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Is Prolonged Systemic Immunotherapy Necessary After Achieving Tumor-free Status in Patients With Extensive Transurethrally Unresectable Very-high-risk NMIBC?

28 mai 2026 mis à jour par: Tianjin Medical University Second Hospital

Randomized Trial of Active Surveillance Versus Continued Systemic Immunotherapy After Achieving Tumor-Free Status in Extensive Transurethrally Unresectable Very-High-Risk NMIBC

Patients with extensive transurethrally unresectable very-high-risk non-muscle-invasive bladder cancer (NMIBC) may achieve a tumor-free status after systemic immunotherapy-based bladder-sparing treatment combined with transurethral resection of bladder tumor (TURBT). However, the optimal duration of systemic immunotherapy after achieving a tumor-free status remains uncertain. Prolonged treatment may increase toxicity, treatment burden, and cost, while some patients may maintain durable disease control without continued therapy.

This randomized study aims to evaluate whether active surveillance after achieving tumor-free status is a feasible alternative to continued systemic immunotherapy in patients with extensive transurethrally unresectable very-high-risk NMIBC.

Patients will initially receive systemic immunotherapy-based treatment followed by disease evaluation using cystoscopy with biopsy and/or TURBT, urine cytology, urinary tumor DNA (utDNA), and imaging assessments. Patients who achieve tumor-free status after treatment and complete resection of visible disease will be randomized to either active surveillance or continued systemic immunotherapy.

The study will evaluate recurrence outcomes, bladder preservation, progression, safety, and patient management strategies following achievement of tumor-free status. The trial also aims to explore the role of urinary tumor DNA in identifying patients who may safely undergo treatment de-escalation and active surveillance.

Aperçu de l'étude

Statut

Pas encore de recrutement

Les conditions

Intervention / Traitement

Type d'étude

Interventionnel

Inscription (Estimé)

120

Phase

  • Phase 2

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

Sauvegarde des contacts de l'étude

Lieux d'étude

  • Chine
      • Tianjin, Chine
        • General Hospital of Tianjin Medical University
        • Contact:
          • Liang Wang
          • Numéro de téléphone: +8615620530409
          • E-mail: wjlmnwk@163.com
      • Tianjin, Chine, 300000
        • The Second Hospital of Tianjin Medical University
        • Contact:
      • Tianjin, Chine
        • Tianjin Hospital
        • Contact:
          • Guangbin Zhu
          • Numéro de téléphone: +8613903124399
          • E-mail: zgb2016@163.com
      • Xingtai, Chine
        • Xingtai People's Hospital
        • Contact:
          • Junli Wei
          • Numéro de téléphone: +8617299180245
          • E-mail: wjluro@163.com

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte
  • Adulte plus âgé

Accepte les volontaires sains

Non

La description

Inclusion Criteria

  • Has histologically confirmed very-high-risk non-muscle-invasive urothelial carcinoma of the bladder.
  • Has transurethrally unresectable bladder tumor, defined as visually incomplete TURBT and/or extensive high-volume disease considered unsuitable for complete and oncologically adequate transurethral resection.
  • Has undergone cystoscopy and TURBT evaluation before study enrollment.
  • Has received systemic PD-1/PD-L1 inhibitor-based bladder-sparing therapy before randomization.

  • Has achieved tumor-free status before randomization, defined as:

    1. No visible bladder tumor on cystoscopy;
    2. Negative bladder biopsy and/or TURBT pathology;
    3. Negative urine cytology;
    4. Negative urinary tumor DNA (utDNA);
    5. No radiographic evidence of progression or metastasis.
  • Has Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2.
  • Has adequate organ function.
  • Has provided written informed consent.

Cohort A Only

  • Achieved tumor-free status at the initial response evaluation after induction systemic therapy.
  • Maintained tumor-free status after additional systemic therapy before randomization.

Cohort B Only

  • Did not achieve tumor-free status at the initial response evaluation because of residual non-muscle-invasive disease.
  • Subsequently underwent complete TURBT/resection of residual disease followed by additional systemic therapy.
  • Achieved tumor-free status at the second response evaluation before randomization.

