Testing of the anti-CD20 monoclonal antibody in elderly patients with lymphocytic leukaemia (median age 69 years) in a phase III clinical trial has demonstrated that treatment with ofatumumab plus chlorambucil compared with chlorambucil alone results in significantly improved progression-free survival (median 22.4 months versus 13.1 months; P <0.001). More adverse events were detected in the ofatumumab plus chlorambucil group (50% versus 43%). Results suggest this regimen is effective in elderly patients.