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- W3171415090 abstract "1315 Objectives: The use of quantitative imaging biomarkers are becoming a promising technique to allow tumor load quantification. For 18F-FDG-PET/CT, such concepts already exist, for example, the whole-body tumor burden has been shown to correlate directly with tumor aggressiveness of several tumors. The concept of whole-body tumor burden in patients with prostate cancer has only been assessed with 68Ga-PSMA PET/CT. Recently the development of 18F labeled PSMA compounds, has been shown to offer higher detection rates in biochemically recurrent prostate cancer after primary therapy. Therefore, we aim to evaluate if 18F-PSMA-1007 ligand PET/CT may provide PSMA-derived volumetric parameters for quantification of whole-body tumor burden. Methods: This retrospective study evaluated 101 patients referred for 18F-PSMA-1007 PET/CT with biochemical recurrence or PSA persistence after radical prostatectomy. The PSMA whole-body tumor burden metrics on 18F-PSMA-1007 were obtained semiautomatically in a dedicated software, all uptakes not related to metastatic sites were excluded. The software automatically generated the total tumor volume (PSMA-TV) and the total PSMA uptake in lesions (PSMA-TL). Descriptive statistics are absolute and relative frequencies, mean, median, standard deviation, and range were used to characterize the study population. Spearman correlation was used to explore the association of imaging findings with PSA levels. A subgroup analysis was performed dividing the data into three groups, depending on their Gleason scores <6, 7 -8, and 9-10, statistical significance was established for P values of 0.05 or less. Results: Among the 101 PSMA PET studies, a total of 501 metastatic lesions were analyzed, a significant correlation was observed with wbPSMA-TV (r=0.533, P<0.0001) and wbPSMA-TL (r= 0.654, P<0.0001). In the subgroup analysis, there was a significant correlation in the three Gleason groups. However, wbTL-PSMA and PSA were strongly correlated especially in the group of patients with Gleason score <6 (r=0.78, p=0.0001, 95% CI 0.60-90). Conclusions: The results of our study show that 18F-PSMA-1007 volumetric parameters demonstrate a highly significant correlation with serum-PSA levels, especially wbPSMA-TL. The use of volumetric parameters could be a potential imaging biomarker for whole-body tumor assessment, capable of standardizing quantitative changes in PET imaging in patients with biochemically recurrent prostate cancer.Acknowledgments: We acknowledge the contributions of all team members from the PET/CT Unit from the National Autonomous University of Mexico." @default.
- W3171415090 created "2021-06-22" @default.
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- W3171415090 date "2021-05-01" @default.
- W3171415090 modified "2023-09-30" @default.
- W3171415090 title "Initial experience with volumetric 18F-PSMA-1007 PET/CT for assessment of whole-body tumor burden as a quantitative imaging biomarker in biochemically recurrent prostate cancer" @default.
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