Oncologic Outcomes of Kidney-sparing Surgery Versus Radical Nephroureterectomy for Upper Tract Urothelial Carcinoma: A Systematic Review by the EAU Non-muscle Invasive Bladder Cancer Guidelines Panel

Prognostic impact of tumor size in ureteral cancer following segmental ureterectomy

OBJECTIVE

To evaluate the classification and prognostic effects of a 2 cm tumor size in patients with ureteral cancer (UC) undergoing segmental ureterectomy (SU).

PATIENTS AND METHODS

A total of 75 patients with UC who underwent SU in our hospital between April 2013 and April 2023 were included in this study. The study population was grouped based on tumor size, which was defined as the maximum diameter of the pathological specimens, resulting in 30 patients (40.0%) with tumor size <2 cm and 45 patients (60.0%) with tumor size ≥2 cm. The clinicopathological variables, perioperative parameters, and oncological outcomes were compared between the 2 groups. The endpoints were recurrence-free survival (RFS), and cancer-specific survival (CSS).

RESULTS

A tumor ≥2 cm was related to a higher positive rate of urine exfoliative cytology (P = 0.049) and fewer preoperative ureteroscopies (P = 0.033) than tumors <2 cm. After a follow-up of 6.3 to 128.7 months (median 40.2 months), 23 cases (30.7%) experienced recurrence and 11 patients (14.7%) succumbed to UC in the end. Compared to those with tumor size <2 cm, patients with tumor size ≥2 cm experienced more urothelial recurrence (P = 0.032). Kaplan-Meier analysis demonstrated that patients with tumor size ≥2 cm displayed inferior urothelial RFS than those with tumor size <2 cm (P = 0.026). Multivariate Cox analysis identified tumor size ≥2 cm, and pathological stage ≥T2 were significant prognostic factors of poor urothelial RFS (all P < 0.05).

CONCLUSION

Tumor size ≥2 cm was associated with a high rate of urothelial recurrence and served as an independent prognostic factor of adverse urothelial RFS in SU-treated patients with UC. Patients are advised to select surgical treatments for UC following the EAU guidelines.

[The metastatic and advanced upper tract urothelial carcinoma-a separate entity or bladder cancer's younger sibling?]

Upper tract urothelial carcinoma (UTUC) is a cancer that is often already in an advanced stage at the time of initial diagnosis. Although urothelial carcinoma of the upper and lower urinary tracts both originate from the urothelium and have similar genetic alterations, there are significant differences in their distribution. In localized high-risk UTUC, radical nephroureterectomy is the gold standard therapy. In metastatic UTUC, major changes are emerging in sequential therapy due to the investigation of new classes of drugs. In addition to platinum-based combination chemotherapy and immunotherapy, new substances such as antibody-drug conjugates (ADCs) and FGFR inhibitors are used.

A urine-based liquid biopsy for detection of upper tract urothelial carcinoma: a self-matched study

BACKGROUND

To establish the pathological diagnosis of UTUC before treatment is profitable. At present, the conventional pathological diagnostic methods have certain problems. Besides, the urine-based DNA methylation test have been already utilized to detect bladder cancer.

OBJECTIVE

To evaluate the sensitivity and specificity of DNA methylation plus 17 genes mutation test and compare the combined test with cytology.

MATERIALS AND METHODS

We included 45 patients from April 2019 to May 2022, all of whom underwent radical nephroureterectomy (RNU), nephrectomy, diagnostic ureteroscopy or tissue biopsy. Before surgery, the urine samples were collected for DNA methylation plus 17 genes mutation test and cytology. The test performance was calculated, and comparative ROC curves were drawn.

RESULTS

The median age of the patients was 67 years. The Kappa value of the DNA methylation plus 17 genes mutation test and tissue pathology was 0.59 (p<0.001). The sensitivity/specificity/PPV/NPV of DNA methylation plus 17 genes mutation test was 86/80/94/62% compared with 29/100/100/29% for cytology. The AUC of DNA methylation plus 17 genes mutation test was 0.829 (p<0.001).The mutated gene proportion of UTUC patients was 51.43% for TERT and 25.71% for TP53.

CONCLUSION

The test performance of DNA methylation plus 17 genes mutation test was satisfactory, which may replace cytology in the future. Further multicenter studies with larger samples are needed to confirm the clinical value of this promising method.

NOVELTY & IMPACT STATEMENTS

We evaluated the diagnostic efficacy of a urine-based liquid biopsy for the detection of UTUC and compared the combined test with cytology. We found satisfactory results and concluded that the test could partly replace cytology. Further studies are needed.

Disitamab vedotin (RC48) long-term regimen in a post-nephroureterectomy patient with metastases: a case report

Background

For patients with metastatic upper tract urothelial carcinoma (UTUC), the preferred first-line treatment is platinum-based chemotherapy. Immunotherapy can be considered a subsequent treatment if the chemotherapy is ineffective or the disease progresses. However, how should treatment be administered if immunotherapy is useless and the patient cannot take chemotherapy? Especially in patients who have metastasized after radical nephroureterectomy (RNU).

Case presentation

A 68-year-old woman was admitted to the hospital due to left flank pain for two weeks and was diagnosed with metastatic UTUC after RNU. The patient underwent systemic chemotherapy with gemcitabine and cisplatin (GC), as well as reduced-dose GC, but developed myelosuppression. Immunotherapy was ineffective, so Disitamab vedotin (RC48) was chosen.

Results

Disitamab vedotin (RC48) monotherapy was administered for 13 cycles, during which thyroid function remained normal, the patient responded well to the treatment, and the disease was controlled well. In the subsequent two years of follow-up, there was no disease recurrence.

Conclusion

The long-term treatment regimen with RC48 is feasible for metastatic UTUC after RNU, and RC48 monotherapy is suitable as first-line therapy for selected patients.

HER2 expression in upper tract urothelial carcinoma and the relationship with clinicopathological characteristics-an analysis of 155 patients in Southwest China

OBJECTIVE

We aimed to evaluate the expression of HER2 in patients with upper tract urothelial carcinoma (UTUC) in Southwest China by using a relatively large cohort, and to determine the relationship between HER2 expression and clinicopathological characters.

MATERIALS AND METHODS

We retrospectively enrolled the clinical data of 155 UTUC patients who have undergone radical nephroureterectomy (RNU) from March 2019 to September 2022. HER2 expression was assessed using immunohistochemistry and scored according to the HercepTest (Scores of 0 or 1 + were considered as negative and 2 + or 3 + as positive). Tumor molecular phenotype was classified by the panel of CK20, CK5/6, and CD44.

RESULTS

HER2 was overexpressed in 55 (35.5%) patients. It was associated with pathologic characteristics such as grade (p = 0.017), tumor molecular phenotype (p < 0.001) and Ki-67 expression (p = 0.017). On univariate and multivariable logistic regression analysis, HER2 overexpression remained associated with higher grade (HR, 10.6; 95% CI 1.0-112.6; p = 0.050) and luminal molecular phenotype (HR, 8.0; 95% CI 1,6-38.4; p = 0.010). During disease progression after nephroureterectomy, the phenotype of the tumor might change and a switch phenomenon in phenotype after recurrence in the bladder was reported.

CONCLUSION

According to our study, in Southwest China, one-third of UTUC patients overexpressed HER2. Tumors with high grade or luminal phenotype tended to be HER2 positive. HER2 may represent a promising target for therapy in UTUC.

[Organ-preserving treatment for urothelial carcinoma of the upper urinary tract]

Urothelial carcinoma of the upper urinary tract is rare but the incidence is currently increasing in western countries. Radical nephroureterectomy has long been the standard treatment; however, it can lead to chronic kidney failure and also the necessity for dialysis. Therefore, organ-preserving treatment is now recommended for selected patients with low-risk tumors. The choice of treatment depends on the tumor characteristics, comorbidities and individual risk factors. Surgical options for organ preservation include ureterorenoscopy (URS), percutaneous treatment and partial ureteral resection. The URS is the most frequently used method for organ preservation. Photodynamic diagnostics (PDD) and narrow band imaging (NBI) can potentially also be used for tumor detection in the upper urinary tract. Conservative options such as topical treatment with mitomycin C or Bacillus Calmette-Guérin (BCG) and systemic treatment options are also possible.

Polypyrrole/iron-glycol chitosan nanozymes mediate M1 macrophages to enhance the X-ray-triggered photodynamic therapy for bladder cancer by promoting antitumor immunity

X-ray Photodynamic Therapy (XPDT) is an emerging, deeply penetrating, and non-invasive tumor treatment that stimulates robust antitumor immune responses. However, its efficacy is often limited by low therapeutic delivery and immunosuppressant within the tumor microenvironment. This challenge can potentially be addressed by utilizing X-ray responsive iron-glycol chitosan-polypyrrole nanozymes (GCS-I-PPy NZs), which activate M1 macrophages. These nanozymes increase tumor infiltration and enhance the macrophages' intrinsic immune response and their ability to stimulate adaptive immunity. Authors have designed biocompatible, photosensitizer-containing GCS-I-PPy NZs using oxidation/reduction reactions. These nanozymes were internalized by M1 macrophages to form RAW-GCS-I-PPy NZs. Authors' results demonstrated that these engineered macrophages effectively delivered the nanozymes with potentially high tumor accumulation. Within the tumor microenvironment, the accumulated GCS-I-PPy NZs underwent X-ray irradiation, generating reactive oxygen species (ROS). This ROS augmentation significantly enhanced the therapeutic effect of XPDT and synergistically promoted T cell infiltration into the tumor. These findings suggest that nano-engineered M1 macrophages can effectively boost the immune effects of XPDT, providing a promising strategy for enhancing cancer immunotherapy. The ability of GCS-I-PPy NZs to mediate M1 macrophage activation and increase tumor infiltration highlights their potential in overcoming the limitations of current XPDT approaches and improving therapeutic outcomes in melanoma and other cancers.

