Masatoshi Hotta1, Andrei Gafita1, Johannes Czernin1, Jeremie Calais2. 1. Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, California. 2. Ahmanson Translational Theranostics Division, Department of Molecular and Medical Pharmacology, UCLA, Los Angeles, California jcalais@mednet.ucla.edu.
Abstract
The aim of the study was to assess the outcome of patients with metastatic castration-resistant prostate cancer treated with 177Lu-prostate-specific membrane antigen (PSMA) who would have been a screen failure (SF) in the VISION trial based on PSMA PET/CT criteria. Methods: We conducted a retrospective multicenter cohort study on 301 patients with metastatic castration-resistant prostate cancer treated with 177Lu-PSMA. The patients were classified into eligible (VISION-PET-E) and SF (VISION-PET-SF) groups on the basis of the baseline PSMA PET/CT results. Prostate-specific antigen (PSA) response rates, PSA progression-free survival, and overall survival were compared. Results: Of 301 patients, 272 (90.4%) and 29 (9.6%) were VISION-PET-E and VISION-PET-SF, respectively. The VISION-PET-SF patients had a worse rate of ≥50% PSA decline (21% vs. 50%, P = 0.005) and PSA progression-free survival (2.1 vs. 4.1 mo, P = 0.023) and tended to have a shorter overall survival (9.6 vs. 14.2 mo. P = 0.16) than the VISION-PET-E patients. Conclusion: The VISION-PET-SF patients had worse outcomes than the VISION-PET-E patients. Our cohort did not include preexcluded patients (10%-15%) by local site assessments. Thus, 20%-25% of the patients may be SFs in unselected populations. Refinements in patient selection for 177Lu-PSMA are needed to optimize outcomes.
The aim of the study was to assess the outcome of patients with metastatic castration-resistant prostate cancer treated with 177Lu-prostate-specific membrane antigen (PSMA) who would have been a screen failure (SF) in the VISION trial based on PSMA PET/CT criteria. Methods: We conducted a retrospective multicenter cohort study on 301 patients with metastatic castration-resistant prostate cancer treated with 177Lu-PSMA. The patients were classified into eligible (VISION-PET-E) and SF (VISION-PET-SF) groups on the basis of the baseline PSMA PET/CT results. Prostate-specific antigen (PSA) response rates, PSA progression-free survival, and overall survival were compared. Results: Of 301 patients, 272 (90.4%) and 29 (9.6%) were VISION-PET-E and VISION-PET-SF, respectively. The VISION-PET-SF patients had a worse rate of ≥50% PSA decline (21% vs. 50%, P = 0.005) and PSA progression-free survival (2.1 vs. 4.1 mo, P = 0.023) and tended to have a shorter overall survival (9.6 vs. 14.2 mo. P = 0.16) than the VISION-PET-E patients. Conclusion: The VISION-PET-SF patients had worse outcomes than the VISION-PET-E patients. Our cohort did not include preexcluded patients (10%-15%) by local site assessments. Thus, 20%-25% of the patients may be SFs in unselected populations. Refinements in patient selection for 177Lu-PSMA are needed to optimize outcomes.