Outcomes of subsequent non-muscle-invasive bladder cancer treated with intravesical Bacillus Calmette-Guérin after radical nephroureterectomy for upper urinary tract urothelial carcinoma

BCG response and oncological outcomes in high risk nonmuscle invasive bladder cancer following previously treated upper tract urothelial carcinoma: A propensity-matched analysis

INTRODUCTION

Metachronous bladder recurrences after prior treatment for primary upper tract urothelial carcinoma (UTUC) can occur in ∼3% to 50% of patients. Because UTUC demonstrated distinct molecular alterations, bladder recurrences in these patients may be molecularly and phenotypically different compared to primary bladder carcinoma. We aim to study the BCG efficacy in patients with primary high risk nonmuscle invasive bladder cancer (P-NMIBC) and metachronous bladder recurrences after previous nephroureterectomy for UTUC (M-NMIBC).

METHODS

We reviewed an IRB-approved prospective uro-oncology database of patients who underwent resection followed by BCG therapy for high grade NMIBC from 2017 to 2021. Clinicopathological parameters, intravesical therapies and the oncological outcomes were analyzed. Patients in the P-NMIBC group were matched to patients in the M-NMIBC cohort (control) via propensity score matching (PSM) to adjust for potential clinicopathological confounders. Nearest-neighbor PSM targeting a 4:1 ratio of study to control subjects was performed using a caliper of 0.2, aiming for an absolute standardized mean difference of <0.1 across key covariates. Secondary outcomes were progression to distant metastasis and overall survival. Logistic and cox regression analyses were performed to elucidate independent variables associated with intravesical recurrences and disease progression.

RESULTS

Of the 183 patients diagnosed with NMIBC, 35 patients were identified to have a history of UTUC with radical nephroureterectomy. EAU risk stratification revealed 50 (27.3%) intermediate risk, 107 (58.5%) high risk and 26 (14.2%) very high risk groups. P-NMIBC patients were more likely to have symptomatic presentation (79.7% vs. 23.9%), and a larger mean tumor size (25.7 mm vs. 15.4 mm) than M-NMIBC. The mean follow-up duration for the study was 34.0 months. In the unmatched analysis, M-NMIBC was associated with increased risk of HG intravesical recurrence post BCG compared to P-NMIBC (54.3% vs. 28.4%, P = 0.006, HR 2.14, 95% CI: 1.25-3.65) and increased risk of progression to MIBC (28.6% vs. 4.7%, P = 0.007, HR 4.19, 95% CI: 1.47-11.95). For the propensity-matched analysis, the control group consisted of 35 M-NMIBC matched to 123 P-NMIBC patients for similar demographics, EAU risk score and BCG doses. M-NMIBC again demonstrated a higher HG intravesical recurrence rate (54.3% vs. 22.8%, P = 0.001, HR 2.67, 95% CI: 1.50-4.77), progression to MIBC (28.6% vs. 5.7%, P = 0.022, HR 3.42, 95% CI: 1.20-9.75) and progression to distant metastasis (20.0% vs. 6.5%, P = 0.033, HR 3.02, 95% CI: 1.09-8.35). Overall survival in both groups were not significantly different in both unmatched and matched analysis.

CONCLUSIONS

Our study indicates that BCG treatment may be less effective for NMIBC patients with a history of UTUC, with a higher risk of intravesical recurrences and disease progression. This is an important consideration when counselling patients for BCG treatment and overall prognostication.

Impact of Histological Subtypes/Divergent Differentiation on Clinicopathological and Oncological Outcomes for Patients with Upper Tract Urothelial Carcinoma Treated with Radical Nephroureterectomy: A Comprehensive Updated Systematic Review and Meta-analysis

BACKGROUND AND OBJECTIVE

Upper tract urothelial carcinoma (UTUC) is associated with poor survival. Recent studies have evaluated whether the presence of histological subtypes or divergent differentiation (HS/DD) is associated with worse UTUC prognosis. Our aim was to assess the relationship between HS/DD and clinicopathological features and oncological outcomes for patients with UTUC undergoing radical nephroureterectomy (RNU) without investigating causal pathways.

METHODS

A literature search was conducted in September 2024. Patients with UTUC who underwent RNU were included. The main outcomes were differences in clinicopathological features and oncological outcomes between HS/DD and pure urothelial carcinoma (PUC) groups.