Decisional and prognostic impact of diagnostic ureteroscopy in high-risk upper tract urothelial carcinoma: A multi-institutional collaborative analysis (ROBUUST collaborative group)

BACKGROUND

Diagnostic ureteroscopy (URS) with or without biopsy remains a subject of contention in the management of upper tract urothelial carcinoma (UTUC), with varying recommendations across different guidelines. The study aims to analyse the decision-making and prognostic role of diagnostic ureteroscopy (URS) in high-risk UTUC patients undergoing curative surgery.

MATERIALS AND METHODS

In this retrospective multi-institutional analysis of high-risk UTUC patients from the ROBUUST dataset, a comparison between patients who received or not preoperative URS and biopsy before curative surgery was carried out. Logistic regression analysis evaluated differences between patients receiving URS and its impact on treatment strategy. Survival analysis included 5-year recurrence-free survival (RFS), metastasis-free survival (MFS), cancer-specific survival (CSS) and overall survival (OS). After adjusting for high-risk prognostic group features, Cox proportional hazard model estimated significant predictors of time-to-event outcomes.

RESULTS

Overall, 1,912 patients were included, 1,035 with preoperative URS and biopsy and 877 without. Median follow-up: 24 months. Robot-assisted radical nephroureterectomy was the most common procedure (55.1%), in both subgroups. The 5-year OS (P = 0.04) and CSS (P < 0.001) were significantly higher for patients undergoing URS. The 5-year RFS (P = 0.6), and MFS (P = 0.3) were comparable between the 2 groups. Preoperative URS and biopsy were neither a significant predictor of worse oncological outcomes nor of a specific treatment modality.

CONCLUSIONS

The advantage in terms of OS and CSS in patients undergoing preoperative URS could derive from a better selection of candidates for curative treatment. The treatment strategy is likely more influenced by tumor features than by URS findings.

Impact of surgical management of upper tract urothelial cancer in octogenarians: A population-based study

Background

Upper tract urothelial carcinoma (UTUC) is an aggressive disease with a high progression rate. The standardmanagement for this disease is nephroureterectomy. Nephron sparing nonradical surgery is an alternative therapeutic approach. In men with limited life expectancy, the potential harm of UTUC progression must be weighed against surgical morbidity and mortality, and thus, more conservative approaches may be selected. This study aims to investigate the comparative benefits of radical and conservative surgical management in patients older than 80 years with localized UTUC.

Materials and methods

A search was conducted in the Surveillance, Epidemiology, and End Results database for patients older than 80 years who were diagnosed with localized (T1-2N0M0) cancer in the renal pelvis or ureter as the only malignancy from 2004 to 2015. Patients were divided into 3 therapeutic groups: no surgery, local intervention (ie, local tumor excision or segmented ureterectomy), and radical surgery (nephroureterectomy). Demographic and cancer-related parameter data were collected. Logistic regression analysis was conducted to investigate predictors for surgical treatment. Kaplan-Meier curves and Cox regression were used to analyze survival outcomes.

Results

Data from 774 patients were analyzed, including 205 in the no-surgery group, 181 in the local intervention group, and 388 in the radical surgery group. Older, African American patients with T1 stage disease were less likely to receive surgical treatment. Among surgically treated patients, renal pelvic tumors, and high-grade and T2 stage disease were associated with radical resection. Surgically treated patients had a longer median overall survival (OS) than in those treated nonsurgically (13, 35, and 47 months in no-surgery, local intervention, and radical surgery groups, respectively; p < 0.001). Although surgically treated patients demonstrated higher 5-year OS (8.8% [no surgery], 23.2% [local intervention], and 23.5% [radical surgery], p < 0.001) and 5-year disease-specific survival (DSS) (41.0%[no surgery], 69.1%[local intervention], and 72.9%[radical surgery]; p < 0.001) than in those treated nonsurgically, no significant differences were found between the local intervention and radical surgery groups (p > 0.05). Based on multivariate Cox regression analysis, surgical treatments, including both nonradical and radical resection, were independently associated with improved OS and DSS after controlling for age, marital status, tumor grade, and radiation status.

Conclusions

Patients older than 80 years with localized UTUC who undergo surgery demonstrate longer survival. Radical and nonradical resections seemto have similar OS and DSS outcomes. Thus, when clinically indicated in this population, a more conservative surgical approach may be reasonable.

Revitalizing Bacillus Calmette-Guérin Immunotherapy for Bladder Cancer: Nanotechnology and Bioengineering Approaches

Bacillus Calmette-Guérin (BCG) immunotherapy has been a cornerstone treatment for non-muscle-invasive bladder cancer for decades and still faces challenges, such as severe immune adverse reactions, which reduce its use as a first-line treatment. This review examines BCG therapy's history, mechanisms, and current status, highlighting how nanotechnology and bioengineering are revitalizing its application. We discuss novel nanocarrier systems aimed at enhancing BCG's efficacy while mitigating specific side effects. These approaches promise improved tumor targeting, better drug loading, and an enhanced stimulation of anti-tumor immune responses. Key strategies involve using materials such as liposomes, polymers, and magnetic particles to encapsulate BCG or functional BCG cell wall components. Additionally, co-delivering BCG with chemotherapeutics enhances drug targeting and tumor-killing effects while reducing drug toxicity, with some studies even achieving synergistic effects. While most studies remain experimental, this research direction offers hope for overcoming BCG's limitations and advancing bladder cancer immunotherapy. Further elucidation of BCG's mechanisms and rigorous safety evaluations of new delivery systems will be crucial for translating these innovations into clinical practice.

Long segment ureterectomy with tapered demucosalized ileum replacement of ureter for ureteral cancer: a case report and literature review

Radical nephroureterectomy (RNU) with bladder sleeve resection is currently the gold standard for the treatment of high-risk ureteral cancer. However, in certain special cases, such as bilateral upper tract urothelial carcinoma(UTUC), isolated and chronic kidney disease, and low-risk UTUC, kidney sparing surgery(KSS) may represent a viable alternative, though it remains highly challenging. The current KSS options for ureteral cancer include endoscopic treatment, segmental ureterectomy, total ureterectomy combined with kidney autotransplantation and nephrostomy. These methods are associated with significant disadvantages, such as a high risk of recurrence and vascular-related complications. On the basis of previous studies, we creatively proposed a surgical method of long segment ureterectomy with tapered demucosalized ileum(TDI) replacement of the ureter for ureteral cancer, and successfully performed this operation on a patient with ureteral cancer. The follow-up results showed that this surgical method provides good tumor control while preserving the patient's renal function and improves the inherent defect of the ileal replacement of the ureter, which is a feasible choice for patients with ureteral cancer and kidney preservation.

Henderickx M, van Moorselaar RJA, Kamphuis GM, Baard J. Navigating the Aftermath: A Comprehensive Scoping Review on Follow-up Strategies After Kidney-sparing Surgery for Upper Tract Urothelial Carcinoma

Background and objective

Upper tract urothelial carcinoma (UTUC) can be managed efficiently and safely through kidney-sparing surgery (KSS) in selected patient groups. However, the most effective and efficient postoperative surveillance strategy remains undetermined. We aimed to provide a comprehensive synopsis of the follow-up strategies and survival outcomes in patients diagnosed with UTUC treated by KSS.

Methods

Following the systematic methodology outlined in the Preferred Reporting Items for Systematic Reviews and Meta-analyses Extension for Scoping Reviews, we conducted searches in four databases (MEDLINE [Ovid], Embase [Ovid], Cochrane Library, and Web of Science) up until December 11, 2023.

Key findings and limitations

A total of 3121 articles underwent screening, of which 19 were selected for inclusion in this review. The follow-up schedules after KSS exhibited considerable variability among the included studies. Diagnostic modalities employed consisted of computed tomography urography (present in 84% of protocols), X urography (21%), ultrasound (21%), thoracic imaging (26%), voided urine cytology (89%), selective upper tract cytology (5.3%), cystoscopy (84%), and ureterorenoscopy (53%) at varying frequencies. At 5 yr of follow-up, the reported recurrence-free survival rate ranged from 30% to 86%, overall survival was 50-92%, and metastasis-free survival was 77-90%.

Conclusions and clinical implications

This review unveils significant heterogeneity in clinical practices and survival outcomes, indicating disparities between real-world approaches and guideline recommendations. The lack of consensus on follow-up schemes is evident, emphasising the necessity for future initiatives aimed at developing a comprehensive protocol.

Patient summary

This review shows significant heterogeneity in follow-up strategies after kidney-sparing surgery for upper tract urothelial carcinoma. A lack of evidence contributes to discrepancies between guidelines and real-world approaches. Thus, future endeavours should aim at establishing a comprehensive protocol.

Sequential endoluminal gemcitabine and docetaxel vs. Bacillus Calmette-Guérin for the treatment of upper tract carcinoma in situ

INTRODUCTION

Nephroureterectomy is commonly performed for high-grade (HG) upper tract (UT) urothelial carcinoma (UC). However, some patients may benefit from a de-escalation of surgical management, particularly for noninvasive disease and carcinoma in situ (CIS). Bacillus Calmette-Guerin (BCG) is currently the only guideline-recommended endoluminal treatment option. Gemcitabine/Docetaxel (Gem/Doce) has shown promising efficacy as a treatment for noninvasive HG UTUC, though a comparison to BCG is lacking. We report the outcomes of patients treated with endoluminal Gem/Doce vs. BCG for UT-CIS.

