Germline Susceptibility to Renal Cell Carcinoma and Implications for Genetic Screening.

PURPOSE: Genetic susceptibility to nonsyndromic renal cell carcinoma (RCC) remains poorly understood, especially for different histological subtypes, as does variations in genetic predisposition in different populations. The objectives of this study were to identify risk genes for RCC in the Canadian population, investigate their clinical significance, and evaluate variations in germline pathogenic variants (PVs) among patients with RCC across the globe. MATERIALS AND METHODS: We conducted targeted sequencing of 19 RCC-related and 27 cancer predisposition genes for 960 patients with RCC from Canada and identified genes enriched in rare germline PVs in RCC compared with cancer-free controls. We combined our results with those reported for patients from Japan, the United Kingdom, and the United States to investigate PV variations in different populations. Furthermore, we evaluated the performance of referral criteria for genetic screening for including patients with rare PVs. RESULTS: We identified 39 germline PVs in 56 patients (5.8%) from the Canadian cohort. Compared with cancer-free controls, PVs in CHEK2 (odds ratio [OR], 4.8 [95% CI, 2.7 to 7.9], P = 3.94 × 10-5) and ATM (OR, 4.5 [95% CI, 2.0 to 8.7], P = .016) were significantly enriched in patients with clear cell, whereas PVs in FH (OR, 215.1 [95% CI, 64.4 to 597.8], P = 6.14 × 10-9) were enriched in patients with non-clear cell RCCs. PVs in BRCA1, BRCA2, and ATM were associated with metastasis (P = .003). Comparative analyses showed an enrichment of TP53 PVs in patients from Japan, of CHEK2 and ATM in patients from Canada, the United States and the United Kingdom, and of FH and BAP1 in the United States. CONCLUSION: CHEK2, ATM, and FH are risk genes for RCC in the Canadian population, whereas PVs in BRCA1/2 and ATM are associated with risk of metastasis. Globally, clinical guidelines for genetic screening in RCC fail to include more than 70% of patients with rare germline PVs.

Impact of Timing of Immunotherapy and Cytoreductive Nephrectomy in Metastatic Renal Cell Carcinoma: Real-World Data on Survival Outcomes from the CKCis Database.

Immunotherapy-based systemic treatment (ST) is the standard of care for most patients diagnosed with metastatic renal cell carcinoma (mRCC). Cytoreductive nephrectomy (CN) has historically shown benefit for select patients with mRCC, but its role and timing are not well understood in the era of immunotherapy. The primary objective of this study is to assess outcomes in patients who received ST only, CN followed by ST (CN-ST), and ST followed by CN (ST-CN). The Canadian Kidney Cancer information system (CKCis) database was queried to identify patients with de novo mRCC who received immunotherapy-based ST between January 2014 and June 2023. These patients were classified into three categories as described above. Cox proportional hazards models were used to assess the impact of the timing of ST and CN on overall survival (OS) and progression-free survival (PFS), after adjusting for the International Metastatic RCC Database Consortium (IMDC) risk group, age, and comorbidities. Best overall response and complications of ST and CN for these cohorts were collected. A total of 588 patients were included in this study: 331 patients received ST only, 215 patients received CN-ST, and 42 patients received ST-CN. Patient and disease characteristics including age, gender, performance status, IMDC risk category, comorbidity, histology, type of ST, and metastatic sites are reported. OS analysis favored patients who received ST-CN (hazard ratio [HR] 0.30, 95% confidence interval [CI] 0.13-0.68) and CN-ST (HR 0.68, CI 0.47-0.97) over patients who received ST only. PFS analysis showed a similar trend for ST-CN (HR 0.45, CI 0.26-0.77) and CN-ST (HR 0.9, CI 0.68-1.17). This study examined baseline features and outcomes associated with the use and timing of CN and ST using real-world data via a large Canadian real-world cohort. Patients selected to receive CN after ST demonstrated improved outcomes. There were no appreciable differences in perioperative complications across groups. Limitations include the small number of patients in the ST-CN group and residual confounding and selection biases that may influence the outcomes in patients undergoing CN.

Association of Cabozantinib Dose Reductions for Toxicity With Clinical Effectiveness in Metastatic Renal Cell Carcinoma (mRCC): Results From the Canadian Kidney Cancer Information System (CKCis).

