Assessment of volumetric parameters derived from 68Ga-PSMA PET/CT in prostate cancer patients with biochemical recurrence: an institutional experience. Issue 11 (19th July 2021)

• Record Type: Journal Article
• Authors: Okudan, Berna; Coşkun, Nazim; Seven, Bedri; Atalay, Merve Ağcioğlu; Yildirim, Aslihan; Görtan, Fatma Arzu
• Is Part Of: Nuclear medicine communications. Volume 42:Issue 11(2021)
• Page Start: 1254
• Page End: 1260
• Publication Date: 2021-07-19
• Subjects: 68Ga-PSMA -- PET/CT -- prostate cancer -- PSA -- volumetric parameters; Nuclear medicine -- Periodicals; 616.07575
• DOI: 10.1097/MNM.0000000000001459
• Languages: English
• ISSNs: 0143-3636

Abstract

Abstract : Objective: The aim of this study was to evaluate the relationship between volumetric parameters calculated using semiautomatic quantification of lesions detected in 68Ga-labeled prostate-specific membrane antigen PET-computed tomography (68Ga-PSMA PET/CT) and clinical characteristics in prostate cancer (PCa) patients with biochemical recurrence. Methods: A total of 85 consecutive PCa patients with biochemical recurrence who underwent 68Ga-PSMA PET/CT at our institution from January 2019 to March 2020 were retrospectively assessed. 68Ga-PSMA PET/CT-derived volumetric parameters, including whole-body PSMA tumor volume (wbPSMA-TV) and whole-body total lesion PSMA (wbTL-PSMA), as well as the established maximum and mean standardized uptake value (SUVmax and SUVmean), were calculated for each patient. All PET-derived parameters were analyzed for correlation with prostate-specific antigen (PSA) levels and for association with Gleason scores. Results: Eighty-five patients with a mean age of 68.9 ± 7.8 years (range, 47–83 years) and a mean PSA level of 40.9 ± 92.1 ng/ml (range, 0.2–533.2 ng/ml) were analyzed. Volumetric parameters, that is, wbPSMA-TV and wbTL-PSMA, demonstrated a statistically significant correlation with PSA levels ( r = 0.403 and r = 0.556, respectively, all at P < 0.001) and only the means of wbTL-PSMA were significantly different between the Gleason score groups ( P < 0.05). Conclusions: The results of our study indicate that 68Ga-PSMA PET/CT might be a valuable tool for the detection and follow-up of recurrence in PCa patients. 68Ga-PSMA PET/CT-derived quantitative volumetric parameters demonstrated a highly significant correlation with changes in PSA levels. Larger prospective studies are needed to help reveal the full potential of parameters such as PSMA-TV and TL-PSMA derived from PET imaging with 68Ga-PSMA.