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We report results of a randomized, phase III study of ofatumumab versus physicians' choice treatment in patients with bulky fludarabine-refractory chronic lymphocytic leukemia and explore extended versus standard-length ofatumumab treatment. Patients (79 ofatumumab, 43 physicians' choice) completed a median 6 (ofatumumab) or 3 (physicians' choice) months' therapy. Ofatumumab-treated patients with stable disease or better were randomized (2:1) to 6 months' extended ofatumumab treatment or observation. Although the study did not meet the primary endpoint of progression-free survival (PFS) by independent review committee (ofatumumab: 5.4 months, physicians' choice: 3.6 months; p = 0.27), median PFS by investigators was significantly longer for ofatumumab versus physicians' choice (7.0 versus 4.5 months; p = 0.003) as was time to next therapy (median 11.5 versus 6.5 months; p = 0.0004). PFS and time to next therapy were significantly longer with ofatumumab extended treatment than observation (p = 0.026 and p = 0.002, respectively; n = 37). The adverse-event profile of long-term ofatumumab administration showed no unexpected findings ( identifier: NCT01313689).

Original publication




Journal article


Leuk Lymphoma

Publication Date





2037 - 2046


Anti-CD20 monoclonal antibody, chronic lymphocytic leukemia, extended-length therapy, ofatumumab, phase III clinical trial, Adult, Aged, Aged, 80 and over, Antibodies, Monoclonal, Antineoplastic Combined Chemotherapy Protocols, Drug Resistance, Neoplasm, Female, Humans, Leukemia, Lymphocytic, Chronic, B-Cell, Male, Middle Aged, Treatment Outcome, Vidarabine