KEY FINDINGS AND LIMITATIONS

We included 22 studies involving 14 407 patients in our review. HS/DD was present in 14% of tumours. In comparison to PUC, the HS/DD group had significantly higher rates of ≥pT3 stage, high-grade tumours, lymph node invasion (LNI), lymphovascular invasion (LVI), and receipt of adjuvant chemotherapy. Pooled results revealed that the HS/DD group had significantly worse cancer-specific survival (CSS) (hazard ratio [HR] 1.65, 95% confidence interval CI] 1.39-1.96), overall survival (OS; HR 1.84, 95% CI 1.52-2.22) ,and recurrence-free survival (RFS; HR 1.64, 95% CI 1.43-1.87). Intravesical RFS (IVRFS) and urothelial RFS (URFS) were comparable between the groups.

CONCLUSIONS AND CLINICAL IMPLICATIONS

Our findings suggest that UTUC with HS/DD is associated with more advanced/aggressive features, such as higher pathological stage and grade, LNI, and LVI. HS/DD is associated with significantly worse CSS, OS, and RFS, but does not predict worse IVRFS or URFS. Therefore, HS/DD detection should prompt extensive treatment and closer follow-up. To improve the quality of recommendations and patient care, well-designed studies with central pathological review are needed.

Impact of upper tract urothelial carcinoma history on patients with non-muscle invasive bladder cancer undergoing intravesical chemotherapy

This study was designed to evaluate the impact of upper tract urothelial carcinoma (UTUC) history on prognosis in patients with non-muscle-invasive bladder cancer (NMIBC) receiving intravesical chemotherapy. We conducted a single center, retrospective, cohort study of 444 NMIBC patients who received intravesical chemotherapy after transurethral resection of the bladder cancer (TURBT) at Peking University People's Hospital from 2000 to 2015. Patients were divided into UTUC-NMIBC group (with UTUC history) and primary NMIBC group (without UTUC history) by presence of previous UTUC. Demographic, clinical and pathologic factors were analyzed. Kaplan-Meier curves and the log-rank test were used to depict and compare recurrence-free survival (RFS) and progression-free survival (PFS) between the two groups. Multivariable Cox regression models were constructed to determine the variables associated with RFS and PFS. Compared to the primary NMIBC group (n = 410), the UTUC-NMIBC group (n = 34) had an older median age [72.0 (65.0-81.0) vs. 66.0 (58-75) years; P = 0.007], a higher incidence of multiple tumors (52.9% vs. 33.9%; P = 0.026) and a higher recurrence rate (52.9% vs. 30.7%; P = 0.008) and worse RFS (P < 0.001). In multivariate analysis, UTUC history was an independent risk factor for recurrence (hazard ratio = 2.242; P = 0.001), but not for progression. Interestingly, subgroup analysis indicated patients with recent UTUC history (≤ 24 months between UTUC and NMIBC diagnoses) were associated with increased recurrence rates (73.7% vs. 26.7%; P = 0.014). Presence of UTUC history was an independent risk factor for recurrence in patients with NMIBC who received intravesical chemotherapy, especially in those with a shorter interval between UTUC and NMIBC diagnoses.

Efficacy of BCG for non-muscle invasive bladder cancer following nephroureterectomy for upper tract urothelial carcinoma

PURPOSE

To evaluate the efficacy of intravesical (IVe) Bacillus Calmette-Guerin (BCG) to treat non-muscle invasive bladder cancer (NMIBC) recurrences in patients who have previously undergone nephroureterectomy for upper tract urothelial carcinoma (UTUC).

METHODS

We performed a single institution retrospective review of patients who underwent nephroureterectomy for UTUC from 2009 to 2021. Patients who subsequently developed NMIBC treated with transurethral resection followed by IVe BCG were included in the study group. A control cohort was formed by retrospective review of patents with primary NMIBC treated with BCG during the same period. Patients in the control cohort were matched by stage of bladder cancer at a 2:1 ratio of control to study subjects. Demographic data, pathology of bladder tumors prior to and following BCG, use of maintenance BCG (mBCG), time to recurrence, time to progression, progression to cystectomy, and progression to metastatic disease were collected on all patients. Descriptive statistics were utilized to compare the 2 groups. The primary outcome was progression to muscle invasive disease. Secondary outcomes included intravesical recurrence free survival, disease free survival, and progression to metastatic disease. Univariable and multivariable logistic regression analysis was performed to elucidate independent variables associated with bladder tumor recurrence. Multivariable Cox regression analysis was used to assess the impact of prior UTUC on time to bladder tumor recurrence.