BACKGROUND: Cabozantinib, an oral multi-targeted tyrosine kinase inhibitor (TKI), has demonstrated efficacy in metastatic renal cell carcinoma (mRCC). The association between toxicity and therapeutic effectiveness has been established with other TKIs. We investigated whether cabozantinib dose reductions, a surrogate for toxicity and adequate drug exposure, were associated with improved clinical outcomes in mRCC. METHODS: Employing the CKCis database, we analyzed patients treated with cabozantinib in the second line or later between 2011 to 2021. The cohort was stratified into those needing dose reductions (DR) during treatment and those not (no-DR). Outcomes, including objective response rate (ORR), time to treatment failure (TTF), and overall survival (OS), were compared based on dose reduction status. The influence of the initial dose on outcomes was also explored. RESULTS: Among 319 cabozantinib-treated patients, 48.3% underwent dose reductions. Response rates exhibited no significant difference between the DR and no-DR groups (15.1% vs. 18.2%, P = .55). Patients with DR had superior median OS (26.15 vs. 15.47 months, P = .019) and TTF (12.74 vs. 6.44 months, P = .022) compared to no-DR patients. These differences retained significance following adjustment for IMDC risk group (OS HR = 0.67, P = .032; TTF HR = 0.65, P = .008). There was no association between the initial dose and ORR, OS, or TTF. CONCLUSION: This study highlights the link between cabozantinib dose reductions due to toxicity and improved survival and time to treatment failure in mRCC patients. These findings underscore the potential of using on-treatment toxicity as an indicator of adequate drug exposure to individualize dosing and optimize treatment effectiveness. Larger studies are warranted to validate these results and develop individualized strategies for cabozantinib when given alone or in combination with immunotherapy.

The impact of robotic surgery access on the management of patients with clinical stage I kidney tumors.

INTRODUCTION: Robotic surgery is used in the treatment of kidney tumors. We aimed to determine if robotic access was associated with initial choice of management for patients with a clinical stage I kidney mass. METHODS: Patients with a clinical stage I kidney mass were identified from the Canadian Kidney Cancer information system (CKCis) cohort. Sites were classified by year and access to robotic surgery. Associations between robotic access and initial management were determined using logistic regression. Univariable and multivariable analyses were performed, adjusting for tumor size and stage, and presented as relative risks (RR ) or adjusted RR (aRR) and 95% confidence intervals (CI). RESULTS: Overall, 4160 patients were included. Among patients treated with surgery, the proportion of partial nephrectomy compared to radical nephrectomy was significantly higher in robotic sites (77.3% for robotic sites vs. 65.9% for non-robotic sites; RR 1.17, 95% CI 1.12-1.23, p<0.0001; aRR 1.12, 95% CI 1.08-1.17, p<0.0001). Patients receiving partial nephrectomy at sites with robotic access were more likely to receive a minimally invasive approach compared to patients at non-robotic sites (61.4% vs. 50.9%, RR 1.21, 95% CI 1.12-1.30; aRR 1.16, 95% CI 1.08-1.25, p<0.0001). The proportion of patients managed by active surveillance was not significantly different between robotic (405, 16.9%) and non-robotic (258, 14.7%) sites (RR 1.15, 95% CI 0.99-1.32; aRR 0.97, 95% CI 0.84-1.12). CONCLUSIONS: Access to robotic kidney surgery was associated with increased use of partial nephrectomy and minimally invasive partial nephrectomy. Use of active surveillance was similar at robotic and non-robotic institutions. Limitations of this study include lack of data on perioperative complications and cancer recurrence.

Real-world Assessment of Clinical Outcomes in Patients with Metastatic Renal Cell Carcinoma with or Without Sarcomatoid Features Treated with First-line Systemic Therapies.

