A First-in-human, Open-label, Phase 1 Study to Evaluate the Safety, Antitumor Activity, Pharmacokinetics, and Pharmacodynamics of Subcutaneous SAR446523, an Anti-GPRC5D ADCC-enhanced Monoclonal Antibody, in Participants With Relapsed/Refractory Multiple Myeloma
This is a first-in-human study of SAR446523 conducted in patients with RRMM. The study consists of two parts: Dose escalation (Part A): In this part, up to 6 dose levels (DLs) of SAR446523 will be explored to determine the maximum administered dose (MAD), maximum tolerated dose (MTD), and recommended dose range (RDR) of 2 dose regimens which will be tested in the dose optimization part. Dose optimization (Part B): In this part, participants will be randomly assigned in a 1:1 ratio using interactive response technology (IRT) to either one of the chosen dose regimens of SAR446523 (determined from data coming from Part A), to determine the optimal dose as the recommended phase 2 dose (RP2D) of SAR446523.
• Participants with a documented diagnosis of multiple myeloma (MM) with measurable disease.
• Contraceptive use by men and women should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies.
⁃ Dose escalation (Part A)
• Participants must have received at least 3 prior lines of antimyeloma therapy, and must be either relapsed or refractory to the above therapies, or are intolerant to them.
• Note: In Part A, prior exposure to anti g-protein-coupled receptor, class c, group 5, member d (GPRC5D) therapy and anti B-cell maturation antigen (BCMA) therapy is allowed.
⁃ Dose optimization (Part B)
• Participants must have received at least 3 prior lines of antimyeloma therapy and be either relapsed or refractory to immunomodulator (IMiD), proteasome inhibitor (PI), anti CD38 monoclonal antibody (mAb), and anti BCMA targeting agent or are intolerant to them.
• Note: In Part B, prior exposure to antiGPRC5D therapy is not allowed.