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Introduction: Renal impairment (RI) is a common feature in multiple myeloma (MM) and an adverse predictor of survival. Anti-myeloma treatments that can also improve renal function in patients (pts) with MM are required. Isatuximab (Isa), a monoclonal CD38 antibody, is approved in combination with pomalidomide and dexamethasone (d), in the United States, the European Union, Canada, Australia, Switzerland, and Japan for the treatment of adult pts with relapsed/refractory MM who have received at least two prior therapies, including lenalidomide and a proteasome inhibitor. IKEMA (NCT03275285) was a randomized, open-label, multicenter, Phase 3 study that demonstrated the benefit of adding Isa to carfilzomib (K) plus d vs Kd in pts with relapsed MM. This subgroup analysis of IKEMA examined efficacy, renal response, and safety in pts with RI. Methods: Pts with 1-3 prior lines of therapy were randomized 3:2 and stratified by number of prior lines and revised international staging system (R-ISS) stage to receive Isa-Kd or Kd. The Isa-Kd arm received Isa 10 mg/kg intravenously weekly for 4 weeks, then every 2 weeks thereafter. Both arms received recommended doses of Kd. Treatment continued until disease progression or unacceptable adverse events. Interim efficacy analysis was planned when 65% of the total expected progression-free survival (PFS) events determined by an Independent Response Committee were observed. RI was defined as estimated glomerular filtration rate ([eGFR]; using the Modification of Diet in Renal Disease equation) Results: A total of 302 pts (179 Isa-Kd; 123 Kd) were randomized. Pts with baseline eGFR as low as 15 mL/min/1.73m² (severe RI) were allowed to enroll. more pts with RI in the Isa-Kd arm (26.1%) vs Kd (16.2%). As expected, elderly pts had more RI. The median age in years (range) was 67 (39-86) for Isa-Kd vs 69 (49-90) for Kd among RI pts, and 64 (37-81) for Isa-Kd vs 62 (33-78) for Kd among pts with no RI. In RI pts, 60.5% vs 72.2% pts had ≥2 prior lines of therapy, 11.6% vs 16.7% had R-ISS stage III, and 20.9% vs 27.8% had high risk cytogenetics, in Isa-Kd vs Kd, respectively. More RI pts were still on treatment at the cut-off date in Isa-Kd (55.8%) vs Kd (16.7%). Median PFS for RI pts was not reached for Isa-Kd vs 13.4 months for Kd (HR 0.27; 95% CI 0.11-0.66), and not reached for both study arms among pts with no RI (HR 0.63; 95% CI 0.39-1.00). The overall response rate, ≥very good partial response rate, and minimal residual disease negativity for RI pts was higher with Isa-Kd than Kd: 93.0% vs 61.1%, 79.1% vs 44.4%, and 30.2% vs 11.1%, respectively. CrR accessed in pts with eGFR Conclusions: The addition of Isa to Kd improved PFS and disease response in pts with RI, with a manageable safety profile, consistent with the benefit observed in the overall IKEMA study population. Also, more pts treated with Isa-Kd showed reversal of RI and durable renal responses compared with Kd. Finally, RI pts treated with Isa-Kd received twice the number of cycles and had a lower treatment discontinuation rate compared with Kd pts. Disclosures Martin: AMGEN: Research Funding; Sanofi: Research Funding; GSK: Consultancy; Seattle Genetics: Research Funding; Janssen: Research Funding. Moreau:Novartis: Honoraria; Sanofi: Consultancy, Honoraria; Abbvie: Consultancy, Honoraria; Amgen: Consultancy, Honoraria; Celgene/Bristol-Myers Squibb: Consultancy, Honoraria; Janssen: Consultancy, Honoraria; Takeda: Honoraria. Baker:Sanofi: Research Funding. Leleu:Karyopharm: Honoraria; Sanofi: Honoraria; Novartis: Honoraria; AbbVie: Honoraria; Amgen: Honoraria; Oncopeptide: Honoraria; Incyte: Honoraria; Merck: Honoraria; Carsgen: Honoraria; Janssen: Honoraria; BMS-celgene: Honoraria; GSK: Honoraria. Mohty:Sanofi: Consultancy, Honoraria, Research Funding, Speakers Bureau; Novartis: Consultancy, Honoraria, Research Funding, Speakers Bureau; BMS: Consultancy, Honoraria, Research Funding, Speakers Bureau; GSK: Consultancy, Honoraria, Research Funding, Speakers Bureau; Celgene: Consultancy, Honoraria, Research Funding, Speakers Bureau; Janssen: Consultancy, Honoraria, Research Funding, Speakers Bureau; Stemline: Consultancy, Honoraria, Research Funding, Speakers Bureau; Takeda: Consultancy, Honoraria, Research Funding, Speakers Bureau; Amgen: Consultancy, Honoraria, Research Funding, Speakers Bureau; Jazz Pharmaceuticals: Consultancy, Honoraria, Research Funding, Speakers Bureau. Leblanc:Celgene: Research Funding; Celgene Canada; Janssen Inc.; Amgen Canada; Takeda Canada: Membership on an entity's Board of Directors or advisory committees. Risse:Sanofi: Current Employment. Malinge:AIXIAL: Consultancy. Schwab:Sanofi: Current Employment. Dimopoulos:BMS: Consultancy, Membership on an entity's Board of Directors or advisory committees, Other: Personal fees; Celgene: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Personal fees, Speakers Bureau; Janssen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Personal fees, Research Funding, Speakers Bureau; Amgen: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Personal fees, Research Funding, Speakers Bureau; Takeda: Consultancy, Honoraria, Membership on an entity's Board of Directors or advisory committees, Other: Personal fees, Research Funding, Speakers Bureau.