BACKGROUND AND OBJECTIVE: Metastatic renal cell carcinoma (mRCC) patients have been reported to have better outcomes when treated with immunotherapies (IO) compared to targeted therapies (TT). This study aims to evaluate the impact of first-line systemic therapies on survival of mRCC patients with or without sarcomatoid features using real-world data. METHODS: Metastatic RCC patients of International mRCC Database Consortium (IMDC) intermediate or high risk, diagnosed from January 2011 to December 2022, treated with first-line systemic therapies, and with histological documentation of the presence or absence of sarcomatoid features in nephrectomy specimens were identified using the Canadian Kidney Cancer information system. Patients were classified by initial treatment: (1) targeted therapy (TT) used alone or (2) immunotherapy (IO)-based systemic therapies used in combination of either IO-IO or IO-TT. The inverse probability of treatment weighting using propensity scores was used to balance for covariates. Cox proportional hazard models were used to assess the impact of initial treatment received on overall survival (OS). KEY FINDINGS AND LIMITATIONS: Of the 1202 eligible patients, 791 were treated with TT and 411 with IO combinations. Of the patients, 76% were male, and the majority (91%) had a nephrectomy before systemic therapy. In nonsarcomatoid patients (639 TT and 320 IO patients), treatment with IO was associated with improved OS compared with patients treated with TT (median of 72 vs 48 mo, hazard ratio [HR] 0.63, 95% confidence interval [CI] 0.50-0.80, objective response rate [ORR] of 38.5% for IO and 23.5% for TT). In sarcomatoid patients (152 TT and 91 IO patients), treatment with IO was associated with improved OS (median of 48 vs 18 mo, HR 0.41, 95% CI 0.26-0.64, ORR of 49.5% for IO and 13.8% for TT). Similar results were observed in patients with synchronous metastatic disease only. CONCLUSIONS AND CLINICAL IMPLICATIONS: IO treatment was associated with improved survival in mRCC patients. The magnitude of benefit is increased in patients with sarcomatoid mRCC, consequently, identifying the sarcomatoid status early on could help healthcare providers make a better treatment decision. PATIENT SUMMARY: Metastatic renal cell carcinoma (mRCC) patients of International mRCC Database Consortium intermediate and high risk, diagnosed from January 2011 to December 2022, treated with first-line systemic therapies, and with histological documentation of the presence or absence of sarcomatoid features in nephrectomy specimens were identified using the Canadian Kidney Cancer information system (CKCis). In this study, treatment with immunotherapy was associated to an improved survival and response rates for mRCC patients with and without sarcomatoid features. The magnitude of benefit is increased in patients with sarcomatoid mRCC.

Trends of Utilization of Systemic Therapies for Metastatic Renal Cell Carcinoma in the Canadian Health Care System.

PURPOSE: Standard-of-care therapies for metastatic renal cell carcinoma (mRCC) have greatly evolved. However, the availability of emerging options in global health care systems can vary. We sought to describe the integration and usage of systemic therapies for mRCC in Canada since 2011. METHODS: We included patients with mRCC enrolled in the Canadian Kidney Cancer Information System, a prospective cohort of patients from 14 Canadian academic centers, who received systemic therapy from January 1, 2011, to December 31, 2021. Patients were stratified by treatment era (cohort 1: 2011-2015, cohort 2: 2016-2021). Stacked bar charts were used to present treatment proportions; Sankey diagrams were used to show the evolution of treatment sequencing between the two cohorts. RESULTS: Four thousand one hundred seven patients were diagnosed with mRCC, of whom 2,752 (67%) received systemic therapy. Among these patients, mean age was 64 years, 74% were male, 75% had clear cell histology, and International Metastatic RCC Database Consortium risk classification was favorable, intermediate, and poor in 16%, 56%, and 28%, respectively. Utilization of immune checkpoint inhibition (ICI)-based treatments has increased in Canada and reflects global and local patterns of approval and adoption. The use of therapies after doublet ICI has mostly shifted toward vascular endothelial growth factor-tyrosine kinase inhibitors (VEGF-TKIs) that were previously used in first line with subsequent treatments reflecting approved and available agents after previous VEGF-TKI. Clinical trial participation among patients who received systemic therapy was 18% in first, 21% in second, and 24% in third line. CONCLUSION: In Canada's publicly funded health care system, availability of standard mRCC therapies broadly reflects access from government-funded clinical trials and compassionate access program sources. In an evolving therapeutic landscape, ongoing advocacy is required to continue to facilitate patient access to efficacious therapies.

Chronic prednisone, metformin, and nonsteroidal anti-inflammatory drug use and clinical outcome in a cohort of bladder cancer patients undergoing radical cystectomy in Québec, Canada.

