Biogen Idec Announces Conclusion of Arbitration with Genentech

CAMBRIDGE, Mass.--(Business Wire)--
Biogen Idec (Nasdaq: BIIB) today announced that an arbitration panel has issued
its decision concerning the Company`s collaboration agreement with Genentech,
Inc., reaffirming Biogen Idec`s contractual right to fully participate in
strategic decisions regarding the development of RITUXAN® (rituximab) and other
anti-CD20 antibodies subject to the collaboration.

Specifically, the arbitration panel ruled that a Joint Development Committee
(JDC) comprised of three members from each company must unanimously approve a
development plan for each specific indication. Based on that finding, the panel
also ruled that, absent unanimous approval of the JDC, Genentech may not proceed
with further development of 2H7v16 in neuromyelitis optica, 2H7v16 in
relapsing-remitting multiple sclerosis (RRMS), or 2H7v114 for oncology.
Genentech may continue clinical trials for 2H7 in rheumatoid arthritis and
lupus.

"We are pleased the arbitration panel upheld our reading of the contract and
affirmed our joint decision-making rights," said James C. Mullen, Biogen Idec`s
President and CEO. "Our partnership with Genentech has been extraordinarily
successful, and we look forward to continuing to work with them to help patients
in a wide range of diseases."

The arbitration panel rejected Genentech`s assertion that the November 2003
merger of IDEC Pharmaceuticals Corp. and Biogen Inc. constituted a change of
control.

Biogen Idec co-promotes RITUXAN, a treatment for certain B-cell non-Hodgkin`s
lymphomas and rheumatoid arthritis, with Genentech in the United States. Biogen
Idec entered into the collaboration with Genentech in March 1995. Biogen Idec
filed its Demand for Arbitration in June 2006.

About Biogen Idec

Biogen Idec creates new standards of care in therapeutic areas with high unmet
medical needs. Founded in 1978, Biogen Idec is a global leader in the discovery,
development, manufacturing, and commercialization of innovative therapies.
Patients in more than 90 countries benefit from Biogen Idec's significant
products that address diseases such as lymphoma, multiple sclerosis and
rheumatoid arthritis. For product labeling, press releases and additional
information about the company, please visit www.biogenidec.com.

Biogen Idec Media Contact:
Jennifer Neiman, 617-914-6524
Senior Manager, Public Affairs
or
Biogen Idec Investor Relations Contact:
Eric Hoffman, 617-679-2812
Director, Investor Relations

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