors had a R.E.N.A.L. score of 10-12 (21,26%). Postoperative complications were classified using Clavien-Dindo system. Estimated glomerular filtration rate (eGFR) was assessed before operation and on the 1st-3rd postoperative day. Results Among tumors with R.E.N.A.L. score of 10-12, T1a, T1b and T2 stages were found in 13,64%, 70,45% and 15,91% cases, respectively. Robot-assisted partial nephrectomy was performed in 95%, while laparoscopic procedure was done in 5% of patients. Median operation time was 190 [170; 215] min, while median blood loss was 150 [100; 300] ml. There were 2 intraoperative complications (4,55%). Intraoperative complications were recorded in 2 (4.55%) patients. Postoperative complications developed in 22.73% of cases, including 3 patients with Grade I-II (6.82%) and 7 patients with Grade III complications (15.91%). Total, segmental ischemia and zero-ischemia was used in 31 (70.45%), 12 (27.27%) and 1 (2.27%) patients, respectively. The median duration of total ischemia was 20.0 [17; 25] min. A positive surgical margin was found in 1 (2.27%) patient. In 46.51% of cases, there was no decrease in eGFR in the early postoperative period. In 28% of patients, eGFR decreased by more than 20%. On average, GFR declined by 6.01%. Conclusion NSS in patients with complex renal tumors is an effective alternative to radical nephrectomy, which provides an acceptable level of postoperative complications, with moderate decrease in eGFR and low rate of positive surgical margin.

MRI-Based 3-Dimensional Visualization Workflow for the Preoperative Planning of Nephron-Sparing Surgery in Wilms’ Tumor Surgery: A Pilot Study

Purpose. Due to the size and localization of Wilms’ tumor (WT), nephron-sparing surgery (NSS) is only possible in a limited number of cases. When NSS is considered, the surgeon preoperatively requires a thorough understanding of the patient-specific anatomy to prevent positive surgical margins and other complications. Through a collaboration between the radiology and pediatric surgery departments and 3D imaging specialists, a 3D visualization workflow was developed to improve preoperative planning of NSS for WT patients. Methods. The 3D visualization workflow combines a MRA sequence, a segmentation protocol, and augmented reality (AR) visualization, additional to in-house 3D printing. A noncontrast-enhanced MRA scan was added to the MRI protocol. MRI sequences were segmented with a segmentation protocol in an open-source software package. The resulting 3D models were visualized in AR with a HoloLens and 3D print. Results. In a pilot study, five WT patients eligible for NSS were preoperatively planned through the 3D visualization workflow. AR visualization software was fast and free to use and allowed adequate handling of the 3D holograms. The 3D printed models were considered convenient and practical for intraoperative orientation. The patient-friendly, fast, and low-cost 3D visualization workflow was easily implemented and appeared to be valuable for the preparation of NSS. Conclusion. This pilot study demonstrates how a strong collaboration between the pediatric surgery and radiology departments and 3D imaging specialists will help to shape the future of pediatric oncological surgery. This 3D visualization workflow aims to prepare pediatric oncological surgeons for nephron-sparing surgery in patients with Wilms’ tumors.

V002 - Nephron sparing surgery in patients with extension of renal cell carcinoma to the main renal vein: Intrarenal and extrarenal thrombectomy

V002 - Nephron sparing surgery in patients with extension of renal cell carcinoma to the main renal vein: Intrarenal and extrarenal thrombectomy

Safety and efficacy of transperitoneal laparoscopic nephron sparing surgery in patients with previous abdominal surgery.

The aim of this study is to assess the safety and feasibility of the transperitoneal laparoscopic approach during nephron sparing surgery in patients with previous abdominal surgery. We retrospectively analyzed patients undergoing transperitoneal laparoscopic partial nephrectomy for renal masses. All patients had received a diagnosis of cT1a renal exophytic mass (⩽5 cm). Patients were divided into two groups, those with and without previous abdominal surgery. Patients with solitary kidney or major previous abdominal surgery were excluded in this study. The operative time, estimated blood loss, length of stay, surgical complications, and positive surgical margins were recorded to compare outcomes among two groups. Of the 157 patients who were included in our study, 71 (45.3%) had a history of abdominal surgery (Group 1), while the remaining 86 (54.7%) had not (Group 2). Cholecystectomy was the most common previous surgery performed near the renal fossa. Patients with previous abdominal surgery experienced increased operative time (111.5 vs 83.2 min; p = 0.001). However, no statistically significant difference was found in estimated blood loss (122.1 vs 114.4 mL; p = 0.363), length of stay (4.1 vs 3.8 days; p = 0.465), rate of conversion to open surgery (2.8% vs 2.3%; p = 0.234), and rate of complications (p = 0.121). However, operative time (p = 0.003) and length of stay (p < 0.001) were greater in patients with versus those without previous open cholecystectomy. Our results suggest that laparoscopic partial nephrectomy after minor previous abdominal surgery is safe and feasible in selected patients affected by renal masses with low nephrometry score. However, previous cholecystectomy results in an increased risk of conversion to open surgery and longer hospital stay in patients undergoing right laparoscopic partial nephrectomy.

Re: Postoperative Complications Increase the Risk of Long-Term Chronic Kidney Disease after Nephron-Sparing Surgery in Patients with Renal Cancer and Normal Preoperative Renal Function.

Re: Postoperative Complications Increase the Risk of Long-Term Chronic Kidney Disease after Nephron-Sparing Surgery in Patients with Renal Cancer and Normal Preoperative Renal Function.

