MajesTEC-2: This phase I study is trying to understand how safe and tolerable, and determine the optimal dose level, of a targeted therapy (teclistamab) when it is administered in different combinations with other cancer drugs in people with multiple myelomaA Multi-arm Phase 1b Study of Teclistamab With Other Anticancer Therapies in Participants With Multiple Myeloma

Inclusion

• Have documented initial diagnosis of multiple myeloma according to international myeloma working group (IMWG) diagnostic criteria
• Meet treatment regimen-specific requirements as follows: Treatment Regimen A (teclistamab [tec]-daratumumab [dara]-pomalidomide [pom]) only: Participant has relapsed or refractory multiple myeloma and has received 1 to 3 prior lines of therapy, including exposure to a proteasome inhibitor (PI) and lenalidomide; Treatment Regimen B (tec-dara-lenalidomide [len]-bortezomib [bor]) only: Participant has newly diagnosed or relapsed/refractory multiple myeloma and is naive to treatment with lenalidomide; Treatment Regimen C (tec-nirogacestat [niro]) only: Participant has relapsed or refractory multiple myeloma and has 1) received 3 or more prior lines of therapy or 2) is double refractory to a PI and an immunomodulatory drug (IMiD) and triple exposed to a PI, an IMiD, and an anti-cluster of differentiation (CD)38 monoclonal antibody (mAb); Treatment Regimen D (tec-len) only: Participant has multiple myeloma and has received greater than or equal to (>=) 2 prior lines of therapy, including exposure to a PI, an IMiD, and an anti-CD38 mAb; Treatment Regimen E (tec-dara-len) only: Participant has newly diagnosed multiple myeloma or if previously treated has received 1 to 3 prior lines of therapy, including exposure to a PI and an IMiD; Treatment Regimen F (tec-dara-len-bor) only: Participant has newly diagnosed multiple myeloma
• Have measurable disease at screening as defined by at least one of the following: serum M-protein level >= 1.0 gram/deciliter (g/dL); or urine M-protein level >= 200 milligrams (mg)/24 hours; or light chain multiple myeloma: serum immunoglobulin (Ig) free light chain (FLC) >= 10 milligram/deciliter (mg/dL) and abnormal serum Ig kappa lambda FLC ratio
• A woman of childbearing potential must have a negative serum (beta human chorionic gonadotropin [hCG]) pregnancy test at screening and a negative urine or serum pregnancy test within 24 hours before the start of study treatment administration and must agree to further serum or urine pregnancy tests during the study
• A woman must agree not to donate eggs (ova, oocytes) for the purposes of assisted reproduction during the study and for at least 100 days after the last dose of study treatment