Exclusion Criteria

  • Has muscle-invasive bladder cancer (≥T2), locally advanced unresectable disease, nodal disease, or distant metastasis.
  • Has concurrent upper tract urothelial carcinoma.
  • Has persistent visible tumor, positive bladder pathology, positive urine cytology, or positive utDNA before randomization.
  • Has received prior systemic immunotherapy for metastatic urothelial carcinoma.
  • Has active autoimmune disease requiring systemic treatment.
  • Is receiving systemic immunosuppressive therapy.
  • Has uncontrolled infection requiring systemic therapy.
  • Has another active malignancy requiring systemic treatment.
  • Has known active hepatitis B, hepatitis C, human immunodeficiency virus infection, or active tuberculosis.
  • Has pregnancy or breastfeeding.
  • Has any medical or psychiatric condition that, in the investigator's judgment, would interfere with study participation or interpretation of results.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: Arm A-1 (Cohort A Active Surveillance)
Patients in Cohort A who achieve early tumor-free status after initial systemic immunotherapy-based treatment will undergo active surveillance with protocol-defined cystoscopy, urine cytology, urinary tumor DNA testing, biopsy as clinically indicated, and imaging assessments.
Comportemental: Active Surveillance
Patients undergo protocol-defined surveillance after achieving tumor-free status, including cystoscopy, biopsy as clinically indicated, urine cytology, urinary tumor DNA testing, and imaging assessments, without continued systemic PD-1/PD-L1 inhibitor therapy unless disease recurrence or progression occurs.
Comparateur actif: Arm A-2 (Cohort A Continued Systemic Immunotherapy)
Patients in Cohort A who achieve early tumor-free status after initial systemic immunotherapy-based treatment will continue systemic immunotherapy for a protocol-defined duration with ongoing disease surveillance.
Médicament: PD-1/PD-L1 Inhibitor-Based Systemic Immunotherapy
Patients continue protocol-defined systemic PD-1/PD-L1 inhibitor therapy after achieving tumor-free status for up to approximately 1 year, with ongoing surveillance including cystoscopy, urine cytology, urinary tumor DNA testing, and imaging assessments.
Expérimental: Arm B-1 (Cohort B Active Surveillance)
Patients in Cohort B who do not achieve tumor-free status at initial evaluation but subsequently achieve tumor-free status after complete TURBT/resection and additional systemic immunotherapy will undergo active surveillance with protocol-defined surveillance assessments.
Comportemental: Active Surveillance
Patients undergo protocol-defined surveillance after achieving tumor-free status, including cystoscopy, biopsy as clinically indicated, urine cytology, urinary tumor DNA testing, and imaging assessments, without continued systemic PD-1/PD-L1 inhibitor therapy unless disease recurrence or progression occurs.
Comparateur actif: Arm B-2 (Cohort B Continued Systemic Immunotherapy)
Patients in Cohort B who subsequently achieve tumor-free status after complete TURBT/resection and additional systemic immunotherapy will continue systemic immunotherapy for a protocol-defined duration with ongoing disease surveillance.
Médicament: PD-1/PD-L1 Inhibitor-Based Systemic Immunotherapy
Patients continue protocol-defined systemic PD-1/PD-L1 inhibitor therapy after achieving tumor-free status for up to approximately 1 year, with ongoing surveillance including cystoscopy, urine cytology, urinary tumor DNA testing, and imaging assessments.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Bladder-intact event-free survival (BI-EFS)
Délai: Up to 2 years from randomization
Time from randomization to the first occurrence of high-risk NMIBC recurrence, progression to muscle-invasive bladder cancer, distant metastasis, radical cystectomy, or death from any cause.
Up to 2 years from randomization

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Recurrence-free survival (RFS)
Délai: Up to 2 years from randomization
Time from randomization to the first documented recurrence of bladder cancer or death from any cause.
Up to 2 years from randomization
Progression-free survival (PFS)
Délai: Up to 2 years from randomization
Time from randomization to progression to muscle-invasive, locally advanced, or metastatic bladder cancer, or death from any cause.
Up to 2 years from randomization
Radical cystectomy-free survival (RCFS)
Délai: Up to 2 years from randomization
Time from randomization to radical cystectomy or death from any cause.
Up to 2 years from randomization
Overall survival (OS)
Délai: Up to 2 years from randomization
Time from randomization to death from any cause.
Up to 2 years from randomization
Incidence of treatment-related adverse events
Délai: Up to 2 years from randomization
Proportion of patients experiencing treatment-related adverse events, graded according to CTCAE.
Up to 2 years from randomization

Autres mesures de résultats

Mesure des résultats
Description de la mesure
Délai
Recurrence-Free Survival According to Urinary Tumor DNA Status
Délai: Up to 2 years from randomization
Recurrence-free survival will be evaluated according to urinary tumor DNA status after achieving tumor-free status. Urinary tumor DNA status will be assessed using a urine-based tumor DNA assay and categorized as positive or negative.
Up to 2 years from randomization
utDNA conversion during surveillance
Délai: Up to 2 years from initial systemic administration
Proportion of patients with conversion from urinary tumor DNA negative to positive during follow-up.
Up to 2 years from initial systemic administration
Bladder-Intact Event-Free Survival According to Response Cohort in the Active Surveillance Arm
Délai: Up to 2 years from randomization
Bladder-intact event-free survival will be compared between participants assigned to active surveillance in Cohort A and Cohort B.
Up to 2 years from randomization
Recurrence-Free Survival According to Response Cohort in the Active Surveillance Arm
Délai: Up to 2 years from randomization
Recurrence-free survival will be compared between participants assigned to active surveillance in Cohort A and Cohort B.
Up to 2 years from randomization
Bladder-Intact Event-Free Survival According to Response Cohort in the Continued Systemic Immunotherapy Arm
Délai: Up to 2 years from randomization
Bladder-intact event-free survival will be compared between participants assigned to continued systemic immunotherapy in Cohort A and Cohort B.
Up to 2 years from randomization
Recurrence-Free Survival According to Response Cohort in the Continued Systemic Immunotherapy Arm
Délai: Up to 2 years from randomization
Recurrence-free survival will be compared between participants assigned to continued systemic immunotherapy in Cohort A and Cohort B.
Up to 2 years from randomization

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Tianjin Medical University Second Hospital

Les enquêteurs

  • Chercheur principal: Hailong Hu, MD, Department of Urology, The Second Hospital of Tianjin Medical University

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

30 mai 2026

Achèvement primaire (Estimé)

30 mars 2029

Achèvement de l'étude (Estimé)

30 mai 2032

Dates d'inscription aux études

Première soumission

21 mai 2026

Première soumission répondant aux critères de contrôle qualité

28 mai 2026

Première publication (Réel)

4 juin 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

4 juin 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

28 mai 2026

Dernière vérification

1 mai 2026

Plus d'information

Termes liés à cette étude

Mots clés

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • Truce-LB03

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

OUI

Type d'informations de prise en charge du partage d'IPD

  • PROTOCOLE D'ÉTUDE
  • SÈVE

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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