METHODS

A single-institutional retrospective review of patients treated with Gem/Doce vs. BCG for UT-CIS was performed. Treatment was instilled via nephrostomy or retrograde ureteral catheter. In both treatment groups, induction consisted of 6 weekly instillations. Maintenance was initiated if disease-free and consisted of 6 monthly instillations in the Gem/Doce group and a reduced dose (one-tenth) 3-week course at 3 months in the BCG group. Recurrence was defined as biopsy-proven disease or HG cytology.

RESULTS

The final cohort included 53 patients with 65 upper tract units; 31 received BCG and 34 received Gem/Doce. Median follow-up was 88 and 29 months in the BCG and Gem/Doce groups, respectively. Presenting pathology included biopsy-proven CIS and HG cytology in 9.7% and 90% of the BCG group, and 8.8% and 91% of the Gem/Doce group, respectively. The 2-year estimates for recurrence-free and nephroureterectomy-free survival were 61% and 89% for the BCG group and 54% and 100% for the Gem/Doce group, respectively. Upon multivariable analysis, instillation via percutaneous nephrostomy tube was associated with an increased risk of recurrence (HR 3.89, 95% CI 1.59-9.53). The development of any symptom was not statistically different between treatment groups (P = 0.12). There were 2 treatment-related deaths that occurred, 1 within each treatment group.

CONCLUSION

Endoluminal Gem/Doce and BCG have similar oncological outcomes and major adverse event rates in the treatment of UT-CIS. Further prospective evaluation is warranted.

Robotic distal ureterectomy for high-risk distal ureteral urothelial carcinoma: a retrospective multicenter comparative analysis (ROBUUST 2.0 collaborative group)

BACKGROUND

The role of kidney-sparing surgery in patients with high-risk upper urinary tract urothelial carcinoma is controversial. The present study aimed to assess oncological and functional outcomes of robot-assisted distal ureterectomy in patients with high-risk distal ureteral tumors.

METHODS

The ROBUUST 2.0 multicenter international (2015-2022) dataset was used for this retrospective cohort analysis. High-risk patients with distal ureteral tumors were divided based on type of surgery: robot-assisted distal ureterectomy or robot-assisted nephroureterectomy. A survival analysis was performed for local recurrence-free survival, distant metastasis-free survival, and overall survival. After adjusting for clinical features of the high-risk prognostic group, Cox proportional hazard model was plotted to evaluate significant predictors of time-to-event outcomes.

RESULTS

Overall, 477 patients were retrieved, of which 58 received robot-assisted distal ureterectomy and 419 robot-assisted nephroureterectomy, respectively, with a mean (±SD) follow-up of 29.6 months (±2.6). The two groups were comparable in terms of baseline features. At survival analysis, no significant difference was observed in terms of recurrence-free survival (P=0.6), metastasis-free survival (P=0.5) and overall survival (P=0.7) between robot-assisted distal ureterectomy and robot-assisted nephroureterectomy. At Cox regression analysis, type of surgery was never a significant predictor of worse oncological outcomes. At last follow-up patients undergoing robot-assisted distal ureterectomy had significantly better postoperative renal function.

CONCLUSIONS

Comparable outcomes in terms of recurrence-free survival, metastasis-free survival, and overall survival between robot-assisted distal ureterectomy and robot-assisted nephroureterectomy patients, and better postoperative renal function preservation in the former group were observed. Kidney-sparing surgery should be considered as a potential option for selected patients with high-risk distal ureteral UTUC.

Endoscopic intervention versus radical nephroureterectomy for the management of localized upper urinary tract urothelial carcinoma: a systematic review and meta-analysis of comparative studies

OBJECTIVE

Localized Upper Urinary Tract Urothelial Carcinoma (UTUC) is an uncommon cancer typically detected at an advanced stage. Currently, radical nephroureterectomy (RNU) with bladder cuff excision is the standard treatment for high-risk UTUC. This meta-analysis aims to evaluate the 5-year overall and cancer-specific survival and bladder recurrence rates in studies comparing endoscopic kidney-sparing surgeries (E-KSS) with RNU in localized UTUC.

EVIDENCE ACQUISITION

We performed a literature search on 20th April 2023 through PubMed, Web of Science, and Scopus. The PICOS model was used for study inclusion: P: adult patients with localized UTUC; I: E-KSS. C: RNU; O: primary: overall survival (OS); secondary: cancer-specific survival (CSS), bladder recurrence rate, and metastasis-free survival (MFS). S: retrospective, prospective, and randomized studies.

EVIDENCE SYNTHESIS

Overall, 11 studies involving 2284 patients were eligible for this meta-analysis, 737 in the E-KSS group and 1547 in the RNU group. E-KSS showed a similar overall 5-year OS between E-KSS and RNU, and for low-grade tumors, while 5-year OS favored RNU for high-grade tumors (RR 1.84, 95% CI 1.26-2.69, p = 0.002). No difference emerged for 5-year CSS between the two groups, even when the results were stratified for low- and high grade tumors. Bladder recurrence rate and 5-year MFS were also similar between the two groups.

CONCLUSIONS

Our review showed that E-KSS is a viable option for patients with localized UTUC with non-inferior oncological outcomes as compared with RNU, except for 5-year OS in high-grade tumors which favoured RNU.

Prognostic Impact of the Modified 5-Item Frailty Index After Radical Nephroureterectomy in Patients With Upper Tract Urothelial Carcinoma: A Multicenter Retrospective Study

INTRODUCTION

The modified 5-item frailty index can be used to evaluate frailty using 5 routinely encountered clinical variables. This study aimed to assess the impact of the modified 5-item frailty index in patients who underwent radical nephroureterectomy for upper tract urothelial carcinoma.

PATIENTS AND METHODS

In this multicenter retrospective study, we calculated the modified 5-item frailty index scores of patients who underwent radical nephroureterectomy for upper tract urothelial carcinoma between 2010 and 2022. Patients were categorized into the high (≥2) and low (≤1) modified 5-item frailty index score groups. To assess the prognostic influence of the preoperative modified 5-item frailty index, we conducted Cox proportional regression analyses concerning progression-free, overall, and cancer-specific survival.

RESULTS

Of 434 patients, 82, and 352 were classified into the high and low modified 5-item frailty index score groups, respectively. The high modified 5-item frailty index score group had significantly higher rates of severe surgical complications (P = .038) and ≥30 days of hospitalization (P = .049) and significantly worse progression-free (P = .012) and overall survival (P = .002) than the low modified 5-item frailty index score group. The multivariable Cox proportional hazard analysis revealed that a high modified 5-item frailty index score was independently associated with poor progression-free (P = .044), overall (P = .017), and cancer-specific survival (P = .005).

CONCLUSION

The modified 5-item frailty index emerged as a significant predictive indicator of severe surgical complications and postoperative survival outcomes in patients with upper tract urothelial carcinoma treated with radical nephroureterectomy.

Serum α-hydroxybutyrate dehydrogenase as a biomarker for predicting survival outcomes in patients with UTUC after radical nephroureterectomy

PURPOSE

We aimed to determine the prognostic value of α-hydroxybutyrate dehydrogenase (α-HBDH) in upper tract urothelial carcinoma (UTUC) patients after radical nephroureterectomy (RNU).

MATERIALS AND METHODS

We retrospectively enrolled the data of 544 UTUC patients at West China Hospital from May 2003 to June 2019. Cancer-specific survival (CSS) was the endpoint of interest. The optimal cutoff value of α-HBDH was identified by X-Tile program. After propensity score matching (PSM), we utilized Kaplan‒Meier curves to estimate survival and Cox proportional hazard model for risk assessment. A nomogram was built based on the results of multivariate analysis, and calibration curve, time-dependent receiver operating characteristic (ROC) curves and decision curve analysis were also performed to evaluate the predictive accuracy.

RESULTS

Overall, 394 and 150 patients were divided into the α-HBDH-low group and α-HBDH -high group at the cutoff value of 158 U/L, respectively. After PSM, the two groups were well matched for all confounding factors. High α-HBDH was associated with inferior CSS (P = 0.006), and preoperative α-HBDH was an independent predictor for CSS (HR: 1.36; 95% CI:1.08, 1.80), especially in localized UTUC patients (HR: 2.04; 95% CI:1.11, 3.74). Furthermore, the nomogram based on α-HBDH achieved great predictive ability for CSS with areas under the curves of 0.800 and 0.778 for 3-year and 5-year CSS, respectively.

CONCLUSION

Serum α-HBDH was a novel and reliable biomarker for predicting survival outcomes in UTUC patients after RNU but should be further explored.

Clinicopathological characteristics, surgical treatments, and oncological outcomes of localized primary unifocal urothelial carcinoma involving the ureterovesical junction

OBJECTIVE

To investigate clinicopathological characteristics, surgical treatments, and oncological outcomes of patients with localized primary unifocal urothelial carcinoma involving the ureterovesical junction (UC-UVJ).

PATIENTS AND METHODS

Localized primary unifocal UC-UVJ cases in patients admitted to our hospital from March 2013 to August 2021 were reviewed. Clinicopathological parameters, perioperative data, and oncological outcomes were compared between patients grouped by tumor location and surgical treatment.

RESULTS

A total of 130 patients with localized primary unifocal UC-UVJ were enrolled in this study. These included 72 cases of bladder cancer (BC) involving the ureteral orifice, and 58 cases of upper urinary tract urothelial carcinoma (UTUC) involving the intramural ureter. The proportion of male patients, hydronephrosis, flank pain/abdominal pain, and tumor size differed significantly between the BC and UTUC groups (all P < 0.05). During the median follow-up period of 32.9 months, 49 cases (37.7%) recurred and 29 (22.3%) died from urothelial carcinoma (UC), though no statistical difference in recurrence (P = 0.436) or cancer-specific mortality (P = 0.653) was observed between the BC and UTUC groups. Cox proportional hazards regression analysis identified age, tumor grade, and lymphovascular invasion (LVI) as independent predictors of cancer-specific survival (CSS), and sex, T stage, tumor grade, and LVI as independent predictors of recurrence-free survival (RFS).