RESULTS

One-hundred and ninety-one patients underwent nephroureterectomy at our institution from 2009 to 2021 for UTUC. Twenty-five patients were identified to have subsequently developed NMIBC recurrences treated with inductions BCG. The control group was comprised of 50 patients with primary NMIBC matched by stage of bladder cancer for which BCG was indicated in the study group. Median (interquartile range [IQR]) follow-up was significantly longer in the control group relative to the study group (64.8 [50.1-85.6] vs 25 months [17-35]; P = 0.001). There were no significant differences in demographics between the study and control groups. The rate of progression to muscle invasive disease was 17% vs 0% in the study group and control group respectively (P = 0.0521). History of UTUC was associated with increased risk of intravesical bladder tumor recurrence post BCG on multivariable analysis (HR 2.5; P = 0.017) and Kaplan Meier survival analysis (P = 0.039). The mean time to bladder tumor recurrence after treatment with BCG was significantly worse in the study group at (7.9 vs. 23.9 months; P = 0.0322). Similarly, the rate of progression to metastatic disease was worse in the study group (24% vs 2%; P = 0.0047). Overall disease-free survival was also noted to be significantly worse on Kaplan Meier survival analysis in the study group (P = 0.0074). No statistically significant differences in the stage grade of bladder tumor recurrence, grade of bladder tumor recurrence, or rate of progression to cystectomy were identified.

CONCLUSIONS

Our study suggests reduced efficacy of BCG for NMIBC in patients with a history of UTUC. Patients in this population should be counseled accordingly. Research into alternative treatments for bladder tumor recurrence and more aggressive prophylactic regimens after nephroureterectomy for prevention of bladder tumor recurrence in this population is encouraged.

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.

Clinical Characteristics and Current Status of Treatment for Recurrent Bladder Cancer after Surgeries on Upper Tract Urothelial Carcinoma

Upper tract urothelial carcinoma (UTUC) is a relatively rare, but highly malignant, disease with an estimated annual incidence of 2 cases per 100,000 people. The main surgical treatment modalities for UTUC are radical nephroureterectomy (RNU) with bladder cuff resection. After surgery, intravesical recurrence (IVR) can occur in up to 47% of patients, and 75% of them present with non-muscle invasive bladder cancer (NMIBC). However, there are few studies focused on the diagnosis and treatment of postoperatively recurrent bladder cancer for patients with previous UTUC history (UTUC-BC), and many of the influencing factors are still controversial. In this article, we performed a narrative review of the recent literature, mainly summarizing the factors influencing postoperative IVR in patients with UTUC and discussing the subsequent prevention, monitoring, and treatment tools for it.

Significant impact of a history of prior or concomitant upper urinary tract cancer on the recurrence and progression of non-muscle invasive bladder cancer

Background

The objective of the present study was to evaluate the prognostic impact of the upper urinary tract cancer status on recurrence-free survival and progression-free survival, and to develop risk stratification systems that include the upper urinary tract cancer status for patients with non-muscle invasive bladder cancer.

Patients and Methods

The present study included 40 (upper urinary tract cancer-non-muscle invasive bladder cancer group) and 285 (non-muscle invasive bladder cancer alone group) patients with and without a history of prior or concomitant upper urinary tract cancer, respectively. Nine clinicopathological findings between the two groups were compared, and risk stratification systems for the recurrence and progression of non-muscle invasive bladder cancer were developed.

Results

Recurrence-free survival and progression-free survival in the upper urinary tract cancer-non-muscle invasive bladder cancer group were significantly inferior to those in the NMIBC alone group (P &lt; 0.001 and P = 0.006, respectively). Multivariate analyses identified the following independent prognosticators: multiplicity and upper urinary tract cancer status for recurrence-free survival, and pT category and upper urinary tract cancer status for progression-free survival. Significant differences were noted by the risk stratification systems based on the positive number of independent predictors of recurrence-free survival and progression-free survival (P &lt; 0.001 and P = 0.007, respectively). The concordance indices of recurrence-free survival were 0.627, 0.588 and 0.499 in this study stratification, EORTC risk table and CUETO model, respectively. Those of progression-free survival were 0.752, 0.740 and 0.714, respectively.

