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Noy, Ariela; de Vos, Sven; Thieblemont, Catherine; Martin, Peter; Flowers, Christopher R.; Morschhauser, Franck; Collins, Graham P.; Ma, Shuo; Coleman, Morton; Peles, Shachar; Smith, Stephen; Barrientos, Jacqueline C.; Smith, Alina; Munneke, Brian; Dimery, Isaiah; Beaupre, Darrin M.; Chen, Robert
Blood, 04/2017, Volume: 129, Issue: 16Journal Article
Marginal zone lymphoma (MZL) is a heterogeneous B-cell malignancy for which no standard treatment exists. MZL is frequently linked to chronic infection, which may induce B-cell receptor (BCR) signaling, resulting in aberrant B-cell survival and proliferation. We conducted a multicenter, open-label, phase 2 study to evaluate the efficacy and safety of ibrutinib in previously treated MZL. Patients with histologically confirmed MZL of all subtypes who received ≥1 prior therapy with an anti-CD20 antibody–containing regimen were treated with 560 mg ibrutinib orally once daily until progression or unacceptable toxicity. The primary end point was independent review committee–assessed overall response rate (ORR) by 2007 International Working Group criteria. Among 63 enrolled patients, median age was 66 years (range, 30-92). Median number of prior systemic therapies was 2 (range, 1-9), and 63% received ≥1 prior chemoimmunotherapy. In 60 evaluable patients, ORR was 48% (95% confidence interval CI, 35-62). With median follow-up of 19.4 months, median duration of response was not reached (95% CI, 16.7 to not estimable), and median progression-free survival was 14.2 months (95% CI, 8.3 to not estimable). Grade ≥3 adverse events (AEs; >5%) included anemia, pneumonia, and fatigue. Serious AEs of any grade occurred in 44%, with grade 3-4 pneumonia being the most common (8%). Rates of discontinuation and dose reductions due to AEs were 17% and 10%, respectively. Single-agent ibrutinib induced durable responses with a favorable benefit–risk profile in patients with previously treated MZL, confirming the role of BCR signaling in this malignancy. As the only approved therapy, ibrutinib provides a treatment option without chemotherapy for MZL. This study is registered at www.clinicaltrials.gov as #NCT01980628. •Single-agent ibrutinib induced durable remissions (ORR 48%) with a favorable benefit–risk profile in patients with previously treated MZL.•Inhibition of BCR signaling with ibrutinib provides a treatment option without chemotherapy for an MZL population with high unmet need.
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