[177Lu]Lu-PSMA-617 (177Lu-PSMA-617) plus the standard of care (SoC) significantly improved overall survival and radiographic progression-free survival versus SoC alone in patients with prostate-specific membrane antigen (PSMA)-positive metastatic castration-resistant prostate cancer in the VISION trial. We evaluated the safety of additional cycles of 177Lu-PSMA-617 and the impact of longer observation time for patients receiving 177Lu-PSMA-617 plus SoC.
VISION was an international, open-label study. Patients were randomised 2:1 to receive 177Lu-PSMA-617 plus SoC or SoC alone. The incidence of treatment-emergent adverse events (TEAEs) was assessed in prespecified subgroups of patients who received ≤4 cycles versus 5-6 cycles of treatment and during each cycle of treatment. The TEAE incidence was also adjusted for treatment exposure to calculate the incidence per 100 patient-treatment years of observation. This analysis was performed for the first occurrence of TEAEs.
The any-grade TEAE incidence was similar in cycles 1-4 and cycles 5-6. TEAE frequency was similar across all cycles of 177Lu-PSMA-617 treatment. No additional safety concerns were reported for patients who received >4 cycles. The exposure-adjusted safety analysis revealed that the overall TEAE incidence was similar between arms, but distinct trends for different TEAE types were noted and the incidence of events associated with 177Lu-PSMA-617 remained higher in the 177Lu-PSMA-617 arm.
Longer exposure to 177Lu-PSMA-617 plus SoC was not associated with a higher toxicity risk, and the extended time for safety observation could account for the higher TEAE incidence in comparison to SoC alone. The findings support a favourable benefit-risk profile for 6 cycles of 177Lu-PSMA-617 in this setting and the use of up to 6 cycles of 177Lu-PSMA-617 in patients who are clinically benefiting from and tolerating this therapy.
For patients with metastatic prostate cancer no longer responding to hormone therapy, an increase in the number of cycles of treatment with a radioactive compound called 177Lu-PSMA-617 from four to six had no additional adverse side effects.
European urology. 2024 Jan 06 [Epub ahead of print]
Kim N Chi, Andrew J Armstrong, Bernd J Krause, Ken Herrmann, Kambiz Rahbar, Johann S de Bono, Nabil Adra, Rohan Garje, Jeff M Michalski, Mette M Kempel, Karim Fizazi, Michael J Morris, Oliver Sartor, Marcia Brackman, Michelle DeSilvio, Celine Wilke, Geoffrey Holder, Scott T Tagawa
British Columbia Cancer, Vancouver Prostate Centre, Vancouver, Canada. Electronic address: ., Duke Cancer Institute Center for Prostate & Urologic Cancers, Duke University, Durham, NC, USA., Department of Nuclear Medicine, Rostock University Medical Center, Rostock, Germany., Department of Nuclear Medicine, University of Duisburg-Essen, Essen, Germany; German Cancer Consortium (DKTK), University Hospital Essen, Essen, Germany., Department of Nuclear Medicine, University Hospital Münster, Münster, Germany., Division of Clinical Studies, The Institute of Cancer Research and The Royal Marsden Hospital, London, UK., Indiana University Melvin and Bren Simon Comprehensive Cancer Center, Indianapolis, IN, USA., Miami Cancer Institute, Baptist Health South Florida, Miami, FL, USA., Department of Radiation Oncology, Washington University, St. Louis, MO, USA., Department of Oncology and Clinical Cancer Research Center, Aalborg University Hospital, Aalborg, Denmark., Department of Cancer Medicine, Institut Gustave Roussy, University of Paris-Saclay, Villejuif, France., Genitourinary Oncology Service, Memorial Sloan Kettering Cancer Center, New York, NY, USA., Tulane Cancer Center, Tulane University School of Medicine, New Orleans, LA, USA., Novartis Pharmaceuticals Corporation, Indianapolis, IN, USA., Novartis Pharmaceuticals Corporation, East Hanover, NJ, USA., Novartis Pharma AG, Basel, Switzerland., Hematology and Medical Oncology Department, Weill Cornell Medicine, New York, NY, USA.