Celltech Group plc: US Food and Drug Administration Approves Zavesca -- First Oral Treatment Option for Type 1 Gaucher Disease

Slough, Berkshire, UNITED KINGDOM

SLOUGH, U.K., August 1, 2003 (PRIMEZONE) -- Celltech Group plc (LSE:CCH) (NYSE:CLL) and Actelion Ltd (SWX:ATLN) today announced that the US Food and Drug Administration (FDA) has approved Zavesca(R) (miglustat) capsules, the first oral treatment option for type 1 Gaucher disease.

Type 1 Gaucher disease is a rare genetic lipid storage disorder affecting an estimated 10,000 individuals worldwide. It is a progressive condition that is caused by a deficiency of glucocerbrosidase, an important enzyme in the metabolism of key lipids in the body. The deficiency of this enzyme results in accumulation of excess amounts of glycosphingolipids (GSLs) in specific cells primarily in the liver, spleen and bone marrow. Such accumulation leads to liver and spleen enlargement/dysfunction, anaemia, bone disease and pain.

Current therapy includes enzyme replacement therapy (ERT), which is delivered via an intravenous infusion twice monthly.

Zavesca(R) is the first in a new class of drugs known as substrate reduction therapy (SRT), which reduces the amount of glycosphingolipid (GSL) production to a level which can effectively cleared by the naturally occurring glucocerbrosidase in the cells. Zavesca(R) will be available to patients in the United States later this year.

Zavesca(R) Indication in the US

The FDA has approved Zavesca(R) for the treatment of adult patients with mild to moderate type 1 Gaucher disease for whom enzyme replacement therapy is not a therapeutic option (e.g. due to constraints such as allergy, hypersensitivity, or poor venous access). Woman who are or may become pregnant should not take Zavesca(R).

Zavesca(R) is approved in the European Union and is commercially available in the United Kingdom and Germany.

Background on Actelion and Zavesca(R)

Actelion is the license holder for Zavesca(R) worldwide, with the exception of Israel where the drug is also approved. Actelion is responsible for all regulatory and marketing activities and will book all sales of Zavesca(R). The drug was originally developed by Oxford GlycoSciences (OGS), now part of the Celltech Group.

Actelion and Celltech to further develop Zavesca(R)

Through a joint steering committee, Actelion and Celltech are currently conducting clinical studies with Zavesca(R) for the treatment of other lipid storage disorders, such as type 3 Gaucher disease, Niemann-Pick type C, and Late Onset Tay-Sachs.

Celltech Group plc (LSE:CCH) (NYSE:CLL) is one of Europe's largest biotechnology companies, with an extensive development pipeline and a profitable, cash-generative pharmaceutical business. Celltech also possesses drug discovery capabilities of exceptional strength, including a leading position in antibody engineering. More details can be found at www.celltechgroup.com

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