Presurgical axitinib therapy increases fibrotic reactions within tumor thrombus in renal cell carcinoma with thrombus extending to the inferior vena cava

Effects of neoadjuvant VEGF‑TKI treatment on surgery for renal cell carcinoma: A systematic review and meta‑analysis

To evaluate the effects of neoadjuvant vascular endothelial growth factor-tyrosine kinase inhibitor (VEGF-TKI) treatment on surgery in patients with renal cell carcinoma (RCC), sources from Embase, PubMed and the Cochrane Library databases collected from inception to December, 2022 were used for analysis in the present study, according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Data regarding surgical outcomes were collected. The pooled effect sizes were calculated in terms of the risk ratio (RR)/standard mean difference (SMD) with 95% confidence intervals (CIs) using the random-effects model. Subgroup and sensitivity analyses were used to explore the source of heterogeneity within the data. In total, 9 identified articles involving 829 patients (336 in the neoadjuvant + surgery group; 493 in the surgery group) were included in the present study, according to the criteria. The results demonstrated that there were no significant differences in blood loss (SMD=-0.11; 95% CI, -0.63-0.41; P=0.68), postoperative length of hospital stay or total length of hospital stay (SMD=0.23; 95% CI, -0.55-1.01; P=0.57) or complications (RR=1.16; 95% CI, 0.80-1.67; P=0.44) between the two groups. However, neoadjuvant therapy reduced the operation time (SMD=-0.67; 95% CI, -1.25- -0.09; P=0.02) and resulted in a greater proportion of patients choosing partial nephrectomy (RR=1.84; 95% CI, 1.47-2.31; P<0.00001). In the subgroup analysis, the blood loss was significantly lower in patients with RCC with inferior vena cava tumor thrombus in the neoadjuvant group (SMD=-1.10; 95% CI, -1.82- -0.38; P=0.003). In conclusion, the results of the present study indicated that neoadjuvant VEGF-TKI treatment in patients with RCC shortened operation time, decreased blood loss and did not cause an increase in perioperative complications. In addition, this treatment modality may encourage patients to opt for partial nephrectomy to preserve renal function.

Neoadjuvant therapy in renal cell carcinoma with tumor thrombus: A systematic review and meta-analysis

To evaluate the efficacy, feasibility and safety of neoadjuvant therapy (NAT) for renal cell carcinoma with tumor thrombus (RCC-TT) in terms of response, perioperative and oncological outcomes, and compare the results between neoadjuvant and non-neoadjuvant groups. Overall, 29 single-arm studies and 5 cohort studies were included. Of the 204 patients undergoing NAT, 16.2% were level I, 35.3% level II, 24.0% level III and 18.6% level IV thrombus. Most of patients underwent preoperative targeted therapy, immunotherapy-based combination therapy was applied in 5.4% patients. The total reduction rate of thrombus level was 29.4%. NAT is associated with a shorter operative time, less blood loss (p<0.05 for both). Rate of complications and oncological outcomes were similar between two groups. Overall, 32.1% (34/106) ≥ grade 3 adverse events occurred in patients undergoing NAT. Neoadjuvant therapy is safe and feasible with acceptable perioperative outcomes in RCC-TT.

Integrative transcriptome and proteome analyses of clear cell renal cell carcinoma develop a prognostic classifier associated with thrombus

