Macugen approved for the treatment of neovascular (wet) age-related macular degeneration (AMD)

Eyetech Pharmaceuticals and Pfizer have announced that the U.S. Food and Drug Administration (FDA) approved Macugen (pegaptanib sodium injection) for the treatment of neovascular (wet) age-related macular degeneration (AMD), an eye disease associated with aging that destroys central vision.

AMD is the leading cause of irreversible severe vision loss in patients older than 50 years of age in developed countries. Macugen helps preserve vision and helps limit progression to legal blindness. Approval of Macugen follows a priority review under the FDA's rolling submission-Pilot 1 program based on data from the companies' Phase 2/3 pivotal clinical trials.

Macugen is the first in a new class of ophthalmic drugs to specifically target vascular endothelial growth factor (VEGF), a protein which acts as a signal in triggering the abnormal blood vessel growth and leakage that is the hallmark of neovascular AMD.

"Macugen is the first anti-angiogenic treatment approved in ophthalmology and represents the beginning of a new era. The anti-angiogenic approach specifically addresses, for the first time, an underlying cause of blindness in age-related macular degeneration. Anti-angiogenesis has evolved from theory to therapy," said Judah Folkman, M.D., Julia Andrus Dyckman Professor of Pediatric Surgery at Children's Hospital in Boston and Harvard Medical School.

Macugen meets a major urgent unmet medical need and is the first therapy indicated for the treatment of all types of neovascular AMD, regardless of lesion subtype or size. Until now, the only FDA-approved treatment was limited to the predominantly classic subtype of neovascular AMD, which accounts for up to 25 percent of the neovascular AMD patient population.

"Macugen is a revolutionary, breakthrough treatment for neovascular age-related macular degeneration as it targets the pathologic processes underlying the disease," said Donald J. D'Amico, M.D., Professor of Ophthalmology, Harvard Medical School. "Preserving vision will make a significant difference to AMD patients, since AMD can severely compromise a patient's ability to function independently. Neovascular AMD can lead to a rapid loss of central vision that impairs activities such as recognizing faces, reading, driving a car, crossing streets and basic tasks. As loss of vision progresses, patients often need help performing basic activities of daily living."

There are 15 million people in the United States living with some form of AMD, with more than 1.6 million experiencing the active blood vessel growth and blood vessel leakage associated with neovascular AMD. There are over 200,000 new cases of neovascular AMD each year and this number is expected to increase significantly as the baby boom generation ages and overall life expectancy increases. Presently, over 500,000 people worldwide lose their sight annually from the disease.

"The FDA's approval of Macugen for all neovascular age-related macular degeneration represents an important paradigm shift in the treatment of this devastating disease. Macugen is a novel treatment based on elegant science that for the first time targets the underlying cause of the disease, which has lead to our broad AMD label, including all subtypes and sizes," said David R. Guyer, M.D., Chief Executive Officer and Co-founder of Eyetech Pharmaceuticals, Inc.

Karen Katen, Pfizer's president of global pharmaceuticals, said, "Macugen represents a significant milestone in Pfizer's ongoing commitment to develop innovative ophthalmologic treatments for people whose quality of life and independence may be threatened by debilitating vision loss."

Macugen is a pegylated anti-VEGF aptamer, a single strand of nucleic acid that binds with specificity to a particular target. Macugen specifically binds to VEGF 165, a protein that plays a critical role in angiogenesis (the formation of new blood vessels) and increased permeability (leakage from blood vessels), two of the primary pathological processes responsible for the vision loss associated with neovascular AMD.

Macugen is administered in a 0.3 mg dose once every six weeks by intravitreal injection. Eyetech and Pfizer plan to make the treatment available in the first quarter of 2005.

Eyetech and Pfizer are partnering to develop and market Macugen. With the approval of Macugen, Pfizer will pay Eyetech a $90 million license fee payment. In addition, Pfizer will make an additional investment of $15 million in Eyetech's common stock within 35 business days.

The FDA approval was based on findings from two pivotal Phase 2/3 randomized, multicenter, double-masked clinical trials involving approximately 1,200 patients with all subtypes of neovascular AMD. The primary efficacy endpoint was the proportion of patients protected from three line loss of visual acuity on the eye chart by week 54. Results showed that among patients receiving 0.3 mg of Macugen, 70 percent lost less than three lines of vision on the eye chart, compared with 55 percent of patients receiving control treatment (P<.0001). The results demonstrated a 27 percent relative treatment effect for Macugen treated patients compared to controls with respect to three line loss. Macugen also helped limit progression to legal blindness, by 50 percent compared to controls, in the study eye. Two-year clinical data from the studies demonstrated a continued treatment benefit with Macugen.

Overall, Macugen was well-tolerated and the patients who entered the second year on the same therapy received over 90% of possible treatments over the two years of the study. This indicates strong compliance and acceptance to therapy. Most of the adverse events reported over the two years were mild in severity, transient and attributed by investigators to the injection procedure rather than the study drug.


The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of News Medical.
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