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[ 177 Lu]Lu-PSMA-617 Versus Docetaxel in Chemotherapy-Naïve Metastatic Castration-Resistant Prostate Cancer: Final Survival Analysis of a Phase 2 Randomized, Controlled Trial.

Journal of Nuclear Medicine 2023 September 15
The prostate-specific membrane antigen (PSMA) inhibitor [177 Lu]Lu-PSMA-617 has been previously demonstrated to be noninferior to docetaxel in achieving a biochemical response in chemotherapy-naïve metastatic castration-resistant prostate cancer patients. Here, we report the final analysis of overall survival (OS) for a phase 2 randomized, controlled trial. Methods: Forty chemotherapy-naïve, PSMA-positive metastatic castration-resistant prostate cancer patients were randomly assigned to [177 Lu]Lu-PSMA-617 ( n = 20) or docetaxel ( n = 20). Thirty-five patients received treatment per the protocol. Survival analysis was done using Kaplan-Meier curves and the Cox regression model. Results: The mean follow-up duration was 33.4 mo. In intention-to-treat analysis, the median OS for the [177 Lu]Lu-PSMA-617 and docetaxel arms was 15.0 mo (95% CI, 9.5-20.5 mo) and 15.0 mo (95% CI, 8.1-21.9 mo), respectively ( P = 0.905). In per-protocol analysis, the median OS was 19.0 mo (95% CI, 12.3-25.7 mo) versus 15.0 mo (95% CI, 8.1-21.9 mo), respectively ( P = 0.712). No significant difference in OS was observed between the 2 arms across the analyzed subgroups. Conclusion: Long-term outcomes with [177 Lu]Lu-PSMA-617 administered earlier in the prechemotherapy setting are comparable to those with docetaxel.

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