BACKGROUND: Studies have suggested a positive association between bladder cancer (BC) outcome and comedication use, including nonsteroidal anti-inflammatory drugs (NSAID), metformin, and prednisone use. To validate these associations, we evaluated whether these medications were associated with clinical outcome in a Canadian cohort of BC patients. METHODS: This is a retrospective cohort study on BC patients undergoing radical cystectomy (RC) in Québec province in 2000-2015, as registered in the provincial health administration databases. Medication use was considered chronic when prescribed for ≥ 1 year. Overall (OS), disease-specific (DSS) and recurrence-free (RFS) survival were compared using multivariable Cox proportional hazards models. Covariates included age, Charlson's comorbidity index, region of residence, year of RC, distance to hospital, hospital type, hospital and surgeon annual RC volume, neoadjuvant chemotherapy use, and type of bladder diversion, as well as mutual adjustment for concomitant comedication use (statins, NSAIDs, metformin, and prednisone). RESULTS: Of 3742 patients included, 293, 420, and 1503 patients chronically used prednisone, metformin, and NSAIDs before surgery, respectively. In multivariable analyses, preoperative prednisone use was associated with improved OS (HR 0.67, 95%CI 0.55-0.82), DSS (HR 0.58, 95%CI 0.45-0.76), and RFS (HR 0.61, 95%CI 0.47-0.78). Patients who chronically used metformin preoperatively had a worse OS (HR 1.29, 95%CI 1.07-1.55), DSS (HR 1.38, 95%CI 1.10-1.72), and RFS (HR 1.41, 95%CI 1.13-1.74). Preoperative, chronic NSAID use was not significantly associated with all clinical outcomes, with adjusted HRs for OS, DSS, and RFS of 1.10 (95%CI 0.95-1.27), 1.24 (95%CI 1.03-1.48), and 1.22 (95%CI 1.03-1.45), respectively. Directionality of findings was similar when stratifying by comedication use in the year following surgery. Results were similar after propensity-score matching too. CONCLUSIONS: In our Canadian cohort of BC undergoing RC, chronic prednisone use was associated with improved clinical outcomes, while metformin and NSAID were not.

Adjuvant therapy for renal cell carcinoma: 2023 Canadian Kidney Cancer Forum consensus statement.

INTRODUCTION: Several recent randomized trials evaluated the impact of adjuvant immune checkpoint inhibitor (ICI)-based therapy on post-surgical outcomes in renal cell carcinoma (RCC), with disparate results. The objective of this consensus statement is to provide data-driven guidance regarding the use of ICIs after complete resection of clear-cell RCC in a Canadian context. METHODS: An expert panel of genitourinary medical oncologists, urologic oncologists, and radiation oncologists with expertise in RCC management was convened in a dedicated session during the 2022 Canadian Kidney Cancer Forum in Toronto, Canada. Topic statements on the management of patients after surgery for RCC, including counselling, risk stratification, indications for medical oncology referral, appropriate followup, eligibility and management for adjuvant ICIs, as well as treatment options for patients with recurrence who received adjuvant immunotherapy, were discussed. Participants were asked to vote if they agreed or disagreed with each statement. Consensus was achieved if greater than 75% of participants agreed with the topic statement. RESULTS: A total of 22 RCC experts voted on 14 statements. Consensus was achieved on all topic statements. The panel felt patients with clear-cell RCC at increased risk of recurrence after surgery, as per the Keynote-564 group definitions, should be counselled about recurrence risk by a urologist, should be informed about the potential role of adjuvant ICI systemic therapy, and be offered referral to discuss risks and benefits with a medical oncologist. The panel felt that one year of pembrolizumab is currently the only regimen that should be considered if adjuvant therapy is selected. Panelists emphasized current opinions are based on disease-free survival given the available results. Significant uncertainty regarding the benefit and harms of adjuvant therapy remains, primarily due to a lack of consistent benefit observed across similar trials of adjuvant ICI-based therapies and immature overall survival (OS) data. CONCLUSIONS: This consensus document provides guidance from Canadian RCC experts regarding the potential role of ICI-based adjuvant systemic therapy after surgery. This rapidly evolving field requires frequent evidence-based re-evaluation.

Comparison of patients with renal cell carcinoma in adjuvant therapy trials to a real-world population.

