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BIOGEN IDEC AND SWEDISH ORPHAN BIOVITRUM RECEIVE OPINION FROM EMA ON PEDIATRIC PLAN FOR LONG-LASTING HEMOPHILIA B THERAPY

FOR IMMEDIATE RELEASE
Weston, Mass. and Stockholm, Sweden  - May 9, 2011 - Biogen Idec (NASDAQ: BIIB)
and Swedish Orphan Biovitrum (STO: SOBI) today announced that the European
Medicines Agency's (EMA) Pediatric Committee (PDCO) has adopted an opinion
agreeing to the pediatric investigational plan for the companies' long-lasting,
fully-recombinant Factor IX Fc fusion protein (rFIXFc).

In accordance with the PDCO's opinion, Biogen Idec and Swedish Orphan Biovitrum
plan to initiate a global pediatric trial in previously-treated patients under
12 years of age as soon as sufficient data are available from a study of older
patients. Under draft guidelines published by the EMA for the development of
Factor IX products, pediatric data from this trial will be required in the
initial submission of a Marketing Authorization Application to the European
regulatory agency.

"The EMA's agreement to our pediatric investigational plan is another milestone
in our effort to develop innovative therapies for people with hemophilia," said
Glenn Pierce, M.D., Ph.D., Senior Vice President of Hemophilia at Biogen Idec.
"With this opinion and the ongoing Phase 3 trials of our long-lasting Factor IX
and Factor VIII programs, we continue to make progress toward our goal of
improving the way hemophilia is treated worldwide."

"The opinion from the EMA's Pediatric Committee is valuable for our promising
rFIXFc project, as it allows for the development of rFIXFc in the pediatric
population. We are excited about the potential of this innovative product to
make a difference in the lives of people with hemophilia," said Peter Edman,
Ph.D., Chief Scientific Officer of Swedish Orphan Biovitrum.

About rFIXFc and the recombinant Fc Fusion protein hemophilia program
rFIXFc is a recombinant Factor IX Fc fusion protein developed using monomeric Fc
fusion technology. The technology makes use of a natural mechanism that recycles
rFIXFc in the circulation to extend its half-life. It is a fully-recombinant
clotting factor designed to replace the protein that hemophilia B patients lack
and to last longer in the body than commercially-available Factor IX products.
rFIXFc is currently being evaluated in a registrational, open-label, multicenter
trial (B-LONG) designed to evaluate its safety, pharmacokinetics and efficacy in
hemophilia B patients.

Using the same proprietary monomeric Fc fusion technology as rFIXFc, Biogen Idec
and Swedish Orphan Biovitrum are also developing a fully-recombinant, long-
lasting Factor VIII Fc fusion protein (rFVIIIFc) for the treatment of hemophilia
A. rFVIIIFc is currently being evaluated in a registrational, open-label,
multicenter trial (A-LONG) designed to evaluate its safety, pharmacokinetics and
efficacy in hemophilia A patients. For more information on the rFIXFc and
rFVIIIFc trials, please visit www.biogenidechemophilia.com or
www.clinicaltrials.gov.

About Hemophilia B
Hemophilia B is a rare, inherited disorder in which the ability of a person's
blood to clot is impaired. Hemophilia B occurs in about one in 25,000 male
births annually and is caused by having substantially reduced or no Factor IX
protein, which is needed for normal blood clotting. People with hemophilia B
therefore need injections of Factor IX to restore the coagulation process and
prevent frequent bleeds that could otherwise lead to pain, irreversible joint
damage and life-threatening hemorrhages. Prophylactic treatment with infusions
twice per week to maintain a sufficient circulating level of coagulation factor
is being increasingly used, and long-term studies demonstrate that such regimens
increase the patient's life expectancy and greatly reduce, if not eliminate,
progressive joint deterioration.

About Biogen Idec
Biogen Idec uses cutting-edge science to discover, develop, manufacture and
market therapies for serious diseases with a focus on neurology, immunology and
hemophilia. Founded in 1978, Biogen Idec is the world's oldest independent
biotechnology company. Patients worldwide benefit from its leading multiple
sclerosis therapies, and the company generates more than $4 billion in annual
revenues. For product labeling, press releases and additional information about
the company, please visitwww.biogenidec.com.

About Swedish Orphan Biovitrum (Sobi)
Sobi is a Swedish-based niche specialty pharmaceutical company with an
international market presence. The company is focused on providing and
developing specialist pharmaceuticals for rare disease patients with high
medical needs. The portfolio consists of about 60 marketed products and an
emerging late-stage clinical development pipeline. Our focus areas are:
hemophilia, inflammation/autoimmune diseases, fat malabsorption, cancer and
inherited metabolic disorders. Sobi had pro-forma revenues 2009e of about 2 BSEK
and approximately 500 employees. The head office is located in Sweden and the
share (STO: SOBI) is listed on NASDAQ OMX Stockholm. For more information please
visitwww.sobi.com.

Safe Harbor
This press release contains forward-looking statements, including statements
about the development of long-lasting hemophilia therapies. These statements may
be identified by words such as "believe," "expect," "may," "plan," "will" and
similar expressions, and are based on the companies' current beliefs and
expectation. Drug development involves a high degree of risk. Factors which
could cause actual results to differ materially from the companies' current
expectations include the risk that we may not fully enroll our planned clinical
trials, unexpected concerns may arise from additional data or analysis,
regulatory authorities may require additional information, further studies, or
may fail to approve the drug, or the companies may encounter other unexpected
hurdles. For more detailed information on the risks and uncertainties associated
with Biogen Idec's drug development and other activities, see the periodic
reports of Biogen Idec filed with the Securities and Exchange Commission. Any
forward-looking statements speak only as of the date of this press release and
the companies assume no obligation to update any forward-looking statements,
whether as a result of new information, future events or otherwise.

For more information please contact:


Biogen Idec Media Contact:              Swedish Orphan Biovitrum:
Tracy Vineis                            Peter Edman, CSO
Senior Manager, Public Affairs          Phone: +46 8 629 21 77
+1 (781) 464-3260                       [email protected]

Biogen Idec Investor Relations Contact:
Kia Khaleghpour
Associate Director, Investor Relations
+1 (781) 464-2442






Swedish Orphan Biovitrum may be required to disclose the information provided
herein pursuant to the Swedish Securities Markets Act. The information was
provided for public release on May 9, 2011, 11:15 a.m. CET.


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