A Study to Investigate Sonrotoclax Combined With Zanubrutinib Versus Zanubrutinib Alone in Participants With Previously Untreated Chronic Lymphocytic Leukemia

This study will test how effective and safe sonrotoclax plus zanubrutinib treatment compared with zanubrutinib alone in participants with previously untreated chronic lymphocytic leukemia (CLL). The main goals of the study are to determine how many participants may no longer have evidence of cancer or have some improvement in the signs and symptoms of cancer after treatment and to determine what adverse events, or side effects, patients might experience. Sonrotoclax is an experimental drug that works by blocking a protein called B-cell lymphoma-2 (Bcl-2). This protein helps certain types of blood tumor cells to survive and grow. When sonrotoclax blocks Bcl-2 it slows down or stops the growth of tumor cells and helps them die. This can lead to improvements in patients with CLL disease. Zanubrutinib is a commercialized product that works by blocking a protein called Bruton's tyrosine kinase (BTK) and controlling the activity and survival of malignant B cells. Zanubrutinib has received approval in over 65 countries/regions worldwide for the treatment of adult participants with B cell malignancies, including CLL. The study will enroll approximately 87 participants who will be randomly assigned by a computer program to receive one of the following treatments: sonrotoclax + zanubrutinib or zanubrutinib. The study will take place at multiple centers worldwide. The overall time to participate in this study is approximately 5 years.