This study is testing a new medicine called **BMF-219**, which is taken by mouth. It's for adults with certain types of blood cancers, like acute myeloid leukemia (AML), acute lymphocytic leukemia (ALL), diffuse large B-cell lymphoma (DLBCL), multiple myeloma (MM), and chronic lymphocytic lymphoma (CLL/SLL). The study will see how much of the medicine is safe and if it helps people. To join, you need to be 18 or older and have one of these cancers that hasn't improved with other treatments.

• **Study Length**: The study may take several months, with regular visits for check-ups and tests.
• **Participation**: You need to stop previous treatments and meet certain health conditions to join.
• **Risks**: Possible side effects and risks related to the new medicine, prior menin inhibitor treatments are not allowed.

If you join, you'll have to visit the doctor often and might need to use birth control. You can't join if you have certain infections, or have had some other treatments or conditions. This study might help find better ways to treat these cancers.