Abstract
Objective
To determine the effectiveness of whole-body diffusion-weighted magnetic resonance imaging (WB-DW-MRI) in detecting metastases by comparing the results with those from choline-positron emission tomography-computed tomography (choline-PET/CT) in patients with biochemical relapse after primary treatment, and no metastases in bone scintigraphy, CT and/or pelvic MRI, or metastatic/oligometastatic prostate cancer (PCa). Patients with this disease profile who could benefit from treatment with stereotactic body radiation therapy (SBRT) were selected and their responses to these techniques were rated.
Materials and methods
This was a prospective, controlled, unicentric study, involving 46 consecutive patients from our centre who presented biochemical relapse after adjuvant, salvage or radical treatment with external beam radiotherapy, or brachytherapy. After initial tests (bone scintigraphy, CT, pelvic MRI), 35 patients with oligometastases or without them were selected. 11 patients with multiple metastases were excluded from the study. WB-DW-MRI and choline-PET/CT was then performed on each patient within 1 week. The results were interpreted by specialists in nuclear medicine and MRI. If they were candidates for treatment with ablative SBRT (SABR), they were then evaluated every three months with both tests.
Results
Choline-PET/CT detected lesions in 16 patients that were not observable using WB-DW-MRI. The results were consistent in seven patients and in three cases, a lesion was observed using WB-DW-MRI that was not detected with choline-PET/CT. The Kappa value obtained was 0.133 (p = 0.089); the sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) of WB-DW-MRI were estimated at 44.93, 64.29, 86.11, and 19.15%, respectively. For choline-PET/CT patients, the sensitivity, specificity, PPV, and NPV were 97.10, 58.33, 93.06, and 77.78%, respectively.
Conclusions
Choline-PET/CT has a high global sensitivity while WB-DW-MRI has a high specificity, and so they are complementary techniques. Future studies with more enrolled patients and a longer follow-up period will be required to confirm these data. The initial data show that the best technique for evaluating response after SBRT is choline-PET/CT.
Trial registration number NCT02858128.
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Acknowledgements
The authors wish to thank the Provincial Hospital of Castellón Foundation for their assistance in the development of this manuscript and the Eresa Foundation for the grant that has allowed to fund this study.
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This study was approved by our internal institutional review board, and written informed consent with guarantees of confidentiality was obtained from all human participants.
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This study has been made possible thanks to the funds granted prior public call for research proposals of the Eresa Foundation. Award Number: BF13004. Grant recipient: Antonio José Conde Moreno M.D. Ph.D. The role of the funding was the cost of the explorations and the costs of statistical analysis.
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Conde-Moreno, A.J., Herrando-Parreño, G., Muelas-Soria, R. et al. Whole-body diffusion-weighted magnetic resonance imaging (WB-DW-MRI) vs choline-positron emission tomography-computed tomography (choline-PET/CT) for selecting treatments in recurrent prostate cancer. Clin Transl Oncol 19, 553–561 (2017). https://doi.org/10.1007/s12094-016-1563-4
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DOI: https://doi.org/10.1007/s12094-016-1563-4