Abstract
Objectives
To investigate if removing DCE from the Vesical Imaging Reporting and Data System (VI-RADS) influences the diagnostic accuracy of muscle-invasive bladder cancer (MIBC). We also explored using different reference standards on the MRI diagnostic performance.
Methods
We searched the Cochrane Library, Embase, and PubMed databases to June 26, 2021. Pooled biparametric MRI (bpMRI, T2WI+DWI) and multiparametric MRI (mpMRI, T2WI+DWI+DCE) sensitivities and specificities and the diagnostic performances of these methods for MIBC were compared using different reference standards.
Results
Seventeen studies with 2344 patients were finally included, of which 7 studies, including 1041 patients, reported the diagnostic performance of bpMRI. VI-RADS showed sensitivities and specificities of 0.91 (95% CI 0.87–0.94) and 0.86 (95% CI 0.77–0.91) at cutoff scores of 3, and 0.85 (95% CI 0.77–0.90) and 0.93 (95% CI 0.89–0.96) at cutoff scores of 4. BpMRI showed sensitivities and specificities of 0.90 (95% CI 0.69–0.97) and 0.90 (95% CI 0.81–0.95), and 0.84 (95% CI 0.78–0.88) and 0.97 (95% CI 0.87–0.99), respectively, for cutoff scores of 3 and 4. The sensitivities of bpMRI vs mpMRI for MIBC were not significantly different, but bpMRI was more specific than mpMRI at cutoff scores of 3 (p = 0.02) and 4 (p = 0.02). The VI-RADS studies using primary transurethral resection of bladder tumors (TURBT) as the reference standard had significantly higher sensitivities (p < 0.001) than those using secondary TURBT or radical cystectomy as the reference.
Data conclusion
BpMRI and conventional VI-RADS had similar diagnostic efficacies for MIBC. Since MRI overestimated MIBC diagnoses using primary TURBT as the reference standard, we recommend using secondary TURBT as the reference standard.
Key Points
• Biparametric MRI without DCE had similar diagnostic efficacies for MIBC compared with conventional VI-RADS.
• The sensitivity of VI-RADS was overestimated when referring to the primary TURBT results.
• Biparametric MRI comprised of T2WI and DWI could be used for detecting MIBC in clinical practice.
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Abbreviations
- AUC:
-
Area under the curve
- BC:
-
Bladder cancer
- BpMRI:
-
Biparametric magnetic resonance imaging
- DCE:
-
Dynamic contrast enhancement
- DWI:
-
Diffusion-weighted imaging
- HsROC:
-
Hierarchical summary receiver operating characteristic curve
- MIBC:
-
Muscle-invasive bladder cancer
- mpMRI:
-
Multiparametric magnetic resonance imaging
- NMIBC:
-
Non-muscle-invasive bladder cancer
- NPV:
-
Negative predictive value
- PPV:
-
Positive predictive value
- QUADAS-2:
-
Quality Assessment of Diagnostic Accuracy Studies-2
- RC:
-
Radical cystectomy
- T2WI:
-
T2-weighted imaging
- TURBT:
-
Transurethral resection of bladder tumor
- VI-RADS:
-
Vesical Imaging Reporting and Data System
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Ye, L., Chen, Y., Xu, H. et al. Biparametric magnetic resonance imaging assessment for detection of muscle-invasive bladder cancer: a systematic review and meta-analysis. Eur Radiol 32, 6480–6492 (2022). https://doi.org/10.1007/s00330-022-08696-5
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DOI: https://doi.org/10.1007/s00330-022-08696-5