Clear cell renal cell carcinoma (ccRCC) with venous tumor thrombus (VTT) is associated with poor prognosis. Our integrative analyses of transcriptome and proteome reveal distinctive molecular features of ccRCC with VTT, and yield the development of a prognostic classifier to facilitate ccRCC molecular subtyping and treatment. The RNA sequencing and mass spectrometry were performed in normal-tumor-thrombus tissue triples of five ccRCC patients. Statistical analysis, GO and KEGG enrichment analysis, and protein-protein interaction network construction were used to interpret the transcriptomic and proteomic data. A six-gene-based classifier was developed to predict patients' survival using Cox regression, which was validated in an independent cohort. Transcriptomic analysis identified 1131 tumorigenesis-associated differentially expressed genes (DEGs) and 856 invasion-associated DEGs. Overexpression of transcription factor EGR2 in VTT indicated its important role in tumor invasion. Furthermore, proteomic analysis showed 597 tumorigenesis-associated differentially expressed proteins (DEPs) and 452 invasion-associated DEPs. The invasion-associated DEPs showed unique enrichment in DNA replication, lysine degradation, and PPAR signaling pathway. Integration of transcriptome and proteome reveals 142 tumorigenesis-associated proteins and 84 invasion-associated proteins displaying changes consistent with corresponding genes in transcriptomic profiling. Based on their different expression patterns among normal-tumor-thrombus triples, RAB25 and GGT5 were supposed to play a consistent role in both tumorigenesis and invasion processes, while SHMT2 and CADM4 might play the opposite roles in tumorigenesis and thrombus invasion. A prognostic classifier consisting of six DEGs (DEPTOR, DPEP1, NAT8, PLOD2, SLC7A5, SUSD2) performed satisfactorily in predicting survival of ccRCC patients (HR = 4.41, P < 0.001), which was further validated in an independent cohort of 40 cases (HR = 5.52, P = 0.026). Our study revealed the transcriptomic and proteomic profiles of ccRCC patients with VTT, and identified the distinctive molecular features associated with VTT. The six-gene-based prognostic classifier developed by integrative analyses may facilitate ccRCC molecular subtyping and treatment.

Dealing with malignancy involving the inferior vena cava in the 21st century

INTRODUCTION

Malignancies involving the inferior vena cava (IVC) have historically been considered not amendable to surgery. More recently, involvement of the IVC by neoplastic processes in the kidney, liver or in the retroperitoneum can be managed successfully.

EVIDENCE ACQUISITION

In this systematic review we summarize the current evidence regarding the surgical management of the IVC in cases of involvement in neoplastic processes. Current literature was searched, and studies selected on the base of the PRISMA guidelines. Evidence was synthesized in narrative form due to heterogeneity of studies.

EVIDENCE SYNTHESIS

Renal cell carcinoma accounts for the greatest proportion of studied patients and can be managed with partial or complete vascular exclusion of the IVC, thrombectomy and direct closure or patch repair with good oncological prognosis. Hepatic malignancies or metastases may involve the IVC, and the joint expertise of hepatobiliary and vascular surgeons has developed various strategies, according to the location of tumor and the need to perform a complete vascular exclusion above the hepatic veins. In retroperitoneal lymph node dissection, the IVC can be excised en-block to guarantee better oncological margins. Also, in retroperitoneal sarcomas not arising from the IVC a vascular substitution may be required to improve the overall survival by clearing all the neoplastic cells in the retroperitoneum. Leiomyoma can have a challenging presentation with involvement of the IVC requiring either thrombectomy, partial or complete substitution, with good oncological outcomes.

CONCLUSIONS

A multidisciplinary approach with specialist expertise is required when dealing with IVC involvement in surgical oncology. Multiple techniques and strategies are required to deliver the most efficient care and achieve the best possible overall survival. The main aim of these procedures must be the complete clearance of all neoplastic cells and achievement of a safe margin according to the perioperative treatment strategy.

A Phase II study of neoadjuvant axitinib for reducing the extent of venous tumour thrombus in clear cell renal cell cancer with venous invasion (NAXIVA)

BACKGROUND

Surgery for renal cell carcinoma (RCC) with venous tumour thrombus (VTT) extension into the renal vein (RV) and/or inferior vena cava (IVC) has high peri-surgical morbidity/mortality. NAXIVA assessed the response of VTT to axitinib, a potent tyrosine kinase inhibitor.

METHODS

NAXIVA was a single-arm, multi-centre, Phase 2 study. In total, 20 patients with resectable clear cell RCC and VTT received upto 8 weeks of pre-surgical axitinib. The primary endpoint was percentage of evaluable patients with VTT improvement by Mayo level on MRI. Secondary endpoints were percentage change in surgical approach and VTT length, response rate (RECISTv1.1) and surgical morbidity.

RESULTS

In all, 35% (7/20) patients with VTT had a reduction in Mayo level with axitinib: 37.5% (6/16) with IVC VTT and 25% (1/4) with RV-only VTT. No patients had an increase in Mayo level. In total, 75% (15/20) of patients had a reduction in VTT length. Overall, 41.2% (7/17) of patients who underwent surgery had less invasive surgery than originally planned. Non-responders exhibited lower baseline microvessel density (CD31), higher Ki67 and exhausted or regulatory T-cell phenotype.

