A Study to Compare Iberdomide Maintenance Versus Lenalidomide Maintenance Therapy Following Autologous Stem Cell Transplant in Participants With Newly Diagnosed Multiple Myeloma

Inclusion criteria

• Confirmed diagnosis of symptomatic multiple myeloma (MM).
• Eastern Cooperative Oncology Group performance status (ECOG) score of 0, 1, or 2.
• Received 3 to 6 cycles of an induction therapy that includes a proteasome inhibitor (PI) and immunomodulatory (IMiD) [eg, bortezomib thalidomide and dexamethasone (VTd), lenalidomide, bortezomib and dexamethasone (RVd)] with or without a CD38 monoclonal antibody, daratumumab + bortezomib/thalidomide/dexamethasone [D-VTd] and daratumumab + bortezomib/ lenalidomide/dexamethasone [D-VRd]), or VCd / daratumumab + bortezomib/cyclophosphamide/dexamethasone [D-VCd], and followed by a single or tandem autologous stem cell transplantation (ASCT). Post-stem cell transplant consolidation is permitted.
• Participants within 12 months (single transplant) or 15 months (tandem transplant) from initiation of induction therapy who achieved at least a partial response (PR) after autologous stem cell transplantation (ASCT) with or without consolidation, according to International Myeloma Working Group (IMWG 2016) criteria.

Exclusion criteria

• Progressive disease or clinical relapse (as defined by IMWG response criteria) following ASCT with or without consolidation or is not responsive to primary therapy.
• Smoldering myeloma, solitary plasmacytoma or nonsecretory myeloma.
• Known central nervous system/meningeal involvement of MM.
• Prior history of malignancies, other than MM, unless the participant has been free of the disease for ≥ 5 years.
• Other protocol-defined Inclusion/Exclusion criteria apply.