BeiGene Announces Clinical Results from Three Posters on Zanubrutinib Presented at the 24th Congress of European Hematology Association (EHA)
First Preliminary Data from Exploratory MYD88WT Patient Cohort in Phase 3 Trial in Waldenström’s Macroglobulinemia (WM); Updated Phase 1/2 WM Data; and Pooled Safety Data Analysis on Zanubrutinib in B-Cell Malignancies Presented
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“We are excited to announce new data from ongoing zanubrutinib clinical studies at EHA, including the first results of the Phase 3 ASPEN trial from a non-randomized cohort of patients who have WM with the MYD88WT genotype. For these patients, who typically have poorer prognoses with lower response rates, we recognize the real need for a highly potent and selective BTK inhibitor that can sustain BTK inhibition and reduce off-target effects. We are excited that these data have echoed what we saw in earlier trials, with an overall response rate of 81 percent and a major response rate that includes patients with a partial response or better, of 54% including 23% with a very good partial response (VGPR),” said
Dr. Huang continued, “In addition, with longer follow-up from the global Phase 1/2 trial of zanubrutinib in patients with WM, we’re seeing high rates of CR/VGPR (42%) that are proving to be durable responses. Separately, the pooled safety data analysis of zanubrutinib continues to affirm its tolerability as a selective BTK inhibitor, in patients with B-cell malignancies. We believe that these data further support zanubrutinib’s potential to become a meaningful treatment option for patients with B-cell malignancies around the world.”
Major Responses in Patients with MYD88 Wildtype WM Treated with Zanubrutinib
Abstract Number: PF487
This exploratory analysis included five patients with treatment-naïve (TN) disease and 21 patients with relapsed/refractory (R/R) WM.
- The ORR was 80.8%. MRR (partial response or better) was 53.8% and the VGPR rate was 23.1%. One patient achieved a complete response by IgM criteria with normal IgM levels and negative immunofixation;
- Median time to first major response (partial response or better) was 2.9 months;
- Median progression‑free survival (PFS) and overall survival (OS) have not yet been reached;
- Zanubrutinib tolerability was generally consistent with previous reports. Discontinuation due to adverse events (AEs) occurred in 7.7% of patients (n=2). The primary reason for discontinuation was progressive disease;
- The most common AEs (in >15% pts) were diarrhea (19%), hypertension (19%), contusion (15%), constipation (15%), muscle spasm (15%), pneumonia (15%), and upper respiratory tract infection (15%);
- There were no fatal AEs or atrial fibrillation/flutter events reported; and
- Among adverse events of special interest for BTK inhibitors, bleeding was observed in nine patients (34.6%), hypertension was observed in five patients (19.2%), Grade 3 or 4 cytopenias were observed in four patients (15.4%), Grade 3 or 4 infections were observed in three patients (11.5%), and secondary malignancy in three patients (11.5%). Two patients had major hemorrhage (7.7%).
“Zanubrutinib is a highly potent and selective BTK inhibitor with good bioavailability that was generally well-tolerated in this exploratory cohort from the Phase 3 ASPEN trial, said
Summary of Updated Clinical Results From the Global Phase 1/2 Trial
Abstract Number PF481
This global, open-label Phase 1/2 trial (clinicaltrials.gov identifier: NCT02343120) of zanubrutinib as monotherapy in patients with B-cell malignancies, including a cohort of patients with WM, is being conducted in
- The ORR by independent review committee (IRC) was 92% (67/73) including MRR of 82% (60/73) and CR / VGPR rate of 42% (31/73).
- The estimated PFS rate at 12 and 24 months was 90% and 81%, respectively;
- Zanubrutinib tolerability was generally consistent with previous reports in patients with various B-cell malignancies and AEs were predominantly grade 1 or 2 in severity. The most frequent AEs were upper respiratory tract infection (46%), contusion (30%), cough (20%), headache (18%) and diarrhea (17%);
- Grade 3-4 AEs occurred in 51.9% of patients. Grade 3-4 AEs of any attribution reported in > 3 patients included neutropenia (10%); anemia (7.8%), basal cell carcinoma (5%) and hypertension (5%); and
- With a median follow up 24 months, discontinuation due to AEs occurred in 10.4% of patients, with five fatal events.
“As we continue to follow the Phase 1/2 trial of zanubrutinib, now for more than four years, we are impressed by the tolerability and efficacy of this BTK inhibitor for patients with WM who had not received prior BTK inhibition therapy,” said
Pooled Analysis of Safety Data from Monotherapy Studies of Zanubrutinib in B-cell Malignancies
Abstract Number PS1159
Safety results from six ongoing, Phase 1 and Phase 2 clinical trials of zanubrutinib monotherapy, including collectively 682 patients with non-Hodgkin’s lymphoma (
This analysis included an evaluation of the frequency and severity of AEs, AEs of Special Interest (AESIs), and AEs leading to death, dose reduction or treatment discontinuation (d/c).
Ninety-seven percent of patients reported at least one AE, which were primarily grade 1 or 2. The most common AEs of all grades included upper respiratory tract infection (32.4%), neutrophil count decreased (25.2%), diarrhea (19.4%), cough (19.1%), contusion (18.6%), and rash (18%). The most common grade ≥3 AEs included neutrophil count decreased (14.4%), anemia (7.6%), neutropenia (6.6%), pneumonia (4.5%), platelet count decreased (4.3%), and lung infection (4.1%). Serious AEs (SAEs) consisting primarily of infectious complications such as pneumonia/lung infection were reported in 36% of patients.
AESIs such as atrial fibrillation/flutter (1.9%), major hemorrhage (2.5%), and grade ≥3 hypertension (3.4%) were infrequent, and treatment discontinuation due to AEs was uncommon (9.1% overall, including 3.5% for whom the event(s) were treatment-related).
“Zanubrutinib was generally well-tolerated, with less than five percent discontinuation for treatment-related adverse events. These data also demonstrated low safety-related treatment failure rates at doses of zanubrutinib associated with complete and sustained BTK inhibition,” commented
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Zanubrutinib (BGB-3111) is an investigational small molecule inhibitor of Bruton’s tyrosine kinase (BTK) discovered by
Clinical trials of zanubrutinib include a fully-enrolled, global Phase 3 clinical trial in patients with Waldenström macroglobulinemia (WM) comparing zanubrutinib to ibrutinib, currently the only approved BTK inhibitor for WM; a global Phase 3 clinical trial in patients with previously untreated chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL); a pivotal Phase 2 trial in patients with relapsed/refractory (R/R) follicular lymphoma in combination with GAZYVA® (obinutuzumab); a Phase 3 trial comparing zanubrutinib to ibrutinib in patients with R/R CLL/SLL; and a global Phase 1 trial. In China,
Zanubrutinib has been granted by the
This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other federal securities laws, including statements regarding the encouraging clinical data from clinical trials of zanubrutinib and BeiGene’s advancement of, and anticipated clinical development, regulatory milestones and commercialization of zanubrutinib. Actual results may differ materially from those indicated in the forward-looking statements as a result of various important factors, including
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