This is a multicenter, randomized, open-label, Phase 3 study in participants with newly diagnosed multiple myeloma to evaluate the benefits of teclistamab in combination with lenalidomide and teclistamab alone versus lenalidomide alone as maintenance therapy after autologous stem cell transplant.

This study is for patients that have been diagnosed with multiple myeloma. The usual approach for patients with newly diagnosed multiple myeloma who are not in a study, is lenalidomide and dexamethasone in combination with bortezomib or daratumumab. This approach is approved by the Food and Drug Administration (FDA). The purpose of this study is to see if patients who have a small amount of cancer left after initial treatment (called minimal residual disease (MRD)), could benefit from adding a new drug to the usual treatment. The study approach, using a combination of four drugs, is investigational and not approved by the FDA. Patients can expect to be on this study for up to 2 years. Patients will then be followed by their doctor for up to 15 years after completion of the study or until disease progression..