Simcere Zaiming, an innovative oncology-focused subsidiary of Simcere Pharmaceutical Group announced the first US patient has started treatment in the ongoing Phase 1 trial (SIM0500-101, NCT06375044) at The Tisch Cancer Institute at the Icahn School of Medicine at Mount Sinai, evaluating safety, tolerability, pharmacokinetics and preliminary efficacy of SIM0500 in patients with relapsed/refractory multiple myeloma (RRMM).

SIM0500 (formerly SCR-8572) is a humanized trispecific antibody targeting GPRC5D, BCMA and CD3, developed using Simcere Zaiming's proprietary T-cell engager polyspecific antibody platform. ^[1] "In the last few years, BCMA and GPRC5D-targeted therapies have demonstrated significant promise in treating RRMM and have been anticipated as the cornerstones of the next chapter in the pursuit of curing myeloma. SIM0500 is the natural evolution of combining these targets with the aim to optimize outcomes in the RRMM," said Dr. Joshua Richter, M.D., Associate Professor of Medicine at the Icahn School of Medicine at Mount Sinai, Director of Multiple Myeloma at the Blavatnik Family Chelsea Medical Center at Mount Sinai, and Principal Investigator.

"SIM0500 is designed to bind to two tumor antigens, GPRC5D and BCMA. It has shown strong T-cell cytotoxicity against multiple myeloma cells in preclinical studies," said Prof. Shaji Kumar, M.D. "I look forward to participating in the Phase 1 study of SIM0500 to evaluate the safety and efficacy of this potentially transformative therapy in patients with RRMM."

"We are quite pleased with the safety and encouraging efficacy results generated to-date in the ongoing dose escalation and look forward to the extension of the SIM0500 Phase 1 trial to the US. This marks an important step forward in Simcere Zaiming's continued commitment to advance new oncology treatments and elevate the standard of care for patients with RRMM," said Yongyu Wang, M.D., Chief Medical Officer, Simcere Zaiming.

SIM0500 is being developed in partnership with AbbVie.