Venetoclax in Combination With BEAM Conditioning Regimen for ASCT in Non-Hodgkin Lymphoma

The purpose of this study is to determine the correct dose and safety of adding a new cancer drug, Venetoclax, to a standard combination of chemotherapy drugs used prior to Autologous stem cell transplant (ASCT) in participants with Non-Hodgkin Lymphoma (NHL). In this study, Venetoclax will be added to BEAM (BCNU or carmustine, etoposide, cytarabine or ara-c, and melphalan). All NHL participants are admitted for conditioning chemotherapy which is given prior to the infusion of stem cells. Venetoclax is a new anti-cancer drug that works by targeting a protein (known as the Bcl-2 protein). By inhibiting or "blocking" this protein, a downstream cascade occurs which results in cancer cells to die. Adding Venetoclax to the standard BEAM conditioning chemotherapy with autologous stem cell transplant is believed to increase the chance of remission. Venetoclax is Food and Drug Administration (FDA) approved for participants with chronic lymphocytic leukemia (CLL). However, Venetoclax is investigational for this study because it is not yet approved for use in participants with NHL or in combination with BEAM chemotherapy.