RecruitingPhase 1ProcedureMC210808 Venetoclax in Combination With Lenalidomide and Dexamethasone (Ven-Rd), Daratumumab and Dexamethasone (Ven-Dd), or Daratumumab-Lenalidomide-Dexamethasone (Ven-DRd) for the Treatment of Multiple MyelomaThis phase I trial tests the safety, side effects, and best dose of venetoclax in combination with lenalidomide and dexamethasone, daratumumab and dexamethasone, or daratumumab, lenalidomide, and dexamethasone in treating patients with multiple myeloma. Venetoclax is in a class of medications called B-cell lymphoma-2 (BCL-2) inhibitors. It may stop the growth of cancer cells by blocking Bcl-2, a protein needed for cancer cell survival. Lenalidomide is a drug that is similar to thalidomide, and is used to treat multiple myeloma and certain types of anemia. Lenalidomide belongs to the family of drugs called angiogenesis inhibitors. Dexamethasone is in a class of medications called corticosteroids. It is used to reduce inflammation and lower the body's immune response to help lessen the side effects of chemotherapy drugs. Daratumumab is in a class of medications called monoclonal antibodies. It binds to a protein called CD38, which is found on some types of immune cells and cancer cells, including myeloma cells. Daratumumab may block CD38 and help the immune system kill cancer cells. Adding venetoclax to the other drug combinations may allow control of the cancer than is possible with the current treatments.