Conclusion

The present results suggest the significant impact of a history of prior or concomitant UUTC on recurrence-free survival and progression-free survival in non-muscle invasive bladder cancer patients, and risk stratification systems that include the upper urinary tract cancer status for the recurrence and progression of non-muscle invasive bladder cancer are promising tools for predicting the outcomes of these patients.

Compared Efficacy of Adjuvant Intravesical BCG-TICE vs. BCG-RIVM for High-Risk Non-Muscle Invasive Bladder Cancer (NMIBC): A Propensity Score Matched Analysis

BACKGROUND

Intravesical immunotherapy with bacillus Calmette-Guerin (BCG) is the standard therapy for high-risk non-muscle invasive bladder cancer (NMIBC). The superiority of any BCG strain over another could not be demonstrated yet.

METHODS

Patients with NMIBCs underwent adjuvant induction ± maintenance schedule of intravesical immunotherapy with either BCG TICE or RIVM at two high-volume tertiary institutions. Only BCG-naïve patients and those treated with the same strain over the course of follow-up were included. One-to-one (1:1) propensity score matching (PSM) between the two cohorts was utilized to adjust for baseline demographic and tumor characteristics imbalances. Kaplan-Meier estimates and multivariable Cox regression models according to high-risk NMIBC prognostic factors were implemented to address survival differences between the strains. Sub-group analysis modeling of the influence of routine secondary resection (re-TUR) in the setting of the sole maintenance adjuvant schedule for the two strains was further performed.

RESULTS

852 Ta-T1 NMIBCs (n = 719, 84.4% on TICE; n = 133, 15.6% on RIVM) with a median of 53 (24-77) months of follow-up were reviewed. After PSM, no differences at 5-years RFS, PFS, and CSS at both Kaplan-Meier and Cox regression analyses were detected for the whole cohort. In the sub-group setting of full adherence to European/American Urology Guidelines (EAU/NCCN), BCG TICE demonstrated longer 5-years RFS compared to RIVM (68% vs. 43%, p = 0.008; HR: 0.45 95% CI 0.25-0.81).

CONCLUSION

When routinely performing re-TUR followed by a maintenance BCG schedule, TICE was superior to RIVM for RFS outcomes. However, no significant differences were detected for PFS and CSS, respectively.

Pyuria as a Predictive Marker of Bacillus Calmette-Guérin Unresponsiveness in Non-Muscle Invasive Bladder Cancer

This study aims to investigate the clinical role of preoperative pyuria for predicting bacillus Calmette-Guérin (BCG) unresponsiveness in non-muscle invasive bladder cancer (NMIBC). We performed a logistic regression analysis on 453 patients with NMIBC who were treated with BCG immunotherapy after a transurethral resection of bladder tumours, to evaluate predictive factors of BCG unresponsiveness. We also analysed univariate and multivariable survival data to estimate the prognostic impact of pyuria. Of the total study population, 37.6% (170/453) of patients had BCG unresponsiveness. A multivariable logistic regression analysis revealed that a history of upper urinary tract cancer (odds ratio (OR): 1.86, 95% confidence interval (CI): 1.04-3.32, p-value = 0.035) and the presence of pyuria (OR: 1.51, 95% CI: 1.01-2.27, p = 0.047) and tumour multiplicity (OR: 1.80, 95% CI: 1.18-2.75, p-value < 0.001) were significant predictors of BCG unresponsiveness. A Cox proportional hazards analysis model showed that pyuria was a significant prognostic factor for progression-free survival (hazard ratio: 4.51, 95% CI: 1.22-16.66, p = 0.024). A history of upper urinary tract cancer and the presence of pyuria and tumour multiplicity are predictive markers of BCG unresponsiveness. For patients with NMIBC who have preoperative pyuria, treatment using BCG should be considered cautiously.

Characterization and selection of Japanese electronic health record databases used as data sources for non-interventional observational studies

BACKGROUND

Interventional studies are the fundamental method for obtaining answers to clinical questions. However, these studies are sometimes difficult to conduct because of insufficient financial or human resources or the rarity of the disease in question. One means of addressing these issues is to conduct a non-interventional observational study using electronic health record (EHR) databases as the data source, although how best to evaluate the suitability of an EHR database when planning a study remains to be clarified. The aim of the present study is to identify and characterize the data sources that have been used for conducting non-interventional observational studies in Japan and propose a flow diagram to help researchers determine the most appropriate EHR database for their study goals.

