This clinical trial is focused on studying a type of blood cancer called relapsed/refractory B cell precursor acute lymphoblastic leukemia (BCP-ALL). This condition occurs when the cancer returns or does not respond to treatment. The study is testing a combination of two treatments: Venetoclax and Blinatumomab. Venetoclax, also known by its code names ABT-199 and GDC-0199, is a medication that comes in the form of film-coated tablets and is taken orally. Blinatumomab is a medication given through an intravenous infusion, which means it is administered directly into the bloodstream.
The purpose of this study is to determine how safe and tolerable the combination of Venetoclax and Blinatumomab is for patients, as well as to find the best dose to use. The study will also evaluate how well patients respond to this combination treatment. The trial is divided into two phases. In the first phase, researchers will focus on understanding the safety and appropriate dosage of the treatment. In the second phase, they will assess how effective the treatment is in helping patients with BCP-ALL.
Participants in the study will receive the combination of Venetoclax and Blinatumomab, and some may receive a placebo. The study will continue until the researchers gather enough information to understand the effects of the treatment. This trial aims to provide valuable insights into the potential benefits of combining these two medications for treating BCP-ALL, offering hope for improved outcomes in patients with this challenging condition.



Germany