PURPOSE: To compare characteristics and outcomes of patients included versus those not in adjuvant therapy trials post complete resection of renal cell carcinoma (RCC). METHODS: Adult patients following complete resection for clear cell RCC between January 1, 2011, and March 31, 2021, were included. Patients had intermediate high, high risk nonmetastatic disease (modified UCLA Integrated Staging System) or fully resected metastatic (M1) disease as per the inclusion criteria of adjuvant studies. Demographic, clinical, and outcomes between trial and nontrial patients were compared. RESULTS: Of 1,459 eligible patients, 63 (4.3%) participated in an adjuvant trial. Disease characteristics were similar between groups. Trial patients were younger (mean age 58.1 vs. 63.6 years; P < 0.0001) and had lower Charlson Comorbidity Index scores (mean 4.2 vs. 4.9; P = 0.009). Unadjusted disease-free survival (DFS) at 5 years for trial patients was 48.6% and 39.2% for nontrial patients (HR 0.71, 0.48-1.05, P = 0.08). Median DFS was higher for trial patients in comparison to nontrial patients (4.4 years, IQR 1.7- not reached; vs. 3.0 years, IQR 0.8-8.6; P = 0.08). Cancer specific survival (CSS) at 5 years for trial patients was 85.2% in comparison to 78.6% for nontrial patients (HR 0.45, 0.22-0.92, P = 0.03). Unadjusted estimated overall survival (OS) at 5 years was 80.8% for trial patients and 74.8% (HR 0.42, 0.18-0.94; P = 0.04) for nontrial patients. CONCLUSIONS: Patients in adjuvant trials were younger and healthier with longer CSS and OS in comparison to those not included in adjuvant trials. These findings may have implications when we generalize trial results to real world patients.

CT-based Bosniak classification of cystic renal lesions: is version 2019 an improvement on version 2005?

OBJECTIVE: To compare the diagnostic performance and inter-reader agreement of the CT-based v2019 versus v2005 Bosniak classification systems for risk stratification of cystic renal lesions (CRL). METHODS: This retrospective study included adult patients with CRL identified on CT scan between 2005 and 2018. The reference standard was histopathology or a minimum 4-year imaging follow-up. The studies were reviewed independently by five readers (three senior, two junior), blinded to pathology results and imaging follow-up, who assigned Bosniak categories based on the 2005 and 2019 versions. Diagnostic performance of v2005 and v2019 Bosniak classifications for distinguishing benign from malignant lesions was calculated by dichotomizing CRL into the potential for ablative therapy (III-IV) or conservative management (I-IIF). Inter-reader agreement was calculated using Light's Kappa. RESULTS: One hundred thirty-nine patients with 149 CRL (33 malignant) were included. v2005 and v2019 Bosniak classifications achieved similar diagnostic performance with a sensitivity of 91% vs 91% and a specificity of 89% vs 88%, respectively. Inter-reader agreement for overall Bosniak category assignment was substantial for v2005 (κ = 0.78) and v2019 (κ = 0.75) between senior readers but decreased for v2019 when the Bosniak classification was dichotomized to conservative management (I-IIF) or ablative therapy (III-IV) (0.80 vs 0.71, respectively). For v2019, wall thickness was the morphological feature with the poorest inter-reader agreement (κ = 0.43 and 0.18 for senior and junior readers, respectively). CONCLUSION: No significant improvement in diagnostic performance and inter-reader agreement was shown between v2005 and v2019. The observed decrease in inter-reader agreement in v2019 when dichotomized according to management strategy may reflect the more stringent morphological criteria. KEY POINTS: • Versions 2005 and 2019 Bosniak classifications achieved similar diagnostic performance, but the specificity of higher risk categories (III and IV) was not increased while one malignant lesion was downgraded to v2019 Bosniak category II (i.e., not subjected to further follow-up). • Inter-reader agreement was similar between v2005 and v2019 but moderately decreased for v2019 when the Bosniak classification was dichotomized according to the potential need for ablative therapies (I-II-IIF vs III-IV).

A Sarcomatoid Renal Cell Carcinoma with Clear Cell Papillary-Like Primary Tumor and Lymph Node Metastasis: A Diagnostic Conundrum.

