This study is about trying a new medicine called **linvoseltamab** with other medicines to treat a blood cancer named **multiple myeloma**. Multiple myeloma is a type of cancer that affects certain blood cells in the body. The study is for adults whose cancer didn't get better with regular treatments. Linvoseltamab has been tested before by itself and helped some people's cancer.

The main goal is to see if linvoseltamab can be safely mixed with other cancer medicines and to find out the right amount to use. The study also wants to learn about any side effects and how much medicine stays in the blood.

• Study Length: Participants will need to be in the study for an extended time to track progress.
• Risks: Possible side effects from mixing medicines.
• Requirements: Participants must have tried multiple treatment lines before joining.

Before joining, doctors will check if you're eligible, like having a good performance status and a life expectancy of at least 6 months. Not everyone can join, like those with certain other health issues or who had recent treatments. Always discuss participation with your doctor.