You have accessJournal of UrologyProstate Cancer: Localized: Surgical Therapy IV (PD57)1 Sep 2021PD57-11 IDENTIFICATION OF THE BEST CANDIDATES FOR PSMA PET/CT AMONG PATIENTS EXPERIENCING BIOCHEMICAL RECURRENCE AFTER RADICAL PROSTATECTOMY Giorgio Gandaglia, Daniele Robesti, Nicola Fossati, Giuseppe Rosiello, Francesco Barletta, Elio Mazzone, Simone Scuderi, Vito Cucchiara, Umberto Capitanio, Andrea Necchi, Andrea Salonia Milan, Italy, Pierre I Karakiewicz, Montreal, Canada, Francesco Montorsi, and Alberto Briganti Giorgio GandagliaGiorgio Gandaglia More articles by this author , Daniele RobestiDaniele Robesti More articles by this author , Nicola FossatiNicola Fossati More articles by this author , Giuseppe RosielloGiuseppe Rosiello More articles by this author , Francesco BarlettaFrancesco Barletta More articles by this author , Elio MazzoneElio Mazzone More articles by this author , Simone ScuderiSimone Scuderi More articles by this author , Vito CucchiaraVito Cucchiara More articles by this author , Umberto CapitanioUmberto Capitanio More articles by this author , Andrea NecchiAndrea Necchi More articles by this author , Andrea Salonia Milan, ItalyAndrea Salonia Milan, Italy More articles by this author , Pierre I Karakiewicz, Montreal, CanadaPierre I Karakiewicz, Montreal, Canada More articles by this author , Francesco MontorsiFrancesco Montorsi More articles by this author , and Alberto BrigantiAlberto Briganti More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000002091.11AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: Although PSMA PET/CT is recommended in the biochemical recurrence (BCR) setting after radical prostatectomy (RP), its impact on clinical management is unclear. This is particularly true when considering prostate cancer (PCa) patients at low risk of metastases who could be managed with salvage radiotherapy (sRT) alone. We aimed at assessing when PSMA PET/CT could be safely avoided or postponed METHODS: 182 patients evaluated with PSMA PET/CT for BCR after RP between 2016 and 2020 were evaluated. The outcome was a distant metastasis (i.e., retroperitoneal, skeletal or visceral) at PSMA PET/CT. Multivariable logistic regression analyses assessed predictors of distant spots (i.e., pathological stage, grade group, sRT and ADT). The model based on the regression coefficients was internally validated. An interaction analysis tested whether the association between PSA at PET/CT and distant spots varied according to the risk calculated using the model. Patients were stratified according to the model-derived risk (<30 vs. ≥30%) and the rate of distant spots at PET/CT was plotted against PSA values RESULTS: Median PSA at PET/CT scan was 0.7 ng/ml. Overall, 76 (41.5%) and 57 (31.1%) had grade group 4-5 and seminal vesicle invasion (SVI). Overall, 60 (32.8%) and 24 (13.1%) patients received sRT and ADT before PSMA PET/CT. Overall, 59 (32.2%) patients had distant spots at PSMA PET/CT. Concomitant ADT (Hazard Ratio [HR]: 5.5; p=0.02), SVI (HR:3.5; p=0.005) and grade group 4-5 (HR:3.7; p=0.01) predicted distant spots at PET/CT (AUC: 80%). The rate of distant positive spots in men with grade group 1-3, no SVI and no ADT (n=34, 18.6%) was 12%. This increased to 41% in patients with adverse factors (p<0.001). The impact of PSA values at PSMA PET/CT varied according to the novel risk score (p=0.03 by interaction test). While in men with a calculated risk <30% increasing PSA values at PSMA PET/CT did not impact on the risk of distant metastases at PSMA PET/CT, in those with worse characteristics it increased according to PSA levels. CONCLUSIONS: The use of PSMA PET/CT can be safely avoided or postponed in individuals with grade group 1-3, no SVI and who did not receive previous salvage therapies. These patients can be considered candidates to sRT without a previous PSMA PET/CT. Source of Funding: None © 2021 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 206Issue Supplement 3September 2021Page: e1014-e1014 Advertisement Copyright & Permissions© 2021 by American Urological Association Education and Research, Inc.MetricsAuthor Information Giorgio Gandaglia More articles by this author Daniele Robesti More articles by this author Nicola Fossati More articles by this author Giuseppe Rosiello More articles by this author Francesco Barletta More articles by this author Elio Mazzone More articles by this author Simone Scuderi More articles by this author Vito Cucchiara More articles by this author Umberto Capitanio More articles by this author Andrea Necchi More articles by this author Andrea Salonia Milan, Italy More articles by this author Pierre I Karakiewicz, Montreal, Canada More articles by this author Francesco Montorsi More articles by this author Alberto Briganti More articles by this author Expand All Advertisement Loading ...