CONCLUSIONS

NAXIVA provides the first Level II evidence that axitinib downstages VTT in a significant proportion of patients leading to reduction in the extent of surgery.

CLINICAL TRIAL REGISTRATION

NCT03494816.

Impact of cytoreductive nephrectomy in patients with primary metastatic renal cell carcinoma receiving systemic tyrosine kinase inhibitor therapy: A multicenter retrospective study

OBJECTIVES

To compare overall survival between patients with metastatic renal cell carcinoma treated by cytoreductive nephrectomy and those not treated by cytoreductive nephrectomy.

METHODS

We retrospectively evaluated 278 patients with metastatic renal cell carcinoma treated with first-line tyrosine kinase inhibitors between January 2008 and November 2019. Patients were divided into two groups: a cytoreductive nephrectomy group (immediate or deferred cytoreductive nephrectomy) and a group who received systemic tyrosine kinase inhibitor therapies alone without cytoreductive nephrectomy (control group). Overall survival comparisons were made in all patients in the control versus the cytoreductive nephrectomy group, the control versus the immediate cytoreductive nephrectomy group, the control versus the deferred cytoreductive nephrectomy group, and the deferred cytoreductive nephrectomy versus the immediate cytoreductive nephrectomy group. Analyses were weighted using the propensity score-based inverse probability of treatment weighting method to adjust for group imbalances.

RESULTS

The median (range) age of the patients was 65 (59-73) years. Of the 278 patients, 132 and 146 were in the control group and the cytoreductive nephrectomy (immediate, n = 107 and deferred, n = 39) group, respectively. A significant difference was noted between the control and cytoreductive nephrectomy groups in age, clinical stage, International Metastatic Renal Cell Carcinoma Database Consortium risk factors, and the number of metastatic sites. Inverse probability of treatment weighting-adjusted Cox regression analysis showed a significant difference in overall survival between the control and the cytoreductive nephrectomy groups and between the control and the immediate or deferred cytoreductive nephrectomy groups. However, there was no significant difference in overall survival between the immediate and the deferred cytoreductive nephrectomy groups.

CONCLUSIONS

Our findings suggest that metastatic renal cell carcinoma patients undergoing cytoreductive nephrectomy are more likely to have longer overall survival than those who receive tyrosine kinase inhibitor therapy only.

Complete response of renal cell carcinoma with an inferior vena cava tumor thrombus and lung metastases after treatment with nivolumab plus ipilimumab

In recent years, immune checkpoint inhibitors have become the most important drugs for treating renal cell carcinoma. In combination with performing nephrectomies, tyrosine kinase inhibitors have been used as neoadjuvant therapy, as they reduce the size of a primary renal mass and cause the disappearance of metastatic lesions. However, there are only a few reports on immune checkpoint inhibitors as neoadjuvant therapy. Herein, we report a case of renal cell carcinoma with multiple lung metastases and an inferior vena cava tumor thrombus that showed a complete response via radical nephrectomy after nivolumab plus ipilimumab. A 47-year-old man was diagnosed with renal cell carcinoma with multiple lung metastases and inferior vena cava tumor thrombus. After four treatment cycles of nivolumab plus ipilimumab and five cycles of nivolumab, we performed radical nephrectomy and resection of the thrombus tumor by excising a part of the inferior vena cava. The pathological diagnosis had no residual tumor. To our knowledge, this is the first case of complete disappearance of all malignant cells. Immunostaining of the primary renal mass revealed strong positivity for CD4 and CD8. The patient has been followed up without additional treatment for 8 months, but no recurrence has been observed. We suggest the use of nivolumab plus ipilimumab as neoadjuvant therapy. However, physicians should consider the possibilities of immune-related adverse events.

Presurgical Pazopanib Improves Surgical Outcomes for Renal Cell Carcinoma With High-level IVC Tumor Thrombosis

Background/ Aim: We evaluated surgical outcomes following nephrectomy and thrombectomy with and without presurgical treatment with pazopanib in patients with advanced renal cell carcinoma with inferior vena caval tumor thrombosis.

