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Kiesel B, Osawa M, Masilamani M, Bar M, Hsu K, Godwin C, Burgess M, Lamba M, Gaudy A. Informing the Recommended Phase III Dose of Alnuctamab, a CD3 × BCMA T-Cell Engager, Using Population Pharmacokinetics and Exposure-Response Analysis. Clin Pharmacol Ther 2024. [PMID: 38938115 DOI: 10.1002/cpt.3353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Accepted: 06/04/2024] [Indexed: 06/29/2024]
Abstract
Alnuctamab, a B-cell maturation antigen (BCMA)-targeting T-cell engager, has demonstrated encouraging antitumor activity in the phase I study CC-93269-MM-001 treating patients with relapsed or refractory multiple myeloma. Identification of a recommended Phase III dose (RP3D) was a key objective, as such population pharmacokinetic (PopPK) and exposure-response analysis was critical. Intravenous (IV) alnuctamab was administered in fixed doses (0.15-10 mg) or in step-up doses to a maximum 10-mg target dose. Subcutaneous (SC) step-up doses of 3 and 6 mg were followed by a target dose range of 10-60 mg. Concentration data from IV and SC alnuctamab administration was pooled and was well described by a two-compartment PopPK model with first-order absorption and elimination. Covariate analysis determined that the inclusion of baseline soluble BCMA (sBCMA) on clearance significantly improved model fitting. Individual exposure parameters were estimated from the final model to characterize exposure-response relationships. Switching from IV to SC administration improved the safety profile of alnuctamab by limiting the frequency of grade ≥2 CRS events. A significant exposure-CRS relationship was observed after the first SC dose, but not subsequent dose administrations. Exposure-safety analysis did not find a statistically significant relationship between increasing exposure and the probability of key safety events of interest. Logistic regression analysis for patients administered SC alnuctamab identified that increased exposure significantly increased the probability of response, although the additional benefit was minimal at exposures above 30 mg target dose. Considering the totality of exposure-response data, the clinical pharmacology assessment supported a SC RP3D of 3/6/30 mg.
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Affiliation(s)
- Brian Kiesel
- Bristol-Myers Squibb, Princeton, New Jersey, USA
| | - Mayu Osawa
- Bristol-Myers Squibb, Princeton, New Jersey, USA
| | | | - Merav Bar
- Bristol-Myers Squibb, Princeton, New Jersey, USA
| | - Kevin Hsu
- Bristol-Myers Squibb, Princeton, New Jersey, USA
| | - Colin Godwin
- Bristol-Myers Squibb, Princeton, New Jersey, USA
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van de Donk NWCJ, Zweegman S. Monoclonal Antibodies in the Treatment of Multiple Myeloma. Hematol Oncol Clin North Am 2024; 38:337-360. [PMID: 38151402 DOI: 10.1016/j.hoc.2023.12.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
The incorporation of monoclonal antibodies into backbone regimens has substantially improved the clinical outcomes of patients with newly diagnosed and relapsed/refractory multiple myeloma (MM). Although the SLAMF7-targeting antibody elotuzumab has no single- agent activity, there is clinical synergy between elotuzumab and immunomodulatory drugs in patients with relapsed/refractory disease. Daratumumab and isatuximab are CD38-targeting antibodies which have single-agent activity and a favorable safety profile, which make these agents an attractive component of combination regimens. Monoclonal antibodies may cause infusion-related reactions, but with subcutaneous administration these are less frequently observed. All therapeutic antibodies may interfere with assessment of complete response. Next-generation Fc-engineered monoclonal antibodies are in development with the potential to further improve the outcome of patients with MM.
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Affiliation(s)
- Niels W C J van de Donk
- Department of Hematology, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam 1081 HV, the Netherlands; Cancer Center Amsterdam, Cancer Biology and Immunology, Amsterdam, the Netherlands.
| | - Sonja Zweegman
- Department of Hematology, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, Amsterdam 1081 HV, the Netherlands; Cancer Center Amsterdam, Cancer Biology and Immunology, Amsterdam, the Netherlands
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