Tysabri info presented at AAN

A board to discuss the newly-released drug Tysabri, (formerly known as Antegren) as a treatment for Multiple Sclerosis

Tysabri info presented at AAN

Postby bromley » Thu May 03, 2007 7:05 am

Data Presented at the American Academy of Neurology's Annual Meeting Provide Update on Utilisation and Safety of TYSABRI(R) in Patients with Multiple Sclerosis 03 May 2007

Additional Data From Extension Study Presented Show TYSABRI Benefit is Sustained Over Three Years.

Biogen Idec and Elan Corporation, plc announced today that new data from the TOUCH Prescribing Program(TM) and TYGRIS safety study confirm the safety profile from previous clinical studies of TYSABRI(R) (natalizumab). Also presented at the 59th annual meeting of the American Academy of Neurology in Boston, MA were extension study data that showed that TYSABRI has a sustained treatment effect on clinical relapses and the risk of disability progression in multiple sclerosis (MS) patients treated for up to three years. The companies recently reported that as of mid-April 2007 approximately 12,500 patients have been prescribed TYSABRI worldwide. The companies estimate that in both commercial use and clinical trials, there are currently over 10,000 patients on TYSABRI therapy worldwide.

"The findings from the safety update combined with the data showing the sustained effect of TYSABRI in patients treated for up to three years, contribute to our evolving understanding of the utilisation of this therapy as an important treatment option for people living with the debilitating effects of MS," said Paul O'Connor, MD, St. Michael's Hospital, Toronto, Ontario, Canada, lead investigator of the TYSABRI extension study.

TYSABRI Update

TYSABRI is available in the US through the TOUCH Prescribing Program. All prescribers, infusion sites and patients receiving TYSABRI are required to enroll in TOUCH. Safety information is also collected through ongoing clinical trials and registries, including STRATA, TYGRIS and the pregnancy registry. According to data available to the companies as of April 23, 2007, there have been no new reports of confirmed cases of progressive multifocal leukoencephalopathy (PML) or other serious opportunistic infections (OIs). The data confirm the safety profile from previous clinical studies of TYSABRI and will continue to expand the knowledge of the long-term safety and tolerability of TYSABRI.

The combination of TOUCH, TYGRIS and the pregnancy registry will be the largest long-term follow-up undertaken for an MS therapy, and the companies plan to continue to provide similar updates at upcoming medical meetings.

The companies recently announced that as of mid-April, approximately 12,500 patients have been prescribed TYSABRI worldwide. In both commercial use and clinical trials, there are currently over 10,000 patients on TYSABRI therapy worldwide.

In the US, approximately 6,600 patients are on TYSABRI therapy commercially. Approximately 10,000 patients have enrolled in the TOUCH program and 1,500 physicians have enrolled patients.
In the EU, approximately 2,500 patients internationally have received TYSABRI infusions commercially, mostly in Germany and the Nordic countries.
In clinical trial settings, over 1,000 patients are on TYSABRI therapy
TYSABRI Efficacy Sustained through Three Years.

Patients who participated in the Phase III TYSABRI program were eligible to enroll in an open-label extension study that evaluated the therapy's long-term effects. Included in this were patients from AFFIRM, a randomised, double-blind, placebo-controlled, two-year monotherapy study of TYSABRI that enrolled 942 patients (627 patients on TYSABRI, 315 on placebo). In AFFIRM, TYSABRI reduced the annualised relapse rate in patients with MS by 67% (p(less than)0.001) and the risk of 12-week sustained disability progression by 42% (p(less than)0.001) compared with placebo. In the intent to treat analysis, the annualised relapse rate for patients treated with TYSABRI over the three-year period was 0.23, translating into an average of one relapse every 4.3 years. The relapse rate also continued to remain low over the three-year treatment period with TYSABRI: 0.27 during the first year; 0.20 during the second year; and 0.15 during the third year (based on 531 patients who entered the extension study, which includes approximately 250 patients with nearly three years of continuous therapy).

In addition, TYSABRI also decreased the cumulative probability of disability progression sustained for six months compared to placebo. The estimated proportion of patients who had 24-week sustained disability progression at two years was 11% in patients treated with TYSABRI compared to 23% in patients treated with placebo, a 54% relative reduction.

This effect was maintained in patients treated with TYSABRI for up to three years with 13% showing 24-week sustained disability progression.

About TOUCH and TYGRIS

Before initiating treatment, all US patients, prescribers and infusion sites must be enrolled in the TOUCH Prescribing Program (TYSABRI Outreach: Unified Commitment to Health). TOUCH is designed to determine the incidence of and risk factors for serious OIs, including PML, and to monitor patients for signs and symptoms of PML while promoting informed benefit/risk discussions prior to initiating TYSABRI treatment. Physicians report on PML, serious OIs, deaths and discontinuation of therapy on an ongoing basis.

TYGRIS (TYSABRI Global ObseRvation Program In Safety) is expected enroll 5,000 patients worldwide, including approximately 3,000 patients from TOUCH. Patients in TYGRIS are evaluated at baseline and every six months thereafter for five years. Researchers will evaluate data including medical/MS history; prior TYSABRI use; prior use of immunomodulatory, antineoplastic, or immunosuppressive agents; and all serious adverse events, including PML and other serious OIs, and malignancies.

About TYSABRI

In the US, TYSABRI is approved as a monotherapy treatment for relapsing forms of MS. TYSABRI increases the risk of PML, an opportunistic viral infection of the brain that usually leads to death or severe disability. Patients should be monitored at regular intervals for any new or worsening signs or symptoms suggestive of PML. Because of the increased risk of PML, TYSABRI is generally recommended for patients who have had an inadequate response to, or are unable to tolerate, alternate MS therapies. It is available in the US only through a restricted distribution program called the TOUCH Prescribing Program. According to product labeling, after two years, TYSABRI treatment led to a 67% relative reduction (p(less than)0.001) in the annualised relapse rate compared to placebo and reduced the relative risk of disability progression by 42% (p(less than)0.001). TYSABRI treatment also resulted in sustained and statistically significant reductions in brain lesion activity as measured by MRI. Changes in MRI findings often do not correlate with changes in the clinical status of patients (e.g., disability progression). The prognostic significance of the MRI findings in these studies has not been evaluated.

In the European Union, TYSABRI is indicated as a single disease-modifying therapy in highly active relapsing-remitting MS patients. Because of the increased risk of PML, it is for patients with high disease activity despite treatment with a beta-interferon or in patients with rapidly evolving severe relapsing-remitting MS.

According to product labeling in the EU, after two years, TYSABRI treatment led to a 68% relative reduction (p(less than)0.001) in the annualised relapse rate compared to placebo and reduced the relative risk of disability progression by 42-54% (p(less than)0.001).

Source: Biogen Idec and Elan Corporation, plc
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