CONCLUSION

Owing to positional properties, patients with localized primary unifocal UC-UVJ exhibited significant heterogeneity, leading to varied treatment strategies. No statistically significant differences in CSS or RFS were observed between the BC and UTUC groups. Furthermore, age, sex, T stage, tumor grade, and LVI should be carefully considered in clinical practice because of their associations with CSS and RFS.

Investigation of eligibility for adjuvant therapy from real-world data of patients with urothelial carcinoma undergoing radical cystectomy and radical nephroureterectomy

OBJECTIVE

Adjuvant nivolumab prolonged disease-free survival compared with placebo in patients at high risk of recurrence following radical cystectomy or radical nephroureterectomy in the CheckMate 274 trial. However, the ideal eligibility criteria for adjuvant therapy in real-world clinical practice remain controversial.

METHODS

We retrospectively analyzed clinical data of 409 patients who underwent radical cystectomy (n = 252) or radical nephroureterectomy (n = 157) and validated the risk of recurrence based on the classification used in the CheckMate 274 trial. We also investigated the impact of perioperative chemotherapy, lymph node dissection and pathological factors on prognosis.

RESULTS

The median follow-up time was 37.5 and 32.1 months in bladder cancer and upper tract urothelial carcinoma, respectively. Among the high-risk patients based on CheckMate 274 trial, disease-free survival was considerably shorter for bladder cancer and upper tract urothelial carcinoma patients than for low-risk patients (hazard ratios: 4.132 and 7.101, respectively). The prevalence of adjuvant chemotherapy in high-risk patients was low (24 and 38% for bladder cancer and upper tract urothelial carcinoma, respectively). The extent of lymph node dissection in bladder cancer and presence of lymph node dissection in upper tract urothelial carcinoma did not affect prognosis. Cox proportional multivariate analysis revealed CheckMate 274-high-risk as a poor prognostic factor in bladder cancer and upper tract urothelial carcinoma.

CONCLUSIONS

This study validated the risk classification for recurrence following radical cystectomy and radical nephroureterectomy using the CheckMate 274 criteria in real-world practice. Further research would help assess the degree of benefit obtained from adjuvant nivolumab.

A systematic review and meta-analysis for human epidermal growth factor receptor 2 on upper tract urothelial carcinoma patients

OBJECTIVE

The expression and significance of human epidermal growth factor receptor 2 (Her2) in upper tract urothelial carcinoma (UTUC) remains controversial. Thus, we aimed to systemically review the Her2 expression in UTUC patients and its relationship with pathological characters and clinical outcomes with meta-analysis.

MATERIALS AND METHODS

A systematically computerized search in PubMed, Scopus, Embase and Cochrane was conducted. From a total of 454 related articles, 35 articles were finally reviewed and 16 papers were chosen for further analysis. Pathological characters included tumor stage, grade, lymph node metastasis (LNM) and lymphovascular invasion (LVI). The clinical outcomes included overall survival (OS), recurrence-free survival (RFS), cancer specific survival (CSS), metastatic-free survival (MFS) and progression-free survival (PFS). RevMan software was used for meta-analyses.

RESULTS

In total 16 studies from 1994 to 2020 were chosen, 14 studies used immunohistochemistry to assess the expression of Her2 and 5 studies used in situ hybridization, with a positive rate of 0 to 74.0% and 7.2 to 18.1%, respectively. Her2-positive was significantly associated with stage (pooled HR 1.86; 95 % CI 1.43-2.42), grade (pooled HR 2.81; 95 % CI 1.01-7.85) and LNM (pooled HR 1.93; 95 % CI 1.18-3.15). However, there was no statistically relationship between Her2-positive with LVI (pooled HR 1.48; 95 % CI 0.64-3.46) and RFS (pooled HR 1.41; 95 % CI 0.98-1.83).

CONCLUSIONS

This review indicated that UTUC patients with Her2-positive tended to develop higher stage and grade tumors and LNM. The Her2 expression in UTUC patients deserves further investigation in the future.

Oncologic surveillance intensity after endoscopic treatment of upper tract urothelial carcinoma

BACKGROUND

The optimal oncologic surveillance in patients with upper tract urothelial carcinoma (UTUC) elected for conservative treatment is still a matter of debate.

METHODS

Patients elected for endoscopic treatment of UTUC were followed up according to EAU guidelines recommendations after treatment. Bladder cancer recurrence-free survival (BCa-RFS), UTUC recurrence-free survival (UTUC-RFS), radical nephroureterectomy-free survival (RNU-FS), and cancer-specific survival (CSS) were estimated using the Kaplan-Meier method. The crude risks of BCa and UTUC recurrences over time were estimated with the Locally Weighted Scatterplot Smoothing method.

RESULTS

Overall, 54 and 55 patients had low- and high-risk diseases, respectively. Median follow-up was 46.9 (IQR: 28.7-68.7) and 36.9 (IQR: 19.8-60.1) months in low and high-risk patients, respectively. In low-risk patients, BCa recurrence risk was more than 20% at 24 months follow-up. At 60 months, time point after which cystoscopy and imaging should be interrupted, the risk of BCa recurrence and UTUC recurrence were 14% and 7%, respectively. In high-risk patients, the risk of BCa and UTUC recurrence at 36 months was approximately 40% and 10%, respectively. Conversely, at 60 months, the risk of bladder recurrence and UTUC recurrence was 28% and 8%, respectively.

CONCLUSIONS

For low-risk patients, cystoscopy should be performed semi-annually until 24 months, while upper tract assessment should be obtained up to 60 months, as per current EAU guidelines recommendations. For high-risk patients, upper tract assessment should be intensified to semi-annually up to 36 months, then obtained yearly. Conversely, cystoscopy should be ideally performed semi-annually until 60 months and yearly thereafter.

Sequential endoluminal gemcitabine and docetaxel for the treatment of clinically non-invasive high-grade upper tract urothelial carcinoma

PURPOSE

There is an unmet need for effective renal sparing treatments for upper tract urothelial carcinoma (UTUC). Gemcitabine/Docetaxel (Gem/Doce) has shown favorable efficacy in nonmuscle invasive bladder cancer. We report the outcomes of patients treated with endoluminal Gem/Doce for noninvasive high-grade UTUC.

METHODS

A retrospective review of patients treated with Gem/Doce for clinically noninvasive high-grade UTUC with no radiographic or endoscopically visible disease, either at diagnosis or following ablation, was performed. Treatment was instilled via nephrostomy or retrograde ureteral catheter. Induction instillations were performed weekly for 6 weeks, followed by 6 monthly instillations if disease-free. Recurrence was defined as biopsy-proven disease or high-grade (HG) cytology. Progression was defined by development of muscle invasion, metastases, or death due to cancer. Survival was assessed with the Kaplan-Meier method.

RESULTS

The final cohort included 31 patients with 41 upper tract units, 51% of which would have been dialysis dependent with nephroureterectomy. Median (IQR) age was 74 years (68-81). Median follow-up was 29 months (IQR 20-58). Prior to treatment, 37 (90%) units presented with a localizing HG cytology (presumed occult CIS), and 4 (9.8%) with HG biopsy-proven disease. Sixteen (52%) patients reported any side effects; 5 were Grade 3 and 1 was Grade 5. Recurrence-free survival was 76%, 54%, and 40% at 1, 2, and 3 years, respectively. Five patients died from urothelial carcinoma. The 3-year progression-free and overall survival were 75% and 75%, respectively.

CONCLUSIONS

Gem/Doce demonstrates promising safety and efficacy as a renal-sparing treatment option for high-grade UTUC in appropriately selected patients.

Oncologic outcomes of patients treated with kidney-sparing surgery or radical nephroureterectomy for upper urinary tract urothelial cancer: a population-based study

PURPOSE

Although kidney-sparing surgery (KSS) is a nonminor option for low-risk upper urinary tract urothelial cancer (UTUC), its oncological benefits in high-risk UTUC remain unclear when compared to radical nephroureterectomy (RNU). This study aimed to compare the oncological outcomes of RNU and KSS in patients with UTUC.

METHODS

We searched the SEER database for patients treated for primary non-metastatic UTUC with either RNU or a kidney-sparing approach (segmental ureterectomy (SU) or local tumor excision (LTE)) between 2004 and 2018.

RESULTS

The study included 6,659 patients with primary non-metastatic UTUC treated with surgery; 2,888 (43.4%) and 3,771 (56.6%) patients presented with ureteral and renal pelvicalyceal tumors, respectively. Finally, 5,479 (82.3%) patients underwent RNU, 799 (12.0%) were treated with SU, and 381 (5.7%) patients received LTE. For confounder control, propensity score matching (PSM) of patients treated with SU and RNU was performed to adjust for T stage, grade, age, gender, tumor size, and lymphadenectomy performance. PSM analysis included 694 patients treated with RNU and 694 individuals who underwent SU. In multivariable Cox regression and Kaplan-Meier analyses, we found no difference in either CSS or OS between RNU and SU, even in the subgroup of high-grade and/or muscle-invasive UTUC including pT3-T4 tumors (all p > 0.05).

CONCLUSION

In this population-based study, SU provides equivalent CSS and OS compared to RNU, even in high-risk and locally advanced ureteral cancer. Due to the unavoidable risk of selection bias, further prospective studies are expected to overcome the limitations of this study and support the wider implementation of KSS.

