Abstract
Purpose
The positron emission tomography (PET) tracer 68Ga-PSMA-11, targeting the prostate-specific membrane antigen (PSMA), is rapidly excreted into the urinary tract. This leads to significant radioactivity in the bladder, which may limit the PET-detection of local recurrence (LR) of prostate cancer (PC) after radical prostatectomy (RP), developing in close proximity to the bladder. Here, we analyze if there is additional value of multi-parametric magnetic resonance imaging (mpMRI) compared to the 68Ga-PSMA-11-PET-component of PET/CT or PET/MRI to detect LR.
Methods
One hundred and nineteen patients with biochemical recurrence after prior RP underwent both hybrid 68Ga-PSMA-11-PET/CTlow-dose (1 h p.i.) and -PET/MRI (2-3 h p.i.) including a mpMRI protocol of the prostatic bed. The comparison of both methods was restricted to the abdomen with focus on LR (McNemar). Bladder-LR distance and recurrence size were measured in axial T2w-TSE. A logistic regression was performed to determine the influence of these variables on detectability in 68Ga-PSMA-11-PET. Standardized-uptake-value (SUVmean) quantification of LR was performed.
Results
There were 93/119 patients that had at least one pathologic finding. In addition, 18/119 Patients (15.1%) were diagnosed with a LR in mpMRI of PET/MRI but only nine were PET-positive in PET/CT and PET/MRI. This mismatch was statistically significant (p = 0.004). Detection of LR using the PET-component was significantly influenced by proximity to the bladder (p = 0.028). The PET-pattern of LR-uptake was classified into three types (1): separated from bladder; (2): fuses with bladder, and (3): obliterated by bladder). The size of LRs did not affect PET-detectability (p = 0.84), mean size was 1.7 ± 0.69 cm long axis, 1.2 ± 0.46 cm short-axis. SUVmean in nine men was 8.7 ± 3.7 (PET/CT) and 7.0 ± 4.2 (PET/MRI) but could not be quantified in the remaining nine cases (obliterated by bladder).
Conclusion
The present study demonstrates additional value of hybrid 68Ga-PSMA-11-PET/MRI by gaining complementary diagnostic information compared to the 68Ga-PSMA-11-PET/CTlow-dose for patients with LR of PC.
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Abbreviations
- ADT:
-
Androgen deprivation therapy
- BCR:
-
Biochemical recurrence
- CT:
-
Computed tomography
- DCE:
-
Dynamic contrast-enhanced imaging
- DWI:
-
Diffusion-weighted imaging
- GS:
-
Gleason score
- LR:
-
Local recurrence
- MRI:
-
Magnetic resonance imaging
- mpMRI:
-
Multiparametric MRI
- PC:
-
Prostate cancer
- PET:
-
Positron emission tomography
- RP:
-
Radical prostatectomy
- RT:
-
Radiotherapy
- SUV:
-
Standard uptake value
- 68Ga:
-
Gallium-68
- PSMA:
-
Prostate-specific membrane antigen
- 18F-FECH:
-
Fluorethylcholine
- 18F-FDG:
-
2 − 18F-fluoro-2-deoxy-D-glucose
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Acknowledgements
We would like to express our gratitude to Dr. Stefan Kegel and the support of our technicians Regula Gnirs, Heike Streib-Retzbach, Julia Schliebus, Cora Weyrich, and Rene Hertel for their excellent support.
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There was no funding for this study.
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Heinz-Peter Schlemmer, Ali Afshar-Oromieh and Matthias C. Roethke have received honoraria from Siemens Healthcare for educational sessions. The other authors report no conflict of interest.
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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. Informed consent was obtained from all individual participants included in the study.
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Martin T. Freitag and Jan P. Radtke contributed equally to this work.
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Freitag, M.T., Radtke, J.P., Afshar-Oromieh, A. et al. Local recurrence of prostate cancer after radical prostatectomy is at risk to be missed in 68Ga-PSMA-11-PET of PET/CT and PET/MRI: comparison with mpMRI integrated in simultaneous PET/MRI. Eur J Nucl Med Mol Imaging 44, 776–787 (2017). https://doi.org/10.1007/s00259-016-3594-z
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DOI: https://doi.org/10.1007/s00259-016-3594-z