This study aims to explore the recommended phase 2 dose and evaluate the safety, tolerability and preliminary antitumor activity of BGB-16673 monotherapy at the recommended Phase 2 dose for the selected B-cell malignancy expansion cohorts
Provision of signed and dated written informed consent prior to any study
Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 to 2
Adequate organ function of coagulation function, liver function, renal function and pancreatic function and measure disease per disease-specific response criteria
Phase 1: Confirmed diagnosis of R/R Marginal Zone Lymphoma (MZL), Follicular Lymphoma (grade 1-3a), Waldenström Macroglobulinemia (WM), non-germinal center B-cell (non-GCB) diffuse large B-cell lymphoma (DLBCL), Richter's transformation to DLBCL, MCL, or CLL/SLL
Prior malignancy (other than the disease under study) within the past 2 years, except for curatively treated basal or squamous skin cancer, superficial bladder cancer, carcinoma in situ of the cervix or breast, or localized Gleason score ≤ 6 prostate cancer
Require ongoing systemic treatment for any other malignancy or systemic corticosteroid treatment
Receiving treatment with a strong CYP3A inhibitor or inducer ≤ 14 days before the first dose of BGB-16673, or proton-pump inhibitors ≤ 5 days before the first dose of BGB-16673.
Current or history of central nervous involvement