NCT05651932 A Study of an MMSET Inhibitor in Patients With Relapsed and Refractory Multiple Myeloma

Eligibility & Interventions

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What to Expect as a Participant

You will actively receive the study intervention — which may be a drug, biologic, device, or procedure.

Phase 1 is the earliest stage of human testing — safety and dosage are the primary focus. Visits are frequent and medical supervision is intensive. You will be among the first people to receive this treatment.

This trial targets 165 participants in total. It began in 2023-02-22 with a primary completion date of 2027-12-31.

Brief Summary

A Phase I study to evaluate the safety of a novel, orally available, selective, and potent small molecule inhibitor of the histone lysine methyl transferase MMSET (also known as NSD2/WHSC1) to prevent the dimethylation of H3K36 in adult patients with relapsed or refractory multiple myeloma (RRMM).

Eligibility Criteria

Key Inclusion Criteria for Dose-Expansion: * ≥ 18 years of age * ECOG score ≤ 1 * Multiple myeloma (as per IMWG) * Prior therapy for MM: Participants must have received at least 1 and up to 3 prior lines of therapy as defined by IMWG, and the following drug classes: PI, IMiD, and anti-CD38 antibody. For mezigdomide combination Cohorts B1 and B2, participants must have received at least 2 prior lines of therapy * Participants must have a confirmed diagnosis of progressive MM (per IMWG), t(4;14) confirmed by fluorescence in situ hybridization (FISH) testing performed in a centralized Clinical Laboratory Improvement Amendments (CLIA) accredited laboratory via fresh tumor biopsy. * Measurable disease, including at least 1 of the following criteria: * Serum M protein ≥ 0.50 g/dL (by SPEP) * Serum IgA ≥ 0.50 g/dL (IgA myeloma patients) * Urine M protein ≥ 200 mg/24 h (by UPEP) * sFLC involved light chain ≥ 10 mg/dL (100 mg/L) (patients with abnormal sFLC ratio) * Bone marrow plasma cells ≥ 30% (if only criterion for measurability) * Agreement to enroll into the REMS program (Cohort D- pomalidomide cohort only) Key Exclusion Criteria for Dose-Expansion: * Treatment with the following therapies in the specified time period prior to first dose: * Patients in Cohorts B1 and B2 must not have received prior mezigdomide treatment * Carfilzomib in the immediate last prior line of therapy for patients enrolled in Cohorts C1 and C2 * Pomalidomide in the immediate last prior line of therapy for patients enrolled in cohort D * Radiation, chemotherapy, immunotherapy, or any other anticancer therapy ≤ 2 weeks * Cellular therapies ≤ 8 weeks * Autologous transplant \< 100 days * Allogenic transplant ≤ 6 months, or \> 6 months with active GVHD * Major surgery ≤ 4 weeks * Current plasma cell leukemia, POEMS (polyneuropathy, organomegaly, endocrinopathy, and skin changes) syndrome, solitary bone lesion or bone lesions as the only evidence for plasma cell dyscrasia, myelodysplastic syndrome or a myeloproliferative neoplasm or light chain amyloidosis * Active CNS disease: participants with previously treated stable CNS disease are eligible, except for Cohorts B1 and B2 for which known CNS myeloma involvement is completely excluded. * Inadequate bone marrow function * Inadequate renal, hepatic, pulmonary, and cardiac function * Active, ongoing, or uncontrolled systemic viral, bacterial, or fungal infection. Permitted prophylactic medications, antimicrobials or antiretroviral therapies defined in protocol. * Use of acid reducing agents and strong inhibitors or inducers of CYP3A4 within 7 days or 5 half-lives (whichever is longer) prior to first dose * Strong CYP1A2 inhibitors for patients receiving pomalidomide (Cohort D) * Active malignancy not related to myeloma requiring therapy within \< 2 years prior to enrollment, or not in complete remission, with exceptions defined in protocol.

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