Scientific publications
Mezigdomide plus Dexamethasone in Relapsed and Refractory Multiple Myeloma. Scientific Publication
Paul G Richardson 1 , Suzanne Trudel 1 , Rakesh Popat 1 , María-Victoria Mateos 1 , Annette J Vangsted 1 , Karthik Ramasamy 1 , Joaquín Martinez-Lopez 1 , Hang Quach 1 , Robert Z Orlowski 1 , Mario Arnao 1 , Sagar Lonial 1 , Chatchada Karanes 1 , Charlotte Pawlyn 1 , Kihyun Kim 1 , Albert Oriol 1 , Jesus G Berdeja 1 , Paula Rodríguez Otero 1 , Ignacio Casas-Avilés 1 , Alessia Spirli 1 , Jennifer Poon 1 , Shaoyi Li 1 , Jing Gong 1 , Lilly Wong 1 , Manisha Lamba 1 , Daniel W Pierce 1 , Michael Amatangelo 1 , Teresa Peluso 1 , Paulo Maciag 1 , Jessica Katz 1 , Michael Pourdehnad 1 , Nizar J Bahlis 1 ; CC-92480-MM-001 Study Investigators
Background: Despite recent progress, multiple myeloma remains incurable. Mezigdomide is a novel cereblon E3 ubiquitin ligase modulator with potent antiproliferative and tumoricidal activity in preclinical models of multiple myeloma, including those resistant to lenalidomide and pomalidomide.
Methods: In this phase 1-2 study, we administered oral mezigdomide in combination with dexamethasone to patients with relapsed and refractory myeloma. The primary objectives of phase 1 (dose-escalation cohort) were to assess safety and pharmacokinetics and to identify the dose and schedule for phase 2. In phase 2 (dose-expansion cohort), objectives included the assessment of the overall response (partial response or better), safety, and efficacy of mezigdomide plus dexamethasone at the dose and schedule determined in phase 1.
Results: In phase 1, a total of 77 patients were enrolled in the study. The most common dose-limiting toxic effects were neutropenia and febrile neutropenia. On the basis of the phase 1 findings, investigators determined the recommended phase 2 dose of mezigdomide to be 1.0 mg, given once daily in combination with dexamethasone for 21 days, followed by 7 days off, in each 28-day cycle. In phase 2, a total of 101 patients received the dose identified in phase 1 in the same schedule. All patients in the dose-expansion cohort had triple-class-refractory multiple myeloma, 30 patients (30%) had received previous anti-B-cell maturation antigen (anti-BCMA) therapy, and 40 (40%) had plasmacytomas. The most common adverse events, almost all of which proved to be reversible, included neutropenia (in 77% of the patients) and infection (in 65%; grade 3, 29%; grade 4, 6%). No unexpected toxic effects were encountered. An overall response occurred in 41% of the patients (95% confidence interval [CI], 31 to 51), the median duration of response was 7.6 months (95% CI, 5.4 to 9.5; data not mature), and the median progression-free survival was 4.4 months (95% CI, 3.0 to 5.5), with a median follow-up of 7.5 months (range, 0.5 to 21.9).
Conclusions: The all-oral combination of mezigdomide plus dexamethasone showed promising efficacy in patients with heavily pretreated multiple myeloma, with treatment-related adverse events consisting mainly of myelotoxic effects. (Funded by Celgene, a Bristol-Myers Squibb Company; CC-92480-MM-001 ClinicalTrials.gov number, NCT03374085; EudraCT number, 2017-001236-19.).
CITATION N Engl J Med. 2023 Sep 14;389(11):1009-1022. doi: 10.1056/NEJMoa2303194. Epub 2023 Aug 30
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