Sanofi-aventis announces TEMSO phase III study results for relapsing multiple sclerosis

Sanofi-aventis (EURONEXT: SAN and NYSE: SNY) announced today the results from the two year phase III TEMSO study of teriflunomide, a novel oral disease modifier investigated for the treatment of relapsing multiple sclerosis (RMS). In this study, both doses of teriflunomide (7 and 14mg) significantly reduced annualized relapse rate (primary study endpoint) by 31% vs. placebo (p is less than or equal to 0.0005). The risk of disability progression (sustained for 12 weeks) was also significantly reduced by 30% for the 14mg dose>

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"We are very pleased with the successful results of the TEMSO study which are an important step forward in multiple sclerosis clinical research," said Marc Cluzel, M.D., Ph.D., Executive Vice President, Research & Development, sanofi-aventis. "These exciting results with teriflunomide represent a new real hope to delivering an oral therapy to patients who live with this serious condition and are eager for new treatment options, and more convenient product forms in-line with our sanofi-aventis commitment to multiple sclerosis."

The results of the TEMSO trial are the first study findings from a large phase III clinical development program on teriflunomide. These results were presented today during the European Committee for Treatment and Research in Multiple Sclerosis (ECTRIMS) congress, in Gothenburg, Sweden.

"Multiple sclerosis is a complex disease, and it often has an unpredictable and highly disabling disease course, therefore leading to important health care needs in this relatively young patient group ", said Dr. Paul O'Connor, Director of the MS Clinic at St Michael's Hospital, Toronto, Canada and principal investigator of the TEMSO study. "We were very satisfied to see how TEMSO demonstrated that teriflunomide successfully reduced relapse rate but also reduced the time to disability progression for the highest dose with a favorable safety profile for multiple sclerosis patients with relapses and emerges as a potential new first-line treatment option in this patient population."

Teriflunomide also significantly reduced the brain disease activity on a range of magnetic resonance imaging (MRI) measures including a significant reduction of the burden of disease (total lesion volume), by 39%>

Teriflunomide was well tolerated with no major safety concerns. Adverse events occurring at a higher rate in the teriflunomide groups were diarrhea, nausea, alanine transferase increases that were mainly mild and asymptomatic with no dose effect and mild hair thinning and hair loss which rarely led to treatment discontinuation. No serious opportunistic infections occurred in patients treated with teriflunomide.

In addition to the TEMSO results, data on long-term safety of RMS patients, from eight years of follow-up of the open-label extension of a phase II study were also presented at the ECTRIMS congress. These data showed that teriflunomide was well tolerated during eight years of continuous use with a safety profile consistent with that reported during the first 36 double-blind phase weeks of the study.