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Zanubrutinib for the treatment of MYD88 wild-type Waldenström macroglobulinemia: a substudy of the phase 3 ASPEN trial

M. Dimopoulos, RG. Sanz, HP. Lee, M. Trneny, M. Varettoni, S. Opat, S. D'Sa, RG. Owen, G. Cull, S. Mulligan, J. Czyz, JJ. Castillo, M. Motta, T. Siddiqi, M. Gironella Mesa, M. Granell Gorrochategui, D. Talaulikar, PL. Zinzani, E. Askari, S....

. 2020 ; 4 (23) : 6009-6018. [pub] 20201208

Language English Country United States

Document type Journal Article, Research Support, Non-U.S. Gov't

Patients with Waldenström macroglobulinemia (WM) lacking activating mutations in the MYD88 gene (MYD88WT) have demonstrated relatively poor outcomes to ibrutinib monotherapy, with no major responses reported in a phase 2 pivotal study. Zanubrutinib is a novel, selective Bruton tyrosine kinase (BTK) inhibitor designed to maximize BTK occupancy and minimize off-target activity. The ASPEN study consisted of a randomized comparison of zanubrutinib and ibrutinib efficacy and safety in patients with WM who have the MYD88 mutation, as well as a separate cohort of patients without MYD88 mutation (MYD88WT) or with unknown mutational status who received zanubrutinib. Results from the latter single-arm cohort are reported herein. Efficacy endpoints included overall, major and complete (CR) or very good partial response (VGPR) rates, progression-free survival (PFS), duration of response (DOR), and overall survival (OS). Twenty-eight patients (23 relapsed/refractory; 5 treatment-naïve) were enrolled, including 26 with centrally confirmed MYD88WT disease and 2 with unknown MYD88 mutational status. At a median follow-up of 17.9 months, 7 of 26 MYD88WT patients (27%) had achieved a VGPR and 50% a major response (partial response or better); there were no CRs. At 18 months, the estimated PFS and OS rates were 68% and 88%, respectively, while the median DOR had not been reached. Two patients discontinued zanubrutinib due to adverse events. Treatment-emergent hypertension, atrial fibrillation, and major hemorrhages were reported in 3, 1 and 2 patients (including 1 concurrent with enoxaparin therapy), respectively. Results of this substudy demonstrate that zanubrutinib monotherapy can induce high quality responses in patients with MYD88WT WM. This trial is registered on www.clinicaltrials.gov as NCT #03053440.

1st Department of Medicine Faculty of Medicine 1 Charles University General Hospital Prague Czech Republic

AO Spedali Civili di Brescia Lombardia Italy

ASST Grande Ospedale Metropolitano Niguarda Milan Italy

Azienda Ospedaliero Universitaria di Bologna Bologna Italy

BeiGene Co Ltd Beijing China

BeiGene Switzerland GmbH Basel Switzerland

BeiGene USA Inc San Mateo CA

Bing Center for Waldenström Macroglobulinemia Dana Farber Cancer Institute Boston MA

City of Hope National Medical Center Duarte CA

Clinical Hematology Department Sorbonne University Pitié Salpêtrière Hospital Paris France

Comprehensive Cancer Center Ulm Universitätsklinikum Ulm Baden Württemberg Germany

Concord Repatriation General Hospital Department of Haematology University of Sydney Concord NSW Australia

Concord Repatriation General Hospital Sydney Concord NSW Australia

Department of Clinical Therapeutics National and Kapodistrian University of Athens Athens Greece

Department of Haematology Flinders Medical Centre Adelaide SA Australia

Department of Hematology and Cancer Prevention Health Sciences Faculty Medical University of Silesia Katowice Poland

Department of Hematology Collegium Medicum in Bydgoszcz Nicolaus Copernicus University in Toruń Bydgoszcz Poland

Department of Hematology School of Clinical Sciences Monash University Clayton VIC Australia

Faculty of Medicine Dentistry and Health Sciences University of Melbourne Parkville VIC Australia

Fondazione Istituto di Ricovero e Cura a Carattere Scientifico Policlinico San Matteo Pavia Italy

Hospital de La Santa Creu i Sant Pau Barcelona Spain

Hospital Universitario de Salamanca Salamanca Spain

Hospital Universitario Fundación Jiménez Díaz Madrid Spain

Hospital Universitario Vall d'Hebrón Barcelona Spain

Institut Català d'Oncologia Hospital Universitari Germans Trias i Pujol Barcelona Spain

Istituto di Ematologia Seràgnoli Dipartimento di Medicina Specialistica Diagnostica e Sperimentale Università degli Studi Bologna Italy

Medical Oncology Harvard Medical School Boston MA

Monash Health and

Pathology and Laboratory Medicine University of Western Australia Perth WA Australia

Peter MacCallum Cancer Centre Melbourne VIC Australia

Plymouth Hospitals National Health Service Trust Derriford Hospital Devon United Kingdom

Royal Melbourne Hospital Parkville VIC Australia

Royal North Shore Hospital Sydney NSW Australia

Sir Charles Gairdner Hospital Perth WA Australia

St James University Hospital Leeds United Kingdom

St Vincent's Hospital Fitzroy VIC Australia

Szpital Uniwersytecki nr 2 Dr Jana Biziela Kujawsko pomorskie Bydgoszcz Poland

The John Curtin School of Medical Research Australian National University Canberra ACT Australia

University College London Hospital Foundation Trust London United Kingdom

Uniwersytecki Szpital Kliniczny w Bialymstoku Podlaskie Poland

References provided by Crossref.org

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