METHODS

We compiled a list of published articles reporting observational studies conducted in Japan by searching PubMed for relevant articles published in the last 3 years and by searching database providers' publication lists related to studies using their databases. For each article, we reviewed the abstract and/or full text to obtain information about data source, target disease or therapeutic area, number of patients, and study design (prospective or retrospective). We then characterized the identified EHR databases.

RESULTS

In Japan, non-interventional observational studies have been mostly conducted using data stored locally at individual medical institutions (663/1511) or collected from several collaborating medical institutions (315/1511). Whereas the studies conducted with large-scale integrated databases (330/1511) were mostly retrospective (73.6%), 27.5% of the single-center studies, 47.6% of the multi-center studies, and 73.7% of the post-marketing surveillance studies, identified in the present study, were conducted prospectively. We used our findings to develop an assessment flow diagram to assist researchers in evaluating and choosing the most suitable EHR database for their study goals.

CONCLUSIONS

Our analysis revealed that the non-interventional observational studies were conducted using data stored local at individual medical institutions or collected from collaborating medical institutions in Japan. Disease registries, disease databases, and large-scale databases would enable researchers to conduct studies with large sample sizes to provide robust data from which strong inferences could be drawn.

Intravesical Recurrence After Radical Nephroureterectomy of Upper Urinary Tract Urothelial Carcinoma: A Large Population-Based Investigation of Clinicopathologic Characteristics and Survival Outcomes

Background: Of patients with upper urinary tract urothelial carcinoma (UTUC), 22–47% developed bladder recurrence after radical nephroureterectomy. Furthermore, the effect of surgery for UTUC-bladder cancer (BC) has not been well validated. The aim of this study was to assess the impact of standard primary BC surgical strategy on survival of patients diagnosed with UTUC-BC.

Patients and Methods: A total of 676 UTUC-BC patients and 197,753 primary BC patients diagnosed from 2004 to 2016, were identified based on the SEER database. The Kaplan-Meier method and the Fine and Gray competing risks analysis were performed to assess overall survival (OS) and cancer-specific mortality (CSM). Multivariate Cox regression model and competing risks regression model were used to identify independent risk factors. Propensity score matching (PSM) was also performed to adjust potential confounding factors.

Results: The baseline characteristics and survival outcomes of the two BC patient cohorts are quite different. For UTUC-BC patients, no significant difference in OS (NMIBC: p = 0.88; MIBC: p = 0.98) or cumulative incidence of CSM (NMIBC: p = 0.12; MIBC: p = 0.96) were noted for various surgical procedures. Local tumor treatment and partial cystectomy for UTUC-NMIBC patients produced lower 1-year (6.1%) and 3-year CSM (16.2%). Radical cystectomy for UTUC-MIBC patients produced lower 1-year (11.8%) but higher 3-year CSM (62.7%). After PSM for covariates, UTUC-BC patients still had a worse prognosis after surgery compared with primary BC patients. Based on regression models, older age, advanced T stage, N positive disease, M positive disease, and shorter interval between UTUC and BC were identified as independent risk factors for UTUC-BC patients.

Conclusion: Standard primary BC surgical strategy did not provide significant survival benefit for UTUC-BC patients. Compared with primary BC patients, UTUC-BC patients had a worse prognosis after surgery, suggesting that current primary BC surgical guidelines are not entirely appropriate for UTUC-BC patients. Our findings underscore the continued importance and need for better prognosis and improved guidelines for management of UTUC-BC patients.

Clinical Impact of Tumor-Infiltrating Lymphocytes and PD-L1-Positive Cells as Prognostic and Predictive Biomarkers in Urological Malignancies and Retroperitoneal Sarcoma

Simple Summary

Two host-dependent biological characteristics, “avoiding immune destruction” and “tumor-promoting inflammation” have been added to cancer hallmarks in 2011. The interaction and cross-talk among tumor cells and several immune cells in a tumor microenvironment are dynamic and complex processes. The purpose of this review is to discuss the prognostic impact of tumor-infiltrating lymphocytes and predictive biomarkers for immune checkpoint inhibitors in four urological solid tumors, the urothelial carcinoma, renal cell carcinoma, prostate cancer, and retroperitoneal sarcoma, through summarizing the findings of observation studies and clinical trials.