Effect of subsequent bladder cancer on survival in upper tract urothelial carcinoma patients post-radical nephroureterectomy: a systematic review and meta-analysis

BACKGROUND

Radical nephroureterectomy (RNU) is the primary treatment strategy for upper tract urothelial carcinoma (UTUC). However, the intravesical recurrence occurs in 20-50% of all patients. The specific effect of subsequent bladder cancer (SBCa) on survival remains unclear. Therefore, we investigated the effect of SBCa following RNU in patients with UTUC.

METHODS

PubMed, EMBASE, and Cochrane Library were exhaustively searched for studies comparing oncological outcomes between SBCa and without SBCa. Standard cumulative analyses using hazard ratios (HR) with 95% confidence intervals (CI) were performed using Review Manager (version 5.3).

RESULTS

Five studies involving 2057 patients were selected according to the predefined eligibility criteria. Meta-analysis of cancer-specific survival (CSS) and overall survival (OS) revealed no significant differences between the SBCa and non-SBCa groups. However, subgroup analysis of pT0-3N0M0 patients suggested that people with SBCa had worse CSS (HR = 5.13, 95%CI 2.39-10.98, p < 0.0001) and OS (HR = 4.00, 95%CI 2.19-7.31, p < 0.00001).

CONCLUSIONS

SBCa appears to be associated with worse OS in patients with early stage UTUC. However, caution must be taken before recommendations are made because this interpretation is based on very few clinical studies and a small sample size. Research sharing more detailed surgical site descriptions, as well as enhanced outcome data collection and improved reporting, is required to further investigate these nuances.

Upper Tract Urothelial Carcinoma: A Narrative Review of Current Surveillance Strategies for Non-Metastatic Disease

Non-metastatic upper urinary tract carcinoma (UTUC) is a comparatively rare condition, typically managed with either kidney-sparing surgery (KSS) or radical nephroureterectomy (RNU). Irrespective of the chosen therapeutic modality, patients with UTUC remain at risk of recurrence in the bladder; in patients treated with KSS, the risk of recurrence is high in the remnant ipsilateral upper tract system but there is a low but existent risk in the contralateral system as well as in the chest and in the abdomen/pelvis. For patients treated with RNU for high-risk UTUC, the risk of recurrence in the chest, abdomen, and pelvis, as well as the contralateral UT, depends on the tumor stage, grade, and nodal status. Hence, implementing a risk-stratified, location-specific follow-up is indicated to ensure timely detection of cancer recurrence. However, there are no data on the type and frequency/schedule of follow-up or on the impact of the recurrence type and site on outcomes; indeed, it is not well known whether imaging-detected asymptomatic recurrences confer a better outcome than recurrences detected due to symptoms/signs. Novel imaging techniques and more precise risk stratification methods based on time-dependent probabilistic events hold significant promise for making a cost-efficient individualized, patient-centered, outcomes-oriented follow-up strategy possible. We show and discuss the follow-up protocols of the major urologic societies.

Endoscopic excision versus radical nephroureterectomy for non-muscle invasive upper tract urothelial carcinoma: A population-based large cohort study

Background

As an important kidney-sparing treatment for upper urothelial carcinoma (UTUC), whether endoscopic excision can be performed without sacrificing oncologic outcomes remains indefinite. This study aimed to investigate the prevalence and efficacy of endoscopic excision, in patients with non-muscle invasive UTUC (NMIUTUC) and compare them to those of radical nephroureterectomy (RNU).

Methods

Using the Surveillance, Epidemiology, and End Results database, we reviewed 4347 cases with NMIUTUC (cTis/Ta/T1-N0-M0,≤ 5.0 cm) between 2004 and 2020. Surgical treatment modalities included endoscopic excision and RNU. Propensity score matching analysis was used to minimize the selection bias between endoscopic excision and RNU, selecting 1:1 matched patients in the two group.

Results

A total of 794 patients with NMIUTUC were included after matching (397:397). Patients who underwent endoscopic excision had worse survival outcomes compared with those of patients who underwent RNU (5-year OS: 65.3 % vs. 80.3 %, p < 0.0001; 5-year DSS: 83.2 % vs. 94.0 %, p = 0.00021). After stratification by anatomical sites, the effect of endoscopic excision for NMI renal pelvis cancer was worse than RNU (5-year OS, 62.9 % vs. 82.8 %; 5-year DSS, 78.8 % vs. 91.6 %), while in NMI ureteral cancer, there is no statistically significant difference in OS and DSS between endoscopic excision and RNU. Further stratification according to tumor grade revealed equivalent tumor control effects of endoscopic excision and RNU in low-grade NMI ureteral cancer (5-year OS: 67.7 % vs. 72.5 %, p = 0.23; 5-year DSS: 87.2 % vs. 93.1 %, p = 0.17); while for renal pelvis tumor and high-grade ureteral tumor, endoscopic excision was related with significantly inferior prognosis.

Conclusions

Only for low-grade NMI ureteral cancer, endoscopic excision and RNU are oncologically equivalent, indicating that endoscopic excision might be an effective option for low-grade NMI ureteral cancer. This result needs to be further verified in randomized controlled trials.

Nephron-sparing ureteroscopic surgery vs. radical nephroureterectomy: comparable survival-outcomes in upper tract urothelial carcinoma

PURPOSE

This study investigates the utility of ureteroscopic surgery (URS) as an alternative to radical nephroureterectomy (RNU) in managing upper tract urothelial carcinoma (UTUC), with a focus on survival outcomes and re-evaluation of current the European Association of Urology guidelines criteria.

METHODS

We conducted a retrospective, multi-institutional review of 143 UTUC patients treated with URS (n = 35) or RNU (n = 108). Clinicopathological factors were analyzed, and survival outcomes were assessed using Kaplan-Meier analysis and Cox proportional-hazards models.

RESULTS

The median follow-up period was 27 months. Overall survival (OS) and radiographic progression-free survival (rPFS) were comparable between the URS and RNU groups (OS: HR 2.42, 95% CI 0.63-9.28, P = 0.0579; rPFS: HR 1.82, 95% CI 0.60-5.47, P = 0.1641). URS conferred superior renal function preservation. In patients characterized by factors such as radiographically invisible lesions, negative cytology, pTa stage, low-grade tumors, and multiple lesions, the OS outcomes with URS were comparable to those with RNU as follows: radiographically invisible lesions (P = 0.5768), negative cytology (P = 0.7626), pTa stage (P = 0.6694), low-grade tumors (P = 0.9870), and multiple lesions (P = 0.8586).

CONCLUSION

URS offers survival outcomes similar to RNU, along with better renal function preservation, especially in low-risk UTUC patients. These findings underscore the urgency of re-evaluating the current EAU guidelines and encourage further research into determining the ideal patient selection for URS in UTUC treatment.

Positioning the role of urine cytology within the diagnostic pathway for UTUC: supportive but inconclusive

PURPOSE

With the introduction of kidney-sparing surgery (KSS) for low-risk Upper Tract Urothelial Carcinoma (UTUC), correct risk-stratification has become crucial. High-grade cytology is one of the decisive variables to stratify a tumor as high-risk. To position the role of urine cytology in the diagnostic pathway of UTUC patients, we evaluated the accuracy of urine cytology by comparing the outcomes with histopathology.

METHOD

Patients with UTUC evaluated between 2010 and 2020, and diagnosed by imaging, cytology and histopathology were selected. Descriptive statistics were used to compare cytology with histopathological outcomes using crosstabs. Clinical performance characteristics of cytology were determined for the presence of a malignancy.

RESULTS

This study included 176 patients with confirmed histopathological UTUC. Concordance between cytology and biopsy results was found in 14.8% of low-grade tumors and 16.8% of high-grade tumors. Comparing cytology with radical nephroureterectomy (RNU) specimens revealed concordance rates of 1.6% for low-grade tumors and 22.9% for high-grade tumors. Notably, 51.1% of urine cytology results were false negative. Sensitivity for detecting high-grade and low-grade tumors with a positive urine cytology was 56.6% and 52.6%, respectively, with specificities of 54.8% and 37.2%.

CONCLUSION

In the current study, cytology appears to exhibit limited reliability when used as a sole diagnostic tool for assessing tumor grade and consequently risk stratification. It is imperative to recognize these limitations, optimize urine sampling techniques, and leverage a combination of diverse diagnostic methods for the most effective and individualized treatment decision-making.

Lymph Node Dissection in Upper Tract Urothelial Carcinoma: Current Status and Future Perspectives

PURPOSE OF REVIEW

This narrative review aims to evaluate the role of lymph node dissection (LND) in upper tract urothelial carcinoma (UTUC) and its implications for staging and management outcomes, as well as future perspectives.

RECENT FINDINGS

Multiple studies have demonstrated the limitations of conventional imaging techniques in accurately localizing lymph node metastasis (LNM) in UTUC. While 18F-fluorodeoxyglucose positron emission tomography with computed tomography (18FDG-PET/CT) shows promise for preoperative LNM detection, its specificity is low. Alternative methods such as choline PET/CT and sentinel lymph node detection are under consideration but require further investigation. Additionally, various preoperative factors associated with LNM hold potential for predicting nodal involvement, thereby improving nodal staging and oncologic outcomes of LND. Several surgical approaches, including segmental ureterectomy and robot-assisted nephroureterectomy, provide a possibility for LND, while minimizing morbidity. LND remains the primary nodal staging tool for UTUC, but its therapeutic benefit is still uncertain. Advances in imaging techniques and preoperative risk assessment show promise in improving LNM detection. Further research and multi-center studies are needed to comprehensively assess the advantages and limitations of LND in UTUC, as well as the long-term outcomes of alternative staging and treatment strategies.

