Biomarker analysis of the ASPEN study comparing zanubrutinib with ibrutinib for patients with Waldenström macroglobulinemia

  • Constantine S Tam
  • , Stephen Opat
  • , Shirley P D'Sa
  • , Wojciech Jurczak
  • , Hui-Peng Lee
  • , Gavin Cull
  • , Roger G Owen
  • , Paula Marlton
  • , Björn E Wahlin
  • , Ramon Garcia-Sanz
  • , Helen McCarthy
  • , Stephen P Mulligan
  • , Alessandra Tedeschi
  • , Jorge J Castillo
  • , Jaroslaw Czyz
  • , Carlos Fernández de Larrea
  • , David Belada
  • , Edward N Libby
  • , Jeffrey V Matous
  • , Marina Motta
  • Tanya Siddiqi, Monica Tani, Marek Trněný, Monique C Minnema, Christian Buske, Véronique Leblond, Steven P Treon, Judith Trotman, Binghao Wu, Yiling Yu, Zhirong Shen, Wai Y Chan, Jingjing Schneider, Heather Allewelt, Aileen Cohen, Meletios-Athanasios A Dimopoulos

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Abstract

The phase 3 ASPEN trial (NCT03053440) compared Bruton tyrosine kinase inhibitors (BTKis), zanubrutinib and ibrutinib, in patients with Waldenström macroglobulinemia (WM). Post-hoc biomarker analysis was performed using next-generation sequencing on pretreatment bone marrow samples from 98 patients treated with zanubrutinib and 92 patients treated with ibrutinib with mutated (MUT) MYD88 and 20 patients with wild-type (WT) MYD88 treated with zanubrutinib. Of 329 mutations in 52 genes, mutations in CXCR4 (25.7%), TP53 (24.8%), ARID1A (15.7%), and TERT (9.0%) were most common. TP53MUT, ARID1AMUT, and TERTMUTwere associated with higher rates of CXCR4MUT(P < .05). Patients with CXCR4MUT(frameshift or nonsense [NS] mutations) had lower very good partial response (VGPR) and complete response rates (CR; 17.0% vs 37.2%, P = .020) and longer time to response (11.1 vs 8.4 months) than patients with CXCR4WTtreated with BTKis. CXCR4NSwas associated with inferior progression-free survival (PFS; hazard ratio [HR], 3.39; P = .017) in patients treated with ibrutinib but not in those treated with zanubrutinib (HR, 0.67; P = .598), but VGPR + CR rates were similar between treatment groups (14.3% vs 15.4%). Compared with ibrutinib, patients with CXCR4NStreated with zanubrutinib had a favorable major response rate (MRR; 85.7% vs 53.8%; P = .09) and PFS (HR, 0.30; P = .093). In patients with TP53MUT, significantly lower MRRs were observed for patients treated with ibrutinib (63.6% vs 85.7%; P = .04) but not for those treated with zanubrutinib (80.8% vs 81.9%; P = .978). In TP53MUT, compared with ibrutinib, patients treated with zanubrutinib had higher VGPR and CR (34.6% vs 13.6%; P < .05), numerically improved MRR (80.8% vs 63.6%; P = .11), and longer PFS (not reached vs 44.2 months; HR, 0.66; P = .37). Collectively, patients with WM with CXCR4MUTor TP53MUThad worse prognosis compared with patients with WT alleles, and zanubrutinib led to better clinical outcomes.

Original languageEnglish
Pages (from-to)1639-1650
Number of pages12
JournalBlood Advances
Volume8
Issue number7
Early online date5 Feb 2024
DOIs
Publication statusPublished - 9 Apr 2024

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