• A Registrational Phase 2 clinical trial has been initiated in Japan for patients with PSMA-positive metastatic castration-resistant prostate cancer (mCRPC).
   

BOSTON, Feb. 04, 2026 (GLOBE NEWSWIRE) -- Curium Group today announced that together with PeptiDream Inc. and PDRadiopharma Inc., the first patient has been dosed in the companies' registrational clinical trial of 177Lu-PSMA-I&T in Japan for patients with PSMA (*1)-positive metastatic castration-resistant prostate cancer (mCRPC).

177Lu-PSMA-I&T is a radiotherapeutic agent targeting PSMA conjugated to a chelator radiolabeled with Lutetium-177. The multicenter, open-label, single-arm registrational Phase 2 trial will evaluate efficacy and safety of 177Lu-PSMA-I&T. The trial will enroll patients who have been diagnosed with mCRPC and will be conducted as a registrational trial in Japan, utilizing the bridging data from Curium's ongoing global clinical trials under the strategic collaboration between PDRadiopharma and Curium.

As announced on 15 October 2025, Curium Group, PeptiDream and PDRadiopharma initiated the clinical trial of 64Cu-PSMA-I&T which is being assessed as a diagnostic PET imaging agent with patients who have been newly diagnosed with prostate cancer (please refer to “PeptiDream, PDRadiopharma and Curium Group Enroll First Patient to Registrational Clinical Trial of 64Cu-PSMA-I&T for Prostate Cancer in Japan”). 64Cu-PSMA-I&T is also used in this trial to confirm PSMA positivity before the administration of 177Lu-PSMA-I&T.

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 patients with prostate cancer in Japan.”

Masato Murakami, President of PDRadiopharma & CMO of PeptiDream commented: "We are excited to initiate the development of 177Lu-PSMA-I&T in Japan. Introducing new treatment options is an important part of improving prostate cancer patient care. Together with 64Cu-PSMA-I&T, this program is expected to provide new options to visualize and treat prostate cancer more precisely, helping patients and their physicians make more informed decisions. In collaboration with Curium, PDRadiopharma is committed to bringing these radiopharmaceutical treatments to patients in Japan as safely and as quickly as possible."

About Prostate Cancer

Prostate cancer continues to be widely prevalent in Japan. Annually, there are approximately 90,000 – 100,000 new cases (*2), 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: PSMA - prostate-specific membrane antigen which is highly expressed on prostate cancer cells

*2: 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 177Lu-PSMA-I&T and 64Cu-PSMA-I&T 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.

About Curium

Curium Pharma is a leading global radiopharmaceutical company with proven expertise in the development, manufacturing and supply of radiopharmaceuticals that transform the way cancer is diagnosed and treated. Headquartered in Boston with offices around the world, Curium's mission is to find new and better ways to diagnose and treat cancer.

With a global footprint that extends to more than 70 countries, a skilled and dedicated team of over 5,000 employees, and four manufacturing sites, Curium is uniquely qualified to meet the significant supply and distribution of established products that underlie success in the radiopharmaceuticals market. Curium's global leadership is embodied in a diverse and extensive portfolio of over 45 products, that advance patient care for a wide range of cancers.

Curium's pioneering legacy in nuclear medicine is the foundation of the company's dedication to innovation and portfolio expansion to cancer therapeutics, particularly in neuroendocrine tumors and with a late-stage pipeline exploring opportunities in prostate cancer.

To learn more, visit www.curiumpharma.com.

About PeptiDream Inc.

PeptiDream Inc. (Tokyo Stock Exchange Prime Section 4587) is leading the translation of macrocyclic peptides into a whole new class of innovative medicines to address unmet medical needs and improve the quality of life of patients worldwide. In its radiopharmaceutical business, through its wholly-owned subsidiary PDRadiopharma, PeptiDream markets and sells a number of approved radiopharmaceuticals and radiodiagnostics in Japan, as well as leveraging its proprietary Peptide Discovery Platform System (PDPS) technology to discover and develop a deep pipeline of innovative targeted radiotherapeutics and radiodiagnostics, spanning both wholly-owned internal programs and globally partnered programs. In its non-radiopharmaceutical business, PeptiDream is similarly leveraging PDPS to discover and develop a broad and diverse pipeline of investigational peptide therapeutics, peptide drug conjugates (PDC) and multi-functional peptide conjugates (MPC) across an extensive global network of discovery and development partners. PeptiDream is headquartered in Kawasaki, Japan. For more information about our company, science and pipeline, please visit www.peptidream.com/en/

About PDRadiopharma

PDRadiopharma, a wholly-owned subsidiary of PeptiDream from 2022, has been providing high-quality radiopharmaceuticals through the research and development, manufacturing, regulatory and sales as a forerunner in the field in radiopharmaceuticals, since it started its business in 1968. PDRadiopharma currently markets 22 radiodiagnostic products (spanning both SPECT and PET products) and 8 radiotherapeutic products (3 product categories) in Japan. Additionally, PDRadiopharma and PeptiDream are developing a broad pipeline of radiotherapeutics and radiodiagnostics for both the Japan and global markets. For more information about PDRadiopharma, please visit www.pdradiopharma.com/en/

Inquiries:

Curium
Camilla Campbell
VP, Head of Global Communications
communications@curiumpharma.com

PeptiDream Inc.
Contact: Yuko Okimoto, IR & Public Affairs
Email: info@peptidream.com
Website: https://www.peptidream.com/en/
X: https://x.com/PeptidreamInc

PDRadiopharma Inc.
Contact: Noriko Tanaka, General Affairs
Email: s-info-hq@pdradiopharma.com