Abstract
Purpose
PET/CT using 68Ga-labelled prostate-specific membrane antigen PSMA-11 (HBEDD-CC) has emerged as a promising imaging method in the diagnostic evaluation of prostate cancer (PC) patients with biochemical recurrence. However, assessment of local recurrence (LR) may be limited by intense physiologic tracer accumulation in the urinary bladder on whole-body scans, normally conducted 60 min post-tracer injection (p.i.). It could be shown on early dynamic imaging studies that 68Ga-PSMA-11 uptake in PC lesions occurs earlier than tracer accumulation in the urinary bladder. This study aims to investigate whether early static PET acquisition increases detection rate of local recurrence on 68Ga-PSMA-11 PET/CT in comparison to PET imaging 60 min p.i..
Methods
203 consecutive PC patients with biochemical failure referred to 68Ga-PSMA-11 PET/CT were analysed retrospectively (median prostate specific antigen (PSA) value: 1.44 ng/ml). In addition to whole-body PET/CT scans 60 min p.i., early static imaging of the pelvis was performed, starting at a median time of 283 s p.i. (range: 243–491 s). Assessment was based on visual analysis and calculation of maximum standardized uptake value (SUVmax) of pathologic lesions present in the pelvic area found on early PET imaging and on 60 min-PET scans.
Results
26 patients (12.8%) were judged positive for LR on PET scans 60 min p.i. (median SUVmax: 10.8; range: 4.7–40.9), whereas 50 patients (24.6%) revealed a lesion suggestive of LR on early PET imaging (median SUVmax: 5.9; range: 2.9–17.6), resulting in a significant rise in detection rate (p < 0.001). Equivocal findings on PET scans 60 min p.i. decreased significantly with the help of early imaging (15.8% vs. 4.5% of patients; p < 0.001). Tracer activity in the urinary bladder with a median SUVmax of 8.2 was present in 63 patients on early PET scans (31.0%). However, acquisition starting time of early PET scans differed significantly in the patient groups with and without urinary bladder activity (median starting time of 321 vs. 275 s p.i.; range: 281–491 vs. 243–311 s p.i.; p < 0.001). Median SUVmax value of lesions suggestive of LR on early images was significantly higher in comparison to gluteal muscle, inguinal vessels and seminal vesicle/anastomosis (median SUVmax: 5.9 vs. 1.9, 4.0 and 2.4, respectively).
Conclusions
Performance of early imaging in 68Ga-PSMA-11 PET/CT in addition to whole-body scans 60 min p.i. increases the detection rate of local recurrence in PC patients with biochemical recurrence. Acquisition of early PET images should be started as early as 5 min p.i. in order to avoid disturbing tracer activity in the urinary bladder occuring at a later time point.
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We want to express our gratitude to all the members of our PET staff for their contribution in performing this study.
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All procedures performed in this study were in accordance with the ethical standards of the institutional and national research committee and with the principles of the 1964 Declaration of Helsinki and its subsequent amendments [36]. All patients of whom data was published in this manuscript signed a written informed consent.
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Uprimny, C., Kroiss, A.S., Fritz, J. et al. Early PET imaging with [68]Ga-PSMA-11 increases the detection rate of local recurrence in prostate cancer patients with biochemical recurrence. Eur J Nucl Med Mol Imaging 44, 1647–1655 (2017). https://doi.org/10.1007/s00259-017-3743-z
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DOI: https://doi.org/10.1007/s00259-017-3743-z