Genzyme’s Alemtuzumab for Multiple Sclerosis Shows Durable Treatment Benefit in Review of Four-Year Phase 2 Trial Data

Company’s CARE-MS II Phase 3 Trial Completes Enrollment

15-Sep-2009 - USA

Genzyme Corporation reported today that four-year follow-up data from its completed Phase 2 multiple sclerosis (MS) trial continued to show durable reductions in relapse rate and sustained accumulation of disability three years after the majority of patients received their last course of the investigational compound alemtuzumab. The CAMMS223 Phase 2 trial compared alemtuzumab to an approved MS therapy Rebif® (interferon beta-1a) in early, relapsing-remitting multiple sclerosis (RRMS) patients who had received no prior therapy. The accumulated four-year efficacy and safety data from the Phase 2 trial was presented in Germany at the European Committee for Treatment and Research in Multiple Sclerosis (ECTRIMS) annual meeting. Three-year CAMMS223 trial data were reported in the New England Journal of medicine (NEJM) last October.

“These longer-term Phase 2 data showed durable reductions in the occurrence of relapses and the accumulation of disability, extending for several years after patients’ last treatment,” said Alasdair Coles, MD, Senior Lecturer, Department of Clinical Neurosciences, University of Cambridge, a lead investigator of the Phase 2 clinical trial. “These findings confirm the extended duration of response observed in our pilot studies with alemtuzumab in patients with relapsing MS.”

In the trial, alemtuzumab was given to patients in two or three annual cycles of not more than five days per cycle, while Rebif was given to patients three-times per week, every week for three years.

The four-year analysis of early RRMS patients from the CAMMS223 trial found that patients taking once-yearly cycles of alemtuzumab reduced their risk of relapse by 72 percent and the risk of sustained accumulation of disability by 73 percent compared to patients treated with the active comparator Rebif. These data closely mirror the three-year findings reported in the NEJM manuscript. Further, the annualized relapse rate and disability risk measured from year three to four remained at the same low level observed in prior years of the study.

The additional review data were obtained from patients participating in CAMMS223 beyond the initial three-year study period. The dataset analyzed consists of the originally-planned three years of patient follow-up, additional continuous post-three-year follow-up, and follow-up of patients who initially discontinued but returned to the study to participate in the risk management program. Approximately 15 percent of patients participating in the post-three-year follow-up used non-study MS disease modifying therapies. A sensitivity analysis that censored these patients found that the risk of relapse and sustained accumulation of disability similarly favored alemtuzumab.

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