Zanubrutinib (BGB-3111) in Combination With Tislelizumab (BGB-A317) in Participants With B-cell Malignancies

Key Inclusion Criteria

Participants may be entered in the study only if they meet all of the following criteria:

• Dose escalation for Dose Levels 1, 2, and 3: participants with relapsed or refractory World Health Organization (WHO) classification-defined B-lymphoid malignancy following at least 1 line of therapy, with no therapy of higher priority available, including chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL), mantle cell lymphoma (MCL), follicular lymphoma (FL), human cultured lymphoblast (HCL), Marginal zone lymphoma (MZL), non-germinal center B-cell (GCB) DLBCL, GCB DLBCL, transformed FL, and Richter's transformation (NOTE: participants with WM are excluded from enrollment as of Amendment 3).
• Dose expansion for Cohorts 1 to 4: participants with either of the following relapsed or refractory WHO-classified lymphoid malignancies who have received at least 1 prior line of standard therapy: a. Cohort 1: GCB DLBCL, with cell of origin defined by either immunohistochemistry or gene expression profiling. b. Cohort 2: non-GCB DLBCL, with cell of origin defined by either immunohistochemistry or gene expression profiling. participants who have transformed to DLBCL from another histology may be enrolled into Cohort 3. c. Cohort 3: Transformed lymphoid malignancy, including but not limited to: i. Large cell transformation of chronic lymphocytic leukemia (Richter's transformation). ii. Large cell transformation of other WHO-classified indolent non-Hodgkin's lymphoma, including FL, or MZL. d. Cohort 4: Histologically confirmed primary central nervous system lymphoma (PCNSL) or secondary central nervous system lymphoma (SCNSL) of breast or testicular origin: i. Must be able to tolerate lumbar puncture and/or Ommaya taps. ii. Must have received at least 1 prior central nervous system (CNS)-directed therapy. iii. Presence of brain parenchymal and/or leptomeningeal disease.
• Aged ≥ 18 years, able and willing to provide written informed consent and to comply with the study protocol.
• Measurable disease for non-Hodgkin lymphoma defined as ≥ 1 nodal lesion that is > 15 mm in the longest diameter and can be accurately measured in at least 2 dimensions with computed tomography (CT) scan, or ≥ 1 extra-nodal lesion that is > 10 mm in the longest diameter and can be accurately measured in at least 2 dimensions with CT scan, except for PCNSL or SCNSL.
• Participants with an accessible tumor lesion must agree to a tumor biopsy at screening and another before the drug administration on Cycle 1 Day 8, ideally taken from the same tumor lesion, for biomarker analysis (up to first 12 qualified participants), except for PCNSL. Additionally, participants with DLBCL must have archival tumor tissue or agree to a tumor biopsy for confirmation of the DLBCL subtype.
• Laboratory parameters as specified below: a. Hematologic: Platelet count ≥ 50 × 109/L; absolute neutrophil count ≥ 1.0 × 109 cells/L; participants with neutrophils 16 mg dexamethasone daily or equivalent. b. Corticosteroid therapy ≤ 16 mg dexamethasone daily or equivalent at study entry from which, in the Investigator's opinion, it is expected that the participant cannot be tapered off after the first 4 weeks of study treatment. c. Intraocular PCNSL without evidence of brain disease. d. SCNSL actively receiving treatment for extra-CNS disease. e. PCNSL actively receiving concomitant local or systemic therapy for CNS disease.
• Uncontrolled autoimmune hemolytic anemia or idiopathic thrombocytopenia purpura.
• History of stroke or cerebral hemorrhage within 6 months of enrollment.
• History of significant cardiovascular disease, defined as: a. Congestive heart failure greater than New York Heart Association (NYHA) class II according to the NYHA functional classification. b. Unstable angina or myocardial infarction with 6 months of enrollment. c. Serious cardiac arrhythmia or clinically significant ECG abnormality: corrected QT wave (QTcF) > 480 msec based on t