Trial Outcomes & Findings for BGB 3111 in Combination With Obinutuzumab in Participants With B-Cell Lymphoid Malignancies (NCT NCT02569476)

This study was conducted at 15 study centers in Australia, South Korea, and the United States (US). A total of 119 participants were enrolled in the study and received ≥1 dose of study treatment.

BGB 3111 in Combination With Obinutuzumab in Participants With B-Cell Lymphoid Malignancies

An AE was defined as any untoward medical occurrence in a participant or clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product (zanubrutinib in combination with obinutuzumab). An AE could therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of the study drug. A serious AE (SAE) was any untoward medical occurrence that, at any dose. * resulted in death, * was life threatening, * required hospitalization or prolongation of existing hospitalization, * resulted in disability/incapacity, * was a congenital anomaly/birth defect.

Laboratory results are reported as participants with shifts towards (high directionality) or away (low directionality) from Grade 3 or Higher Toxicity.

An AE was defined as any untoward medical occurrence in a participant or clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product (zanubrutinib in combination with obinutuzumab). An AE could therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study drug. An SAE was any untoward medical occurrence that, at any dose: * resulted in death, * was life threatening, * required hospitalization or prolongation of existing hospitalization, * resulted in disability/incapacity, * was a congenital anomaly/birth defect.

Dose-limiting toxicities were defined as a toxicity or AE occurring during the DLT assessment period (first 29 days of treatment), which is not clearly attributable to a cause other than zanubrutinib and/or obinutuzumab (such as disease progression, underlying illness, concurrent illness or concomitant medication) and meets one of the following criteria: * Grade 3 or 4 drug-related non-hematologic toxicity (excluding Grade 3 nausea, vomiting, hypertension, and asymptomatic laboratory abnormalities), * Grade 4 drug-related hematologic toxicity persisting for \>14 days, * any grade toxicity, which in the judgment of the investigator or Sponsor, required removal of the participant from the study.

Partial response was defined as follows: * ≥ 50% reduction of serum IgM from baseline, * reduction in lymphadenopathy/splenomegaly (if present at baseline). For response assessments that occurred during cycles where a CT scan was not required, then results from prior scans (up to 12 weeks during the first 48 weeks and up to 24 weeks thereafter) could be carried forward in those participants with extramedullary disease at baseline.

Complete response was defined as follows: * normal serum IgM values, * disappearance of monoclonal protein by immunofixation, * no histological evidence of bone marrow involvement, * complete resolution of lymphadenopathy/splenomegaly (if present at baseline) For response assessments that occurred during cycles where a computed tomography (CT) scan was not required, then results from prior scans (up to 12 weeks during the first 48 weeks and up to 24 weeks thereafter) could be carried forward in those participants with extramedullary disease at baseline.

Progression-free survival was defined as time (in months) from the start of treatment with zanubrutinib or obinutuzumab to the first documented disease progression or death due to any cause, whichever occurred first. Results are reported as the median months for each of the B-cell malignancy subtypes: chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL), Waldenström macroglobulinemia (WM), follicular lymphoma (FL), mantle cell lymphoma (MCL), marginal zone lymphoma (MZL), and non-germinal center B-cell-like (GCB) diffuse large B-cell lymphoma (DLBCL).

Duration of response for responders was defined as the time (in months) from the date of the earliest qualifying response to the date of progressive disease or death due to any cause (whichever occurred earlier). Duration of response was analyzed using the same methods as the analysis for PFS. Responses after initiating new anticancer therapy, roll over to the long-term extension (LTE) study, or the first occurrence of disease progression were not considered in the analysis.

The TTR for responders was defined as time (in months) from the start of the study treatment to the date of the earliest qualifying response. The TTR was summarized using descriptive statistics. Responses after initiating new anticancer therapy, roll over to the LTE study, or the first occurrence of disease progression were not considered in the analysis of TTR.

Overall survival was defined as the time (in months) from the date of the start of the study treatment to death due to any cause. Participants who were alive before final database lock or discontinuation of the study (discontinued study due to reasons other than death) were censored at their last known alive date on or before database lock.

The number and percentage of participants with CLL with anemia (hemoglobin ≤110 grams/liter \[g/L\]), neutropenia (absolute neutrophil count ≤1.5 x 10\^9/L), or thrombocytopenia (platelet count ≤100 x 10\^9/L) at baseline were estimated.

An AE was defined as any untoward medical occurrence in a participant or clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product (zanubrutinib in combination with obinutuzumab). An AE could therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study drug. An SAE was any untoward medical occurrence that, at any dose,: * resulted in death, * was life threatening, * required hospitalization or prolongation of existing hospitalization, * resulted in disability/incapacity, * was a congenital anomaly/birth defect.

Results are reported as participants with shifts towards (high directionality) or away (low directionality) from Grade 3 or Higher Toxicity.

An AE was defined as any untoward medical occurrence in a participant or clinical investigation participant, temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product (zanubrutinib in combination with obinutuzumab). An AE could therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of study drug. An SAE was any untoward medical occurrence that, at any dose,: * resulted in death, * is life threatening, * required hospitalization or prolongation of existing hospitalization, * resulted in disability/incapacity, * was a congenital anomaly/birth defect.