Summary
The purpose of this study is to identify the recommended Phase 2 regimen(s) (RP2R[s]) and
schedule for the study treatment (Part 1), to characterize the safety of the RP2R(s) for
the study treatment (Part 2) and to evaluate the anticancer activity of talquetamab +
teclistamab in participants with relapsed or refractory multiple myeloma and
extramedullary disease (EMD) (Part 3).