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RecruitingLast updated: 22 July 2025

SUCCESSOR-1: This study is comparing two different combinations of drugs to determine which is more safe and effective in treating people with relapsed or refractory multiple myeloma who have had prior treatmentA Phase 3, Two-Stage, Randomized, Multicenter, Open-Label Study Comparing Mezigdomide (CC-92480), Bortezomib and Dexamethasone (MEZIVd) Versus Pomalidomide, Bortezomib and Dexamethasone (PVd) in Subjects With Relapsed or Refractory Multiple Myeloma (RRMM)

Trial purpose

Medical clipboardCancer treatment

Tumor type

Blood Cancers Haematological

Age

People18+

Trial acronym

SUCCESSOR-1

Clinical summary

Summary

Eligible participants will be randomly allocated to one of two experimental treatment arms.

In Arm A, participants will receive MeziVd treatment, which is a combination of mezigdomide, bortezomib and dexamethasone.

In Arm B, participants will receive PVd treatment, which is a combination of pomalidomide, bortezomib and dexamethasone.

Conditions

This trial is treating patients with relapsed or refractory multiple myeloma

Eligibility

Inclusion

  • Participant has documented diagnosis of MM and measurable disease, defined as any of the following:

    • M-protein ≥ 0.5 grams per deciliter (g/dL) by serum protein electrophoresis (sPEP) or
    • M-protein ≥ 200 milligrams (mg) per 24-hour urine collection by urine protein electrophoresis (uPEP)
    • For participants without measurable disease in sPEP or uPEP: serum free light chain (sFLC) levels > 100 mg/L (10 mg/dL) involved light chain and an abnormal kappa/lambda FLC ratio.
  • Participants received 1 to 3 prior lines of antimyeloma therapy.
  • Participants achieved minimal response [MR] or better to at least 1 prior antimyeloma therapy.

Exclusion

  • Participant has had progression during treatment or within 60 days of the last dose of a proteasome inhibitor, except as noted below:

    a. Subjects who progressed while being treated with, or within 60 days of last dose of bortezomib maintenance given once every 2 weeks or less are not excluded.

  • For participants with prior treatment of a bortezomib containing regimen, the best response achieved was not a minimal response (MR) or better, or participant discontinued bortezomib due to toxicity.
  • Participant has had prior treatment with mezigdomide or pomalidomide.

Other protocol-defined criteria apply.

Inclusion

  • You have had treatment, but your cancer has come back (relapsed or recurrent).
  • You have had treatment but your cancer has gotten worse or has not responded to the treatment you have been given.
  • You have had a certain type of treatment or surgical procedure.

Exclusion

  • You have had certain treatments, surgical procedures or drugs.
Message

Clinical trials have complex eligibility criteria, and other criteria may apply for this trial. Ask your doctor about whether this trial could be right for you.

Participating hospitals

Recruiting hospitals

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More information

Trial Identifiers

Information on this page is partially produced from ClinicalTrials.gov *. View further details about this trial on the registry via the links below:

Trial sponsor

Celgene

Scientific Title

A Phase 3, Two-Stage, Randomized, Multicenter, Open-Label Study Comparing Mezigdomide (CC-92480), Bortezomib and Dexamethasone (MEZIVd) Versus Pomalidomide, Bortezomib and Dexamethasone (PVd) in Subjects With Relapsed or Refractory Multiple Myeloma (RRMM)

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