Kidney sparing surgery in upper tract urothelial carcinoma: paradigm change in surgical treatment for ureter cancer

PURPOSE

To extend the indications of kidney-sparing surgery (KSS) for ureter cancer by comparing the oncological outcomes between patients with upper tract urothelial carcinoma (UTUC) who underwent radical nephroureterectomy (RNU) or KSS.

METHODS

We retrospectively reviewed 708 patients with UTUC who underwent RNU (N = 646) or KSS (N = 62) between 2011 and 2019 to analyze the oncologic outcomes and prognostic factors. Subgroup analyses were performed for patients with unifocal ureteral urothelial carcinoma (UC).

RESULTS

No significant difference was observed in the overall survival (OS) or cancer-specific survival (CSS) between RNU and KSS (distal ureterectomy with reimplantation (N = 33), ureterectomy with ileal ureter (N = 14), ureteroscopic tumor resection (N = 10), and ureterectomy with ureteroureterostomy (N = 5)). Among 269 (38.0%) patients with unifocal ureteral UC, 219 and 50 patients underwent RNU and KSS, respectively. OS and CSS were not significantly different between these two groups. Pathologic stage was a significant risk factor in multivariate analysis (hazard ratio = 2.621; p = 0.000). Among 646 RNU patients, 219 (33.9%) had unifocal ureteral UC, 40 (18.3%) with low-grade tumors. Among these, 13 (5.9%) patients with unifocal, low-grade and small (< 2 cm) tumors received nephroureterectomy.

CONCLUSION

Kidney-sparing surgery should be regarded as an important alternative to RNU for patients with unifocal ureteral UC thought to have noninvasive disease to preserve renal function and reduce overtreatment.

The long-term outcome of nephron-sparing surgery versus radical nephroureterectomy for organ-localized upper urinary tract urothelial carcinoma: a population-based study of 1969 patients

PURPOSE

To compare the long-term outcomes after nephron-sparing surgery (NSS) and radical nephroureterectomy (RNU) and investigate prognostic factors for organ-localized upper urinary tract urothelial carcinoma (UTUC) as the role of NSS for UTUC remains unclear.

METHODS

Patients diagnosed with organ-localized UTUC between 2004 and 2020 were identified from the Surveillance, Epidemiology, and End Results (SEER) database. The propensity score overlap weighting (PSOW) process, Cox regression analysis, Kaplan‒Meier analysis, competing-risks models, and subgroup analysis were employed to compare the outcomes and identify prognostic factors. The overall survival (OS) and cancer-specific survival (CSS) nomograms were developed and evaluated using the concordance index (C-index) and calibration curve.

RESULTS

A total of 1969 patients were included. After the process of PSOW, baseline data were well balanced. RNU was associated with similar OS and CSS than NSS in the overall cohort. Age, T stage, and histologic grade were independent prognostic factors for OS and CSS, while marital status was an independent prognostic factor only for OS. Four and three predictors were identified for developing the OS and CSS nomograms, respectively. C-index (OS 0.637, CSS 0.670), calibration curve, and Kaplan-Meier analysis proved excellent predictive accuracy of nomograms.

CONCLUSION

Patients accepting RNU had a comparative or better outcome in each sample group. NSS achieved a similar oncologic control for selected patients with organ-localized UTUC.

Route of Administration for UGN-101 and Impact on Oncological and Safety Outcomes

BACKGROUND

UGN-101 can be used for chemoablation of low-grade upper tract urothelial carcinoma (UTUC). The gel can be administered via a retrograde route through a ureteral catheter or an antegrade route via a nephrostomy tube.

OBJECTIVE

To report outcomes of UGN-101 by route of administration.

DESIGN, SETTING, AND PARTICIPANTS

We performed a retrospective review of 132 patients from 15 institutions who were treated with UGN-101 for low-grade UTUC via retrograde versus antegrade administration.

OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS

Survival outcomes are reported per patient. Treatment, complications, and recurrence outcomes are reported per renal unit. Statistical analysis was performed for primary endpoints of oncological response and ureteral stricture occurrence.

RESULTS AND LIMITATIONS

A total of 136 renal units were evaluated, comprising 78 retrograde and 58 antegrade instillations. Median follow-up was 7.4 mo. There were 120 cases (91%) of biopsy-proven low-grade UTUC. Tumors were in the renal pelvis alone in 89 cases (65%), in the ureter alone in 12 cases (9%), and in both in 35 cases (26%). Seventy-six patients (56%) had residual disease before UGN-101 treatment. Chemoablation with UGN-101 was used in 50/78 (64%) retrograde cases and 26/58 (45%) antegrade cases. A complete response according to inspection and cytology was achieved in 31 (48%) retrograde and 30 (60%) antegrade renal units (p = 0.1). Clavien grade 3 ureteral stricture occurred in 21 retrograde cases (32%) and only six (12%) antegrade cases (p < 0.01). Limitations include treatment bias, as patients in the antegrade group were more likely to undergo endoscopic mechanical ablation before UGN-101 instillation.

CONCLUSIONS

These preliminary results show a significantly lower rate of stricture occurrence with antegrade administration of UGN-101, with no apparent impact on oncological efficacy.

PATIENT SUMMARY

We compared results for two different delivery routes for the drug UGN-101 for treatment of cancer in the upper urinary tract. For the antegrade route, a tube is inserted through the skin into the kidney. For the retrograde route, a catheter is inserted past the bladder into the upper urinary tract. Our results show a lower rate of narrowing of the ureter (the tube draining urine from the kidney into the bladder) using the antegrade route, with no difference in cancer control.

FAM111B Acts as an Oncogene in Bladder Cancer

Bladder cancer (BLCA) is a prevalent malignancy of the urinary system, associated with a high recurrence rate and poor prognosis. FAM111B, which encodes a protein containing a trypsin-like cysteine/serine peptidase domain, has been implicated in the progression of various human cancers; however, its involvement in BLCA remains unclear. In this study, we investigated the expression of FAM111B gene in tumor tissues compared to para-tumor tissues using immunohistochemistry and observed a significantly higher FAM111B gene expression in tumor tissues. Furthermore, analysis of clinical characteristics indicated that the increased FAM111B gene expression correlated with lymphatic metastasis and reduced overall survival. To investigate its functional role, we employed FAM111B-knockdown BLCA cell models and performed cell proliferation, wound-healing, transwell, and flow cytometry assays. The results showed that decreased FAM111B gene expression inhibited proliferation and migration but induced apoptosis in BLCA cells. In vivo experiments further validated that FAM111B knockdown suppressed tumor growth. Overall, our findings suggest that FAM111B acts as an oncogene in BLCA, playing a critical role in tumorigenesis, progression, and metastasis of BLCA. In conclusion, we have demonstrated a strong correlation between the expression of FAM111B gene and the development, progression, and metastasis of bladder cancer (BLCA). Thus, FAM111B is an oncogene associated with BLCA and holds promise as a molecular target for future treatment of this cancer.

Intravesical Therapy for Upper Urinary Tract Urothelial Carcinoma: A Comprehensive Review

Upper tract urothelial carcinoma (UTUC) poses unique challenges in diagnosis and treatment. This comprehensive review focuses on prophylactic intravesical therapy for UTUC, summarizing key aspects of intravesical therapy in various clinical scenarios, including concurrent with or following radical nephroureterectomy, kidney-sparing surgery, ureteroscopy-guided biopsy. The incidence of intravesical recurrence in UTUC after surgical treatment is significant, necessitating effective preventive measures. Intravesical therapy plays a vital role in reducing the risk of bladder recurrence following UTUC surgery. Tailoring timing, drug selection, dosage, and frequency is vital in optimizing treatment outcomes and reducing intravesical recurrence risk in UTUC. This review provides a comprehensive summary of the history, clinical trials, guideline recommendations, and clinical applications of intravesical therapy for UTUC. It also discusses the future directions based on current clinical needs and ongoing trials. Future directions entail optimizing dosage, treatment duration, and drug selection, as well as exploring novel agents and combination therapies. Intravesical therapy holds tremendous potential in improving outcomes for UTUC patients and reducing the risk of bladder recurrence. Although advancements have been made in UTUC treatment research, further refinements are necessary to enhance efficacy and safety.

The importance of second-look ureteroscopy implementation in the conservative management of upper tract urothelial carcinoma

PURPOSE

The purpose of the study was to evaluate the effect of second-look ureteroscopy (SU) in the endoscopic operative work-up of patients with upper tract urothelial carcinoma (UTUC).

MATERIALS AND METHODS

Patients with UTUC who underwent SU between 2016 and 2021 were included. Cancer detection rate (CDR) at SU was defined as endoscopic visualization of tumor. The effect of SU on recurrence-free survival (RFS), radical nephroureterectomy-free survival (RNU-FS), bladder cancer-free survival (BC-FS), and cancer-specific survival (CSS) was estimated using the Kaplan-Meier method. Multivariate logistic regression analysis (MLR) assessed predictors of negative SU. Finally, we evaluated the effect of SU timing on oncological outcomes, classifying SUs as "early" (≤ 8 weeks) and "late" (> 8 weeks).

RESULTS

Overall, 85 patients underwent SU. The CDR at SU was 44.7%. After a median follow-up was 35 (IQR: 15-56) months, patients with positive SU had a higher rate of UTUC recurrence (47.4% vs 19.1%, p = 0.01) and were more frequently radically treated (34.2% vs 8.5%, p = 0.007). Patients with high-grade disease (hazard ratio [HR]: 3.14, 95% CI 1.18-8.31; p = 0.02) had a higher risk of UTUC recurrence, while high-grade tumor (HR: 3.87, 95%CI 1.08-13.77; p = 0.04) and positive SU (HR: 4.56, 95%CI 1.05-22.81; p = 0.04) were both predictors of RNU. Low-grade tumors [odds ratio (OR): 5.26, 95%CI 1.81-17.07, p = 0.003] and tumor dimension < 20 mm (OR: 5.69, 95%CI 1.48-28.31, p = 0.01) were predictors of negative SU. Finally, no significant difference emerged regarding UTUC recurrence, RNU, BC-FS, and CSM between early vs. late SUs (all p > 0.05).

