This study is assessing how safe and effective a new targeted therapy (called ABBV-453) is in people with relapsed or refractory multiple myelomaFirst-in-Human Study of the BCL-2 Inhibitor ABBV-453 in Biomarker-Selected Subjects With Relapsed or Refractory Multiple Myeloma

Inclusion

• Eastern Cooperative Oncology Group (ECOG) performance status <= 1.
• Laboratory values meeting the criteria outlined in the protocol.
• Documented diagnosis of multiple myeloma (MM) based on standard International Myeloma Working Group (IMWG) criteria.
• Has measurable disease at screening as defined in the protocol.
• Locally documented or centrally determined t(11;14) positive status and/or centrally determined BCL2high status. Note: If local testing for t(11;14) is discordant with central testing for t(11;14) status, a detailed review of central and local results for t(11;14) status is required to ensure the participants' safety.
• Part 1 and Part 2, Arm 1 Only: Refractory to or intolerant of all established MM therapies that are known to provide clinical benefit and are triple class exposed to a proteasome inhibitors (PI), an Immunomodulatory drugs (IMID), and an anti-CD38 monoclonal antibody in previous line(s) of therapy.
• Part 2, Arms 2 and 3 Only: Received 1 to 3 prior lines of therapy, including a PI or an IMiD.
• Part 1 only: Permitted to be venetoclax or BCL-2 inhibitor exposed in previous lines of therapy.
• Life expectancy >= 12 weeks.