On October 15, 2025 Curium Group reported that together with PeptiDream Inc. and PDRadiopharma Inc., a registrational Phase 2 clinical trial has been initiated in Japan for 64Cu-PSMA-I&T – a PET radiopharmaceutical targeting prostate-specific membrane antigen (PSMA) expressed on prostate cancer cells.
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64Cu-PSMA-I&T is being assessed as a diagnostic PET imaging agent labeled with the radioisotope Copper-64, being developed with its therapeutic pair, 177Lu-PSMA-I&T. The development is conducted under the strategic collaboration between PDRadiopharma, a wholly owned subsidiary of PeptiDream, and Curium aiming at advancing innovative radiopharmaceuticals for prostate cancer in Japan.
The open-label, single-arm Phase 2 study will evaluate the sensitivity, specificity, and safety of 64Cu-PSMA-I&T. The trial will enroll approximately 70 patients who have been newly diagnosed with unfavorable intermediate, high or very high-risk prostate cancer and are scheduled for prostatectomy with pelvic lymph node dissection. This study is being conducted as a registrational trial in Japan and will utilize bridging data from Curium’s ongoing global clinical trials.
In parallel, a clinical trial for 177Lu-PSMA-I&T as a therapeutic agent is being planned to evaluate its efficacy and safety in patients with metastatic castration-resistant prostate cancer (mCRPC).
Renaud Dehareng, CEO of Curium Group commented: "Conducting these registrational trials, in partnership with PeptiDream and PDRadiopharma, marks a significant milestone in our mission to expand access to cutting-edge radiopharmaceuticals to patients with prostate cancer across Asia. By combining Curium’s global development expertise with PDRadiopharma’s deep local knowledge and infrastructure, we are well-positioned to deliver transformative solutions to prostate cancer patients in Japan."
Patrick C. Reid, President & CEO of PeptiDream commented: "Targeted radiopharmaceuticals are rapidly revolutionizing how we both diagnose and treat cancer. At PeptiDream and PDRadiopharma we are focused on expanding our pipeline of these targeted therapies, and we are thrilled to be able to accelerate those efforts by partnering with Curium to bring their prostate cancer targeting radiopharmaceuticals to patients in Japan."
About Prostate Cancer
Prostate cancer continues to be widely prevalent in Japan. Annually, there are approximately 90,000 – 100,000 new cases (*1), with patients with metastatic castration-resistant prostate cancer having an overall survival rate of approximately three years in clinical trial settings, and even shorter in the real-world, and there remains a significant unmet medical need for therapies.
*1: National Cancer Center Japan
Clinical trial progress
Phase 3 ECLIPSE trial – 177Lu-PSMA-I&T, a PSMA-targeting ligand conjugated with the radioisotope Lutetium-177, has been tested by Curium in a global pivotal Phase 3 ECLIPSE trial (ClinicalTrials.gov identifier; NCT05204927). It reported that the primary endpoint was met, demonstrating a statistically significant and clinically meaningful benefit for patients with mCRPC.
Phase 3 trial SOLAR RECUR and SOLAR STAGE – 64Cu-PSMA-I&T trials are being conducted to diagnose biochemical recurrence of prostate cancer (SOLAR RECUR trial, ClinicalTrials.gov identifier NCT06235099) and for men newly diagnosed with unfavorable intermediate to very high-risk prostate cancer, electing to undergo surgery (SOLAR STAGE trial, ClinicalTrials.gov identifier NCT06235151). The first in human Phase 1/2 SOLAR trial met the co-primary endpoints of region-level correct localization rate and patient-level correct detection rate in patients with histologically-proven metastatic prostate cancer.
Partnership Details
Under the terms of the partnership, Curium and PDRadiopharma will jointly collaborate on clinical development activities of 64Cu-PSMA-I&T and177Lu-PSMA-I&T and in Japan, with PDRadiopharma leading regulatory filing, manufacturing, commercialization, and distribution activities in Japan. Curium will continue to lead global development of the two agents and support PDRadiopharma through technology transfer to support the set-up of manufacturing lines in Japan – including a high throughput Copper 64 manufacturing line based on Curium’s proprietary technology.
(Press release, Curium Pharma, OCT 15, 2025, View Source [SID1234656636])