Clear cell papillary renal cell tumor (CCPRCT) is a distinct clinical entity with characteristic pathological features and non-aggressive clinical behavior. Diagnostically challenging cases present when there are immunomorphological findings of CCPRCT associated with heterogeneous morphologies, aggressive histological features, and advanced pathological stages-so-called CCPRCT-like tumors. In this report, we describe a heterogeneous, multifocal renal tumor with immunomorphological characteristics of CCPRCT but with associated aggressive features such as sarcomatoid and necrotic areas, perirenal and sinus fat involvement, and most notably, lymph node metastasis composed entirely of classic CCPRCT morphology and immunophenotype. Immunohistochemical and fluorescence in situ hybridization studies did not support a translocation renal cell carcinoma. Molecular analyses did not identify common mutations or chromosomal abnormalities seen in clear cell renal cell carcinoma or ELOC-mutated renal cell carcinoma. This case highlights that rare renal cell tumors remain difficult to classify and the distinction between CCPRCT and CCPRCT-like tumors remains to be better defined.

Evaluating the impact of early identification of asymptomatic brain metastases in metastatic renal cell carcinoma.

BACKGROUND: Brain metastases (BM) in metastatic renal cell carcinoma (mRCC) have been reported to be present in up to 25% of patients diagnosed with mRCC. There is limited published literature evaluating the role of routine intra-cranial imaging for the screening of asymptomatic BM in mRCC. AIMS: To evaluate the potential utility of routine intra-cranial imaging, a retrospective cohort study was conducted to characterize the outcomes of mRCC patients who presented with asymptomatic BM, as compared to symptomatic BM. METHODS AND RESULTS: The Canadian Kidney Cancer Information System (CKCis) database was used to identify mRCC patients diagnosed with BM. This cohort was divided into two groups based on the presence or absence of BM symptoms. Details regarding patient demographics, disease characteristics, systemic treatments, BM characteristics and survival outcomes were extracted. Statistical analysis was through chi-square tests, analysis of variance, and Kaplan-Meier method to characterize survival outcomes. A p-value of <0.05 was considered statistically significant for all analyses. A total of 267 mRCC patients with BM were identified of which 106 (40%) presented with asymptomatic disease. The majority of patients presented with multiple (i.e., >1) BM (75%) with no significant differences noted in number of BM or BM-directed therapy received in symptomatic, as compared to asymptomatic BM patients. Median [95% confidence interval (CI)] overall survival (OS) from mRCC diagnosis was 42 months (95% CI: 32-62) for patients with asymptomatic BM, and 39 months (95% CI: 29-48) with symptomatic BM (p = 0.10). OS from time of BM diagnosis was 28 months (95% CI: 18-42) for the asymptomatic BM group, as compared to 13 months (95% CI: 10-21) in the symptomatic BM group (p = 0.04). CONCLUSIONS: Given a substantial proportion of patients may present with asymptomatic BM, limiting intra-cranial imaging to patients with symptomatic BM, may be associated with a missed opportunity for timely diagnosis and treatment. The utility of routine intra-cranial imaging in patients with renal cell carcinoma, warrants further prospective evaluation.

A Comparison of Percutaneous Ablation Therapy to Partial Nephrectomy for cT1a Renal Cancers: Results from the Canadian Kidney Cancer Information System.

PURPOSE: Percutaneous ablation therapy (AT) and partial nephrectomy (PN) are successful management strategies for T1a renal cancer. Our objective was to compare AT to PN with respect to recurrence-free survival (RFS) and overall survival (OS). MATERIALS AND METHODS: Patients post-PN or -AT for cT1aN0M0 renal cancer from 2011 to 2021 were identified from the national Canadian Kidney Cancer information system. Inverse probability of treatment weighting (IPTW) using propensity score (PS) was used. The primary outcomes, RFS and OS, were compared using Kaplan-Meier log-rank test analyses and Cox proportional hazard regression models. RESULTS: A total of 275 patients underwent AT and 2,001 underwent PN, with a median followup of 2.0 years (IQR 0.6-4.1). Covariates were well balanced between the AT and PN cohorts following PS matching. Two-year RFS following IPTW PS analysis for patients undergoing AT and PN was 88.1% and 97.4% (p <0.0001), respectively, while 2-year OS was 97.4% and 99.0% (p=0.7), respectively. Five-year RFS following IPTW PS analysis for patients undergoing AT and PN was 86.0% and 95.1%, respectively (p=0.003), while 5-year OS was 94.2% and 95.1%, respectively (p=0.9). Following IPTW PS analysis, treatment modality (PN vs AT) was a predictor of disease recurrence (HR 0.36, p=0.003) but not for OS (HR 0.96, p=0.9). CONCLUSIONS: With short followup, PN offers better RFS than AT, although no significant difference in OS was detected following PS adjustments. Both modalities can be offered to appropriately selected patients while we await prospective randomized data.