Complications Following Nephron-Sparing Surgery for Wilms Tumor

PurposeBecause of the increasing use of nephron-sparing surgery (NSS) in bilateral Wilms tumor, we sought to review the early postoperative complications associated with NSS. MethodsA retrospective review of patients who underwent NSS at our institution from 2000 to 2017 was performed. For comparison, a cohort of patients who underwent radical nephrectomy (RN) was also reviewed. Early (30-day) postoperative complications and oncologic outcomes were assessed. ResultsFifty-five patients underwent either bilateral (46) NSS or unilateral (9) NSS owing to prior resection or congenital solitary kidney. Fifty-four patients who underwent unilateral RN were also evaluated. Twenty NSS patients (36.4%) experienced 21 postoperative complications, including prolonged urine leak (9), infection (8), transient renal insufficiency (1), and intussusception (3). Seven RN patients (13.0%) experienced surgical complications, including infection (4) and intussusception (3). Average intraoperative blood loss was significantly greater in NSS as compared to RN (483.51 ± 337.92 mL and 278.15 mL ± 390.25, respectively, p < 0.001), as was the incidence of positive tumor resection margins (20 [36.4%] and 12 [22.2%], respectively, (p = 0.037). ConclusionsIn our experience, prolonged urine leak, intraoperative blood loss, and positive margins were more frequent in patients undergoing NSS as compared to RN. However, the complications were successfully managed, suggesting that an aggressive approach to NSS in patients with bilateral Wilms tumor is safe and appropriate. Level of evidenceLevel III Type of studyTreatment study.

1050 - Impact of intraoperative bleeding on the risk of chronic kidney disease after elective nephron sparing surgery in patients with T1b kidney cancer

1050 - Impact of intraoperative bleeding on the risk of chronic kidney disease after elective nephron sparing surgery in patients with T1b kidney cancer

Active Surveillance Versus Nephron-Sparing Surgery for a Bosniak IIF or III Renal Cyst: A Cost-Effectiveness Analysis.

The objective of our study was to evaluate the cost-effectiveness of active surveillance (AS) versus nephron-sparing surgery (NSS) in patients with a Bosniak IIF or III renal cyst. Markov models were developed to estimate life expectancy and lifetime costs for 60-year-old patients with a Bosniak IIF or III renal cyst (the reference cases) managed by AS versus NSS. The models incorporated the malignancy rates, reclassification rates during follow-up, treatment effectiveness, complications and costs, and short- and long-term outcomes. An incremental cost-effectiveness analysis was performed to identify management preference under an assumed $75,000 per quality-adjusted life-year (QALY) societal willingness-to-pay threshold, using data from studies in the literature and the 2015 Medicare Physician Fee Schedule. The effects of key parameters were addressed in a multiway sensitivity analysis. The prevalence of malignancy for Bosniak IIF and III renal cysts was 26% (25/96) and 52% (542/1046). Under base case assumptions for Bosniak IIF cysts, the incremental cost-effectiveness ratio of NSS relative to AS was $731,309 per QALY for women, exceeding the assumed societal willingness-to-pay threshold, and AS outperformed NSS for both life expectancy and cost for men. For Bosniak III cysts, AS yielded greater life expectancy (24.8 and 19.4 more days) and lower lifetime costs (cost difference of $12,128 and $11,901) than NSS for men and women, indicating dominance of AS over NSS. Superiority of AS held true in sensitivity analyses for men 46 years old or older and women 57 years old or older even when all parameters were set to favor NSS. AS is more cost-effective than NSS for patients with a Bosniak IIF or III renal cyst.

Oncologic outcomes of nephron-sparing surgery in patients with T1 multifocal renal cell carcinoma

ObjectiveThis study is performed to explore the pathological characteristics and oncologic outcomes of T1 multifocal renal cell carcinoma (RCC).MethodsThe clinical data of 600 patients (442 males and 158 females) between the age of 29 and 73 years, diagnosed with T1 RCC were collected from three hospitals in China, out of which 421 cases had undergone nephron-sparing surgery (NSS) and 179 cases had undergone radical nephrectomy (RN) between December 2010 and January 2015.ResultsTumor was identified with multifocality in 32 patients (5.33%), out of which 21 were set to receive NSS, and 11 to receive RN, respectively; 21 cases of clear cell tumor, 8 cases of papillary tumor, 1 case of chromophobe tumor and 2 cases of Xp.11.2 translocation RCC. Among 568 cases of monofocal tumors, 400 patients underwent NSS, and the remaining 168 patients underwent RN, respectively. After a median follow-up of 5 years, 13 patients were found with recurrent tumors out of those who had undergone NSS, 11 with monofocal tumors and 2 with multifocal tumors containing satellite tumor nodules (p = 0.13). Out of the 32 individuals with multifocal RCC, 4 cases were reported to have died of cancer, 2 of NSS and 2 of RN. From these findings, the cancer-specific survival for NSS and RN was estimated to be 90.48% and 81.82%, respectively (p = 0.48).ConclusionThe findings from the study suggested that there were pathological differences in multifocal renal tumors, and that papillary carcinoma may be more common than clear cell carcinoma. The recurrence rate and survival rate of multifocal RCC were similar to monofocal tumors. Tumor recurrence may be related to satellite tumor nodules, which can only be detected once surgery is performed.

[45] Role of nephrometry scoring systems (R.E.N.A.L.-PADUA) in planning nephron-sparing surgery in patients with renal masses: Retrospective study of 88 cases

ObjectiveTo assess the utility of nephrometry scoring systems (R.E.N.A.L.-PADUA) in planning nephron-sparing surgery (NSS) in patients with renal masses. NSS has become the standard for the management of localised renal masses; however, an objective preoperative evaluation is needed. The nephrometry scores role is preoperative evaluation of the complexity of partial nephrectomy (PN) and evaluation of possible postoperative complications, and these scores are not yet standardly used in many countries including Algeria.