This study is testing a new treatment called P-BCMA-ALLO1 for people with Multiple Myeloma, a type of blood cancer. This treatment uses a special kind of T-cells, which are cells in your body that help fight infections. These T-cells are modified in a lab to better attack cancer cells. The study is in Phase 1, which means it is one of the first times this treatment is being tested in humans. This phase will help find the best dose and check for safety.

Before joining, you will need to agree to several conditions, like using birth control and having a negative pregnancy test if you are a woman of childbearing age. You also need to be in good health besides having Multiple Myeloma. Pregnant or breastfeeding women cannot join, and neither can people with certain other health issues.

• The study involves several visits, with tests and responses checked over time.
• You might receive a single dose or multiple doses of the treatment.
• There may be risks due to the new treatment, but safety will be closely monitored.