A Study to Evaluate a Novel Gene Therapy in Patients With Relapsed and Refractory Multiple Myeloma

Inclusion Criteria:

* Participants must have relapsed and refractory multiple myeloma (RRMM) with measurable disease
* Participants must have received at least 3 prior lines of therapy including a proteasome inhibitor (PI), an immunomodulatory drug (IMiD), and CD38-directed monoclonal antibody
* Participants must have an Eastern Cooperative Group (ECOG) performance status of 0-1
* Participants must have acceptable laboratory values as defined by the protocol

Exclusion Criteria:

* Participants must not have known central nervous system (CNS) involvement with myeloma
* Participants cannot have plasma cell leukemia, Waldenstrom's macroglobulinemia, POEMS (polyneuropathy, organomegaly, endocrinopathy, and skin changes) syndrome, or primary light chain amyloidosis
* Participants cannot have ongoing acute systemic infection requiring antimicrobial therapy
* Participants cannot require systemic steroids for any condition