Genzyme and Isis Begin Second Phase 3 Trial of Mipomersen

Broad New Patent Granted

Cambridge, MA, USA | August 6, 2008 | Genzyme Corp. (Nasdaq: GENZ) and Isis Pharmaceuticals, Inc. (Nasdaq: ISIS) today announced that they have begun a phase 3 study of mipomersen in patients with heterozygous familial hypercholesterolemia (heFH), a genetic disorder that causes exceptionally high levels of LDL cholesterol. It is the first of four new trials the companies plan to initiate by the end of this year, and the second late-stage study of mipomersen, a novel lipid-lowering drug that utilizes antisense technology.

The companies also announced that the United States Patent and Trademark Office granted the patent entitled “Antisense Modulation of Apolipoprotein B (apoB) Expression,” U.S. Patent No. 7,407,943. The patent broadly covers the use of antisense compounds targeting the apoB messenger RNA except a ribozyme.

"We are making excellent progress in implementing our comprehensive development plan for mipomersen," stated John P. Butler, president of Genzyme's renal, endocrine and cardiovascular business units. "The start of the heFH study puts us on track to meet our goal of beginning four new mipomersen studies this year. In addition, the recent patent issuance increases the overall value of mipomersen, which we believe has enormous potential to help patients."

The new trial will evaluate the safety and efficacy of mipomersen in patients who have heFH and coronary artery disease. It is a randomized, double-blind, placebo-controlled study taking place at approximately 30 sites in the U.S. and Canada, with an anticipated total enrollment of around 100 patients. Patients on a stable dose of other lipid-lowering agents are being randomized 2:1 to receive a 200 mg dose of mipomersen or placebo weekly for 26 weeks. The primary endpoint will be percent reduction in LDL cholesterol, and data are expected to be available in 2010. The trial will add to the body of clinical data on mipomersen and the overall product profile.

"This is an exciting moment for mipomersen, combining the initiation of the phase 3 trial in heFH with a very broad patent allowance that expands the patent coverage for the apoB franchise," said Stanley Crooke, chairman and chief executive officer of Isis. "This comprehensive patent covers methods of inhibiting apoB by targeting anywhere on the messenger RNA including the site to which mipomersen binds, and all therapeutic uses that might result from lowering apoB."

Mipomersen Development Plan

The initial indication sought for mipomersen will be for patients with homozygous FH, and enrollment in a phase 3 trial in this patient population is expected to be completed by the end of this year. Data are expected to be available in mid-2009 and a U.S. filing for this indication is anticipated during the second half of 2010.

Genzyme and Isis plan to begin three additional trials evaluating mipomersen's safety and efficacy in reducing LDL cholesterol in high-risk patients during the second half of 2008. These trials will include: one for apheresis-eligible patients, and two for high-risk, high cholesterol patients. All three have anticipated trial designs that include a 2:1 randomization ratio of a 200 mg dose of mipomersen or placebo weekly for 26 weeks.

These trials will continue to build the body of clinical evidence around mipomersen's value in managing very high risk patients. Data from the trials will also inform the design of the morbidity and mortality outcome study for potential expansion of mipomersen's label to include a broader group of at-risk, high cholesterol patients on maximally tolerated, currently available therapies.

Following the finalization in June of the mipomersen license and collaboration agreement between Genzyme and Isis, the mipomersen IND and all regulatory authority has been transferred to Genzyme. Now that this transition has taken place, the companies are looking forward to Genzyme beginning discussions with the FDA and regulatory authorities in Europe, where the development path for mipomersen may differ from that in the U.S.

New Patent

The patent entitled “Antisense Modulation of Apolipoprotein B (apoB) Expression,” U.S. Patent No. 7,407,943 is the first allowance in a series of broad filings protecting the therapeutic use of targeting apoB for the lowering of all atherogenic lipids, including LDL cholesterol and triglycerides. The patent covers the use of both single-stranded and double-stranded (siRNA) antisense drugs complementary to any site of the mRNA of human apoB regardless of their chemistry or antisense mechanism of action. The allowance provides broad protection of the Isis-Genzyme apoB franchise, including mipomersen and potential future follow-on compounds.

About Mipomersen

Mipomersen is a second-generation antisense drug currently in phase 3 development that reduces the production of apoB-100, a protein critical to the synthesis and transport of "bad" cholesterol.

In phase 2 studies, mipomersen, a weekly injectable therapeutic, was observed to reduce cholesterol and other atherogenic lipids beyond reductions achieved with standard lipid-lowering drugs, enabling more patients to achieve LDL-C targets. In 2008 Genzyme and Isis completed a licensing agreement that provides Genzyme with exclusive worldwide rights to mipomersen, which was discovered and initially developed by Isis.

About Genzyme

One of the world's leading biotechnology companies, Genzyme is dedicated to making a major positive impact on the lives of people with serious diseases. Since 1981, the company has grown from a small start-up to a diversified enterprise with more than 10,000 employees in locations spanning the globe and 2007 revenues of $3.8 billion. In 2007, Genzyme was chosen to receive the National Medal of Technology, the highest honor awarded by the President of the United States for technological innovation.

With many established products and services helping patients in nearly 90 countries, Genzyme is a leader in the effort to develop and apply the most advanced technologies in the life sciences. The company's products and services are focused on rare inherited disorders, kidney disease, orthopaedics, cancer, transplant, and diagnostic testing. Genzyme's commitment to innovation continues today with a substantial development program focused on these fields, as well as immune disease, infectious disease, and other areas of unmet medical need.

Genzyme’s press releases and other company information are available at www.genzyme.com and by calling Genzyme’s investor information line at 1-800-905-4369 within the United States or 1-678-999-4572 outside the United States.

About Isis Pharmaceuticals, Inc.

Isis is exploiting its expertise in RNA to discover and develop novel drugs for its product pipeline and for its partners. The Company has successfully commercialized the world's first antisense drug and has 18 drugs in development. Isis’ drug development programs are focused on treating cardiovascular and metabolic diseases. Isis’ partners are developing antisense drugs invented by Isis to treat a wide variety of diseases. Ibis Biosciences, Inc., Isis’ majority-owned subsidiary, is developing and commercializing the Ibis T5000™ Biosensor System, a revolutionary system to identify infectious organisms. Isis is a joint owner of Regulus Therapeutics LLC, a joint venture focused on the discovery, development and commercialization of microRNA therapeutics. As an innovator in RNA-based drug discovery and development, Isis is the owner or exclusive licensee of over 1,500 issued patents worldwide. Additional information about Isis is available at www.isispharm.com.

SOURCE: Genzyme

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