April 10, 2003

Neurochem's Data Safety Monitoring Board recommends continuation of pivotal phase II/III clinical trial for Fibrillex™.
Second Unanimous Recommendation from Data Safety Monitoring Board.

- Neurochem, Inc. (TSX: NRM) - A specialty pharmaceutical company focused on disorders of the central nervous system and amyloid-related diseases, announced today that, following the second meeting of its independent Data Safety Monitoring Board (DSMB), the Company has received a unanimous recommendation to continue its pivotal Phase II/III clinical trial for Fibrillex™ for the treatment of the orphan disease secondary AA amyloidosis, a disorder associated with chronic infection or chronic inflammatory diseases. This second recommendation by the DSMB members was based on their recent review of the safety data from 59 patients who have completed at least four months of the Phase II/III clinical study.

"Fibrillex™ is the first drug candidate of its class to be undergoing human clinical trials for secondary AA amyloidosis, for which there are no specific treatments currently available," said Denis Garceau, Ph.D., Vice President, Drug Development of Neurochem. "Secondary AA amyloidosis manifests itself when insoluble amyloid fibrils deposit in tissues and organs, impairing their function. Fibrillex™ is expected to inhibit the fibril formation and promote the clearance of these proteins from the tissues."

Philippe Calais, Pharm. D., President of Neurochem said, "This recommendation represents solid and steady progress of our lead drug candidate, Fibrillex™, toward commercialization. Fibrillex™ is indeed the most advanced drug candidate in clinical testing of Neurochem's new class of therapeutics. Accordingly, we are pleased with the safety profile obtained in patients up to this point. The Company is also pursuing two other innovative clinical programs in Phase II clinical trials for Alzhemed™, for the treatment of Alzheimer's disease and Cerebril™ for the treatment of hemorrhagic stroke due to cerebral amyloid angiopathy."

The DSMB first convened in August 2002, which also resulted in a unanimous recommendation for Neurochem to continue its pivotal Phase II/III trial for Fibrillex™. The DSMB is comprised of independent medical experts and was established by Neurochem as part of the Company's compliance with good clinical practices guidelines. The DSMB is responsible for monitoring the safety of patients participating in the Phase II/III clinical trial and for reviewing the safety data throughout its duration.

About Fibrillex™

The pivotal Phase II/III clinical trial for Fibrillex™ is a two-year, international, multicenter, randomized, double-blind, placebo-controlled, and parallel-designed trial to evaluate the safety and efficacy of Fibrillex™ in patients suffering from secondary AA amyloidosis. Neurochem has successfully completed the enrollment of more than the 150 patients required for this pivotal Phase II/III trial, which is being conducted at 27 sites located across North America, Europe and Israel. This trial is planned to end in January 2005.

Fibrillex™ is an oral drug candidate for the treatment of secondary AA amyloidosis through the prevention of amyloid fibril formation. It has received orphan drug status in the United States and Europe. Fibrillex™ belongs to the class of glycosaminoglycan (GAG) mimetics which competes with natural GAGs for the same binding sites on the Amyloid A (AA) protein. By preventing natural GAGs from binding to the AA protein, Fibrillex™ is expected to prevent AA fibril formation and the deposition of AA fibrils in organs.

About Secondary AA Amyloidosis

Secondary AA amyloidosis is associated with chronic inflammatory diseases (e.g., rheumatoid arthritis, ankylosing spondylitis, inflammatory bowel diseases), chronic infections (e.g., osteomyelitis, tuberculosis) and Familial Mediterranean Fever. The most common clinical presentation of secondary AA amyloidosis is kidney malfunction. Involvement of the gastrointestinal system is also frequent and is usually manifested as chronic diarrhea, gastrointestinal bleeding, abdominal pain and malabsorption. Enlargement of the liver and the spleen may also occur in some patients. Secondary AA amyloidosis has a poor prognosis with five- to 15-year survival rates of 50% and 25%, respectively. End-stage renal failure is the cause of death in 40% to 60% of cases. There is currently no therapy for the direct treatment of secondary amyloidosis.

About Neurochem

Neurochem is a product-driven, specialty pharmaceutical company which offers a new class of drug candidates to prevent and stop the progression of diseases for which no cure exists. The Company's strong and growing pipeline will meet unmet medical needs and is focused on disorders of the central nervous system and amyloid-related diseases. Neurochem's most advanced product candidate is Fibrillex™, in pivotal Phase II/III clinical development for the treatment of Secondary Amyloidosis, a fatal kidney disease. Two other product candidates in Phase II clinical development are Alzhemed™ for the treatment of Alzheimer's disease and Cerebril™ for Hemorrhagic Stroke due to Cerebral Amyloid Angiopathy. At the pre-clinical development stage, the Company has two potential products targeting Diabetes Type 2 and Epileptic Seizures induced by traumatic brain injury (www.neurochem.com).

All of the statements contained in this news release, other than statements of fact which are independently verifiable at the date hereof, are forward-looking statements. Such statements, based as they are on the current expectations of management, inherently involve numerous risks and uncertainties, known and unknown. Some examples of known risks are: the impact of general economic conditions, general conditions in the pharmaceutical industry, changes in the regulatory environment in the jurisdictions in which Neurochem does business, stock market volatility, fluctuations in costs, and changes to the competitive environment due to consolidation or otherwise. Consequently, actual future results may differ materially from the anticipated results expressed in the forward-looking statements.

For further Information, please contact:
Dr. Lise Hébert
Vice President, Corporate Communications
lhebert@neurochem.com

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Laval (Quebec)
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Tel: (450) 680-4500
Fax: (450) 680-4501

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