CAMBRIDGE, Mass.--(BUSINESS WIRE)--Biogen Idec (Nasdaq:BIIB) today announced that it has initiated a randomized, controlled, registration trial of an investigational anti-CD23 monoclonal antibody, lumiliximab, for patients with chronic lymphocytic leukemia (CLL). The trial will compare treatment with lumiliximab in combination with fludaribine, cyclophosphamide and rituximab (FCR), an emerging standard of care, to FCR alone in patients with CLL that has relapsed or failed to respond to initial therapy.