CONCLUSIONS

SU may help in identifying patients with UTUC experiencing an early recurrence after conservative treatment. Patients with low-grade and small tumors are those in which SU could be safely postponed after 8 weeks.

Minimally Invasive Radical Nephroureterectomy: 5-Year Update of Techniques and Outcomes

The gold standard treatment for non-metastatic upper tract urothelial cancer (UTUC) is represented by radical nephroureterectomy (RNU). The choice of surgical technique in performing UTUC surgery continues to depend on several factors, including the location and extent of the tumor, the patient's overall health, and very importantly, the surgeon's skill, experience, and preference. Although open and laparoscopic approaches are well-established treatments, evidence regarding robot-assisted radical nephroureterectomy (RANU) is growing. Aim of our study was to perform a critical review on the evidence of the last 5 years regarding surgical techniques and outcomes of minimally invasive RNU, mostly focusing on RANU. Reported oncological and function outcomes suggest that minimally invasive RNU is safe and effective, showing similar survival rates compared to the open approach.

Modern Kidney-Sparing Management of Upper Tract Urothelial Carcinoma

PURPOSE

To review the latest evidence on the modern techniques and outcomes of kidney-sparing surgeries (KSS) in patients with upper tract urothelial carcinoma (UTUC).

METHODS

A comprehensive literature search on the study topic was conducted before 30 April 2023 using electronic databases including PubMed, MEDLINE, and EMBASE. A narrative overview of the literature was then provided based on the extracted data and a qualitative synthesis of the findings.

RESULTS

KSS is recommended for low- as well as select high-risk UTUCs who are not eligible for radical treatments. Endoscopic ablation is a KSS option that is associated with similar oncological outcomes compared with radical treatments while preserving renal function in well-selected patients. The other option in this setting is distal ureterectomy, which has the advantage of providing a definitive pathological stage and grade. Data from retrospective studies support the superiority of this approach over radical treatment with similar oncological outcomes, albeit in select cases. Novel chemoablation agents have also been studied in the past few years, of which mitomycin gel has received FDA approval for use in low-risk UTUCs.

CONCLUSION

KSSs are acceptable approaches for patients with low- and select high-risk UTUCs, which preserve renal function without compromising the oncological outcomes.

The ablative effect of mitomycin reverse thermal gel: Expanding the role for nephron preservation therapy in low grade upper tract urothelial carcinoma

PURPOSE

Assess the real-world ablative effect of mitomycin reverse thermal gel for low-grade upper tract urothelial carcinoma (UTUC) in patients who undergo biopsy only or partial ablation and evaluate utility of complete ablation prior to UGN-101.

MATERIAL AND METHODS

We retrospectively reviewed low-grade UTUC patients treated with UGN-101 from 15 high-volume centers. Patients were categorized based on initial endoscopic ablation (biopsy only, partial ablation, or complete ablation) and by size of remaining tumor (complete ablation, <1cm, 1-3cm, or >3cm) prior to UGN-101. The primary outcome was rendered disease free (RDF) rate at first post-UGN-101 ureteroscopy (URS), defined as complete response or partial response with minimal mechanical ablation to endoscopically clear the upper tract of visible disease.

RESULTS

One hundred and sixteen patients were included for analysis after excluding those with high-grade disease. At first post-UGN-101 URS, there were no differences in RDF rates between those who at initial URS (pre-UGN-101) had complete ablation (RDF 77.0%), partial ablation (RDF 55.9%) or biopsy only (RDF 66.7%) (P = 0.14). Similarly, a complimentary analysis focusing on tumor size (completely ablated, <1cm, 1-3cm or >3cm) prior to UGN-101 induction did not demonstrate significant differences in RDF rates (P = 0.17).

CONCLUSION

The results of the early real-world experience suggest that UGN-101 may play a role in initial chemo-ablative cytoreduction of larger volume low-grade tumors that may not initially appear to be amenable to renal preservation. Further studies will help to better quantify the chemo-ablative effect and to identify clinical factors for patient selection.

Learning from the past and present to change the future: Endoscopic management of upper urinary tract urothelial carcinoma

Current guidelines recommend endoscopic management (EM) for patients with low-risk upper urinary tract urothelial carcinoma, as well as those with an imperative indication. However, regardless of the tumor risk, radical nephroureterectomy is still mainly performed worldwide despite the benefits of EM, such as renal function maintenance, no hemodialysis requirement, and treatment cost reduction. This might be explained by the association of EM with a high risk of local recurrence and progression. Furthermore, the need for rigorous patient selection and close surveillance following EM may be relevant. Nevertheless, recent developments in diagnostic modalities, pathological evaluation, surgical devices and techniques, and intracavitary regimens have been reported, which may contribute to improved risk stratification and treatments with superior oncological outcomes. In this review, considering recent advances in endourology and oncology, we propose novel treatment strategies for optimal EM.

Evaluation of the diagnostic efficiency of voided urine fluorescence in situ hybridization for predicting the pathology of preoperative "low-risk" upper tract urothelial carcinoma

Objectives

To evaluate the clinical utility of voided urine fluorescence in situ hybridization (FISH) for predicting the pathology of preoperative "low-risk" upper tract urothelial carcinoma (UTUC).

Methods

Information of patients preoperatively diagnosed with "low-risk" UTUC receiving radical nephroureterectomy (RNU) between May 2014 and October 2019 were retrospectively collected. All of the patients accepted the FISH test and then were divided into two groups according to the results of FISH. The diagnostic value of FISH was assessed through the receiver operating characteristics (ROC) curve and area under the curve. Logistic regression analysis was applied to examine FISH as a predictive factor of tumor final stage and grade of preoperative "low-risk" UTUC.

Results

In total, 129 patients were included. Of them, 70 (54.2%) were marked with positive FISH result. The difference at final pathology in tumor stage and tumor grade between these two groups of FISH (-) and FISH (+) had significantly statistical significance (p<0.001). Regarding to the tumor stage at final pathology, the sensitivity, specificity, positive predictive value and negative predictive value of FISH were 70.7 (58.9-80.3)68.5 (54.3-80.1)75.7 (63.7-84.8) and 62.7 (49.1-74.7), respectively. Regarding to the tumor grade at final pathology, the sensitivity, specificity, positive predictive value and negative predictive value of FISH were 64.7 (53.5-74.6), 65.9 (50.0-79.1), 78.6 (66.8-87.1) and 49.1 (36.5-62.3), respectively. The results of logistic regression analysis indicated that FISH could predict the pathologic characteristics of preoperative "low-risk" UTUC independently.

Conclusions

FISH was qualified with relatively high diagnostic estimates for predicting tumor stage and grade of preoperative "low-risk" UTUC, and could be an independent predictive factor in clinical practice. For preoperative "low-risk" UTUC patients but with positive FISH result, choosing nephron-sparing surgery may require special caution.

Endoscopic Conservative Treatment of Upper Urinary Tract Urothelial Carcinoma with a Thulium Laser: A Systematic Review

INTRODUCTION

Thulium lasers (TLs), namely the Thulium fiber laser (TFL) and the Thulium:YAG (Tm:YAG), are being increasingly adopted for the conservative treatment of upper urinary tract urothelial carcinoma (UTUC). However, to date, the real clinical impact of TLs on UTUC management remains not well-characterized. We performed a review of the literature to summarize the current evidence on TLs for UTUC treatment.

MATERIALS AND METHODS

We performed a systematic review in January 2023 using the Embase and Medline online databases, according to the PRISMA recommendations and using the PICO criteria. Outcomes of interest were: (i) to assess the safety and feasibility of TLs in the treatment of UTUC, and (ii) to evaluate the oncological outcomes in terms of tumor recurrence and conservative treatment failure. Moreover, we described TL characteristics and its interaction with soft tissue.

RESULTS

a total of 458 articles were screened, and six full texts including 273 patients were identified. All the included studies were retrospective series. Mean patient age ranged from 66 to 73 years. The indication of a conservative treatment was elective and imperative in 21.7-85% and 15-76% of cases, respectively. Laser power settings varied from 5 to 50 W. No intraoperative complications were reported, and all the procedures were successfully performed. The tumor recurrence rate was 17.7-44%, and the indication to radical nephroureterectomy was 3.7-44% during a follow-up of 6-50 months. Most of the postoperative complications were mild and transient, and ureteral strictures were reported in two studies. Major limitations were the retrospective nature of the studies, the small sample sizes, and the short follow-up.

CONCLUSIONS

TL is an effective and safe technology for endoscopic UTUC treatment. However, current available literature lacks prospective and multicentric studies with large population sizes and long-term follow-up.

Small bowel obstruction secondary to metastatic urothelial bladder cancer

Small bowel obstruction secondary to primary cancer, such as carcinoid and adenocarcinoma, is not unusual. Less frequently, hematological metastasis from breast, lung, and melanoma can occur. However, metastasis from urothelial bladder carcinoma is extremely rare. In this index case, we describe a 71-year-old Caucasian man with a prior history of urothelial bladder carcinoma. He was treated successfully with chemoradiation and local resection a year prior to his current presentation with small bowel obstruction which required surgical resection of a loop of jejunum, which was found to be caused by obstructive, metastatic urothelial bladder carcinoma on pathology. Therefore, one should consider the possibility of secondary obstructive malignant lesions arising from the urinary bladder in such a patient when presented with bowel obstruction and a history of urothelial bladder carcinoma.

