A Dose-Escalation and Expansion Study of Tacabrutideg (BGB-16673) in Participants With B-Cell Malignancies

A B-cell malignancy is a type of cancer that starts in white blood cells called B-cells. These cancers can affect the lymph nodes, bone marrow, blood, spleen, and other organs. Examples of these cancers include chronic lymphocytic leukemia/small lymphocytic lymphoma, marginal zone lymphoma, follicular lymphoma, Waldenström macroglobulinemia, mantle cell lymphoma, and diffuse large B cell lymphoma. Tacabrutideg is a type of medicine called a BTK degrader. BTK (Bruton's tyrosine kinase) is a protein that helps cancer cells survive. Tacabrutideg is designed to attach to the BTK protein and tag it for removal, so that the body's own cellular "clean-up" system breaks it down and clears it away. When more BTK is removed from the body, it interferes with the signals needed for the cancer cells to multiply and survive and may also reduce the chance of the cancer becoming resistant to treatment. The purpose of this study is to test whether tacabrutideg is safe and if it can treat B-cell malignancies. The main goals are to ensure the drug is safe by monitoring side effects and to understand how well patients respond to the treatment and whether their cancers shrink or disappear. This study consists of two parts: dose escalation and dose expansion. During the dose escalation part, the study doctors will test different doses of the study drug to find the recommended dose that people can take without having serious side effects. During the dose expansion part, the study doctors will test the study drug in a larger number of people using the dose or doses identified from dose escalation. The study is open label, which means that the participants and the study doctors will know what treatment is received. This study will enroll approximately 689 participants with B-cell malignancies at multiple centers worldwide. The overall time to participate in this study is approximately 3 years. Participants will make regular visits to the clinic for treatment, health checks, blood tests, and tumor and imaging tests. Our company, previously known as BeiGene, is now officially BeOne Medicines. Because some of our older studies were sponsored under the name BeiGene, you may see both names used for this study on this website.