• Int. J. Clin. Pract. · Aug 2021

    Diagnostic accuracy of multiparametric MRI and 68 Ga-PSMA PET/MRI in detecting index tumours of prostate cancer.

    • Uğur Coşar, İlker Şen, Uğuray Aydos, Murat Yavuz Koparal, Murat Uçar, Nil Tokgöz, İpek Işık Gönül, Ümit Özgür Akdemir, Lütfiye Özlem Atay, and Tevfik Sinan Sözen.
    • Department of Urology, School of Medicine, Gazi University, Ankara, Turkey.
    • Int. J. Clin. Pract. 2021 Aug 1; 75 (8): e14287.

    ObjectiveTo evaluate the diagnostic accuracy of the 68 gallium (68 Ga) prostate-specific membrane antigen (PSMA) positron emission tomography/magnetic resonance imaging (PET/MRI) and multiparametric MRI (mpMRI) by region-based comparison of index tumour localisations using histopathological tumour maps of patients who underwent radical prostatectomy because of clinically significant prostate cancer.Patients And MethodsThe study included 64 patients who underwent radical prostatectomy after primary staging with mpMRI and 68 Ga-PSMA PET/MRI. Diagnostic analysis was performed by dividing the prostate into four anatomic regions as left/right anterior and left/right posterior. The extension of the lesions in mpMRI and the pathological uptake in 68 Ga-PSMA PET/MRI were matched separately for each region with the extension of the index tumour into each region.ResultsThe sensitivity, specificity, positive predictive value, negative predictive value, positive likelihood ratio, negative likelihood ratio, and the accuracy of mpMRI and 68 Ga-PSMA PET/MRI are shown as 55.7%, 91.8%, 80.6%, 77.2%, 78.1%, and 60.8%, 94.3%, 86.8% 79.8%, 83.5%, respectively. 68 Ga-PSMA PET/MRI has higher sensitivity and specificity compared with mpMRI. However, no statistically significant difference was found (P = .464). Combined imaging had significantly higher diagnostic accuracy compared with mpMRI and 68 Ga-PSMA PET/MRI (change in AUC: 0.084 and 0.046, P < .001 and P = .028, respectively), while no statistically significant difference was found between mpMRI and 68 Ga-PSMA PET/MRI (change in AUC: 0.038, P = .246).Conclusion68 Ga-PSMA PET/MRI had higher clinical diagnostic accuracy in prostate cancer compared with mpMRI. Diagnostic accuracy was significantly increased in the combined use of both imaging modalities.© 2021 John Wiley & Sons Ltd.

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