MATERIALS AND METHODS

We compared surgical outcomes between patients undergoing presurgical treatment with pazopanib vs. surgery-alone in 19 patients who underwent surgery for advanced renal cell carcinoma with high-level inferior vena caval tumor thrombosis at the Kobe University Hospital.

RESULTS

Comparing the presurgical group with the surgery-alone group, respectively, the average operative time was 497 min vs. 627 min (p=0.08); average blood loss was 1,928 ml vs. 7,393 ml (p<0.05); average postoperative hospitalization duration was 15.3 days vs. 21.6 days (p=0.05); and the perioperative complication rate was lower (presurgical: 33% vs. surgery-alone: 50%).

CONCLUSION

Presurgical treatment with pazopanib decreased surgical difficulty and improved surgical outcomes for advanced renal cell carcinoma with high-level inferior vena caval tumor thrombosis.

C-reactive protein/albumin ratio is a predictive factor for prognosis in patients with metastatic renal cell carcinoma

OBJECTIVES

To evaluate the effect of pretreatment C-reactive protein/albumin ratio and modified Glasgow prognostic score on the prognosis in patients with metastatic renal cell carcinoma.

METHODS

A retrospective study was carried out in 176 patients with metastatic renal cell carcinoma who received first-line tyrosine kinase inhibitors. The effect of adding inflammatory prognostic scores to the International Metastatic Renal Cell Carcinoma Database Consortium model (International Metastatic Renal Cell Carcinoma Database Consortium-C-reactive protein/albumin ratio and International Metastatic Renal Cell Carcinoma Database Consortium-Glasgow prognostic score models) on overall survival was evaluated using receiver operating characteristic curves. The prognostic value of inflammatory prognostic scores (C-reactive protein/albumin ratio-modified Glasgow prognostic score) was tested using the Kaplan-Meier method and Cox proportional regression models.

RESULTS

Patients were stratified into two groups using the cut-off value of 0.05: C-reactive protein/albumin ratio-low (<0.05) and C-reactive protein/albumin ratio-high (≥0.05). The area under the curve was significantly higher in the International Metastatic Renal Cell Carcinoma Database Consortium-C-reactive protein/albumin ratio model (0.720) than that of the International Metastatic Renal Cell Carcinoma Database Consortium model (0.689) and the International Metastatic Renal Cell Carcinoma Database Consortium-modified Glasgow prognostic score model (0.703). Significant differences were observed in overall survival stratified by the number of risk factors in the International Metastatic Renal Cell Carcinoma Database Consortium-C-reactive protein/albumin ratio risk model between one or two and three or four factors (P < 0.001), and three or four and five or more factors (P = 0.001). For the patients in the International Metastatic Renal Cell Carcinoma Database Consortium intermediate-risk group, overall survival was significantly different between the C-reactive protein/albumin ratio-low and -high groups (P = 0.001), whereas it was not significantly different between the patients with one and two International Metastatic Renal Cell Carcinoma Database Consortium risk factors (P = 0.106).

CONCLUSION

The C-reactive protein/albumin ratio is a simple and independent predictor of overall survival in patients with metastatic renal cell carcinoma. The predictive activity was significantly improved in the International Metastatic Renal Cell Carcinoma Database Consortium-C-reactive protein/albumin ratio model compared with the International Metastatic Renal Cell Carcinoma Database Consortium/International Metastatic Renal Cell Carcinoma Database Consortium-modified Glasgow prognostic score models.

Overview on the role of preoperative therapy in the management of kidney cancer

The advent of molecular therapy through targeted kinase inhibitors (TKI) has revolutionized the management of renal cell carcinoma. Although surgical resection remains the cornerstone of any therapeutic plan, an increased risk of morbidity and mortality can be of concern in large and complex bulky tumors. Preoperative therapy with TKIs is hypothesized to facilitate resectability, reduce surgical morbidity and allow nephron-sparing surgery. Many concerns on the safety, efficacy and tolerability of these agents before surgery have halted the progress in this setting. In this paper, we will review the indications and safety of preoperative TKIs in RCC as well as the future approaches.