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    Isatuximab in combination with lenalidomide and dexamethasone in patients with high-risk smoldering multiple myeloma: Updated safety run-in results from the randomized phase 3 ithaca study
    (American Society of Hematology, 2022) Mateos, Maria-Victoria; Rodriguez Otero, Paula; Koh, Youngil; Martinez-Lopez, Joaquin; Parmar, Gurdeep; Prince, H. Miles; Quach, Hang; Ribas, Paz; Hermansen, Emil; Hungria, Vania T. M.; Kalayoğlu Beşışık, Sevgi; Kim, Jin Seok; Leleu, Xavier; Peceliunas, Valdas; Schjesvold, Fredrik; Sevindik, Ömür Gökmen; Lavrova, Tatiana; Dubin, Franck; Devisme, Christine; Lepine, Lucie; Ghobrial, Irene
    Background: Results from a randomized, Phase 3 study by the Spanish Myeloma Group (PETHEMA/GEM) previously showed that treatment with lenalidomide plus dexamethasone (Rd) may delay progression to active disease in patients (pts) with high-risk smoldering multiple myeloma (SMM), compared with observation. To further improve outcomes, addition of the anti-CD38 antibody isatuximab (Isa) to lenalidomide and dexamethasone (Isa-Rd) for the treatment of pts with high-risk SMM is being evaluated in the ongoing, randomized, multi-center, Phase 3 ITHACA study (NCT04270409). Initial findings from the safety run-in analysis of this trial have shown a manageable safety profile and encouraging, preliminary anti-myeloma activity. We now report updated safety and efficacy results from the safety run-in part of ITHACA at a median follow-up of 19.4 months. Methods: Pts were included in the study if they had been diagnosed within 5 years with SMM (per the International Myeloma Working Group [IMWG] criteria) and had high-risk SMM according to the Mayo '20-2-20' and/or updated PETHEMA model criteria. Pts who had received prior anti-myeloma treatment were not eligible. Enrolled pts received Isa 10 mg/kg IV on day (D) 1, 8, 15, and 22 in cycle (C) 1, D1 and D15 C2-12, D1 C13-36; plus R D1-21 (25 mg C1-9; 10 mg C10-24) and d weekly (40 mg, 20 mg for ?75 yr-old pts C1-9; 20 mg C10-24). Cycle duration was 28 days. Safety evaluations included treatment-emergent AEs (TEAEs)/serious AEs and laboratory parameters, graded by NCI-CTCAE v5.0. Response was determined by IMWG criteria (2016). Mandatory imaging by MRI and/or low-dose whole-body CT/PET-CT, and assessments of minimal residual disease (MRD, by next-generation sequencing in pts with very good partial response [VGPR] or better), were performed at protocol-defined time points. The primary study objective for the safety run-in was to confirm the recommended dose of Isa in combination with Rd. Overall response rate (ORR) and MRD negativity rate at 10-5 sensitivity were included as secondary endpoints.