Study of CC-93269, a BCMA x CD3 T Cell Engaging Antibody, in Participants With Relapsed and Refractory Multiple Myeloma

The dose escalation parts (Part A with CC-93269 administered intravenous (IV) and Part C subcutaneous (SC)) of the study will evaluate the safety and tolerability of escalating doses of CC-93269, administered IV or SC, to determine the maximum tolerated dose (MTD) and non-tolerated dose (NTD) of CC-93269. The expansion parts (Part B and D) will further evaluate the safety and efficacy of CC-93269 administered IV or SC at or below the MTD in selected expansion cohorts of up to approximately 20 evaluable subjects each in order to determine the Recommended Phase 2 dose (RP2D).One or more dosing regimens may be selected for cohort expansion. All treatments will be administered in 28-day cycles for up to 2 years or extended up to 5 years for subjects maintaining clinical benefit at the discretion of the Safety Review Committee, until confirmed disease progression, unacceptable toxicity, or subject/investigator decision to withdraw.