Abstract
Purpose
The aim of this study was to assess the accuracy and clinical impact of [11C]choline PET/CT for localizing occult relapse of prostate adenocarcinoma after radical prostatectomy.
Methods
Fourty-nine patients with prostate adenocarcinoma, radical prostatectomy, no evidence of metastatic disease, and occult relapse underwent [11C]choline PET/CT. Thirty-six of the patients had biochemical evidence and histological evaluation of local recurrence. Thirteen patients had PSA < 0.3 ng/ml and no evidence of active disease after 1 year follow-up. Focal nodular [11C]choline uptake in the prostatic fossa was visually assessed and graded on a five point scale. Maximum standardized radioactivity uptake value (SUVmax) and the lesion size were measured. A receiver operating characteristic (ROC) analysis was performed and the clinical impact of the PET/CT study was determined.
Results
[11C]choline PET/CT was true positive in 23/33 patients and true negative in 12/13 controls. SUVmax of local recurrence was 3.0 (median, range 0.6–7.4) and 1.1 (0.4–1.6) in controls (p = 0.0002). Lesion size was 1.7 cm (range 0.9–3.7). Area under the ROC curve for detecting relapse was 0.90 ± 0.05 and 0.83 ± 0.06 for visual evaluation and SUVmax, respectively. Sensitivity and specificity of [11C]choline PET/CT were 0.73 and 0.88, respectively. [11C]choline PET/CT identified 12/17 (71%) patients with a favourable biochemical response to local radiotherapy at 2 year (median, 0.8–3.2 range) follow-up.
Conclusions
Focally increased [11C]choline uptake in the prostatic bed reliably predicted local low volume occult relapsing prostate adenocarcinoma after radical prostatectomy and identified 71% of patients with a favourable biochemical response to local radiotherapy.
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Reske, S.N., Blumstein, N.M. & Glatting, G. [11C]choline PET/CT imaging in occult local relapse of prostate cancer after radical prostatectomy. Eur J Nucl Med Mol Imaging 35, 9–17 (2008). https://doi.org/10.1007/s00259-007-0530-2
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DOI: https://doi.org/10.1007/s00259-007-0530-2