Ultrasound Correlates Highly With Cross Sectional Imaging for Small Renal Masses in a Contemporary Cohort.

OBJECTIVE: To determine the correlation between ultrasound (US), cross-sectional imaging, and pathological renal mass sizes. METHODS: Between January 2011 and January 2021, a cohort of patients from 14 academic institutions who had an US and cross-sectional imaging within 8 weeks of each other and within 6 months of surgery were identified. A second cohort of patients with small renal masses (≤4 cm) who had US and cross-sectional imaging within 8 weeks of each other were also examined, regardless of their treatment modality. Correlation coefficients, Bland-Altman plots, and sensitivity tables were generated. RESULTS: A total of 1464 patients were included in the surgical cohort and 1582 patients (1921 imaging pairs) were included in the small renal mass (SRM) cohort. Pearson correlation coefficients between computed tomography (CT)/magnetic resonance imaging (MRI) and pathologic size was 0.93 (P <.0001) and between US and pathological size was 0.90 (P <.0001). The correlation between US and CT/MRI was 0.93 (P <.0001). Bland-Altman plots demonstrated a greater agreement for smaller renal masses. For the SRM cohort when comparing US to CT/MRI, 1441 (75%) SRM measurements were within 0.5 cm and only 149 (7.8%) were greater than 1 cm in difference. Subgroup analysis demonstrated that correlation between US and CT/MRI for SRMs were higher in patients with lower body mass index. CONCLUSION: There is a strong correlation between US and cross-sectional imaging in 75% of patients at baseline imaging. Our study provides support for utilization of US for active surveillance.

Role of Serum Lymphocyte-derived Biomarkers in Nonmetastatic Muscle-invasive Bladder Cancer Patients Treated with Trimodal Therapy.

BACKGROUND: The role of serum lymphocyte-based biomarkers, such as the neutrophil-to-lymphocyte (NLR), lymphocyte-to-monocyte (LMR), and platelet-to-lymphocyte (PLR) ratios, was previously studied in patients with muscle-invasive bladder cancer (MIBC) treated with radical cystectomy but remains underexplored in patients treated with trimodal therapy (TMT). OBJECTIVE: To analyze the impact of serum lymphocyte-based biomarkers on main oncological outcomes after TMT for MIBC. DESIGN SETTING AND PARTICIPANTS: A retrospective study, including 176 patients treated with TMT for nonmetastatic MIBC (cT2-4/cN0-2) between 2001 and 2017 at a tertiary academic center, was conducted. INTERVENTION: TMT, consisting of initial maximal transurethral resection of the bladder tumor, followed by radiotherapy with concurrent chemotherapy. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Clinicopathological characteristics, serum laboratory tests, and imaging reports were collected. NLR, LMR, and PLR were calculated before and at the end of TMT. Dynamic patterns of NLR, LMR, and PLR during TMT were studied. Multivariable regression models were performed to estimate the effect of these biomarkers on complete response (CR) to TMT and survival. RESULTS AND LIMITATIONS: The median age was 75 yr (interquartile range 66-82). Staging was cT2 in 156 (89%) and cN0 in 159 (90%) patients. A pretreatment NLR (pre-NLR) of ≥4.0 was independently associated with lower CR rates (odds ratio 0.32; p = 0.013). In addition, a pre-NLR of ≥4.0 was associated with worse cancer-specific survival (hazard ratio [HR] 1.88; p = 0.032) and overall survival (OS; HR 1.61; p = 0.033) together with other factors such as hydronephrosis, Eastern Cooperative Oncology Group performance status, and cT stage 3-4a. When both pre- and post-treatment variables were considered, an increase in NLR beyond 75% during TMT (HR 1.63; p = 0.035) was associated with worse OS. This study was limited by its retrospective design. CONCLUSIONS: A high pre-NLR value was independently associated with lower rates of CR and worse survival in MIBC patients undergoing TMT. Prospective validation is needed to implement NLR into clinical practice. PATIENT SUMMARY: In this study, we reported the oncological outcomes of patients with muscle-invasive bladder cancer treated with trimodal therapy. We found that the neutrophil-to-lymphocyte ratio, a cheap and available blood-derived biomarker, was associated with response to trimodal therapy and survival outcomes.