Abstract

Over the past decade, an “immunotherapy tsunami”, more specifically that involving immune checkpoint inhibitors (ICIs), has overtaken the oncological field. The interaction and cross-talk among tumor cells and several immune cells in the tumor microenvironment are dynamic and complex processes. As immune contexture can vary widely across different types of primary tumors and tumor microenvironments, there is still a significant lack of clinically available definitive biomarkers to predict patient response to ICIs, especially in urogenital malignancies. An increasing body of evidence evaluating urological malignancies has proven that tumor-infiltrating lymphocytes (TILs) are a double-edged sword in cancer. There is an urgent need to shed light on the functional heterogeneity in the tumor-infiltrating immune system and to explore its prognostic impact following surgery and other treatments. Notably, we emphasized the difference in the immunological profile among urothelial carcinomas arising from different primary origins, the bladder, renal pelvis, and ureter. Significant differences in the density of FOXP3-positive TILs, CD204-positive tumor-infiltrating macrophages, PD-L1-positive cells, and colony-stimulating factors were observed. This review discusses two topics: (i) the prognostic impact of TILs and (ii) predictive biomarkers for ICIs, to shed light on lymphocyte migration in four solid tumors, the urothelial carcinoma, renal cell carcinoma, prostate cancer, and retroperitoneal sarcoma.

Development and external validation of a preoperative nomogram for predicting pathological locally advanced disease of clinically localized upper urinary tract carcinoma

Objective

To develop and validate a preoperative nomogram to predict pathological locally advanced disease (pLAD) of clinically localized upper urinary tract urothelial carcinoma (UTUC) treated with extirpative surgery.

Methods

In total, 1101 patients with cN0M0 UTUC (development cohort, n = 604; validation cohort, n = 497) from 2 independent academic databases were retrospectively analyzed. pLAD was defined as pT3/4 and/or pN+. Multivariate logistic regression was used to develop a nomogram. The accuracy of the nomogram was evaluated with a receiver operating characteristic curve, calibration plot, and decision curve analysis.

Results

The development and validation cohorts comprised 204 (33.8%) and 178 (35.8%) patients with pLAD, respectively. The multivariate analyses showed that the neutrophil‐to‐lymphocyte ratio (hazard ratio [HR], 2.27; P < .001), chronic kidney disease (HR, 1.56; P = .032), tumor location (HR, 1.60; P = .029), hydronephrosis (HR, 2.71; P < .001), and local invasion on imaging (HR, 8.59; P < .001) were independent predictive factors. After bootstrapping, a well‐calibrated nomogram achieved discriminative accuracy of 0.77 in the development cohort. The decision curve analysis demonstrated improved risk prediction against threshold probabilities (≥8%) of pLAD. These results were consistent in the validation cohort.

Conclusion

Our novel nomogram allows for more highly accurate prediction of pLAD of UTUC. This nomogram integrates standard imaging and laboratory factors that help to identify patients who will benefit from preoperative chemotherapy, extended lymph node dissection, or both.

Poly(amidoamine)-modified mesoporous silica nanoparticles as a mucoadhesive drug delivery system for potential bladder cancer therapy

Bladder cancer, with the highest recurrence rate in all malignancy, is a common urologic cancer that arises on the bladder mucosa. Currently, tumor resection followed by intravesical chemotherapy is the primary treatment of bladder cancer, which has limited effectiveness ascribe to short dwell-time of intravesical drugs in bladder. Therefore, there is a need to develop mucoadhesive and sustained drug delivery systems to increase drug residence time for intravesical chemotherapy. In this study, poly(amidoamine) (PAMAM) dendrimers were modified onto the surface of mesoporous silica nanoparticles (MSNPs) through a layer-by-layer grafting method. A series of PAMAM-modified MSNPs were prepared and compared for their mucoadhesive capabilities on pig bladder wall and controlled drug release properties. Results demonstrated an increase in the mucoadhesive capacity of PAMAM-modified MSNPs upon an increase in the number of PAMAM amino groups, and the maximum nanoparticle mucoadhesivity was observed after two-generation PAMAM were grafted on the surface of MSNPs. An antineoplastic, doxorubicin, was encapsulated in the mesopores of PAMAM-modified MSNPs, and the drug-loaded nanoparticles can provide a sustained drug release triggered by acidic pH. The present study demonstrates that the mucoadhesive and drug release properties of MSNPs can be controlled by the layer number of PAMAM dendrimers on the nanoparticle surface, holding significant potential for the development of mucoadhesive drug delivery systems for bladder cancer therapy.