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Prospective comparison of 68Ga-PSMA PET/CT, 18F-sodium fluoride PET/CT and diffusion weighted-MRI at for the detection of bone metastases in biochemically recurrent prostate cancer

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Abstract

Purpose

To prospectively compare diagnostic accuracies for detection of bone metastases by 68Ga-PSMA PET/CT, 18F-NaF PET/CT and diffusion-weighted MRI (DW600-MRI) in prostate cancer (PCa) patients with biochemical recurrence (BCR).

Methods

Sixty-eight PCa patients with BCR participated in this prospective study. The patients underwent 68Ga-PSMA PET/CT, a 18F-NaF PET/CT and a DW600-MRI (performed in accordance with European Society of Urogenital Radiology guidelines, with b values of 0 and 600 s/mm2). Bone lesions were categorized using a three-point scale (benign, malignant or equivocal for metastases) and a dichotomous scale (benign or metastatic) for each imaging modality by at least two experienced observers. A best valuable comparator was defined for each patient based on study-specific imaging, at least 12 months of clinical follow-up and any imaging prior to the study and during follow-up. Diagnostic performance was assessed using a sensitivity analysis where equivocal lesions were handled as non-metastatic and then as metastatic.

Results

Ten of the 68 patients were diagnosed with bone metastases. On a patient level, sensitivity, specificity and the area under the curve (AUC) by receiver operating characteristic analysis were, respectively, 0.80, 0.98–1.00 and 0.89–0.90 for 68Ga-PSMA PET/CT (n = 68 patients); 0.90, 0.90–0.98 and 0.90–0.94 for 18NaF PET/CT (n = 67 patients); and 0.25–0.38, 0.87–0.92 and 0.59–0.62 for DW600-MRI (n = 60 patients). The diagnostic performance of DW600-MRI was significantly lower than that of 68Ga-PSMA PET/CT and 18NaF PET/CT for diagnosing bone metastases (p < 0.01), and no significant difference in the AUC was seen between 68Ga-PSMA PET/CT and 18NaF PET/CT (p = 0.65).

Conclusion

68Ga-PSMA PET/CT and 18F-NaF PET/CT showed comparable and high diagnostic accuracies for detecting bone metastases in PCa patients with BCR. Both methods performed significantly better than DW600-MRI, which was inadequate for diagnosing bone metastases when conducted in accordance with European Society of Urogenital Radiology guidelines.

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Funding

This study was supported by unrestricted grants from the Obel Family Foundation and the Danielsen foundation.

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Correspondence to Helle D. Zacho.

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Conflict of interest

HDZ received grant funding from the Danielsen Foundation, NdS receives grant funding from Cancer Research UK, KDP is a Cancer Research UK funded fellow and LJP receives grant foundation form the Obel Family Foundation. The authors have no other conflicts of interest regarding the present manuscript.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.

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Zacho, H.D., Nielsen, J.B., Afshar-Oromieh, A. et al. Prospective comparison of 68Ga-PSMA PET/CT, 18F-sodium fluoride PET/CT and diffusion weighted-MRI at for the detection of bone metastases in biochemically recurrent prostate cancer. Eur J Nucl Med Mol Imaging 45, 1884–1897 (2018). https://doi.org/10.1007/s00259-018-4058-4

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