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Comparison of CT and MR (VI-RADS) Imaging for Local Bladder Cancer Staging

15 mai 2026 mis à jour par: Andreas Habberstad, Oslo University Hospital

Prospective Diagnostic Accuracy Study Comparing CT and MRI (VI-RADS) for Local Staging of Newly Diagnosed Bladder Cancer

This prospective diagnostic accuracy study compares computed tomography (CT) and multiparametric magnetic resonance imaging (MRI) using the Vesical Imaging-Reporting and Data System (VI-RADS) for local staging of newly diagnosed bladder cancer. All participants undergo both imaging modalities prior to transurethral resection of the bladder tumor (TURBT) or cystectomy. Histopathology serves as the reference standard.

Aperçu de l'étude

Statut

Recrutement

Les conditions

Description détaillée

Accurate local staging is crucial for distinguishing non-muscle-invasive from muscle-invasive bladder cancer and guiding treatment decisions. While CT is widely used in clinical practice, MRI with VI-RADS has demonstrated higher diagnostic performance in previous retrospective and meta-analytic studies. However, prospective paired comparisons in the same patients are limited.

In this single-center prospective study, newly diagnosed bladder cancer patients undergo cystoscopy, contrast-enhanced CT, and multiparametric MRI prior to definitive histopathological sampling. Two radiologists independently assess imaging in a blinded research setting. Diagnostic performance of MRI and CT is compared using paired statistical analyses, with additional evaluation of interobserver agreement and tumor characteristics.

Type d'étude

Observationnel

Inscription (Estimé)

150

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

Nom: Study Coordinator, Department of Urology
Numéro de téléphone: +47 22 89 40 00
E-mail: postmottak@ous-hf.no

Lieux d'étude

Norvège
- - Oslo, Norvège
    - Recrutement
    - Oslo University Hospital
    - Contact:
      
      Study Coordinator, Department of Urology
      
      Numéro de téléphone: +47 22 89 40 00
      
      E-mail: postmottak@ous-hf.no
    - Chercheur principal:
      
      Andreas Habberstad, MD, PhD

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

Méthode d'échantillonnage

Échantillon non probabiliste

Population étudiée

The study population consists of adult patients with newly diagnosed bladder cancer identified on cystoscopy at a tertiary referral hospital. Eligible participants are patients planned for transurethral resection of the bladder tumor (TURBT) and/or cystectomy as part of standard clinical care, and who are able to undergo both contrast-enhanced computed tomography (CT) and multiparametric magnetic resonance imaging (MRI) prior to definitive histopathological assessment.

Patients are included irrespective of tumor stage or grade at presentation, provided that imaging is performed within the defined preoperative diagnostic pathway. Patients with prior bladder cancer treatment or contraindications to imaging are excluded.

La description

Inclusion Criteria:

Age ≥ 18 years
Newly diagnosed bladder cancer on cystoscopy
Planned TURBT or cystectomy within 6 weeks
Eligible for both CT and MRI within 6 weeks
Written informed consent provided

Exclusion Criteria:

Contraindications to MRI or iodinated contrast media
Prior treatment for bladder cancer
Pregnancy
Non-malignant bladder lesions
Tumors located in bladder diverticula

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

Nombre de groupes / cohortes

Cohortes et interventions

Groupe / Cohorte
Imaging Comparison Group All participants undergo contrast-enhanced CT and multiparametric MRI (VI-RADS) as part of routine diagnostic work-up prior to transurethral resection of the bladder tumor or cystectomy. Imaging findings are compared with histopathology for assessment of diagnostic accuracy.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats	Description de la mesure	Délai
Diagnostic Accuracy for Detection of Muscle-Invasive Bladder Cancer (≥T2) Délai: From imaging to final histopathological reference standard (up to 12 months)	The primary outcome is the diagnostic accuracy of multiparametric magnetic resonance imaging (MRI) using the Vesical Imaging-Reporting and Data System (VI-RADS) compared with contrast-enhanced computed tomography (CT) for the detection of muscle-invasive bladder cancer (pathological stage ≥T2). Sensitivity and specificity will be calculated using histopathology from transurethral resection of the bladder tumor, re-TURBT, and/or cystectomy as the reference standard.	From imaging to final histopathological reference standard (up to 12 months)

Mesures de résultats secondaires

Mesure des résultats	Description de la mesure	Délai
Positive and Negative Predictive Values Délai: From imaging to final histopathological reference standard (up to 12 months)	Positive predictive value (PPV) and negative predictive value (NPV) of MRI (VI-RADS) and CT for detection of muscle-invasive bladder cancer (≥T2), calculated using histopathology as the reference standard.	From imaging to final histopathological reference standard (up to 12 months)
Interobserver Agreement for MRI and CT Tumor Staging Délai: During blinded image evaluation following imaging acquisition	Interobserver agreement between two independent radiologists for MRI VI-RADS scoring and CT-based T-stage assessment, quantified using weighted kappa statistics in a blinded research reading setting.	During blinded image evaluation following imaging acquisition
Proportion of correctly classified Tumor T-stage (Ta-T4) by MRI and CT Délai: From imaging to final histopathological reference standard (up to 12 months)	Proportion of correctly classified tumor T-stage (Ta-T4) by MRI and CT compared with histopathological staging from TURBT and/or cystectomy.	From imaging to final histopathological reference standard (up to 12 months)
Diagnostic accuracy of MRI and CT for detection of muscle-invasive bladder cancer within tumor subgroups Délai: From imaging to final histopathological reference standard (up to 12 months)	Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of MRI and CT for detection of muscle-invasive bladder cancer, assessed within predefined tumor subgroups (tumor size, morphology, tumor location and multiplicity), using histopathology as the reference standard.	From imaging to final histopathological reference standard (up to 12 months)

Collaborateurs et enquêteurs

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

Parrainer

Oslo University Hospital

Les enquêteurs

Chercheur principal: Andreas Habberstad, MD, PhD, Oslo University Hospital

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 (Réel)

22 avril 2026

Achèvement primaire (Estimé)

30 avril 2028

Achèvement de l'étude (Estimé)

31 octobre 2028

Dates d'inscription aux études

Première soumission

9 mai 2026

Première soumission répondant aux critères de contrôle qualité

15 mai 2026

Première publication (Réel)

22 mai 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)