Endophytic upper tract urothelial carcinoma in a solitary kidney treated by cryotherapy: an unorthodox case for successful management

BACKGROUND

Nephroureterectomy remains the gold standard treatment for upper tract urothelial carcinoma (UTUC). Considering the high risk of developing renal function impairment after surgery, the rationale for nephron sparing approaches in treatment of UTUC has been raised. In this case, renal cryoablation was able to achieve successful oncologic control while preserving renal function during 5 years of follow up without intraoperative or post operative complications.

CASE PRESENTATION

A 79 year old male presents after three months of macroscopic hematuria. Imaging revealed a 3.6 × 3.1 × 2.7 cm endophytic mass in the interpolar region of the left kidney and an atrophic right kidney. After weighing the lesion's location with the patient's of complex medical history, he was counselled to undergo a minimally invasive percutaneous cryoablation as treatment for his solitary renal mass. A diagnostic dilemma was encountered as imaging suggested a diagnosis of renal cell carcinoma. However, the pre-ablation biopsy established an alternative diagnosis, revealing UTUC. Percutaneous cryoablation became an unorthodox treatment modality for the endophytic component of his UTUC followed by retrograde ureteroscopic laser fulguration. The patient was followed in 3 months, 6 months, then annually with cross sectional imaging by MRI, cystoscopy, urine cytology and renal function testing. After five years of follow-up, the patient did not encountered recurrence of UTUC or deterioration in renal function, thereby maintaining a stable eGFR.

CONCLUSION

Although evidence for nephron-sparing modalities for UTUC is mounting in recent literature, limited data still exists on cryotherapy as a line of treatment for urothelial carcinoma. We report successful management of a low-grade UTUC using cryoablation with the crucial aid of an initial renal biopsy and long-term follow-up. Our results provide insight into the role of cryoablation as a nephron-sparing approach for UTUC.

Upper Tract Urothelial Carcinoma: A Rare Malignancy with Distinct Immuno-Genomic Features in the Era of Precision-Based Therapies

Upper tract urothelial carcinoma (UTUC) is a rare malignancy, occurring in 5-10% of patients diagnosed with UC, and involves the renal pelvis, calyces, or ureters. UTUC can be sporadic or hereditary as a clinical manifestation of Lynch syndrome. Therapeutic management of these patients is challenging. Following risk stratification of localized disease, patients with low-grade UTUC may undergo kidney-sparing surgery or radical nephroureterectomy (RNU) and/or chemoablation with mitomycin-c instillation to reduce recurrence. In high-grade disease, RNU followed by adjuvant chemotherapy remains the standard of care. For decades, platinum-based chemotherapy has been the cornerstone of treatment for locally advanced and metastatic disease. The aim of the present review is to summarize recent advances in UTUC's therapeutic management through the lens of its genomic and immune landscape. Accumulating knowledge on the genetic and immune aspects of UTUC tumors has increased our understanding of their underlying biology, supporting a luminal papillary, T-cell depleted contexture and enrichment in fibroblast growth factor receptor (FGFR) expression. These advances have fueled successful clinical testing of several precision-based therapeutic approaches, including immune checkpoint inhibitors (ICIs), the antibody-drug conjugates (ADCs) enfortumab vedotin and sacituzumab govitecan, and agents targeting the FGFR axis such as erdafitinib and other kinase inhibitors, allowing their entry into the therapeutic armamentarium and improving the prognosis of these patients. Not all patients respond to these precision-based targeted therapies; thus, validating and expanding the toolkit of potential biomarkers of response or resistance, including molecular subtypes, FGFR pathway gene alterations, DNA repair gene defects, tumor mutational burden (TMB), circulating tumor DNA (ctDNA), nectin-4, TROP2, and programmed death ligand-1 (PD-L1), are key to maximizing the benefit to these particular subgroups of patients.

The useful technique of laparoscopic segmental ureterectomy with ureteral reimplantation for distal upper tract urothelial carcinoma

INTRODUCTION

Segmental ureterectomy (SU) has been proven effective in cases of distal upper tract urothelial carcinoma (UTUC). Nonetheless, SU has been performed infrequently in the real world, and there is no consensus on the preferred surgical technique in laparoscopic surgery. We describe our first experience of laparoscopic segmental ureterectomy (LSU) with psoas hitch ureteral reimplantation.

MATERIALS AND SURGICAL TECHNIQUE

LSU starts using a fan-shaped, five-port, transperitoneal approach. First, the cancerous ureter segment is clipped to avoid tumor seeding, and then the diseased segment is dissected. Second, the psoas hitch is performed by fixing the external part of the ipsilateral dome of the bladder to the psoas muscle and its tendon. Third, at the top of the bladder, an incision is made in the muscle layer and mucosa. The ureter is then spatulated. A guide wire is used to place a retrograde ureteral double J stent. Finally, the anastomosis of the bladder and ureter mucosa is performed by interrupted suturing of both ends, followed by continuous suturing, and the muscular layer of the bladder is closed in a double layer. We performed LSU for distal UTUC in 10 patients. There was no decrease in renal function before or after surgery. During follow-up, three patients experienced a recurrence of urothelial carcinoma in the bladder and one patient had a local recurrence.

DISCUSSION

LSU is a safe and feasible procedure in our experience, and it can be recommended for selected cases of distal UTUC with optimal perioperative, renal functional, and oncologic outcomes.

Segmental ureterectomy for high-risk ureteral carcinoma: a preliminary report

BACKGROUND

EAU guidelines strongly recommend kidney sparing surgery (KSS) as the primary treatment option for the low-risk UTUC patients. While there are few reports involving the KSS treated for the high-risk counterparts, especially the ureteral resection.

OBJECTIVE

To evaluate the effectiveness and safety of the segmental ureterectomy (SU) for the patients with high-risk ureteral carcinoma.

MATERIALS AND METHODS

We included 20 patients from May 2017 to December 2021 who underwent segmental ureterectomy (SU) in Henan Provincial People's Hospital. The overall survival (OS) and progression free survival (PFS) were evaluated. Besides, the ECOG scores and postoperative complications were also included.

RESULTS

As of December 2022, the mean OS was 62.1months (95%CI:55.6-68.6months) and the mean PFS was 45.0months (95%CI:35.9-54.1months). The median OS and median PFS were not reached. The 3-year OS rate was 70% and the 3-year PFS rate was 50%. The percentage of Clavien I and II complications was 15%.

CONCLUSION

For the selected patients with high-risk ureteral carcinoma, the efficacy and safety of segmental ureterectomy were satisfactory. But we still need to conduct prospective or randomized study to validate the value of SU in patients with high-risk ureteral carcinoma.

Current methods facilitating diagnosis of upper tract urothelial carcinoma: a comprehensive literature review

PURPOSE OF REVIEW

Currently, kidney-sparing surgeries are considered the preferred approach in low-risk tumours and in selected high-risk patients. Therefore, accurate diagnosis of UTUC is crucial for further management. The purpose of this review is to summarize available methods facilitating the diagnosis of upper tract urothelial carcinoma (UTUC).

RECENT FINDINGS

Recent articles propose numerous techniques of UTUC diagnosis. In this review, imaging, as well as, urine-based and endoscopic methods have been described and assessed.

SUMMARY

Regarding imaging, computed tomography urography remains a gold standard, while PET is superior in search for small lesions and nodal metastases. However, contrast-enhanced ultrasonography also shows promise. On the contrary, available urine tests, such as urinary cytology, fluorescent in-situ hybridization, Xpert, DNA methylation analysis, urine-based liquid biopsy, p16/Ki-67 dual immunolabelling, ImmunoCyt and NMP22 are either poorly researched, or not accurate enough to use solely. Finally, during ureterorenoscopy, photodynamic diagnosis and narrow-band imaging can facilitate proper visualization of the tumor. Endoluminal ultrasonography and confocal laser endomicroscopy can potentially improve staging and grading of UTUC. Also, the 'form tackle' biopsy should be performed using a basket in papillary lesions and cold-cup biopsy of flat or sessile lesions. Even though cryobiopsy shows promise in UTUC diagnosis, in-vivo studies are necessary before it is introduced into clinical practice.

Antegrade administration of mitomycin gel for upper tract urothelial carcinoma via percutaneous nephrostomy tube: a multi-institutional retrospective cohort study

OBJECTIVES

To assess the safety profile of antegrade mitomycin gel instillation through a percutaneous nephrostomy tube (PCNT) for upper tract urothelial carcinoma (UTUC) with the aim of decreasing morbidity associated with therapy.

PATIENTS AND METHODS

Patients undergoing antegrade administration of mitomycin gel via PCNT were retrospectively included for analysis from four tertiary referral centres between 2020 and 2022. The primary outcome was safety profile, as graded by Common Terminology Criteria for Adverse Events (v5.0). Post-therapy disease burden was assessed by primary disease evaluation (PDE) via ureteroscopy.

RESULTS

Thirty-two patients received at least one dose of mitomycin gel via PCNT for UTUC, 29 of whom completed induction and underwent PDE. Thirteen patients (41%) had residual tumour present prior to induction therapy. At a median of 15.0 months following first dose of induction therapy, ureteric stenosis occurred in three patients (9%), all of whom were treated without later recurrence or chronic stenosis. Other adverse events included fatigue (27%), flank pain (19%), urinary tract infection (12%), sepsis (8%) and haematuria (8%). No patients had impaired renal function during follow-up and there were no treatment-related deaths. Seventeen patients (59%) had no evidence of disease at PDE and have not experienced recurrence at a median follow-up of 13.0 months post induction.

CONCLUSIONS

Administration of mitomycin gel via a PCNT offers a low rate of ureteric stenosis, demonstrates a favourable safety profile, and is administered without general anaesthesia.