Outcomes of Cytoreductive Nephrectomy for Patients with Metastatic Renal Cell Carcinoma: Real World Data from Canadian Centers.

BACKGROUND: Treatment options for metastatic renal cell carcinoma (mRCC) include cytoreductive nephrectomy (CN) and systemic therapy (ST). Results from the CARMENA and SURTIME trials suggest that CN before ST may not be the optimal treatment strategy for mRCC. OBJECTIVE: To use real-world data to evaluate and compare outcomes for patients with mRCC who underwent CN before, after, or without ST to those patients who only received ST. DESIGN, SETTING, AND PARTICIPANTS: The Canadian Kidney Cancer information system (CKCis) database was used to identify patients diagnosed with mRCC between January 2011 and April 2020. Only patients with synchronous disease, treated within 12 mo from their initial RCC diagnosis, with International Metastatic Renal Cell Carcinoma Database Consortium intermediate/high risk, and confirmed RCC histology were included. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS: Patients were classified into four groups according to the initial treatment received for mRCC. Inverse probability of treatment weighting using propensity scores was used to balance the treatment groups. Cox proportional hazards models were used to assess the impact of CN after adjusting for potential confounding variables in the weighted cohorts. RESULTS AND LIMITATIONS: A total of 788 patients were included in the study cohort. Of these 383 patients underwent CN before ST, 73 underwent CN after ST, 80 underwent CN only, and 252 patients received ST only. The median patient age was 63 yr and 73% of the cohort were men. In weighted analysis, the groups undergoing CN before ST (hazard ratio [HR] 0.65, 95% confidence interval [CI] 0.52-0.82) and CN after ST (HR 0.41, 95% CI 0.28-0.60) both had better survival compared to the ST only group. No survival benefit was observed for CN only compared to ST only, or for CN before ST compared to CN after ST. CONCLUSIONS: We evaluated the association between different sequences of treatment with CN and survival in patients with mRCC using CKCis real world data. The results demonstrate that the selected patients who undergo CN, whether performed before or after ST, have an associated improvement in survival. PATIENT SUMMARY: Two of the treatment options for metastatic kidney cancer are surgery and systemic therapy (chemotherapy or immunotherapy). We used data from the Canadian Kidney Cancer information system to determine whether there are differences in survival according to the sequencing of these treatments. Patients who had both surgery and systemic therapy, regardless of which treatment was first, had better survival than patients who only received systemic therapy.

Stereotactic Ablative Radiation Therapy for the Treatment of Upper Urinary Tract Urothelial Carcinoma.

PURPOSE: Urothelial carcinomas (UCs), also known as transitional cell carcinomas, account for the majority of upper urinary tract tumors. The gold-standard therapy for operable patients with localized disease is radical nephroureterectomy. However, some patients are not surgical candidates. Data on the use of modern radiation therapy for upper urinary tract UC (UTUC) are scarce. The purpose of this study was to assess the safety and efficacy of SABR in UTUC. METHODS AND MATERIALS: This retrospective study included all patients with UTUC treated with SABR at one institution. Charts were reviewed to evaluate renal function and the development of toxicity using Common Terminology Criteria for Adverse Events, version 3.0. Tumor response on follow-up imaging with computed tomography or magnetic resonance imaging scans was assessed using the Response Evaluation Criteria in Solid Tumors, version 1.1. RESULTS: A total of 16 patients (7 patients with UC at the ureter and 9 at the renal pelvis) were identified as treated with SABR. Of the 9 patients with renal pelvis UC, 4 had a previous history of bladder cancer. At the time of treatment, the median age was 85 years (range, 67-95 years). Most patients received 40 Gy in 8 fractions every second day. The median followup was 21 months (range, 3-110 months). Most patients maintained stable renal function, and only 2 patients developed worsening chronic kidney disease, but none required dialysis. Acutely, 4 patients developed grade 1 diarrhea, and 1 patient had new grade 1 hematuria. No chronic side effects were observed. One patient did not have follow-up imaging and was excluded from the tumor-response analysis. Two patients had a complete response of the treated lesion, 9 had a partial response, 2 had stable disease, and 2 had disease progression within the treatment field. CONCLUSIONS: This small case series suggests that SABR for UTUC is safe and well-tolerated, with good radiographic tumor response to ablative doses of radiation therapy.