RecruitingPhase 3Drug trialIberdomide vs. Iberdomide Plus Isatuximab Maintenance Therapy Post ASCT in Newly Diagnosed Multiple MyelomaThe goal of this clinical trial is to compare a maintenance therapy consisting of iberdomide and isatuximab with an iberdomide-only regimen. The trial is the subsequent maintenance therapy to GMMG-HD8/DSMM XIX trial for patients with newly-diagnosed multiple myeloma. Patients with newly-diagnosed multiple myeloma who underwent a similar quadruplet induction/consolidation therapy regimen followed by at least one ASCT can also be recruited. The main question it aims to answer is: • Will the addition of isatuximab lead to decreased amounts of measurable myeloma cells in the bone marrow after two years?