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Jaglowski, Samantha M.; Jones, Jeffrey A.; Nagar, Veena; Flynn, Joseph M.; Andritsos, Leslie A.; Maddocks, Kami J.; Woyach, Jennifer A.; Blum, Kristie A.; Grever, Michael R.; Smucker, Kelly; Ruppert, Amy S.; Heerema, Nyla A.; Lozanski, Gerard; Stefanos, Mona; Munneke, Brian; West, Jamie-Sue; Neuenburg, Jutta K.; James, Danelle F.; Hall, Nathan; Johnson, Amy J.; Byrd, John C.
Blood, 08/2015, Volume: 126, Issue: 7Journal Article
Ibrutinib represents a therapeutic advance in chronic lymphocytic leukemia (CLL) but as monotherapy produces few complete remissions in previously treated patients. Anti-CD20 antibodies have improved response and progression-free survival (PFS) when combined with chemotherapy. We evaluated the safety and activity of adding ofatumumab to ibrutinib in 3 different administration sequences. Patients with CLL/small lymphocytic lymphoma (SLL), prolymphocytic leukemia, or Richter's transformation who failed ≥2 prior therapies were enrolled. Patients received ibrutinib 420 mg daily and 12 doses of ofatumumab 300/2000 mg in 3 schedules: ibrutinib lead-in (group 1; n = 27), concurrent start (group 2; n = 20), or ofatumumab lead-in (group 3; n = 24). Seventy-one patients were treated; most had high-risk disease including del(17)(p13.1) (44%) or del(11)(q22.3) (31%). The most frequent adverse events (any grade) were diarrhea (70%), infusion-related reaction (45%), and peripheral sensory neuropathy (44%). Overall response rates in CLL/SLL patients (n = 66) were 100%, 79%, and 71% in groups 1, 2, and 3, respectively. Estimated 12-month PFSs for all patients were 89%, 85%, and 75%, respectively. Four patients in group 3 progressed prior to receiving ibrutinib. This study demonstrates the tolerability and clinical activity of this combination with quicker time to best response than single-agent ibrutinib and with durable responses. This trial was registered at www.clinicaltrials.gov as #NCT01217749. •Ibrutinib combined with ofatumumab in relapsed CLL had had an ORR of 83% with median time to response of <3 months in all groups.•All 3 sequences of administration were acceptably tolerated and active; responses were durable, and median PFS was not yet reached.
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