A Study to Determine the Recommended Dose and Schedule, and Evaluate the Safety and Preliminary Efficacy of Mezigdomide in Combination With Elranatamab in Participants With Relapsed and/or Refractory Multiple Myeloma

Inclusion Criteria

• Age ≥18 with history of relapsed and refractory multiple myeloma (RRMM) treated with 2 to 4 prior lines of anti-myeloma therapy (Phase 1) or 1 to 3 prior lines of anti-myeloma therapy (Phase 2).
• Measurable MM by local laboratory.
• Eastern Cooperative Oncology Group performance status (ECOG PS) of 0 to 1.
• Adherence to contraception requirements.

Exclusion Criteria

• Prior treatment with mezigdomide.
• Prior treatment with T cell engaging or T cell engager (TCE).
• Prior treatment with B cell-maturation antigen (BCMA)-targeting therapy, with the exception of participants who have received autologous BCMA-targeted CART-cell therapy> 6 months from the start of study therapy
• Other protocol-defined Inclusion/Exclusion criteria apply.