RecruitingPhase 2Biological interventionEfficacy and Safety of Zanubrutinib Plus Tislelizumab Treatment with or Without Sonrotoclax for Patients with Richter TransformationThe aim of the CLL-RT1 trial is to evaluate the efficacy and safety of zanubrutinib (BGB-3111), a BTK inhibitor plus tislelizumab (BGB-A317), a PD1 inhibitor for treatment of patients with Richter Transformation