On October 8, 2025 Sanofi reported positive results from the ALPHAMEDIX-02 phase 2 study (clinical study identifier: NCT05153772) showed AlphaMedixTM (212Pb-DOTAMTATE), an investigational somatostatin receptor (SSTR)-Targeted Alpha Therapy using the lead-212 isotope, met all primary efficacy endpoints and showed clinically meaningful overall response rates (ORR) and prolonged clinical benefits in both peptide receptor radionuclide therapy (PRRT)-naïve and PRRT-exposed patients with unresectable or metastatic SSTR positive gastroenteropancreatic neuroendocrine tumors (GEP-NETs). Benefits in key secondary endpoints, including progression-free survival (PFS) and overall survival (OS), were also observed across both cohorts. AlphaMedix had a manageable safety profile that was similar across both cohorts.
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"The positive results from the ALPHAMEDIX-02 study represent a pivotal movement for the Orano Med 212Pb-based platform and underscore the profound potential of lead-212-based radiopharmaceuticals in addressing critical unmet needs for patients with GEP-NETs. We are very encouraged by AlphaMedix’s consistent and clinically meaningful activity across both peptide receptor radionuclide therapy (PRRT)-naïve and PRRT-exposed patients," said Volker Wagner, MD, PhD, Chief Medical Officer at Orano Med. "These data reinforce our belief that delivering highly potent alpha-emitters directly to cancer cells could potentially offer a meaningful new treatment option for people living with GEP-NETs."
Alpha-emitters are being studied to determine their relative potency and targeted tumor activity compared to current approved therapies. It is believed they could potentially reduce exposure of surrounding healthy tissue due to the short range of alpha particles. In February 2024, AlphaMedix was granted Breakthrough Therapy Designation by the US Food and Drug Administration (FDA) for treatment of PRRT-naïve patients with unresectable or metastatic, progressive SSTR-expressing GEP-NETs, recognizing the potential clinical benefits and potential of this lead-212–based therapy.
"The promising ALPHAMEDIX-02 results represent a significant step forward, reinforcing the potential of targeted alpha therapy to deliver precise treatment for GEP-NETs," said Christopher Corsico, MD, Global Head of Development at Sanofi. "These data, demonstrating clinically meaningful activity and a manageable safety profile, underscore our unrelenting commitment to developing innovative therapies for patients with difficult-to-treat cancers. We look forward to advancing AlphaMedix and working with Orano Med and regulators to bring this important treatment to the GEP-NET community as soon as possible."
The study is ongoing, and the full results will be presented at the 2025 European Society for Medical Oncology (ESMO) (Free ESMO Whitepaper) Congress. The results will also form the basis of discussions with health authorities. AlphaMedix has not been approved by any regulatory authority.
About the ALPHAMEDIX-02 study
ALPHAMEDIX-02 is a phase 2, open-label, multicenter study evaluating the efficacy and safety of AlphaMedix (212Pb-DOTAMTATE) in patients with histologically confirmed unresectable or metastatic GEP-NETs, positive somatostatin analogue imaging and at least one site of measurable disease. The study included two cohorts evaluating PRRT-naïve (n=35) and PRRT-exposed (n=26) patients. PRRT-exposed patients had progressive disease after receiving up to four doses of 177Lu-DOTATATE and received their last dose at least six months prior to Day 1. In both cohorts, AlphaMedix was administered at 67.6 µCi/kg every eight weeks for up to four cycles (6 mCi maximum per cycle). Primary endpoints included ORR per RECIST1.1 and safety. Secondary endpoints included PFS and OS.
About NETs
NETs are a heterogeneous group of cancers that originate from neuroendocrine cells. These cancers occur mostly in the gastrointestinal tract and pancreas but can also occur in other tissues including the thymus, lung, and other uncommon sites such as the ovaries, heart, and prostate. Most NETs strongly express somatostatin receptors. Despite the global prevalence of NETs increasing each year, it is considered a rare cancer that is estimated to affect approximately 35/100,000 individuals worldwide. In the United States, around 12,000 patients annually are expected to be diagnosed with neuroendocrine tumors, with an average five-year survival rate of 60% at a metastatic stage.
(Press release, Sanofi, OCT 8, 2025, View Source [SID1234656678])