Phase 2 Data Show Daclizumab Significantly Reduced Multiple Sclerosis Lesions in Patients Receiving Interferon Be... (or of the Unit of ClinicalNeuroimmunolog...)

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Phase 2 Data Show Daclizumab Significantly Reduced Multiple Sclerosis Lesions in Patients Receiving Interferon Beta Therapy

Date:10/11/2007

or of the Unit of Clinical Neuroimmunology at the Hospital Val D'Hebron in Barcelona, Spain. "In addition, we were encouraged to see a trend in the reduction of the number of relapses, or exacerbations, that these MS patients experienced. Further study is warranted."

Daclizumab is a humanized monoclonal antibody that targets the IL-2 receptor on activated T cells. Biogen Idec and PDL plan to initiate the SELECT study, a Phase 2 trial of daclizumab alone in the same relapsing patient population, by the end of 2007.

"We are very pleased to see positive results from the CHOICE study, the first randomized trial of daclizumab in patients with relapsing MS," said Mark A. McCamish, M.D., Ph.D., chief medical officer, PDL BioPharma. "We recognize how monoclonal antibodies have changed modern medicine and see great potential in their ability to treat serious diseases, including cancer and select immunological diseases such as MS. We're very excited to move development of daclizumab forward with our partner Biogen Idec, the acknowledged leader in the MS field."

"Daclizumab represents an exciting opportunity within our growing MS portfolio," said Alfred Sandrock, M.D., Ph.D., senior vice president, neurology research and development, Biogen Idec. "MS is a complex disease that requires an arsenal of treatment options for patients. We look forward to advancing the daclizumab development program and initiating the SELECT trial by the end of the year."

Study Results

The CHOICE trial is evaluating the efficacy and safety of daclizumab or placebo added to interferon beta therapy in 230 patients with active MS who were enrolled at study centers in the U.S. and Europe. Patients were randomized to receive daclizumab 2 mg/kg every two weeks, daclizumab 1 mg/kg every four weeks, or placebo added to ongoing interferon beta treatment.

The primary efficacy analysis showed that at 24 weeks, the 75 patients in the 2 mg/kg group experienced 72% fewer new or
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Phase 2 Data Show Daclizumab Significantly Reduced Multiple Sclerosis Lesions in Patients Receiving Interferon Be...(or of the Unit of ClinicalNeuroimmunolog...)